基于机敏约束阻尼技术的结构动态性能主动控制

Active Control of Structure Dynamic Performance Based on Smart Constrained Layer Damping Technology

重点研究了局部采用压电机敏约束层阻尼技术的悬臂梁的动态响应控制问题。采用滞弹性位移场(ADF)模型表征结构阻尼材料随频率变化的力学特性,结合有限元分析法(FEA)推导出压电机敏约束阻尼梁的动力学分析模型。求解了机敏结构动力学参数,并与模态实验结果比较验证了模型的正确性。针对结构动力模型自由度庞大问题,提出了基于状态空间的复模态截尾法和内平衡降阶法相结合的全新组合降阶方法,并基于降阶模型设计出状态反馈主动控制器,进行了结构动态性能的主动控制分析。结果表明:本文给出的分析方法准确可行,运用压电机敏约束层阻尼技术可以大大改善结构的动力学响应环境。

The key research on dynamics response control of a cantilever beam partially treated with smart constrained layer damping technology was done. The anelastic displacement fields （ADF） model was used and it considers that the mechanical properties of viscoelastic material vary with fi＇equency and temperature. A dynamics analysis model was derived for piezoelectric smart constrained layer damping beam based on finite element analysis （FEA） and ADF model. The dynamics parameters were solved and compared with tile results of experimental modal analysis. To cope with the huge number of degrees of freedom, this paper put forward a new reduction method which combines both the complex modal truncation method and internal balancing method. A state feedback active controller was designed based on the reduced order model, and then active control of structural dynamic perfbrmance was studied. The results show that the methods proposed in the paper is accurate and feasible, and the structural dynamic response can be greatly improved by using smart constrained layer damping （SCLD） technology.