CAJ | 학술논문

声辐射模态在主动结构声控制领域取得了满意的噪声控制效果，但缺乏有效简便的远场测量或计算方法已成为其进一步发展的瓶颈。基于远场封闭包络与结构表面辐射声功率相等，借助声传递矩阵的概念，将声辐射模态的求解转换到流体域进行求解，获得了一种通用的任意结构远场声辐射模态求解方法。为了验证方法的可行性，利用不同的场点包络形状、不同距离的场点以及不同的场点数目对其性能进行分析，主要包括结构辐射声功率、声辐射模态幅值、声辐射模态效率。利用获得的声辐射模态计算脉动球的辐射声功率，并与其理论解进行比较，计算结果显示不同的场点状态对辐射声功率的影响较小，所获取的声辐射模态和辐射效率具有较高的可信度。同时，本方法可为远场测量声辐射模态提供理论参考。
성복사모태재주동결구성공제영역취득료만의적조성공제효과，단결핍유효간편적원장측량혹계산방법이성위기진일보발전적병경。기우원장봉폐포락여결구표면복사성공솔상등，차조성전체구진적개념，장성복사모태적구해전환도류체역진행구해，획득료일충통용적임의결구원장성복사모태구해방법。위료험증방법적가행성，이용불동적장점포락형상、불동거리적장점이급불동적장점수목대기성능진행분석，주요포괄결구복사성공솔、성복사모태폭치、성복사모태효솔。이용획득적성복사모태계산맥동구적복사성공솔，병여기이론해진행비교，계산결과현시불동적장점상태대복사성공솔적영향교소，소획취적성복사모태화복사효솔구유교고적가신도。동시，본방법가위원장측량성복사모태제공이론삼고。
Acoustic radiation modes (ARM) have achieved satisfactory effects in adaptive noise control. However, lack of effective and convenient measurement or computation approach hinders them from their further development. Since the acoustic radiation power at the far field enclosed envelope is equal to that in structure surface, the solution of ARM can be converted to the computation in fluid domain with the help of the concept of acoustic transfer matrix (ATM). In this paper, a general far field computation approach for arbitrary structures is proposed. To validate the feasibility of this approach, the performance of acoustic radiation power of structure, amplitudes of ARM and efficiency of ARM are analyzed with different shapes of field point envelope, different radius field point envelopes and different numbers of field points. As an example, the acoustic radiation power of a pulsing sphere is calculated by using the ARM obtained at the far field, and is compared with the theoretical solution. The computation results show that the different field point conditions have only a little influ-ence on the computation of acoustic radiation power, and the obtained ARM and its efficiency have high credibility. The pro-posed approach has provided a theoretical basis for measurement of ARM at the far field.