Analysis on Dynamic Characteristics of the Linear Rolling Guide Pair and Experiment

2011 ◽  
Vol 52-54 ◽  
pp. 989-994
Author(s):  
Xiao Peng Li ◽  
Wei Nie ◽  
Bang Chun Wen
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Characteristics ◽  
Machine Tools ◽  
Great Influence ◽  
Element Model ◽  
Joint Surface ◽  
Study Results ◽  
Rolling Guide ◽  
The Finite Element Model

Linear rolling guide is one of the most essential parts of the NC modern machine tools, and they play a significant supporting and guiding role in machine tools components. Especially, the joint surface between guides has great influence on machine's dynamic characteristics. According to this, in this work, taken the Japanese THK Corporation's SNS35LR rolling guide as specific study object, the finite element model of guide pair has been established with the joint surface influence considered. And by the method of the theoretical analysis with the experimental confirmation combined; the dynamic characteristics of the linear rolling guide pair's were studied relatively. Thus, the theoretical model and the finite element model established in this paper can be confirmed by the experiment. It has been found that the theoretical models established are consistent with the results of experiment. This study results can provide useful guidance for the dynamic analysis and the structure optimization of CNC machine tools, and numerical simulation in engineering and design in the development of such machines with rolling guide used.

Influence of Bolt Joint on Dynamic Characteristic of Linear Rolling Guide

2013 ◽  
Vol 307 ◽  
pp. 182-185
Author(s):  
Xiao Peng Li ◽  
Ya Min Liang ◽  
Hao Tian Yang ◽  
Xing Ju ◽  
Guang Hui Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Theoretical Result ◽  
Finite Element Model ◽  
Dynamic Characteristic ◽  
Great Influence ◽  
Element Model ◽  
Joint Surface ◽  
Element Analysis ◽  
Rolling Guide

Bolt joint has an important influence on the dynamic characteristic of guide rail. Linear rolling guide is chosen as the research object in this paper. Firstly, the dynamic model of the linear rolling guide joint surface is established and its natural frequency is figured out. Then we use ANSYS to make finite element analysis of guide on whether the bolt joint is considered or not. Finally, the validity of finite element model is verified through modal test. By comparing the results of the two kinds of finite element analysis with the theoretical result, we can conclude that the finite element model considering the bolts joint is closer to the theoretical result. So the bolt joint has a great influence on the dynamic characteristics of linear rolling guide. This paper provides the theoretical guide for the research on the bolt joint.

A New Method to Study the Joint Surfaces With Large Areas and its Application in Machine Tools

2013 ◽  
Author(s):  
Anan Zhou ◽  
Xiaopeng Wang ◽  
Tianning Chen
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Machine Tools ◽  
Element Model ◽  
Mode Shapes ◽  
Joint Surface ◽  
Element Analysis ◽  
Joint Surfaces ◽  
Contact Parameters ◽  
The Finite Element Model

In the finite element analysis (FEA) of machine tools, the study on contact parameters uses the data calculated by theory or identified by experiment directly, which may cause the great distinguish between the results obtained by FEA and by experiment. It is well known that the basic assumption on contact is the contact load of the joint surface stays the same throughout all areas. For the joint surfaces with small areas the loads are well-distributed and unchanged. But for the big joint surfaces the error will be very large with that assumption. A different method was proposed in this paper to calculate the parameters of joint surfaces with big areas. According to the different load conditions, we divided the joint surfaces into different parts and for each part the contact parameters were calculated respectively by the theory we established before. Substituting the parameters into the finite element model the result of FEA can be got. Moreover the methods on how to divide the joint surfaces into parts and how to apply the parameters to FEA of machine tools were also discussed. A dynamic experimental study on contact parameters was carried out. The first 3 natural frequencies and mode shapes of the experiment had a good agreement with the ones of FEA while the error was acceptable. As a result, for the joint surfaces with big areas such as those in machine tools, using the method proposed in this paper, the result of FEA will be more reasonable and the finite element model will be much closer to real one.

Hydroelastic Modal Analysis of the Perforated Cylindrical Shell in SMART

2011 ◽  
Author(s):  
Youngin Choi ◽  
Seungho Lim ◽  
Kyoung-Su Park ◽  
No-Cheol Park ◽  
Young-Pil Park ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Characteristics ◽  
Natural Frequencies ◽  
Element Model ◽  
Mode Shapes ◽  
Steam Generators ◽  
Structure Interaction ◽  
The Finite Element Model ◽  
Reactor Internals

The System-integrated Modular Advanced ReacTor (SMART) developed by KAERI includes components like a core, steam generators, coolant pumps, and a pressurizer inside the reactor vessel. Though the integrated structure improves the safety of the reactor, it can be excited by an earthquake and pump pulsations. It is important to identify dynamic characteristics of the reactor internals considering fluid-structure interaction caused by inner coolant for preventing damage from the excitations. Thus, the finite element model is constructed to identify dynamic characteristics and natural frequencies and mode shapes are extracted from this finite element model.

scholarly journals Analysis of dynamic characteristics of climbing formwork under wind loads

2019 ◽  
Vol 79 ◽  
pp. 01016
Author(s):  
Shicheng Hu ◽  
Jun Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Characteristics ◽  
Calculation Method ◽  
Design Method ◽  
Element Model ◽  
Wind Load ◽  
Bending Effect ◽  
Matlab Programming ◽  
The Finite Element Model

This article took the climbing formwork which constructed on the bridge at a height of 100 meters as the prototype, then established the finite element model and conducted modal analysis. The APDL language is used to load the wind load which is simulated by the Matlab programming then calculated the displacement and acceleration responses of the climbing formwork and further. The results show that the bending effect of the climbing formwork is more obvious. This calculation method of calculating the wind load, improve the anti-wind design method of the climbing formwork.

Modal Analysis of BT Spindle-Toolholder Interface Based on Abaqus/Standard

2013 ◽  
Vol 662 ◽  
pp. 632-636
Author(s):  
Yong Sheng Zhao ◽  
Jing Yang ◽  
Xiao Lei Song ◽  
Zi Jun Qi
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Element Model ◽  
Contact Theory ◽  
High Speed Machining ◽  
The Finite Element Model

The quality of high speed machining is directly related to dynamic characteristics of spindle-toolholder interface. The paper established normal and tangential interactions of BT spindle-toolholder interface based on finite element contact theory, and analysed free modal in Abaqus/Standard. Then the result was compared with the experimental modal analysis. It shows that the finite element model is effective and could be applied in the future dynamic study of high-speed spindle system.

The effect of a localized fault in the planet bearing on vibrations of a planetary gear set

2018 ◽  
Vol 53 (5) ◽  
pp. 313-323 ◽  
Author(s):  
Jing Liu ◽  
Yajun Xu ◽  
Yimin Shao ◽  
Huifang Xiao ◽  
Hongwu Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Characteristics ◽  
Rotational Velocity ◽  
Planetary Gear ◽  
Element Model ◽  
Previous Method ◽  
Outer Race ◽  
Velocity Moment ◽  
The Finite Element Model

Dynamic characteristics of a planetary gear set can be greatly affected by a localized fault in the planet bearing. To understand the relationship between the dynamic characteristic of the planetary gear set and the localized fault sizes, a dynamic finite element model for a planetary gear set is developed. A localized fault is assumed to be located in the outer race of the planet bearing. The fault profile is defined as a rectangular one. To formulate the elastic deformations of the components and elastic contact deformations between the mating components, all components of the planetary gear set are considered as elastic bodies in the finite element model. A standard gravity is also considered in the finite element model. A Coulomb frictional model is used to formulate the frictional forces in the planetary gear set. Influences of the rotational velocity, moment, and fault width on the dynamic characteristics of the planetary gear set are discussed. The simulation results are compared with those from the previous method to validate the finite element model. It seems that the presented finite element model can be applied to simulate the dynamic characteristics of a planetary gear set caused by a localized fault in the outer race of the planet bearing.

Modal Analysis and Experimental Analysis of Dynamic Characteristics of Linear Rolling Guide

2012 ◽  
Vol 482-484 ◽  
pp. 2360-2364
Author(s):  
Xiao Peng Li ◽  
Hao Guo ◽  
Jing Nian Liu ◽  
Ya Li Liu
Keyword(s):  
Finite Element ◽  
Boundary Conditions ◽  
Finite Element Model ◽  
Experimental Analysis ◽  
Dynamic Performance ◽  
Element Model ◽  
Cnc Machine ◽  
Element Analysis ◽  
Rolling Guide ◽  
The Finite Element Model

The finite element model of the liner rolling guide of the CNC machine tool is established. Then the natural frequencies and the corresponding vibration modes of the liner rolling guide (LRG) are obtained by analyzing the finite element model (FEM) of the linear rolling guide in two different boundary conditions. By comparing the modal characters of the two states it is proved that the movable joint and bolted interfaces of the rail have certain effects on the dynamic performance of linear rolling guide. Besides, the liner rolling guide also have been tested dynamically, obtaining the modal parameters of the rail guide; finally, the validity of finite element model and the effect of boundary conditions on the interface of the linear rolling guide are verified by comparing the finite element analysis of frequency and experimental analysis of frequency

Finite element modeling of interaction between non-pneumatic mechanical elastic wheel and soil

2019 ◽  
Vol 233 (13) ◽  
pp. 3293-3304 ◽  
Author(s):  
Yao-Ji Deng ◽  
You-Qun Zhao ◽  
Han Xu ◽  
Ming-Min Zhu ◽  
Zhen Xiao
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Static Loading ◽  
Soil Compaction ◽  
Great Influence ◽  
Element Model ◽  
Layer System ◽  
Elastic Wheel ◽  
Mechanical Elastic Wheel ◽  
The Finite Element Model

The tire/soil interaction is an important and complex research topic in vehicle-terrain mechanics, which has a great influence on vehicle mobility and soil compaction. The purpose of this work was to develop a detailed nonlinear finite element model for parametric analysis of the interaction between mechanical elastic wheel and the soil. The three-dimensional finite element model of the mechanical elastic wheel, which considers material nonlinearity, geometric nonlinearity, as well as large contact deformation between the mechanical elastic wheel and soil, was developed based on the physical model. The reliability and accuracy of the finite element model were validated by comparing the predicted wheel static loading characteristics in rigid plane with those of experiments. The finite element model of the soil is modeled as a two-layer system and the Extended Drucker–Prager model was used to describe the nature soil properties. The deformation and stress of the soil and mechanical elastic wheel under the static loading condition were studied in detail. Moreover, the effects of the axial load on mechanical elastic wheel/soil interaction were also analyzed. The research results could offer reference for an optimum structural design of a mechanical elastic wheel and a prediction of soil compaction caused by non-pneumatic tires.

Influence of External Tendons on Dynamic Characteristics of Box Girder with Corrugated Steel Webs

2010 ◽  
Vol 163-167 ◽  
pp. 2131-2136 ◽  
Author(s):  
Jian Bo Chen ◽  
Bao Dong Liu ◽  
Peng Fei Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Element Model ◽  
Box Girder ◽  
External Tendons ◽  
The Impact ◽  
The Finite Element Model

Based on Miyamoto’s method, the natural frequency of prestressed box girder with corrugated steel webs considering the impact of external tendons was obtained. And the result was modified based on the finite element model. It shows that: the external tendons will reduce the natural frequency of bridge with reduced range of about 3%. Beneficial references were provided to the layout of external tendons in order to avoid the resonance between the box girder with corrugated steel webs and the external tendons.

Dynamic Analysis of Cross Simulator

2011 ◽  
Vol 52-54 ◽  
pp. 1698-1702
Author(s):  
Xu Dong Yang ◽  
Liang Liang Jin ◽  
Jia Chun Li ◽  
Zhi Qiang Jin ◽  
Jin Zhao
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Analysis ◽  
Static Analysis ◽  
Dynamic Characteristics ◽  
Impact Load ◽  
Element Model ◽  
Explicit Method ◽  
Set Up ◽  
The Finite Element Model

The finite element model of cross simulator including supporting structure, beam, etc. was set up in the environment of ABAQUS. After the static analysis which meets the requirements, the model’s dynamic characteristics when bearing impact load was obtained using explicit method according to modal analysis results. Comparing different analysis results with technical index, it indicates that larger impact load makes the dynamic characteristics worse significantly.

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