Electromagnetic Air Spring Control for Rail Vibration Isolation
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Solution Overview
Problem
Existing air springs in rail vehicles employ a passive anti-vibration mode, which results in poor anti-vibration performance and a short service life due to the constant operating state of the auxiliary spring, affecting the operation reliability of the vehicle.
Innovation Solution
The air spring incorporates an electromagnetic levitation module and a detection module, enabling an active anti-vibration function. The electromagnetic control module adjusts the electromagnetic forces to counteract vertical vibrations, and the auxiliary spring design with multiple rubber pads ensures load distribution and safety in failure modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the auxiliary spring is in a constant operating state, then the air spring can provide emergency support, but the load borne by the auxiliary spring changes greatly and the service life is short
Solution Approach 1:
The patent substitutes the constantly working mechanical auxiliary spring with an electromagnetic levitation system that actively manages load bearing. The electromagnetic forces replace the mechanical spring's constant operation, allowing the auxiliary spring to remain in a low-stress state during normal operation and only engage when needed, thereby extending its service life while maintaining emergency support capability.
Solution Approach 2:
The auxiliary spring transitions from continuous operation to periodic or conditional operation based on system needs. During normal operation, electromagnetic forces handle the load; the auxiliary spring only activates periodically or conditionally during failure modes. This periodic action pattern reduces cumulative stress and extends service life while preserving emergency support functionality.
2Device complexity
If the air spring uses a passive anti-vibration mode with diaphragm and auxiliary spring, then the structure is simple, but the anti-vibration performance is poor
Solution Approach 1:
The patent replaces the simple passive mechanical system with an active electromagnetic control system. The electromagnetic levitation module and control unit add complexity but deliver superior anti-vibration performance through active control. This resolves the contradiction by prioritizing performance over simplicity, using electromagnetic fields and intelligent control to achieve better vibration suppression than passive mechanical designs.
Solution Approach 2:
The electromagnetic levitation module serves multiple functions: it provides the primary anti-vibration force, acts as a load-bearing mechanism, and enables intelligent control of the air spring's behavior. This multi-functionality compensates for the increased structural complexity by consolidating multiple roles into a single integrated system, achieving superior performance without proportionally increasing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The air spring achieves improved anti-vibration performance with an active control system, extending the service life of the auxiliary spring and enhancing the reliability and safety of the rail vehicle, while maintaining low failure rates.
Implementation Method 1
an electromagnetic levitation module comprising a first coil (51) and a second coil (52) which can be energized to generate electromagnetic forces
Implementation Method 2
the anti-vibration effect is achieved by air compression in the diaphragm
Implementation Method 3
the auxiliary spring design with multiple rubber pads ensures load distribution and safety in failure modes
Data Source
Figure 1~2
Figure 3
AI summary
The present application provides an air spring, comprising an upper cover; a lower cover including a cover plate arranged opposite to the upper cover at intervals and a support part connected below the cover plate; a diaphragm arranged between the cover plate and the upper cover; a base connected with the support part; an electromagnetic levitation module including a first coil and a second coil that are able to be energized; a detection module including a first load senor configured to detect the vertical load borne by the air spring and a first height sensor configured to detect a height difference; and an electromagnetic control module electrically connected with the electromagnetic levitation module and the detection module respectively and configured to receive detection signals from the detection module and control the electromagnetic levitation module according to the detection signals.