Download or read book A Novel Semi active Magnetorheological Mount for Vibration Isolation written by The Minh Nguyen and published by . This book was released on 2009 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, the higher price of fossil fuels and green house effects has been the motivating factors for the automotive industry to introduce more efficient vehicles. Today evolution in automobiles is mostly to reduce fuel consumption and emissions. Variable cylinder management has been employed in V6 & V8 engines to allow the vehicles to operate with only 3 or 4 active cylinders. Hybrid technologies including hybrid electric and emerging hydraulic hybrid equip the vehicles with additional power sources which work at higher efficiency than that of internal combustion engines. The proven advantages of the hybrid vehicles or variable cylinder management also come with challenging problem of noise, vibration and harshness (NVH). This issue has to be properly addressed in order for the technologies to find consumer acceptance. The NVH in modern vehicles is mainly due to the involvement of multiple power sources working in different modes and the switching among them. This feature can lead to shock and vibration over a wide range of frequencies. It has been proven that passive vibration isolators, e.g. elastomeric and hydraulic, are not sufficient to deal with this problem. Active mounts are effective, but they are expensive and can lead to stability problems. Research has shown that semi-active vibration isolators are as effective as active mounts while being significantly less expensive. In this study, a novel shock and vibration isolator in the form of a magnetorheological (MR) mount is introduced. MR fluids are smart fluids which respond to magnetic fields. Using these fluids it is possible to transform a passive hydraulic vibration isolator to a semi-active device one. The semi-active MR mount presented in this dissertation is unique because it utilizes the MR fluid in two configurations flow (or valve) and squeeze modes to mitigate shock and vibration over a wide range of frequencies. The new mount was designed following a thorough literature review of the semi-active and MR vibration isolation. A mathematical model of the mount was developed to represent the vibration isolation behavior of the system. The analytical model was numerically solved and simulated in MATLAB®. Simulation results were used to predict the performance of the mount and to evaluate the effect of design parameters on the mount behavior. A prototype MR mount was built based on the analytical model. The mount was experimentally evaluated. The experimental data was used to verify the model in predicting the mount characteristics. This study provided a fundamental understanding on the behavior of MR fluid in vibration isolation devices. The mount demonstrates effectiveness of the flow and squeeze modes when they are activated individually and in combination. The results of this research can lead to developing effective isolation devices for many different applications including hybrid and alternative fuel vehicles.

Download or read book Combined Shock and Vibration Isolation Through the Self powered Semi active Control of a Magnetorheological Damper in Parallel with an Air Spring written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Combining shock and vibration isolation into a single isolation system package is explored through the use of an air spring in parallel with a controlled magnetorheological fluid damper. The benefits of combining shock and vibration isolation into a single package is discussed. Modeling and control issues are investigated and test and simulation results are discussed. It is shown that this hybrid isolation system provides significantly increased performance over current state-of-the-art passive systems. Also explored is the feasibility of scavenging and storing ambient shipboard vibration energy for use in powering the isolation system. To date the literature has not adequately explored the direct design of a combined shock and vibration isolation system. As shock and vibration isolation are typically conflicting goals, the traditional approach has been to design separate shock and vibration isolation systems and operate them in parallel. This approach invariably leads to compromises in terms of the performance of both systems. Additionally, while considerable research has been performed on magnetorheological fluids and devices based on these fluids, there has been little research performed on the use of these fluids in devices that are subjected to high velocities such as the velocity seen by a ship exposed to underwater near-miss explosive events. Also missing from the literature is any research involving the scavenging and storage of ambient shipboard vibration energy. While the focus of this work is on the use of this scavenged energy to power the subject isolation system, many other uses for this energy can be envisioned. Experimental and analytical results from this research clearly show the advantages of this hybrid isolation system. Drop tests show that inputs as great as 167 g's were reduced to 3.42 g's above mount at 1.11 inches of deflection using a Velocity Feedback controller suggested by the author. When contrasted with typical test results with similar inputs, the subject isolation system achieved reductions in above mount accelerations of 300% and reductions in mount deflections of 200% over current state-of-the-art passive shipboard isolation systems.

Download or read book Insight into Magnetorheological Shock Absorbers written by Janusz Gołdasz and published by Springer. This book was released on 2014-12-27 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with magnetorheological fluid theory, modeling and applications of automotive magnetorheological dampers. On the theoretical side a review of MR fluid compositions and key factors affecting the characteristics of these fluids is followed by a description of existing applications in the area of vibration isolation and flow-mode shock absorbers in particular. As a majority of existing magnetorheological devices operates in a so-called flow mode a critical review is carried out in that regard. Specifically, the authors highlight common configurations of flow-mode magnetorheological shock absorbers, or so-called MR dampers that have been considered by the automotive industry for controlled chassis applications. The authors focus on single-tube dampers utilizing a piston assembly with one coil or multiple coils and at least one annular flow channel in the piston.

Download or read book Advances in Applied Nonlinear Dynamics Vibration and Control 2021 written by Xingjian Jing and published by Springer Nature. This book was released on 2021-09-23 with total page 1210 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is to provide readers with up-to-date advances in applied and interdisciplinary engineering science and technologies related to nonlinear dynamics, vibration, control, robotics, and their engineering applications, developed in the most recent years. All the contributed chapters come from active scholars in the area, which cover advanced theory & methods, innovative technologies, benchmark experimental validations and engineering practices. Readers would benefit from this state-of-the-art collection of applied nonlinear dynamics, in-depth vibration engineering theory, cutting-edge control methods and technologies, and definitely find stimulating ideas for their on-going R&D work. This book is intended for graduate students, research staff and scholars in academics, and also provides useful hand-up guidance for professional and engineers in practical engineering missions.

Download or read book Controllable Electrorheological and Magnetorheological Materials written by Seung-Bok Choi and published by Frontiers Media SA. This book was released on 2019-10-09 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Control of a Uni Axial Magnetorheological Vibration Isolator written by Shuo Wang and published by LAP Lambert Academic Publishing. This book was released on 2011-09 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The technologies of hybridization of vehicles have been proven to significantly improve the fuel economy and reduce the environmental pollution. These technologies combine additional power sources with a traditional internal combustion engine. In some other modern vehicles, advanced cylinder management is the means to reduce fuel consumption and emissions. While these advanced technologies aim at energy savings and preserving the environment they create additional noise, vibration and harshness (NVH) problem. Semi-active vibration isolation devices are preferred to address the problem due to their effectiveness and affordability. A magnetorheological (MR) fluid mount can provide effective vibration isolation for applications such as hybrid vehicles. The focus of the current study is on the design of a control system for the mixed mode MR fluid mount. Based on a model for the uni-axial MR mount a controller has been designed to achieve the lowest possible vibration transmissibility. The results of this research can shed some light on developing the control system for other effective isolation devices.

Download or read book Magnetorheological Fluid Foam Vibration Isolation System for Nanosats written by Israel López Martínez and published by . This book was released on 2004 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electro rheological Fluids and Magneto rheological Suspensions written by Rongjia Tao and published by World Scientific. This book was released on 2011 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique volume presents the scientific progress, state-of-art technology, and thrust areas to be focused in electrorheology (ER) and magentorheology (MR). In the last couple of years, this area produced significant impacts on automobile industry, bridge and building construction, aerospace industry, and defense industry. Recent innovation in this area lead to new technology, which has great impact on energy production and energy conservation. This book includes all papers presented at the 12th International Conference on ER Fluids and MR Suspensions, held in Philadelphia, USA, August 16 to 20, 2010, providing a comprehensive overview of this flourishing area. It is an essential source of reference for chemists, engineers, physicists, and materials scientists. It is also suitable for science and engineering students.

Download or read book Proceedings of the ASME Conference on Smart Materials Adaptive Structures and Intelligent Systems written by and published by . This book was released on 2009 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study on Vibration Isolation Performance and Control Method of Magneto rheological Mounts written by Qing Yang and published by . This book was released on 2014 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electro rheological Fluids And Magneto rheological Suspensions Proceedings Of The 12th International Conference written by Rongjia Tao and published by World Scientific. This book was released on 2011-05-26 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique volume presents the scientific progress, state-of-art technology, and thrust areas to be focused in electrorheology (ER) and magentorheology (MR). In the last couple of years, this area produced significant impacts on automobile industry, bridge and building construction, aerospace industry, and defense industry. Recent innovation in this area lead to new technology, which has great impact on energy production and energy conservation. This book includes all papers presented at the 12th International Conference on ER Fluids and MR Suspensions, held in Philadelphia, USA, August 16 to 20, 2010, providing a comprehensive overview of this flourishing area. It is an essential source of reference for chemists, engineers, physicists, and materials scientists. It is also suitable for science and engineering students.

Download or read book Nonlinear Dynamics Volume 1 written by Gaetan Kerschen and published by Springer. This book was released on 2016-04-22 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear Dynamics, Volume 1. Proceedings of the 34th IMAC, A Conference and Exposition on Dynamics of Multiphysical Systems: From Active Materials to Vibroacoustics, 2016, the fi rst volume of ten from the Conference, brings together contributions to this important area of research and engineering. Th e collection presents early fi ndings and case studies on fundamental and applied aspects of Structural Dynamics, including papers on: • Nonlinear Oscillations • Nonlinear Modal Analysis • Nonlinear System Identifi cation • Nonlinear Modeling & Simulation • Nonlinearity in Practice • Nonlinearity in Multi-Physics Systems • Nonlinear Modes and Modal Interactions

Download or read book A Novel Magnetorheological Fluid elastomer Vibration Isolator written by David J. York and published by . This book was released on 2007 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Semi active Isolation of a Single Degree of freedom System Using a Magneto rheological Damper written by P. Jean and published by . This book was released on 2005 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Tenth International Symposium on Applied Electromagnetic and Mechanics written by T. Takagi and published by IOS Press. This book was released on 2003 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication covers topics in the area of applied electromagnetics and mechanics. Since starting in Japan in 1988, the ISEM has become a well-known international forum on applied electromagnetics.

Download or read book Dynamics of Civil Structures Volume 2 written by Hae Young Noh and published by Springer Nature. This book was released on 2023-11-06 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamics of Civil Structures, Volume 2: Proceedings of the 41st IMAC, A Conference and Exposition on Structural Dynamics, 2023, the second volume of ten from the Conference brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of the Dynamics of Civil Structures, including papers on: Structural Vibrations Structural Health Monitoring Human-Structure Interaction Vibration Control and Mitigation Innovative Sensing for Structural Applications Smart Structures and Automation Modal Identification of Structural Systems Dynamics of Buildings, Bridges, and Off-Shore Platforms

Download or read book Active Hard Mount Vibration Isolation for Precision Equipment written by Dirk Tjepkema and published by . This book was released on 2012 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: