Damping Characteristics of a Hydraulic Electric Rectifier Shock Absorber and its Effect on Vehicle Dynamics

2015 ◽  
Author(s):  
Lin Xu ◽  
Yilun Liu ◽  
Sijing Guo ◽  
Xuexun Guo ◽  
Lei Zuo
Keyword(s):  
Vehicle Dynamics ◽  
Shock Absorber ◽  
Ride Comfort ◽  
Dynamic Performance ◽  
Nonlinear Damping ◽  
Shock Absorbers ◽  
Damping Characteristics ◽  
Electromagnetic Shock ◽  
Oil Shock ◽  
Regenerative Shock Absorber

Many energy-harvesting shock absorbers have been proposed in recent years, the most popular design is the electromagnetic harvester including linear electromagnetic shock absorbers, rotational electromagnetic shock absorbers, the mechanical motion rectifier (MMR), and the hydraulic-electromagnetic energy-regenerative shock absorber (HESA). With different energy converting mechanisms, the complicated effects of the inertia and nonlinear damping behaviors will greatly influence the vehicle dynamic performance such as the ride comfort and road handling. In this paper, we will theoretically analyze the dynamics of the suspension system with the HESA and give a guide for the HESA design. Then a simulation model of the HESA is built in AMESim to make comparison studies on the different vehicle dynamics caused by the nonlinear damping behaviors of the HESA. The advantages of HESA in terms of ride comfort and road handling will be evaluated in comparison with the similar design without accumulators and the traditional oil shock absorbers.

Performances of Energy-Harvesting Shock Absorbers on Various Types of Vehicles

2015 ◽  
Author(s):  
Sijing Guo ◽  
Lin Xu ◽  
Yilun Liu ◽  
Xuexun Guo ◽  
Lei Zuo
Keyword(s):  
Energy Harvesting ◽  
Vehicle Dynamics ◽  
Degrees Of Freedom ◽  
Large Scale ◽  
Shock Absorber ◽  
Ride Comfort ◽  
Rotational Inertia ◽  
Shock Absorbers ◽  
Regenerative Shock Absorber ◽  
Comprehensive Study

Energy-Harvesting Shock Absorber (EHSA), as a large-scale energy-harvesting mechanism for recovering suspension vibration energy, has been studied for years. A design of the regenerative shock absorber with Mechanical Motion Rectifier (MMR) has been proved to be more reliable and efficient. This paper reports a comprehensive study of the influence of MMR-based Energy-Harvesting Shock Absorber (MMR-EHSA) on vehicle dynamics performances. Models of MMR-EHSA and vehicle with MMR-EHSA with two degrees of freedom are created. Simulations are conducted on five typical vehicles, including passenger car, bus and three types of trucks. The ride characteristics of comfort, road handling and energy recovery are evaluated on these vehicles under various MMR rotational inertia and harvesting damping. The simulation results show that MMR-EHSA is able to improve both the ride comfort and road handling simultaneously under certain conditions over the traditional shock absorbers, which broadens our knowledge of MMR-EHSA’s applicable scenarios.

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.

Equivalent Circuit Modeling of Vehicle Dynamics With Regenerative Shock Absorbers

2013 ◽  
Author(s):  
Peng Li ◽  
Lei Zuo
Keyword(s):  
Equivalent Circuit ◽  
Vehicle Dynamics ◽  
Ride Comfort ◽  
Equivalent Circuit Model ◽  
Design Guidelines ◽  
Design Parameters ◽  
Inertia Effects ◽  
Shock Absorbers ◽  
Damping Behavior ◽  
Oil Shock

Regenerative shock absorbers have potential to recover a large amount of kinetic energy from vehicle vibration otherwise dissipated in traditional oil shock absorbers and at the same time to improve the ride comfort and road handling performances. Linear, rotational and mechanical motion rectifier (MMR) based electromagnetic designs have been proposed. They all have different energy conversion mechanisms, mass inertia effects, and even some nonlinear structures which make the damping behavior more complex; therefore their influence to the whole vehicle dynamics will need to be carefully assessed. This paper will present an integrated equivalent circuit model of the vehicle with electromagnetic regenerative shock absorbers, and then evaluate the vehicle dynamics performance and energy harvesting potential with different design parameters and under variable road conditions. The performance of different mechanisms of electromagnetic regenerative shock absorbers and constant shock absorber will be compared. Design guidelines for rotational electromagnetic regenerative shock absorbers will be developed based on analysis and simulation results.

scholarly journals  A Comprehensive Review of the Techniques on Regenerative Shock Absorber Systems

2018 ◽  
Author(s):  
Ran Zhang ◽  
Xu Wang ◽  
Sabu John
Keyword(s):  
Shock Absorber ◽  
Ride Comfort ◽  
Electrical Circuit ◽  
Direct Drive ◽  
Drive Mode ◽  
Shock Absorbers ◽  
Indirect Drive ◽  
Regenerative Shock Absorber ◽  
And Control ◽  
Future Work

In this paper, the current technologies of the regenerative shock absorber systems have been categorized and evaluated. Three drive modes of the regenerative shock absorber systems, namely the direct drive mode, the indirect drive mode and hybrid drive mode are reviewed for their readiness to be implemented. The damping performances of the three different modes are listed and compared. Electrical circuit and control algorithms have also been evaluated to maximize the power output and to deliver the premium ride comfort and handling performance. Different types of parameterized road excitations have been applied to vehicle suspension systems to investigate the performance of the regenerative shock absorbers including that of the nonlinear regenerative shock absorber. The research gaps for comparison of the different drive modes and the nonlinearity analysis of the regenerative shock absorbers are identified and, the corresponding research questions have been proposed for future work.

Variation in Automotive Shock Absorber Damping Characteristics & amp; Their Effects on Ride Comfort Attribute and Vehicle Yaw Response

2021 ◽  
Author(s):  
Satyaranjan Sahoo ◽  
Eric Pranesh De Reuben ◽  
Deepak BAKSHI ◽  
Hari Krishnan ◽  
Amardeep Singh
Keyword(s):  
Shock Absorber ◽  
Ride Comfort ◽  
Damping Characteristics

Electromagnetic Shock Absorbers for Automotive Suspensions: Electromechanical Design

2006 ◽  
Author(s):  
Nicola Amati ◽  
Aldo Canova ◽  
Fabio Cavalli ◽  
Stefano Carabelli ◽  
Andrea Festini ◽  
...  
Keyword(s):  
Shock Absorber ◽  
Dynamic Performance ◽  
Integrated Design ◽  
Design Procedure ◽  
Resistive Load ◽  
Added Resistance ◽  
Damping Force ◽  
Quarter Car Model ◽  
Car Model ◽  
Shock Absorbers

This article illustrates the modeling and design of electromechanical shock absorbers for automotive applications. Relative to the commonly used hydraulic shock absorbers, electromechanical ones are based on the use of linear or rotative electric motors. If electric motor is of the DC-brushless type, the shock absorber can be devised by shunting its electric terminals with a resistive load. The damping force can be modified by acting on the added resistance. An integrated design procedure of the electrical and mechanical parameters is presented in the article. The dynamic performance that can be obtained by a vehicle with electromechanical dampers is verified on a quarter car model.

Researching on Valve System of Hydraulic Electromagnetic Energy-Regenerative Shock Absorber

2012 ◽  
Vol 157-158 ◽  
pp. 911-914 ◽  
Author(s):  
Zhi Gang Fang ◽  
Xue Xun Guo ◽  
Lin Xu ◽  
Jie Zhang
Keyword(s):  
Shock Absorber ◽  
Electromagnetic Energy ◽  
Hydraulic Motor ◽  
Additional Source ◽  
Valve System ◽  
Shock Absorbers ◽  
Oil Flow ◽  
Core Components ◽  
Flow Through ◽  
Regenerative Shock Absorber

Hydraulic electromagnetic energy-regenerative shock absorber is a new kind of shock absorbers, who can perform the function of a standard shock while acting as an additional source of power. One of the core components of this new shock absorber is the valve system. And its function is to rectify the direction of the oil flow. Then the oil can flow through the hydraulic motor from one port only no matter in expansion stroke or compression stroke. The research focused on the compactness, sensitivity and energy recovery rate of two different valve systems. And the results showed that the valve system composed of check valves better matched the hydraulic electromagnetic energy-regenerative shock absorber.

scholarly journals A High-Efficiency Energy Harvesting By Using Hydraulic Electromagnetic Regenerative Shock Absorber

2020 ◽  
Author(s):  
Muhammad Yousaf Iqbal ◽  
Zhifei Wu ◽  
Khalid Mahmood
Keyword(s):  
Mathematical Model ◽  
Energy Harvesting ◽  
Shock Absorber ◽  
Mechanical Energy ◽  
Excitation Frequency ◽  
National Standard ◽  
Damping Force ◽  
Damping Characteristics ◽  
Simulation Results ◽  
Regenerative Shock Absorber

Abstract This article intends a hybrid energy harvesting shock absorber design which comprehends energy harvesting of automobile suspension vibration dissipation. A mathematical model of the energy harvesting prototype is established, and simulation results show that the dissipation energy can be recovered by varying the feed module, thereby got the damping forces ratio at different compression and extension stroke. The energy conversion from hydraulic energy to mechanical energy mainly then mechanical energy converted into electrical energy furthermore we can rechange our battery from this recovered energy. The advanced mathematical model and prototype proposed maximum ride comfort meanwhile recovered the suspension energy and fuel saving. This article shows the simulation results verifying it with prototype test results. The damping force of expansion stroke is higher than the damping force of compression stroke. The damping characteristics curves and speed characteristics curves verify the validity by simulation and prototyping damper at different amplitudes of off-road vehicles. The Hydraulic Electromagnetic Regenerative Shock Absorber (HESA) prototype characteristic is tested in which 65 watts recovered energy at 1.67 Hz excitation frequency. So, 14.65% maximum energy recovery efficiency got at 20 mm rod diameter and 8 cc/rev motor displacement. The damping characteristics of the HESA prototype examined and it has ideal performance as the standard requirements of the National Standard QC/T 491–1999.

Design and Dynamic Simulation Research of a Bionic Three-Link Tube Shock Absorber

2020 ◽  
Vol 13 ◽  
Author(s):  
Yong Song ◽  
Yue Li ◽  
Zhanlong Li ◽  
Jinyi Lian ◽  
Qinglu Shi ◽  
...  
Keyword(s):  
Dynamic Simulation ◽  
Shock Absorber ◽  
Ride Comfort ◽  
Three Dimensional ◽  
Structure Design ◽  
The Body ◽  
Three Dimensional Modeling ◽  
Shock Absorbers ◽  
Link Mechanism ◽  
Vehicle Suspension System

Background:: Shock absorbers are the main damping component of vehicle suspension system, whose excellent passive characteristics can greatly improve and guarantee the ride comfort and handling stability of vehicles. Therefore, it is of great significance to research and develop a shock absorber with excellent passive characteristics. Objective:: The purpose of this paper is to propose and design a bionic three-link tube shock absorber with good buffering and vibration reduction performance and bionic adaptive characteristics. In addition, the passive characteristics of the purposed shock absorber are studied. Methods:: The bionics idea is applied to the development of vehicle shock absorbers. A three-link mechanism with dampers and springs is abstracted and designed according to the structure and the function of kangaroo legs. A bionic three-link tube shock absorber is constructed based on the traditional tube shock absorber structures and the three-link mechanism. Three-dimensional modeling and three-dimensional dynamic simulation of the shock absorber are carried out by CATIA and ADAMS. Results:: The body acceleration are greatly reduced relative to excitations; the dynamic displacement decreases sharply under greater excitation, but there is slight increase under smaller excitation; the motion function and joint change characteristics of the proposed shock absorber are similar to those of kangaroo legs to a certain degree. Conclusion:: The results show that the structure design of the bionic three-link tube shock absorber is reasonable and workable, the shock absorber presents good buffering and damping performance and some bionic adaptive characteristics, however, there is still room for further optimization of the structure design.

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