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.

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.

scholarly journals Finite Element Analysis of Ball Burnishing on Ball-End Milled Surfaces Considering Their Original Topology and Residual Stress

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 638 ◽  
Author(s):  
Cyrus Amini ◽  
Ramón Jerez-Mesa ◽  
J. Antonio Travieso-Rodriguez ◽  
Jordi Llumà ◽  
Aida Estevez-Urra
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Coefficient Of Friction ◽  
Surface Integrity ◽  
Finite Element Models ◽  
Real Surface ◽  
Ball Burnishing ◽  
Surface Geometry ◽  
Topological Features ◽  
The Coefficient Of Friction

Ball burnishing is a superfinishing operation whose objective is the enhancement of surface integrity of previously machined surfaces, hence its appropriateness to complement chip removal processes at the end of a production line. As a complex process involving plastic deformation, friction and three-dimensional interaction between solids, numerical solutions and finite element models have typically included a considerable amount of simplifications that represent the process partially. The aim of this paper is to develop a 3D numerical finite element model of the ball burnishing process including in the target workpiece real surface integrity descriptors resulting from a ball-end milled AISI 1038 surface. Specifically, its periodical topological features are used to generate the surface geometry and the residual stress tensor measured on a real workpiece is embedded in the target surface. Secondly, different models varying the effect of the coefficient of friction and the direction of application of burnishing passes with regards to the original milling direction are calculated. Results show that the resulting topology and residual stresses are independent of the burnishing direction. However, it is evident that the model outputs are highly influenced by the value of the coefficient of friction. A value of 0.15 should be implemented in order to obtain representative results through finite element models.

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.

Micro-CT based finite element models for elastic properties of glass–ceramic scaffolds

2017 ◽  
Vol 65 ◽  
pp. 248-255 ◽  
Author(s):  
Stefano Tagliabue ◽  
Erica Rossi ◽  
Francesco Baino ◽  
Chiara Vitale-Brovarone ◽  
Dario Gastaldi ◽  
...  
Keyword(s):  
Finite Element ◽  
Elastic Properties ◽  
Glass Ceramic ◽  
Finite Element Models ◽  
Micro Ct

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>

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