scholarly journals Research on Vibration Characteristics of Typical Pipe

2018 ◽  
Vol 198 ◽  
pp. 02001
Author(s):  
Shaoming Yu ◽  
Tian Lu ◽  
Guo Wei ◽  
Yanping Hu
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Finite Element Simulation ◽  
Vibration Characteristics ◽  
Test Method ◽  
Element Simulation ◽  
Ground Test ◽  
The Difference ◽  
Theoretical Results ◽  
Pipe Vibration

Through the study on the vibration characteristics of the typical pipe, it tries to provide the basis for the pipe design and the pipe ground test method. A typical pipe is selected. First, modal analysis is carried out through theoretical analysis and finite element simulation. Then, pipe vibration is studied by finite element simulation and test. The results show that the theoretical results in modal analysis coincide well with those in finite element simulation. The finite element simulation and experimental results are basically consistent in vibration analysis. The reason for the difference is mainly the ideal boundary of simulation. The combination of finite element simulation and test is an important method for the research of pipe reliability and environmental adaptability.

scholarly journals Effect of the Supports’ Positions on the Vibration Characteristics of a Flexible Rotor Shafting

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Miaomiao Li ◽  
Zhuo Li ◽  
Liangliang Ma ◽  
Rupeng Zhu ◽  
Xizhi Ma
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Vibration Characteristics ◽  
Rotor System ◽  
Experimental Investigations ◽  
Flexible Rotor ◽  
Bending Vibration ◽  
First Order ◽  
Element Simulation

In this study, we evaluated the effect of changing supports’ position on the vibration characteristics of a three-support flexible rotor shafting. This dependency was first analyzed using a finite element simulation and then backed up with experimental investigations. By computing a simplified rotor shafting model, we found that the first-order bending vibration in a forward whirl mode is the most relevant deforming mode. Hence, the effect of the supports’ positions on this vibration was intensively investigated using simulations and verified experimentally with a house-made shafting rotor system. The results demonstrated that the interaction between different supports can influence the overall vibration deformation and that the position of the support closer to the rotor has the greatest influence.

Numerical simulation of ductile fracture in polyethylene pipe with continuum damage mechanics and Gurson-Tvergaard-Needleman damage models

2019 ◽  
Vol 233 (12) ◽  
pp. 2455-2468
Author(s):  
Yi Zhang ◽  
P-Y Ben Jar ◽  
Shifeng Xue ◽  
Lin Li
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Constitutive Equations ◽  
Damage Evolution ◽  
Damage Mechanics ◽  
Experimental Testing ◽  
Monotonic Loading ◽  
Test Method ◽  
Strain Level ◽  
Element Simulation

A phenomenon-based hybrid approach of experimental testing and finite element simulations is used to describe the fracture behavior of pipe-grade polyethylene. The experimental testing adopts a modified D-split test method to stretch the pipe ring (notched pipe ring) specimens that have symmetric, double-edged flat notches along the pipe direction. Two series of experimental testing were conducted: (1) monotonic loading till fracture and (2) monotonic loading to a predefined strain level, keeping constant displacement for a period of time, and then unloaded. Crosshead speeds of 0.01, 1, and 100 mm/min were used in both series of tests. Likewise, two series of finite element simulation were conducted to establish the constitutive equations, either with or without considering damage evolution during the deformation process. The constitutive equation without the consideration of damage was established using results from the first series of experimental testing, and that with damage was inspired from the second series which showed the decrease in unloading modulus with the increase of crosshead speed or the predefined strain level. The results show that with the consideration of damage evolution, the constitutive equations enable the finite element simulation to determine the whole stress–strain relationship during both necking and fracture processes.

Prediction of Hardness in Drawn Copper Wire by Effective Strain from Finite Element Simulation

2019 ◽  
Vol 947 ◽  
pp. 103-108
Author(s):  
Chao Cheng Chang ◽  
Yen Ta Hsieh ◽  
Chun Hsuan Kao ◽  
Shun Yu Shao ◽  
Chia Hao Hsu
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Copper Wire ◽  
Wire Drawing ◽  
Reference Curve ◽  
Element Simulation ◽  
The Wire ◽  
The Difference ◽  
Drawing Dies ◽  
Hardness Values

The study developed a hardness-strain reference curve to be used with the finite element simulation for the prediction of the hardness in the drawn copper wire. The hardness values of the deformed copper specimens from tensile tests were analyzed to construct a relationship between hardness and strain. By using an industrial wire drawing machine, a copper wire was drawn by 5 passes to reduce its diameter from 8 to 4.64 mm. All drawing dies used the same configurations which include an area reduction ratio of 20 percent, an approach angle of 7°, and a bearing length of 0.5 times the feeding wire diameter. The finite element simulations of the wire drawing processes were also performed to predict the effective strains in the drawn copper wires. With the use of the developed hardness-strain curve, the hardness of the drawn wires can be estimated. The results show that the difference between the predicted and measured hardness values is about 10 percent lower in the early stage of the wire drawing process, and the difference increases with the number of passes to about 30 percent higher in the later stage of the process.

scholarly journals Modal Analysis of Cracked Cantilever Beam by Finite Element Simulation

2017 ◽  
Vol 194 ◽  
pp. 509-516 ◽  
Author(s):  
Md. Shumon Mia ◽  
Md. Shahidul Islam ◽  
Udayan Ghosh
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Finite Element Simulation ◽  
Cantilever Beam ◽  
Element Simulation

The Vibration Characteristics Analysis of U-Shaped Pipe Based on Finite Element and Modal Experiment

2013 ◽  
Vol 427-429 ◽  
pp. 53-56
Author(s):  
Li Zhang ◽  
Ye Tian ◽  
Yan Miao Ma
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Element Model ◽  
Vibration Characteristics ◽  
Experimental Modal Analysis ◽  
Piping System ◽  
Characteristics Analysis ◽  
The Finite Element Model ◽  
Pipe Vibration

The U-shaped pipe located in the compressor piping system of the lyophilizer is studied in this paper. Its finite element modal analysis is carried out through the software ABAQUS, and at the same time, the experimental modal analysis is conducted by the software LMS Test.lab and its corollary equipment. Through the comparison between the finite element modal analysis results and the experimental modal results, it can be seen that the two results have good consistence, which verifies that the finite element model is reasonable. This paper provides reference for the further studies of the curving pipe vibration.

scholarly journals Magnetic Circuit Design and Finite Element Simulation Analysis of Magnetic Fluid Rotating Dynamic Sealing Device

CONVERTER ◽  
2021 ◽  
pp. 658-663
Author(s):  
Xiaojuan Li Et al.
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Circuit Design ◽  
Magnetic Fluid ◽  
Magnetic Circuit ◽  
Test Method ◽  
Element Simulation ◽  
Tooth Width ◽  
Dynamic Seal ◽  
Sealing Device

The magnetic fluid rotary dynamic sealing device is based on the magnetic fluid material. The typical sealing structure is to fill the magnetic fluid in the gap between the shaft and the magnetic pole, and keep it in the sealing gap under the action of the external magnetic field to form a liquid "O"-shaped sealing ring to block it. The sealing effect of this kind of device largely depends on the design of the magnetic circuit structure of the device. In this paper, ANSYS finite element simulation is used to analyze the influence of seal stages, tooth shape and the number of permanent magnets on the magnetic fluid rotating dynamic seal. The L9 (34) factor level table is designed by orthogonal test method to analyze the priority of the influence of tooth width, seal clearance and chamfering on the magnetic fluid sealing performance, which provides the reference for the structural design and magnetic circuit design of magnetic fluid rotating dynamic seal.

The Effect of the Secondary Dead Load on Vibration Characteristics of a Steel Box Girder Footbridge Model

2014 ◽  
Vol 1049-1050 ◽  
pp. 387-391
Author(s):  
Ju Bing Zhang ◽  
Ying Zou ◽  
Shao Xia Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Model Comparison ◽  
Vibration Characteristics ◽  
Dead Load ◽  
Element Analysis ◽  
Box Girder ◽  
Element Simulation ◽  
Before And After ◽  
Calculation Results

Making field test and finite element simulation on East Third Ring Road Xiaobawang footbridge in Beijing, considering the effect of the deck loads of the bridge on the model calculation results, we can find the effect of the secondary dead load on vibration characteristics of the footbridge model. Comparison of the frequencies of model before and after applying the secondary dead load make us know that applying dead load will lead to the lower frequency of bridge. In the process of the bridge finite element analysis, factors to consider should be more comprehensive and the way to simulation should be more realistic so that the results of finite element simulation can be closer to the actual.

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