摘要
喷丸处理作为一种常用的金属表面强化工艺,通过喷丸流的冲击作用,能够有效增强材料的抗疲劳性能并延长其使用寿命。为实现抛丸机气喷钢丸流量的精准测控,研制了一种集检测与控制功能于一体的铁质喷丸流量测控装置。基于电磁场理论分析铁质喷丸流量检测原理,建立铁质喷丸对螺线管传感器磁场分布特性影响的等效模型,并通过有限元仿真进行功能验证。检测单元采用电感数字转换电路LDC1612,基于LC并联谐振实现铁质喷丸流量的采集,并通过周期性平均值滤波算法消除测量噪声。喷丸流量经控制单元PID运算输出控制信号,通过动态调节PWM信号的占空比,控制电磁阀的开闭时间,实现喷丸流量的闭环控制。实验结果表明,S330和S110喷丸流量与LC谐振频率差之间呈线性关系,喷丸流量与PWM信号占空比呈两段线性关系,拟合度均优于99.2%。S330喷丸流量检测精度达到±2.5%,S110喷丸流量检测精度达到±4.33%,验证了该测控系统的优异计量特性。
As a widely adopted surface strengthening technique for metals,shot blasting treatment can effectively enhances material fatigue resistance and extends service life by inducing compressive residual stresses through high-velocity shot impacts.To achieve precise measurement and control of the steel shot flow in shot blasting machine,a ferrous shot flow measurement and control device with integrated detection and control capabilities has been developed.The principle of ferrous shot flow detection was analyzed based on electromagnetic field theory,and an equivalent model describing the influence of ferrous shot flow on the magnetic field distribution characteristics of the solenoid sensor was established.This principle was validated through finite element simulation.The LDC1612 inductance-to-digital conversion circuit was adopted in the detection,data acquisition of ferrous shot flow rate was achieved based on the LC parallel resonance and the measurement noise was eliminated via a periodic average value filtering algorithm.The controller generates control signals based on the collected flow data through PID operation,while the control unit dynamically adjusts the duty cycle of the generated PWM signal to regulate the opening and closing time of the solenoid valve,thereby the closed-loop control of the shot flow was achieved.Experimental results demonstrated a linear relationship between the S330 and S110 shot flows and the difference in LC resonant frequency,as well as a two-segment linear relationship between the shot flow and the duty cycle of the PWM signal,with a fitting accuracy exceeding 99.2%.The detection accuracy for the S330 shot flow reaches±2.5%,and for the S110 shot flow,it reaches±4.33%,the excellent metrological performance of this integrated measurement and control system was confirmed.
作者
刘士兴
李航
李帮金
胡平辉
Liu Shixing;Li Hang;Li Bangjin;Hu Pinghui(School of Microelectronics,Hefei University of Technology,Hefei 230009,China)
出处
《电子测量与仪器学报》
北大核心
2025年第7期73-80,共8页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金重大科研仪器研制项目(62027815)资助。
关键词
铁质喷丸流量
螺线管传感器
电磁感应
电感数字转换
有限元仿真
ferrous shot flow
solenoid sensors
electromagnetic induction
inductive digital conversion
finite element simulation
