scholarly journals Analysis of Damping Characteristics of a Hydraulic Shock Absorber

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Zhifei Wu ◽  
Guangzhao Xu ◽  
Hongwei Yang ◽  
Mingjie Li
Keyword(s):  
Shock Absorber ◽  
Check Valve ◽  
Line Length ◽  
Hydraulic Shock ◽  
Hydraulic Motor ◽  
Damping Force ◽  
Unidirectional Flow ◽  
Damping Characteristics ◽  
Hydraulic Shock Absorber ◽  
Inner Diameter

In the present study, a hydraulic shock absorber is proposed. Since the damper is mainly used in suspension energy recovery system, the damping characteristics of the damper under no-load state are studied in this paper. Structural design is conducted so that the unidirectional flow of the oil drives the hydraulic motor to generate electricity. Meanwhile, an asymmetrical extension/compression damping force is obtained. A mathematical model of the shock absorber is established, and the main characteristics of the inherent damping force are obtained. Based on the established model, effects of the accumulator volume, accumulator preinflation pressure, hydraulic motor displacement, check valve inner diameter, and spring stiffness, hydraulic line length and inner diameter on the indicator characteristics are analyzed. Moreover, a series of experiments are conducted on the designed damper to evaluate the characteristics of the inherent damping force and analyze the effect of the accumulator volume and preinflation pressure on the damping characteristics.

scholarly journals Modeling and Analysis of a Hydraulic Energy-Harvesting Shock Absorber

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Zhifei Wu ◽  
Guangzhao Xu
Keyword(s):  
Energy Harvesting ◽  
External Load ◽  
Energy Recovery ◽  
Shock Absorber ◽  
Load Resistance ◽  
Hydraulic Motor ◽  
Damping Force ◽  
Modeling And Analysis ◽  
Unidirectional Flow ◽  
Energy Dissipated

This paper proposes a hydraulic energy-harvesting shock absorber prototype, which realizes energy harvesting of the vibration energy dissipated by the automobile suspension system. The structural design of the proposed shock absorber ensures that the unidirectional flow of oil drives the hydraulic motor to generate electricity while obtaining an asymmetrical extension/compression damping force. A mathematical model of the energy-harvesting shock absorber is established, and the simulation results indicate that the damping force can be controlled by varying the load resistance of the feed module, thus adjusting the required damping force ratio of the compression and recovery strokes. By adjusting the external load, the target indicator performance of the shock absorber is achieved while obtaining the required energy recovery power. A series of experiments are conducted on the prototype to verify the validity of the damping characteristics and the energy recovery efficiency as well as to analyze the effect of external load and excitation speed on these characteristics.

Modeling, Experiments, and Parameter Sensitivity Analysis of Hydraulic Electromagnetic Shock Absorber

2016 ◽  
Author(s):  
Sijing Guo ◽  
Lin Xu ◽  
Yilun Liu ◽  
Mingyi Liu ◽  
Xuexun Guo ◽  
...  
Keyword(s):  
Shock Absorber ◽  
High Reliability ◽  
Average Power ◽  
Hydraulic Motor ◽  
Damping Force ◽  
Shock Absorbers ◽  
Damping Characteristics ◽  
Thermal Fatigue Life ◽  
Electromagnetic Shock ◽  
Electromagnetic Shock Absorber

To improve the vehicle fuel economy and prolong the thermal fatigue life of the traditional shock absorbers, energy regenerative electromagnetic shock absorbers have attracted wide attentions. This paper discusses a hydraulic electromagnetic shock absorber (HESA), which has high reliability. A dynamic model of HESA is created in this paper, which shows that the damping force of HESA is composed of the electric damping force, friction damping force, the inerter force and the accumulator force. Influences of hydraulic motor and pipe diameter on the force are analyzed based on the modeling. The parameters of the nonlinear component accumulator are also studied experimentally. Both modeling and lab tests show that the accumulator force can counteract part of the effect of the inerter force, which is greatly beneficial for the vehicles. The damping characteristics and energy harvesting characteristics are also studied based on the lab tests. Results show that the damping coefficient of HESA ranges from 12000Ns/m to 92000Ns/m at a vibration input of 3Hz frequency and 5mm amplitude, and HESA has a unique damping characteristic which needs to be further studied for vehicle dynamics. In addition, the efficiency of HESA can achieve 30% at a vibration input of 3Hz frequency and 7mm amplitude with external resistance of 4 ohms. The average power at this excitation can reach 102 watts.

scholarly journals Parameters Analysis of Hydraulic-Electrical Energy Regenerative Absorber on Suspension Performance

2014 ◽  
Vol 6 ◽  
pp. 836502 ◽  
Author(s):  
Han Zhang ◽  
Xuexun Guo ◽  
Lin Xu ◽  
Sanbao Hu ◽  
Zhigang Fang
Keyword(s):  
Degrees Of Freedom ◽  
Influencing Factor ◽  
Check Valve ◽  
Electrical Energy ◽  
Hydraulic Motor ◽  
Orifice Area ◽  
Damping Characteristics ◽  
Sinusoidal Input ◽  
Force Velocity ◽  
Inner Diameter

To recycle the vibration energy of vehicles over rough roads, a hydraulic-electricity energy regenerative suspension (HEERS) was designed in the present work, and simulations were performed with focus on its performance. On the basis of the system principle, the mathematical model of hydraulic-electrical energy regenerative absorber (HEERA) and two degrees of freedom (DOF) suspension dynamic model were constructed. Using the model of HEERA, simulations on force-displacement and force-velocity characteristics were performed with a 1.67 Hz frequency and a sinusoidal input adopted. And then in combination with HEERA model and two DOF suspension models, simulations on the performance of HEERS also were carried out. Finally, the influences of charging pressure and volume of the accumulator, hydraulic motor displacement, orifice area of check valve, and inner diameter of hydraulic pipelines on the performance of HEERA and HEERS were investigated in depth. The simulation results indicated that (i) the damping characteristic of HEERA was coincident with the damping characteristics of traditional absorber; (ii) the most remarkable influencing factor on the performance of HEERS was the hydraulic motor displacement, followed by orifice area of check valve, inner diameter of pipelines, and charging pressure of accumulator, while the effects of charging volume of accumulator were quite limited.

scholarly journals Modelling, Testing and Analysis of a Regenerative Hydraulic Shock Absorber System

Energies ◽  
2016 ◽  
Vol 9 (5) ◽  
pp. 386 ◽  
Author(s):  
Ruichen Wang ◽  
Fengshou Gu ◽  
Robert Cattley ◽  
Andrew Ball
Keyword(s):  
Shock Absorber ◽  
Hydraulic Shock ◽  
Hydraulic Shock Absorber

The Effects of Fluid and Mechanical Compliance on the Performance of Hydraulic Shock Absorbers

1974 ◽  
Vol 96 (1) ◽  
pp. 101-106 ◽  
Author(s):  
R. W. Mayne
Keyword(s):  
Differential Equations ◽  
Shock Absorber ◽  
Rigid Wall ◽  
Hydraulic Shock ◽  
Orifice Area ◽  
Shock Absorbers ◽  
Constant Area ◽  
Mechanical Compliance ◽  
Hydraulic Shock Absorber ◽  
The Ideal

Dimensionless differential equations are developed which model a hydraulic shock absorber. These equations are solved numerically to determine quantitatively the effects of fluid compressibility and series and parallel springs on the shock absorber operation. Both variable and constant orifice area are considered for a system protecting a mass during impact against a rigid wall. The results show that a finely tuned variable area shock absorber is degraded by the considered forms of compliance. Performance of the constant area shock absorber can be improved by including compliance and, with an appropriate parallel spring, the ideal flat deceleration profile can be obtained without variable orifice area.

Sign in / Sign up

Export Citation Format

Share Document