基于滤波最小均方算法的簇绒地毯装备噪声主动控制

为降低纺织车间簇绒地毯装备的低频噪声,将噪声主动控制的滤波最小均方算法 (FXLMS)引入纺织机械噪声控制领域。以英国柯贝尔 1/8针距簇绒地毯织机为研究对象,建立了噪声主动控制系统模型,根据现场情况布置传感-作动单元;并运用双传声器离线通道辨识方法估计初级和次级通道传递函数;针对前馈控制策略引起的次级声反馈现象,选用参量阵扬声器作为次级声源减轻该现象对噪声控制系统稳定性的影响。最后对簇绒地毯织机噪声的主动控制仿真研究和实验验证了该方法的可行性和有效性。实验结果表明:簇绒地毯织机采用的主动噪声控制方法对低频段噪声的控制效果较中高频段好,簇绒地毯织机噪声主要频率点的噪声消声量最大可达9.8 dB。

Active noise control for tufted carpet equipment based on filtered least mean square algorithm

In order to reduce tufted carpet equipment's low frequency noise, this paper introduces the filtered least mean square algorithm (FXLMS) for textile machinery noise control. The active noise control system model was established to complete the sensor-actuator arrangement taking the British COBBLE 1/8-pitch tufted carpet loom as the research object. The dual-microphone offline channel identification method was used to estimate the primary and secondary channel transfer functions. For the secondary acoustic feedback phenomenon caused by the elected feed-forward control system, the parametric array speaker was used to reduce the influence on stability of the noise reduction experiment as secondary acoustic source. The noise reduction simulation and experiment of the tufted carpet loom verified the feasibility and effectiveness of the proposed method. The experimental results show that the active noise control method used in tufted carpet loom has better effect on low-frequency noise control than medium and high frequency noise control, and the noise cancellation at the main frequency point reaches 9.8 dB.