| The frame is the core of the semi-trailer parts assembly, its structural strength and stiffness of the semi-trailer loads, vibration, fatigue life has a decisive influence. At present, the domestic semi-trailer fatigue analysis by the finite element method and dynamic knowledge for analysis on a single frame or components, but in the actual process of moving semi-trailer container itself has some stiffness, it have a significant impact on the overall force of the frame, so this article in considering the stiffness of container and frame and container in contact case, telescopic semitrailer frame analyzed and comparison with the conditions of the frame of the carriage of bulk cargo analysis, the results showed that considering container stiffness the semitrailer frame of the simulation is more in line with the type of the actual use of the semi-trailer.This paper studies the impact of the container on telescopic frame fatigue life, telescopic Semitrailer fatigue analysis in different conditions conditions and semi-trailer frame size optimization in the case of the fatigue strength is not affected. The main contents are as follows:1) Were established in accordance with the characteristics of the telescopic trailer frame and the corresponding finite element model of the container, and to simulate the connection between the parts of each frame and between the frame and the container through the the ID unit and surface contact.Through the modal analysis of the vibration characteristics of the frame, and then according to the different conditions of frame strength analysis, analysis results show that analysis of the strength of the frame when considering container is more in line with the actual use of such models.2) To establish multi-body dynamics model of rigid-flexible coupling of the semi-trailer in ADAMS/Car, which takes into account the flexible body frame has an affect on the vehicle of load distribution. Through simulation get peak load of the frame seven installed point. Frame seven installed point stress distribution calculated by the inertia release.3) According to the vehicle simulation pavement load spectrum, and combined with the frame of stress distribution under unit loads and the frame material properties, fatigue life analysis of the two carriage conditions telescopic frame to give life nephogram. By comparison with the actual destruction verify the feasibility of the simulation model.4) In bending and torsion condition frame material allowable stress as a constraint, the telescopic frame member thickness as a design variable to calculate the frame. Frame structure optimized fatigue strength validation results showed that8.6%lighter than the original model eventually optimize the quality of the frame.In two different conditions of carrying telescopic frame fatigue strength analysis and optimization of its size, the results show that:the container stiffness will have a great impact on the overall force of frame, and affecting the overall the fatigue strength of the frame. Carrying the same cargo container, the rear axle forward transfer part of the load so the stretched frame life than shortened frame. The optimized frame weight is8.6%less than the original, in the case of the fatigue strength is not affected. At the same time, the analysis method used in this paper provide a new analysis process for future vehicles with cargo box simulation, and stretch the front and rear frame analysis of the data also provide some reference value for the frame modified. |
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