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设计一套测试轮胎型号介于6.00-12与9.5-20之间的单轮牵引性能测试试验装置。对比分析了滑轨-内外框架式与平行四连杆-内外框架式2种框架结构的优缺点,确定使用前者作为装置主体,液压马达作为驱动轮胎动力源。针对在试验过程中由于地面不平整而导致传感器测力方向不稳定的问题,设计了内外框架的整体结构:测力传感器布置于内外框架间,使用预紧弹簧使两端球铰式拉压传感器始终受到拉力。利用Pro/E软件建立了装置框架三维模型,同时建立了计算外框架最大应力的数学计算模型并进行了计算。利用有限元分析软件ANSYS对其内外框架进行应力应变仿真,最大应力结果与理论计算结果相近,并在此基础上进行了结构强度分析和优化。结果表明,优化后内外框架在保证框架总体重量最小的基础上应力应变明显减小,达到使用刚度、强度。针对内外框架试验时的振动特性进行了模态分析和预测,仿真后分别得到了内外框架前四阶的固有振动频率。
Design a test device for testing the single wheel traction performance between 6.00-12 and 9.5-20. The advantages and disadvantages of two kinds of frame structure of slide rail - inner and outer frame type and parallel four-link - inner and outer frame are compared and analyzed. The former is used as the main body of the device, and the hydraulic motor is used as the power source of driving tire. In order to solve the problem that the direction of force measurement is unstable due to uneven ground during the test, the overall structure of the inner and outer frames is designed. The load cell is arranged between the inner and outer frames, the two ends of the ball joint tension and compression sensor Always be pulled. The three-dimensional model of the device frame was established by using Pro / E software, and the mathematical calculation model for calculating the maximum stress of the outer frame was established and calculated. The finite element analysis software ANSYS is used to simulate the stress and strain of the inner and outer frames. The results of maximum stress and theoretical calculation are similar. Based on this, the structural strength analysis and optimization are carried out. The results show that the optimized internal and external frameworks can reduce the stress and strain obviously and achieve the use stiffness and strength on the basis of ensuring the minimum overall frame weight. The modal analysis and prediction of the vibration characteristics of the inner and outer frame were carried out. After the simulation, the natural frequencies of the first four stages of the inner and outer frames were obtained respectively.