Design And Performance Simulation Of Suspension System Of Utility Terrain Fire Fighting Vehicle

Utility terrain fire fighting vehicle is an application of utility terrain vehicle in the field of fire protection.Due to its good adaptability to various terrain,it can quickly arrive at the scene of fire with complex terrain and timely control the spreading trend of fire and reduce the loss caused by fire,so it is more and more widely used in the field of fire protection.Suspension system is a key component of utility terrain fire fighting vehicle and its performance directly affects the handling performance and safety performance.Therefore,the suspension system of utility terrain fire fighting vehicle and its fatigue life are designed and studied to providing reference for simulation design and development and performance analysis of related companies.The main contents are as follows:Based on the analysis of the advantages and disadvantages of various commonly used suspensions,the type of utility terrain fire fighting vehicle suspension is determined as a double-wishbone suspension,then perform relevant design calculations on the suspension,and determine the suspension’s deflection frequency,dynamic and static deflection,suspension spring type and stiffness,shock absorber related parameters,and a three-dimensional model of the utility terrain fire fighting vehicle suspension was established,after that a modal analysis was performed on the components of the suspension guide mechanism,the results show that the part does not resonate with other parts of the utility terrain fire fighting vehicle;A dynamic model of the suspension was established using ADAMS/Car and its simulation analysis was performed,the dynamic model of the utility terrain fire fighting vehicle suspension is simulated with the wheel beating in the same direction and the wheel beating with different direction,and the variation curves of the positioning parameters of the utility terrain fire fighting vehicle suspension during the wheel beating are obtained.The toe angle design is unreasonable and needs to be further optimized;Through the ADAMS/Insight module,the experimental design and optimization of the suspension parameters were carried out.Eight key hard-point coordinates were selected for sensitivity analysis.Through comparison and analysis,the variables that had the greatest impact on the optimization target were determined,and then the variables were optimized.The optimized suspension The frame parameters are more in line with the design requirements;Through the optimized utility terrain fire fighting vehicle suspension model,the loads of the connection points of the upper and lower control arms of the suspension under three limit conditions were extracted and used as the load conditions for the finite element analysis.Later,Hypermesh was used to conduct finite element analysis on the upper and lower control arms of the suspension.The finite element analysis results of the upper and lower control arms of the suspension under three extreme conditions were obtained by the inertia release method.The stress distribution shows that it meets the design requirements of the utility terrain fire fighting vehicle suspension.The fatigue life of the established upper and lower control arm model was analyzed by using Ncode,and the minimum fatigue life of the suspension control arm under three limit conditions was obtained according to the fatigue life simulation results,which met the design requirements.