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Prediction and experiment for nearfield sound radiation of
cylindrical shells |
| LI Bingru1,2, WANG Xuanyin1, GE Huiliang3 |
1. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China;
2.School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;
3. Hangzhou Applied Acoustics Research Institute, Hangzhou 310012, China |
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Abstract It is difficult to calculate and measure the nearfield sound radiation which caused by structure vibration of the complicated cylindrical shell. The wave decomposition method and wave superposition method were applied to predict the nearfield pressure. The surface normal vibration velocity and nearfield pressure of simple cylindrical shell were applied to research the prediction effect. According to the analytic computation results, the predicted results affected by different premeasured surfaces and array number were analyzed with the wave decomposition method, and the predicted results affected by different fictitious source positions and array number were analyzed by the wave superposition method. The results show that the wave decomposition performance is better at the large number of the accelerometer, but when the accelerated array number is relative few, the method is inferior to the wave superposition method. The performance of the wave superposition method is influenced by the position of the fictitious source, and the distance between the fictitious source and the surface accelerometer has an optimum value. The experiments on the measurement of the normal vibration velocity and nearfield pressure of simply cylindrical shell under water were done, and the comparison between the predicted results and the experimental results proved the conclusions.
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Published: 20 March 2012
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圆柱壳体近场辐射噪声预报与实验研究
针对由复杂壳体结构振动引起的近场辐射噪声进行理论计算与测量比较困难的现状,引入波数分解法与虚源叠加法,利用壳体表面振速来预测近场声压.根据解析计算结果,采用波数分解法分析了不同的预测面及阵元数对预测结果的影响,采用虚源叠加法分析了虚源位置及阵元数对预测效果的影响.结果表明,在加速度阵元数目较多的情况下,波数分解法预测效果较好,在阵元数目较少的情况下,虚源叠加法的预测效果较好；运用波数分解法进行预测时,沿轴向布放加速度计比沿周向布放预测效果好；采用虚源叠加法的预测效果受虚源位置的影响,虚源距离预测面有一个最优值.利用水下圆柱壳体表面布阵试验所测表面振速结果对近场声场声压进行了预测,经预测结果与实测结果对比,验证了上述结论的正确性.
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