Aiming at researching the dynamic characteristics of a rack-and-pinion hydraulic power steering system

the mathematical models of the hydraulic system are established

which included conversion valve

steering hydraulic cylinder and other components.The dynamic characteristics of the system are simulated by using SIMULINK.The deflection angle emerged by the fluctuating load is taken as the input of the system

and the force of steering hydraulic cylinder is taken as the output.The results show that

the force of steering hydraulic cylinder increased when amplitude of deflection angle increased

and the force of steering hydraulic cylinder increased when frequency of deflection angle increased.In order to improve the dynamic characteristics of the hydraulic power steering system

torsion bar stiffness

the load mass and the effective fluid volumetric modulus of elasticity are analyzed.