Lubrication Condition Assessment of Planetary Roller Screw under Varying Operating Parameters
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Abstract
The planetary roller screw mechanism (PRSM) is a critical transmission component in electromechanical actuators. Under prolonged operation in harsh service conditions, PRSMs are prone to lubrication deficiencies, which significantly increase the risk of mechanical failure. Consequently, it is essential to develop evaluation techniques for the lubrication condition of PRSMs to enable efficient health management. This study proposes an assessment method for PRSM lubrication status during operation based on a vibration mechanism model. The model integrates the contact characteristics of the threads and operating parameters to characterize the influence of internal lubrication conditions on the system's vibration response. Based on this model, a dimensionless evaluation metric was developed that depends on the amount of lubricant used. Using a dedicated experimental test rig, vibration signals were collected under varying screw rotational speeds, axial loads, and lubricant quantities to validate the method. The experimental results demonstrate the effectiveness of the proposed method in evaluating the lubrication state under varying operating conditions using a small amount of vibration data.
How to Cite
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Planetary roller screw mechanism, Lubrication condition, Vibration analysis
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