Constrained $$H_{\infty }$$ H ∞ Control for Active Suspensions

2019 ◽  
pp. 15-46
Author(s):  
Weichao Sun ◽  
Huijun Gao ◽  
Peng Shi
Keyword(s):  
Active Suspensions

A road-adaptive control law for semi-active suspensions

1999 ◽  
Vol 13 (10) ◽  
pp. 667-676 ◽  
Author(s):  
Youngjoo Cho ◽  
Byung Suk Song ◽  
Kyongsu Yi
Keyword(s):  
Adaptive Control ◽  
Control Law ◽  
Active Suspensions ◽  
Adaptive Control Law

Application of Practical Observer to Semi-Active Suspensions

1998 ◽  
Vol 122 (2) ◽  
pp. 284-289 ◽  
Author(s):  
H. Nakai ◽  
S. Oosaku ◽  
Y. Motozono
Keyword(s):  
Ride Comfort ◽  
Difficult Problem ◽  
Nonlinear Observer ◽  
Vertical Acceleration ◽  
Acceleration Sensor ◽  
Active Suspensions ◽  
Linear Observer ◽  
Gain Scheduled

This paper presents the development of gain-scheduled observers for semi-active suspensions. The states of the semi-active suspensions must be accurately obtained because the accuracy directly affects system performances such as ride comfort. Nonlinearity in the absorber of the semi-active suspensions is a difficult problem for estimating the accurate states using conventional linear observer theories. To solve this problem, we have designed a new gain-scheduled observer by introducing two improvements. The validity of this nonlinear observer was confirmed by simulations and experiments. The results indicate that the present observer can accurately estimate the suspension stroke velocity using the vertical acceleration sensor on the sprung mass. [S0022-0434(00)02302-9]

IMPROVEMENT OF VERY HIGH SPEED TRAINS COMFORT WITH PREVIEW SEMI-ACTIVE SUSPENSIONS

1992 ◽  
Vol 20 (sup1) ◽  
pp. 299-313 ◽  
Author(s):  
L. Jezequel ◽  
V. Roberti ◽  
B. Ouyahia ◽  
Y. Toutain
Keyword(s):  
High Speed ◽  
Active Suspensions ◽  
High Speed Trains ◽  
Very High

scholarly journals FxLMS Method for Suppressing In-Wheel Switched Reluctance Motor Vertical Force Based on Vehicle Active Suspension System

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Yan-yang Wang ◽  
Yi-nong Li ◽  
Wei Sun ◽  
Chao Yang ◽  
Guang-hui Xu
Keyword(s):  
Vertical Component ◽  
Active Suspension ◽  
Radial Force ◽  
Suspension System ◽  
Vertical Force ◽  
Least Mean Square ◽  
Active Suspensions ◽  
Switched Reluctance ◽  
Resonance Frequencies ◽  
Suspension Performance

The vibration of SRM obtains less attention for in-wheel motor applications according to the present research works. In this paper, the vertical component of SRM unbalanced radial force, which is named as SRM vertical force, is taken into account in suspension performance for in-wheel motor driven electric vehicles (IWM-EV). The analysis results suggest that SRM vertical force has a great effect on suspension performance. The direct cause for this phenomenon is that SRM vertical force is directly exerted on the wheel, which will result in great variation in tyre dynamic load and the tyre will easily jump off the ground. Furthermore, the frequency of SRM vertical force is broad which covers the suspension resonance frequencies. So it is easy to arouse suspension resonance and greatly damage suspension performance. Aiming at the new problem, FxLMS (filtered-X least mean square) controller is proposed to improve suspension performance. The FxLMS controller is based on active suspension system which can generate the controllable force to suppress the vibration caused by SRM vertical force. The conclusion shows that it is effective to take advantage of active suspensions to reduce the effect of SRM vertical force on suspension performance.

The Effect of Bandwidth of Semiactive Dampers on Vehicle Ride

1993 ◽  
Vol 115 (3) ◽  
pp. 571-575 ◽  
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.

Automotive active suspensions Part 2: Practical considerations

1997 ◽  
Vol 211 (6) ◽  
pp. 427-444 ◽  
Author(s):  
R A Williams
Keyword(s):  
State Feedback ◽  
Feedback Controller ◽  
Active Suspensions ◽  
Passive Components ◽  
Body Acceleration ◽  
State Feedback Controller ◽  
Conflicting Demands ◽  
High Bandwidth ◽  
Practical Implications ◽  
Ride And Handling

Part 1 of the paper demonstrated the compromises required in suspension design brought about by the conflicting demands of ride and handling, and the constraints applied by the need to minimize body acceleration within a limited suspension travel. It then went on to show how a state feedback controller can be used to provide improvements in ride which are not achievable with standard passive components. This second part discusses the hardware employed, which ranges from simple switched dampers, through semi-active dampers, and low-bandwidth/soft active suspensions, to high-bandwidth/stiff active suspensions. The benefits to be derived from each of the technologies is assessed, together with the practical implications.

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