Temperature rise characteristics of the valve-controlled adjustable damping shock absorber

Abstract

The thermodynamic study of the valve-controlled adjustable damping shock absorber is conducted in order to solve the problem of oil leakage caused by excessive temperature rise of shock absorber. In this paper, the temperature rise of the valve-controlled adjustable damping shock absorber is analyzed from the perspective of energy conservation. Combined with the theory of fluid mechanics, the damping heat model is established, and the heat dissipation model of the shock absorber is established based on heat convection, heat conduction and heat radiation. The corresponding thermal equilibrium equation is established on the basis of damping heat and heat dissipation. The effects of vibration velocity, outer diameter, thickness and length of reservoir cylinder, and wind velocity on its thermal performance have been investigated. Specifically, temperature after thermal equilibrium will grow with the increase of vibration velocity and thickness of reservoir cylinder and degrade with the increase of outer diameter, length of reservoir cylinder and wind velocity. The higher the balance temperature, the shorter time is required to arrive thermal equilibrium. The difference between the experimental and simulation values of oil temperature after thermal equilibrium was not more than 2 °C, which verified the correctness of the theoretical model, while the experimental value in the process of temperature rise lagged behind the simulation value, which was mainly caused by the cumulative error of step-by-step iteration and the mechanical hysteresis in the experiment. The conclusions obtained can provide some references for the design of shock absorbers.

Research on deformation of valve slice of automobile shock absorber

“…During the operation of the shock absorber, the suction valve 4 and the intake valve 9 can be opened only with a small oil pressure, while the rebound valve 2 and the compression valve 5 can be opened when the fluid reaches a certain pressure [24][25]. The opening of the rebound valve 2 and the compression valve 5 is directly related to the vibration velocity of the piston and determines the damping force of the shock absorber [2,[26][27]. Under different vibration velocities of the piston, the structural parameters of the shock absorber valve systems have different effects on the damping force.…”

“…The shock absorber is used to absorb the vibration from the road, and its performance directly affects the ride comfort and handling stability of the vehicle [1][2][3][4][5]. The vibration absorption performance of a shock absorber is determined by its damping characteristics, which is closely related to the deformation of the valve slice in the shock absorber valve system [6][7].…”

The influence of temperature on the damping characteristic of hydraulic shock absorbers

“…In previous scientific research, shock absorber tests results could be found that take into account temperature [5,10,14,18] and their impact on the driving comfort of the user [13]. Studies of the shock absorbers filled with numerous types of fluids were also presented in [12], where the authors presented their heating characteristics during operation with a constant amplitude and frequency.…”

Influence of Changes in Stiffness and Damping of Tyre Wheels on the Outcome of the Condition Assessment of Motor Vehicle Shock Absorbers

“…Many researchers from different countries have carried out research into the characteristics of hydraulic shock absorbers. Some of them [4], for example, have studied the effect of low temperatures and others [5][6][7][8][9][10][11][12][13][14][15][16][17][18], in turn, of high temperatures on their damping characteristics. The effect of low temperatures and technical conditions on the characteristics of a hydraulic damper was studied by Z. Hryciow [19].…”