Non-linear modelling and control of semi-active suspensions with variable damping

This paper deals with non-linear modelling and control of a differential hydraulic actuator. The nonlinear state space equations are derived from basic physical laws. They are more powerful than the transfer function in the case of linear models, and they allow the application of an object oriented approach in simulation programs. The effects of all friction forces (static, Coulomb and viscous) have been modelled, and many phenomena that are usually neglected are taken into account, e.g., the static term of friction, the leakage between the two chambers and external space. Proportional Differential (PD) and Fuzzy Logic Controllers (FLC) have been applied in order to make a comparison by means of simulation. Simulation is performed using Matlab/Simulink, and some of the results are compared graphically. FLC is tuned in a such way that it produces a constant control signal close to its maximum (or minimum), where possible. In the case of PD control the occurrence of peaks cannot be avoided. These peaks produce a very high velocity that oversteps the allowed values.

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Non-linear Modelling and Control of Self-Balancing Human Transporter

Perspectives in Dynamical Systems II: Mathematical and Numerical Approaches - Springer Proceedings in Mathematics & Statistics ◽

10.1007/978-3-030-77310-6_1 ◽

2021 ◽

pp. 1-16

Author(s):

Saransh Jain ◽

Sarthak Jain ◽

Mohit Makkar

Keyword(s):

Linear Modelling ◽

Non Linear ◽

And Control

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Structure and Parameter Identification of a Batch Fermentation Process using Non-Linear Modelling

1993 American Control Conference ◽

10.23919/acc.1993.4793288 ◽

1993 ◽

Cited By ~ 1

Author(s):

M. Keulers

Keyword(s):

Parameter Identification ◽

Batch Fermentation ◽

Fermentation Process ◽

Linear Modelling ◽

Non Linear

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Non-linear moving horizon state estimation and control for the superfluid helium cryogenic circuit at the large Hadron Collider

53rd IEEE Conference on Decision and Control ◽

10.1109/cdc.2014.7039937 ◽

2014 ◽

Cited By ~ 2

Author(s):

Rafal Noga ◽

Cesar de Prada ◽

Toshiyuki Ohtsuka ◽

Enrique Blanco ◽

Juan Casas

Keyword(s):

Large Hadron Collider ◽

State Estimation ◽

Superfluid Helium ◽

Hadron Collider ◽

Non Linear ◽

Estimation And Control ◽

And Control

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Non-linear modelling and optimal control of a hydraulically actuated seismic isolator test rig

Mechanical Systems and Signal Processing ◽

10.1016/j.ymssp.2012.09.002 ◽

2013 ◽

Vol 35 (1-2) ◽

pp. 255-278 ◽

Cited By ~ 16

Author(s):

Stefano Pagano ◽

Riccardo Russo ◽

Salvatore Strano ◽

Mario Terzo

Keyword(s):

Optimal Control ◽

Test Rig ◽

Seismic Isolator ◽

Linear Modelling ◽

Non Linear ◽

Hydraulically Actuated

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Non-linear modelling using central composite design to predict green sand mould properties

Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture ◽

10.1243/09544054jem696 ◽

2007 ◽

Vol 221 (5) ◽

pp. 881-895 ◽

Cited By ~ 22

Author(s):

M B Parappagoudar ◽

D K Pratihar ◽

G L Datta

Keyword(s):

Central Composite Design ◽

Green Sand ◽

Linear Modelling ◽

Non Linear ◽

Sand Mould ◽

Central Composite

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The Effect of Bandwidth of Semiactive Dampers on Vehicle Ride

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.2899142 ◽

1993 ◽

Vol 115 (3) ◽

pp. 571-575 ◽

Cited By ~ 6

Author(s):

J. Lieh

Keyword(s):

Fourier Transform ◽

Significant Influence ◽

Switching Time ◽

Control Valve ◽

Mean Square ◽

Active Suspensions ◽

Car Model ◽

Frequency Responses ◽

And Control ◽

Valve Switching

A passenger car model with a full car body and four wheel-axle assemblies is used to investigate the influence of semiactive suspensions on ride performance. Mean square values are evaluated for various damping levels and control valve switching times. Due to severe nonlinearities, frequency responses are not obtained directly. They are reconstructed from Fast Fourier Transform (FFT) using a Hanning window. The results are compared with those from LQR active suspensions and pure on-off dampers. The effect of control valve switching time (bandwidth) is studied and shows a significant influence on the vehicle ride, suspension travels, and tire deflections.

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