RESEARCH PAPERS

suspension system research papers




Fuzzy control of a quarter-car suspension system
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ABSTRACT An active suspension system has been proposed to improve the ride comfort. A quarter-car 2 degree-of-freedom (DOF) system is designed and constructed on the basis of the concept of a four-wheel independent suspension to simulate the actions of an active 

Distributed control of a car suspension system
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ABSTRACT Active suspension control system are used in today cars because of their ability to manage the compromise between ride comfort and vehicle road-handling. They constitute a typical example of distributed control systems. In this paper, the ride controller part of an 

A new model and an optimal pole-placement control of the Macpherson suspension system
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ABSTRACT In this paper a new model and an optimal pole-placement control for the Macpherson suspension system are investigated. The focus in this new modeling is the rotational motion of the unsprung mass. The two generalized coordinates selected in this 

SIMULATION OF SUSPENSION SYSTEM WITH ADAPTIVE FUZZY ACTIVE FORCE CONTROL
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ABSTRACT This paper presents the design of a control technique applied to an active suspension system of a quarter car model using adaptive fuzzy (AF) logic and active force control (AFC) technique. The overall control system comprises three loops: the inner 

Vibration isolation system using zero-power magnetic suspension
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ABSTRACT A new vibration isolation system is proposed which uses zero-power magnetic suspension. Since a zero-power system behaves as if it has a negative stiffness, combining it with a normal spring can generate infinite stiffness against disturbances on the isolation 

Comparison between optimized passive vehicle suspension system and semi active fuzzy logic controlled suspension system regarding ride and handling
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ABSTRACT The purpose of suspension system in automobiles is to improve the ride comfort and road handling. In this research the ride and handling performance of a specific automobile with passive suspension system is compared to a proposed fuzzy logic semi 

Integral suspension system for motor vehicles based on passive components
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ABSTRACT This paper presents the theory and results of a passive suspension system implementation that links the four wheels vertical movements through a central device. This arrangement is made to define a passive kinematics link between all wheels vertical 

Vibration analysis of a vehicle body and suspension system using a substructure synthesis method
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In this paper, a computational model for a vehicle system, consisting of a vehicle body, suspension systems and tyres, is presented along with an associated computational procedure to analyse the frequency response characteristics on a PC. The constituent 

Neural network based feedback linearization control of a servo-hydraulic vehicle suspension system
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This paper presents the design of a neural network based feedback linearization (NNFBL) controller for a two degree-of-freedom (DOF), quarter-car, servo-hydraulic vehicle suspension system. The main objective of the direct adaptive NNFBL controller is to 

Experimental testing and mathematical modeling of the interconnected hydragas suspension system
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ABSTRACT The Moulton Hydragas suspension system improves small car ride quality by interconnecting the front and rear wheel on each side of the vehicle via a hydraulic fluid pipe between the front and rear dampers. A Hydragas system from a Rover Group MGF sports 

A new modeling of the Macpherson suspension system and its optimal pole-placement control
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ABSTRACT In this paper a new model and an optimal pole-placement control for the Macpherson suspension system are investigated. The focus in this new modeling is the rotational motion of the unsprung mass. The two generalized coordinates selected in this 

Tuning of an active suspension system using a fractional controller and a closed-loop tuning
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ABSTRACT This paper presents the design of the controller of an active suspension system. Such a system begins to be used in automotive applications, for example to isolate the engine from the chassis. A restricted-complexity controller is initially designed using the 

Fuzzy sliding mode control of a magnetic ball suspension system
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Sliding mode control [15, 16] has attracted a great deal of attention in recent years because it is proven as a powerful tool for nonlinear robust control design. It is an effective and robust technology for rejecting parameter variations and external disturbances. It has been 

LQG/LTR ROBUST SEMI-ACTIVE SUSPENSION CONTROL SYSTEM USING MAGNETO-RHEOLOGICAL DAMPERS
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ABSTRACT This work presents the complete design of a semi-active suspension control system for a Sport Utility Vehicle (SUV). The main control objective is the performance improvement in comfort and safety features of the vehicle. The design is based on a LQG/LTR robust 

Optimization of Sliding Mode Control for a Vehicle Suspension System via Multi-objective Genetic Algorithm with Uncertainty
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In this paper, Sliding Mode Controller (SMC) is designed for a quarter-car active suspension system with parametric uncertainty in the mass of vehicle body and also Genetic Algorithms are employed to find optimal parameters of controller. An ideal suspension must be able 

Vibration effects of bumper suspension system on pipeline sensor-based platform for soil water monitoring
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ABSTRACT This work examines the dynamic vibrational behavior of a bumper suspension system which is part of a sensor-based platform. The sensor-based platform travels through an underground pipeline system and monitors the soil water content in real time. The 

Robust Pareto Points with Respect to Crosswind of an Active Suspension System
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Summary: In this work, the optimization of control parameters for an active suspension system is considered. Here, two objectives–energy and comfort–play an important role. Thus, a multiobjective optimization problem is formulated which can be solved numerically 

Hexagonal Geometrical Inclusion to Estimate Effective Thermal Conductivity (ETC) of PorousSystem and Suspension system Including the Effect of Natural
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ABSTRACT In this present work, a numerical model of hexagonal geometrical inclusion is developed to estimate the Effective Thermal Conductivity (ETC) of the two-phase materials taking the natural convection into account. A 2-D Constant Cross Section of unit cell model 

Modeling and control design for a semi-active suspension system with magnetorheological rotary brake
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ABSTRACT In this paper we will first propose some methods for controlling a semi active suspension (SAS). The SAS with a magnetorheological rotary (MR) damper is highly nonlinear and is hard to control. To make the controller, the system is slightly modified and 

Robust Sliding Mode Control of Electromagnetic Suspension System with Parameter Uncertainty
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ABSTRACT Due to the nonlinearities inherent in electromagnetic suspension systems, it is difficult to design a linear controller which gives satisfactory performance and stability over a wide range of operating points. Besides, uncertainties in modeling of the system make it 

Optimization of a passive vehicle suspension system for ride comfort enhancement with different speeds based on design of experiment method (DOE) method
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This paper reported on an investigation to determine the spring and damper settings that ensured optimal ride comfort of vehicle in different speeds using design of experiment method (DOE). The extent to which the ride comfort optimal suspension settings vary for 

Adaptive Fuzzy Wavelet NN Control Strategy for Full Car Suspension System
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In the last few years, different linear and non-linear control techniques have been applied by many researchers on the vehicle suspension system. The basic purpose of suspension system is to improve the ride comfort and better road handling capability. Therefore, a 

LQG Control of a Semi-active Suspension System equipped with MR rotary brake
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ABSTRACT This paper deals with analyzing LQG control to mitigate vibrations in a semi-active suspension system (SAS) equipped with an MR rotary brake. The results of various simulations are studied and compared to the real system. Keywords: LQG control, MR 

Robust adaptive sliding mode controller for semi-active vehicle suspension system
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ABSTRACT For the tracking control problem of vehicle suspension, a robust design method of adaptive sliding mode control is derived in this paper. The influence of parameter uncertainties and external disturbances on the system performance can be reduced and 

Vehicle Suspension System Control by using Adaptive Fuzzy Controller
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ABSTRACT Fuzzy logic based control systems provide a simple and efficient method to control highly complex and imprecise systems. However, the lack of a simple hardware design that is capable of modifying the fuzzy controller's parameters to adapt for any 

NARMA-L2 Control of a Nonlinear Half-Car Servo-Hydraulic Vehicle Suspension System
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ABSTRACT In this paper, the performance of a nonlinear, 4 degrees-of-freedom, servohydraulic half-car active vehicle suspension system is compared with that of a passive vehicle suspension system with similar model parameters. The active vehicle suspension system 

Stability Analysis and Internal Dynamics of a MIMO Half-Car Active Suspension System
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ABSTRACT In this paper, stability and internal dynamics of a half car model is studied. The half- car model is considered as a nonlinear MIMO system and input-output feedbac linearization method will be applied for control purpose. Internal dynamics is the unobservable part of 

Nonlinear control of semi-active macpherson suspension system
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ABSTRACT This paper presents the control design and analysis of a nonlinear model of a MacPherson suspension system equipped with a magnetorheological (MR) damper. The model suspension considered incorporates the kinematics of the suspension linkages. An 

A new variable stiffness suspension system: passive case
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ABSTRACT This paper presents the design, analysis, and experimental validation of the passive case of a variable stiffness suspension system. The central concept is based on a recently designed variable stiffness mechanism. It consists of a horizontal control strut and 

Robust Sliding Mode Fuzzy Control of a Car Suspension System
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ABSTRACT Different characteristics can be considered in a suspension system design like: ride comfort, body travel, road handling and suspension travel. No suspension system can optimize all these parameters together but a better tradeoff among these parameters can 

Selection of Sensors for Hydro-Active Suspension System of Passenger Car With Input–Output Pairing Considerations
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With respect to weight, energy consumption, and cost constraints, hydro-active suspension system is a suitable choice for improving vehicle ride comfort while keeping its handling. The aim of sensors selection is determining number, location, and type of sensors, which are 

Suspension System Concepts
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With two wheels mounted together on a single wheel carrier, as on a rigid beam axle (d), the suspension requires two degrees of freedom so that each wheel will have one degree of freedom. The necessary design will permit the axle both parallel travel and rolling motion 

Model-Free Sliding Mode Fuzzy Controller with Minimum Rule Base Implemented on BusSuspension System
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ABSTRACT Although both fuzzy logic controller and sliding mode controller have admirable characteristics, they have some disadvantages when are used individually. To eliminate these disadvantages, a sliding mode fuzzy controller (SMFC) is proposed and is applied 

Road Condition Predicting with Kalman Filter for Magneto-Rheological Damper inSuspension System
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ABSTRACT This thesis develops a new way to predict the road roughness with Kalman filter. It suggests applying the Kalman filter to predict road condition in suspension system. According to the literature review and to the knowledge of authors, no similar applications 

Static and fatigue analysis of multi leaf spring used in the suspension system of LCV
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ABSTRACT The leaf spring is widely used in automobiles and one of the components of suspension system. It needs to have excellent fatigue life. As a general rule, the leaf spring must be regarded as a safety component as failure could lead to severe accidents. The 

Analysis of Lower Control Arm in Front Suspension System Using FEA Approach
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ABSTRACT This paper deals with finite element analysis for MacPherson type suspension system lower control arm (LCA) of 4W suspension system. The main function of the lower control arm is to manage the motion of the wheelskeep it relative to the body of the 

Theoretical and experimental fuzzy control on vehicle pneumatic semi-active suspension system
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ABSTRACT Semi-active suspension system is a possible way to improve suspension performance although the passive system can effectively handle some control of suspension system. The main propose of this paper is to assess performance of semi-active 

Bio-Plex  suspension array system
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Method The principle of the Bio-Plex Pro bead-based assays is similar to capture sandwich immunoassays (Zhou and Geng 2011, Yeung et al. 2011). The capture antibody-coupled beads are first incubated with the sample followed by incubation with biotinylated 

809. Geometry optimization of double wishbone suspension system via genetic algorithm for handling improvement
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ABSTRACT Motion control, stability maintenance and ride comfort improvement are fundamental issues in design of suspension systems in off-road vehicles. In this paper, a double wishbone (DW) suspension system, mostly used in off-road vehicles, is modeled 

Advanced Magnetic Suspension and Balance System Having Characteristics of Light Weight, Electric Power Saving, and Fast Response
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We have developed an advanced magnetic suspension and balance system (MSBS), in which iron yokes are not used and a pair of strong magnets are installed to generate magnetic force compensating gravitational force applied to the aerodynamic models. By 

In vitro Proliferation of Mononucleated Suspension and Adherent Cells from Mouse and Human Peripheral Blood System
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ABSTRACT Primary cells have a limited proliferative capacity with a finite number of times as compared with cell line which can grow indefinitely. Therefore, this study was carried out to identify the proliferative capacity of primary mononucleated cells from mouse and human. 

Preparation of Ultrafine Zirconia Suspension Using Glutin-Urea Gelcasting System
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ABSTRACT Glutin-urea system was used to prepare ultrafine zirconia suspension for gelcasting. Premixed solution was prepared at deionized water/glutin/urea ratio of 90/10/5 (by weight). Adjusting pH value to11, zirconia powders and A-type dispersant (polyacrylic 

Design and Development of PID Controller-Based Active Suspension System for Automobiles
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Suspension systems have been widely applied to vehicles, right from the horse-drawn carriage with flexible leaf springs fixed at the four corners, to the modern automobile with complex control algorithms. Every vehicle moving on the randomly profiled road is 

IDENTIFICATION OF CAR SUSPENSION SYSTEM PARAMETERS ON THE BASIS OF EXPLOITATIONAL MEASUREMENTS
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Summary The paper concerns exploitational identification of structural parameters of the Toyota Camry suspension system. Analysis was carried out by means of the output-only nonlinear system identification method for vibration accelerations recorded along the 

FUZZY CONTROL STRATEGY FOR THE LOW BANDWIDTH ACTIVE SUSPENSION SYSTEM
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ABSTRACT In this study, we propose new control strategies for the control of an electrohydraulically controlled active suspension system. A PID, along with fuzzy control is employed to form a switch between bump isolation and inertial load rejection strategies. 

Semi-active Suspension System Modelling and Parameters Identification
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Automotive vehicle suspension has been a subject of research interest both in academia and industry for many years. Modern car suspension systems can be divided into three groups: passive, semi-active and active. Most conventional cars are equipped with the first 

Design and Characterization of Multi-Stage Suspension Concentration System
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SUMMARY A process flow for removing cryptosporidium from water, involving an acoustic stage and DEP stage, will be introduced in this thesis. In this thesis, a multi stage suspension concentration system was constructed for the acoustic stage. A 3-stage 

air suspension system

Application of Rouse's Sediment Concentration Profile to Aeolian Transport: Is thesuspension system for sand transport in air the same as that in water
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In this study, the applicability of Rouse's suspended sediment concentration profile for fluvial transport to aeolian transport was shown and a universal system of suspended sand transport in water and air was investigated, in order to obtain knowledge of suspended

Design and Development of a Low Cost Rapid Control Prototyping System Applied to an Air Suspension System
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Abstract: A low cost and easy to use rapid control prototyping system which is based on the Arduino Uno, Matlab/Simulink and hardware-and software-add-ons is introduced. Design and development of the hardware-and software-add-ons is described and the rapid

Life Prediction Based on Transient Dynamics Analysis of Van Semi-trailer with Air Suspension System
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Abstract: The early fatigue damage in the vanbody of the semitrailer is often caused by the unique mechanical characteristics and the dynamic impact of the loads. The traditional finite element method with static strength analysis cannot support the fatigue design of vanbody

An Ultra-low Frequency Modal Testing Suspension System for High Precision Air Pressure Control
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Abstract: As a resolution for air pressure control challenges in ultra-low frequency modal testing suspension systems, an incremental PID control algorithm with dead band is applied to achieve high-precision pressure control. We also develop a set of independent

Air Suspension Coupled with Rotary Damper
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ABSTRACT An air suspension system is an excellent anti-vibration device due to its low dynamic modulus; however in some cases the damping is insufficient to meet requirements even if equipped with an additional air tank and an orifice to enhance the loss stiffness.

Shikimic acid (Tamiflu precursor) production in suspension cultures of East Indian sandalwood (Santalum album) in air-lift bioreactor
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Abstract Shikimic acid is the key precursor for industrial synthesis of the potent neuraminidase inhibitor, oseltamivir (Tamiflu) that has tremendous importance in the treatment of flu. Plant and microbial sources are the only sources of shikimic acid. We

Air bubble trajectories in polymeric solution and crystal suspension
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ABSTRACT The experimental results of bubble trajectory in xanthan gum solution, xanthan gum crystal suspension and water are presented in this paper. The suspension was made of 0.05% concentration of xanthan gum solution with 1%(by weight) of 0.23 mm polystyrene

Usage of active sludge and active carbon suspension in the biological air purification
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A vast variety of air-purificationmethodsarebeingusedworldwide. Thefollowingare the main features determining the choice of a method: a high cleaning efficiency, formation of non- harmful splitting products, and a low price. Biological air cleaning equipment charged with

Application of Rouse's Sediment Concentration Profile to Aeolian Transport: Is thesuspension system for sand transport in air the same as that in water
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In this study, the applicability of Rouse's suspended sediment concentration profile for fluvial transport to aeolian transport was shown and a universal system of suspended sand transport in water and air was investigated, in order to obtain knowledge of suspended

Force-Controlled Air Spring Suspension
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Abstract: While the damping of a common cabin of a commercial vehicle is realized with hydraulic based dampers integrated into the air springs of the suspension, the damping forces of the force-controlled air spring are generated by varying the mass of air inside the

Suspension forces on a tri-axle air suspended semi-trailer
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Page 1. Suspension forces on a tri-axle air suspended semi-trailer Cor-Jacques Kat 12 February 2009 Page 2. Scope Introduction Experimental work Air spring model Full vehicle simulation model Conclusion Page 3. Introduction Aim Create validated MBS model

Electromechanical Analogy Approach to Modeling and Analysis of Air Suspension with Auxiliary Chamber
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Abstract: In order to effectively avoid the complexity and difficulty in analyzing the differential equations during the modeling process of air suspensions with auxiliary air chambers, electromechanical similarity theories were introduced, an equivalent electrical model was

Air Suspension Characterization. Increasing Air Suspension Effectiveness by means of a variable area orifice
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ABSTRACT The air spring is one of the components that affects vehicle comfort. This element usually makes up the main part of the secondary suspension, which introduces both stiffness and damping between the bogie and the car body. Therefore, a deep


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