一种振弦采集仪自适应扫频激振方法

摘要

针对现有振弦采集仪由于低压扫频过程持续时间长而导致工作可靠性差的问题，提出了一种自适应扫频激振方法，通过调整扫频脉冲序列的递增步长将激振过程分为预扫频激振与复扫频激振两个阶段，基于反馈策略实现了在传感器工作参数未知下的自适应扫频激振。其中，复扫频激振基于预扫频激振反馈数据自适应设定扫频工作范围，并减小扫频脉冲序列的递增步长以提高测量精度。同时，为提高了测量数据的准确性，进行了扫频激振的可靠性检验。实验证明了文中方法的有效性。%Aiming at the reliability problem led by the long duration of swept-frequency excitation in the existing VW sensor data acquisition instrument,an adaptive swept-frequency exciting method was proposed,which divides the exciting process into pre-exciting phase and post-exciting phase by adjusting the increment step of swept-frequency sequence. With the feedback strategy,a-daptive excitation for VM sensor was achieved without the sensor working parameters. To do this,the swept-frequency range of post-exciting phase was adaptively set based on the feedback data of pre-exciting phase,and the swept-frequency increment step was re-duced to improve the measurement precision. Moreover,the reliability of swept-frequency excitation was tested to improve the accu-racy of measurement data. The effectiveness of the proposed method is proved by experiment results.