scholarly journals Simulation calculation and research of double layer metal rubber vibration isolator

2019 ◽  
Keyword(s):  
Double Layer ◽  
Vibration Isolator ◽  
Simulation Calculation ◽  
Metal Rubber

scholarly journals Accelerated lifetime test of vibration isolator made of Metal Rubber material

2017 ◽  
Vol 167 ◽  
pp. 012051
Author(s):  
Hongrui Ao ◽  
Yong Ma ◽  
Xianbiao Wang ◽  
Jianye Chen ◽  
Hongyuan Jiang
Keyword(s):  
Vibration Isolator ◽  
Rubber Material ◽  
Lifetime Test ◽  
Metal Rubber ◽  
Accelerated Lifetime

Anti-Shock Optimization of a Certain Gas Turbine Foundation by DDAM

2010 ◽  
Vol 129-131 ◽  
pp. 376-380
Author(s):  
Zui Wei Xie ◽  
Shao Hua He ◽  
Xin Yue Wu
Keyword(s):  
Gas Turbine ◽  
Degrees Of Freedom ◽  
Design Guidelines ◽  
Response Analysis ◽  
Vibration Isolator ◽  
Analysis Method ◽  
Metal Rubber ◽  
Input Spectrum ◽  
Shock Environment ◽  
The U.S

The Dynamic Design Analysis Method (DDAM) calculation principles and procedures are addressed for a system with two degrees of freedom (DOF). The basis of the U.S. Navy DDAM design input spectrum is introduced. Shock response analysis by DDAM for a certain gas turbine foundation is conducted, followed by the displacement and stress response of key parts, such as the flexible supporter. Furthermore, weak positions of the foundation in shock environment are found. The shock isolation ability of metal-rubber originally used as the vibration isolator is also verified by comparison. Finally, design guidelines for the anti-shock optimization of the foundation are given.

Study on the Application of Metal Rubber Isolator in Compressor Base

2010 ◽  
Vol 139-141 ◽  
pp. 2478-2481
Author(s):  
Hai Long Fu ◽  
Long Qing Zou ◽  
Guang Dai ◽  
Xu Chi
Keyword(s):  
Petrochemical Industry ◽  
Maximum Stress ◽  
Mechanical Equipment ◽  
Nonlinear Simulation ◽  
Isolation System ◽  
Finite Element Software ◽  
Wide Range ◽  
Simulation Calculation ◽  
Metal Rubber ◽  
Rubber Isolator

In this paper, the main problem is how to eliminate vibration came from the compressor base in petrochemical industry. The absolute transmissibility was calculated by building the compressor isolation system model. The spectrum information of compressor vibration was got through the vibration test, and the results can be acted as the condition for the isolator’s design. Isolators were designed with damping part connecting metal rubber with helical spring. Nonlinear simulation calculation was completed by finite element software. The results show that the maximum stress of isolator is about 494MPa and its maximum distortion is approximately 6mm. It verifies that the new-style isolator can satisfy vibration elimination of compressor. It is with wide-range rigidity and better capability of energy dissipation than that of general rubber isolator. It has a useful application and perspective on vibration elimination for the mechanical equipment in petrochemical industry.

Experimental Study on Fatigue of Metal Rubber Vibration Isolator under Pulsating Cyclic Stress

2013 ◽  
Vol 385-386 ◽  
pp. 180-183 ◽  
Author(s):  
Hui Yan ◽  
Wen Jing Zhang ◽  
Hong Yuan Jiang ◽  
Liang Chen
Keyword(s):  
Resonant Frequency ◽  
Cyclic Stress ◽  
Vibration Isolator ◽  
Application Research ◽  
Vibration Isolators ◽  
Metal Rubber ◽  
New Type ◽  
Aging Phenomenon ◽  
The Military ◽  
Rubber Isolator

Metal Rubber(MR) vibration isolator is a new type of isolator developed to overcome the fatal aging phenomenon of current rubber isolator. It has broad practical application in the military, such as aerospace. In this paper, the fatigue life experiment is conducted to MR vibration isolator, and resonant frequency and resonant accelerate transmissibility are chose as degradation parameters. It’s found that MR vibration isolator possesses jump phenomenon; resonant frequency and resonant transmissibility increase quickly to the maximum, then attenuate slowly with the increasing number of vibration. This provides fundamental basis for the design and application research of MR vibration isolators.

Analysis on Fatigue Damage of Metal Rubber Vibration Isolator

2012 ◽  
Vol 490-495 ◽  
pp. 162-165 ◽  
Author(s):  
Feng Li Cao ◽  
Hong Bai Bai ◽  
Jian Chun Yang ◽  
Guo Quan Ren
Keyword(s):  
Fatigue Damage ◽  
Fatigue Failure ◽  
Solid Material ◽  
Point Of View ◽  
Vibration Isolator ◽  
Damage Factor ◽  
Damage Degree ◽  
Sudden Failure ◽  
Metal Rubber ◽  
Damage Process

The fatigue damage test of metal rubber vibration isolator is performed, the result of which shows that fatigue damage performance of metal rubber is different from conventional solid materials. The damage of metal rubber which is accumulated with its inner partial broken and wore wires, results in deterioration of its macro-mechanical characteristic, macro-cracking and final fatigue failure, so it does not rupture as sudden failure of solid material. It is difficult to describe damage evolution of metal rubber in the microscopic perspective, and from a macro point of view, it is feasible method to describe degree of fatigue damage which bases on the changes of mechanical properties. In order to reflect the incremental cumulative damage degree of metal rubber, the stiffness damage and damping damage are used to accurately describe the fatigue damage process of metal robber, and the comprehensive damage factor is proposed to be the fatigue failure criterion. Damage factor can predict fatigue life of metal rubber specimen accurately, so it has reference significance to design of metal rubber

Vibration Isolator System for Electron Microscope

1990 ◽  
Vol 48 (1) ◽  
pp. 182-183
Author(s):  
K. Ohi ◽  
M. Mizuno ◽  
T. Kasai ◽  
Y. Ohkura ◽  
K. Mizuno ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Magnetic Fields ◽  
Environmental Conditions ◽  
Vibration Isolator ◽  
Air Conditioners ◽  
Vibration Isolators ◽  
Large Size ◽  
Electron Microscopes

In recent years, with electron microscopes coming into wider use, their installation environments do not necessarily give their performance full play. Their environmental conditions include air-conditioners, magnetic fields, and vibrations. We report a jointly developed entirely new vibration isolator which is effective against the vibrations transmitted from the floor.Conventionally, large-sized vibration isolators which need the digging of a pit have been used. These vibration isolators, however, are large present problems of installation and maintenance because of their large-size.Thus, we intended to make a vibration isolator which1) eliminates the need for changing the installation room2) eliminates the need of maintenance and3) are compact in size and easily installable.

Cracking at the fold in double layer coated paper: the influence of latex and starch composition

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 93-99
Author(s):  
SEYYED MOHAMMAD HASHEMI NAJAFI ◽  
DOUGLAS BOUSFIELD, ◽  
MEHDI TAJVIDI
Keyword(s):  
Mechanical Properties ◽  
Double Layer ◽  
Starch Content ◽  
Single Layer ◽  
Double Layers ◽  
Coated Paper ◽  
Coated Papers ◽  
Coating Layers ◽  
Scanned Images ◽  
Packaging Paper

Cracking at the fold of publication and packaging paper grades is a serious problem that can lead to rejection of product. Recent work has revealed some basic mechanisms and the influence of various parameters on the extent of crack area, but no studies are reported using coating layers with known mechanical properties, especially for double-coated systems. In this study, coating layers with different and known mechanical properties were used to characterize crack formation during folding. The coating formulations were applied on two different basis weight papers, and the coated papers were folded. The binder systems in these formulations were different combinations of a styrene-butadiene latex and mixtures of latex and starch for two different pigment volume concentrations (PVC). Both types of papers were coated with single and double layers. The folded area was scanned with a high-resolution scanner while the samples were kept at their folded angle. The scanned images were analyzed within a constant area. The crack areas were reported for different types of papers, binder system and PVC values. As PVC, starch content, and paper basis weight increased, the crack area increased. Double layer coated papers with high PVC and high starch content at the top layer had more cracks in comparison with a single layer coated paper, but when the PVC of the top layer was low, cracking area decreased. No measurable cracking was observed when the top layer was formulated with a 100% latex layer.

A Survey on Crypto-Steganographic Schemes and A Use Case in Healthcare System

2019 ◽  
Vol 1 (2) ◽  
pp. 25-33
Author(s):  
Mei Ling Phang ◽  
Swee Huay Heng
Keyword(s):  
Social Networking ◽  
Information Sharing ◽  
Healthcare System ◽  
Double Layer ◽  
21St Century ◽  
Electronic Devices ◽  
Third Party ◽  
Use Case ◽  
Comparison Analysis ◽  
Information Assets

Information sharing has become prevalent due to the expansion of social networking in this 21st century. However, electronic devices are vulnerable to various kinds of attacks. Information might be disclosed, modified and accessed by an unauthorised third party which consequently leads to the breach of confidentiality, integrity and availability of the information. Therefore, it is of utmost importance to employ the technology of cryptography and steganography to protect information assets. Cryptography and steganography have weaknesses when they are working alone. Therefore, crypto-steganography, the combination of cryptography and steganography are introduced to overcome the weaknesses in order to provide a double layer of security and protection. This paper provides a general overview of steganography and cryptography as well as a comparison analysis of different crypto-steganographic schemes. A secure crypto-steganographic system for healthcare is then developed with the implementation and integration of the secure crypto-steganographic scheme proposed by Juneja and Sandhu. This healthcare system enables users to store and deliver message in a more secure way while achieving the main goals of both cryptography and steganography.

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