Performance Predictions for a Pneumatic Active Car Suspension System

1988 ◽  
Vol 202 (4) ◽  
pp. 243-250 ◽  
Author(s):  
R S Sharp ◽  
J H Hassan
Keyword(s):  
Active Control ◽  
Suspension System ◽  
Low Frequencies ◽  
Control Laws ◽  
Suspension Parameters ◽  
Car Suspension ◽  
Road Roughness ◽  
Performance Predictions ◽  
Set Up ◽  
Space Requirements

A mathematical model of a pneumatic active car suspension system in a single wheel station form excited by realistic road roughness input is set up. The active control is exerted through a d.c. motor-driven air-pump. The model is used to show that essentially all the advantages of active control, within the terms of reference, are obtained by employing the control only at low frequencies and having the suspension parameters adapt to the running conditions as they vary. Control laws are derived using limited state feedback, linear stochastic optimal control theory and power consumption, and space requirements are evaluated. System performance is shown to be good in comparison with other known arrangements and encouragement for further work to extend the results is given.

Energy Harvesting and Damping Capability of Quarter-Car Test Bed

2016 ◽  
Author(s):  
Abdullah A. Algethami ◽  
Won-jong Kim
Keyword(s):  
Energy Harvesting ◽  
Active Control ◽  
Suspension System ◽  
Test Bed ◽  
Efficient System ◽  
Car Suspension ◽  
Significant Interest ◽  
Quarter Car ◽  
Mass Spring ◽  
Damping Capability

Recovering and regenerating power in automotive applications has drawn significant interest recently. A car-suspension system can be modeled as a 2-DOF mass-spring-damper system. Active control used for the car suspension system produces results superior to other methods. In this study, a 3-phase linear generator is used to harvest energy and suppress vibration on a quarter-car suspension setup. The suspension system is analyzed to estimate the harvestable power and damping capability of the generator. Analysis for the generator and its efficiency are presented. Harvestable power of around 105 mW was achieved at a 3.5-Hz input disturbance. The regenerative suspension system can reduce the vibration of the sprung-mass acceleration by up to 22% in an indexed performance. Around 8.4 W used to drive the motor in active control was saved when the regenerative system was used. As a result, much energy can be saved by switching from the active to the energy-harvesting mode. A more efficient system can be designed by matching the mechanical and electromagnetic (EM) damping.

Fuzzy Controller for Semi-Active Automobile Suspension System under Random Profiled Road Input

2014 ◽  
Vol 668-669 ◽  
pp. 474-477
Author(s):  
Qi Hua Ma ◽  
Jing Luo ◽  
Chun Yan Zhang
Keyword(s):  
Ride Comfort ◽  
Fuzzy Controller ◽  
Dynamic Performance ◽  
Active Suspension ◽  
Suspension System ◽  
Vehicle Body ◽  
Control Laws ◽  
Passive Suspension ◽  
External Conditions ◽  
Set Up

The suspension system is one of the most important parts of the automobile. The suspension system has an important influence on the ride comfort and maneuverable stability of the automobile. As structure parameters of traditional passive suspension cannot adaptively change with external conditions, the improvement of dynamic performance is difficult. Tow-DOF and four-DOF suspension of vehicle model is set up in this paper. Under random profiled road input simulated by using Runge-Kutta method, the control laws of fuzzy controller are adjusted by using different weight coefficients and use Matlab software to simulate the performances. Then, the results are compared and the performances are analyzed between passive suspension and semi-active suspension. The simulation results show the semi-active suspension is more effective for decreasing the vibration of vehicle body than the passive suspension, and designed fuzzy controller is effective for controlling the active controller of the semi-active suspension.

The Relative Performance Capabilities of Passive, Active and Semi-Active Car Suspension Systems

1986 ◽  
Vol 200 (3) ◽  
pp. 219-228 ◽  
Author(s):  
R S Sharp ◽  
S A Hassan
Keyword(s):  
Vehicle Speed ◽  
Active System ◽  
Control Laws ◽  
Active Systems ◽  
Suspension Systems ◽  
Working Space ◽  
Car Suspension ◽  
Road Surface Roughness ◽  
Good Set ◽  
Space Requirements

Based on the well-known quarter car representation of the automobile suspension design problem, pdomnce parameters relating to passenger discomfort, working space and tyre load variability are generated for passive, active and semi-active suspension systems. Active systems of two types having different hardware implications are considered, and linear optimal control theory is used in each case to derive a good set o control law parameters. The semi-active systems studied have control laws based on the fully active systems, but are capable only of dissipating energy, so that where the corresponding active system would be acting as an energy supply, the semi-active system switches off Practically realizable switching dynamics are assumed in the calculations. Results for all the systems, for one road surface roughness and vehicle speed, are generated in a form which allows comparison between systems of diffient types which have equal suspension working space requirements. The wider implications of the results are discussed, and far-reaching conclusions about the relative capabilities and design features of passive, active and semi-active systems are drawn.

scholarly journals Design of a suspension system and determining suspension parameters of a medium downforce small Formula type car

2017 ◽  
Vol 124 ◽  
pp. 07006
Author(s):  
Sadjyot Biswal ◽  
Aravind Prasanth ◽  
R. Udayakumar ◽  
Shobhit Deva ◽  
Aman Gupta
Keyword(s):  
Suspension System ◽  
Suspension Parameters ◽  
Formula Type

Scheduling Strategy of Multiple Semi-Active Controllers With Information on the Disturbance and the Structural Response

2016 ◽  
Author(s):  
Kazuhiko Hiramoto ◽  
Taichi Matsuoka ◽  
Katsuaki Sunakoda
Keyword(s):  
Optimal Control ◽  
Control System ◽  
Active Control ◽  
Structural Response ◽  
Design Parameters ◽  
Control Law ◽  
Control Performance ◽  
Multiple Control ◽  
Control Laws ◽  
Scheduling Strategy

A scheduling strategy of multiple semi-active control laws for various earthquake disturbances is proposed to maximize the control performance. Generally, the semi-active controller for a given structural system is designed as a single control law and the single control law is used for all the forthcoming earthquake disturbances. It means that the general semi-active control should be designed to achieve a certain degree of the control performance for all the assumed disturbances with various time and/or frequency characteristics. Such requirement on the performance robustness becomes a constraint to obtain the optimal control performance. We propose a scheduling strategy of multiple semi-active control laws. Each semi-active control law is designed to achieve the optimal performance for a single earthquake disturbance. Such optimal control laws are scheduled with the available data in the control system. As the scheduling mechanism of the multiple control laws, a command signal generator (CSG) is defined in the control system. An artificial neural network (ANN) is adopted as the CSG. The ANN-based CSG works as an interpolator of the multiple control laws. Design parameters in the CSG are optimized with the genetic algorithm (GA). Simulation study shows the effectiveness of the approach.

A New CRONE Suspension: More Compact and More Efficient: Part 1—Problematics and Specifications

2009 ◽  
Author(s):  
Audrey Rizzo ◽  
Xavier Moreau ◽  
Alain Oustaloup ◽  
Vincent Hernette
Keyword(s):  
Suspension System ◽  
Technological Structure ◽  
Set Up ◽  
Crone Suspension

This paper presents, in 2 parts, a new CRONE suspension approach. The first part defines the problematics in suspension and gives the different conditions to overcome it. Then in the second paper a new CRONE suspension system is synthesized based on the conclusion of this paper. So, here, is presented how the variations of mass act on the classical suspension and how tools can be set up to simulate the influence of this variation without to choose the technological structure. Then a criterion on the level of wheel holding is established.

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