A Magnetorheologic Semi-active Isolator to Reduce Noise and Vibration Transmissibility in Automobiles PDF Download
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Author: Gregory J. Stelzer
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The automotive industry is increasingly competitive, and manufacturers are seeking even small advantages for their product through innovative designs, lower cost parts, and more efficient manufacturing. Low cost is important, and initiatives by the automobile manufacturer to reduce cost cascade down to the different tiers of suppliers. In this process, durability of components is often considered before noise and vibration harshness, especially on low-end vehicles. Also, noise control expectations from the end user are recently becoming more demanding. Automotive manufacturers have responded by placing further expectations on the suppliers, and stringent noise control specifications are now standard on many of the smallest components in the vehicle. The demand for cost reduction, noise reduction, and increased operator comfort together requires that new approaches be developed for noise and vibration isolation in automobiles. The objective of this thesis is to develop a new isolator design for automotive components that can provide substantial and cost-effective improvements in noise and vibration harshness performance. To achieve this goal, passive, semi-active, and active isolator designs and different types of smart materials were investigated. Based on this study, the most promising approach turned out to be a semi-active magnetorheologic isolator. This type of isolator was modeled and optimized to reduce noise transmission while maintaining durability performance for an automotive component. The new results that this study produced are: (i) a detailed nonlinear model of a magnetorheologic isolator and semi-active control system, (ii) detailed simulation studies showing the trade-offs between passive and semi-active isolator performance for automotive components, and (iii) a new isolator design that provides durability and isolation performance that cannot be achieved using a passive isolator alone. The isolator design is based on a compressor component mounted to the frame of an automobile, but the isolation technique also has other applications. These include engine mounts, suspensions, and pumps in automobiles, and applications where the isolator must be durable to withstand low frequency vibration and shock loading, and at the same time prevent transmissibility of high frequency vibration from the component to the mounting structure that causes noise inside the automobile.
Author: Gregory J. Stelzer
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The automotive industry is increasingly competitive, and manufacturers are seeking even small advantages for their product through innovative designs, lower cost parts, and more efficient manufacturing. Low cost is important, and initiatives by the automobile manufacturer to reduce cost cascade down to the different tiers of suppliers. In this process, durability of components is often considered before noise and vibration harshness, especially on low-end vehicles. Also, noise control expectations from the end user are recently becoming more demanding. Automotive manufacturers have responded by placing further expectations on the suppliers, and stringent noise control specifications are now standard on many of the smallest components in the vehicle. The demand for cost reduction, noise reduction, and increased operator comfort together requires that new approaches be developed for noise and vibration isolation in automobiles. The objective of this thesis is to develop a new isolator design for automotive components that can provide substantial and cost-effective improvements in noise and vibration harshness performance. To achieve this goal, passive, semi-active, and active isolator designs and different types of smart materials were investigated. Based on this study, the most promising approach turned out to be a semi-active magnetorheologic isolator. This type of isolator was modeled and optimized to reduce noise transmission while maintaining durability performance for an automotive component. The new results that this study produced are: (i) a detailed nonlinear model of a magnetorheologic isolator and semi-active control system, (ii) detailed simulation studies showing the trade-offs between passive and semi-active isolator performance for automotive components, and (iii) a new isolator design that provides durability and isolation performance that cannot be achieved using a passive isolator alone. The isolator design is based on a compressor component mounted to the frame of an automobile, but the isolation technique also has other applications. These include engine mounts, suspensions, and pumps in automobiles, and applications where the isolator must be durable to withstand low frequency vibration and shock loading, and at the same time prevent transmissibility of high frequency vibration from the component to the mounting structure that causes noise inside the automobile.
Author: G. J. Stelzer
Publisher:
ISBN:
Category :
Languages : en
Pages : 23
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Book Description
Author: Faramarz Gordaninejad
Publisher: World Scientific
ISBN: 9814474290
Category : Technology & Engineering
Languages : en
Pages : 843
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Book Description
ERMR 2006 included invited speakers, technical presentations, poster presentations, and a student paper competition. At the conference banquet, Dr. David Carlson of Lord Corporation addressed the conference attendees and gave a stirring speech on the history of ER and MR fluids, as well as current and future applications. A unique feature of the ERMR Conferences is that they comprehensively cover issues ranging from physics to chemistry to engineering applications of ER and MR materials held in a general session to enhance the interaction between the scientists and engineers. The sessions in ERMR 2006 were organized based into two Symposia: a) Materials and b) Applications. Topics covered in the Materials Symposium included: mechanisms, preparation, and characterization of ER and MR materials. Topics covered in the Applications Symposium included: ER and MR devices, control systems, system integration, and applications. This structure was implemented in order to enable interaction between attending scientists and engineers in both the Materials Symposium and the Applications Symposium, and to enhance the free flow of ideas, and the potential collaborative research opportunities.
Author: Faramarz Gordaninejad
Publisher: World Scientific
ISBN: 9812771190
Category : Technology & Engineering
Languages : en
Pages : 843
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Book Description
ERMR 2006 included invited speakers, technical presentations, poster presentations, and a student paper competition. At the conference banquet, Dr. David Carlson of Lord Corporation addressed the conference attendees and gave a stirring speech on the history of ER and MR fluids, as well as current and future applications. A unique feature of the ERMR Conferences is that they comprehensively cover issues ranging from physics to chemistry to engineering applications of ER and MR materials held in a general session to enhance the interaction between the scientists and engineers. The sessions in ERMR 2006 were organized based into two Symposia: a) Materials and b) Applications. Topics covered in the Materials Symposium included: mechanisms, preparation, and characterization of ER and MR materials. Topics covered in the Applications Symposium included: ER and MR devices, control systems, system integration, and applications. This structure was implemented in order to enable interaction between attending scientists and engineers in both the Materials Symposium and the Applications Symposium, and to enhance the free flow of ideas, and the potential collaborative research opportunities.
Author: The Minh Nguyen
Publisher:
ISBN:
Category : Electrorheological fluids
Languages : en
Pages : 258
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Book Description
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.
Author: Inderjit Chopra
Publisher: Cambridge University Press
ISBN: 052186657X
Category : Science
Languages : en
Pages : 925
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Book Description
This book focuses on smart materials and structures, which are also referred to as intelligent, adaptive, active, sensory, and metamorphic. The ultimate goal is to develop biologically inspired multifunctional materials with the capability to adapt their structural characteristics, monitor their health condition, perform self-diagnosis and self-repair, morph their shape, and undergo significant controlled motion.
Author: Shuo Wang
Publisher: LAP Lambert Academic Publishing
ISBN: 9783846505403
Category :
Languages : en
Pages : 164
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Book Description
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.
Author: Mohd Fadzli Bin Abdollah
Publisher: Centre for Advanced Research on Energy
ISBN: 9670257700
Category :
Languages : en
Pages : 229
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Book Description
This e-book is a compilation of papers presented at the Mechanical Engineering Research Day 2016 (MERD'16) - Melaka, Malaysia on 31 March 2016.
Author: Mehdi Ahmadian
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 812
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Book Description
Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
Author:
Publisher: American Society of Mechanical Engineers
ISBN:
Category : Computers
Languages : en
Pages : 736
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Book Description
