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You searched for subject:(seat transmissibility). Showing records 1 – 2 of 2 total matches.

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1. Tufano, Saverio. Dynamic response of the coupled human body and seat in vertical and fore-and-aft direction.

Degree: 2011, Università degli Studi di Catania

In many environments vibration is transmitted to a person through a seat. Seats can be designed to reduce the discomfort and the injuries caused by vibration. The efficiency of a seat in reducing vibration depends on the characteristics of the vibration, the characteristics of the seat, and the characteristics of the person sitting on the seat (Griffin, 1990). This research was designed to investigate several aspects of the transmission of vertical and fore-and-aft vibration through polyurethane foams used in seat construction. The research programme was focused on two experiments. The first experiment was designed: (i) to investigate non-linearities in the seat and the human body in the vertical direction and their contributions to seat transmissibility; (ii) to compare the vertical apparent mass of the human body on rigid and soft seats; (iii) to measure and model the vertical dynamic stiffness of polyurethane foam seat cushions and investigate how the dynamic stiffness depends on vibration magnitude and subject characteristics (i.e. sitting weight, and hip breadth). The second experiment was designed: (i) to investigate the dependence of fore-and-aft seat cushion transmissibility on vibration magnitude, foam stiffness and contact with a backrest; (ii) to compare the fore-and-aft apparent masses of the human body on rigid and soft seats; (iii) to measure and model the dynamic stiffness of polyurethane foam seat cushions in the fore-and-aft direction, compare the fore-and-aft and vertical dynamic stiffness of foam, and investigate how fore-and-aft dynamic stiffness depends on subject sitting weight and hip breadth; (iv) to study the linear and non-linear effects of simultaneous vertical and fore-and-aft vibration and investigate whether single-axis transmissibility and single-axis models can be used to predict seat cushion transmissibility in multi-axis vibration environments. Fifteen subjects attended the two experiments. In the first experiment, the vertical force and vertical acceleration at the seat base and vertical acceleration at the seat-subject interface were measured during random vertical vibration excitation (0.25 to 25 Hz) at each of five vibration magnitudes (0.25 to 1.6 ms-2 r.m.s.), with four seating conditions (rigid flat seat and three foam cushions). The measurements are reported in terms of the subject apparent mass on the rigid and foam seat surfaces, and the transmissibility and dynamic stiffness of each of the foam cushions. A frequency domain model was used to identify the dynamic parameters of the foams and to investigate their dependence on subject sitting weight and hip breadth. In the second experiment, the vertical and fore-and-aft forces and accelerations at the seat base and the vertical and fore-and-aft accelerations at the seat-subject interface were measured during random vibration excitation (0.25 to 25 Hz) in fore-and-aft and vertical directions. Using three acceleration magnitudes in each direction (0, 0.25 and 1.0 ms-2 r.m.s.) eight different combinations of vertical and…

Subjects/Keywords: Apparent mass; dynamic stiffness; seat transmissibility; nonlinearity

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APA (6th Edition):

Tufano, S. (2011). Dynamic response of the coupled human body and seat in vertical and fore-and-aft direction. (Thesis). Università degli Studi di Catania. Retrieved from http://hdl.handle.net/10761/373

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):

Tufano, Saverio. “Dynamic response of the coupled human body and seat in vertical and fore-and-aft direction.” 2011. Thesis, Università degli Studi di Catania. Accessed October 22, 2019. http://hdl.handle.net/10761/373.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Tufano, Saverio. “Dynamic response of the coupled human body and seat in vertical and fore-and-aft direction.” 2011. Web. 22 Oct 2019.

Vancouver:

Tufano S. Dynamic response of the coupled human body and seat in vertical and fore-and-aft direction. [Internet] [Thesis]. Università degli Studi di Catania; 2011. [cited 2019 Oct 22]. Available from: http://hdl.handle.net/10761/373.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tufano S. Dynamic response of the coupled human body and seat in vertical and fore-and-aft direction. [Thesis]. Università degli Studi di Catania; 2011. Available from: http://hdl.handle.net/10761/373

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Ciloglu, Hakan. Experimental and numerical investigation of the dynamic seat comfort in aircrafts.

Degree: 2013, University of Ontario Institute of Technology

This research focuses on the dynamic seat comfort in aircrafts specifically during takeoff, landing and cruise through turbulence flight conditions. The experiments are performed using a multi axis shaker table in the Automotive Centre of Excellence (ACE) at the University of Ontario Institute of Technology subjected to sample takeoff, landing and cruise vibration recordings obtained onboard of an actual flight. The input vibrations introduced to the aircraft seats during actual flight conditions and during the experiments in the ACE are compared and it is concluded that the given flight conditions were successfully replicated for the interest of this thesis. The experiments are conducted with two different aircraft seats, economy class and business class. Furthermore, to investigate the importance of seat cushion characteristics in addition to economy and business class seat cushions, three laboratory made cushions were included in the investigation as well. Moreover, the effect of passenger weight is also discussed by conducting the experiments with 1 and 2 identical dummies. It is concluded that static seat properties play a significant role in the comfort perception level as well as flight conditions. Among the three flight condition, landing appeared to be the most uncomfortable case comparing to takeoff and cruise. In addition to experimental work, a numerical study to simulate the flight conditions is undertaken with the initial work of CAD modelling. The simulated responses of the seat is partially matching with experimental results due to unknown parameters of the cushion and the connections of the aircraft seat that cannot be created in the CAD model due to unknown manufacturing processes. Advisors/Committee Members: Mohany, Atef, Kishawy, Hossam.

Subjects/Keywords: Transmissibility; Dynamic seat comfort

…32 Figure 2.15: Effect of magnitude on seat transmissibility (Fairley, 1986)… …36 Figure 2.18: Effect of age on resonance frequency and seat transmissibility (Toward… …Revenue Passenger Kilometers xiii S.E.A.T. Seat Effective Amplitude Transmissibility TLV… …passenger seat). Transmissibility plots show peaks around 12 Hz for the head considering the… …reported that in some situations mechanical seat suspensions provided less transmissibility over… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Ciloglu, H. (2013). Experimental and numerical investigation of the dynamic seat comfort in aircrafts. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/371

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):

Ciloglu, Hakan. “Experimental and numerical investigation of the dynamic seat comfort in aircrafts.” 2013. Thesis, University of Ontario Institute of Technology. Accessed October 22, 2019. http://hdl.handle.net/10155/371.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Ciloglu, Hakan. “Experimental and numerical investigation of the dynamic seat comfort in aircrafts.” 2013. Web. 22 Oct 2019.

Vancouver:

Ciloglu H. Experimental and numerical investigation of the dynamic seat comfort in aircrafts. [Internet] [Thesis]. University of Ontario Institute of Technology; 2013. [cited 2019 Oct 22]. Available from: http://hdl.handle.net/10155/371.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ciloglu H. Experimental and numerical investigation of the dynamic seat comfort in aircrafts. [Thesis]. University of Ontario Institute of Technology; 2013. Available from: http://hdl.handle.net/10155/371

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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