高精度机械振动频率测量仪研究(英文)  

Study on high precision cymometer of mechanical vibration

作　　者：张兴红[1] 何涛[1] 陈鑫[1] 邱磊[1] 

机构地区：[1]重庆理工大学时栅传感及先进检测技术重庆市重点实验室,重庆400054

出　　处：《机床与液压》2015年第6期43-48,共6页Machine Tool & Hydraulics

基　　金：supported by the Natural Science Foundation of Chongqing (Grant No.cstc2012jjA70004);the National Natural science Foundation of China (Grant No.51275551)

摘　　要：在机械设备的故障诊断中,频率是最重要的检测对象之一。很多机械设备在正常工作时,机械振动幅度较低,为了更方便、快捷地对设备的振动频率进行检测,根据能量守恒定律,设计了一种特殊的振动测量传感器,该传感器可对微弱的机械振动幅度进行机械放大,传感器顶部是一变极距式可变电容,电容的大小会随着电容器下极板的振动而改变,从而把被测非电量的变化转化为电信号的变化。在硬件处理电路中,采用全差分放大电路对电信号进行二次放大,利用模数转换器对二次放大的模拟信号进行采样。通过软件插补细分算法实现纳秒级精度的时间测量,从而实现高精度的频率测量。The detection of frequency is one of the most important aspects in the fault diagnosis of mechanical e- quipments. The amplitude of mechanical vibration is small when the mechanical equipment is in normal opera- tion. According to the law of conservation of energy, a kind of special vibration measuring sensor is designed which is a variable distance capacitive sensor and it can achieve mechanical vibration amplitude amplification. In the hardware processing circuit, a fully differential amplifier circuit is used to make secondary amplification of e- lectrical signal, and the amplified analog signal is sampled by high resolution ADC. Nanosecond precision time is achieved through software subdivision algorithm, so as to realize the high precision of frequency measurement.

关 键 词：振动测量传感器 电容电压转换 细分插补算法 精密测量 

分 类 号：TG502.14[金属学及工艺—金属切削加工及机床]