基于阶次分析的主动声品质控制

Active Sound Quality Control Based on Order Analysis

传统的主动噪声控制(ctive noise control,ANC)主要是以频率谱分析为主以降低车内噪声声压级为控制目标。发动机噪声是车内低频噪声的主要来源,分为结构噪声和辐射噪声两类,发动机产生的低频噪声在升速或降速过程中处于非稳定状态,阶次分析是一种有效的非稳定信号的分析方法。单纯采用声压级作为车内声的评价标准忽略了人的主观感受。因此,采用声压级、响度作为车内声品质的评价标准,并搭建了基于主动噪声均衡控制(active noise equalizer,ANE)的主动声品质控制系统,经过仿真对比得出:提出的阶次主动控制结构可以改善车内声品质。

The traditional active noise control （Active noise control, ANC） is mainly based on frequency spectrum analysis to reduce the noise level of the interior noise as the control target. Engine noise is the main source of low-frequency noise in the car. It is divided into two types： structural noise and radiated noise. The low-frequency noise generated by the engine is in an unstable state during acceleration or deceleration. The order analysis is an effective unsteady signal analytical method. The sound pressure level is simply used as the evaluation standard of the car interior but it ignores the subjective feelings of people. In this paper, the sound pressure level and loudness are used as the evaluation standard of the sound quality in the car and the active sound quality based on the active noise equalizer （Active noise equalizer,ANE） is built. The control system is simulated and compared： it shows that the order active control structure proposed in this paper can improve the sound quality of the interior noise.