CAJ | 학술논문

为降低摩托车发动机辐射噪声,以某摩托发动机壳体为研究对象,采用有限元法/边界元法（FEM/BEM）,对发动机壳体的辐射噪声进行仿真计算,确定了辐射噪声的频带和辐射位置,结合声强实验测试,验证了数值计算的正确性。根据数值模拟的结果,对该发动机壳体结构进行优化,并对优化后的壳体进行了噪声辐射预测,将优化前后的声学量进行对比。结果表明：优化后的发动机壳体表面辐射噪声较优化前有所降低,其噪声值降低约4 dB。
위강저마탁차발동궤복사조성,이모마탁발동궤각체위연구대상,채용유한원법/변계원법（FEM/BEM）,대발동궤각체적복사조성진행방진계산,학정료복사조성적빈대화복사위치,결합성강실험측시,험증료수치계산적정학성。근거수치모의적결과,대해발동궤각체결구진행우화,병대우화후적각체진행료조성복사예측,장우화전후적성학량진행대비。결과표명：우화후적발동궤각체표면복사조성교우화전유소강저,기조성치강저약4 dB。
With a motorcycle engine shell as the research object,analyzed the noise radiation of the engine shell by means of FEM / BEM,and determined the frequency range of the noise radiation and the critical region.Combining with sound intensity test,verified the correctness of the calculation result.The engine shell structure was optimized according to the numerical simulation results,and the noise radiation of the optimized model was predicted.Comparing the noise test results before and after the optimization,it is obtained that the surface radiated noise of the optimized engine shell is reduced about 4dB.