Interval analysis for normal contact stiffness of mechanical joint surface based on the Legendre-scanning method

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (8) : 70-77.

LIU Yong1，QU Jie1，ZHANG Qing1，WANG Dawei1，YAN Fangchao2

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Abstract

An interval model was established to analyze the normal contact stiffness of a mechanical joint. The model takes into consideration the uncertain parameters such as asperity radius of curvature, distribution density, and asperity height variance. To address the limitations of traditional contact stiffness models in determining the reasonable range of normal contact stiffness, the KE elastic-plastic contact stiffness model and Legendre polynomials were utilized. The model was validated by comparing it with contact stiffness test data and traditional model solution results. The feasibility and accuracy of Legendre-scanning method were proved by the results. The results show that the rough surface topography parameters have a significant impact on normal contact stiffness, with the uncertainty of asperity height variance having the greatest influence. As the dimensionless contact distance decreases, the degree of influence increases. The establishment and analysis of the interval model for normal contact stiffness in mechanical joints can serve as a reference for further research on joints.

Key words

Aeroengine / Uncertainty / Normal Contact Stiffness / Legendre Polynomial / Scanning Method

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LIU Yong1，QU Jie1，ZHANG Qing1，WANG Dawei1，YAN Fangchao2. Interval analysis for normal contact stiffness of mechanical joint surface based on the Legendre-scanning method[J]. Journal of Vibration and Shock, 2024, 43(8): 70-77

References

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