Finite Element Analysis Of The Frame Structure For Light Dedicated School Bus

The light dedicated school bus frame assembly is one of the three assembly of the school bus, is the most important school bus carrying bodies and important process components installed base. Ordinary passenger cars due to the special use of the school bus on the frame structure with great distinction and hurt, in order to reduce the incidents encountered by the students in the process of moving school bus, school bus frame position set high, reaching1meters to bear most of the impact load in the collision, therefore, dedicated school bus, the strength of the frame assembly and the unique structure of the frame run cycle and school bus safety, power, students take comfort and smooth operator controls and other properties have a decisive role.This article by a dedicated school bus frame structure of light intensity analysis, modal analysis,and stiffness analysis, shorten the development cycle of the vehicle, reducing the cost of the frame test, improve efficiency, and made light special school bus rapid market important contribution, more importantly, the primary and secondary students dedicated school bus faster and wider and the popularization of popularity in the country dedicated school bus, effectively avoid the accident the safety of students, urban public transport congestion mitigation positive contribution, while a lot of popularity in the private school bus will reduce damage due to their own quality problems on the school bus the student generation and reduce the worries of parents and school to school, from school on the way to help promote social harmony and help domestic auto companies with foreign competition in the market for school bus companies, at the same time create economic benefits for the enterprise, and also have a more far-reaching social implications and practical significance.This topic came from a car company, against the company in order to satisfy the domestic elementary school safety and design and development of dedicated school bus frame light type, the structure strength and structural vibration and structural stiffness of the finite element analysis of three aspects. In this paper, through summarizing for frame finite element analysis of research results at domestic and abroad, the frame structure of the special school bus made the following analysis:1.According to the actual design of the light bus body frame structure of the geometry model, combining with the analysis to the content, the use of3-D modeling software Pro/E and Hyper mesh and finite element analysis software ABAQUS, light dedicated school bus frame structure finite element model is established. By using the method of combination of three kinds of software, make the calculation results more accurate.2.Through the light dedicated school bus frame structure under various extreme conditions structure strength analysis, draw the frame in various extreme conditions of maximum stress below the yield strength of material, produced by the displacement amplitude is small, meet the requirements. After analysis that the frame suspension beams reinforced plate at local appear stress concentration phenomenon, suggested by better bolt hole chamfering way improved.3. In the free state of light-duty bus chassis modal analysis, get the frame in the first seven order modal vibration mode and natural frequency, through modal analysis of the evaluation principle of the results of modal analysis, this article verify the frame first order bending and torsion frequencies can avoid and engine idle speed frequency and the road excitation frequency overlap, avoided the occurrence of resonance.4. Stiffness analysis of the frame, frame bending stiffness and torsional rigidity of accord with the requirement of the bus frame stiffness.