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基于平面声源的三层有源隔声结构系统易于实现且具有良好的低频隔声性能,实现该系统需解决的关键问题是误差信号的检测.本文将压电传感薄膜聚偏氟乙烯(polyvinylidene fluoride,PVDF)阵列检测简支梁辐射模态的理论拓展到二维结构,并应用到三层隔声结构实现误差传感的优化设计.根据三层结构中特殊的能量传输规律,对误差传感方案中目标函数的选取、PVDF数目确定以及传感系统优化等问题进行深入分析.研究表明,由于辐射板能量主要集中在有限个振动模态上,只需将少数经固定系数加权的PVDF薄膜输出电流求和即可获得前三阶辐射模态幅值.辐射模态幅值的检测值与理论值符合良好,保证传感精度的同时有效简化了系统.
The three-layer active acoustic structure system based on planar sound source is easy to realize and has good low-frequency sound insulation performance. The key problem to be solved in this system is the detection of error signal.In this paper, piezoelectric sensing film polyvinylidene fluoride polyvinylidene fluoride (PVDF) array to detect the two-dimensional structure of the beam, and applied to three-layer sound insulation structure to achieve the optimal design of error sensing.According to the special law of energy transmission in the three-layer structure, the error The selection of the objective function in the sensing scheme, the determination of the number of PVDF and the optimization of the sensing system, etc. The research shows that due to the radiation energy concentrated on a limited number of vibration modes, only a few fixed-coefficient-weighted PVDF The sum of the thin film output current can be obtained the first three orders of radiation mode amplitude.The detection value of the radiation mode amplitude in line with the theoretical value of good, to ensure that the sensor accuracy while simplifying the system effectively.