Updating of Finite Element Models for Controlled Multibody Flexible Systems Through Modal Analysis

2019 ◽  
pp. 264-271 ◽  
Author(s):  
Dario Richiedei ◽  
Alberto Trevisani
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Finite Element Models ◽  
Flexible Systems

Dynamics Analysis of Refrigeration Compressor Based on Finite Element and Experimental Modes

2012 ◽  
Vol 499 ◽  
pp. 238-242
Author(s):  
Li Zhang ◽  
Hong Wu ◽  
Yan Jue Gong ◽  
Shuo Zhang
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Modal Analysis ◽  
Natural Frequency ◽  
High Precision ◽  
3D Model ◽  
Finite Element Models ◽  
Dynamics Analysis ◽  
Response Characteristics ◽  
Dynamic Response Characteristics

Based on the 3D model of refrigeration's compressor by Pro/E software, the analyses of theoretical and experimental mode are carried out in this paper. The results show that the finite element models of compressor have high precision dynamic response characteristics and the natural frequency of the compressor, based on experimental modal analysis, can be accurately obtained, which will contribute to further dynamic designs of mechanical structures.

An Improvement Design Research on the Structure of Precision Grinder

2012 ◽  
Vol 229-231 ◽  
pp. 526-529
Author(s):  
Rui Zhen Li ◽  
Peng Zhai ◽  
Peng Wang ◽  
Shao Peng Zhai
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Lower Order ◽  
Design Research ◽  
Weak Link ◽  
Finite Element Models ◽  
Improvement Program ◽  
Effective Measure ◽  
Structural Rigidity ◽  
Reliable Basis

To increase the lower order natural frequency of MM7140 grinder’s support parts is an effective measure to improve structural rigidity, avoid resonance and reduce amplitude. The finite element models of MM7140's lathe bed and column, were established by 3-D software UG, and led into ANSYS for modal analysis. Then, found the column was the weak link based on the modal analysis results, and brought out the more effective improvement program. This paper offers a reliable basis for the design and renovation of MM7140 grinder.

scholarly journals METHODS FOR WHEEL PAIR DYNAMICS MODELING TAKING INTO ACCOUNT ELASTICITY

2019 ◽  
Vol 2019 (4) ◽  
pp. 40-51
Author(s):  
Геннадий Михеев ◽  
Gennadiy Miheev ◽  
Дмитрий Погорелов ◽  
Dmitriy Pogorelov ◽  
Александр Родиков ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Finite Element ◽  
Modal Analysis ◽  
Finite Element Models ◽  
Moving Loads ◽  
Dynamics Modeling ◽  
Wheel Pair ◽  
First Results ◽  
Wheel Profile ◽  
Universal Mechanism

The computer simulation of railway wheel pair (WP) dynamics taking into account elasticity allows analyzing WPs highfrequency oscillations and vibroaccelerations of crew part units connected with them, modeling strain gage wheel pairs, estimating the WP deformation impact upon force distributions in gears of locomotive drives, and also solving other ur-gent problems. In the paper there are offered two approaches to the analysis of the dynamics of elastic WPs within the limits of which their finite element models with the rotating and nonrotating grid are under consideration. The WP kinematics is presented as a sum of its motion as an absolute solid together with the jointed co-ordinates (C) and small elastic removals regarding co-ordinates given which are calculated on the basis of the results of WP modal analysis. A wheel profile kinematics is described taking into account unit elastic motions. There are presented algorithms for the calculation of generalized forces of moving loads in the wheelrail contact taking into account WP elasticity. Both approaches are realized in the “Universal mechanism” program. The first results of modeling confirming the correctness of the methods offered are shown.

scholarly journals Seismic Assessment in a Historical Masonry Minaret by Linear and Non-linear Seismic Analyses

2020 ◽  
Author(s):  
Emin Hökelekli ◽  
Ali Demir ◽  
Emre Ercan ◽  
Halil Nohutçu ◽  
Abdurrahman Karabulut
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Dynamic Properties ◽  
Ground Motions ◽  
Element Model ◽  
Operational Modal Analysis ◽  
Finite Element Models ◽  
Non Linear ◽  
Concrete Damage ◽  
Historical Masonry

Operational Modal Analysis (OMA) method is frequently used in order to determine dynamical properties of historical masonry structures. In this study, damage pattern of historical Alaca minaret which is selected as application is investigated under different ground motions by updating finite element models (FEM) depending on operational modal analysis test. Initial Finite element model was prepared in ABAQUS V10 program and numerical dynamic characteristics of minaret were determined. In addition, experimental dynamic properties of minaret were provided by operational modal analysis. Initial numerical model of brick masonry structure was calibrated via OMA method. Then, linear and non-linear seismic analyses of calibrated FEM of historical minaret were performed by using different earthquakes acceleration records that occurred in Turkey. Concrete Damage Plasticity model was taken into account in non-linear seismic analyses. As a result of the analyses, it is concluded that the stresses obtained with linear analyses aren’t as realistic as the non-linear analyses results and the earthquakes can cause some damages in the minaret.  

Finite Element Modeling and Modal Analysis of Coilable Mast

2012 ◽  
Vol 226-228 ◽  
pp. 299-302
Author(s):  
Jie Wang ◽  
Dong Xu Li ◽  
Jian Ping Jiang
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Modal Analysis ◽  
Natural Frequencies ◽  
Space Mission ◽  
Joint Model ◽  
Finite Element Models ◽  
Attached Mass ◽  
Element Modeling ◽  
Tension Level

This paper investigates the modal characteristics of a coilable mast for space mission applications. Finite element models are established for characterizing the coilable mast. The simplification of joints between longerons and batten frames and the pre-tension in cables are carefully considered. A parametric modal analysis is performed with considering the following factors, the joint model in the truss, the pre-tension in cables, elements selected for longerons and battens, the mass attached to the top of the mast. Research results show that the natural frequencies of the coilable mast are sensitive to the selected elements and the attached mass. The pre-tension level in cables and the precision degree of the joint model have little effect on natural frequencies. The regularity expressed in the parametric modal analysis is useful for designers and engineers.

Modal Analysis of Magnetic Suspended Control Moment Gyroscope

2011 ◽  
Vol 50-51 ◽  
pp. 59-62
Author(s):  
Wei Zhao ◽  
Li Bin Zhao ◽  
Jian Yu Zhang ◽  
Bang Cheng Han
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Finite Element Models ◽  
Analysis Software ◽  
Element Analysis ◽  
3D Finite Element ◽  
Control Moment Gyroscope ◽  
Control Moment ◽  
Numerical Predictions ◽  
Analysis Scheme

3D finite element models of magnetic suspended control moment gyroscope structure are established by general finite element analysis software. Initial modal analysis scheme of the MS-CMG structure, in which the frame and gyro-chamber are analyzed separately, is described. A new modal analysis scheme that the MS-CMG is analyzed as a whole structure is presented. The connection between the gyro-chamber and frame is realized by defining a revolution pairs. The numerical predictions from two modal analysis schemes show obvious difference. The new scheme is more reliable since it simulates the real wok status of MS-CMG.

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