分布声源的有源消声理论研究

本文从理论上讨论了次级声源为点源时的空间有源消声特点,以远场声压为零为出发点,导出了初级源为分布声源时计算次级声源复强度的表示式。分析表明空间声压为零条件与系统辐射功率最小条件是一致的。最后本文计算了几种典型初级声源时次级源强度,所得结果利用Nelson 理论进行了验证。

Study on the Theory of Active Sound Control for Distributed Source

The theory of spatial active sound control plays an important role in the realizing of active sound con-trol.In this paper,by assuming the total sound pressures are zero in far field,a formula which sets a rela-tionship between the complex strengths of secondary sources and the directivity of the distributed primarysource is obtain.If the directivity of the primary source is known,the optimal values of complex strengthsof secondary sources for the realization of active sound control can be yielded.As a special case of this e-quation,when the primary source is a set of point monopole sources,the expression of secondary sourcecomplex strengths for minimizing the total power output which is given by P.A.Nelson can also be de-rived.It indicates that the formula presented by this paper is of more universal significance.These resultsare verified by simulation.