一种基于不平衡力激振的动刚度测试方法  

A New Measurement Method for Dynamic Stiffness Using the Unbalanced Force as Excitation Source

作　　者：李锋[1] 杜强[1] 徐有刚[1] 

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621900

出　　处：《重庆理工大学学报（自然科学）》2013年第9期119-121,127,共4页Journal of Chongqing University of Technology：Natural Science

摘　　要：提出了一种隔振基础动刚度测试方法。该方法以不平衡力作为激振力，测试了不同转速下隔振基础沿径向的微振动位移，并分析了与转速同频的振动位移幅值，通过计算位移与激振力的比值，获得不同转速下隔振基础沿转盘径向的动刚度。运用该方法对某精密离心机隔振基础动刚度进行测试和分析。结果表明：隔振基础在1～5Hz的动刚度为10^8N／m量级，动刚度随着频率先增大后减小。通过计算可知振动位移与不平衡力的相关系数为0．98，从而验证了采用不平衡力作为激振力的可行性。A new measurement method for dynamic stiffness of isolation vibration foundation is pro- posed, which has its own advantages compared to experimental modal analysis. The excitation force needed in the method is unbalanced force from the rotating machine. The micro-vibration displace- ment of foundation along the radial direction is measured and analyzed, and the dynamic stiffness of foundation is ratio of the excitation force and the displacement value in the specified frequency. The method proposed is used to measure and analyze the dynamic stiffness of isolation vibration foundation for precision centrifuge, and the analysis result indicated that dynamic stiffness along the radial direc- tion is about 10s N/m in the range 1 ~5 Hz. It increases first and then decreases gradually with fre- quency. The correlation coefficient of vibration displacement and unbalanced force is 0.98, which verify the feasibility of using unbalanced force as excitation source.

关 键 词：动刚度 隔振基础 微振动 精密离心机 

分 类 号：TB123[理学—工程力学]