被动式Stewart隔冲平台的刚度特性
Research on Stiffness Characteristics of a Passive Stewart Shock Isolation Platform

建立了Stewart隔冲平台的运动微分方程，分析了隔冲平台3个方向的动态刚度特性，讨论了刚度大小对平台抗冲击性能的影响，对隔冲平台进行了落锤式冲击试验，并与仿真结果进行了对比。研究结果表明：被动式Stewart隔冲平台的三向动态刚度近似呈线性；隔冲平台的横向冲击隔离率大于纵向冲击隔离率，纵向冲击隔离率大于垂向冲击隔离率；试验所得的冲击隔离率达到86.39%以上。研究成果可为Stewart隔冲平台在船舶设备抗冲击中的实际应用提供理论和试验依据。
First, the differential equations of the motion of a Stewart shock isolation platform are established. The three-directional dynamic stiffness characteristics of the platform are analyzed. The effect of stiffness on the shock isolation performance of the platform is discussed. Then, a drop-type shock test is performed on the platform. The results are compared with that of the simulation, proving that the dynamic stiffness of the passive Stewart shock isolation platform is approximately linear. The horizontal shock isolation rate of the Stewart platform is greater than the longitudinal shock isolation rate, which is greater than the vertical shock isolation rate. Moreover, the shock isolation rates of the test in all three dimensions are greater than 86.39%. These results provide the theoretical and experimental foundation for the practical application of the Stewart platform forshock resistance inship equipment.