| The Heart Beat Flow Experiment System is an in vitro experimental platform built to simulate human blood circulation.The linear drive device is the core component of the system,providing pulsatile flow for the left heart system during systole and diastole.Due to the complexity of the human body’s internal environment,the study of cardiovascular disease and the evaluation of extracorporeal experimental devices rely mainly on the Heart Beat Flow Experiment System.Linear motors are currently the most widely used driving devices in the system,consisting of a linear motor and piston.However,current cylindrical linear motors cannot meet the requirements of load,displacement,and response speed of the driving device for the Heart Beat Flow Experiment System.Furthermore,other researchers’ designed systems have not been able to accurately simulate the hemodynamics of the left heart system.To solve these problems,this article proposes a linear motor design suitable for the Heart Beat Flow Experiment System,which was developed through structural and magnetic analysis.Additionally,a feedback + second-order feedforward control method is proposed to improve the control system’s response speed while maintaining system stability.To address the challenge of complex parameter tuning in composite control,particle swarm optimization is used to tune the parameters.The resulting motor and control algorithm can meet the requirements of the Heart Beat Flow Experiment System while improving the control system’s response speed and position tracking accuracy.This research provides theoretical and experimental evidence for accurate simulation of left heart system flow characteristics and can provide references for the design and control of similar linear motor devices.The main content of this article includes:1、A review of the development and research status of driving methods and pulsatile linear motor technology for the Heart Beat Flow Experiment System.2、An analysis of the system’s overall design requirements for drive device structure size and installation method,as well as the load force and motion required to simulate left ventricular pressure and volume parameters under three physiological conditions(healthy,exercise,and heart failure).3、The design of a pulsatile linear motor structure that meets the requirements for the Heart Beat Flow Experiment System and finite element simulation to validate the model’s design.4、The establishment of a mathematical model of the pulsatile linear motor and the proposal of a second-order feedforward composite control algorithm that considers the system’s performance requirements for overshoot,static error,and response speed.Particle swarm optimization is used for composite control parameter tuning.5、Joint simulation of the Heart Beat Flow Experiment System using the designed pulsatile linear motor model in Simulink and hydraulic system model in AMESim,as well as experimental verification using LabVIEW-based composite control and signal acquisition software for three physiological conditions.Overall,this article aims to propose a suitable pulsatile linear motor design and control method for the Heart Beat Flow Experiment System and provide theoretical and experimental evidence for its effective implementation. |
PDF Full Text Request