CAJ | 학술논문

采用等效源方法建立了辐射体表面法向振速到场点声压的传递函数，实现了声场的数值预报。以相对速度误差为评价指标，对等效源法的求解精度进行了先验判定，提出了以1／2速度误差限制线来确定等效源法适用的频率范围，进一步以声辐射效率为指标对声压计算结果的合理性进行后验判定。分别针对单个频率点、多个频率点对等效源的位置进行优化，结果表明存在最优等效声源位置以满足辐射体表面法向振速的最佳匹配。将等效源的优化方法应用于具有声反射面的脉动球源及锥－柱组合壳体的辐射声场预报，预报结果与解析解及边界元法计算结果吻合较好，说明等效源法在工程上应用是可行的。
채용등효원방법건립료복사체표면법향진속도장점성압적전체함수，실현료성장적수치예보。이상대속도오차위평개지표，대등효원법적구해정도진행료선험판정，제출료이1／2속도오차한제선래학정등효원법괄용적빈솔범위，진일보이성복사효솔위지표대성압계산결과적합이성진행후험판정。분별침대단개빈솔점、다개빈솔점대등효원적위치진행우화，결과표명존재최우등효성원위치이만족복사체표면법향진속적최가필배。장등효원적우화방법응용우구유성반사면적맥동구원급추－주조합각체적복사성장예보，예보결과여해석해급변계원법계산결과문합교호，설명등효원법재공정상응용시가행적。
Based on the equivalent source method (ESM),the transfer function from the normal vibration velocity of a radiation body's surface to the sound pressure of a field point was built and the prediction of a sound field was realized.To evaluate the accuracy of ESMin prior,the relative velocity error index was used and a 1 /2 restrict-line of the velocity error was given to determine the frequency range for which ESM is applicable.The rationality of the sound pressure calculation results were evaluated via the sound radiation efficiency index afterward.Then the locations of the equivalent sources were optimized for single frequency points and multi-frequency points,respectively.The results showed that there is an optimal sound source location to satisfy the best match of the normal vibration velocity of the radiation surface.Finally,the ESM optimization algorithm was applied to predict the radiation sound fields of a pulsating sphere with a sound reflection surface and a coupled conical-cylindrical shell,the prediction results agreed well with those of the analytical method and BEM.The results indicated that the ESMis applicable for engineering problems.