20516 Development of a Faster and More Accurate Model Modification Method for Dynamic Characteristics Prediction of Large Finite Element Models

2006 ◽  
Vol 2006.12 (0) ◽  
pp. 255-256
Author(s):  
Kenji Yamazaki ◽  
Ichiro HAGIWARA
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Finite Element Models ◽  
Accurate Model ◽  
Model Modification ◽  
Modification Method

Identifying Real Stiffness Properties of Structural Elements of Adapted Finite-Element Models of Buildings and Structures - Part 1: Problem Setting

2014 ◽  
Vol 670-671 ◽  
pp. 732-735 ◽  
Author(s):  
Pavel I. Novikov
Keyword(s):  
Finite Element ◽  
Mathematical Models ◽  
Dynamic Characteristics ◽  
Finite Element Models ◽  
Structural Elements ◽  
Reliable Analysis ◽  
Adaptive Procedures ◽  
Stiffness Properties ◽  
The Creation ◽  
Problem Setting

The distinctive paper is devoted to problem of identification the dynamic characteristics of mathematical models based on the measured dynamic characteristics of real constructions. It is describes a problem of discrepancy of measured and modeling eigen pairs. It is shown that the problem is systemic. The creation and verification processes of mathematical (finite element) models used in the design constructions need some work and adjustments. For a reliable analysis of the construction ways are suggested to overcome the identified gaps using adaptive procedures.

Research on Increasing Hob Tip Fillet Radius to Decrease Addendum Modification Coefficient

2012 ◽  
Vol 271-272 ◽  
pp. 1105-1109
Author(s):  
Xiang Fei Zhao ◽  
Yu Lin ◽  
Hong Qi Liu ◽  
Jie Zhang
Keyword(s):  
Finite Element ◽  
Virtual Environment ◽  
Bending Strength ◽  
Parametric Design ◽  
Finite Element Models ◽  
Contact Ratio ◽  
Design Language ◽  
Fillet Radius ◽  
Modification Method ◽  
Ansys Parametric Design Language

Reasonable design of hob tip fillet and calculation of modification coefficients were researched to avoid undercutting in this paper. The undercut gears were generated in the virtual environment based on Pro / E software. Meanwhile, parametric finite element models of undercut gear, ordinary modified gear generated by standard hob and modified gear generated by hob with tip fillet radius increased,were founded by APDL (ANSYS Parametric Design Language).The results show that the minimum modification coefficients chosen to avoid undercutting by traditional modification method may not meet the requirements of contact ratio or addendum thickness.While through reasonable design of hob tip fillet, modification coefficients calculated not only avoid undercutting to improve the tooth bending strength but also meet the requirements of contact ratio ε>1.2 and addendum thickness δ>0.25m (module) .

scholarly journals ASSESSMENT OF CONSIDERATION INFLUENCE OF ELASTIC PROPERTIES IN ROAD-TRAIN SUSPENSION UPON DYNAMIC CHARACTERISTICS OF FLAT-CAR FOR PIGGYBACK TRANSPORTATIONS

2016 ◽  
Vol 2016 (4) ◽  
pp. 179-185 ◽  
Author(s):  
Марина Мануева ◽  
Marina Manueva ◽  
Дмитрий Антипин ◽  
Dmitriy Antipin ◽  
Владимир Кобищанов ◽  
...  
Keyword(s):  
Finite Element ◽  
Elastic Properties ◽  
Dynamic Characteristics ◽  
Finite Element Models ◽  
Real Surface ◽  
Software Complex

The assessment of consideration influence of elastic-dissipative properties in a road-train located upon a flat-car for piggyback transportations at the motion on real surface road imperfections is carried out. The assessment of dynamic characteristics in a flat-car frame is carried out on the basis of finite-element models with the use of “Universal Mecha-nism” software complex.

Analysis on Mechanical Characteristics of Flexible Membranous Disc Coupling

2013 ◽  
Vol 655-657 ◽  
pp. 506-510
Author(s):  
Shang Yang ◽  
Hui Qun Yuan ◽  
Yan Li
Keyword(s):  
Finite Element ◽  
Working Conditions ◽  
Dynamic Characteristics ◽  
Mechanical Characteristics ◽  
Finite Element Models ◽  
Stress Variation ◽  
3D Finite Element ◽  
Harmonic Response ◽  
Design Requirements ◽  
Element Theory

Using the basic finite element theory, 3D finite element models of flexible membranous disc coupling with different disc thickness is built by ANSYS ，and then the dynamic characteristics are analyzed in working conditions. In particular, the analysis of static stress and harmonic response to the thickness of 0.85 model is done for getting the stress variation under a rated condition. The date calculated by dynamic characteristics and stress analysis can satisfy the design requirements. Those researches and analysis provide a theoretical consideration for complex vibration situation of flexible membranous disc coupling and for the improvement and optimization of coupling product.

PREDICTION OF DYNAMIC CHARACTERISTICS USING UPDATED FINITE ELEMENT MODELS

2002 ◽  
Vol 254 (3) ◽  
pp. 447-467 ◽  
Author(s):  
S.V. MODAK ◽  
T.K. KUNDRA ◽  
B.C. NAKRA
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Finite Element Models

scholarly journals Study on Modal Dynamic Response and Hydrodynamic Added Mass of Water-Surrounded Hollow Bridge Pier with Pile Foundation

2019 ◽  
Vol 2019 ◽  
pp. 1-23 ◽  
Author(s):  
Yulin Deng ◽  
Qingkang Guo ◽  
Yasir Ibrahim Shah ◽  
Lueqin Xu
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Dynamic Characteristics ◽  
Pile Foundation ◽  
Fluid Structure Interaction ◽  
Added Mass ◽  
Bridge Pier ◽  
Finite Element Models ◽  
Fluid Structure ◽  
Structure Interaction

This article presents an experiment program conducted to study the modal dynamic response of hollow bridge pier with pile foundation submerged in water. The forced vibration method was applied on a specimen designated with four levels of tip mass; and the dynamic characteristics of the first four lateral vibration modes of the specimen, including the first two modes along the x-axis and the first two modes along the y-axis, were tested for three different cases where the specimen contacts with only outer water, only inner water, and both outer and inner water, respectively. Finite element models were established using potential-based fluid elements in accordance with the three different cases. The effects of fluid-structure interaction on the dynamic characteristics of the first four lateral modes of the specimen were then investigated through numerical simulations, and the finite element models were verified by validating numerical results against the experimental data. Based on the verified models, hydrodynamic added mass (HAM) and modal hydrodynamic added mass (MHAM) along the x-axis and y-axis of the specimen, induced by fluid-structure interaction, were studied with respect to the three cases. According to the distribution of modal acceleration and hydrodynamic pressure along the pier body, hydrodynamic added mass (HAM) distribution along the pier body was analyzed, and a simplified analytical model which equals the original fluid-structure numerical model was proposed to determine the dynamic characteristics of hollow bridge piers submerged in water. The research provides a better understanding of the effect of fluid-structure interaction on the modal dynamic response of deep-water bridges with hollow piers.

Effects of Median Strip Connecting Twin Bridges on Dynamic Performance

2019 ◽  
Author(s):  
Haoyan Wu ◽  
Ye Xia ◽  
Xin Yi ◽  
Pingkuan Sun
Keyword(s):  
Experimental Study ◽  
Finite Element ◽  
Dynamic Characteristics ◽  
Rational Design ◽  
Dynamic Performance ◽  
Structural Performance ◽  
Finite Element Models ◽  
The Future ◽  
The Relationship

<p>The median strip connecting twin bridges has effects on the rigidity and dynamic characteristics of the bridges, but the effects are usually ignored, resulting in unexpected dynamic performance or even structural resonance. In this paper, the mechanism of median strips as a connection role between twin bridges is analyzed. Finite element models of the twin bridges and median strip are developed to analysis the effects on the overall system. Experimental study of typical twin bridges with a median strip was conducted to explore the relationship between the median strip and the vibration. Based on these analyses, recommendations related to overall structural performance are made to ensure a safe and rational design for twin bridges with median strip especially on dynamic performance in the future.</p>

Dynamic characteristics analysis of a dual-rotor system with inter-shaft bearing

2017 ◽  
Vol 233 (3) ◽  
pp. 1147-1158 ◽  
Author(s):  
Nanfei Wang ◽  
Dongxiang Jiang ◽  
Hongzhi Xu
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Critical Speed ◽  
Rotor System ◽  
Operating Conditions ◽  
Type Model ◽  
Finite Element Models ◽  
Three Dimension ◽  
Critical Speeds ◽  
Characteristics Analysis

The dual-rotor structure is susceptible to vibration, causing the malfunction of the entire operating system. In order to avoid the resonance during operation, it is significant and necessary to conduct modal analysis of such rotors. The dynamic analysis of the full dual-rotor system under operating conditions is also necessary to study dynamic characteristics of the rotating system. In this paper, one-dimension Timoshenko beam-type model, including the effects of gyroscopic moments, rotary inertias, bending and shear deformations, and three-dimension model for dual-rotor system with inter-shaft bearing are developed. Critical speed tests of dual-rotor are carried out to verify the analytical results. Based on the finite element models, the first critical speed excited by inner rotor and the first two critical speeds excited by outer rotor are calculated. The comparisons between both finite element models indicate that 1D model costs less time, which can be used to predict the critical speeds. Good agreement between the theoretical and experimental results shows the accuracy of the FE models. The Campbell diagram, critical speeds, operational deflection shapes and unbalance response of the dual-rotor are obtained to fully study the dynamic characteristics of the dual-rotor system.

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