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Motion Resistance Ratio, Net Traction Ratio and Tractive Efficiency of a Riceland Type Tyre

A study was conducted to determine the accuracy of Wismer-Luth and Brixius equations in predicting the tyre motion resistance ratio, net traction ratio and tractive efficiency of a Riceland type tyre. The tyre was tested on a sandy clay loam soil in an indoor UPM tyre traction testing facility. T...

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Main Author: Khidir, Elwaleed Awad
Format: Thesis
Language:English
English
Published: 1999
Online Access:http://psasir.upm.edu.my/id/eprint/10287/1/FK_1999_17_A.pdf
http://psasir.upm.edu.my/id/eprint/10287/
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spelling my.upm.eprints.102872011-03-21T04:01:04Z http://psasir.upm.edu.my/id/eprint/10287/ Motion Resistance Ratio, Net Traction Ratio and Tractive Efficiency of a Riceland Type Tyre Khidir, Elwaleed Awad A study was conducted to determine the accuracy of Wismer-Luth and Brixius equations in predicting the tyre motion resistance ratio, net traction ratio and tractive efficiency of a Riceland type tyre. The tyre was tested on a sandy clay loam soil in an indoor UPM tyre traction testing facility. The experiment was conducted by running the tyre in two modes; towing mode for the formulation of tyre motion resistance ratio equation and driving mode for the formulation of tyre net traction ratio and tractive efficiency equations. A total of ninety test runs were involved in the tyre motion resistance ratio determinations at three selected inflation pressures (i. e. 221, 193 and 166 kPa) and selected wheel numerics ranging between 0 to 70. From the analysis of covariance (ANCOVA) it was found that both inflation pressure and wheel numeric has significant effect on the tyre motion resistance ratio. Regression analysis was also conducted to determine the closeness offit for Wismer-Luth and Brixius equations in predicting the motion resistance ratio of the tested tyre. Finally, 3 new logarithmic models for the tyre motion resistance ratio were formulated. The 193 kPa inflation pressure revealed a lower tyre motion resistance than the nominated pressure (i.e. 221 kPa) and the 166 kPa. For the tyre net traction ratio and tractive efficiency determinations, 126 test runs were conducted in a combination consisting of three selected inflation pressures (i.e. 221 , 193 and 166 kPa) and two wheel numerics (i.e. 19 and 29) representing two extreme types of soil strength under different levels of travel reduction ranging between 0 to 40%. Regression analysis was conducted to determine the prediction equation describing the tyre torque ratio. Marqurdt' s method used by Wismer-Luth for predicting non-linear equation was found not suitable in predicting the torque ratio of the tested tyre for its low coefficient of determination and inadequacy. The logarithmic model was found to be suitable in predicting the torque ratio. From the analysis of covariance (ANCOVA) the mean effect of travel reduction, tyre inflation pressure and wheel numeric were found to be highly significant where as the interaction of inflation pressure and wheel numeric was not significant. The 193 kPa inflation pressure was the best, among the three inflation pressures used, in getting higher net traction ratio and higher maximum tractive efficiency. 1999-05 Thesis NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/10287/1/FK_1999_17_A.pdf Khidir, Elwaleed Awad (1999) Motion Resistance Ratio, Net Traction Ratio and Tractive Efficiency of a Riceland Type Tyre. Masters thesis, Universiti Putra Malaysia. English
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
description A study was conducted to determine the accuracy of Wismer-Luth and Brixius equations in predicting the tyre motion resistance ratio, net traction ratio and tractive efficiency of a Riceland type tyre. The tyre was tested on a sandy clay loam soil in an indoor UPM tyre traction testing facility. The experiment was conducted by running the tyre in two modes; towing mode for the formulation of tyre motion resistance ratio equation and driving mode for the formulation of tyre net traction ratio and tractive efficiency equations. A total of ninety test runs were involved in the tyre motion resistance ratio determinations at three selected inflation pressures (i. e. 221, 193 and 166 kPa) and selected wheel numerics ranging between 0 to 70. From the analysis of covariance (ANCOVA) it was found that both inflation pressure and wheel numeric has significant effect on the tyre motion resistance ratio. Regression analysis was also conducted to determine the closeness offit for Wismer-Luth and Brixius equations in predicting the motion resistance ratio of the tested tyre. Finally, 3 new logarithmic models for the tyre motion resistance ratio were formulated. The 193 kPa inflation pressure revealed a lower tyre motion resistance than the nominated pressure (i.e. 221 kPa) and the 166 kPa. For the tyre net traction ratio and tractive efficiency determinations, 126 test runs were conducted in a combination consisting of three selected inflation pressures (i.e. 221 , 193 and 166 kPa) and two wheel numerics (i.e. 19 and 29) representing two extreme types of soil strength under different levels of travel reduction ranging between 0 to 40%. Regression analysis was conducted to determine the prediction equation describing the tyre torque ratio. Marqurdt' s method used by Wismer-Luth for predicting non-linear equation was found not suitable in predicting the torque ratio of the tested tyre for its low coefficient of determination and inadequacy. The logarithmic model was found to be suitable in predicting the torque ratio. From the analysis of covariance (ANCOVA) the mean effect of travel reduction, tyre inflation pressure and wheel numeric were found to be highly significant where as the interaction of inflation pressure and wheel numeric was not significant. The 193 kPa inflation pressure was the best, among the three inflation pressures used, in getting higher net traction ratio and higher maximum tractive efficiency.
format Thesis
author Khidir, Elwaleed Awad
spellingShingle Khidir, Elwaleed Awad
Motion Resistance Ratio, Net Traction Ratio and Tractive Efficiency of a Riceland Type Tyre
author_facet Khidir, Elwaleed Awad
author_sort Khidir, Elwaleed Awad
title Motion Resistance Ratio, Net Traction Ratio and Tractive Efficiency of a Riceland Type Tyre
title_short Motion Resistance Ratio, Net Traction Ratio and Tractive Efficiency of a Riceland Type Tyre
title_full Motion Resistance Ratio, Net Traction Ratio and Tractive Efficiency of a Riceland Type Tyre
title_fullStr Motion Resistance Ratio, Net Traction Ratio and Tractive Efficiency of a Riceland Type Tyre
title_full_unstemmed Motion Resistance Ratio, Net Traction Ratio and Tractive Efficiency of a Riceland Type Tyre
title_sort motion resistance ratio, net traction ratio and tractive efficiency of a riceland type tyre
publishDate 1999
url http://psasir.upm.edu.my/id/eprint/10287/1/FK_1999_17_A.pdf
http://psasir.upm.edu.my/id/eprint/10287/
_version_ 1643824560714285056
score 13.211869

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