Authors: Bohdan T. Kulakowski, Daniel C. Husted, Donald A. Streit, William J. Kenis
Addresses: The Pennsylvania State University, University Park, PA 16802, USA. ' The Pennsylvania State University, University Park, PA 16802, USA. ' The Pennsylvania State University, University Park, PA 16802, USA. ' Federal Highway Administration, 6300 Georgetown Pike, McLean, VA 22101, USA
Abstract: This paper presents the results of analyses of measurements of dynamic tyre forces generated by a two-axle truck with leaf spring suspension in experiments conducted on a hydraulic actuation system (road simulator). The road simulator, called DYNmAC, has four actuators equipped with load scales to measure dynamic forces applied by the truck wheels. The dynamic tyre forces are characterised by a Dynamic Load Coefficient (DLC) defined as the ratio of standard deviation over mean tyre force. The test variables were: tyre type (standard radial dual, low-profile dual, and wide-base ||super single|| tyre), tyre inflation pressure, vehicle speed, wheel static load, and road roughness. The DLC values obtained for the two dual tyres were very similar for all combinations of test variables. The wide-base tyre produced DLC|s 10 to 12 percent lower than each of the dual tyres. Linear regression models were developed for each of the three tyre types, relating DLC to tyre inflation pressure, vehicle speed, wheel static load, and road roughness. One hundred and forty-four (144) data points were used in deriving each model. The effects of the test variables on DLC were similar for all tyres. Based on the regression results, the test variables can be ranked in terms of their effect on DLC as follows: vehicle speed (strongest effect), road roughness, wheel static load, and tyre inflation pressure (weakest effect). The pavement damage potential of the three types of tyres was evaluated using Eisenmann|s road stress factor. The results indicate that the wide-base tyre is likely to cause pavement damage twice as large as each of the dual tyres.
Keywords: dynamic wheel loads; heavy vehicles; road simulator; pavement damage; dynamic load coefficient; road damage; dynamic tyre forces; simulation; truck suspension; tyre inflation pressure; vehicle speed; wheel static load; road roughness; road stress factor; vehicle dynamics.
International Journal of Heavy Vehicle Systems, 1996 Vol.3 No.1/2/3/4, pp.293 - 305
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