Researchers at Beijing Jiaotong University have developed a composite control scheme for high-speed electromagnetic suspension (EMS) trains to effectively suppress track irregularities. The maglev train, known for its technical advantages such as low noise, environmental-friendliness, and high comfort, achieves non-contact suspension and guidance through electromagnetic force. However, track irregularities can still impact the train’s stability during operation.
The study, published in the journal High-speed Railway, addresses this issue by proposing a novel control scheme for EMS trains. The researchers focused on two types of disturbances: harmonic interference caused by track roughness and lumped disturbances in the input channel. To estimate these disturbances accurately, they used a disturbance observer and an extended state observer, respectively.
The refined disturbance observer proved effective in estimating track irregularities and lumped disturbances, even in the presence of uncertainties and external disturbances. To compensate for disturbances within a specific timeframe, the researchers designed a prescribed performance fixed-time controller (PPFTC). This controller restricted the suspended air gap error using prescribed performance control, ensuring the safety and accuracy of the control law.
Simulation results demonstrated that the proposed control scheme significantly improved the suspension air gap response and enhanced overall stability during train operation. The researchers believe that further exploration is needed to understand the impact of high-speed compressed air flow between the vehicle body and the track on the suspension system. They also suggest extending the control algorithm to other components of the train, such as semi-bogies or full bogies, to validate its effectiveness on testing lines in future research.
This research contributes to the ongoing efforts to advance high-speed EMS trains, improving their stability and performance. With the potential for reduced track-related disturbances, these advancements could further enhance the efficiency and comfort of maglev train transportation systems.
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1. Source: Coherent Market Insights, Public sources, Desk research
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