摘要
基于经典壳体理论,推导了热环境下,流场中功能梯度圆柱壳的受迫振动方程,研究了不同温度分布方式、壳体材料参数以及周围流场参数对功能梯度圆柱壳声辐射特性的影响。研究结果表明:温度变化会引起功能梯度圆柱壳材料特性的改变,在壳体内产生热应力,影响流场中壳体的声辐射特性。温度变化对不同频段壳体辐射声功率的影响不同。重流体中,温度变化对声功率的影响随着频率的增高而增大;轻流体中,温度升高使频率较低时的声功率峰值向低频方向移动,且峰值减小,当接近环频率时,随着温度升高,辐射声功率下降。均匀升温对壳体声辐射特性的影响高于非均匀升温。非均匀升温时,重流体中体积分数指数对辐射声功率的影响比轻流体中更明显,且主要体现在对峰值位置的影响。
Based on the classical shell theory, the forced vibration equations of functionally graded cylindrical shells in the thermal environment with fluid are deduced. The influences of different temperature distribution patterns, shell material parameters and surrounding fluid field parameters on sound radiation induced by functionally graded cylindrical shells are studied. The results show that the temperature variation will change the shell material properties, and generate the thermal stress in the shell, which will impact the characteristics of sound radiation from the shell in the fluid field. The influence of temperature variation is different on the sound power in different frequencies. In the heavy fluid, the impact of temperature variation to the sound power is enhanced with the rising of frequency. In the light fluid, the peak value of sound power is decreased and moved to the low-frequency with the rising of tempera^tre when the frequency is lower, and the sound power near the loop frequency is reduced as well. The influence of uniform temperature rise on sound radiation characteristics is more obvious than that of no-uniform temperature rise. With the no-uniform temperature rise, the impact of volume fraction exponent to sound power in the heavy fluid is more apparent than that in the light fluid, and is embodied in the peak position primarily.
出处
《工程力学》
EI
CSCD
北大核心
2013年第6期334-339,352,共7页
Engineering Mechanics
基金
国家自然科学基金重点项目(50939002)
关键词
圆柱壳
功能梯度材料
声辐射
温度
体积分数指数
cylindrical shell
functionally graded material
sound radiation
temperature
exponent of volumefraction
