基于纯加速度测量的隔振器阻抗测试方法

AMethod for Isolator Impedance Testing Based on Acceleration Measurement

隔振器的阻抗特性是船舶机电设备隔振系统设计与评估的重要输入参数。考虑到ISO标准及国标中对力传感器频响要求较高及边界支反力的影响,本文提出了基于纯加速度测量的隔振器阻抗测试方法。首先根据四端参数法推导了任意边界条件下隔振器的阻抗关系式,然后在准自由边界条件下通过加速度测量对某橡胶隔振器进行了阻抗测试,利用牛顿第二定律和加速度信号测量替代了力传感器实现力的测量。测试结果与理论计算结果吻合,验证了测试方法的有效性。

Impedance characteristics of isolators are important input parameters in design and evaluation for isolation systems of ship's power plants. Taking into consideration of exact demand for frequency response of force sensor according to ISO and Chinese Standard and the effect of boundary forces in experiment, a method for isolator impedance testing based on acceleration measurement only is put out in this paper. Four-polar parameter equations are used to deduced the expressions of the isolator impedance under arbitrary boundary conditions. Then, impedance testing on a rubber isolator is carried out under quasi free boundary condition. The results from test match well with those from theoretical computation . Thus, the effectiveness of the pure acceleration testing method proposed in this paper is validated.