Reliability Analysis Of Magnetorheological Fluid Brake System

With the rapid development of our society today,manufacturing has become an important driving force for our economic development.Made in China 2025 puts forward higher requirements for intelligent and green manufacturing.Magnetorheological Fluid Brake is a new type of brake,whose working principle is that under the action of an external magnetic field,Magnetorheological fluid will change from a liquid state to a solid-like state,utilizing the shear force and friction between Magnetorheological fluid and the brake disc to achieve rapid braking.Compared to traditional brakes,Magnetorheological Fluid Brakes have the advantages of rapid response,high braking efficiency,intelligent control,and green energy saving,and have become one of the research hotspots of industrial brakes.Currently,many scholars at home and abroad have conducted research on Magnetorheological Fluid Brakes,but most of them focus on improving the performance and structural optimization of Magnetorheological Fluid Brakes,and the research field of reliability analysis is still in its infancy.The reason is that the structure of the Magnetorheological Fluid Brake is complex,there are many redundant parts,and the failure mechanism is complex.The traditional fault tree analysis method cannot accurately describe its failure mechanism;Secondly,the practical application of Magnetorheological Fluid Brakes is still relatively small,lacking a large amount of fault data,and unable to meet the needs of traditional probabilistic reliability analysis.Therefore,this article takes the new multi slot Magnetorheological Fluid Brake as the research object,and the main research contents include:(1)For the new multi slot Magnetorheological Fluid Brake,FMECA analysis is conducted to analyze the possible failures and brake failures of the components that make up the system,determine the risk level,and propose solutions and maintenance measures for possible failures.(2)Aiming at the problems of complex failure state and few fault data of Magnetorheological Fluid Brake,a reliability analysis method of interval dynamic fault tree analysis is proposed by introducing dynamic fault tree analysis method and interval model.(3)Combining the interval theory with the importance analysis,the interval importance based on the dynamic fault tree analysis is derived,and the weak links and key failure components of the brake are obtained through the analysis of the new multi slot Magnetorheological Fluid Brake;The results show that the importance of brake structural failure is higher than that of core components such as transmission shafts and brake discs,indicating that the design of multiple redundant components can reduce the importance of brake core components and have a significant effect on improving brake reliability.(4)An improved AGREE reliability allocation method is proposed,which comprehensively considers the failure probability and structural complexity of components,and allocates the reliability of a new multi slot Magnetorheological Fluid Brake.The reliability indicators of components are obtained.For components with structural failures,the reliability level is improved,and ultimately the reliability of Magnetorheological Fluid Brakes is improved.This provides a theoretical basis for the optimization and promotion of Magnetorheological Fluid Brakes.