谐振梁式测力传感器动态参数识别

Dynamic Parameter Identification of Resonator Force Senser

用光通量变化法非接触地记录了小型谐振式力传感器中的谐振梁的自由响应信息,并根据多点同时采集的时间域信号,利用时间域系统识别技术,进行了结构动态参数的识别。还与全息时间平均法、声测法进行了对比。结果分析表明三种方法测量的梁的前几阶固有频率一致,振型相近,并从识别的阻尼比中计算出了谐振梁的Q值。

The method of luminous flux change is used to record the free response of the resonating beam in the small resonating beam force sensor by Non-contact measurement, and in terms of the time domain signals collected simultaneously at the multiple points. System identification techniques are used in the time domains to identify the dynamic parameters. Furthermore, time-averaging holography and sound identification method are employed to identify the dynamic parameters. The results of the lower-order natural frequencis and modes are quite consistent. The results not only provide a basis for sensor design but also prove that the three methods are efficient ways to identify dynamic parameters of small or mini-small objects.