scholarly journals Reconstruction of Input Excitation Acting on Vibration Isolation System

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Pan Zhou ◽  
Wen L. Li ◽  
Wanyou Li ◽  
Zhijun Shuai
Keyword(s):  
Vibration Isolation ◽  
Mechanical Design ◽  
Spectral Density Function ◽  
Dynamic Responses ◽  
Accurate Estimation ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Vibration Isolators ◽  
Supporting Structure ◽  
Vibration Prediction

Vibration isolation systems are widely employed in automotive, marine, aerospace, and other engineering fields. Accurate input forces are of great significance for mechanical design, vibration prediction, and structure modification and optimization. One-stage vibration isolation system including engine, vibration isolators, and flexible supporting structure is modeled theoretically in this paper. Input excitation acting on the vibration isolation system is reconstructed using dynamic responses measured on engine and supporting structure under in-suit condition. The reconstructed forces reveal that dynamic responses on rigid body are likely to provide more accurate estimation results. Moreover, in order to improve the accuracy of excitation reconstructed by dynamic responses on flexible supporting structure, auto/cross-power spectral density function is utilized to reduce measurement noise.

A Variable Stiffness Vibration Isolation System Based on Magneto-Rheological Elastomer

2012 ◽  
Vol 452-453 ◽  
pp. 659-662
Author(s):  
Wei Wang ◽  
Yi Min Deng
Keyword(s):  
Shear Modulus ◽  
Vibration Isolation ◽  
Variable Stiffness ◽  
Control Area ◽  
Frequency Range ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Vibration Isolators ◽  
Magneto Rheological ◽  
Conventional Type

Vibration isolation is a most widely used vibration protection method.The stiffness of vibration isolators in existing conventional type of vibration isolation system is usually of fixed value. This limits the system in exhibiting its vibration isolation effect in that, it has poor results for lower frequency vibration, especially for resonance frequency. Magneto-rheological elastomer is a new branch of Magneto-rheological materials. It’s an intelligent materials in that it’s shear modulus can be controlled by a magnetic field. It has wide application prospects in the vibration control area. This paper proposes using adjustable stiffness of magneto-rheological elastomer vibration isolation in vibration isolation system. By changing the current of vibration isolators coil to control the shear modulus of magneto-rheological elastomer, it can adjust the stiffness of the isolation system, making the system obtain wider vibration isolation frequency range. By exploying SimuLink software to analyze the vibration isolation system, it is found that such a design is effective and applicable.

Dynamic Analysis of Nonlinear Vibration Isolation System Based on Flexible Foundation

2014 ◽  
Vol 1030-1032 ◽  
pp. 766-769
Author(s):  
Shu Ying Li ◽  
Rui Huo ◽  
Xing Ke Cui ◽  
Cui Ping Liu ◽  
Dao Kun Zhang
Keyword(s):  
Nonlinear Vibration ◽  
Power Flow ◽  
Vibration Isolation ◽  
Low Frequency ◽  
Coupled System ◽  
Optimized Design ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Vibration Isolators ◽  
Flexible Foundation

In this paper,a general dynamic model of the isolation coupled system which is composed of isolation object,nonlinear vibration isolation support,and flexible foundation is established,calculated method of applying vibration power flow to analyze isolation effectiveness is studied.Further more,as an calculation example,a air spring vibration isolation system of HS-700 engines is numerically simulated.Designs several low-frequency nonlinear vibration isolators and analyzes its vibration isolation effect.It discusses the effect of the vibration isolator parameters on the transmitted power flow of the system.The results provide a theoretical basis for the optimized design of nonlinear vibration isolation system.

scholarly journals Vibration Protection of Sensitive Components of Infrared Equipment in Harsh Environments

2001 ◽  
Vol 8 (1) ◽  
pp. 55-69 ◽  
Author(s):  
A.M. Veprik ◽  
V.I. Babitsky ◽  
N. Pundak ◽  
S.V. Riabzev
Keyword(s):  
Vibration Isolation ◽  
Harsh Environments ◽  
Line Of Sight ◽  
Infrared Sensor ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Vibration Isolators ◽  
Vibration Protection ◽  
Electro Optic ◽  
Environmental Vibration

This article addresses the principles of optimal vibration protection of the internal sensitive components of infrared equipment from harsh environmental vibration. The authors have developed an approach to the design of external vibration isolators with properties to minimise the vibration-induced line-of-sight jitter which is caused by the relative deflection of the infrared sensor and the optic system, subject to strict constraints on the allowable sway space of the entire electro-optic package. In this approach, the package itself is used as the first-level vibration isolation stage relative to the internal highly responsive components.It was predicted analytically, and confirmed experimentally, that the proposed vibration isolation system would be capable of a sixfold reduction of the dynamic response of the infrared sensor as compared to the case of rigid mounting of the entire package.

STUDY OF THE VIBRATION ISOLATION SYSTEM OF MARINE POWER PLANTS WITH A 5AL 25/30 DIESEL DRIVE

Akustika ◽  
2021 ◽  
pp. 112
Author(s):  
Minas Minasyan ◽  
Armen Minasyan ◽  
Kyaw Thet Naing
Keyword(s):  
Experimental Study ◽  
Diesel Engine ◽  
Power Plants ◽  
Vibration Isolation ◽  
Field Studies ◽  
Absorption System ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Vibration Isolators ◽  
The Impact

The article is devoted to the study of the support and side stop vibration isolation system of two marine power plants DGA- 500 with a 5AL 25/30 drive diesel engine, in which a hypothesis is put forward about the imperfection of the shock absorption system. The purpose of the research is to substantiate the imperfection of the support and side stop vibration isolation system of marine power plants with a 5 AL 25/30 drive diesel engine. The confirmation of this hypothesis and the achievement of this goal is justified on the basis of presentation of the results of field studies on the project’s courts B437/11 and the personal presence during the preparation of DGA-500 to repair at the shipyard. For the use of unbalanced engines as a drive for ship power plants, the authors, on the basis of a full-scale experimental study and analysis of known works, recommend initially assessing the possibility and purpose of depreciation of the unit according to the Katz unbalance criterion [1]. The objective of fixing the unit with diesel 5AL 25/30 on the criterion of imbalance Katz is soundproof, and the calculation of depreciation should be based on the impact of side stop vibration isolators. A significant improvement is recommended to the support 36-40 and side stop 41-52 vibration isolation system, elastic pipe fittings 8, support frame 2 and turbocharger bracket 4 (Fig. 1).

Vibration Isolation

2021 ◽  
pp. 299-312
Author(s):  
C. Julian Chen
Keyword(s):  
Eddy Current ◽  
Vibration Isolation ◽  
Mechanical Design ◽  
Two Stage ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Suspension Spring ◽  
Environmental Vibration ◽  
Eddy Current Damping ◽  
Elementary Mechanics

This chapter discusses vibration isolation of STM and AFM. First, the basic concepts of vibration isolation are illustrated by a one-dimensional system using elementary mechanics. The source of vibration, the environmental vibration, its characteristics, and methods of measurement are presented. The importance of vibration isolation at the laboratory foundation level and the proper mechanical design of STM and AFM are then discussed. The focus of this chapter in on the most important vibration isolation system: two-stage suspension spring with eddy-current damping. A detailed analysis of the two-stage spring system as well as aspects of practical design is presented. The principles and design charts for eddy-current damping system are discussed. Finally, the commercial pneumatic vibration isolation system is briefly discussed.

scholarly journals A Synthesis Model for Forcing Action Arrangement in the System of Reducing Dynamic Loads of a Mobile Machine

2015 ◽  
Vol 20 (2) ◽  
pp. 437-443 ◽  
Author(s):  
H. Kaźmierczak ◽  
T. Pawłowski ◽  
K. Zembrowski
Keyword(s):  
Analytical Model ◽  
Dynamic Characteristics ◽  
Vibration Isolation ◽  
Dynamic Loads ◽  
Dynamic Susceptibility ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Supporting Structure ◽  
System Vibration ◽  
Mobile Machine

Abstract An idea is presented for a method to lower excessive dynamic loads in the system of supporting structure, mechanical-hydraulic forcing system, vibration isolation system, protective unit. The dynamic characteristics of the system are determined by the method of dynamic susceptibility. An analytical model of the system was built (mobile machine to carry out protective treatments; project WDN-POIG.01.03.01-00-164/09).

A New Method for the Optimization of a Vibration Isolation System

1990 ◽  
Vol 112 (3) ◽  
pp. 413-416 ◽  
Author(s):  
Y. Lin ◽  
W. Luo ◽  
Y. M. Zhang
Keyword(s):  
Optimal Control ◽  
Vibration Isolation ◽  
High Efficiency ◽  
High Reliability ◽  
Vibration Isolator ◽  
Reliability Of Results ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Vibration Isolators ◽  
Programming Algorithms

Formerly the optimization of the passive vibration isolator is mainly founded on the nonlinear programming algorithms. The methods are iterative in nature and time-consuming. In this paper a frequency domain suboptimal method is developed for the optimization of the passive vibration isolators. The method is based on the linear optimal control results and has advantages of high efficiency in computation and high reliability of results. It is especially applicable to the microcomputer environment.

Study on Characteristics of Dry Friction Plate-Reset Spring Seismic Isolation System

2013 ◽  
Vol 353-356 ◽  
pp. 1811-1814
Author(s):  
Jian Yu Chu ◽  
Nan Ge ◽  
Ling Li Chen ◽  
Shi Yong Zhao
Keyword(s):  
Dry Friction ◽  
Seismic Isolation ◽  
Vibration Isolation ◽  
The Other ◽  
Dynamic Responses ◽  
Seismic Action ◽  
Elastic Coefficient ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Friction Plate

The seismic dynamic responses on two buildings with the vibration isolation system have been evaluated and the results show that the dry friction plate-reset spring isolation system is apparently effective if the reasonable parameters could be obtained by optimization. The maximum inter-storey drift could be drastically decreased by about 80% at base storey or about 60% at top storey. The elastic coefficient of the reset spring should be larger than the lower limit in order for the effective reposition ability of the system. On the other hand, the influence of the vertical seismic action to the horizontal dynamic response is so small that it could be neglected.

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