柔性激振的频响函数法损伤检测数据获取系统

Damage Detection Data Acquisition System with Flexible Vibration Excitation Using Frequency Response Function Method

传统的基于频响函数的损伤检测系统无法实现激振检振的软件控制,检测过程中需要不断地移动激振器的位置,进而造成测试过程耗费大量时间,检测速度慢、效率低。为此提出了一种柔性激振的频响函数法损伤检测数据获取系统。着重介绍了基于数字I/O和开关阵列的柔性激振16路数据获取系统的激振检振一体化检测器和阵列开关等系统前端的设计,实现了16路单通道轮流激励的软件柔性控制。并基于虚拟仪器技术和Lab VIEW软件平台开发了系统控制软件。实验验证表明,系统满足频响函数检测法数据获取要求,运行可靠稳定,操作方便,控制灵活简便。设计的柔性激振检振系统将在声定位、震源定位、弹性波CT等领域中有广阔的应用前景。

Traditional damage detection system based on frequency response function is unable to realize the software control of excitation and detection of vibration,and in the process of detection it needs constantly to move the position of the vibrator,causing that the test process is time-consuming,having low speed and low efficiency,thus to solve this problem,this paper proposes a damage detection data acquisition system based on frequency response function method with flexible vibration. The design of detector integrated vibration excitation and detection,as well as the design of array switch and other front-end of the system based on digital I/O and switch arrays are emphatically introduced,realizing the flexible software control of single channel vibration in turn for 16 channels.Besides,the control software system is developed based on the virtual instrument technology and the Lab VIEW software platform. Experiments show that,the system can meet the demand of test data acquisition for frequency response function method and it can run reliably and stably. It can be easily and flexibly operated and controlled. At the same time,the designed system with flexible vibration excitation and detection still has broad application prospects in sound positioning,source location,elastic wave CT and other fields.