Dynamic Analysis of Multi-Supported Nonlinear Vibration Isolation System Mounted on Flexible Foundation

2013 ◽  
Vol 419 ◽  
pp. 223-227 ◽  
Author(s):  
Rui Huo ◽  
Hui Yu ◽  
Yan Feng Guan
Keyword(s):  
Numerical Solution ◽  
Nonlinear Vibration ◽  
Power Flow ◽  
Vibration Isolation ◽  
Engineering Application ◽  
System Dynamic ◽  
Dynamic Equations ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Flexible Foundation

In view of its prototype in engineering application, a theoretical model of multi-supported nonlinear vibration isolation system installed on flexible foundation is studied, including derivation of system dynamic equations and analysis of system dynamic characteristics. For effectiveness evaluation of nonlinear vibration isolation systems, a generalized time-averaged power is proposed as an extension of classical theory of vibratory power flow, and a numerical solution method of time-averaged power is probed accompanying with the numerical solution of nonlinear dynamic equations. In a further concrete calculation example, an air spring vibration isolation system of a small UAV engine is numerically simulated based on Runge-Kutta method, and dynamic behavior and power flow transmission characteristics influenced by system parameters are investigated.

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.

Research on Comprehensive Control of Vibration Isolation System with Flexible Foundation

2011 ◽  
Vol 55-57 ◽  
pp. 872-876
Author(s):  
De Zhen Feng ◽  
Fang Zhou ◽  
Zai Mei Zhang ◽  
Hua Guan Liu
Keyword(s):  
Power Flow ◽  
Vibration Isolation ◽  
Passive Control ◽  
Positive Control ◽  
Matrix Analysis ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Practical Engineering ◽  
Flexible Foundation ◽  
Vibrational Power Flow

The paper analyzes the dynamic relation of asymmetric multi-supported vibration isolation system with flexible foundation, establishes the comprehensive model of passive control and positive control system by using the effective matrix analysis method, analyzes the transmission mechanism and characteristic of vibrational power flow in the flexible vibration isolation system. In order to meet the need of the practical engineering, the paper analyzes and calculates the effect of the machine mass on the input and the transmission power flow in detail. At last, the paper puts forward the measure to reduce vibration energy transmission.

Study on Optimization Design of Hybrid Vibration Isolation System on Flexible Foundation

2005 ◽  
Author(s):  
Wei-Min Mao ◽  
Shi-Jian Zhu ◽  
Hui-Ming Jiang
Keyword(s):  
Optimization Design ◽  
Power Flow ◽  
Vibration Isolation ◽  
Design Method ◽  
System Structure ◽  
Parameter Method ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Global Sensitivity ◽  
Flexible Foundation

This article analyzes the process to design hybrid vibration isolation system on flexible foundation. The dynamic model of a hybrid vibration isolation system on flexible foundation is build and the character of power flow transmission is analyzed by sub-system structure impedance synthesis technique and four poles parameter method. The global sensitivity analysis with the Sobol’ method is used to study the global sensitivity behavior of the hybrid vibration isolation system. The multi-objective optimization design method of hybrid vibration isolation system is studied and the mathematic optimization model has been built. Gene algorithm has been used to solve the global optimization problem, and the numerical simulation is carried out.

Line spectra chaotification of the nonlinear vibration isolation system on the flexible foundation based on the open-plus-nonlinear-closed-loop method

2020 ◽  
pp. 107754632093376
Author(s):  
Kai Chai ◽  
Shuang Li ◽  
Jun J Lou ◽  
Xiang Yu ◽  
Yong S Liu ◽  
...  
Keyword(s):  
Nonlinear Vibration ◽  
Working Conditions ◽  
Vibration Isolation ◽  
Closed Loop ◽  
Initial Conditions ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Loop Control ◽  
Loop Method ◽  
Flexible Foundation

Line spectra chaotification is a principal method to weaken or eliminate the line spectra feature of submarines. However, this method is difficult to obtain chaos under the variable working conditions and small amplitudes. Furthermore, there are multistable attractors in the nonlinear vibration isolation system simultaneously. So, the quality of chaos highly depends on initial conditions and systematic parameters. In this study, the attractor entrainment control and line spectra chaotification of a nonlinear vibration isolation system on the flexible foundation have been studied by using the open-plus-nonlinear-closed-loop method. First, the dynamic equation of the nonlinear vibration isolation system on the flexible foundation was formulated, and its exhaustive bifurcation characteristics were analyzed. The regulations of global characteristics and coexistent attractors were found out. Second, the entrainments between the different attractors were carried out under the open-plus-nonlinear-closed-loop control, which can ensure the system always works in the lowest line spectra intensity and the best overall vibration isolation performance. Finally, an open-plus-nonlinear-closed-loop coupling method was used to achieve generalized chaotic synchronization between the driving system and the response system, which effectively obtained sustainable chaos even under variable working conditions and small amplitudes. Simulation results validate the feasibility and validity of the open-plus-nonlinear-closed-loop method, which achieves the dual goals of effective vibration isolation in the low frequency range and line spectra chaotification under variable working conditions.

Numerical Modelling of Nonlinear Vibration Isolation System Free Oscillations

2014 ◽  
Vol 1025-1026 ◽  
pp. 80-84 ◽  
Author(s):  
Vladimir Smirnov
Keyword(s):  
Numerical Solution ◽  
Nonlinear Vibration ◽  
Vibration Isolation ◽  
Equilibrium Points ◽  
Elastic Characteristic ◽  
Mathematical Representation ◽  
Free Oscillations ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Nonlinear Dynamic Equations

The article deals with numerical analysis of nonlinear vibration isolation system free oscillations. According to the latest recommendations [1], vibration isolation of precision equipment should be effective over the 1 – 100 Hz range [2]. This fact sets a challenge to develop a sub-herz vibration isolator. Such vibration isolators with 0.5 Hz natural frequency have been developed in latest works [3,4]. For mathematical representation of such a dynamical system, elastic characteristic should be approximated with a polynomial. In this paper, we consider the approximation of elastic characteristic by means of 5thand 7thorder polynomials. This leads to numerical solution of nonlinear dynamic equations. We construct the solution of such equation on the phase plane and determine equilibrium points. The stability of the equilibrium points is investigated using linearization technique. The law of the isolated mass oscillations is derived from numerical solution of the dynamic equation by means of Dorman – Prince 4(5) and 8(7) solver and the system’s natural frequencies are calculated using the FFT technique.

Research on Vibration Isolation Parameters of Double-Deck Isolation System of Heat Water Pump

2013 ◽  
Vol 694-697 ◽  
pp. 316-320
Author(s):  
Xiang Jun Kong ◽  
Er Ming Song ◽  
Chang Zheng Chen
Keyword(s):  
Power Flow ◽  
Vibration Isolation ◽  
Low Frequency ◽  
Mass Effect ◽  
Transmitted Power ◽  
Intermediate Mass ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Upper Deck ◽  
Vibration Power Flow

Isolation system of the heat water pumps can be simplified as a double sources exciting and double output double-deck vibration isolation system model, expressions of transmitted power flow and vibration speed to the basement are deduced based on the double sources exciting and double output double-deck vibration isolation system electric-force(E-F) analog picture, the curves of power flow and vibration speed transmitted to basement how the upper deck vibration isolation and intermediate mass effect are drawn by using mat lab program. The results show that the adjusting the upper deck vibration isolation stiffness parameters has little effect on the amplitude of vibration power flow, increasing intermediate mass can move first peak to the low frequency, increasing intermediate mass can obviously reduce t transmitted power flow and transmitted vibration speed amplitude to the basement.

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