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Dynamics analysis of dual-axis positioning mechanism of satellite antenna with joint clearance

机译：具有关节间隙的卫星天线双轴定位机构的动力学分析

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Purpose - The existence of clearance in joints of positioning mechanism is inevitable and the movements of the real mechanism are deflected from the ideal mechanism due to the clearances. The purpose of this paper is to investigate the effects of clearance on the dynamic characteristics of dual-axis positioning mechanism of a satellite antenna. Design/methodology/approach - The dynamics analysis of dual-axis positioning mechanism with clearance are investigated using a computational approach based on virtual prototyping technology. The contact model in joint clearance is established by using a hybrid nonlinear continuous contact force model and the friction effect is considered by using a modified Coulomb friction model. Then the numerical simulation of dual-axis positioning mechanism with joint clearance is carried out and four case studies are implemented for different clearance sizes. Findings - Clearance leads to degradation of the dynamic performance of the system. The existence of clearance causes impact dynamic loads, and influences the motion accuracy and stability of the dual-axis positioning mechanism. Larger clearance induces higher frequency shakes and larger shake amplitudes, which will deteriorate positioning accuracy. Practical implications - Providing an effective and practical method to analyze dynamic characteristics of dual-axis positioning mechanism of satellite antenna with joint clearance and describing the dynamic characteristics of the dual-axis positioning system more realistically, which improves the engineering application. Originality/value - The paper is the basis of mechanism design, precision analysis and robust control system design of dual-axis positioning mechanism of satellite antenna.
机译：目的-不可避免地在定位机构的关节中存在间隙，并且由于间隙的存在，实际机构的运动会偏离理想机构。本文的目的是研究间隙对卫星天线双轴定位机构动态特性的影响。设计/方法/方法-使用基于虚拟原型技术的计算方法，研究了带有间隙的双轴定位机构的动力学分析。通过使用混合非线性连续接触力模型建立关节间隙中的接触模型，并使用改进的库仑摩擦模型考虑摩擦效果。然后，对带有联轴器间隙的双轴定位机构进行了数值模拟，并针对不同的间隙尺寸进行了四个案例研究。结果-清除会导致系统动态性能下降。游隙的存在会影响动载荷，并影响双轴定位机构的运动精度和稳定性。较大的间隙会引起较高频率的振动和较大的振动幅度，这会降低定位精度。实际意义-提供一种有效且实用的方法来分析具有关节间隙的卫星天线双轴定位机构的动态特性，并更现实地描述双轴定位系统的动态特性，从而改善工程应用。原创性/价值-本文是卫星天线双轴定位机构的机构设计，精度分析和鲁棒控制系统设计的基础。

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