The Key Technology Research On Component Analysis And Topography Of Hand Brake

With finite element method, static strength simulation of a manual brake is carried out. According analysis, those three key technologies are studied, which respectively are the part s sharp point stress, the analysis of a free body, and shape optimization of manipulator used in manual brake.Firstly, the paper does research on the sharp point stress of parts in assembly and proposes three ideas for calculating it. The ideas are as follows:.circumferential stress average method,2line segment stress extrapolation method,5Chamfering radius stress extrapolation method. Based on a classic example, after finishing finite element model and simulation, the sharp point of accurate stress value is determined. Then adopt the circumferential stress average method, line segment stress extrapolation method, variable chamfering radius stress extrapolation method to calculate the stress of this point/Results show that/when near the cusp circumferential stress average method is a relatively reliable method, and in line stress extrapolation method, extrapolation from stress gradient in the direction of the largest stress is also a relatively accurate method.Secondly, the way to analyze a free body was studied. The paper raised a method to separate boundary of displacement. First of all, the assembly was meshed roughly and static strength was analyzed. Removing the other parts, the thesis replaced the constraints on the remaining parts with the boundary node displacement. In order to acquire the exact results, the remaining parts can be meshed and solved. By using a simply two-bar mechanism to assess the method, it shows that the accuracy of the result is 92% near the boundary and 100% away it.Finally, shape optimization was done to increase the strength of manipulator based on Hyper mesh and Optistruct software. According to five kinds of rib contours, the paper redesigned the manipulator model including stiffener through back to modeling software. The static strength analysis was completed in ANSYS.Comparing the stress and deformation to each other, the most appropriate design of rib was determined. Thus puts forward advices for improvement the structure of the manipulator.