【摘要】 基于声辐射模态理论进行ASAC控制系统中的一个重要内容就是获得声辐射模态伴随系数。以简支板为例,设计了一种新的PVDF(POLYVINYLIDENE FLUORIDE聚偏氟乙烯)压电传感器,用来测量板的前3阶声辐射模态伴随系数。由仿真计算结果表明,在中低频率,测量第一阶声辐射模态伴随系数时,只需要在板布置两条PVDF传感器即可;测量第二、三阶声辐射模态伴随系数时,可在板上布置多条传感器能得到比较精确的结果。同时PVDF传感器测量的结果与理论相符,说明这种新型PVDF压电传感器的设计是可行的。更多还原

【Abstract】 It is important in ASAC system based on acoustic radiation modes to obtain adjoint coefficient of the radiation modes. For a simply supported plate, a new piezoelectric sensor strategy is presented to measure the adjoint coefficients of the first 3 radiation modes. At low frequency range, it is shown from the numerical simulations that two PVDF (polyvinylidene fluoride) sensors are enough to measure that of the first radiation mode and more PVDF sensors are needed to measure that of the second and third radiation modes. The results measured by the PVDF sensors are in concordance with the theoretical results and the new piezoelectric sensor strategy is available.更多还原