Characteristics Simulation And Analysis Of Double-wishbone Suspension With Bionic Kangaroo Leg Structure

With the rapid development of the automotive industry and the widespread use of automobiles,people are increasingly demanding the performance and quality of automobiles(Such as handling stability and ride comfort at high speeds),among which the requirements for suspension performance are particularly prominent.Thanks to the natural evolution of the kangaroo's leg structure,the jump has many advantages such as high speed,low energy consumption,good ground adaptability,stable motion and low vibration.Therefore,inspired by this,it is attempted to abstract the naturally evolved kangaroo leg structure into an engineering buffer damping structure and apply it to an automotive suspension.Then,by constructing an automobile suspension with a kangaroo leg cushion structure,the structural parameters of the suspension are studied to improve its performance and quality.In this paper,a double wishbone suspension is used as the object of application to construct a double wishbone suspension with a kangaroo leg cushion structure,and its parameter characteristics are studied.This paper presents a three-bar kangaroo leg cushion structure by studying the structure of kangaroo leg.The stiffness characteristics of the structure are analyzed using the virtual displacement principle,and the corresponding stiffness characteristic formula are listed.Using ADAMS/View software,a virtual prototyping model of kangaroo leg structure was established,and the motion characteristics of each component in the falling process of the upper hop were obtained.Using the dynamics analysis software ADAMS/Car module,the double wishbone suspension and double wishbone suspension model with imitation kangaroo leg structure were established respectively,and two kinds of suspension models were simulated by two-wheel parallel run out.The comparative analysis found that the camber angle of the double wishbone suspension with kangaroo leg structure was reduced by 0.5°,about 21%,and that of kingpin was reduced by 0.4°,about 13%;The toe angle change rangeincreased by 0.6°,an increase of approximately 14%.The rigidity characteristics of the double wishbone suspension with kangaroo leg structure were studied.It was found that the stiffness value was divided into two stages of compression and tension with the change of the suspension stroke,and the linear stiffness of suspension stiffness was exhibited during the tension stage.The law of nonlinear rapid increase of suspension stiffness in incremental and compression stages.The stage demarcation point is close to the static equilibrium position of the suspension.This result verifies the correctness of the stiffness equation derived from the virtual displacement principle.In addition,the analysis found that the parameters affecting the structural rigidity of the kangaroo leg include the angle between the spring and the kangaroo leg member,the length of the kangaroo leg member and the position of the spring on the kangaroo leg member.The research results of this paper can provide theoretical basis and reference for the development of new type of bionic suspension.