| This paper designed the carriage and automatic closures of a new-type truck based on the original design according to the actual production needs of domestic box-type truck; the stiffness and strength of carriage direct relating to performance and service life of the truck for it is the Important part of the truck, based on Solid Works to established a simulation model of the overall structure of the carriage containing the closures, make the meshing and applying loads and constraints for the carriage model which preliminary designed, use the finite element analysis software of ANSYS Workbench to static simulation analysis for four typical conditions of bending,twisting, emergency braking and turning; Combined with the static analysis results of typical conditions, make the strengthening design for the structure of parts which exceed the yield limit of the material, to improve the overall performance of the truck;in addition to, make the improve design of lightweight for the parts which are smaller force to reached the goals of rational use of material; make the computational analysis and check again to the four typical conditions for the model of new carriage after improvement which containing the closures, by comparing the results found that: the stiffness and strength have been greatly improved of the new carriage, and the weight reduced 6% compared with the preliminary design in the conditions of the stiffness and strength meet the requirements. In order to avoid the resonance of the carriage in the moving process, so study the vibration characteristics to the model of new carriage,extracted the first ten non-steel modal of the new carriage to calculate the range of excitation frequency under the idle speed of the engine, the results shown that the range of non-steel natural frequency values between 6.18-26.74 Hz, stagger the idle speed vibration frequency of engine between 32.5-145 Hz, and stagger the common excitation frequency 3Hz caused road roughness, so there are no resonance when the truck normal driving, eventually, the lightweight improved of the new carriage which containing the closures meet the design requirements and national standards in theory,and nowadays the program has been adopted by enterprises. The analysis process and methods can provide reference to finite element analysis of carriage of truck and related products. |
