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University of New South Wales
1.
Woods, Michael Richard.
Modelling and perception for autonomous ground vehicles in non-uniform terrain.
Degree: Mechanical & Manufacturing Engineering, 2015, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/55692 
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:38554/SOURCE02?view=true
► Autonomous Ground Vehicles (AGVs) are increasingly being used in more complex, harsh and remote environments because of their ability to replace a human driver, removing…
(more)
▼ Autonomous Ground Vehicles (AGVs) are increasingly being used in more complex, harsh and remote environments because of their ability to replace a human driver, removing them from danger. However, the environments that are being targeted for the application of AGVs frequently occur in areas that have unstructured, uneven and non-uniform terrain. Safe and accurate navigation through such environments requires reliable terrain perception methods capable of identifying friction characteristics and an accurate system
model, both are required in order to reduce the system uncertainties. Currently, methods for reducing these uncertainties are not well established.This thesis researched the sources of uncertainty that an AGV is
subject to whilst moving through an unstructured and non-uniform terrain. A number of key sources of uncertainty were identified, with changes in terrain type and thus the coefficient of friction being one key component, as well as the dynamic behaviour of the
tyre interacting with the terrain, especially during cornering maneuvers.Furthermore, it develops a novel terrain perception method which utilises purely non-semantic spatial information. The Extended Range Texture Analysis (ERTA) method is capable of providing an accurate terrain
model that accounts for the identified terrain frictional and geometric characteristics, which reduces the uncertainties in terrain frictional characteristics that exists in the system
model. The ERTA method can provide a solution for classifying the terrain types in an environment even in the absence of visual or semantic spatial features in a scene.Two novel
tyre models were also developed in this thesis: a simplified Friction Dependant
tyre model, and a 3D Analytical Dynamic
tyre model. The purpose of developing these models is to enable the incorporation of the sources of uncertainties, including both frictional characteristics provided by the terrain
model and
tyre dynamic effects. The simulation results of both the developed
tyre models were compared against the widely accepted experimentally derived Magic Formula
tyre model.Following on from this research, control system designers can incorporate the developed
tyre models and perception method to reduce the uncertainties in the system parameters and disturbances to design significantly improved controllers.
Advisors/Committee Members: Katupitiya, Jayantha, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW, Guivant, Jose, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Friction Dependent Tyre Model; Ground Vehicles; Tyre Model; Terrain Perception; Texture Perception; Dynamic Vehicle Model
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APA (6th Edition):
Woods, M. R. (2015). Modelling and perception for autonomous ground vehicles in non-uniform terrain. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/55692 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:38554/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Woods, Michael Richard. “Modelling and perception for autonomous ground vehicles in non-uniform terrain.” 2015. Doctoral Dissertation, University of New South Wales. Accessed March 02, 2021.
http://handle.unsw.edu.au/1959.4/55692 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:38554/SOURCE02?view=true.
MLA Handbook (7th Edition):
Woods, Michael Richard. “Modelling and perception for autonomous ground vehicles in non-uniform terrain.” 2015. Web. 02 Mar 2021.
Vancouver:
Woods MR. Modelling and perception for autonomous ground vehicles in non-uniform terrain. [Internet] [Doctoral dissertation]. University of New South Wales; 2015. [cited 2021 Mar 02].
Available from: http://handle.unsw.edu.au/1959.4/55692 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:38554/SOURCE02?view=true.
Council of Science Editors:
Woods MR. Modelling and perception for autonomous ground vehicles in non-uniform terrain. [Doctoral Dissertation]. University of New South Wales; 2015. Available from: http://handle.unsw.edu.au/1959.4/55692 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:38554/SOURCE02?view=true
Brno University of Technology
2.
Jeřábek, Miroslav.
Modely a charakteristiky pneumatik: Tire models and characteristics.
Degree: 2019, Brno University of Technology
URL: http://hdl.handle.net/11012/6228
This bachelor work map tire model story and evolution. With raising transport requirements was necessity start charakteristic tires watch with a view to their lasting amelioration. With entrance CT were improvement mathematical computational or were newly creation.
Advisors/Committee Members: Laurinec, Marián (advisor), Ambróz, Richard (referee).Subjects/Keywords: Pneumatika; charakteristika; matematické výpočtové modely; vlastnosti pneumatik; MKP - model; Magic Formula; SWIFT - model.; Tyre; characteristics; mathematical computational models; tyre properties; FEM – model; Magic Formula tyre model; SWIFT tyre model.
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APA (6th Edition):
Jeřábek, M. (2019). Modely a charakteristiky pneumatik: Tire models and characteristics. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/6228
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jeřábek, Miroslav. “Modely a charakteristiky pneumatik: Tire models and characteristics.” 2019. Thesis, Brno University of Technology. Accessed March 02, 2021.
http://hdl.handle.net/11012/6228.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jeřábek, Miroslav. “Modely a charakteristiky pneumatik: Tire models and characteristics.” 2019. Web. 02 Mar 2021.
Vancouver:
Jeřábek M. Modely a charakteristiky pneumatik: Tire models and characteristics. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/11012/6228.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jeřábek M. Modely a charakteristiky pneumatik: Tire models and characteristics. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/6228
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
3.
Vroom, Quinn (author).
POMDP based online parameter estimation for autonomous passenger vehicles: Researching online tyre parameter estimation performance by improving the trajectory using a POMDP algorithm.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:192fdf22-0c21-49f4-9413-211276871008
► The internal model is an important piece of the control system of an autonomous driving vehicle. In order for the model to deliver accurate predictions,…
(more)
▼ The internal
model is an important piece of the control system of an autonomous driving vehicle. In order for the
model to deliver accurate predictions, a valid
model structure and well chosen parameters are needed.
Model parameters can be highly fluctuating or complex to predict, especially when looking into
tyre ground surface interaction models. Instead of predicting parameter values beforehand, they could be estimated and updated in real-time. Fluctuation or incorrectness can be adjusted while driving. However, this uncertainty in parameter value must be accounted for when applying control. Solving this problem by regarding the uncertainty in parameters of the internal vehicle
model as a POMDP has been researched in this paper. The research question being: is it worthwhile to use the POMDP approach for online parameter estimation of autonomous passenger vehicles? To answer this multiple sub-questions have been composed. We start off looking into: what is the most suitable vehicle
model? Different vehicle models and
tyre models were compared. Literature showed the bicycle
model in combination with the linearized
tyre model to be most suitable for autonomous passenger vehicles. The next question is: What is the most promising algorithm? Using literature, suitable algorithms for solving this POMDP have been found and compared. From three compelling algorithms, the one best fitting the autonomous driving criteria was chosen. Knowing the
model and the algorithm for the simulation the next question became: Does the algorithm perform on a vehicle
model? To answer this question, the simulation has been implemented in MATLAB and performance has been tested. The results showed significant increase in parameter estimation performance. Within 2 timesteps the estimate had converged correctly. The next question is: Does the algorithm perform within realistic bounds? To answer this question, the same simulation as before has been used, but now with saturation on the steering input. This showed parameter estimation performance increase compared to the original trajectory, but not as overwhelming as without saturation. The next question is: Does the algorithm suffer from high noise? To answer this question, the same simulation has been used, but now with different levels of noise. The results showed parameter estimation performance significantly affected by increasing noise. The final sub-question is: Does the algorithm suit increasing
model complexity? To answer this question, the amount of parameters have been increased in the simulation and there has been looked into the large matrices that accompany the algorithm. Results showed that increasing the complexity has a significant effect on the size of the simulation and algorithm matrices. In conclusion, from all of these experiments arose some very interesting results. This produced a useful insight into the strengths and weaknesses of the POMDP algorithm performing on a passenger vehicle, answering the research question. This also led to various recommendations for future…
Advisors/Committee Members: Wisse, Martijn (mentor), Spaan, Matthijs (graduation committee), Zhou, Hongpeng (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: POMDP; parameter estimation; online; tyre model
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APA (6th Edition):
Vroom, Q. (. (2019). POMDP based online parameter estimation for autonomous passenger vehicles: Researching online tyre parameter estimation performance by improving the trajectory using a POMDP algorithm. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:192fdf22-0c21-49f4-9413-211276871008
Chicago Manual of Style (16th Edition):
Vroom, Quinn (author). “POMDP based online parameter estimation for autonomous passenger vehicles: Researching online tyre parameter estimation performance by improving the trajectory using a POMDP algorithm.” 2019. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:192fdf22-0c21-49f4-9413-211276871008.
MLA Handbook (7th Edition):
Vroom, Quinn (author). “POMDP based online parameter estimation for autonomous passenger vehicles: Researching online tyre parameter estimation performance by improving the trajectory using a POMDP algorithm.” 2019. Web. 02 Mar 2021.
Vancouver:
Vroom Q(. POMDP based online parameter estimation for autonomous passenger vehicles: Researching online tyre parameter estimation performance by improving the trajectory using a POMDP algorithm. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:192fdf22-0c21-49f4-9413-211276871008.
Council of Science Editors:
Vroom Q(. POMDP based online parameter estimation for autonomous passenger vehicles: Researching online tyre parameter estimation performance by improving the trajectory using a POMDP algorithm. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:192fdf22-0c21-49f4-9413-211276871008
KTH
4.
Wangs, Taozhi.
Analysis on Tyre Wear : Modelling and Simulations.
Degree: Vehicle Dynamics, 2017, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-271256
► The tyre is an essential part of a road vehicle. It is in the contact between road and tyre that the forces that create…
(more)
▼ The tyre is an essential part of a road vehicle. It is in the contact between road and tyre that the forces that create the possibility for the driver to control the vehicle are generated. Tyres, however, wear down, which leads to both unhealthy wear particles and disposal of old tyres, both of which are harmful to the environment. If one could learn more about what causes wear, it might be possible to reduce tyre wear, which would be beneficial from both an economic and an ecological point of view. The aim of this thesis work is to develop a tyre model that can simulate tyre wear and take temperature, pressure and vehicle settings into account. Based on tyre brush theory, a tyre wear model has been developed which includes a thermal model, a pressure model and a friction model. Simulations and analysis of different cases has been performed. From the results, one can conclude the following: the tyre temperature and inflation pressure change with the distance the vehicle travels at the beginning and later become steady; higher external temperature will decrease tyre wear rate since the inflation pressure increases with the external temperature and the sliding friction decreases; higher vehicle speed leads to a higher tyre wear rate; the tyre temperature increases with increasing vehicle speed; the amount of tyre wear increases linearly with the normal load on the tyre; the tyre wear increases with the slip ratio exponentially due to both the siding distance and the sliding friction increasing with the slip ratio; the tyre wear increases exponentially with the slip angle. The complete model can estimate the tyre wear with different vehicle settings and external factors. More experiments are needed in the future to validate the complete model. In addition, since the heat transfer coefficient is changeable with temperature, the thermal model can be improved by introducing dynamic heat transfer coefficients. The Savkoor friction model used in the report can also be improved by tuning its parameters using more experimental data.
Subjects/Keywords: Brush model; Tyre wear; Thermal model; Friction model.; Vehicle Engineering; Farkostteknik
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APA (6th Edition):
Wangs, T. (2017). Analysis on Tyre Wear : Modelling and Simulations. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-271256
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wangs, Taozhi. “Analysis on Tyre Wear : Modelling and Simulations.” 2017. Thesis, KTH. Accessed March 02, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-271256.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wangs, Taozhi. “Analysis on Tyre Wear : Modelling and Simulations.” 2017. Web. 02 Mar 2021.
Vancouver:
Wangs T. Analysis on Tyre Wear : Modelling and Simulations. [Internet] [Thesis]. KTH; 2017. [cited 2021 Mar 02].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-271256.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wangs T. Analysis on Tyre Wear : Modelling and Simulations. [Thesis]. KTH; 2017. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-271256
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
5.
Advocaat, R. (author).
Comparing and improving steering forces in a race car and race simulator to increase simulator fidelity.
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:4cb0dc14-0ca0-4296-be74-51d0fd752fc5
► As circuit testing days are expensive and limited by regulations, racing teams are more and more dependent on simulation tools. Van Amersfoort Racing built their…
(more)
▼ As circuit testing days are expensive and limited by regulations, racing teams are more and more dependent on simulation tools. Van Amersfoort Racing built their own racing simulator to train drivers in an fully controlled environment. This environment is based on commercially available simulation software rFactor. However, no research on the accuracy of the physics of this software is available. Since level of fidelity of race simulators is important for the perception of racing drivers, force feedback steering forces are analyzed. Information of the real Formula 3 car is used to upgrade the vehicle model used in rFactor and to develop a Multibody Dynamic vehicle model of the same car. Steering metrics are used to make qualitative comparisons between steering force measurement in the real car, the simulator and the Multibody Dynamic model. It is shown that the baseline simulator vehicle model is less sensitive to steering input compared to the real car. Furthermore the simulator driver theoretically senses higher steering torques for a given lateral acceleration discarding electric power limitations of the force feedback motor. As a desire to improve simulator fidelity, a Pacejka tyre model of the Hankook Formula 3 tyre is converted to an rFactor model together with an improved suspension model using the exact suspension geometry as provided by car manufacturer Dallara. Simultaneously, the Multibody Dynamic vehicle model is constructed from these submodels, which purely focusses on lateral dynamics. In order to use the lateral based Multibody Dynamic model as a tool for simulation and assessment, its response is tested given the same input as the real Formula 3 car experienced during a particular test. Three cases are considered: weaving on a straight, a low speed corner and a high speed corner. Longitudinal load transfer is inherent in low speed corners, which, due to its limitation in the Multibody Dynamic model, leaves the model adjustments inconclusive. Furthermore, tyre relaxation plays an important role in low speed corners following each other up in a short period of time, which affect low speed steering metrics. The Multibody Dynamic model showed close correlation of steering metrics with real car measurements for the high speed corner. The updated rFactor model improved steering torque feedback despite higher required steering angles.
Flight Performance & Propulsion
Aerospace Engineering
Advisors/Committee Members: Voskuijl, M. (mentor).
Subjects/Keywords: Formula 3; Multibody dynamic model; Pacejka tyre model; Suspension geometry; Simulator
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APA (6th Edition):
Advocaat, R. (. (2015). Comparing and improving steering forces in a race car and race simulator to increase simulator fidelity. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:4cb0dc14-0ca0-4296-be74-51d0fd752fc5
Chicago Manual of Style (16th Edition):
Advocaat, R (author). “Comparing and improving steering forces in a race car and race simulator to increase simulator fidelity.” 2015. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:4cb0dc14-0ca0-4296-be74-51d0fd752fc5.
MLA Handbook (7th Edition):
Advocaat, R (author). “Comparing and improving steering forces in a race car and race simulator to increase simulator fidelity.” 2015. Web. 02 Mar 2021.
Vancouver:
Advocaat R(. Comparing and improving steering forces in a race car and race simulator to increase simulator fidelity. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:4cb0dc14-0ca0-4296-be74-51d0fd752fc5.
Council of Science Editors:
Advocaat R(. Comparing and improving steering forces in a race car and race simulator to increase simulator fidelity. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:4cb0dc14-0ca0-4296-be74-51d0fd752fc5
Brno University of Technology
6.
Novodomský, Tomáš.
Měření radiální tuhosti pneumatik: Tyre Radial Stiffness Measurement.
Degree: 2020, Brno University of Technology
URL: http://hdl.handle.net/11012/192750
► This thesis deals with the radial stiffness of a tyre. The first part of is devoted to a brief description of a tyre construction. The…
(more)
▼ This thesis deals with the radial stiffness of a
tyre. The first part of is devoted to a brief description of a
tyre construction. The next part is devoted to measuring the radial stiffness of a
tyre and the design of a new measuring device. The last part of the thesis deals with the influence of the radial stiffness of a
tyre on the vertical dynamics of ta vehicle and simulations of this effect in the MATLAB / Simulink software.
Advisors/Committee Members: Hejtmánek, Petr (advisor), Vančura, Jan (referee).
Subjects/Keywords: Pneumatika; konštrukcia pneumatiky; radiálna tuhosť pneumatiky; meracie zariadenie; zvislá dynamika vozidla; výpočtový model; Tyre; tyre construction; tyre radial stiffness; measuring device; vertical vehicle dynamics; computational model
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APA ·
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APA (6th Edition):
Novodomský, T. (2020). Měření radiální tuhosti pneumatik: Tyre Radial Stiffness Measurement. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/192750
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Novodomský, Tomáš. “Měření radiální tuhosti pneumatik: Tyre Radial Stiffness Measurement.” 2020. Thesis, Brno University of Technology. Accessed March 02, 2021.
http://hdl.handle.net/11012/192750.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Novodomský, Tomáš. “Měření radiální tuhosti pneumatik: Tyre Radial Stiffness Measurement.” 2020. Web. 02 Mar 2021.
Vancouver:
Novodomský T. Měření radiální tuhosti pneumatik: Tyre Radial Stiffness Measurement. [Internet] [Thesis]. Brno University of Technology; 2020. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/11012/192750.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Novodomský T. Měření radiální tuhosti pneumatik: Tyre Radial Stiffness Measurement. [Thesis]. Brno University of Technology; 2020. Available from: http://hdl.handle.net/11012/192750
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Pretoria
7.
Stallmann, M.J. (Martin
Joachim).
Tyre model
verification over off-road terrain.
Degree: Mechanical and Aeronautical
Engineering, 2013, University of Pretoria
URL: http://hdl.handle.net/2263/41012
► Vehicle dynamic simulations form a significant part of the design and development process of vehicles. These simulations are used to study and improve the vehicle’s…
(more)
▼ Vehicle dynamic simulations form a significant part of
the design and development process of vehicles. These simulations
are used to study and improve the vehicle’s durability, ride
comfort and handling capabilities. All forces acting on the vehicle
are either generated in the
tyre-road interface or are due to
aerodynamic effects, where at low speeds the latter one can be
ignored. The accuracy of the
tyre model describing the forces on
the
tyre-road interface is thus of exceptional importance. It
ensures that the simulation
model is an accurate representation of
the actual vehicle.
Various approaches are adopted when developing
mathematical
tyre models. Many of these models are developed to
study the handling capabilities of passenger cars over a smooth
road. Passenger car tyres are the focal point as larger tyres
introduce some difficulties due to their size and load rating.
Off-road truck tyres also differ in their construction which will
influence force and moment generation of the
tyre. Research efforts
are increasing to meet the need of
tyre models that can describe
the behaviour of the
tyre over uneven terrain with sufficient
accuracy. This thesis addresses the question of whether existing
mathematical
tyre models can accurately describe the forces and
moments generated by a large off-road
tyre while driving over rough
terrain.
The complexity of different mathematical
tyre models
varies greatly, as does the parameterisation efforts required to
obtain the
model parameters. The parameterization of most
tyre
models relies on some experimental test data that is used to
extract the necessary information to fit
model parameters. The
selection of a suitable
tyre model for a simulation is often
dependent on the availability of such experimental data and the
effort to identify the required parameters. In this study the
parameterisation process for four different
tyre models, are
discussed in detail to highlight the difficulties in acquiring the
test data and the effort to parameterize the
model. The models
considered are the One Point Contact, 3D Equivalent Volume contact,
3D Enveloping Contact and FTire
model.
Experimental measurements
are conducted on a 16.00R20 Michelin XZL
tyre. Laboratory tests, as
well as field tests, over discrete obstacles and uneven hard
surfaces are used for parameterisation and validation purposes.
Simulation results are compared to experimental test data to
determine whether the models could be used to describe the
tyre
road interactions with sufficient accuracy. Recommendations are
made for
tyre model selection and
model accuracy for simulations
over rough off-road surfaces.
Advisors/Committee Members: Els, P.S. (Pieter Schalk) (advisor).
Subjects/Keywords: Tyre
model; Off-road
terrain;
Vehicles;
Ride;
Durability;
UCTD
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APA ·
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APA (6th Edition):
Stallmann, M. J. (. (2013). Tyre model
verification over off-road terrain. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/41012
Chicago Manual of Style (16th Edition):
Stallmann, M J (Martin. “Tyre model
verification over off-road terrain.” 2013. Masters Thesis, University of Pretoria. Accessed March 02, 2021.
http://hdl.handle.net/2263/41012.
MLA Handbook (7th Edition):
Stallmann, M J (Martin. “Tyre model
verification over off-road terrain.” 2013. Web. 02 Mar 2021.
Vancouver:
Stallmann MJ(. Tyre model
verification over off-road terrain. [Internet] [Masters thesis]. University of Pretoria; 2013. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/2263/41012.
Council of Science Editors:
Stallmann MJ(. Tyre model
verification over off-road terrain. [Masters Thesis]. University of Pretoria; 2013. Available from: http://hdl.handle.net/2263/41012
Loughborough University
8.
Tsotras, Achillefs.
On the interaction between modal behaviour and shear force behaviour of a pneumatic tyre.
Degree: PhD, 2010, Loughborough University
URL: http://hdl.handle.net/2134/6031
► The in-plane phenomena of interaction between the tyre structural response and contact force generation are investigated in this work. The challenges of the physical tyre…
(more)
▼ The in-plane phenomena of interaction between the tyre structural response and contact force generation are investigated in this work. The challenges of the physical tyre simulation are identified, primarily associated with the computational load imposed by the need to capture the space distributed mechanisms that prescribe the above interaction. The method of modal expansion and reduction is proposed for the moderation of this load. The theoretical framework for the transformation of a tyre modal representation into a transient contact and shear force generation model is developed. Various modelling approaches are examined with regards to their modal prediction characteristics. Linear and non linear structural features as well as the physical properties that define the broad range modal behaviour are identified. A discretised form of the ring model is derived and combined with a foundation of viscoelastic tread elements for simulating the transient contact behaviour of the tyre. The resulting pattern of the modes' excitation justifies the validity of the modal reduction method and reveals the relative importance of various mechanisms and physical properties in tyre contact behaviour. The interaction between the friction controlled shear slip of the tread, the belt compliance and the sidewall buckling is found to be reflected on the two-dimensional contact pressure distribution patterns. A method able to simulate the dynamic transient rolling and slipping operating conditions is developed, although the small displacement assumption of the modal approach is dropped. The method, which is based on the combined modal-time and space-time domain solutions, is applied on the study of the physical mechanism of the launch process. The examination of the model under steady state kinematic conditions reveals the saturation of the traction force for profound levels of slip, which highlights the contribution of the structural mechanisms on the macroscopically observed shear force performance of the tyre. The variation of the modes' level of excitation, as induced by the operating conditions, is proposed for the capture of the physical properties effect on tyre behaviour and performance.
Subjects/Keywords: 629.2; Tyre transient simulation; Ring model; Tyre modal; Tyre tread model; Tyre sidewall model
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APA (6th Edition):
Tsotras, A. (2010). On the interaction between modal behaviour and shear force behaviour of a pneumatic tyre. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/6031
Chicago Manual of Style (16th Edition):
Tsotras, Achillefs. “On the interaction between modal behaviour and shear force behaviour of a pneumatic tyre.” 2010. Doctoral Dissertation, Loughborough University. Accessed March 02, 2021.
http://hdl.handle.net/2134/6031.
MLA Handbook (7th Edition):
Tsotras, Achillefs. “On the interaction between modal behaviour and shear force behaviour of a pneumatic tyre.” 2010. Web. 02 Mar 2021.
Vancouver:
Tsotras A. On the interaction between modal behaviour and shear force behaviour of a pneumatic tyre. [Internet] [Doctoral dissertation]. Loughborough University; 2010. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/2134/6031.
Council of Science Editors:
Tsotras A. On the interaction between modal behaviour and shear force behaviour of a pneumatic tyre. [Doctoral Dissertation]. Loughborough University; 2010. Available from: http://hdl.handle.net/2134/6031
Delft University of Technology
9.
De Vries, E.J.H.
Model-Based Brake Control including Tyre Behaviour.
Degree: 2012, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:8df8176f-dd33-4678-8370-78a2c2862863
;
urn:NBN:nl:ui:24-uuid:8df8176f-dd33-4678-8370-78a2c2862863
;
urn:NBN:nl:ui:24-uuid:8df8176f-dd33-4678-8370-78a2c2862863
;
http://resolver.tudelft.nl/uuid:8df8176f-dd33-4678-8370-78a2c2862863
► The objective of the thesis is to develop a method for controlled braking of a vehicle. The brake pedal depression has been considered to be…
(more)
▼ The objective of the thesis is to develop a method for controlled braking of a vehicle. The brake pedal depression has been considered to be proportional to the intended deceleration. The brake controller is not aimed to replace a cruise control; it will have an anti-lock braking (ABS) function. The brake control is essentially designed to be a continuous control law with a continuous brake torque output suitable for using it on real world actuators. To develop the continuous control and taking into account the friction and elastic properties of the
tyre, a quarter-car
model with LuGre
tyre has been derived. Considering only a quarter car keeps the
model compact and by having 4 brake controllers each wheel can be controlled individually...
Advisors/Committee Members: Rixen, D.J., Verhaegen, M..
Subjects/Keywords: braking; tyre model; flatness; brake control
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APA ·
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APA (6th Edition):
De Vries, E. J. H. (2012). Model-Based Brake Control including Tyre Behaviour. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8df8176f-dd33-4678-8370-78a2c2862863 ; urn:NBN:nl:ui:24-uuid:8df8176f-dd33-4678-8370-78a2c2862863 ; urn:NBN:nl:ui:24-uuid:8df8176f-dd33-4678-8370-78a2c2862863 ; http://resolver.tudelft.nl/uuid:8df8176f-dd33-4678-8370-78a2c2862863
Chicago Manual of Style (16th Edition):
De Vries, E J H. “Model-Based Brake Control including Tyre Behaviour.” 2012. Doctoral Dissertation, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:8df8176f-dd33-4678-8370-78a2c2862863 ; urn:NBN:nl:ui:24-uuid:8df8176f-dd33-4678-8370-78a2c2862863 ; urn:NBN:nl:ui:24-uuid:8df8176f-dd33-4678-8370-78a2c2862863 ; http://resolver.tudelft.nl/uuid:8df8176f-dd33-4678-8370-78a2c2862863.
MLA Handbook (7th Edition):
De Vries, E J H. “Model-Based Brake Control including Tyre Behaviour.” 2012. Web. 02 Mar 2021.
Vancouver:
De Vries EJH. Model-Based Brake Control including Tyre Behaviour. [Internet] [Doctoral dissertation]. Delft University of Technology; 2012. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:8df8176f-dd33-4678-8370-78a2c2862863 ; urn:NBN:nl:ui:24-uuid:8df8176f-dd33-4678-8370-78a2c2862863 ; urn:NBN:nl:ui:24-uuid:8df8176f-dd33-4678-8370-78a2c2862863 ; http://resolver.tudelft.nl/uuid:8df8176f-dd33-4678-8370-78a2c2862863.
Council of Science Editors:
De Vries EJH. Model-Based Brake Control including Tyre Behaviour. [Doctoral Dissertation]. Delft University of Technology; 2012. Available from: http://resolver.tudelft.nl/uuid:8df8176f-dd33-4678-8370-78a2c2862863 ; urn:NBN:nl:ui:24-uuid:8df8176f-dd33-4678-8370-78a2c2862863 ; urn:NBN:nl:ui:24-uuid:8df8176f-dd33-4678-8370-78a2c2862863 ; http://resolver.tudelft.nl/uuid:8df8176f-dd33-4678-8370-78a2c2862863
North-West University
10.
Gurai, Chaitamwari.
Gasification kinetics of blends of waste tyre and typical South African coals / Chaitamwari Gurai
.
Degree: 2015, North-West University
URL: http://hdl.handle.net/10394/15278
► With increasing energy demand globally and, in particular, in South Africa coupled with depletion of the earth’s fossil energy resources and growing problem of disposal…
(more)
▼ With increasing energy demand globally and, in particular, in South Africa coupled with
depletion of the earth’s fossil energy resources and growing problem of disposal of nonbiodegradable
waste such as waste tyres, there is a need and effort globally to find alternative
energy from waste material including waste tyres. One possible way of exploiting waste tyre
for energy or chemicals recovery is through gasification for the production of syngas, and this
is what was investigated in this study. The possibility of gasification of waste tyre blended with
coal after pyrolysis was investigated and two Bituminous coals were selected for blending with
the waste tyre in co-gasification. A sample of ground waste tyre / waste tire, WT, a high vitrinite
coal from the Waterberg coalfield (GG coal) and a high inertinite coal from the Highveld
coalfield (SF coal) were used in this investigation.
The waste tyre sample had the highest volatile matter content of 63.8%, followed by GG coal
with 27% and SF coal with 23.8%. SF coal had the highest ash content of 21.6%, GG coal had
12.6% and waste tyre had the lowest of 6.6%. For the chars, SF char still had the highest ash
of 24.8%, but WT char had higher ash, 14.7%, when compared to GG char with 13.9% ash.
The vitrinite content in GG coal was 86.3%, whilst in SF coal it was 25% and SF coal had a
higher inertinite content of 71% when compared to GG coal with 7.7%. SF char had the highest
BET surface area of 126m2/g, followed by GG char with 113m2/g, and WT had the lowest
value of 35.09m2/g. The alkali indices of the SF, WT and GG chars were calculated to be 8.2,
4.2 and 1.7 respectively.
Coal samples were prepared by crushing and milling to particle sizes less than 75μm before
charring in a packed bed balance reactor at temperatures up to 1000 °C.Waste tyre samples were
charred at the same conditions before milling to < 75μm particle size. Coal and WT chars were
blended in ratios of 75:25, 50:50 and 25:75 before gasification experimentation. Carbon
dioxide gasification was conducted on the blends and the pure coal and WT chars in a
Thermogravimetric analyser (TGA) at 900 °C, 925 °C, 950 °C and 975 °C and ambient pressure.
100% CO2 was used at a flow rate of 2L/min.
Reactivity of the pure char samples was found to be in the order SF > GG > WT, and the
relationship between the coal chars’ reactivities could be explained by the high ash content of
the SF char and low reactivity of the WT char corresponds to its low BET surface area. In
general, the coal/WT char mixtures were less reactive than the respective coal, but more
reactive than the pure WT char, the only exception being the 75% GG char blend which was
initially more reactive than the GG char, and reactivity decreased with increasing WT content.
For all samples reactivity increased with increasing temperature.
The relationship between the reactivities of the GG char and its blends and that of the SF char
and its blends was found to be affected by the amount of WT char added, especially at the
lower…
Subjects/Keywords: Waste tyre / waste tire;
Vitrinite-rich coal;
Inertinite-rich coal;
Carbon dioxide gasification;
Random pore model (RPM)
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gurai, C. (2015). Gasification kinetics of blends of waste tyre and typical South African coals / Chaitamwari Gurai
. (Thesis). North-West University. Retrieved from http://hdl.handle.net/10394/15278
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gurai, Chaitamwari. “Gasification kinetics of blends of waste tyre and typical South African coals / Chaitamwari Gurai
.” 2015. Thesis, North-West University. Accessed March 02, 2021.
http://hdl.handle.net/10394/15278.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gurai, Chaitamwari. “Gasification kinetics of blends of waste tyre and typical South African coals / Chaitamwari Gurai
.” 2015. Web. 02 Mar 2021.
Vancouver:
Gurai C. Gasification kinetics of blends of waste tyre and typical South African coals / Chaitamwari Gurai
. [Internet] [Thesis]. North-West University; 2015. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10394/15278.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gurai C. Gasification kinetics of blends of waste tyre and typical South African coals / Chaitamwari Gurai
. [Thesis]. North-West University; 2015. Available from: http://hdl.handle.net/10394/15278
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
11.
Kiébré, Rimyalegdo.
Contribution to the modelling of aircraft tyre-road interaction : Contribution à la modélisation de l'interface pneu-piste du train d'atterissage des avions.
Degree: Docteur es, Automatique et Mécanique, 2010, Mulhouse
URL: http://www.theses.fr/2010MULH4086
► La présente thèse est une partie du projet national français dénommé MACAO (Modélisation Avancée de Composants Aéronautiques et Outils associés). En collaboration avec Messier-Dowty (constructeur…
(more)
▼ La présente thèse est une partie du projet national français dénommé MACAO (Modélisation Avancée de Composants Aéronautiques et Outils associés). En collaboration avec Messier-Dowty (constructeur d'atterrisseurs d'avion), cette thèse contribue à une meilleure compréhension du comportement du pneu sur piste dans le domaine de l'aéronautique. L'objectif est de mettre en place des modèles capables de représenter le torseur des efforts au niveau de l'interface pneu-piste lors des différentes manœuvres de l'avion au sol en régime établi. Une priorité est accordée aux modèles dont les paramètres sont physiquement interprétables. De ce fait, un état de l'art des modèles de pneu en régime établi est d'abord réalisé. Un classement de ces modèles selon leurs motivations et limitations est aussi proposé. A l'aide de cette classification et en prenant en compte les exigences de l'étude, un choix a priori de modèles a été analysé. Les limites de ces modèles sont soulignées et une amélioration est proposée. Par ailleurs, une étude exhaustive de la déformation du pneu en situation de virage a été menée. Elle a permis de décrire la génération de la composante longitudinale de la force totale au niveau de l'interface pneu-piste. Elle est dite force longitudinale induite. Puis, en prenant en compte cette force, il a été possible d'expliquer pourquoi le moment d'auto-alignement peut repasser par zéro sans que le pneu ne soit en glissement total. Enfin, l'analyse de sensibilité est proposée comme une méthode permettant de déterminer les paramètres les plus influents de chaque modèle. Ces paramètres doivent alors être déterminés avec précision afin de réduire l'incertitude sur le modèle.
This thesis is a part of the French national project called MACAO (Modélisation Avancée de Composants Aéronautiques et Outils associés). In collaboration with Messier-Dowty company (a landing gears manufacturer), the thesis has contributed to better understand the actual literature studies in the field of aircraft tyre-road interaction modelling and therefore, to help making an optimal choice of model for a specifie application. The objectives have been to propose models for representing the tyre behaviour on the ground with respect to the aircraft run types. Physical oriented models are preferred. To complete this study, a literature survey of the previous researches in tyre modelling for steadystate responses is first carried out. Then, based on the main factors playing an important role in tyre modelling, it is proposed a classification for the physical and the semi-empirical models, which are also investigated. Based on this classification, the study requirements and the measurement data constraints, an a priori choice of suitable models are studied. A further investigation of the tyre deformation at pure lateral slip is carried out. It has allowed to physically describe the mechanism of generation of the longitudinal component of the tyre force at pure lateral slip. This force is refened as induced longitudinal force. By taking this force into…
Advisors/Committee Members: Basset, Michel (thesis director).
Subjects/Keywords: Modèle de pneu pour avion; Comportement à l'équilibre; Physique; L'analyse de sensibilité; Paramètres influents; Incertitude du modèle; Aircraft tyre model; Steady-state behaviour; Physical; Sensitivity analysis; Influential parameters; Model uncertainty
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APA ·
Chicago ·
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Export
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APA (6th Edition):
Kiébré, R. (2010). Contribution to the modelling of aircraft tyre-road interaction : Contribution à la modélisation de l'interface pneu-piste du train d'atterissage des avions. (Doctoral Dissertation). Mulhouse. Retrieved from http://www.theses.fr/2010MULH4086
Chicago Manual of Style (16th Edition):
Kiébré, Rimyalegdo. “Contribution to the modelling of aircraft tyre-road interaction : Contribution à la modélisation de l'interface pneu-piste du train d'atterissage des avions.” 2010. Doctoral Dissertation, Mulhouse. Accessed March 02, 2021.
http://www.theses.fr/2010MULH4086.
MLA Handbook (7th Edition):
Kiébré, Rimyalegdo. “Contribution to the modelling of aircraft tyre-road interaction : Contribution à la modélisation de l'interface pneu-piste du train d'atterissage des avions.” 2010. Web. 02 Mar 2021.
Vancouver:
Kiébré R. Contribution to the modelling of aircraft tyre-road interaction : Contribution à la modélisation de l'interface pneu-piste du train d'atterissage des avions. [Internet] [Doctoral dissertation]. Mulhouse; 2010. [cited 2021 Mar 02].
Available from: http://www.theses.fr/2010MULH4086.
Council of Science Editors:
Kiébré R. Contribution to the modelling of aircraft tyre-road interaction : Contribution à la modélisation de l'interface pneu-piste du train d'atterissage des avions. [Doctoral Dissertation]. Mulhouse; 2010. Available from: http://www.theses.fr/2010MULH4086
12.
Hamza, Sabra.
Contribution à l'analyse de sensibilité des systèmes complexes : application à la dynamique du véhicule : Contribution to sensitivity analysis of complex systems : application to vehicle dynamics.
Degree: Docteur es, Automatique, 2015, Mulhouse
URL: http://www.theses.fr/2015MULH1599
► Le véhicule est un système dynamique complexe, composé de différents sous-systèmes de nature différente (moteur, système de freinage, suspension ...). Chaque sous-système est décrit par…
(more)
▼ Le véhicule est un système dynamique complexe, composé de différents sous-systèmes de nature différente (moteur, système de freinage, suspension ...). Chaque sous-système est décrit par un modèle mathématique dépendant d’un nombre important de paramètres, très souvent incertains (méconnaissance, manque de mesures,…). L’incertitude sur les paramètres se propage à travers le modèle et se retrouve sur la sortie. Cette dernière représente les forces et moments mis en jeu dans le véhicule. L’incertitude sur la sortie n’est pas toujours tolérable pour des raisons de sécurité, précision,…Situé dans ce contexte, les travaux de la thèse consistent à proposer des méthodes d’analyse de sensibilité permettant de déterminer les paramètres dont les incertitudes ont un effet significatif sur le comportement d’un système donné, en particulier le véhicule. Dans une première partie, le cas des modèles à paramètres dépendants et suivant une distribution arbitraire est étudié. Une méthode, basée sur la décorrélation des paramètres par la décomposition de Cholesky, a été proposée. Pour résoudre le problème de la distribution arbitraire, l’approximation par polynôme du chaos arbitraire est adoptée, en construisant une base orthonormale en termes de moments statistiques non centrés des paramètres. Les indices de sensibilité, permettant de quantifier la contribution de chaque paramètre à la variance de la sortie, sont obtenus directement à partir des coefficients des polynômes du chaos ainsi obtenus. La méthode proposée est appliquée et validée sur un modèle de pneumatique. Dans la deuxième partie, le cas des modèles dynamiques est traité. Une méthode basée sur les dérivées partielles est explorée, puis une approche alternative est proposée. Elle utilise de façon originale des outils de l’Automatique, les grammiens d’atteignabilité et d’observabilité. L’influence des paramètres sur l’énergie consommée en entrée et restituée par le système en sortie est ainsi déterminée. L’avantage de cette technique est que les paramètres peuvent être classifiés selon leurs influences sur l’énergie consommée ou restituée, tout au long de la dynamique du système. D’autre part, l’étude de la sensibilité des paramètres sur les échanges de l’énergie, permet de déterminer un placement optimal des paramètres pour une optimisation de l’énergie consommée et restituée en sortie. Les deux méthodes proposées sont appliquées et validées sur un modèle bicyclette décrivant le comportement dynamique d’un véhicule. Dans la dernière partie, des tests sur véhicule d’essais ont été réalisés sur circuit. Les différentes approches d’analyse de sensibilité ont été appliquées sur les résultats d’essais, afin de recaler des modèles de pneumatique.
The vehicle is a complex dynamic system, composed of various subsystems of different kind (engine, braking system, suspension, etc.). Each subsystem is described by a mathematical model depending on a significant number of parameters, very often uncertain (unknown, lack of measures, etc.). The uncertainty on the parameters is…
Advisors/Committee Members: Basset, Michel (thesis director).
Subjects/Keywords: Analyse de sensibilité; Polynômes du chaos; Recalage de modèle; Grammiens; Modèle véhicule; Dynamique du véhicule; Modèle de pneumatique; Sensitivity analysis; Chaos polynomial; Model adjustement; Gramians; Vehicle model; Vehicle dynamic; Tyre model; 629.22
Record Details
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APA ·
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to Zotero / EndNote / Reference
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APA (6th Edition):
Hamza, S. (2015). Contribution à l'analyse de sensibilité des systèmes complexes : application à la dynamique du véhicule : Contribution to sensitivity analysis of complex systems : application to vehicle dynamics. (Doctoral Dissertation). Mulhouse. Retrieved from http://www.theses.fr/2015MULH1599
Chicago Manual of Style (16th Edition):
Hamza, Sabra. “Contribution à l'analyse de sensibilité des systèmes complexes : application à la dynamique du véhicule : Contribution to sensitivity analysis of complex systems : application to vehicle dynamics.” 2015. Doctoral Dissertation, Mulhouse. Accessed March 02, 2021.
http://www.theses.fr/2015MULH1599.
MLA Handbook (7th Edition):
Hamza, Sabra. “Contribution à l'analyse de sensibilité des systèmes complexes : application à la dynamique du véhicule : Contribution to sensitivity analysis of complex systems : application to vehicle dynamics.” 2015. Web. 02 Mar 2021.
Vancouver:
Hamza S. Contribution à l'analyse de sensibilité des systèmes complexes : application à la dynamique du véhicule : Contribution to sensitivity analysis of complex systems : application to vehicle dynamics. [Internet] [Doctoral dissertation]. Mulhouse; 2015. [cited 2021 Mar 02].
Available from: http://www.theses.fr/2015MULH1599.
Council of Science Editors:
Hamza S. Contribution à l'analyse de sensibilité des systèmes complexes : application à la dynamique du véhicule : Contribution to sensitivity analysis of complex systems : application to vehicle dynamics. [Doctoral Dissertation]. Mulhouse; 2015. Available from: http://www.theses.fr/2015MULH1599
Queensland University of Technology
13.
Davis, Lloyd Eric.
Heavy vehicle suspensions : testing and analysis.
Degree: 2010, Queensland University of Technology
URL: https://eprints.qut.edu.au/34499/
► Transport regulators consider that, with respect to pavement damage, heavy vehicles (HVs) are the riskiest vehicles on the road network. That HV suspension design contributes…
(more)
▼ Transport regulators consider that, with respect to pavement damage, heavy vehicles (HVs) are the riskiest vehicles on the road network. That HV suspension design contributes to road and bridge damage has been recognised for some decades. This thesis deals with some aspects of HV suspension characteristics, particularly (but not exclusively) air suspensions. This is in the areas of developing low-cost in-service heavy vehicle (HV) suspension testing, the effects of larger-than-industry-standard longitudinal air lines and the characteristics of on-board mass (OBM) systems for HVs. All these areas, whilst seemingly disparate, seek to inform the management of HVs, reduce of their impact on the network asset and/or provide a measurement mechanism for worn HV suspensions. A number of project management groups at the State and National level in Australia have been, and will be, presented with the results of the project that resulted in this thesis. This should serve to inform their activities applicable to this research. A number of HVs were tested for various characteristics. These tests were used to form a number of conclusions about HV suspension behaviours. Wheel forces from road test data were analysed. A “novel roughness” measure was developed and applied to the road test data to determine dynamic load sharing, amongst other research outcomes. Further, it was proposed that this approach could inform future development of pavement models incorporating roughness and peak wheel forces. Left/right variations in wheel forces and wheel force variations for different speeds were also presented. This led on to some conclusions regarding suspension and wheel force frequencies, their transmission to the pavement and repetitive wheel loads in the spatial domain. An improved method of determining dynamic load sharing was developed and presented. It used the correlation coefficient between two elements of a HV to determine dynamic load sharing. This was validated against a mature dynamic loadsharing metric, the dynamic load sharing coefficient (de Pont, 1997). This was the first time that the technique of measuring correlation between elements on a HV has been used for a test case vs. a control case for two different sized air lines. That dynamic load sharing was improved at the air springs was shown for the test case of the large longitudinal air lines. The statistically significant improvement in dynamic load sharing at the air springs from larger longitudinal air lines varied from approximately 30 percent to 80 percent. Dynamic load sharing at the wheels was improved only for low air line flow events for the test case of larger longitudinal air lines. Statistically significant improvements to some suspension metrics across the range of test speeds and “novel roughness” values were evident from the use of larger longitudinal air lines, but these were not uniform. Of note were improvements to suspension metrics involving peak dynamic forces ranging from below the error margin to approximately 24 percent. Abstract models of HV…
Subjects/Keywords: heavy vehicle, truck, lorry, suspension test, Vehicle Standards Bulletin 11 (VSB 11), suspension health, suspension model, dynamic force, wheel force, pavement force, tyre force, spatial repeatability, spatial repetition, road roughness, pavement roughnes; surface roughness, suspension metrics, on-board mass, heavy vehicle telematics, tamper evidence, tamper metrics, load sharing, dynamic load sharing, heavy vehicle suspension frequency, heavy vehicle suspension wavelength, heavy vehicle suspension model
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APA ·
Chicago ·
MLA ·
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APA (6th Edition):
Davis, L. E. (2010). Heavy vehicle suspensions : testing and analysis. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/34499/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Davis, Lloyd Eric. “Heavy vehicle suspensions : testing and analysis.” 2010. Thesis, Queensland University of Technology. Accessed March 02, 2021.
https://eprints.qut.edu.au/34499/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Davis, Lloyd Eric. “Heavy vehicle suspensions : testing and analysis.” 2010. Web. 02 Mar 2021.
Vancouver:
Davis LE. Heavy vehicle suspensions : testing and analysis. [Internet] [Thesis]. Queensland University of Technology; 2010. [cited 2021 Mar 02].
Available from: https://eprints.qut.edu.au/34499/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Davis LE. Heavy vehicle suspensions : testing and analysis. [Thesis]. Queensland University of Technology; 2010. Available from: https://eprints.qut.edu.au/34499/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queensland University of Technology
14.
Darestani, Mostafa Yousefi.
Response of concrete pavements under moving vehicular loads and environmental effects.
Degree: 2007, Queensland University of Technology
URL: https://eprints.qut.edu.au/16662/
► The need for modern transportation systems together with the high demand for sustainable pavements under applied loads have led to a great deal of research…
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▼ The need for modern transportation systems together with the high demand for sustainable pavements under applied loads have led to a great deal of research on concrete pavements worldwide. Development of finite element techniques enabled researchers to analyse the concrete pavement under a combination of axle group loadings and environmental effects. Consequently, mechanistic approaches for designing of concrete pavements were developed based on results of finite element analyses. However, unpredictable failure modes of concrete pavements associated with expensive maintenance and rehabilitation costs have led to the use of empiricalmechanistic approach in concrete pavement design. Despite progressive knowledge of concrete pavement behaviour under applied loads, concrete pavements still suffer from deterioration due to crack initiation and propagation, indicating the need for further research. Cracks can be related to fatigue of the concrete and/or erosion of materials in sub-layers. Although longitudinal, midedge and corner cracks are the most common damage modes in concrete pavements, Austroads method for concrete pavement design was developed based on traditional mid-edge bottom-up transverse cracking introduced by Packard and Tayabji (1985). Research presented in this thesis aims to address the most common fatigue related distresses in concrete pavements. It uses comprehensive finite element models and analyses to determine the structural behaviour of concrete pavements under vehicular loads and environmental effects. Results of this research are supported by laboratory tests and an experimental field test. Results of this research indicate that the induced tensile stresses within the concrete pavement are significantly affected by vehicle speed, differential temperature gradient and loss of moisture content. Subsequently, the interaction between the above mentioned factors and concrete damage modes are discussed. Typical dynamic amplifications of different axle groups are presented. A new fatigue test setup is also developed to take into consideration effects of pavement curvature on fatigue life of the concrete. Ultimately, results of the research presented in this thesis are employed to develop a new guide for designing concrete pavements with zero maintenance of fatigue damage.
Subjects/Keywords: dynamic analysis; dynamic amplification; finite element analysis; finite element model; static analysis; axle group loads; critical axle group configuration; critical position of axle groups; tyre pavement interaction; stress distribution; fatigue failure; concrete pavement distresses; corner cracking; longitudinal cracking; transverse cracking; top-down cracking; bottom-up cracking; boundary conditions; debonding layer; temperature effects; loss of moisture contents; shrinkage effects; curling induced stress; warping stress; pavement curvature; field test; laboratory text; experimental study; truck load; JPCP; JRCP; CRCP; SAST; SADT; TAST; TADT; TRDT; QADT
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APA (6th Edition):
Darestani, M. Y. (2007). Response of concrete pavements under moving vehicular loads and environmental effects. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/16662/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Darestani, Mostafa Yousefi. “Response of concrete pavements under moving vehicular loads and environmental effects.” 2007. Thesis, Queensland University of Technology. Accessed March 02, 2021.
https://eprints.qut.edu.au/16662/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Darestani, Mostafa Yousefi. “Response of concrete pavements under moving vehicular loads and environmental effects.” 2007. Web. 02 Mar 2021.
Vancouver:
Darestani MY. Response of concrete pavements under moving vehicular loads and environmental effects. [Internet] [Thesis]. Queensland University of Technology; 2007. [cited 2021 Mar 02].
Available from: https://eprints.qut.edu.au/16662/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Darestani MY. Response of concrete pavements under moving vehicular loads and environmental effects. [Thesis]. Queensland University of Technology; 2007. Available from: https://eprints.qut.edu.au/16662/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
. 
Open Access Theses and Dissertations