2 edition of Dynamic models of elastomers and their application to vibration and shock control in vehicles found in the catalog.
Dynamic models of elastomers and their application to vibration and shock control in vehicles
Thesis (M.Phil)-University of Birmingham, School of Manufacturing and Mechanical Engineering, 1991.
|Statement||by Ding-Zhao Luo.|
A detailed and extensive description regarding the theory of passive dynamic absorbers not requiring additional energy sources. Considers the peculiarities in solving vibration absorption problems using the simplest double-mass linear model of the protected structure and absorber. A magnetorheological (MR) elastomer, which belongs to the MR material family, is a composite material with magnetic-sensitive particles suspended or arranged within a non-magnetic elastomer matrix .In the presence of a magnetic field, the particles exhibit an MR effect, providing a field-dependent material property to the material, e.g. a controllable modulus and damping.
The damping force of elastomer buffer in shock environment is the research object of this paper. The impact experiment and data simulation are used to understand the whole mechanical system. Equation with velocity and damping force is used for modeling according to the specific type of the elastomer buffer. The data of velocity and damping force is obtained by experimental data collection and. 45th International JVE Conference is an integral part of Vibroengineering Series Conferences and will be held in Dublin, Conference is organized by JVE International and University College Dublin.. Conference is dedicated to researchers, scientists, engineers and practitioners throughout the world to present their latest research results, foster discussion, new ideas, develop.
A method of vibration reduction based on activation of an MRE block that couples twin cantilever beams at their free ends is investigated. Four types of magnetorheological elastomers have been manufactured, and their rheological properties in a range of magnetic field intensities are established. Free vibrations of several double-beam structures with controllable damping members made of these. This review of MRF (magnetorheological fluids or MR fluids) brings out the challenges in methods of preparation, difficulties encountered in storage and use, and possible solutions to overcome the challenges. Magnetorheological fluid in the rheological fluid domain has found use due to its ability to change its shear strength based on the applied magnetic field.
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Application of a dynamic antiresonant vibration isolator to minimize the vibration transmission in underwater vehicles Article (PDF Available) in Journal of Vibration and Control June with.
In the vibration control area, a simple rheological model used to study the non-linear behaviour of an isolator is presented in  where the jump phenomenon in the transmissivity coefﬁcient of an. In scientific literature, materials with long molecular chains are often referred to as elastomeric polymers.
Due to their elevated deformability, damping capacity and wide range of obtainable mechanical properties, they have numerous applications in vibration control. Typically, elastomers show a non-linear elastic and dissipative by: Contributed by the Dynamic Systems and Control Division for“The Use of Bonded Elastomers for Energy and Motion Control in Construction,” Rubber Word, Apr., pp.
38– T., Takano, K. and Nojuchi, T.,“Rheological Characteristics of ER Fluids and Their Application to Anti-Vibration Devices with Control Mechanism for Cited by: Dynamic substructuring is often employed to reduce the size of numerical models for structural dynamic analysis. In this paper, we discuss how elastomeric vibration isolators can be modelled within the framework of dynamic substructuring in order to obtain accurate and efficient reduced order by: 4.
THE DYNAMIC TESTING OF ELASTOMERS by R. Frampton (Technical Director Davenport-Nene Testing Systems) 1 Introduction Elastomers are finding wider and wider applications throughout industry. For example, the automotive industry is continually attempting to improve fuel efficiency.
The resulting reduction. The Dynamic Vibration Absorber This page demonstrates the behavior of the classical undamped dynamic absorber, introduced into the literature in by J.
Ormondroyd and J.P. Den Hartog. The results below were calculated using the mathematical derivation on pages of Den Hartog's book Mechanical Vibrations, 4th Edition, (Dover, ).
problem in the field of vibration and shock isolation and many of the products shown in this catalog may be used for applications other than the protection of electronic equipment. This catalog is intended to provide you with a basic background on vibration control theory and specific vibration and shock control solutions.
This catalog features. This paper presents a reduced, yet accurate, dynamic model for ICD-DEG that features one kinematic degree of freedom and which accounts for DE visco-elasticity. The model is computationally simple and can be easily integrated into existing wave-to-wire models of OWCs to be used for fast analysis and real-time applications.
In the study, a flexible carbody model with a magnetorheological elastomer dynamic vibration absorber is established. A design method of a semiactive dynamic vibration absorber that is based on magnetorheological elastomer is introduced, and the operational principle of the semiactive dynamic vibration absorber is also discussed.
elastomers and their applications. The aim is to bring together in one place for example dynamic seals to follow variations in the sealing surface. Figure 6: Elastomer sample undergoing shock absorbing, vibration damping, and electrical and thermal insulation.
In the application for vibration control, stack-type and tubular-type DE structures usually used as actuators are surveyed. The established control algorithms for the controlled systems using DE actuators are described.
The challenges for the research into the dynamics of DE structure and its application for vibration control and some. This paper presents results of simulation of visco-elastic dampers based on the model of the vehicle shock absorber. The aim of this research is to determine the parameters of dynamic models of special dampers applicable in advanced vehicle suspension systems.
One of the key issues of modeling is to determine the acceptable degree of the simplification. Low-profile, high deflection mounts are general purpose isolators for applications in ground vehicles or transit cases where high amplitude vibration and shock loading is expected.
They are resistant to a wide range of environmental conditions and are ideally suited for the isolation of electronic equipment in off-road and heavy duty service.
Selection of the correct elastomeric rubber material for your application, be it fluid or environmental sealing, vibration isolation or dampening, impact bumpers, hoses and fluid movement and various other requires the review of numerous factors such as: dynamic or static application, system pressure, chemical compatibility; heat, cold and.
The rheological properties of magnetorheological (MR) materials, such as their viscosity and dynamic modulus, can be tuned or controlled by changing the intensity of the magnetic field using appropriate control schemes. Thanks to their robustness, performance and smart properties, numerous studies have been undertaken on the development of new MR materials, and microscopic and macroscopic.
Polymer Technologies offers a diverse range of elastomeric solutions and specializes in rubber mounts for vibration and shock products are manufactured by our Elastomeric Solutions Division, also known as meet your vibration control requirements, we have a variety of stock products or custom designs available.
This paper presents a concept of dynamic vibration absorber (DVA) applied magnetorheological elastomers (MREs) for vibration reduction. Elastic modulus of MRE significantly increases due to the induced magnetic field.
Elastic modulus changes the stiffness of DVA. Thus, the DVA can work effectively in a wide frequency range instead of a narrow bandwidth as a conventional dynamic vibration. in Dynamic Stiffness or a change in force, or both.
A sudden reduction in vibration could signify an increased stiffness, such as pipe strain or a cocked bearing or a frozen coupling. All of these are undesirable. To the individual looking only at a reduction in vibration as. In this research, a novel variable stiffness vibration isolator that uses magnetorheological elastomers (MREs) accompanied with a fuzzy semiactive vibration control was developed.
Firstly, the viscoelastic characteristics of MREs in shear mode were clarified systematically in order to achieve a mathematical basis for the controller development. If you have concerns about your application environment and the use of elastomer isolators, please contact Vibro/Dynamics for assistance from one of our engineers.
Transport The line of transport elastomer isolators are designed to reduce shock and vibration commonly encountered in transport applications.Their outstanding characteristics give MSEs attractive developmental potential and broad application prospect in many fields, such as intelligent actuation and sensing, active shock absorption and noise reduction, bionic structures, and other modern technology.
2,4–7 2. Y.Measurement of Dynamic Elastomer Properties in a Torsional Vibration Damper A method has been developed for determining the damping and stiffness of an elastomeric engine crankshaft vibration damper by using the frequencies where the peak ring acceleration and amplitude occur.