The Development Of Active Vehicle Suspension Systems
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The Development Of Active Vehicle Suspension Systems
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Author : R. J. Aird
language : en
Publisher:
Release Date : 1972
The Development Of Active Vehicle Suspension Systems written by R. J. Aird and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with categories.
Vehicle Suspension Systems And Electromagnetic Dampers
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Author : Saad Kashem
language : en
Publisher: Springer
Release Date : 2017-09-04
Vehicle Suspension Systems And Electromagnetic Dampers written by Saad Kashem and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-09-04 with Technology & Engineering categories.
This book describes the development of a new analytical, full-vehicle model with nine degrees of freedom, which uses the new modified skyhook strategy (SKDT) to control the full-vehicle vibration problem. The book addresses the incorporation of road bank angle to create a zero steady-state torque requirement when designing the direct tilt control and the dynamic model of the full car model. It also highlights the potential of the SKDT suspension system to improve cornering performance and paves the way for future work on the vehicle’s integrated chassis control system. Active tilting technology to improve vehicle cornering is the focus of numerous ongoing research projects, but these don’t consider the effect of road bank angle in the control system design or in the dynamic model of the tilting standard passenger vehicles. The non-incorporation of road bank angle creates a non-zero steady state torque requirement.
Development Of A Semi Active Intelligent Suspension System For Heavy Vehicles
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Author : Nima Eslaminasab
language : en
Publisher:
Release Date : 2008
Development Of A Semi Active Intelligent Suspension System For Heavy Vehicles written by Nima Eslaminasab and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
With the new advancements in the vibration control strategies and controllable actuator manufacturing, the semi-active actuators (dampers) are finding their way as an essential part of vibration isolators, particularly in vehicle suspension systems. This is attributed to the fact that in a semi-active system, the damping coefficients can be adjusted to improve ride comfort and road handling performances. The currently available semi-active damper technologies can be divided into two main groups. The first uses controllable electromagnetic valves. The second uses magnetorheological (MR) fluid to control the damping characteristics of the system. Leading automotive companies such as General Motors and Volvo have started to use semi-active actuators in the suspension systems of high-end automobiles, such as the Cadillac Seville and Corvette, to improve the handling and ride performance in the vehicle. But much more research and development is needed in design, fabrication, and control of semi-active suspension systems and many challenges must be overcome in this area. Particularly in the area of heavy vehicle systems, such as light armored vehicles, little related research has been done, and there exists no commercially available controllable damper suitable for the relatively high force and large displacement requirements of such application. As the first response to these requirements, this thesis describes the design and modeling of an in-house semi-active twin-tube shock absorber with an internal variable solenoid-actuated valve. A full-scale semi-active damper prototype is developed and the shock absorber is tested to produce the required forcing range. The test results are compared with results of the developed mathematical model. To gain a better understanding of the semi-active suspension controlled systems and evaluate the performance of those systems, using perturbation techniques this thesis provides a detailed nonlinear analysis of the semi-active systems and establishes the issue of nonlinearity in on-off semi-active controlled systems. Despite different semi-active control methods and the type of actuators used in a semi-active controlled system, one important practical aspect of all hydro-mechanical computer controlled systems is the response-time. The longest response-time is usually introduced by the actuator -in this case, controllable actuator - in the system. This study investigates the effect of response-time in a semi-active controlled suspension system using semi-active dampers. Numerical simulations and analytical techniques are deployed to investigate the issue. The performance of the system due to the response-time is then analyzed and discussed. Since the introduction of the semi-active control strategy, the challenge was to develop methods to effectively use the capabilities of semi-active devices. In this thesis, two semi-active control strategies are proposed. The first controller to be proposed is a new hybrid semi-active control strategy based on the conventional Rakheja-Sankar (R-S) semi-active control to provide better ride-handling quality for vehicle suspension systems as well as industrial vibration isolators. To demonstrate the effectiveness of this new strategy, the analytical method of averaging and the numerical analysis method are deployed. In addition, a one-degree-of-freedom test bed equipped with a semi-active magnetorheological (MR) damper is developed. The tests are performed using the MATLAB XPC-target to guarantee the real-time implementation of the control algorithm. The second controller is an intelligent fuzzy logic controller system to optimize the suspension performance. The results from this intelligent system are compared with those of several renowned suspension control methods such as Skyhook. It is shown that the proposed controller can enhance concurrently the vehicle handling and ride comfort, while consuming less energy than existing control methodologies. The key goal of this thesis is to employ the existing knowledge of the semi-active systems together with the new ideas to develop a semi-active suspension system. At the same time, development of an experimental simulation system for real-time control of an experimental test bed is considered. To achieve its goals and objectives, this research study combines and utilizes the numerical simulations and analytical methods, as well as lab-based experimental works. The challenge in this research study is to identify practical and industrial problems and develop proper solutions to those problems using viable scientific approaches.
Development Of Computerized Active Vehicle Suspensions
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Author : Herbert K. Sachs
language : en
Publisher:
Release Date : 1976
Development Of Computerized Active Vehicle Suspensions written by Herbert K. Sachs and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
An active, computerized, adaptive control system is discussed for the control of vehicle vibrations by means of adjustment of suspension parameters during the ride. The problem is subdivided into two basic parts. One, optimization of vehicle suspension parameters if forward speed, terrain statistics and vehicle descriptors are known a-priori. This information is developed off board and stored on board in the computer memory. Two, methods of evaluating terrain data received from sensors on board the vehicle and subsequently processing it for comparison with the stored data contained in the memory. Methods of signaling the selection of best parameters by means of amplifiers, solenoids and valves to the suspension system (Conceptual design). The use of fluid suspension elements is shown to permit automatic height control (static deflection control relative to payload) together with dynamic deflection control based on root mean square values of the input displacements. The theoretical problem treatment refers to linear suspension systems subject to random inputs. Included is an analog computer program and results of trial runs. (Author).
Vehicle Suspension System Technology And Design
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Author : Avesta Goodarzi
language : en
Publisher: Springer Nature
Release Date : 2023-02-13
Vehicle Suspension System Technology And Design written by Avesta Goodarzi and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-02-13 with Technology & Engineering categories.
This book describes the procedures of developing an adaptive suspension system with examples. This book gives a thorough introduction to air suspension systems, which contain height leveling systems, electronic control systems, design fundamentals, performance superiority, etc. This book encompasses all essential aspects of suspension systems and provides an easy approach to their understanding and design. Provides a step-by-step approach using pictures, graphs, tables, and examples so that the reader may easily grasp difficult concepts. This book defines and examines suspension mechanisms and their geometrical features. Suspension motions and ride models are derived for the study of vehicle ride comfort. Analysis of suspension design factors and component sizing along with air suspension systems and their functionalities are reviewed.
Semi Active Suspension Control
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Author : Emanuele Guglielmino
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-05-27
Semi Active Suspension Control written by Emanuele Guglielmino and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-05-27 with Technology & Engineering categories.
Semi-active Suspension Control provides an overview of vehicle ride control employing smart semi-active damping systems. These systems are able to tune the amount of damping in response to measured vehicle-ride and handling indicators. Two physically different dampers (magnetorheological and controlled-friction) are analysed from the perspectives of mechatronics and control. Ride comfort, road holding, road damage and human-body modelling are studied. Mathematical modelling is balanced by a large and detailed section on experimental implementation, where a variety of automotive applications are described offering a well-rounded view. The implementation of control algorithms with regard to real-life engineering constraints is emphasised. The applications described include semi-active suspensions for a saloon car, seat suspensions for vehicles not equipped with a primary suspension, and control of heavy-vehicle dynamic-tyre loads to reduce road damage and improve handling.
Development Of Hybrid Electromagnetic Dampers For Vehicle Suspension Systems
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Author : Babak Ebrahimi
language : en
Publisher:
Release Date : 2009
Development Of Hybrid Electromagnetic Dampers For Vehicle Suspension Systems written by Babak Ebrahimi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Vehicle suspension systems have been extensively explored in the past decades, contributing to ride comfort, handling and safety improvements. The new generation of powertrain and propulsion systems, as a new trend in modern vehicles, poses significant challenges to suspension system design. Consequently, novel suspension concepts are required, not only to improve the vehicle's dynamic performance, but also to enhance the fuel economy by utilizing regeneration functions. However, the development of new-generation suspension systems necessitates advanced suspension components, such as springs and dampers. This Ph. D. thesis, on the development of hybrid electromagnetic dampers is an Ontario Centres of Excellence (OCE) collaborative project sponsored by Mechworks Systems Inc. The ultimate goal of this project is to conduct feasibility study of the development of electromagnetic dampers for automotive suspension system applications. With new improvements in power electronics and magnetic materials, electromagnetic dampers are forging the way as a new technology in vibration isolation systems such as vehicle suspension systems. The use of electromagnetic dampers in active vehicle suspension systems has drawn considerable attention in the recent years, attributed to the fact that active suspension systems have superior performance in terms of ride comfort and road-handling performances compared to their passive and semi-active counterparts in automotive applications. As a response to the expanding demand for superior vehicle suspension systems, this thesis describes the design and development of a new electromagnetic damper as a customized linear permanent magnet actuator to be used in active suspension systems. The proposed electromagnetic damper has energy harvesting capability. Unlike commercial passive/semi-active dampers that convert the vibration kinetic energy into heat, the dissipated energy in electromagnetic dampers can be regenerated as useful electrical energy. Electromagnetic dampers are used in active suspension systems, where the damping coefficient is controlled rapidly and reliably through electrical manipulations. Although demonstrating superb performance, active suspensions still have some issues that must be overcome. They have high energy consumption, weight, and cost, and are not fail-safe in case of a power break-down. Since the introduction of the electromagnetic dampers, the challenge was to address these drawbacks. Hybrid electromagnetic dampers, which are proposed in this Ph. D. thesis, are potential solutions to high weight, high cost, and fail-safety issues of an active suspension system. The hybrid electromagnetic damper utilizes the high performance of an active electromagnetic damper with the reliability of passive dampers in a single package, offering a fail-safe damper while decreasing weight and cost. Two hybrid damper designs are proposed in this thesis. The first one operates based on hydraulic damping as a source of passive damping, while the second design employs the eddy current damping effect to provide the passive damping part of the system. It is demonstrated that the introduction of the passive damping can reduce power consumption and weight in an active automotive suspension system. The ultimate objective of this thesis is to employ existing suspension system and damper design knowledge together with new ideas from electromagnetic theories to develop new electromagnetic dampers. At the same time, the development of eddy current dampers, as a potential source for passive damping element in the final hybrid design, is considered and thoroughly studied.
Development Of An Experimental Active Suspension System
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Author :
language : en
Publisher:
Release Date : 1994
Development Of An Experimental Active Suspension System written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
The work summarized in this report was aimed at developing an experimental active suspension system for a quarter-ton rubber-tired vehicle, the Iltis. The work was an attempt to produce a system which has the flexibility to reproduce the action of a variety of commercial active suspension systems. In this way, their ability to control the ride quality of the Iltis could be compared objectively through full-scale testing. Aspects of the work included a review of the state of the art as found in the literature, developing a conceptual design, laboratory testing, installation on the vehicle, field tests, and computer simulation of active suspension systems.
Advanced Control For Vehicle Active Suspension Systems
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Author : Weichao Sun
language : en
Publisher: Springer
Release Date : 2019-03-13
Advanced Control For Vehicle Active Suspension Systems written by Weichao Sun and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-03-13 with Technology & Engineering categories.
This book focuses on most recent theoretical findings on control issues for active suspension systems. The authors first introduce the theoretical background of active suspension control, then present constrained H∞ control approaches of active suspension systems in the entire frequency domain, focusing on the state feedback and dynamic output feedback controller in the finite frequency domain which people are most sensitive to. The book also contains nonlinear constrained tracking control via terminal sliding-mode control and adaptive robust theory, presenting controller design of active suspensions as well as the reliability control of active suspension systems. The target audience primarily comprises research experts in control theory, but the book may also be beneficial for graduate students alike.
A Study Of Active Suspensions For Heavy Vehicles
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Author : Clément E. Berthiaume
language : en
Publisher:
Release Date : 1987
A Study Of Active Suspensions For Heavy Vehicles written by Clément E. Berthiaume and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Trucks categories.