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KTH

1. Phadke, Dhruv. Electrification of a diesel-hydraulic off-road machine.

Degree: Machine Design (Dept.), 2017, KTH

This report is for the Master of Science thesis project undertaken for KTH Royal Institute of Technology in collaboration with the Forestry Research Institute of Sweden (Skogforsk) for the Forestry Master Thesis School. The aim of this project was to theoretically explore the possibility of replacing the hydraulic driveline with an electric series driveline and to understand the differences between using one or the other so that it can be convincingly concluded if a Diesel-electric driveline in Forestry forwarders is a worthwhile endeavour or not. In this report, the current status of the XT28 driveline is explored as well as improvements in terms of energy storage, energy recovery and controls are suggested. These two concepts are quantified and compared against a theoretical Diesel-Electric driveline, with details about its different parts from Power source to Motors and Gearboxes discussed at length. These three concepts are compared against each other in terms of Physical characteristics like mass, Performance characteristics like efficiency, energy recovery, energy storage capacity, etc. and Practical characteristics like cost. According to the results of the multiple weighted Pugh matrix comparisons, the theorized Diesel-Electric Driveline holds an edge over even the improved/idealised version of the current XT28 driveline, despite being hampered by the cost. In conclusion, electrification of XT28 is definitely a possibility for the future, only major concern being the high cost associated with it. The efficiency improvements possible through use of hybrid electric driveline are significant, with mass difference between the two concepts much lower than initially expected. However, since most of the performance will depend heavily on control systems and practical losses, the only way to concretely prove the efficiency advantage is through detailed computer modelling or manufacturing prototype.

Denna avhandling är resultatet av ett examensarbete för en masterexamen i maskinkonstruktion vid KTH Kungliga Tekniska Högskolan. Examensarbetet har bedrivits på uppdrag av det svenska skogsbrukets forskningsinstitut Skogforsk. Syftet med detta projekt var att teoretiskt undersöka möjligheten att ersätta den hydrauliska drivlinan i fullskaleprototypen XT28 med en diesel-elektrisk och för att förstå fördelarna och nackdelarna med att använda den ena, samt att försöka värdera möjligheterna och nyttan med diesel-elektriska drivlinor i skogsmaskiner. I denna rapport undersöks status för nuvarande drivlina. Vidare, föreslås potentiella förbättringar när det gäller energilagring, energiåtervinning och reglering. Dessa egenskaper kvantifieras och jämförs med en teoretisk diesel-electrisk drivlina, med dess viktigaste komponenter från kraftkälla till motorer och växellådor. De tre egenskaperna jämförs med varandra med avseende på fysiska egenskaper som massa, samt prestandaegenskaper, som effektivitet, energiåtervinning, energilagringskapacitet etc., och även andra egenskaper som…

Subjects/Keywords: driveline control; efficiency; energy storage; XT28; drivlina; energilagring; reglering; XT28; verkningsgrad; Engineering and Technology; Teknik och teknologier; Engineering and Technology; Teknik och teknologier

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

APA (6th Edition):

Phadke, D. (2017). Electrification of a diesel-hydraulic off-road machine. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-219918

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):

Phadke, Dhruv. “Electrification of a diesel-hydraulic off-road machine.” 2017. Thesis, KTH. Accessed May 06, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-219918.

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

MLA Handbook (7th Edition):

Phadke, Dhruv. “Electrification of a diesel-hydraulic off-road machine.” 2017. Web. 06 May 2021.

Vancouver:

Phadke D. Electrification of a diesel-hydraulic off-road machine. [Internet] [Thesis]. KTH; 2017. [cited 2021 May 06]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-219918.

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

Council of Science Editors:

Phadke D. Electrification of a diesel-hydraulic off-road machine. [Thesis]. KTH; 2017. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-219918

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

2. Baez, Federico. Multi-objective optimization and performance evaluation of active, semi-active and passive suspensions for forestry machines.

Degree: Machine Design (Dept.), 2014, KTH

The development of forestry machines is currently heading towards new solutions that reduce their impact on the environment and in particular on the soft forest soil in which the machines operate. The terrain conditions that forestry machines encounter in their regular duties can be very rough, and if the vehicle-ground interaction is not properly controlled cumulative damage can progressively aggravate these conditions and potentially render a route or a zone impracticable, apart from causing a detrimental effect in the forest environment. In addition, new machine solutions must be considerably less damaging, both physically and mentally, to operators. There are certain imposed limits to the whole body vibrations to which industrial workers are exposed daily, which are very hard to fulfil in the context of wood harvesting operations with the current technological state of the machines. Chassis-suspended solutions in the market of forestry vehicles are practically inexistent. Multiple wheeled tracks and/or bogies are current solutions that improve dynamic performance and ground contact area of forestry vehicles, but they do not include suspension elements. Cab and seat suspensions are also used to reduce whole body vibrations, but they are only effective up to a certain degree, due to their relatively short stroke length and directional limitations. The implementation of chassis suspensions in forestry machines is therefore a very interesting open area of research in forestry technology. In this context the XT28, a forwarder prototype with active pendulum arm suspension, is currently being developed by Extractor AB in collaboration with Skogforsk; the Forestry Research Institute of Sweden. The present project focuses in analysis and comparison of the performance that active, semi-active and passive suspension systems with pendulum arm architecture would present, by studying their application in the XT28 machine. These systems have the potential to significantly improve forestry vehicle performance in terms of terrain friendliness and whole body vibrations over an unsuspended system. The task is carried out with the help of Multi-Body Dynamics simulation software along with other simulation and computational tools. Additionally, a general method to optimize and analyse forestry vehicle suspension performance is proposed and applied to the case of the XT28, which provides a fair and standardized way to compare the performance of the different suspensions. Keywords: Forestry machine, suspension, multi-objective optimization, forwarder, pendulum arm, active, semi-active, passive, XT28, Multibody Dynamics, soil-friendly, off-road.

Utvecklingen av skogsmaskiner är för närvarande på väg mot nya lösningar som minskar deras påverkan på miljön och i synnerhet på mjuk skogsmark. Skogsmaskinerna verkar ofta i mycket oländig och ojämn terräng, och om interaktionen mellan fordon och mark är alltför okontrollerad, så kan interaktionen ge upphov till kumulativa markskador som gradvis förvärras efter flera…

Subjects/Keywords: Forestry machine; suspension; multi-objective optimization; forwarder; pendulum arm; active; semi-active; passive; XT28; Multibody Dynamics; soil-friendly; off-road; Skogsmaskin; fjädring; optimering; skotare; pendelarm; aktiv; semi-aktiv; passiv; XT28; flerkroppsdynamik; markvänlig; off-road

…6 2.4 XT28 AND THE PENDULUM ARM SUSPENSION… …19 4.1 XT28 FORWARDER SIMULATION MODEL… …53 A. WEIGHT ESTIMATION OF XT28 COMPONENTS… …Skogforsk, 2014). Within the framework of this research a forwarder prototype, the XT28, is… …suspension systems for Skogforsk’s XT28 forwarder would provide valuable feedback on the… 

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Baez, F. (2014). Multi-objective optimization and performance evaluation of active, semi-active and passive suspensions for forestry machines. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156657

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):

Baez, Federico. “Multi-objective optimization and performance evaluation of active, semi-active and passive suspensions for forestry machines.” 2014. Thesis, KTH. Accessed May 06, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156657.

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

MLA Handbook (7th Edition):

Baez, Federico. “Multi-objective optimization and performance evaluation of active, semi-active and passive suspensions for forestry machines.” 2014. Web. 06 May 2021.

Vancouver:

Baez F. Multi-objective optimization and performance evaluation of active, semi-active and passive suspensions for forestry machines. [Internet] [Thesis]. KTH; 2014. [cited 2021 May 06]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156657.

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

Council of Science Editors:

Baez F. Multi-objective optimization and performance evaluation of active, semi-active and passive suspensions for forestry machines. [Thesis]. KTH; 2014. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156657

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

.