为满足工程中机械设备对多维振动和冲击的隔离要求,设计一种新型2-PRC-PR(C)并联机构减振平台.该平台是在3-PRC并联机构的基础上,通过把一支链和上平台连接处的圆柱副改为一复合运动副,使该机构实现三自由度3-PRC并联机构与四自由度2-PRC-PR^C并联机构之间的切换,并在主动副处辅以弹簧阻尼,使该机构能够实现三维隔振与四维隔振.对该机构进行运动学和动力学分析,在此基础上将系统参量分类,并对参数较多类别采用正交试验法,分析各参数对系统固有频率的影响规律和贡献量.研究结果表明:多维减振平台中有关参量对系统固有频率的影响具有不同于单自由度减振装置的特性.%In order to meet the requirement to reduce the multi-dimensional vibration and shock from equipment and machines, a vibration isolation platform was proposed based on a 2-PRC-PR(C) parallel mechanism. This mechanism came from a 3-PRC parallel mechanism by replacing one of the cylindrical pairs at the moving platform with a combined pair. Thanked to the combined pair, the proposed platform could be switched between 3-PRC parallel mechanism with 3 degrees of freedom and 2-PRC-PR^C parallel mechanism with 4 degrees of freedom. 3 or 4 dimensional vibration isolation could be realized when spring damping were put on the active motion pairs. The kinematics and dynamics of the system were studied, and then the influence principle and contribution of the platform's parameters on its natural frequency were analyzed by orthogonal experiment method. The results show that the relevant parameters effects on the natural frequency of the system are different from the single degree of freedom vibration reduction device.
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