Research on Real-Time Monitoring and Performance Optimization of Suspension System in Maglev Train
Abstract
:1. Introduction
- A framework for performance monitoring and performance optimization of the suspension system in maglev train is proposed. The framework consists of a nominal controller, a residual generator and a dynamic compensator. The nominal controller is used to stabilize the system and achieve tracking performance. The residual generator realizes the performance monitoring of the system and the dynamic compensator is used to realize the performance compensation and recovery;
- The observer-based residual generator is identified offline based on the data-driven method. The offline identification method does not need to know the accurate model of the system. During the operation of the system, the residual signal generated by the residual generator is monitored to distinguish disturbances and degradations of the suspension system, which provides strong support for performance evaluation and performance optimization;
- A data-driven performance optimization algorithm for the suspension system is designed. The algorithm can optimize the control performance of the system online when the system performance is unsatisfactory or even degraded;
- The validity of the proposed framework and algorithm is verified on a single suspension experimental platform.
2. Preliminaries
2.1. Data-Driven Residual Generator
2.2. Controller Based on Residual Generator
- The residual generator is integrated in the system and residual signal is generated in the operation, which can be used for process monitoring and further optimization of the controller;
- guarantees the stability of the closed-loop system. When is stable, the design of does not affect the stability of the system;
- When the system is subjected to unmodeled disturbances that cause changes in the input structure, will be activated to compensate system disturbance. When the system performance is degraded, is updated iteratively to restore the performance loss of the system.
3. Modelling and Nominal Controller of Suspension System
3.1. Model of Suspension System
3.2. Nominal Controller
4. Real-Time Performance Monitoring and Performance Evaluation
4.1. Problem Formulation
4.2. Realization of Data-Driven Residual Generator
4.3. Performance Evaluation and Classification
- Tiny degradation:. The degradation may be caused by parameter changes or external interference. Through the feedback control of the nominal controller, the train can still run safely and stably without any additional measures;
- Medium degradation: . This may be caused by changes in the component parameters of the suspension system (such as large load fluctuations, track irregularities, etc.). If medium degradation occurs, there is no need to stop the maglev train for overhaul, and one only needs to activate the online performance optimization algorithm;
- Severe degradation: or . This may be caused by component failure of the suspension system. At this stage, the train is very prone to breakdowns. At this time, the maglev train should be stopped and overhauled as soon as possible to prevent major safety accidents.
5. Control Performance Optimization Architecture
5.1. Quadratic Performance Index
5.2. Iterative Update of Parameter
6. Experimental Verification and Analysis
6.1. Experimental Device
6.2. Observer and Performance Optimization
7. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Conflicts of Interest
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Time | Peak | Dead Time | Adjustment Time | |
---|---|---|---|---|
0.00749 | 3.140 | 3.642 | 0.1576 | |
0.00743 | 3.069 | 3.592 | 0.1444 | |
0.00740 | 3.256 | 3.781 | 0.3617 | |
0.00742 | 2.954 | 3.491 | 0.1320 |
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Zhou, X.; Wen, T.; Long, Z. Research on Real-Time Monitoring and Performance Optimization of Suspension System in Maglev Train. Appl. Sci. 2021, 11, 11952. https://doi.org/10.3390/app112411952
Zhou X, Wen T, Long Z. Research on Real-Time Monitoring and Performance Optimization of Suspension System in Maglev Train. Applied Sciences. 2021; 11(24):11952. https://doi.org/10.3390/app112411952
Chicago/Turabian StyleZhou, Xu, Tao Wen, and Zhiqiang Long. 2021. "Research on Real-Time Monitoring and Performance Optimization of Suspension System in Maglev Train" Applied Sciences 11, no. 24: 11952. https://doi.org/10.3390/app112411952
APA StyleZhou, X., Wen, T., & Long, Z. (2021). Research on Real-Time Monitoring and Performance Optimization of Suspension System in Maglev Train. Applied Sciences, 11(24), 11952. https://doi.org/10.3390/app112411952