基于灵敏度分析的隔振器模型修正方法

Model updating method for vibration isolation based on the sensitivity analysis

直接基于正弦试验数据的模型修正研究较少,充分利用工程中积累的正弦试验数据进行结构模型修正具有重要的工程意义。本文针对航天舱段结构中的隔振器,研究采用弹簧阻尼单元进行有限元简化建模,以实测的隔振器前后端振动响应数据获得的传递函数为目标,隔振器的垂向刚度和阻尼为设计变量,利用灵敏度分析的方法对刚度和阻尼参数进行修正。修正后模型分析结果无论是固有频率还是幅值均与试验数据吻合很好,并且模型修正的过程简单、实用性强,可以应用于后续的工程结构。

The research of model updating based on the sine test data is less.Making full use of the accumulated sine test data plays an important role in model updating process.The vibration isolator for aerospace cabin structure is built by spring damping element.With the isolator vertical stiffness and damping as design variables,the transfer function obtained from two ends of the vibration test data as design objectives,the stiffness and damping parameters are updated by the sensitivity analysis.With the updated model,resonant frequencies agree well with test results,as well as resonant amplitudes.The model updating process is very simple and practical,which can be used in the following engineering structures.