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Multi-Physics Fields Based Nonlinear Dynamic Behavior Analysis of Air Bearing Motorized Spindle.
Guoda Chen1,2,3, Yijie Chen1,2, Qi Lu1,2
1College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China.
Micromachines
|July 30, 2020
Summary
The unbalanced magnetic force (UMF) in air bearing motorized spindles (ABMS) significantly impacts nonlinear dynamics and rotor stability. This study models UMF effects, revealing it can alter rotor convergence and even enhance stability under specific conditions.
Area of Science:
- Mechanical Engineering
- Dynamics and Control
- Electromagnetism
Background:
- Air bearing motorized spindles (ABMS) are critical for ultra-precision machining, directly affecting accuracy.
- The nonlinear dynamic behavior influenced by unbalanced magnetic force (UMF) in ABMS is not fully understood.
Purpose of the Study:
- To investigate the influence of UMF on the nonlinear dynamic behavior of ABMS.
- To establish a multiphysics mathematical model for ABMS considering UMF.
Main Methods:
- Developed a mathematical model for ABMS incorporating multiphysics fields.
- Simulated UMF variation trends.
- Analyzed nonlinear dynamic behavior, focusing on rotor shaft stability.
Main Results:
- UMF variation is linear at large rotor eccentricity and nearly quadratic at small rotor eccentricity.
- UMF affects rotor center convergence position and speed.
- UMF can expand the rotor stability boundary under certain mass and load conditions.
Conclusions:
- The study provides insights into UMF influence on ABMS nonlinear dynamics.
- The multiphysics modeling approach aids in understanding ABMS behavior and improving ultra-precision machining.
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