质量特性测试平台负载作用下的干扰力矩

Disturbance torque acted on by load for mass properties measuring instrument

针对负载作用下质量特性测试平台弹性变形引起干扰力矩的问题,研究浮起平台负载作用下产生干扰力矩的规律。根据弹性力学薄板弯曲理论,推导出在负载作用下有限元单元质心位移公式及结构整体质心弹性位移公式,给出浮起平台的干扰力矩公式,计算质量特性测试平台在测量过程中质心的弹性位移和由此产生的干扰力矩。研究结果表明:平台变形引起的干扰力矩为偏航角ψ的函数,幅值为平台自身重力和质心位移的乘积。分析结果为测试平台的结构设计和测试精度的提高提供了依据。

Based on the problem of disturbance torque caused by the elastic deformation existing in the load platform acted on by load,the laws of disturbance torque from the load platform were researched.According to the theory on the lamella bending of elastic mechanics,the formulary for the element center of mass displacement of the finite element and for the platform structure center of mass elastic displacement was deduced.And the disturbance torque formulary about the platform was given.Central mass elastic displacement resulting from deformation of the platform of mass properties measuring instrument acted on by load and the disturbance torque resulting from the displacement were calculated.The results show that the disturbance torque is ψ function,and the amplitude is the product of platform gravity and central mass displacement.The research results provide bases for the structure design of the measuring instrument platform and the improvement of measuring precision.