Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong.
J Acoust Soc Am. 2011 Apr;129(4):1991-2004. doi: 10.1121/1.3552873.
The work proposed an optimization approach for structural sensor placement to improve the performance of vibro-acoustic virtual sensor for active noise control applications. The vibro-acoustic virtual sensor was designed to estimate the interior sound pressure of an acoustic-structural coupled enclosure using structural sensors. A spectral-spatial performance metric was proposed, which was used to quantify the averaged structural sensor output energy of a vibro-acoustic system excited by a spatially varying point source. It was shown that (i) the overall virtual sensing error energy was contributed additively by the modal virtual sensing error and the measurement noise energy; (ii) each of the modal virtual sensing error system was contributed by both the modal observability levels for the structural sensing and the target acoustic virtual sensing; and further (iii) the strength of each modal observability level was influenced by the modal coupling and resonance frequencies of the associated uncoupled structural/cavity modes. An optimal design of structural sensor placement was proposed to achieve sufficiently high modal observability levels for certain important panel- and cavity-controlled modes. Numerical analysis on a panel-cavity system demonstrated the importance of structural sensor placement on virtual sensing and active noise control performance, particularly for cavity-controlled modes.
该工作提出了一种结构传感器位置优化方法，以提高用于主动噪声控制应用的声振虚拟传感器的性能。声振虚拟传感器用于使用结构传感器估计声结构耦合封闭体的内部声压。提出了一种谱-空域性能指标，用于量化由空间变化点源激励的声振系统的结构传感器输出能量的平均值。结果表明：(i) 整体虚拟传感误差能量由模态虚拟传感误差和测量噪声能量相加得到；(ii) 模态虚拟传感误差系统中的每一个模态虚拟传感误差均由结构传感和目标声学虚拟传感的模态可观测性水平共同贡献；进一步 (iii) 模态可观测性水平的强度受相关非耦合结构/腔模态的模态耦合和共振频率的影响。提出了一种结构传感器位置的最优设计方法，以实现某些重要的面板和腔控模态的足够高的模态可观测性水平。对板腔系统的数值分析表明了结构传感器位置对虚拟传感和主动噪声控制性能的重要性，特别是对腔控模态。
