Using Modal Analysis to Investigate the Validity of Finite Element Models for Simulating the Thermostamping of Woven-Fabric Reinforced Composites

2010 ◽  
Vol 3 (S1) ◽  
pp. 687-690 ◽  
Author(s):  
J. Sherwood ◽  
K. Fetfatsidis ◽  
D. Winchester ◽  
D. Jauffrès ◽  
P. Avitabile ◽  
...  
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Woven Fabric ◽  
Finite Element Models ◽  
Reinforced Composites

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.

Strains and Deflections of GFRP Sandwich Panels Due to Uniform Out-of-Plane Pressure

2002 ◽  
Vol 39 (04) ◽  
pp. 223-231
Author(s):  
J. C. Roberts ◽  
M. P. Boyle ◽  
P. D. Wienhold ◽  
E. E. Ward
Keyword(s):  
Finite Element ◽  
Compressive Strain ◽  
Sandwich Panels ◽  
External Pressure ◽  
Woven Fabric ◽  
Core Material ◽  
Finite Element Models ◽  
Strain Gages ◽  
Glass Fiber Reinforced Plastic ◽  
Out Of Plane

Rectangular orthotropic glass fiber reinforced plastic sandwich panels were tested under uniform out-of-plane pressure and the strains and deflections were compared with those from finite-element models of the panels. The panels, with 0.32 cm (0.125 in.) face sheets and a 1.27 cm (0.5 in.)core of either balsa or linear polyvinylchloride foam, were tested in two sizes: 183 × 92 cm (72 × 36 in.) and121 × 92 cm (48 × 36 in.). The sandwich panels were fabricated using the vacuum-assisted resin transfer molding technique. The two short edges of the sandwich panels were clamped, while the two long edges were simply supported. Uniform external pressure was applied using two large water inflatable bladders in series. The deflection and strains were measured using dial gages and strain gages placed at quarter and half points on the surface of the panels. Measurements were made up to a maximum out-of-plane pressure of 0.1 MPa (15psi). A total of six balsa core and six foam core panels were tested. Finite-element models were constructed for the 183-cm-long panel and the121-cm-long panel. Correlation between numerical and experimental strains to deflect the sandwich panel was much better on the top (tensile) side of the panels than on the bottom (compressive)side of the panels, regardless of panel aspect ratio or core material. All sandwich panels exhibited the same compressive strain reversal behavior on the compressive side of the panel. This phenomenon was thought to be due to nonlinearly induced micro-buckling under the strain gages, buckling of the woven fabric, or micro-cracking within the resin.

3D Finite Element Modeling for Particle-Reinforced Polymer Composites for Wind Energy Application

2011 ◽  
Vol 189-193 ◽  
pp. 2177-2180 ◽  
Author(s):  
Huai Wen Wang ◽  
Hong Wei Ji ◽  
Wen Quan Shao ◽  
Hui Miao
Keyword(s):  
Finite Element ◽  
Finite Element Models ◽  
Reinforced Composites ◽  
Random Parameters ◽  
Development Environment ◽  
Microstructural Parameters ◽  
Reinforced Polymer ◽  
Mechanical Models ◽  
Energy Application ◽  
Properties Of Composites

A series of numerical meso-mechanical models for different kinds of particle (include spherical, cylindrical and discal) reinforced composites are developed to investigate the effect of microstructural parameters on the elastic properties of composites. In these models, an effective interface concept is adopted. Finite element models with prescribed and random parameters are automatically generated in ABAQUS PDE (Python Development Environment). In the simulative investigations, it is observed that the degree of particle clustering and particle’s shape have strong effects on the elastic mechanical properties of composites.

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.  

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