ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

Dimensional analysis on parameters of wheel-soil interaction system was performed, and the parameters’ scales were also acquired when the density and cohesion of simulant regolith were kept consistent, respectively. The lightweight model method was adopted to eliminate the influence of low gravity environment, and a 1/2 scale lunar rover model was designed. The slope angle and wheel velocity were taken as the experimental factors, the wheel sinkage and slip ratio were taken as the experimental index, test on lunar rover’s slope trafficability was carried out, and the experimental factors’ influences on the wheel sinkage and slip ratio were analyzed. Variation laws of the driving torque, drawbar pull and traction coefficient with the slip ratio under different slope conditions were analyzed. Results indicated that the influence of slope angle on trafficability was more obvious than that of wheel velocity. With the increase of slip ratio, the driving torque and drawbar pull presented increasing trend, and the maximum values of the driving torque and drawbar pull were up to 3.6N·m and 10.5N, respectively. The traction coefficient was increased first and then decreased with the increase of slip ratio, and it was up to its maximum value of 0.18 when the slip ratio was 21.6%. In order to ensure that the lunar rover had safe and reliable trafficability, the exploring slope angle within 20° was reasonable. The research result would provide a reference for the evaluation of lunar rover’s slope trafficability under low gravity environment.