A Pneumatic On-Off Vehicle Suspension System

1977 ◽  
Vol 99 (2) ◽  
pp. 130-136 ◽  
Author(s):  
D. L. Klinger ◽  
A. J. Calzado
Keyword(s):  
Vibration Isolation ◽  
Relative Displacement ◽  
Disturbance Attenuation ◽  
Vehicle Suspension ◽  
System Complexity ◽  
Pressure Transducers ◽  
Control Signals ◽  
Pneumatic Suspension ◽  
Simulation Results ◽  
Vehicle Suspension System

An active, nonlinear, pneumatic suspension applicable to passenger railcars is described. Standard on-off valves modulate pressure differences between dual opposing airbags to attenuate vibration and create guidance forces. Improved vibration isolation over that of conventional passive suspensions is achieved at low power levels. Guidance forces are provided with small suspension travel using short bursts of compressed air taken from vehicle supply reservoirs. Acceleration, relative displacement, and pressure transducers provide the control signals required for stabilization, feedforward guidance commands, and disturbance attenuation. Simulation results indicate that performance comparable to hydraulic servosystems can be attained with substantially reduced system complexity and power requirements.

Digital Controller Design for Half-Car Active Suspension System with Using Singular Perturbation Theory

2011 ◽  
Vol 403-408 ◽  
pp. 4800-4805 ◽  
Author(s):  
A. R. Paarya ◽  
H. Zarabadipour
Keyword(s):  
Perturbation Theory ◽  
Controller Design ◽  
Suspension System ◽  
Digital Controller ◽  
Singular Perturbation Theory ◽  
Vehicle Suspension ◽  
Car Model ◽  
Perturbed Systems ◽  
Simulation Results ◽  
Vehicle Suspension System

In this paper the digital controller design for vehicle suspension system, based on a half-car model using singular perturbed systems is considered. This strategy is based on the slow and fast subsystems controller design. The simulation results show them favorable performance of the controller and achieve fast and good response.

Servovalve-Controlled Pneumatic Suspensions

1979 ◽  
Vol 21 (1) ◽  
pp. 7-18 ◽  
Author(s):  
E. Esmailzadeh
Keyword(s):  
Relative Displacement ◽  
Suspension System ◽  
The Body ◽  
Analogue Computer ◽  
Surge Tank ◽  
Low Frequencies ◽  
Ground Vehicle ◽  
Pneumatic Suspension ◽  
Vehicle Suspension System ◽  
Made In

A linear analytical model of a ground-vehicle suspension system employing a pneumatic isolator and a three-way servovalve is developed. Damping is provided by connecting the pneumatic spring to a constant-volume surge tank through capillary resistances. Non-dimensional dynamic equations for the valve-controlled, self-damped, pneumatic isolator are derived and the effects of various feedback and feedforward controls on the performance of the closed-loop system are pointed out. Experiments are conducted to verify the validity of the assumptions made in deriving the absolute and relative displacement transmissibilities and the vehicle model is simulated on an analogue computer. It is shown that a servovalve-controlled pneumatic suspension system not only considerably reduces the body transmissibility at very low frequencies, but is also capable of very good isolation throughout the broad frequency range.

Vibration Isolation by Compliant Sensor Mounting Applied to a Coriolis Mass-Flow Meter

2014 ◽  
Author(s):  
L. (Bert) van de Ridder ◽  
Wouter B. J. Hakvoort ◽  
Johannes van Dijk
Keyword(s):  
Mass Flow ◽  
Flow Measurement ◽  
Vibration Isolation ◽  
Relative Displacement ◽  
Displacement Measurement ◽  
Sensor Element ◽  
Flow Meter ◽  
Displacement Sensors ◽  
Simulation Results ◽  
Coriolis Mass Flow Meter

In this paper a vibration isolated design of the Coriolis Mass-Flow Meter (CMFM) is proposed, by introducing a compliant connection between the casing and the tube displacement sensors with the intention to obtain a relative displacement measurement of the fluid conveying tube, dependent on the tube actuation and mass-flow, but independent of casing excitations. Analyses are focussed on changing the transfer function of support excitations to the relative displacement measurement. The influence of external vibrations on a compliant sensor element and the tube are made equal by tuning the resonance frequency and damping of the compliant sensor element and therefore the influence on the relative displacement measurement is minimised. Based on simulation results, a prototype is built and validated. The validated design show a 20dB reduction of the influence of external vibrations on the mass-flow measurement value of a CMFM, without affecting the sensitivity for mass-flow.

scholarly journals Predictive Control of Vehicle ISD Suspension Based on a Hydraulic Electric Inerter

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Yanling Liu ◽  
Wentao Zhao ◽  
Xiaofeng Yang ◽  
Long Chen ◽  
Yujie Shen
Keyword(s):  
Vibration Isolation ◽  
Passive Control ◽  
Suspension System ◽  
Vehicle Body ◽  
Vehicle Suspension ◽  
Semiactive Control ◽  
Damping Force ◽  
Active Device ◽  
Working Space ◽  
Vehicle Suspension System

As a two-terminal mechanical element, the inerter has been successfully applied in various mechanical fields, such as automotive engineering and civil engineering, for passive control and semiactive control. In this paper, a hydraulic electric inerter is considered an active device to suppress the vibration of a vehicle suspension system. The components and working principle of the hydraulic electric inerter are first introduced. On the basis of a force test of the hydraulic electric inerter, nonlinear factors such as friction, the damping force, and the elastic effect are analyzed, and parameter identification methods are adopted to identify the detailed parameters. A dynamic model of the vehicle suspension system employing a nonlinear hydraulic electric inerter is established, and the predictive controller is designed to further improve the vibration isolation performance of the suspension system. Numerical simulations show that the performance of the vehicle ISD (inerter-spring-damper) suspension system is significantly improved compared to the passive suspension. Finally, bench tests are carried out, and the advantages of vehicle ISD suspension are demonstrated. The RMS (root-mean-square) value of the vehicle body acceleration and the RMS value of the suspension working space are reduced by 16.1% and 8.9%, respectively.

scholarly journals Influential characteristics of electromagnetic parameters on self-powered MR damper and its application in vehicle suspension system

2019 ◽  
Vol 234 (1) ◽  
pp. 38-49
Author(s):  
Xiang Gao ◽  
Junchuan Niu ◽  
Ruihao Jia ◽  
Zhihui Liu
Keyword(s):  
Frequency Domain ◽  
Vibration Isolation ◽  
Passive Control ◽  
Electromagnetic Coupling ◽  
Mr Damper ◽  
Suspension System ◽  
Vehicle Suspension ◽  
Electromagnetic Parameters ◽  
Self Powered ◽  
Vehicle Suspension System

In order to reuse the energy dissipated by magneto-rheological (MR) damper, a self-powered MR damper is designed and analyzed theoretically. The main thrust of this work is establishing the mechanical-electromagnetic coupling model of quarter vehicle suspension based on self-powered MR damper, whilst the energy conversion efficiency of self-powered MR damper with electromagnetic parameters changing is investigated. The magnetic circuit model is formulated firstly. The influence of electromagnetic parameters on current in MR damper is analyzed systemically in frequency domain. A multi-objective optimization method is performed to determine the electromagnetic parameters. Subsequently a quarter vehicle suspension system with self-powered MR damper is introduced. The mechanical-electromagnetic coupling model is established. The frequency response function is derived under random road excitation. The vibration isolation capability of the proposed quarter vehicle suspension system is addressed in time and frequency domain respectively. Compared to passive control, the amplitude of sprung mass velocity, acceleration and transmissibility are reduced by 51%, 78% and about 10 dB in time and frequency domain respectively. Finally the energy conversion efficiency of self-powered MR damper with magnetic parameters changing under random road excitation is discussed. The vibration isolation performance of self-powered MR damper is more effective than passive control, especially in resonance range of the suspension system.

scholarly journals ANALISA KENYAMANAN PADA KENDARAAN MULTIGUNA PEDESAAN DENGAN PEMODELAN 8 DOF

2019 ◽  
Vol 8 (01) ◽  
pp. 19-23
Author(s):  
Nanda Pranandita
Keyword(s):  
Rural Areas ◽  
Simulation Software ◽  
Suspension System ◽  
Vehicle Suspension ◽  
Vertical Acceleration ◽  
Acceleration Response ◽  
Passive Suspension ◽  
Passive Suspension System ◽  
Simulation Results ◽  
Vehicle Suspension System

Vehicle suspension system is an important part to minimize the vibration of the vehicle caused by road unevenness. Ideal conditions would be difficult to obtain, especially in rural areas with uneven road conditions. Analysis of passive suspension system in this study is expected to explain the level of comfort in riding Rural Multipurpose Vehicles. Full car modelling with 1 DOF riders used in this study, simulated using numerical simulation software. Excitation roads used in the form of a sinusoidal wave with an amplitude of 0.05 m and a wavelength of 0.5 m. Analysis carried out on the comfort of the vertical acceleration response received driver’s head. Based on the simulation results showed that by using a constant speed between 20-40 km / h, the vehicle will be comfortable driving for more than 2.5 hours.

Robust Reliable Control for Uncertain Vehicle Suspension Systems With Input Delays

2014 ◽  
Vol 137 (4) ◽  
Author(s):  
R. Sakthivel ◽  
A. Arunkumar ◽  
K. Mathiyalagan ◽  
S. Selvi
Keyword(s):  
Sufficient Conditions ◽  
Suspension System ◽  
Disturbance Attenuation ◽  
Vehicle Suspension ◽  
Linear Matrix ◽  
Suspension Systems ◽  
Suspension Model ◽  
Vehicle Suspension System ◽  
Input Delays ◽  
Active Vehicle Suspension System

Synthesis of control design is an essential part for vehicle suspension systems. This paper addresses the issue of robust reliable H∞ control for active vehicle suspension system with input delays and linear fractional uncertainties. By constructing an appropriate Lyapunov–Krasovskii functional, a set of sufficient conditions in terms of linear matrix inequalities (LMIs) are derived for ensuring the robust asymptotic stability of the active vehicle suspension system with a H∞ disturbance attenuation level γ. In particular, the uncertainty appears in the sprung mass, unsprung mass, damping and stiffness parameters are assumed in linear fractional transformation (LFT) formulations. More precisely, the designed controller is presented in terms of the solution of LMIs which can be easily checked by Matlab-LMI toolbox. Finally, a quarter-car suspension model is considered as an example to illustrate the effectiveness and applicability of the proposed control strategy.

Simulation Model of the Dynamic Behavior of a Tire Running Over an Obstacle

1988 ◽  
Vol 16 (2) ◽  
pp. 62-77 ◽  
Author(s):  
P. Bandel ◽  
C. Monguzzi
Keyword(s):  
Simulation Model ◽  
Dynamic Behavior ◽  
Black Box ◽  
Box Model ◽  
Vehicle Suspension ◽  
Empirical Relationships ◽  
Static Tests ◽  
High Speeds ◽  
Dynamic Forces ◽  
Vehicle Suspension System

Abstract A “black box” model is described for simulating the dynamic forces transmitted to the vehicle hub by a tire running over an obstacle at high speeds. The tire is reduced to a damped one-degree-of-freedom oscillating system. The five parameters required can be obtained from a test at a given speed. The model input is composed of a series of empirical relationships between the obstacle dimensions and the displacement of the oscillating system. These relationships can be derived from a small number of static tests or by means of static models of the tire itself. The model can constitute the first part of a broader model for description of the tire and vehicle suspension system, as well as indicating the influence of tire parameters on dynamic behavior at low and medium frequencies (0–150 Hz).

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