scholarly journals Analysis of vibration isolation performance of parallel air spring system for precision equipment transportation

2019 ◽  
Vol 52 (3-4) ◽  
pp. 291-302 ◽  
Author(s):  
Di Qu ◽  
Xiandong Liu ◽  
Guangtong Liu ◽  
Yifan Bai ◽  
Tian He
Keyword(s):  
Vibration Isolation ◽  
Rigid Body Dynamics ◽  
Dynamics Simulation ◽  
Railway Transportation ◽  
Air Spring ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Precision Equipment ◽  
Spring System ◽  
Isolation Requirements

Precision equipment is usually accompanied with vibrations during road or railway transportation. Sometimes the vibration exceeds the given limit, leading to the damage of the equipment. It is necessary to control the vibration during the transportation. However, it is still difficult to adjust the parameters of a designed vibration isolation system for the transportation of different precision equipment under various road conditions. Aiming at satisfying the vibration isolation requirements of different precision equipment, this paper proposes a parallel air spring vibration isolation system based on the principle of limiting lateral deflection. According to the measured parameters, a rigid-body dynamics simulation model of parallel air spring vibration isolation system is established. Then its feasibility is verified, and the optimal parameters of the vibration isolation system are obtained by a simulation. Finally, the vibration isolation system is built and installed in the equipment to carry out the real vehicle transportation test. The test results show that the transportation vibration isolation system based on the parallel air spring structure has not only excellent vibration isolation efficiency but also acceptable lateral stability. The research results in this paper can provide a reference for the design of the vibration isolation system for the large precision equipment transportation.

Research on Modeling and Optimization of a Dual Chamber Air Spring Vibration Isolation System

2013 ◽  
Vol 702 ◽  
pp. 310-317 ◽  
Author(s):  
Cheng Zhang ◽  
Jian Fu Zhang ◽  
Ping Fa Feng ◽  
Ding Wen Yu ◽  
Zhi Jun Wu
Keyword(s):  
Vibration Isolation ◽  
Structural Parameters ◽  
Dynamic Stiffness ◽  
Theoretical Models ◽  
Air Spring ◽  
Dual Chamber ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Spring System ◽  
Stiffness And Damping

To improve the vibration isolation performanceof an air spring system,the characteristics of the dynamic stiffness and damping of adual chamber air springwere first analyzed. A theoretical model ofa four dual chamber air springs system wasthen constructed,and through experimental verification,the theoretical and experimental curves showedthe same change trend.Based on the theoretical models, anobjective function used to optimize the structural parameters of an air springwas constructed. It was demonstrated that the vibration isolation performance of the air spring system was improved with the optimized parameters.

Multi-objective optimization of composite two-stage vibration isolation system for sensitive equipment

2016 ◽  
Vol 14 (2) ◽  
pp. 343-361
Author(s):  
Wei Huang ◽  
Jian Xu ◽  
Dayong Zhu ◽  
Cheng Liu ◽  
Jianwei Lu ◽  
...  
Keyword(s):  
Thin Plate ◽  
Vibration Isolation ◽  
Composite System ◽  
Optimization Technique ◽  
Two Stage ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Content Type ◽  
Multi Objective ◽  
Precision Equipment

Purpose The purpose of this paper is to propose a novel strategy of optimal parameters configuration and placement for sensitive equipment. Design/methodology/approach In this study, clamped thin plate is considered as the foundation form, and a novel composite system is proposed based on the two-stage isolation system. By means of the theory of mechanical four-pole connection, the displacement amplitude transmissibility from the thin plate to precision equipment is derived. For the purpose of performing optimal design of the composite system, a novel multi-objective idea is presented. Multi-objective particle swarm optimization (MOPSO) algorithm is adopted as an optimization technique, which can achieve a global optimal solution (gbest), and selecting the desired solution from an equivalent Pareto set can be avoided. Maximum and variance of the four transmitted peak displacements are considered as the fitness functions simultaneously; the purpose is aimed at reducing the amplitude of the multi-peak isolation system, meanwhile pursuing a uniform vibration as far as possible. The optimization is mainly organized as a combination of parameter configuration and placement design, and the traversal search of discrete plate is performed in each iteration for the purpose of achieving the global optimum. Findings An important transmissibility based on the mechanical four-pole connection is derived, and a composite vibration isolation system is proposed, and a novel optimization problem is also defined here. This study reports a novel optimization strategy combined with artificial intelligence for parameters and placement design of precision equipment, which can promote the traditional view of two-stage vibration isolation. Originality/value Two-stage vibration isolation systems are widely applied to the vibration attenuation of precision equipment, but in these traditional designs, vibration participation of foundation is often ignored. In this paper, participation of foundation of equipment is considered, and a coherent new strategy for equipment isolation and foundation vibration is presented. This study shows a new vision of interdisciplinary including civil engineering, mechanical dynamics and computational science.

Dynamics Analysis and Simulation of Drum Washing Machine Vibration Isolation System

2013 ◽  
Vol 441 ◽  
pp. 439-442
Author(s):  
Rui Ying Shao ◽  
Hong Jun Wang ◽  
Juan Song ◽  
Hai Yan Wang
Keyword(s):  
Vibration Isolation ◽  
Simulation Analysis ◽  
Virtual Prototype ◽  
Dynamics Simulation ◽  
Prototype Model ◽  
Washing Machine ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Machine Vibration ◽  
Theory Research

Based on the theory research and virtual prototype technology, the dynamics characteristics of drum washing machine vibration isolation system is studied and analyzed. According to the Lagrange method, the dynamics equations and motion differential equations of drum washing machine vibration isolation system is established. Through the establishment of rigid parameterized virtual prototype model of the vibration system, dynamics simulation analysis is accomplished based on ADAMS, the kinematics characteristics and mechanical characteristics are obtained.

Study on the Sensitivity of Controllable Parameters in an Active Vibration Isolation System of Air Spring With Rubber Bellow

2005 ◽  
Author(s):  
Chang-Geng Shuai ◽  
Lin He ◽  
Zhi-Qiang Lv
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Vibration Isolation ◽  
Vertical Displacement ◽  
Control Parameters ◽  
Air Spring ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Vertical Stiffness ◽  
Active Vibration

The characteristics of control parameters of air spring with rubber bellow are analyzed through finite element method and thermodynamic equation respectively. The analysis results indicate that the vertical stiffness of air spring is sensitive to the varying of vertical displacement and volume, and nonlinearly varies with vertical displacement. When the air spring is pressed down or pulled up under the exterior excitation, the height of air spring can be controlled to keep stable through adjusting the volume of air spring by the use of hydraulic transformer.

Analysis and Experiment of an Air Vibration Isolation System with Auxiliary Chambers

2012 ◽  
Vol 226-228 ◽  
pp. 195-198
Author(s):  
Rong Wei Wen ◽  
Jiu Bin Tan ◽  
Lei Wang ◽  
Guan Hua Wang
Keyword(s):  
Resonant Frequency ◽  
Vibration Isolation ◽  
Excitation Frequency ◽  
Volume Ratio ◽  
Air Spring ◽  
Working Pressure ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Vibration Transmissibility ◽  
System Vibration

A mathematical model of a single degree of freedom air spring vibration isolation system is established. The model analyzes the influence of structural damping in the air spring vibration isolation system based on the traditional model. This paper establishes the relationship between the working pressure p, the volume ratio of n and system vibration transmissibility T under forced vibration. The experimental results are verified on different working pressure. The results showed that working pressure p has little effect on the resonant frequency of the system and the system vibration transmissibility. The smaller the ratio n, the lower the resonant frequency of the system and the system vibration transmissibility. The environmental excitation frequency range must be taken into account in designing.

Hierarchical Intelligent Alignment Control of Air Spring Vibration Isolation System of Ship Propulsion Plant

2013 ◽  
Vol 419 ◽  
pp. 630-635
Author(s):  
Wen Jun Bu ◽  
Ying Long Zhao ◽  
Liang Shi
Keyword(s):  
Intelligent Control ◽  
Vibration Isolation ◽  
Control Method ◽  
Good Control ◽  
Air Spring ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Speed Test ◽  
And Control ◽  
Layer Control

Alignment control of propulsion plant air spring vibration isolation system is a complicated Multi objects control problem. In this paper a new hierarchical intelligent control method of alignment control is brought out. Known from current hierarchical intelligent control methods with three layers, this method consists of task layout layer, control decision-making layer, control layout layer and control executive layer. The complicated alignment control task is decomposed into four hierarchical layers to reduce complexity. The control system has good control convergence capability and fast convergence speed. Test results validate the feasibility of this method.

Semi-Active Method of Motion Stabilization Applied to Mechanical System with the Constant Reaction Force Vibroisolation (CRF) – Model Study

2016 ◽  
Vol 248 ◽  
pp. 103-110
Author(s):  
Marian Witalis Dobry
Keyword(s):  
Mathematical Model ◽  
Energy Efficiency ◽  
Mechanical System ◽  
Vibration Isolation ◽  
Reaction Force ◽  
Magnetorheological Damper ◽  
Dynamics Simulation ◽  
System Stability ◽  
Isolation System ◽  
Vibration Isolation System

The use of the CRF vibration isolation system with zero natural frequency for machinery and equipment in the Earth's gravity field requires stabilization of motion because of its high susceptibility. For this purpose, an additional spring element with a low elastic coefficient “k1” and a semi-active damper “c (t, x, v, ff)”, was included in the vibration isolation system and parallel-attached to the CRF vibroisolator. Investigation of the effect of the additional element to stabilize the motion of the mechanical system was carried out by a numerical simulation of its motion. The simulation was based on a physical and mathematical model of the system including the spring and the magnetorheological damper (MR). The mathematical model was then used to develop a dynamics simulation program of the system and conduct simulations using sample data in order to study transitional processes and their stability. Simulation results indicate a substantially improved stability of motion in the system. Stability studies of motion were also combined with an analysis of power distribution in the system. The aim of this study was to determine energy efficiency of the system developed, defined as the ratio of the RMS power of the exciting force to RMS power of the elastic force. The resulting energy efficiency of CRF vibroisolation was equal to 5168 for a simulation period of 6 seconds.

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