利用声场重构预估声源辐射声功率.pdfVIP

利用声场重构预估声源辐射声功率 姜哲，杨东升 (江苏大学振动噪声研究所，江苏镇江212013) 摘要：针对中低频声辐射，提出了基于声辐射模态、利用声场重构进行声功率预估的方法．通过声 场重构获得声源辐射的整个声压场，基于远场径向积分来计算声功率，推导出了辐射声功率计算公 式．以平板声源为例进行仿真验证，讨论影响预估精度的一些因素，分析声场重构法预估声功率的 稳定性，并与工程测量法进行对比分析．结果表明，由于声场重构法基于近场测量，能够获得远场足 够多的信息，在测点不多的情况下可以达到更高的预估精度，并且具有很好的稳定性． 关键词：声功率；声辐射模态；声场分布模态；声场重构；正则化方法 中图分类号：TB532；TBll5文献标志码：A forsound ofacousticfieldsreconstruction Application powerprediction Zhe，玩昭Dongsheng J／ang Research andNoise 212013，China) (Vibration Division，JiangsuUniversity，Zhenjiang，Jiangm reconstructionbasedontheacousticradiationmodeswasusedtoestablish acousticfields Abstract：The themethodfor radiatedacousticatmediumandlow wholesonic calculating power frequencies．卟epres- wasobtainedmeansofacousticfields surefieldof acousticsoundsource by reconstruction，and radiating acousticWaScalculatedbasedondistantfieldradial formulaofradiatedacoustic power integral．The power wascarriedouton sourc圮asan faetom the WaSdeduced．Simulation panel example．Someaffecting of was the the re- were themethod methodof acousticfield accuracydiscussed，thestability analyzed，and constructionWas withthe measurementmethod．．nlerestdtsshowthat rich compared engineering enoudl canbeobtainedacousticfields isbasedonthenearfield far—fieldinformation