基于路面等级匹配的重卡包装物运输激励研究

Transportation Excitation of Heavy Truck Package Based on Road Level Matching

目的利用传感器搭配数据采集卡收集路面不平频谱,将路面信息匹配标准路面等级以及车辆行驶速度。方法通过Matlab将标准PSD与随机激励匹配路面等级,同时建立1/2四轴重卡动力学模型,并用能量法建立动力学方程。将收集的路面不平频谱对应到相应的路面等级,再结合车辆速度的设定,最后求解得到车辆受激励后轮胎的动载位移频谱,分析得出被运输包装物的半挂车平板动载位移。结果重卡运输前轴轮胎在A级路面以60 km/h的车速经过该路面的动载位移量在0.8和9.8 s时达到峰值,且路面响应位移不超过6 cm。结论求得被运输包装物的所受激励频谱,为被包装物的运输振动安全性研究提供支撑,可结合具体被运输包装物的脆值理论,提供被运输物品发生运输损坏的数值仿真。

The work aims to collect the uneven spectrum of the road surface by the sensor in collaboration with the data acquisition card, and match the road surface information with the standard road level and the vehicle running speed. The standard PSD and random excitation were used to match the road level through Matlab. The dynamic model of 1/2 four axle heavy truck was established, and the kinetic equation was established by energy method. The dynamic load displacement spectrum of the excited tire was finally obtained by matching the collected uneven spectrum of road surface with the corresponding road level and then combined with the vehicle speed setting, and then the dynamic load displacement of the semi-trailer plate of the transported packaged articles was obtained through analysis. For the front transportation axle tire of the heavy truck running on the class A pavement at a speed of 60 km/h and passing by such uneven spectrum of road surface, the dynamic load displacement reached its peak respectively at 0.8 and 9.8 s, and the pavement response displacement should not exceed 6 cm. The excited spectrum of the transported packaged articles is obtained, which can provide support for the safety research of the transportation vibration of the packaged articles. Combined with the fragility theory of a specific transported packaged article, the numerical simulation of the transported articles subject to damage in transit is provided.