主动模拟肺的运动及控制部分仿真研究

Control and Movement Portions of Active Servo Lung Simulation Research

目的:对于基于主动模拟肺的呼吸机测试平台的运动及控制部分进行分析与仿真研究,为进一步研究和功能扩展打下基础。方法:对步进电动机、丝杠滑台和活塞摩擦力的数学模型进行分析,在 SimuLink 内建立仿真模型,采用PID 控制方法实现步进电动机控制,使用纤维肺的呼吸数据进行模拟,对控制和运动模型进行分析。结果:经过初步的仿真模拟,所设计的控制及运动模型能够实现较为准确的控制,实现初步的呼吸运动仿真。结论:所建立的主动模拟肺的运动和控制部分的数学模型及仿真模型能够较真实地反映控制及运动规律,基于这一仿真模型可以实现主动模拟肺的运动及控制模拟,同时为下一步各种呼吸模型的建立提供良好的分析平台。

Objective The ventilator test system based on active servo lung can assessment the performance of ventilator under different conditions. The analysis and simulation of the motion and control portions are necessary during designing of this system. These studies will provide guidance on system designing, creation different respiratory model, and also lay a solid foundation for further research and functionally expansion. Methods We analyzed the mathematical model of the stepper motor, screw, sliding table and piston friction. Then, the simulation model was established in the SimuLink, using the PID for the stepper motor. Finally, the breathing data of a fibrotic patient was test on the simulation model. Results After initiative tests, the simulation model achieve relative accurate control and can achieve the initial respiratory motion simulation. Conclusion The simulation model established can reflect the real movement and control of the active servo lung. This model can take the initiative simulation lung movement, and provides a good analysis platform for next step study.