Monitoring dynamic displacement of centrifugal inertia mechanism

离心惯性机构动态位移监测

School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Received: 14 November 2024

Abstract

To monitor the motion state of the inertial mechanism of a fuze in real-time, this paper combines optical image acquisition and electrical measurement. The working principles of a single-degree-of-freedom spring-mass block is analyzed theoretically. The composition of the inertial mechanism is determined, and the working principles of the optical image acquisition and the electrical detection module of the Hall sensor are proposed. At the same time, the centrifugal test platform and the Hall sensor displacement calibration platform are established. Through the rotation transformation, gray processing, Gaussian filtering and image recognition of the collected images, the automatic extraction of the displacement of the inertial mechanism in its rotational state is realized. By interpolating and filtering the voltage data of the Hall sensor, the speed curve and the slide block displacement curve are obtained. The experimental and simulated displacement curves are compared. The results show that the displacement curves obtained by optical image acquisition and electrical measurement are consistent with the trend of the simulated displacement curve. Optical image acquisition and the Hall sensor's electrical measurement can accurately monitor the real-time displacement change of the inertial mechanism in an accelerated centrifugal state.

摘要

为了实时监测引信惯性机构的运动状态, 采用光学图像采集和电测相结合的方法对惯性机构运动状态进行实时监测。理论上分析了单自由度弹簧质量块的工作原理。确定了惯性机构组成, 提出了光学图像采集与霍尔传感器电学检测模块工作原理, 同时建立了离心试验装置平台与霍尔传感器位移标定平台。通过对采集图像的旋转变换、灰度处理、高斯滤波与图像识别等处理, 实现了旋转状态下惯性机构位移的自动提取; 通过对霍尔传感器电压数据进行插值、滤波等, 得到了转速曲线与滑块位移曲线。将试验与仿真位移曲线进行对比, 结果表明光学图像采集与电测所得位移曲线与仿真位移曲线趋势一致。光学图像采集与霍尔传感器电测在加速离心状态下能够精确监测惯性机构在离心状态下的实时位移变化。