Experimental Analysis of Laminated Fibrous Micro-Composite E-Springs for Vehicle Suspension Systems

2005 ◽  
Author(s):  
Salah A. Elmoselhy ◽  
Badr S. Azzam ◽  
Sayed M. Metwalli
Keyword(s):  
Experimental Analysis ◽  
Composite Structures ◽  
Polyester Resin ◽  
Fibrous Composite ◽  
Glass Fibers ◽  
Cost Effective ◽  
Vehicle Suspension ◽  
Micro Scale ◽  
Suspension Systems ◽  
Active Suspension Systems

Laminated fibrous micro-composite E-spring is an optimized trend of springs for vehicle suspension systems. The mechanical and frequency-response-based properties of these springs are investigated experimentally at both of the structural and constitutional levels. Thermoplastic-based and thermoset-based fibrous composite structures of the E-springs are modified at micro-scale with various additives and consequently they are compared. The experimental results reveal that additives of micrometer-sized particles of E-glass fibers as well as mineral clay to an ISO-phthalic polyester resin of the micro-composite E-spring can demonstrate superior characteristics that can surpass those of the traditional steel springs. Accordingly, micro-composite E-springs can displace both of the hydraulic dampers and steel springs in both of the passive and semi-active suspension systems in a reliable, simple, and cost-effective way.

Design and Shape Optimization of Hybrid Micro-Composite E-Springs for Vehicle Suspension Systems

2006 ◽  
Author(s):  
Salah A. Elmoselhy
Keyword(s):  
Shape Optimization ◽  
Composite Structure ◽  
Active Suspension ◽  
Vehicle Suspension ◽  
Vertical Deflection ◽  
Micro Scale ◽  
Suspension Systems ◽  
Theoretical Comparison ◽  
Induced Stress

Hybrid Micro-composite E-springs are an optimized trend of springs first introduced to vehicle suspension systems. At first, a comparison between E-shape and other spring shapes is held theoretically. This theoretical comparison is verified numerically. The E-shape has proved to be the best shape in this comparison striking a balance between spring vertical deflection and maximum induced stress. Next, shape optimization of a hybrid micro-composite E-spring is conducted. At last, a thermoplastic-based hybrid micro-composite structure of the optimized E-spring is modified at micro-scale with additives of micrometer-sized particles of mineral clay. The proposed spring is presented in new passive and semi-active suspension mechanisms, displacing and remedying drawbacks of both the hydraulic dampers and steel springs.

Road-Holding-Oriented Control and Analysis of Semi-Active Suspension Systems

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Zhengkai Li ◽  
Weichao Sun ◽  
Huijun Gao
Keyword(s):  
Active Suspension ◽  
Vehicle Suspension ◽  
The Road ◽  
Suspension Systems ◽  
Mixed Control ◽  
Active Suspension Systems ◽  
Predictive Controller ◽  
Working Principle ◽  
On The Road ◽  
Vehicle Suspension System

The most important function of a vehicle suspension system is keeping the tires on the road surface, imposing requirements on the road-holding performance. As is well known, a semi-active suspension can improve road-holding performance, but little effort has been made to build road-holding-oriented semi-active suspension controllers (RHSAC). This study improved four model reference controllers (MRCs) as RHSAC, including the road-Hook (RH), inverse ground-Hook (IGH), sky-Hook (SH), and ground-Hook (GH). These MRCs have optimal performances in different frequency ranges, and their working principle is analyzed from an energy perspective. To combine the advantages of different MRCs, a mixed control strategy is proposed to enhance the road-holding performance of the MRCs. By mixing SH and RH, the mixed SH–RH performs almost as well as a finely tuned model predictive controller, which outperforms any single MRCs. Based on CarSim-matlab cosimulations, the effectiveness of the mixed RHSAC controller is verified by various real road tests.

scholarly journals Hybrid Modelling and Sliding Mode Control of Semi-Active Suspension Systems for Both Ride Comfort and Road-Holding

Symmetry ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1286
Author(s):  
Ayman Aljarbouh ◽  
Muhammad Fayaz
Keyword(s):  
Hybrid Model ◽  
Ride Comfort ◽  
Sliding Mode ◽  
Active Suspension ◽  
Suspension System ◽  
Vehicle Suspension ◽  
Suspension Systems ◽  
Active Suspension Systems ◽  
System Components ◽  
And Control

Rigorous model-based design and control for intelligent vehicle suspension systems play an important role in providing better driving characteristics such as passenger comfort and road-holding capability. This paper investigates a new technique for modelling, simulation and control of semi-active suspension systems supporting both ride comfort and road-holding driving characteristics and implements the technique in accordance with the functional mock-up interface standard FMI 2.0. Firstly, we provide a control-oriented hybrid model of a quarter car semi-active suspension system. The resulting quarter car hybrid model is used to develop a sliding mode controller that supports both ride comfort and road-holding capability. Both the hybrid model and controller are then implemented conforming to the functional mock-up interface standard FMI 2.0. The aim of the FMI-based implementation is to serve as a portable test bench for control applications of vehicle suspension systems. It fully supports the exchange of the suspension system components as functional mock-up units (FMUs) among different modelling and simulation platforms, which allows re-usability and facilitates the interoperation and integration of the suspension system components with embedded software components. The concepts are validated with simulation results throughout the paper.

Advanced Control Techniques for Semi-Active Suspension Systems

2020 ◽  
Author(s):  
Jessica Gissella Maradey Lazaro ◽  
Kevin Sebastián Cáceres Mojica ◽  
Silvia Juliana Navarro Quintero
Keyword(s):  
Control Technique ◽  
External Control ◽  
Vehicle Suspension ◽  
Driving Experience ◽  
Control Techniques ◽  
Suspension Systems ◽  
Active Suspension Systems ◽  
Advanced Control ◽  
The Subject ◽  
Correct Application

Abstract Semiactive suspension system provides comfort and precise support for any type of driving in vehicles. Their main feature consists in the modification of the damping coefficient by applying an external control. Commonly, these suspensions work with non-linear dampers, such as magnetorheological, electrorheological, pneumatic, dry friction, among others; which generate a discontinuous behavior of force, causing an annoying noise known as “chattering”; however, this can be deleted by the correct application of the control technique. So, control strategy selection is a key task in the modeling of dynamic behavior and to describe the variation of characteristics, as well as to achieve the best vehicle’s driving experience in terms of comfort, performance, reliability, stability, and safety. This article shows three advanced control techniques used to design a semi-active vehicle suspension taking the quarter car as the model. From the review of the state of the art, relevant works and authors on the subject are reported. After, the application of the control techniques is shown together with the results obtained, specially, the performance of the system is carried out by means of computer simulations in the Matlab/Simulink virtual environment, accompanied by near-reality disturbances to verify the effectiveness of this study.

scholarly journals A review of the vehicle suspension system

2020 ◽  
Vol 4 (2) ◽  
pp. 109-114
Author(s):  
Iyasu T. Jiregna ◽  
Goftila Sirata
Keyword(s):  
Active Suspension ◽  
Suspension System ◽  
The Body ◽  
Vehicle Body ◽  
Vehicle Suspension ◽  
The Road ◽  
Suspension Systems ◽  
Active Suspension Systems ◽  
Different Types ◽  
Proper Design

The driving comfort of the vehicle is primarily determined by the design of the suspension system, which transmits the force between the vehicle and the ground. There are different types of vehicle suspension systems, including active suspension systems that provide significant benefits for ride comfort while driving. However, the existing active suspension systems have limited functions such as power, and also complex structure. To overcome the problem, the proper design of the active suspension system by considering its present limitations is essential. A well-designed active suspension system controls the load on the wheels under the resonance of the body structure and ensures driving comfort. It reduces the vibrational energy of the vehicle body caused by the excitation of the road while keeping the stability of the vehicle within an acceptable limit. For a proper design of the active suspension system, the road surface, the seat suspension, and the wheel load are the most important elements to consider. In this study, different types of vehicle suspension systems with their limitations have been thoroughly investigated. Many aspects of control and some of the essential practical considerations are also explored.

A novel approach to design and control of an active suspension using linear pump control–based hydraulic system

2019 ◽  
Vol 234 (5) ◽  
pp. 1224-1248
Author(s):  
Jeongwoo Lee ◽  
Kwangseok Oh ◽  
Kyongsu Yi
Keyword(s):  
Vehicle Dynamics ◽  
Hydraulic System ◽  
Cost Effective ◽  
Active Suspension ◽  
Linear Motor ◽  
Suspension System ◽  
Suspension Systems ◽  
Active Suspension Systems ◽  
Actuator System ◽  
And Control

This paper presents a novel design and control method of an active suspension system using a linear pump control–based hydraulic system for a cost-effective application. Various active suspension systems have been proposed and applied to vehicles due to its ability to improve ride comfort and handling performance even though these active suspension systems are not popular because of their complexity, high cost, heavyweight, and low power efficiency. A new type of active suspension actuator system was designed and validated herein based on the methods of actuator sizing and modified control scheme to address the aforementioned issues. System power capability has been analyzed under various dynamics and road conditions. Active suspension actuator components have been designed based on the results. The electro-hydraulic system is powered by a battery to reduce the energy consumption of the system; hence, it is operated by torque on demand. A double-acting linear hydraulic motor pump with a dual rack and pinion has been proposed for hydraulic force control with a simple on/off switch operation. The actuator force has been controlled by continuous linear motor pump displacement control via torque control using a three-phase synchronous brushless alternative current motor. Dynamic performance evaluation of the actuator system has been conducted using AMESIM and actual rig test. Active height and roll control algorithms for the enhancement of vehicle dynamics considering actuator dynamics have also been developed and validated through the rig and real vehicle tests. The evaluation results showed that the linear motor pump–based active suspension system performs as well as the previous complicated hydraulic active suspension system. The new active system proposed in this study was able to improve the vehicle dynamics using cost-effective actuation system significantly.

scholarly journals Operational Modal Analysis and the Performance Assessment of Vehicle Suspension Systems

2012 ◽  
Vol 19 (5) ◽  
pp. 1099-1113 ◽  
Author(s):  
L. Soria ◽  
B. Peeters ◽  
J. Anthonis ◽  
H. Van der Auweraer
Keyword(s):  
Modal Analysis ◽  
Cost Effective ◽  
Operating Conditions ◽  
Operational Modal Analysis ◽  
Vehicle Suspension ◽  
Active System ◽  
Passenger Cars ◽  
Suspension Systems ◽  
Controlled Systems ◽  
Output Only

Comfort, road holding and safety of passenger cars are mainly influenced by an appropriate design of suspension systems. Improvements of the dynamic behaviour can be achieved by implementing semi-active or active suspension systems. In these cases, the correct design of a well-performing suspension control strategy is of fundamental importance to obtain satisfying results. Operational Modal Analysis allows the experimental structural identification in those that are the real operating conditions: Moving from output-only data, leading to modal models linearised around the more interesting working points and, in the case of controlled systems, providing the needed information for the optimal design and verification of the controller performance. All these characters are needed for the experimental assessment of vehicle suspension systems. In the paper two suspension architectures are considered equipping the same car type. The former is a semi-active commercial system, the latter a novel prototypic active system. For the assessment of suspension performance, two different kinds of tests have been considered, proving ground tests on different road profiles and laboratory four poster rig tests. By OMA-processing the signals acquired in the different testing conditions and by comparing the results, it is shown how this tool can be effectively utilised to verify the operation and the performance of those systems, by only carrying out a simple, cost-effective road test.

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