The Active Minimization of Harmonic Enclosed Sound Fields
The Active Minimization of Harmonic Enclosed Sound Fields
复制标题
谐波封闭声场的主动最小化
DOI：
10.1007/978-3-642-82758-7_9
复制
发表时间：
1986
期刊：
影响因子：
--
通讯作者：
S. Elliott
中科院分区：
文献类型：
--
作者：
P. Nelson;A. Curtis;S. Elliott
稳态谐波声场中的总时间平均声学势能可以表示为引入到封闭空间中的许多“次级声源”的复强度的正定二次函数。对于给定数量和位置的二次源，有一组独特的复杂的源强度，最大限度地减少这种潜在的能量。这种分析适用于一个轻微的阻尼外壳的情况下，由一个点的主要来源在一个频率远高于施罗德大房间频率。它表明，在这种情况下，可以实现在声场的势能的最大减少是至关重要的主要和次要来源的相对位置依赖。
The total time averaged acoustic potential energy in a steady harmonic sound field can be expressed as a positive definite quadratic function of the complex strengths of a number of “secondary sources” of sound introduced into the enclosure. For a given number and location of secondary sources, there is a unique set of complex source strengths which minimises this potential energy. This analysis is applied to the case of a lightly damped enclosure excited by a point primary source at a frequency well above the Schroeder large room frequency. It is demonstrated that in this case, the maximum reduction that can be achieved in the potential energy of the sound field is critically dependent on the relative locations of primary and secondary sources.