A Design On CAE Analysis Of The 13.7 Meter Integral Body Structure About Buses With Triaxiality

It is an analysis that a dual-base on 13.7 m bus market research analysis and regulatory standards revision, combining with the of pre-research cast on requirement of producer to 13.7 m. a design means to make a preliminary reasonable research of bus body axis skeleton, which calculates the finite element and optimizes design after comparing with the material bus type abroad.Currently, Due to lacking of comprehensive study concentrating on bus the structure and performance standards on the three-axis design of passenger cars, the comparative study,checking on abroad good bus model, feasibility of the verify design and optimization of stiffness and strength parameters, is presented as following: The first chapter describes the paper basis, engineering significance and technological history of 13.7 m bus, performing an analysis about structural feature of space frame and summing up theory and process of finite element.Chapterâ…¡design starts from structure and function submitting technical standard the 13.7-meter-high three-axis load-type bus body in China to find the features of modern top bus, including the matching suspension, body structure and its usage, the body frame rectangular steel sections and overall cars from the mechanical point of view. Lastly the blueprint basing on those are drowning consisting of loading. The preliminary program and load-bearing structures of the different standard models, this chapter further examination of the two models were studied in the static strength analysis, static stiffness analysis, static deformation and free open modal analysis method for condition constraints imposed load and a finite element analysis, respectively, statistical analysis.Chapter three excavates the advantages of the engineering finite element model, the equivalent simplification of local bus, the load-bearing management and the different standard model. it provides the solutions and cast the model of different bearing-structure, Moreover, it tests the static strength, static stiffness, deformation and the free open modal analysis, it proposes a method of constraining loading.Chapter IV makes the comparison between the working conditions of the standard model and results of statistical analysis, the initial program focuses on the local poor design and design weaknesses, such as local stress before and after the bridge structure had too high, the door high local stress on the frame structure, the front door open with a large deformation of the conditions and so on. The thesis deplores the issue:the local bridge loading too much for the truss beam structure, as well as the front structure and the middle one of the local joint welding angle iron; too large transform open for a frame parts. Following those evaluations, the paper suppose a solution, to alter the bridge structure to truss structure; the door structure and the local angle iron welded joints position parallelizing the upper and lower frame beam; strengthens critical bearing parts of welding iron; written procedures optimizes bars of section of body structural size. Finally, it details the calculation of the working condition and results of statistical analysis the optimization program, concludes the static strength of pre-research programs, static stiffness and makes the performance parameters in the static deformation of the body structure to achieve good bus design requirements.Chapter IV is a summary chapter,it sum up the reasonable bus structure design, points out the limitation and future study direction,meaning to optimize scientific design and methods.