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中文摘要：
以某卫星天线双轴定位机构为对象,研究运动副间隙对天线定位系统运动特性的影响,采用非线性等效弹簧阻尼模型建立间隙处的接触碰撞模型。同时采用Coulomb摩擦模型考虑运动副间隙处的摩擦作用,并将其嵌入到ADAMS多体系统动力学分析软件中,基于虚拟样机技术建立了含运动副间隙的卫星天线双轴定位机构动力学模型,并采用ADAMS进行了动力学仿真,分析运动副间隙对天线双轴定位机构动力学特性的影响,以及间隙大小对双轴定位机构动力学特性的影响。仿真结果表明,运动副间隙对卫星天线双轴定位机构运动特性有显著的影响,可以较好的预测运动副间隙对双轴定位机构的影响。
英文摘要：
In order to study the effects of joint clearance on dynamics characteristic of the Two-Axis-Position Mechanism of satellite antennas,the contact dynamics model is established by using a nonlinear equivalent spring-damp model and the friction effect is considered by using Coulomb friction model.And then the models are incorporated into ADAMS.The dynamics model of Two-Axis-Position Mechanism with joint clearance is established based on the virtual prototype and the dynamics simulation is made by using ADAMS.Finally,the effects of joint clearance on dynamics characteristics of the Two-Axis-Position Mechanism of satellite antennas are analyzed and the effects of clearance size on its dynamics characteristics are studied.The simulation results show that the joint clearance leads to severe effects on the Two-Axis-Position Mechanism of satellite antennas and the effect of clearance on Two-Axis-Position Mechanism of satellite antennas can be predicted perfectly.
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