空间机械臂收拢状态零重力模拟

Zero-g Simulation of Space Manipulator in Furled Status

利用吊丝配重法进行零重力模拟装置的结构设计,结合重力补偿原理推导出空间机械臂分离体静力学重力补偿计算公式,同时采用最小方差原理将多个力矩的优化问题转化为一个总体目标,建立了吊点力优化程序,通过该优化程序得到各吊点力的数值.当吊丝长度为1000mm时,利用ADAMS建立空间机械臂零重力模拟装置模型.当空间机械臂为静止状态时,吊点优化计算结果与仿真值相比,结果相对误差在10%左右;当空间机械臂各关节以0.5°/s和1°/s匀速运动时,零重力模拟装置对其产生的附加弯曲力矩和附加反转矩均未超过技术指标要求.因此,该方案可用于实际空间机械臂的零重力模拟.

The zero-g simulation device is designed by using suspender spring and counter weight,and the static gravity compensation formulas of space manipulator＇s detached body are deduced with gravity compensation theory.Based on the least minimum square theory,an optimization program of suspension force is developed,through which the optimization of multiple torques is transformed into the optimization of a whole target,and the numerical value of each suspension force can be obtained.The model of the zero-g simulation device of space manipulator is built in ADAMS when the length of suspender spring is 1 000 mm.Under the condition that the space manipulator is in stationary state,the relative errors between the optimization results and the simulation results are around 10%.And the bending torque and counter torque generated by the zero-g simulation device can meet the technical requirements when each joint of space manipulator moves at the constant angular speed of 0.5°/s and 1°/s.Therefore,this approach is suitable for zero-g simulation of space manipulator.