全承载大客车底架动态载荷谱分析

针对全承载式大客车底架设计的需要,在底架后悬和发动机附近选择3个测点。分别在阻隔带路况和小鹅卵石路面进行行走测试,提取大客车底架动态应变的时间历程数据,并利用雨流计数法对实测数据作载荷谱的应变频次分析,得到3个测点两种路面的载荷谱的应变大小和变化规律。发现行驶状态的变换引起应变载荷波动,基本不改变载荷幅值频次分布规律,这表明不同的路面等级将引起底架不同程度的疲劳损伤。测试结果为全承载式大客车底架的设计、仿真与试验提供技术基础。

Dynamic loading spectrum measurement and analyses for full-monocoque chassis

Characteristics of testing the full-monocoque bus chassis were discussed in this paper.Three points were chosen on the chassis rear,which met the requirement of loading spectrum of dynamic stress under tow running conditions. The rain-flow counting method is used to analyze the stress frequency on the chassis. The authors find that transport condition’s transformation causes the strain load fluctuation, which does not change the load peak-to-peak value frequency distribution basically. This indicates that the road surface with different ranks will cause the chassis varying degree fatigue damage. The results demonstrate that this can provide the technology base for the full-monocoque chassis’ s design,simulation and experiment.