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Fuzzy logic control of active suspension system equipped with a hydraulic actuator

Al-Ashtari Waleed

International Journal of Applied Mechanics and Engineering

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2023

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Vol. 28, no. 3

13--27

EN

In this paper, the Active Suspension System (ASS) of road vehicles was investigated. In addition to the conventional stiffness and damper, the proposed ASS includes a fuzzy controller, a hydraulic actuator, and an LVDT position sensor. Furthermore, this paper presents a nonlinear model describing the operation of the hydraulic actuator as a part of the suspension system. Additionally, the detailed steps of the fuzzy controller design for such a system are introduced. A MATLAB/Simulink model was constructed to study the proposed ASS at different profiles of road irregularities. The results have shown that the proposed ASS has superior performance compared to the conventional Passive Suspension System (PSS), where the body displacement can be minimized to about 70.1 % and the settling time is reduced to about 48.4 %. Also, the results have shown that the actuator force can reach 68 % of the body weight under the worst studied road conditions.

2

A review of the vehicle suspension system

Jiregna Iyasu, Sirata Goftila

Journal of Mechanical and Energy Engineering

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2020

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Vol. 4, No 2

109--114

EN

The driving comfort of the vehicle is primarily determined by the design of the suspension system, which transmits the force between the vehicle and the ground. There are different types of vehicle suspension systems, including active suspension systems that provide significant benefits for ride comfort while driving. However, the existing active suspension systems have limited functions such as power, and also complex structure. To overcome the problem, the proper design of the active suspension system by considering its present limitations is essential. A well-designed active suspension system controls the load on the wheels under the resonance of the body structure and ensures driving comfort. It reduces the vibrational energy of the vehicle body caused by the excitation of the road while keeping the stability of the vehicle within an acceptable limit. For a proper design of the active suspension system, the road surface, the seat suspension, and the wheel load are the most important elements to consider. In this study, different types of vehicle suspension systems with their limitations have been thoroughly investigated. Many aspects of control and some of the essential practical considerations are also explored.

3

Vibration control and performance analysis of full car active suspension system using fractional order terminal sliding mode controller

Yuvapriya T., Lakshami P., Rajendiran S.

Archives of Control Sciences

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2020

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Vol. 30, No. 2

295--324

EN

The main goal of introducing Active Suspension System in vehicles is to reduce the vehicle body motion under road obstacles which improves the ride comfort of the passenger. In this paper, the Full Car Model (FCM) with seven Degrees of Freedom is considered and simulated by MATLAB/Simulink. The Terminal Sliding Mode Controller (TSMC) and Fractional Order Terminal Sliding Mode Controller (FOTSMC) are designed to enhance the ride quality, stability and passenger comfort for FCM. The designed FOTSMC has the ability to provide higher control accuracy in a finite time. The performances of the designed controllers are evaluated by measuring the vehicle body vibration in both angular and vertical direction under bump input and ISO-8608 random input against passive suspension system. The Frequency Weighted Root Mean Square (FWRMS) and Vibration dose value of Body Acceleration as per ISO-2631 are evaluated for FOTSMC, TSMC and PSS. The stability of the FCM is proved by Lyapunouv theory. Further analysis with sprung mass and speed variation of FCM demonstrate the robustness of proposed controller. To investigate the performances of designed controllers, comparison is made with existing Sliding Mode Controller (SMC) which proves that the designed FOTSMC performs better than existing SMC.

4

Modelling and control of an electro-hydraulic active suspension system

Ajala O., Bestle D., Rauh J.

Archive of Mechanical Engineering

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2013

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Vol. LX, nr 1

37--54

EN

Active suspension systems ease the conflict between comfort and handling. This requires the use of suitable actuators that in turn need to be efficiently controlled. This paper proposes a model-based control approach for a nonlinear suspension actuator. Firstly the concept is derived in the linear framework in order to simplify the synthesis and analysis phase. There a linear model of the actuator is proposed and discussed. Further, this design phase includes a comparison between model-free PID controllers and a newly proposed two-degree-of-freedom controller which allows one to shape reference and disturbance responses separately. Subsequently, the two-degree-of-freedom controller, which proves to be superior, is adapted to the nonlinear framework by considering a linear parameter varying representation of the nonlinear plant. Finally, the nonlinear controller is implemented in a test car confirming the concept applicability to real hardware.

PL

Aktywne systemy zawieszenia łagodzą konflikt między komfortem a właściwościami jezdnymi samochodu. Wymagają one użycia odpowiednich siłowników, a te z kolei powinny być efektywnie sterowane. W artykule zaproponowano opartą na modelowaniu koncepcję sterowania nieliniowego siłownika w zawieszeniu samochodu. Koncepcja tego rozwiązania jest początkowo przedstawiona w ramach opisu liniowego, co ma uprościć fazę syntezy i analizy. Na tym etapie jest proponowany i dyskutowany model liniowy. Ta faza projektowania obejmuje ponadto porównanie między niezwiązanymi z modelem sterownikami PID i proponowanym, nowym sterownikiem o dwu stopniach swobody, który pozwala niezależnie kształtować odpowiedź referencyjną i odpowiedź na zakłócenia. W dalszym etapie, dla sterownika o dwu stopniach swobody, który okazał sie lepszy od pozostałych, wprowadza się opis nieliniowy, traktując parametr liniowy jak zmienną reprezentację nieliniowego obiektu regulacji. Ostatecznie, nieliniowy sterownik zawieszenia jest instalowany w samochodzie testowym, a badania potwierdzają celowość zastosowania tej koncepcji w rzeczywistym sprzęcie.