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首页> 外文期刊>SAE International Journal of Vehicle Dynamics, Stability, and NVH >Experimental Realization of a Sound Radiation Filter for Feedforward Control to Improve Active Structural Acoustic Control Systems
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Experimental Realization of a Sound Radiation Filter for Feedforward Control to Improve Active Structural Acoustic Control Systems

机译：实验实现声辐射前馈控制滤波器改善活动结构声学控制系统

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摘要

Due to the strengthened CO_2 and NO_x regulations, future vehicles have to be lightweight and efficient. But, lightweight structures are prone to vibrations and radiate sound efficiently. Therefore, many active control approaches are studied to lower noise radiation besides the passive methods. One active approach for reducing sound radiation from structures is the active structural acoustic control (ASAC). Since the early 90's, several theoretical studies regarding ASAC systems were presented, but only very little experimental investigations can be found for this alternative to passive damping solutions. The theoretical simulations show promising results of ASAC systems compared to active vibration control approaches. So, for that reason in this paper an experiment is conducted to investigate the performance of an ASAC system in the frequency range up to 600 Hz. A regular sensor grid of 24 accelerometers that are interconnected to establish six radiation signals is applied to an aluminum plate. The plate is excited by a point force and the feedforward control system counteracts these vibrations with 2 inertial actuators. The radiated sound power can be reduced by 4 dB integrated over the targeted frequency band. Compared to an active vibration control system which results only in a 0.2 dB decreased sound radiation, the ASAC system is beneficial. Furthermore, the filter length and the causality aspect of the experiments are analyzed in order to investigate the digital signal processing requirements. It can be shown that short filters are sufficient for an ASAC system compared to the filter length needed for an AVC system. In the last part of this paper some technical simplifications are investigated in order to reduce the complexity of the sound radiation filters. It is shown that the high pass filters needed to model the radiation efficiency can be neglected with a very small loss of performance.
机译：由于加强了二氧化碳和NO_x的规定,未来的车辆必须是轻量级的非常高效。振动和辐射有效地声音。因此,许多主动控制方法除了研究降低噪声辐射被动的方法。从结构声辐射是活跃的结构声学控制(ASAC)。90年代初,一些理论研究有关ASAC系统被提出,但只有很少的实验调查可以发现替代被动阻尼的解决方案。理论模拟显示的有前景的结果ASAC系统相比,主动振动控制方法。实验进行了探讨性能ASAC系统的频率600赫兹范围。加速度计是相互关联的建立六个辐射信号应用于一个铝板。力和前馈控制系统抵消这些振动2惯性执行机构。减少4 dB集成目标频带。控制系统,结果只有0.2 dB降低声辐射,ASAC系统有益的。因果关系方面的实验为了研究数字分析信号处理的要求。这短ASAC过滤器是足够的系统所需的滤波器长度相比一个AVC系统。一些技术简化了为了减少复杂的声音辐射过滤器。过滤器需要模型的辐射效率可以被忽视的一个非常小的损失的性能。

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