Bayesian inference-based brake disc and optimization design method

Abstract

The invention discloses a brake disc based on Bayesian inference and an optimization design method.The brake disc comprises a brake disc inner disc face, the brake disc inner disc face is of a scraggly gradually-changing curved surface structure in the radial direction, and the gradually-changing curved surface structure comprises a middle arc-shaped outer convex face protruding outwards; the method comprises the following steps: taking R1, R2, R3, L1 and L2 as design variables, selecting a satisfactory average Mises stress of the brake disc surface as an observation value, and calculating the average Mises stress of the brake disc surface according to the average Mises stress of the brake disc surface, the average Mises stress of the brake disc surface, the average Mises stress of the brake disc surface, the average Mises stress of the brake disc surface and the average Mises stress of the brake disc surface, and the average Mises stress of the brake disc surface and the average Mises stress of the brake disc surface. The design variables are reversely optimized based on the Bayesian inference theory, information updating of the design variables is achieved, and finally the optimal solution of the design variables is determined; the internal heat dissipation area is increased, the heat dissipation capacity of the brake disc is improved, the brake disc structure has good heat crack resistance, the thermal fatigue life of the brake disc can be prolonged, and the brake safety of a vehicle is improved.

Description

technical field [0001] The invention relates to the technical field of automobile brake components, in particular to a brake disc based on Bayesian inference and an optimal design method. The invention can improve the thermal fatigue life of the brake disc and improve the braking safety of the vehicle. Background technique [0002] The brake disc is a key part of many heavy-duty vehicles for braking or deceleration. Frequent braking will cause high temperature on the surface of the brake disc, which will lead to thermal fatigue failure. Especially in emergency braking conditions, the temperature of the disc surface may reach six to seven At 100 degrees Celsius, thermal fatigue failure is the most common failure form of brake discs. How to improve the thermal fatigue life of brake discs is a technical problem that the heavy truck industry needs to solve urgently. Under limited conditions, the usual design means is to improve the structure of the brake disc to increase its hea...

AI Technical Summary

Problems solved by technology

[0003] The technical state of the inner disc surface of the brake disc in the prior art is usually a planar structure, such as image 3 , Image 6 As shown, the defects in the structure of the inner disc surface of the brake disc in the prior art are: the corresponding heat dissipation space is small, the heat dissipation area is limited, and the thickness L between the disc surface and the inner disc surface near the journal is uniform and unchanged, but nearly The heat generated by braking at the disc surface at the journal is not uniform, but decreases radially from the average friction radius to both sides, and the thickness L of the brake disc surface is equal to the place where the heat is relatively large and the place where the heat is relatively small , This will cause the disc surface temperature of the brake disc to decrease from the average friction radius along the radial direction to both sides. The difference in temperature will aggravate the internal thermal stress of the brake disc, so this structure also affects the thermal stress of the brake disc. The improvement is very limited. The present invention proposes a structure in which the thickness L changes continuously along the radial direction. The thickness L is larger where the heat is larger, and the thickness L is smaller where the heat is relatively small. This structure is dedicated to improving braking. The thermal stress on the disc surface makes the temperature of the brake disc surface relatively uniform and reduces the thermal stress caused by temperature differences

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