基于统计能量分析的热效应对高频声振响应影响研究

目的研究热效应对统计能量分析中三个重要参数的影响规律。方法利用有限元法和波法对耦合损耗因子进行分析计算,采用上述两种计算方法分别在三种工况下(仅考虑材料参数变化的工况;仅考虑热应力影响的工况;综合考虑材料参数变化和热应力影响的工况)进行高频声振响应分析,研究热效应对L型板耦合损耗因子的影响规律。结果两者计算结果基本一致。温度变化会对耦合损耗因子造成一定影响,但是影响有限,相对而言在低频段造成的影响较大,在高频段影响较小。结论在400~5000 Hz频带范围内,利用FEM计算耦合损耗因子,其计算结果与波法计算结果基本一致,证明了它的有效性。

Influences of Thermal Effect on High-frequency Vibro-acoustic Response Based on Statistical Energy Analysis

Objective To study influences of thermal effect on three important parameters in Statistical Energy Analysis (SEA). Methods Finite element method (FEM) and widely-used wave method were used to analyze and calculate CLF. High frequency acoustic vibration response analysis was carried out under the three working conditions (only the working conditions of variable material parameters was considered; only the working conditions affected by thermal stress was considered; the working conditions of variable material parameters and thermal stress effect were comprehensively considered) with the above two calculation methods, and influences of thermal effect on the coupling loss factor of L-plate were studied. Results The calculated results of both were basically identical. The temperature change had certain influences on CLF, but the influences were limited. Relatively speaking, the influences in low-frequency section were obvious; and the influences in high-frequency section were relatively small. Conclusion In 400 - 5000 Hz frequency range, FEM is used to calculate the coupling loss factor. The calculation results are basically identical with that of the wave method. This proves the validity of it.