行波管与混响室噪声试验等效转换方法研究

Research on the Equivalent Conversion Method for Progressive Wave Tube and Reverberation Chamber Nosie Test

随着机载舱内设备面临的噪声环境越来越恶劣,以往采用混响室进行舱内设备噪声试验的方式逐渐难以满足高声压噪声试验的需求。针对该问题,本文基于响应等效理论,提出了一种行波管与混响室噪声试验等效转换的方法,即通过试验获得相对较低的声压下行波管与混响室空间相关系数,经计算得到声场转换系数对试验控制谱进行修正,采用修正后的声谱开展高量级噪声试验。最后,采用该方法进行了试验验证,行波管试验中试验件上目标点响应与混响室试验中响应接近,证明了所提方法的可行性及准确性。

As the noise environment of the inboard equipment is becoming more and more severe,it is difficult to meet the requirements of high sound pressure noise test by using reverberation chamber in the past.In response to the above problems,based on the response equivalent theory,an alternative method of inboard equipment reverberation noise test based on progressive wave tube is given,that is,the spatial correlation coefficient of the progressive wave tube and the reverberation chamber under the relatively low sound pressure can be obtained through the noise test,and the conversion coefficient is calculated to correct the sound pressure spectrum of the progressive wave tube,then the corrected sound spectrum was used to carry out noise test.Finally,the proposed method is verified by experiments,and the response of the target point on the progressive wave tube noise test is close to that of the reverberation chamber noise test,which proves the feasibility and accuracy of the proposed method.