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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 classical shell theory, the forced vibration equation of functionally graded cylindrical shell in the flow field is deduced. The effects of different temperature distribution, shell material parameters and surrounding flow field parameters on the acoustic radiation characteristics of functionally graded cylindrical shell influences. The results show that the change of temperature will cause the change of the material properties of the functionally graded cylindrical shell, and generate thermal stress in the shell, which will affect the sound radiation characteristics of the shell in the flow field. The influence of temperature on radiated sound power in different frequency bands is different. In heavy fluid, the influence of temperature change on the sound power increases with the increase of the frequency. In the light fluid, the temperature of the light fluid moves the peak of the sound power at a lower frequency to a lower frequency and the peak decreases. , As the temperature increases, the radiated sound power decreases. The effect of even temperature increase on the sound radiation characteristics of the shell was higher than that of the non-uniform temperature rise. In the non-uniform temperature rise, the volume fraction index of heavy fluid has more obvious influence on radiated sound power than that of light fluid, which is mainly reflected in the influence on peak position.