基于三维扫描模型的制动气缸长直密封面优化设计方法OACHSSCD

The brake cylinder,as a critical component in the long-term operation of rail transit vehicles,plays a vital role in ensuring the safe and reliable performance of the vehicle.The sealing surface formed between the brake cylinder body and the cylinder cover is typically a long straight strip.Under the action of bolt preload at both ends of the sealing surface,the middle section of the cylinder cover tends to deform and warp,resulting in an uneven distribution of contact pressure on the sealing gasket,which adversely affects the sealing performance.To improve the uniformity of contact pressure on the long straight sealing surface,reverse engineering modeling of the cylinder is performed using 3D scanning technology.Based on the finite element method,the compression distribution of the gasket was obtained,and compression data along the length of the sealing surface were extracted.The least squares method was then applied to fit the compression data,resulting in an arc-fitting formula for the compression distribution.Based on the equation,the sealing surface on the cylinder body side was modified to an arc profile,higher in the middle and lower at both ends,thereby making the compression of the gasket more uniform.The Gini coefficient was used to evaluate the uniformity of contact pressure on the sealing surface,and iterative analysis was conducted to determine the optimal geometric parameters for the arc profile of the cylinder body's sealing surface.The results indicated that,prior to optimization,the stress in the middle region of the sealing gasket was relatively low,leading to poor sealing performance.However,under the same load conditions,the optimized sealing gasket exhibited significantly improved stress in the middle region,with a markedly enhanced uniformity of stress distribution and a reduced Gini coefficient.