Vibration Sensitivity Analysis of the Secondary Isolation Support

2013 ◽  
Vol 278-280 ◽  
pp. 18-21 ◽  
Author(s):  
Bo Song ◽  
Fang Zhen Song ◽  
Chuan Guang Ding
Keyword(s):  
Sensitivity Analysis ◽  
Design Process ◽  
Dynamic Characteristics ◽  
Vibration Isolation ◽  
Dynamic Performance ◽  
Plate Thickness ◽  
Design Parameters ◽  
Spring Stiffness ◽  
Optimization Parameters ◽  
Influence Degree

The second vibration isolation support (SVIS) is very important parts of the vibration engineering equipment, and its dynamic performance will affect the operating condition of the entire device. In the design process, the sensitivity of design parameters provides a very effective way for design of SVIS. By analyzing the sensitivity of the amplitude of SVIS relative to the mass of SVIS, the spring stiffness and the operating frequency, as well as the sensitivity of the modal natural frequency relative to the plate thickness, the influence degree of these design parameters on the dynamic characteristics of SVIS were obtained and the best optimization parameters the structure of SVIS were obtained.

Integration of an Automatic Optimizer Functionality Into the Design Process of Industrial Steam Turbines

2012 ◽  
Author(s):  
Dimitri Drapkin ◽  
Franz Kores ◽  
Thomas Polklas
Keyword(s):  
Design Process ◽  
Optimization Methods ◽  
Simultaneous Optimization ◽  
Design Parameters ◽  
Optimization Approach ◽  
Steam Turbines ◽  
Particle Swarm Optimizer ◽  
Optimization Task ◽  
Wide Range ◽  
Optimization Parameters

Industrial steam turbines are mostly tailor made machinery, varying in a wide range of specifications. This feature introduces high requirements on the design process which has to be flexible, efficient and fast at the same time. Given live steam and design parameters as input, the geometry corresponding to the valid design scheme can be calculated together with the required thermodynamic, aerodynamic and mechanical characteristics. By variation of design parameters a design may be achieved which optimizes both, efficiency and cost. The optimization task is formulated mathematically, e.g. crucial optimization parameters, criteria for evaluation of different designs and other required constraints are selected. The structure of the resulting optimization problem is analyzed. Based on this analysis a modular optimization system design is proposed. The choice of Genetic Algorithms and Adaptive Particle Swarm Optimizer as optimization methods is discussed, recommendations for their proper use are given. A bicriterial optimization approach for a simultaneous optimization of efficiency and cost is developed.

Study of the Static and Dynamic Performance of Rectangular Air Pads by Means of Lumped Parameters Models

2012 ◽  
Author(s):  
Guido Belforte ◽  
Federico Colombo ◽  
Terenziano Raparelli ◽  
Andrea Trivella ◽  
Vladimir Viktorov
Keyword(s):  
Pressure Distribution ◽  
Design Process ◽  
Dynamic Characteristics ◽  
Analytical Methods ◽  
Dynamic Performance ◽  
Operating Conditions ◽  
Positioning Systems ◽  
Static And Dynamic Characteristics ◽  
Distributed Parameters ◽  
Lumped Parameters

Externally pressurized gas bearings are widely used in linear guide-ways for measuring machines and precision positioning systems. The number and the diameter of the supply orifices and their position strongly influence the characteristic of the pad. Usually during the design process of a pad a distributed parameters model is used to simulate the pressure distribution under the pad because it doesn’t exist a general formula suitable for all possible geometries. Analytical methods can be applied for simplified geometries to calculate static and dynamic performance of pneumatic bearings. Analytical and lumped parameters models are of faster implementation with respect to distributed parameters models and are easier to implement in the design process. The present paper proposes different lumped parameters models to obtain the static and dynamic characteristics of pneumatic pads. These methods can be used in order to optimize the stiffness in correspondence of the operating conditions. Rectangular air pads of size 30×60 mm are considered. The results are compared with that obtained with a distributed parameters model to estimate the accuracy of the models.

scholarly journals Global Sensitivity Analysis of the Vibration Reduction System with Seated Human Body

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Igor Maciejewski ◽  
Tomasz Krzyzynski
Keyword(s):  
Sensitivity Analysis ◽  
Vibration Isolation ◽  
Global Sensitivity Analysis ◽  
Operating Conditions ◽  
Design Parameters ◽  
Global Sensitivity ◽  
Seat Suspension ◽  
Sensitivity Indices ◽  
Vibration Transmissibility ◽  
Nonlinear Force

The paper deals with the global sensitivity analysis for the purpose of shaping the vibroisolation properties of suspension systems under strictly defined operating conditions. The variance-based method is used to evaluate an influence of nonlinear force characteristics on the system dynamics. The proposed sensitivity indices provide the basis for determining the effect of key design parameters on the vibration isolation performance. The vibration transmissibility behaviour of an exemplary seat suspension system is discussed in order to illustrate the developed methodology.

RESEARCH ON THE INFLUENCE OF SPRING STIFFNESS IN AN ER ISOLATOR

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1635-1640
Author(s):  
JUAN WANG ◽  
SHAOHUA ZHANG
Keyword(s):  
Electric Field ◽  
Vibration Isolation ◽  
Dynamic Properties ◽  
Structural Parameters ◽  
Dynamic Stiffness ◽  
Dynamic Performance ◽  
Spring Stiffness ◽  
Isolation System ◽  
Tunable Range ◽  
Working Principle

In this paper, the problem of Electrorheological(ER) technology's application in the vibration isolation system is empirically studied. Based on the particular characteristics of the Electrorheological Fluids (ERF) tunable damping, a metal-spring ER isolator was designed and its working principle is mainly discussed. By theoretical analysis of its simplified physical model, the dynamic response of an ER isolator is frequency- and amplitude- dependent and sensitive to structural parameters. The controllable parameters here can be the system equivalent spring stiffness K and damping coefficient C of ERF. With experiment, the exertion of ER effect was controlled through the change of K and C. Consequently, the system dynamic stiffness, which is used to describe the dynamic properties of system isolation performance, can be changed obviously. According to the dynamic performance tests, the result confirmed that applying different electric field strength could change the dynamic peculiarity of the metal-spring ER isolator. The configuration design of the ER equipment, such as stiffness ratio of two fluid chambers and the size of the electric field, which are important factors for the tunable range of ER isolator.

Analysis on the Influencing Factors of Dynamic Characteristics for the Linear Motion Station of DCG

2013 ◽  
Vol 437 ◽  
pp. 194-197
Author(s):  
Xiao Peng Li ◽  
Xing Ju ◽  
Guang Hui Zhao ◽  
Ya Min Liang ◽  
Hao Tian Yang
Keyword(s):  
Dynamic Characteristics ◽  
High Speed ◽  
Dynamic Performance ◽  
Cnc Machine Tools ◽  
Joint Surface ◽  
Design Parameters ◽  
Machining Accuracy ◽  
Cnc Machine ◽  
Element Analysis ◽  
Feed Drive

Dynamic characteristics of the system have been given more and more attention so as to improve the retention and reliability of machining accuracy. Research has shown that dynamic performance of the feed drive mechanism has significant impact on the processing quality and efficiency of CNC. This paper mainly focuses on the DCG which realizes its motion on the basis of a pair of lead screw. The dynamic performance of the DCG was analyzed by the method of finite element analysis. DCG structure and the key design parameters of the rail joint surface have been studied to find out the influence on its dynamic characteristics. These researches provided a basis for the realization of the CNC feed motion of high-speed and high-precision. Besides, it is also possible to improve the overall performance of CNC machine tools.

scholarly journals Enhance Derivative Design Considering Global Sensitivity of Design Parameters

2013 ◽  
Author(s):  
Hyeong-UK Park ◽  
Kamran Behdinan ◽  
Joon Chung ◽  
Jae-Woo Lee
Keyword(s):  
Sensitivity Analysis ◽  
Design Process ◽  
Life Cycle Cost ◽  
Global Sensitivity Analysis ◽  
Collaborative Optimization ◽  
Design Parameters ◽  
Fast Method ◽  
Engineering Product ◽  
Global Sensitivity ◽  
Design Variables

An engineering product design considers derivatives to reduce the life cycle cost and to increase the efficiency on operation when it has new demands. The proposed design process in this study obtains derivative designs based on sensitivity of design variable. The efficiency and accuracy of the derivative design process can be enhanced by implementing global sensitivity analysis. Sensitivity analysis sensors the design variables accordingly and variables with low sensitivity for objective function can be neglected, since computational effort and time is not necessary for a design with less priority. In this research, e-FAST method code for global sensitivity analysis module was developed and implemented on Multidisciplinary Design Optimization (MDO) problem. The wing design was considered for MDO problem that used aerodynamics and structural disciplines. The global sensitivity analysis method was applied to reduce the number of design variables and Collaborative Optimization (CO) was used as MDO method. This research shows the efficiency of reduction of dimensionality of complex MDO problem by using global sensitivity analysis. In addition, this result shows important design variables for design requirement to student when they solving design problem.

scholarly journals Influence of a Vibration Isolation System on Planar Dynamics of a Motorcycle

2020 ◽  
Vol 25 (1) ◽  
pp. 96-103
Author(s):  
Sudhir Kaul
Keyword(s):  
Simple Model ◽  
Design Process ◽  
Dynamic Characteristics ◽  
Vibration Isolation ◽  
Ride Comfort ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Natural Modes ◽  
The Impact ◽  
Unsprung Mass

This paper examines a model to investigate the impact of a vibration isolation system on the planar (in-plane) dynamics of a motorcycle. While it is not very common, a vibration isolation system is used in some motorcycles to mitigate vibrations resulting from the shaking forces of the engine. For such layouts, the powertrain is assembled to the frame through the vibration isolation system that typically consists of two to four isolators. It is critical to comprehend the influence of the isolation system on the overall dynamic characteristics of the motorcycle due to the coupled dynamics of the rear suspension, the isolation system, and the rear unsprung mass. The influence of a vibration isolation system on the in-plane dynamics is analysed by using a relatively simple model that has been developed in this study. This model has been used to evaluate the influence of the isolation system on natural modes, transmissibility, and ride comfort. Results indicate that the use of a vibration isolation system couples the rear unsprung hop to the pitch motion of the powertrain with a slight increase in the corresponding natural frequency. Results indicate that the use of a vibration isolation system directly affects handling of the motorcycle. Furthermore, results indicate that the pitch of the sprung mass and the hop of the rear unsprung mass are particularly influenced by the vibration isolation system. The model presented in this paper could be useful in the early stages of the design process to compare the rigidly mounted powertrain to different layouts of the vibration isolation system.

A Study on Flange Lathe of Double-Tool Holder Based on Optimization Design Method of FE

2011 ◽  
Vol 48-49 ◽  
pp. 118-122
Author(s):  
Fu Qiang Ying ◽  
Yi Wang ◽  
Ling Dong Wu ◽  
Liang Yi Li
Keyword(s):  
Sensitivity Analysis ◽  
Optimization Design ◽  
Natural Frequencies ◽  
Design Method ◽  
Dynamic Performance ◽  
The Other ◽  
Design Parameters ◽  
Fe Model ◽  
Tool Holder ◽  
Dynamic Performances

With the optimization design method of FE,the FE model of vertical flange lathe beam of double-tool holder was established,the sensitivity analysis of dynamic performance for the machine tool was performed based on presented modal analysis and probability analysis.The influence rules of the first four natural frequencies affected by the design parameters of the lathe beam were confirmed and the weaknesses of it were indicated as well.Then, the structure of the lathe beam was optimized.As a result ,the dynamic performances of the lathe beam are improved and it offers the basis for the optimization design of the other lathe parts.

The Sensitivity Analysis of Cam Mechanism Dynamics

1982 ◽  
Vol 104 (2) ◽  
pp. 476-481 ◽  
Author(s):  
S.-S. D. Young ◽  
T. E. Shoup
Keyword(s):  
Sensitivity Analysis ◽  
Dynamic Performance ◽  
Global Optimum ◽  
Design Parameters ◽  
System Response ◽  
Total System ◽  
Cam Mechanism ◽  
Sensitivity Analysis Method ◽  
Eigenvector Derivatives ◽  
Eigenvalue And Eigenvector

In order to improve the dynamic performance of a cam mechanism, it is desired to have a method that does not require a trial-and-error procedure based on total system re-analysis or re-synthesis. In this paper a new sensitivity analysis method will be presented that allows the designer to make system modifications to move the design in the direction of the global optimum. To implement this method the output response of the system is first expressed in terms of the system eigendata. Then an efficient procedure for determining sensitivity of the system response to changes in individual system parameters is developed utilizing the eigenvalue and eigenvector derivatives with respect to the system design parameters. An example of a double lever cam mechanism with a four-degree-of-freedom dynamic system model is used to illustrate the technique.

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