摘要
以简支矩形薄板为研究对象,首先在波数域内对结构振动体积速度与辐射声功率的关系进行分析,推导出反映结构模态对体积速度贡献规律的数学表达式。在此基础上,结合PVDF压电薄膜的电荷输出方程,利用三角函数的正交性,给出一种新方法来设计体积速度传感器,并针对具体模型进行了结构体积速度测量实验研究。结果表明,所设计的分布式体积速度传感器具有较好的传感精度,进而说明了方法的正确性。同时还发现PVDF压电薄膜制作工艺与粘贴位置的偏差对其传感精度在一定频带内有较大影响,并且对不同位置激励下传感的影响程度不同。
Under the assumption that a simply supported rectangular plate is an analytical model, firstly the relationship between structural surface volume velocity and sound power radiated by the plate is analyzed in the wave-number domain, and the mathematical expressions indicating the contribution proportion of structural mode to the volume velocity is derived. Based on these results, combined with charge output equation of the PVDF piezoelectric film and orthogonal property of trigonometric function, a novel design methodology for volume velocity sensor is presented, and an experiment for measuring structural volume velocity on a concrete model is conducted. The results show that the distributed volume velocity sensor has a better sensing accuracy. The validity of this approach is further verified. It is also observed that the deflections of the PVDF sensor shaping and bonding position have obvious effect on sensing accuracy, and the extent of effect on sensing under different excited conditions is different.
出处
《振动工程学报》
EI
CSCD
北大核心
2008年第3期235-240,共6页
Journal of Vibration Engineering
基金
哈尔滨市培养学科后备带头人基金项目(2004AFXXJ034)
关键词
结构声有源控制
分布式压电传感器
体积速度
测量实验
active structural acoustic control
distributed piezoelectric sensor
volume velocity
measuring experiment
