一种振弦式力传感器的设计与验证  

Design and Verification of a Resonant Chord Force Sensor

作　　者：冯一然 郑德智[2] FENG Yi-ran;ZHENG De-zhi(Beijing No.35 High School,Beijing 100032,China;School of Instrumentation Science and Opto-electronics Eng neering, Beihang University, Beijing 100191,China)

机构地区：[1]北京市第三十五中学,北京100032 [2]北京航空航天大学仪器科学与光电工程学院,北京100191

出　　处：《自动化与仪表》2018年第5期106-108,共3页Automation & Instrumentation

摘　　要：受弦式乐器启发,该文设计了一种振弦式力传感器,以一根恒弹振弦为敏感单元,测量力作用在振弦两端,通过检测振弦固有频率的变化实现力的测量。结构上,振弦的中间位置固定了钕铁硼磁铁,对应的支撑结构上,设计了电磁线圈。线圈由脉冲电信号控制产生脉冲力,实现振弦的自由衰减振动。同时,磁铁与线圈符合法拉第电磁感应原理,线圈中感应出与振弦振动频率相同的衰减振动信号。通过标定,建立了频率与力的函数关系,实现了力的测量。初步实验结果表明,该方法可实现力的测量,在10 N量程范围内,绝对测量精度可达±0.02 N。Inspired by chord instruments,a resonant chord force sensor is designed,with a constant-elastic vibrating chord as the sensitive unit,measuring force acting on both ends of the resonant chord,and measuring the force by detecting the change of the natural frequency of the resonant chord. Structure,the Nd Fe B magnet is fixed on the middle position of the resonant chord,the corresponding support structure,the electromagnetic coil is designed. The coil is controlled by the pulse signal to generate the pulse force and realize the free attenuation vibration of the resonant chord. At the same time,the magnet and coil accord with Faraday electromagnetic induction principle,and the attenuation vibration signal of the same vibration frequency is induced in the coil. The function relation between frequency and force is established by calibration,so the measurement of force is realized. The preliminary experimental results show that the method can measure the force,and the absolute measurement accuracy can reach ±0.02 N in the range of 10 N.

关 键 词：力传感器 谐振传感器 脉冲激励 固有频率 

分 类 号：TH823[机械工程—仪器科学与技术]