Design of a vibration isolation system using eddy current damper

2013 ◽  
Vol 228 (4) ◽  
pp. 664-675 ◽  
Author(s):  
Partha Paul ◽  
Chetan Ingale ◽  
Bishakh Bhattacharya
Keyword(s):  
Eddy Current ◽  
Vibration Isolation ◽  
Eddy Currents ◽  
High Efficiency ◽  
Experimental Studies ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Analysis And Design ◽  
Passive Vibration Isolation ◽  
Eddy Current Damper

This article aims at modeling, analysis and design of a passive vibration isolation system using a magnetic damper with high efficiency and compactness. The experimental set-up was developed for a single degree-of-freedom vibration isolation system, where the damper consists of two elements: an outer stationary conducting tube made up of copper and a moving core made up of an array of three ring-shaped neodymium magnets of Nd–Fe–B alloy separated by four block cylinders made of mild steel that are fixed to a steel rod. The generation of eddy currents in the conductor and its resistance causes the mechanical vibration to dissipate heat energy. The vibration response of the system is obtained starting from a low-frequency range. The proposed magnetic damper achieves a maximum transmissibility value less than two for a natural frequency that is less than 10 Hz and the excitations at higher frequencies are successfully isolated. Numerical and experimental studies were carried out for a range of system parameters which show that isolators based on magnetic damping could be very effective for passive vibration isolation. Further, a theoretical model for an active isolation system is proposed in order to reduce the transmissibility at resonance. It is envisaged that the combined active–passive eddy current damper could be effectively used for vibration isolation.

Design and analysis of a vibration isolation system with cam–roller–spring–rod mechanism

2021 ◽  
pp. 107754632110005
Author(s):  
Yonglei Zhang ◽  
Guo Wei ◽  
Hao Wen ◽  
Dongping Jin ◽  
Haiyan Hu
Keyword(s):  
Vibration Isolation ◽  
Dynamic Stiffness ◽  
Experimental Studies ◽  
Excitation Amplitude ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Stiffness Characteristic ◽  
Negative Stiffness Mechanism ◽  
Isolation Systems ◽  
Vibration Isolation Performance

The vibration isolation system using a pair of oblique springs or a spring-rod mechanism as a negative stiffness mechanism exhibits a high-static low-dynamic stiffness characteristic and a nonlinear jump phenomenon when the system damping is light and the excitation amplitude is large. It is possible to remove the jump via adjusting the end trajectories of the above springs or rods. To realize this idea, the article presents a vibration isolation system with a cam–roller–spring–rod mechanism and gives the detailed numerical and experimental studies on the effects of the above mechanism on the vibration isolation performance. The comparative studies demonstrate that the vibration isolation system proposed works well and outperforms some other vibration isolation systems.

Vibration Protection of Historical Buildings Located near the Lines of Urban Rail Transport

2019 ◽  
Vol 945 ◽  
pp. 318-324
Author(s):  
Vladimir Smirnov
Keyword(s):  
Vibration Isolation ◽  
System Analysis ◽  
Design Procedure ◽  
Ground Surface ◽  
Field Measurements ◽  
Railway Track ◽  
Soil Pressure ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Analysis And Design

Besides the underground, the second common type of public transport is the tram. Tram lines in Moscow city center, as well as in other cities in Russia, are being renovated and reconstructed. Vibration of the railway track travels through the ground to the foundation of buildings adjacent to tram lines, causing high vibration and structure-borne noise levels inside them. The article presents result of a vibration isolation system analysis and design for a building, located in 37m of the two-lanes tram line. Prior to design procedure, field measurements were made and vibration levels inside the building were recorded. The vibration isolation system design included calculation of soil pressure on the isolation pad and subsequent estimation of the elastomeric pad dynamic modulus. Using this data, the eigenfrequecny of vibration isolation system was derived and its efficiency calculated. After the system maintenance, measurements were made to check the system’s performance. During the measurements acceleration of isolated part of the building and the ground surface were synchronously measured and transfer function derived.

scholarly journals Experimental Validation of Fly-Wheel Passive Launch and On-Orbit Vibration Isolation System by Using a Superelastic SMA Mesh Washer Isolator

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Seong-Cheol Kwon ◽  
Mun-Shin Jo ◽  
Hyun-Ung Oh
Keyword(s):  
Vibration Isolation ◽  
Application Form ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Static Tests ◽  
Resolution Observation ◽  
Passive Vibration Isolation ◽  
Basic Characteristics ◽  
Vibration Isolation Performance ◽  
Isolation Performance

On-board appendages with mechanical moving parts for satellites produce undesirable micro-jitters during their on-orbit operation. These micro-jitters may seriously affect the image quality from high-resolution observation satellites. A new application form of a passive vibration isolation system was proposed and investigated using a pseudoelastic SMA mesh washer. This system guarantees vibration isolation performance in a launch environment while effectively isolating the micro-disturbances from the on-orbit operation of jitter source. The main feature of the isolator proposed in this study is the use of a ring-type mesh washer as the main axis to support the micro-jitter source. This feature contrasts with conventional applications of the mesh washers where vibration damping is effective only in the thickness direction of the mesh washer. In this study, the basic characteristics of the SMA mesh washer isolator in each axis were measured in static tests. The effectiveness of the design for the new application form of the SMA mesh washer proposed in this study was demonstrated through both launch environment vibration test at qualification level and micro-jitter measurement test which corresponds to on-orbit condition.

Analysis and Design of Vibration Isolation System Using Open Trenches

2011 ◽  
Vol 11 (5) ◽  
pp. 364-369 ◽  
Author(s):  
G. L. Sivakumar Babu ◽  
Amit Srivastava ◽  
K. S. Nanjunda Rao ◽  
S. Venkatesha
Keyword(s):  
Vibration Isolation ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Analysis And Design

Modeling and Simulation of Passive Vibration Isolation System of Combustion Engine with Flexible Base

2012 ◽  
Vol 462 ◽  
pp. 419-426 ◽  
Author(s):  
Guo Qian Zhao ◽  
Hong Tian Zhang ◽  
Rui Guang Geng
Keyword(s):  
Flat Plate ◽  
Vibration Isolation ◽  
Combustion Engine ◽  
Rigid Base ◽  
Vibration Isolator ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Passive Vibration Isolation ◽  
Bearing Force ◽  
Flexible Base

Based on multi-body dynamics, finite element method and solid modeling technology, a dynamic model combined rigid bodies and flexible bodies about passive vibration isolation system of combustion engine with flexible base was built. A simulation analysis was done for a passive vibration isolation system of four-cylinder diesel supported on a flexible flat plate. Simulation result showed static balance and exciting force were same with theory calculation. Through changing support stiffness between flexible flat plate and ground, boundary condition of flexible base could be changed. And the characteristics of vibration isolation were obtained when combustion engine’s flexible base had different stiffness. Compared bearing force of vibration isolator on flexible base with bearing force on rigid base, the results could be gotten that flexible base had important influence to bearing force of vibration isolator and free vibration influenced by base’s flexibility might become main factor to influence change of vibration isolator’s bearing force.

Experimental Study of the Variable Stiffness Vibration Isolator

2011 ◽  
Vol 328-330 ◽  
pp. 2129-2133 ◽  
Author(s):  
Zhi Jun Shuai ◽  
Tie Jun Yang ◽  
Zhuo Liang Zhou ◽  
Zhi Gang Liu
Keyword(s):  
Natural Frequency ◽  
Vibration Isolation ◽  
Excitation Frequency ◽  
Low Frequency ◽  
Variable Stiffness ◽  
Resonance Problem ◽  
Vibration Isolator ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Passive Vibration Isolation

The traditional passive vibration isolation system can reduce the vibration transmission greatly while the excitation frequency is times higher than its natural frequency. As the external excitation approach its natural frequency, vibration isolator system is invalid. In this paper, a new variable stiffness vibration isolator was designed to solve the low-frequency resonance problem of the traditional isolator by combining toothed electromagnetic spring with passive isolator. Theoretical analysis and experimental results illustrate that this isolator met the design requirements and obtained the no resonance operating characteristic at the low frequency.

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