The Static & Dynamic Analysis Of The Bus Skeleton

The framework of bus body is the main and the base parts to bear the weight.The structure's capability is directly related to its nature life and the performance of the bus.Developping bus body technique is the key to develop our country's bus industry. Applying the finite element technique to analyze the structure,put forward better opinions to satisfied the body's requests in stiffness and strength,become the main part in body designing. Along with the technical development in computer,large software such as ANSYS, NASTRAN, PARTRAN and so on are developed now, the FEM can be applied in the static&dynamic analysis,also the mode analysis of body structure.It has been proved that using FEA in bus body ananlysis is efficient, the static&dynamic analysis can be proceeded,the bearing capability and vibration characteristic can be evaluated,the stiffness,strength and inherence vibration model can be recognized.We can also know the possible stress and distortion of the bus body.The FEM has shown its advantages in the application in auto industries.Unlike the traditional design method which depends on manufacturing real vehicle, the FEM is a kind of very high-efficient and cost-effective means. It has been carried on structure strength analysis in the course of designing, manufacturing and improving.In the thesis, the author take a bus as an example,on the basis of two-dimensional project drawings, the author firstly established a geometry model of the full scale bus skeleton utilizing ANSYS. By using beam element, the finite element model for strength a analysis was setup and simplified.The FEM model also involves treatments of boundary conditions, simplified treatment of some skeleton parts and deals with the fixed weight and loading that is put on the structure.Considering four typical operation situation,such as the bus running with the uniform velocity, one of the wheels hang in the air when the bus running on an uneven road; the bus brakes suddenly and the bus steers quickly.The calculation of strength of bus body's structure are expatiated.Then the research calculates the free vibration modes of the bus skeleton.The calculating results proves that the finite element model established in the text is rational, the analysis is correct,and the results could directly help to evaluate and improve the design of the passenger car.