摘要
为了解决传统磁流体加速度传感器体积大、灵敏度低、线性度差、使用频率范围低等缺点,设计了一种新型磁流体加速度传感器。采用圆柱形永磁铁作为惯性质量,将加速度转化为磁场的变化,利用高灵敏度线性霍尔检测磁场变化,从而实现加速度到电信号的转变。通过仿真和实验分别对磁流体的悬浮效应、阻尼效应以及圆柱形永磁铁的磁场分布情况进行了研究,结果表明:在永磁铁体积较小的情况下,永磁铁受到的悬浮力很小;在磁场作用下,磁流体具有非常优越的阻尼性能。基于永磁铁的磁场分布情况的研究结果,选取磁场变化梯度最大且线性度最好的位置安装霍尔元件,从而提高传感器灵敏度。利用振动实验台,对所设计的传感器性能进行实验验证,结果表明,新型磁流体加速度传感器具有较好的线性度和较大的可用频率范围,在其他结构不变的前提下,磁流体的使用将加速度传感器的可用频率范围提高了256%。本文为研究磁流体的悬浮效应和阻尼效应提供了一种策略,也为加速度传感器的研究和改进提供了一种新的思路。
To solve the shortcomings of the traditional magnetic fluid inertial sensors,such as large volume,small sensitivity,low linearity and narrow available frequency domain,a novel magnetic fluid inertial sensor is designed.A cylindrical permanent magnet serves as the inertial mass to transform the acceleration value into the change of the magnetic field.Linear Hall sensor with high sensitivity is used to detect the change of the magnetic field,thus the acceleration is transferred to the electrical signal.By simulation and experiment,the suspension effect,damping effect of magnetic fluid and the distribution of the magnetic field of a cylindrical permanent magnet are investigated.It is verified that the suspension force is slight in the case that permanent magnet volume is small and the magnetic fluid has excellent damping effect under the action of magnetic field.The position of the maximum gradient and the best linearity of the magnetic field are found to install the Hall sensor.The experiments show that the novel magnetic fluid accelerometer has better linearity and wider available frequency range.The added magnetic fluid widens the frequency range of the acceleration sensor by 256%.
作者
张西宁
夏心锐
向宙
张雯雯
ZHANG Xining;XIA Xinrui;XIANG Zhou;ZHANG Wenwen(State Key Laboratory for Manufacturing Systems Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2019年第2期1-8,79,共9页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51275379)
国家自然科学基金创新研究群体资助项目(51421004)
关键词
加速度传感器
磁流体
霍尔元件
永磁铁
inertial sensor
magnetic fluid
Hall sensor
permanent magnet
