不同载荷识别的结构振动传递路径分析方法研究

为提高传递路径分析(Transfer Path Analysis,TPA)方法在结构振动传递特性分析中的有效性和工程实用性,提出不受振源存在或移除影响的逆矩阵法(MIM)识别工作载荷,并与直接测量法、复刚度法(CSM)、参数化模型的动刚度法在载荷识别时的适用范围、性能特点进行比较分析。由此建立相应的三种TPA方法,并结合振动模型算例,系统深入地分析三种TPA方法的性能以及结构特性参数对TPA方法性能的影响。分析结果表明给出的MIM-TPA方法在结构振动传递特性分析时具有更佳的精度和稳定性,并最终确定不同TPA方法的计算精度、效率及适应范围,极具工程应用价值。

Research on Structural Vibration Transfer Path Analyses using Different Load Identification Methods

To improve the validity and engineering practicability of transfer path analysis method which was used to analyze the vibration transfer characteristics, a novel matrix inverse method (MIM) for identifying load, regardless of the noise sources were removed or retained, was proposed. And then the new method is in-depth comparison with the classical load identification methods such as the complex stiffness method and its parametric model. Thus, the three corresponding TPA methods were also established. Based on the examples of vibration model, the performance of three TPA methods and the influence of structural parameters on the performance of TPA method are deeply analyzed systematically. The results show that the new MIM-TPA method has better accuracy and stability in structural vibration transfer characteristics analysis. Moreover, the accuracy, efficiency and applied scope of several algorithms are also determined.