scholarly journals A Finite Element Model and Electronic Analogue of Pipeline Pressure Transients With Frequency-Dependent Friction

2003 ◽  
Vol 125 (1) ◽  
pp. 194-198 ◽  
Author(s):  
Jian-Jun Shu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Transmission Lines ◽  
Method Of Characteristics ◽  
Space Form ◽  
Element Model ◽  
Analogue Circuit ◽  
Frequency Dependent ◽  
Fluid Transients ◽  
Basic Equations

A finite element model and its equivalent electronic analogue circuit has been developed for fluid transients in hydraulic transmission lines with laminar frequency-dependent friction. Basic equations are approximated to be a set of ordinary differential equations that can be represented in state-space form. The accuracy of the model is demonstrated by comparison with the method of characteristics.

A Finite-Element Model for Plane-Strain Plasticity

1979 ◽  
Vol 46 (3) ◽  
pp. 536-542 ◽  
Author(s):  
P. G. Hodge ◽  
H. M. van Rij
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Plane Strain ◽  
Element Model ◽  
Displacement Fields ◽  
Model Based ◽  
Strain Plasticity ◽  
Continuous Displacement ◽  
Basic Equations ◽  
Punch Problem

A finite-element model is proposed which allows for both straining within each element and slip between two elements. Basic equations are derived and are shown to almost completely uncouple into two constituent components: the conventional finite-element equations for continuous displacement fields and the “slip” equations which were recently derived for a model based on slipping of rigid triangles. The model is applied to the Prandtl punch problem and is shown to combine the best features of its two constituents.

scholarly journals A Finite Element Model for the Vibration Analysis of Sandwich Beam with Frequency-Dependent Viscoelastic Material Core

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3390 ◽  
Author(s):  
Zhicheng Huang ◽  
Xingguo Wang ◽  
Nanxing Wu ◽  
Fulei Chu ◽  
Jing Luo
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Viscoelastic Material ◽  
Vibration Analysis ◽  
Sandwich Beam ◽  
Element Model ◽  
Finite Model ◽  
Vibration Modes ◽  
Frequency Dependent ◽  
Biot Model

In this work, a finite element model was developed for vibration analysis of sandwich beam with a viscoelastic material core sandwiched between two elastic layers. The frequency-dependent viscoelastic dynamics of the sandwich beam were investigated by using finite element analysis and experimental validation. The stiffness and damping of the viscoelastic material core is frequency-dependent, which results in complex vibration modes of the sandwich beam system. A third order seven parameter Biot model was used to describe the frequency-dependent viscoelastic behavior, which was then incorporated with the finite elements of the sandwich beam. Considering the parameters identification, a strategy to determine the parameters of the Biot model has been outlined, and the curve fitting results closely follow the experiment. With identified model parameters, numerical simulations were carried out to predict the vibration and damping behavior in the first three vibration modes, and the results showed that the finite model presented here had good accuracy and efficiency in the specific frequency range of interest. The experimental testing on the viscoelastic sandwich beam validated the numerical predication. The experimental results also showed that the finite element modeling method of sandwich beams that was proposed was correct, simple and effective.

Development and application of numerical simulation and experiment for studying the compressive forming technology of transmission lines

2020 ◽  
Vol 234 (11) ◽  
pp. 1399-1408
Author(s):  
Zhongfei Ye ◽  
Chuan Wu ◽  
Yifan Xia ◽  
Xiangjun Chen
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Grip Strength ◽  
Transmission Lines ◽  
Element Model ◽  
Process Window ◽  
Forming Process ◽  
Dynamic Finite Element ◽  
Forming Technology ◽  
Designed Experiment

In this paper, an explicit dynamic finite element model is built to study the compressive forming technology used in the metal connector of transmission lines of power system. Additionally, to improve the calculation accuracy, an optimized reversed calculation method for determining the equivalent friction coefficients is designed and coupled into the dynamic finite element model. It is validated with a carefully designed experiment that the coupled dynamic finite element model is effective in describing the plastic flow and in determining the grip strength of the compressive forming structure. Finally, with the dynamic finite element model, an optimized compressive forming process window is obtained for controlling the formation of edge flaws while keeping sufficient grip strength.

scholarly journals Numerical Modeling and Control of Rotating Plate with Coupled Self-Sensing and Frequency-Dependent Active Constrained Layer Damping

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Zhengchao Xie ◽  
Pak Kin Wong ◽  
Long Zhang ◽  
Hang Cheong Wong
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Frequency Domain ◽  
Viscoelastic Material ◽  
Element Model ◽  
Constrained Layer Damping ◽  
Frequency Dependent ◽  
Frequency Dependency ◽  
Active Constrained Layer ◽  
Rotating Plate

This work proposes a coupled finite element model for actively controlled constrained layer damped (CLD) rotating plate with self-sensing technique and frequency-dependent material property in both the time and frequency domain analyses. Constrained layer damping with viscoelastic material can effectively reduce the vibration in rotating structures. However, most existing research models use complex modulus approach to model the viscoelastic material, but it limits to frequency domain analysis and the frequency dependency of the viscoelastic material is not well-included as well. It is meaningful use of the anelastic displacement fields (ADFs) that is done in order to include the frequency dependency of the material for both the time and frequency domains. Also, unlike previous ones, all types of damping are taken into account by this finite element model. Thus, in this work, a single layer finite element is adopted to model a three-layer active constrained layer damped rotating plate in which the constraining layer is made of piezoelectric material to work as both the self-sensing sensor and actuator. This newly proposed finite element model is validated, and then, as shown in numerical studies, this proposed approach can achieve effective vibration reduction in both the frequency and time domains.

Finite Element Simulation of Tire-Rim Interface

1989 ◽  
Vol 17 (4) ◽  
pp. 305-325 ◽  
Author(s):  
N. T. Tseng ◽  
R. G. Pelle ◽  
J. P. Chang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Finite Element Simulation ◽  
Contact Pressure ◽  
Element Model ◽  
Experimental Measurements ◽  
Inflation Pressure ◽  
Interference Fit ◽  
Element Simulation ◽  
Rubber Composite

Abstract A finite element model was developed to simulate the tire-rim interface. Elastomers were modeled by nonlinear incompressible elements, whereas plies were simulated by cord-rubber composite elements. Gap elements were used to simulate the opening between tire and rim at zero inflation pressure. This opening closed when the inflation pressure was increased gradually. The predicted distribution of contact pressure at the tire-rim interface agreed very well with the available experimental measurements. Several variations of the tire-rim interference fit were analyzed.

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