Strength And Stiffness Analysis And Optimal Design Of Cab Structure For Articulated Tracked Vehicle

Articulated steering tracked vehicle is a kind of vehicle with good all-terrain trafficability and mobility.It is often used as a special engineering vehicle to carry out transportation operations under harsh and dangerous conditions.Therefore it is of significance on the cab,as the working place of drivers,whose structural performance is directly related to the safety of drivers.According to the general layout of the articulated tracked vehicle cab and the theory of finite element,it is accessible to simplify the structure of the cab,to select the finite element type and material,and to establish the finite element model of the articulated tracked vehicle cab in HyperMesh,preparing for the analysis of the dynamic and static characteristics of the cab under different working conditions.The model is imported into the finite element software,and the cab strength and stiffness characteristics of the tracked vehicle cab are obtained by analyzing the cab through the combination of HyperMesh and ANSYS.According to the actual situation,the typical working conditions such as static load,acceleration,steering,climbing solpe and braking are simulated,in which the structural performance of the cab is analyzed.Considering the simplification of the model in modeling,the false stress phenomena in the analysis results should be distinguished to ensure the actual stress distribution and deformation displacement of the cab.Through strength and stiffness analysis,it can be determined that the cab structure meets the engineering performance requirements of articulated tracked vehicles,and achieves its lightweight target.Owing to the high speed of articulated steering tracked vehicle,it’s necessary to consider the dynamic characteristics of cab structure in actual operation,by using modal analysis method on cab.Through analysis,the natural frequencies and modal modes of the cab can be accessible.Using the analysis results as guide,the cab is designed to ensure the reasonable modal frequency distribution and avoid resonance under the excitation of internal and external loads.Through the strength and stiffness analysis and modal analysis of the cab structure,the lightweight and weak parts of the cab structure are available.Light weight cab design is carried out under the guidance of size optimization and shape optimization.The optimization model is arranged with plate and shell thickness of the bottom and lateral structure of the cab as design variables,together with design variables selection,definition of state variables and objective functions,and then the optimization model of the cab is obtained by ANSYS software.The optimized cab structure is re-calculated by finite element analysis,and its strength,stiffness and modal characteristics are satisfying.Compared with the non-optimized model,the optimized cab structure capacity and vibration characteristics meet the engineering performance requirements of articulated tracked vehicle,and the final cab lightweight loss is 110.9 kg,which shows that the lightweight scheme is feasible.