| As the important constituent of vehicle system， Suspension is always animportant factor in the development of vehicle. Balanced suspension is the mainsuspension structure in the modern heavy multi axle vehicle. The reason of its wideapplication is that balance suspension has its own advantages. Balance suspension canimprove the transportation efficiency as far as possible in the allowable range andensure the vehicle running with good control stability and safety. With the rapiddevelopment of automobile industry, people put forward higher requirements to theheavy vehicle performance in all aspects. Therefore, as the key system which impacton vehicle performance, research of balance suspension system has aroused wideconcern.Leaf spring is the main elastic component of balanced suspension system. Itsreasonable structure and performance plays a vital role in balanced suspension andvehicle performance. Rationality of leaf spring design has the vital significance toimprove vehicle ride comfort, comfort and safety. Combing with four bridge mixerchassis development project for a Heavy Machinery Limited Company, this paperstudied on the leaf spring and balanced suspension.This paper expounded the basic knowledge of balance suspension andclassification and structure of leaf spring and studied on the traditional calculationmethod of leaf spring. Several computational models of leaf spring were analyzed andcompared systemically. The basic hypothesis, calculation method and formula ofconcentrated load method and common curvature method were introduced. Based onconcentrated load method, calculation formula of leaf spring stiffness and stress wasdeduced. Theoretical calculation model of leaf spring was established and programverification. In addition, finite element calculation models of leaf spring in theanterior-posterior suspension were established. Combined with the contact nonlinearfinite element method, the study analysed and calculated stress distribution andstiffness characteristics of leaf spring.The research studied on the characteristics of balance suspension structure.Considering complex stress and friction characteristics of multi leaf spring, the finiteelement model of balance suspension was established in the nonlinear finite elementsoftware ABAQUS. By setting the reasonable loading condition, K&C characteristic calculation model of balance suspension was established base on the principle of test.Based on the finite element method, stiffness and K&C characteristic of suspensionwere simulated numerically and extracted data of simulation analysis. Based on thesimulation of suspension and the transmission optimization, kinematics analysis ofthe balanced suspension was conducted. The transmission optimization model wasestablished. By means of combining genetic algorithm with suspension motion model,transmission shaft optimization design was completed. Based on the theory ofmulti-body dynamics, data processing model with finite element method of the K&Ccharacteristics was deduced and established. Using the established model andextracted data of the simulation, study programmed the data processing to get andanalyze the K&C characteristic curve of balance suspension. Based on the suspensionmodel and Trucksim software, vehicle simulation model and virtual test wereestablished. According with the national standard, research made simulation ofvehicle handling and stability and evaluated the results by keeping score. AnalysisResults can provide theoretical reference and direction for subsequent development ofsuspension and vehicle. Finally, in order to improve the reliability and feasibility ofthe test of prototype, the article researched method of censorial position measurementand designed anti-rollover bracket. |
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