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Dynamic characterization and vibration response optimization of EMT system for tracked vehicles
Zhengda Han1, Xiaocong Liang2, Wei Zhang3,4
1School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Scientific Reports
|April 12, 2025
Summary
This study reduces vibration in electromechanical composite transmissions (EMT) for heavy-duty tracked vehicles. A novel gear tooth profile trimming method significantly improves vibration characteristics, validated by simulation and testing.
Area of Science:
- Mechanical Engineering
- Vehicle Dynamics
- Tribology
Background:
- Electromechanical composite transmission (EMT) is crucial for heavy-duty tracked vehicles, demanding high kinematic performance.
- High-speed and cross-country operations amplify vibration issues in EMT systems.
- Understanding excitation sources like electromagnetic torque and gear meshing is vital for vibration mitigation.
Purpose of the Study:
- To analyze vibration excitation sources in the drive motor-planet mechanism of tandem EMT systems.
- To develop and validate a tooth profile trimming method for reducing gear meshing excitation.
- To improve the overall vibration characteristics and kinematic performance of heavy-duty tracked vehicles.
Main Methods:
- Calculation of electromagnetic torque, unbalanced magnetic tension, and gear nonlinear meshing excitation.
- Establishment and analysis of a dynamic model for the drive motor-planet mechanism system.
- Proposal of a tooth profile trimming method minimizing out-of-line meshing, followed by dynamic simulation.
- Experimental validation using a vibration test rig to collect acceleration data.
Main Results:
- The influence law of excitation sources on vibration response at high rotational speeds was revealed.
- A tooth profile trimming method was proposed and its effectiveness demonstrated through dynamic simulation.
- Experimental results confirmed significant vibration improvement (up to 30%) after gear reshaping.
- Simulation and experimental results showed good agreement with an overall deviation of approximately 15%.
Conclusions:
- The proposed tooth profile trimming method effectively reduces vibration in electromechanical composite transmissions.
- The study provides a validated approach for enhancing the dynamic performance of heavy-duty tracked vehicles.
- Optimized gear profiles are essential for achieving superior kinematic performance and reducing operational noise.
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