A novel evaluation and optimization method of assembly interface contact characteristics

To address the current lack of comprehensive evaluation and optimization methods for contact interface characteristics in mechanical assemblies, this paper proposes a novel comprehensive evaluation and optimization method by integrating information entropy theory and harmonic mean analysis. The proposed method discretizes the assembly contact interface into a set and modifies the surface topography by adjusting the spatial coordinates of contact nodes. Iterative optimization is achieved using a novel evaluation metric and a node modification strategy based on target contact stress. As a case study, the flange interface between the first and second discs of an aeroengine is analyzed. By combining two critical characteristics uniformity of the contact stress distribution (quantified using information entropy) and the effective contact area, an optimization experiment was conducted. The results show a significant improvement, with a 89.13% increase in contact performance. Furthermore, comprehensive comparative experiments were conducted with existing evaluation and optimization methods to confirm the superior effectiveness of the proposed method. The proposed method offers a scalable solution for enhancing connection reliability and extending the service life of mechanical assemblies.