点源模型在旋转声源声场计算中的推广应用  

Extended application of the point source model for the acoustic field solution of the rotating source

作　　者：付建[1] 王永生[1] 

机构地区：[1]海军工程大学动力工程学院,湖北武汉430033

出　　处：《哈尔滨工程大学学报》2014年第6期719-724,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金青年基金资助项目(51209212)

摘　　要：针对螺旋桨、喷水推进器、风扇等旋转机械,研究了基于点源模型的旋转声源负载噪声频域预报方法。结合点源模型理论,将旋转声源离散为均匀分布在运动轨迹上的有限个固定声源,各声源间时域的迟滞时间转换为频域的相位差,所有点声源声场的总和即为旋转声源的声场。结合自由空间旋转点源和旋转力源声场仿真计算,验证了旋转声源离散方法的准确性;计算分析了不同半径、不同频率旋转声源对离散点数的要求;以单个螺旋桨叶片为对象,提出了叶片表面旋转力源按声场网格离散和分块离散的方法,并验证了离散方法的有效性,为点源模型在旋转声源声场中的推广应用提供了前提。In order to forecast the noise of circumvolve machines such as propellers, waterjets or pumps, the method of the point source model is studied to predict the loading noise of the rotating source in the frequency domain. The rotating source can be replaced by finite stationary sources distributing along the rotating trace, and the time difference between sources can be transformed into phase differences in the frequency domain. The sound field of the rotating source is equal to the summation of all of the point sources. The veracity of the discretization method is validated by the freedom sound field simulation of the rotating point source and rotating force source. And the requirement of the number of discrete points of the rotating source with a different radius and frequency is analyzed. Finally, taking the single propeller blade as the object, two discretization methods of blade rotating force are put forward. One method is to take each acoustic mesh as a single force source, and the other method is to divide the blade into segments and each segment can be taken as a single force source. The validity of these discretization methods has been validated, which can provide the precondition for the extended application of the point source model for the sound field calculation of the rotating source.

关 键 词：点源模型 旋转声源 负载噪声 离散点数 离散方法 

分 类 号：O42[理学—声学]