基于虚拟误差传感的大尺度空间有源降噪性能研究

Performance of active noise reduction in large-scale space based on virtual error sensing

针对大尺度空间有源降噪系统误差传声器布放位置受限问题,本文使用虚拟误差传感在降噪目标区域放置多个虚拟误差传声器,将静音区由物理误差传声器点转移至虚拟误差传声器点,扩大降噪目标区域中静音区范围。为了对降噪性能及影响因素进行分析与研究,给出多通道虚拟误差传感的原理和算法,对降噪性能及物理与虚拟误差传声器的数量和布放等因素进行仿真分析,在飞机模型舱内进行实验验证。仿真及实验结果表明:使用虚拟误差传感有利于增大降噪目标区域降噪量及静音区;物理与虚拟误差传声器的布放影响静音区的分布;合理的物理与虚拟误差传声器数量及布放可以扩大静音区使其100%覆盖降噪目标区域,最优数量与初级声场频率特性相关。

Aimed at the problem of limited placement of error microphones in large-scale spatial active noise reduction systems,this paper used the virtual error sensing technology to place multiple virtual error microphones in the noise reduction target area,and transferred the quiet zones from the physical error microphone points to the virtual error microphone points,expanded the range of the quiet zones in the noise reduction target area.In order to analyze and study the noise reduction performance and influencing factors,the principle and algorithm of multi-channel virtual error sensing were given first,and then the noise reduction performance and the number and placement of physical and virtual error microphones ware simulated and analyzed.Finally,the noise reduction performance and influencing factors were verified experimentally in a model cabin of a turboprop aircraft.The simulation and experimental results show that the used virtual error sensing was beneficial to increase the average noise reduction and quiet zone of the target noise reduction area,the placement of the physical and virtual error microphones directly affects the distribution of the quiet zones,a reasonable number and placement of physical and virtual error microphones can expand the quiet zones to cover the noise reduction target area 100%,and the optimal number of error microphones was related to the noise frequency characteristics of the primary sound field.