An Investigation of Vibration Isolation Systems Using Active, Semi-active and Tunable Passive Mechanisms, with Applications to Vehicle Suspensions PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download An Investigation of Vibration Isolation Systems Using Active, Semi-active and Tunable Passive Mechanisms, with Applications to Vehicle Suspensions PDF full book. Access full book title An Investigation of Vibration Isolation Systems Using Active, Semi-active and Tunable Passive Mechanisms, with Applications to Vehicle Suspensions by Hong Su. Download full books in PDF and EPUB format.
Author: Hong Su
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Hong Su
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Fei Wang
Publisher: Springer
ISBN: 9811330565
Category : Technology & Engineering
Languages : en
Pages : 175
Get Book Here
Book Description
This book discusses efforts to control the low-frequency vibration transmission of typical power equipment and pipeline systems of ships, exploring the use of active and passive hybrid vibration isolation and adjustable dynamic vibration absorption technologies. It also proposes an adaptive feed-forward control strategy and studies a distributed feed-forward control hardware system. In addition, the book presents a three-way dynamic vibration absorption theory used to design a pipeline-system adjustable dynamic vibration absorber, which offers a number of advantages, such as compact structure, easy assembly and disassembly, low power consumption, excellent vibration control effect and wide frequency band adjustable ability, etc. This book is a valuable resource for researchers and engineers in the fields of noise and vibration control, active control systems, active vibration isolation and adaptive dynamic vibration absorption.
Author: Tomasz Krzyzynski
Publisher: Springer
ISBN: 3030030474
Category : Technology & Engineering
Languages : en
Pages : 184
Get Book Here
Book Description
This book describes the modelling and optimisation of vibration reduction systems in an integrated fashion using nonlinear equations of motion. It proposes an effective optimisation method for determining the basic characteristics of the non-linear visco-elastic elements used in passive vibration reduction systems. In the case of semi-active and active vibration isolators, a design process of the advanced control systems is proposed that makes possible to optimise the controller settings relatively to the selected vibro-isolation criteria. The approach developed here is subsequently tested by means of experimental investigations conducted on various sample vibration reduction systems: passive, semi-active and active. The book presents a biomechanical modelling approach that allows users to select the properties of vibro-isolation systems for different types of oscillation and different optimisation criteria – and can significantly reduce the harmful vibrations that can affect the human body in the process. Further, the book equips readers to evaluate the viscoelastic characteristics of passive systems and design control systems for semi-active and active systems. Modelling and Control Design of Vibration Reduction Systems offers a valuable guide for researchers and practitioners alike. It also provides students and academics with systematic information on the procedures to be followed in the design process for semi-active or active vibration reduction systems.
Author: Fabio Casciati
Publisher: John Wiley & Sons
ISBN: 0470022906
Category : Science
Languages : en
Pages : 268
Get Book Here
Book Description
Researchers have studied many methods of using active and passive control devices for absorbing vibratory energy. Active devices, while providing significant reductions in structural motion, typically require large (and often multiply-redundant) power sources, and thereby raise concerns about stability. Passive devices are fixed and cannot be modified based on information of excitation or structural response. Semiactive devices on the other hand can provide significant vibration reductions comparable to those of active devices but with substantially reduced power requirements and in a stable manner. Technology of Semiactive Devices and Applications in Vibration Mitigation presents the most up-to-date research into semiactive control systems and illustrates case studies showing their implementation and effectiveness in mitigating vibration. The material is presented in a way that people not familiar with control or structural dynamics can easily understand. Connecting structural dynamics with control, this book: Provides a history of semiactive control and a bibliographic review of the most common semiactive control strategies. Presents state-of-the-art semiactive control systems and illustrates several case studies showing their implementation and effectiveness to mitigate vibration. Illustrates applications related to noise attenuation, wind vibration damping and earthquake effects mitigation amongst others. Offers a detailed comparison between collocated and non-collocated systems. Formulates the design concepts and control algorithms in simple and readable language. Includes an appendix that contains critical considerations about semiactive devices and methods of evaluation of the original damping of a structure. Technology of Semiactive Devices and Applications in Vibration Mitigation is a must-have resource for researchers, practitioners and design engineers working in civil, automotive and mechanical engineering. In addition it is undoubtedly the key reference for all postgraduate students studying in the field.
Author:
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 232
Get Book Here
Book Description
Author: Ehsan Asadi
Publisher:
ISBN:
Category : Electromagnetic waves
Languages : en
Pages : 126
Get Book Here
Book Description
Traditionally, dynamic systems are equipped with passive technologies like viscous shock absorbers and rubber vibration isolators to attenuate disturbances. Passive elements are cost effective, simple to manufacture, and have a long life span. However, the dynamic characteristics of passive devices are fixed and tuned for a set of inputs or system conditions. Thus in many applications when variation of input or system conditions is present, sub-optimal performance is realized. The other fundamental flaw associated with passive devices is that they expel the undesired kinetic energy as heat. Recently, the introduction of electromagnetic technologies to the vibration isolation systems has provided researchers with new opportunities for realizing active/semi-active vibration isolation systems with the additional benefit of energy regeneration (in semi-active mode). Electromagnetic vibration isolators are often suffer from a couple of shortcomings that precludes their implementations in many applications. Examples of these short comings include bulky designs, low force density, high energy consumption (in active mode), and fail-safe operation problem. This PhD research aims at developing optimal hybrid-electromagnetic vibration isolation systems to provide active/semi-active and regenerative vibration isolation for various applications. The idea is to overcome the aforementioned shortcomings by integrating electromagnetic actuators, conventional damping technologies, and stiffness elements into single hybrid packages. In this research, for both semi-active and active cases, hybrid electromagnetic solutions are proposed. In the first step of this study, the concept of semi-active hybrid damper is proposed and experimentally tested that is composed of a passive hydraulic and a semi-active electromagnetic components. The hydraulic medium provides a bias and fail-safe damping force while the electromagnetic component adds adaptability and energy regeneration to the hybrid design. Based on the modeling and optimization studies, presented in this work, an extended analysis of the electromagnetic damping component of the hybrid damper is presented which can serve as potent tool for the designers who seek maximizing the adaptability (and regeneration capacity) of the hybrid damper. The experimental results (from the optimized design) show that the damper is able to produce damping coefficients of 1300 and 0-238 Ns/m through the viscous and electromagnetic components, respectively. In particular, the concept of hybrid damping for the application of vehicle suspension system is studied. It is shown that the whole suspension system can be adjusted such that the implementation of the hybrid damper, not only would not add any adverse effects to the main functionally of the suspension, but it would also provide a better dynamics, and enhance the vehicle fuel consumption (by regenerating a portion of wasted vibration energy). In the second step, the hybrid damper concept is extended to an active hybrid electromagnetic vibration isolation systems. To achieve this target, a passive pneumatic spring is fused together with an active electromagnetic actuator in a single hybrid package. The active electromagnetic component maintains a base line stiffness and support for the system, and also provides active vibration for a wide frequency range. The passive pneumatic spring makes the system fail-safe, increases the stiffness and support of the system for larger masses and dead loads, and further guarantees a very low transmissibility at high frequencies. The FEM and experimental results confirmed the high force density of the proposed electromagnetic component, comparing to a voice coil of similar size. In the proposed design, with a diameter of ~125 mm and a height of ~60 mm, a force variation of ~318 N is obtained for the currents of I=ł2 A. Furthermore, it is demonstrated that the proposed actuator has a small time constant (ratio of inductance to resistance for the coils) of less than 5.2 ms, with negligible eddy current effect, making the vibration isolator suitable for wide bandwidth applications. According to the results, the active controllers are able to enhance the performance of the passive elements by up to 80% and 95% in terms of acceleration and force transmissibilities, respectively.
Author: Wei Huang
Publisher: Springer Nature
ISBN: 9819922135
Category : Technology & Engineering
Languages : en
Pages : 361
Get Book Here
Book Description
This book presents the research results of advanced vibration control technology, based on two types of typical equipment in industrial engineering of China: power equipment and vibration-sensitive equipment. The main contents of this book include optimized active control strategy research, semi-active control research that can track and equivalently achieve active control effects, refined analysis of active control based on finite element method, research on the impact of vibration isolator layout on vibration isolation performance, passive and active control research based on system freedom decoupling and load decoupling, realized passive and active control research using quasi-zero stiffness system based on positive and negative stiffness, intelligent sensors optimization deployment of plane and space structure, and related key technology application cases in engineering applications. This book provides useful references for engineers and researchers in industrial engineering and technical support for practitioners in the development of China's high-end industry.
Author: Sampath Rengarajan
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Gregory J. Stelzer
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
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: Haiping Du
Publisher: CRC Press
ISBN: 1000999297
Category : Technology & Engineering
Languages : en
Pages : 323
Get Book Here
Book Description
This book covers complex issues for a vehicle suspension model, including non-linearities and uncertainties in a suspension model, network-induced time delays, and sampled-data model from a theoretical point of view. It includes control design methods such as neural network supervisory, sliding mode variable structure, optimal control, internal-model principle, feedback linearization control, input-to-state stabilization, and so on. Every control method is applied to the simulation for comparison and verification. Features: Includes theoretical derivation, proof, and simulation verification combined with suspension models Provides the vibration control strategies for sampled-data suspension models Focuses on the suspensions with time-delays instead of delay-free Covers all the models related to quarter-, half-, and full-vehicle suspensions Details rigorous mathematical derivation process for each theorem supported by MATLAB®-based simulation This book is aimed at researchers and graduate students in automotive engineering, vehicle vibration, mechatronics, control systems, applied mechanics, and vehicle dynamics.
