scholarly journals Research on the Influence of Vibrations on the Dynamic Characteristics of AC Contactors Based on Energy Analysis

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 559
Author(s):  
Shuguang Sun ◽  
Jingrui Cui ◽  
Taihang Du
Keyword(s):  
Dynamic Response ◽  
Dynamic Characteristics ◽  
Energy Analysis ◽  
Harmonic Oscillation ◽  
Electrical Energy ◽  
Distribution Model ◽  
Iron Core ◽  
Analysis Model ◽  
Response Characteristics ◽  
The Impact

Aimed at the influence of the vibration environment on the performance degradation of AC contactors, the purpose of this study is to investigate the failure mechanism of AC contactors under vibration conditions. During the closing process of AC contactors, the impact energy of the iron core may change due to the vibration stress, which may have an uncertain effect on the parameters of the dynamic response characteristics of the contact, and affect the working performance and service life of AC contactors. In this paper, a double-E AC contactor is selected as the research object. Based on the calculation of the transient magnetic field of the electromagnetic mechanism, an energy distribution model of the AC contactor is established. Based on this, considering the influence of vibrations and the input electrical energy under different closing phase angles, the energy model of the iron core collision under simple harmonic oscillation is investigated. The steady-state vibration energy at different frequencies and accelerations is calculated, and its influence on the dynamic response parameters of the AC contactor is analyzed. Finally, the simulation model is verified by experimental data. The results show that the energy analysis model can effectively reflect and explain the uncertainty of the dynamic characteristics of AC contactors under vibrations, from the perspective of the mechanism.

scholarly journals Dynamic Response of Seismic Dangerous Rock Based on PFC and Dynamics

2020 ◽  
Vol 2020 ◽  
pp. 1-19
Author(s):  
Yun Tian ◽  
Linfeng Wang ◽  
Honghua Jin ◽  
Biao Zeng
Keyword(s):  
Dynamic Response ◽  
Low Frequency ◽  
Peak Stress ◽  
Slope Instability ◽  
Dynamic Responses ◽  
Distribution Model ◽  
Distribution Models ◽  
Response Characteristics ◽  
Crack Propagation Process ◽  
The Impact

Rock slope instability by earthquakes results in substantial economic and property losses. The calculation method of interlayer load and stability coefficient of horizontal complex layered rock slopes in high-intensity areas is established from material mechanics, fracture mechanics, and dynamics. The stability of horizontal layered dangerous rock is calculated after combining it with PFC simulation technology to verify the rationality of the calculation in the Wenchuan area of Sichuan Province. The dynamic response characteristics of dangerous rocks under different weathering degrees are also analyzed. The results show that both methods have an excellent early warning effect on earthquake dangerous rocks. Among the PGA amplification factors, Model 1 has a relatively uniform distribution, Model 2 has a zigzag distribution, Models 3 and 4 have a “U”-shaped distribution, and the most severe acceleration dynamic responses are 4-1 and 4-2 rock blocks. The dynamic acceleration response of mudstone is affected by the crack propagation process of the upper sandstone and exhibits a particular elevation amplification effect. The peak stress gradually decreases with the increase in weathering and elevation. The stress change of the inner chain No. 2 in the horizontal x and y directions is severe, and the stress response of the outer chain No. 1 in the vertical z-direction is severe. It recommends that earthquake disaster protection projects should pay attention to the impact of low-frequency (0–10 Hz) and high-frequency (250 Hz) earthquakes on slope stability.

The Dynamic Response of Zhengyangmen Gate Tower Induced by Beijing Metro Line 2

2014 ◽  
Vol 580-583 ◽  
pp. 1212-1217
Author(s):  
Qi Song ◽  
Jia Qi Guo ◽  
Wen Hua Chen ◽  
Ping Guo
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Test Data ◽  
Vibration Test ◽  
Analysis Model ◽  
Response Characteristics ◽  
The North ◽  
Cultural Relic ◽  
Dynamic Response Characteristics ◽  
South Axis

Zhengyangmen gate tower is a national emphasis cultural relic unit along the north-south axis of Beijing, which is above the Beijing metro line 2. Based on dynamic analysis model of gate tower and the position of gate tower and subway, the dynamic response characteristics of gate tower induced by Beijing metro line 2 are calculated, and compared with the in-site vibration test data.

Dynamic Response Analysis under the Metro-Vibration Loading of Xi'an Bell Tower Timber Structure

2012 ◽  
Vol 170-173 ◽  
pp. 1361-1366 ◽  
Author(s):  
Zhao Bo Meng ◽  
Teng Fei Zhao ◽  
Shi Cai Cui ◽  
Jie Jin
Keyword(s):  
Dynamic Response ◽  
Technical Specification ◽  
Time History ◽  
Response Analysis ◽  
Winkler Foundation ◽  
Analysis Model ◽  
Time Dynamic ◽  
Bell Tower ◽  
Vibration Loading ◽  
The Impact

Taking Xi’an Bell Tower and metro line 2 as research background, at first, according to the theory of Euler-Bernoulli beam in Winkler foundation, the analysis model of train-track-foundation system was established, and then, time-history curve of metro-induced loading acts on tunnel structure is obtained by using Matlab produce platform. Secondly, two-dimensional finite element model of the structure-soil-tunnel interaction model was established using ANSYS. Taken loading time delay into consideration for the first time, dynamic response law of the bell tower under the metro-vibration loading is obtained. Finally, the impact of metro line 2 on Xi’an Bell Tower was evaluated according to the Technical specification for protection of historic buildings against man-made vibration.

scholarly journals Dynamic response characteristics of 93W alloy with a spherical structure

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 199-211
Author(s):  
Taiyong Zhao ◽  
Weizhan Wang ◽  
Zhigang Chen ◽  
Shunshan Feng ◽  
Likui Yin ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Metallographic Analysis ◽  
Radial Deformation ◽  
Transgranular Fracture ◽  
Dense Area ◽  
Response Characteristics ◽  
Spherical Component ◽  
Bright Band ◽  
Dynamic Response Characteristics ◽  
The Impact

AbstractTo study the dynamic response characteristics of 93W alloy spherical component under high overload, the deformation patterns of the 93W spherical component under different overloads are obtained by the sphereistic impact test, and the microscopic response characteristics are studied by the metallographic analysis experiments. Finally, the response characteristics are analyzed by the finite element method and the stress wave theory. The results show that with the change of impact overload, the axial direction of the 93W spherical component changes linearly with the radial deformation, and the axial strain increases with the increase of the impact overload. At the same time, along the radial direction from the center of the sphere, the micrograin distribution of 93W appears densely packed and sparsely separated, and the grain density is uniformly changed between dense area and sparse area, showing a ring-shaped “bright band” phenomenon between light and dark, and the width of the “bright band” is related to the size of the dense area of the grain; with the increase of the impact overload, the 93W alloy component first breaks at the central axis and the radial maximum position, and the fracture mode changes from the crystal fracture to the transgranular fracture tendency, and the two fracture forms eventually coexist.

scholarly journals Study on the Dynamic Response Characteristics of Cylindrical Coal-Rock Samples under Dynamic Loads

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Hongqing Zhu ◽  
Shuhao Fang ◽  
Yilong Zhang ◽  
Yan Wu
Keyword(s):  
Dynamic Response ◽  
Linear Relationship ◽  
Rock Sample ◽  
Axial Stress ◽  
Stress And Strain ◽  
Rock Samples ◽  
Response Characteristics ◽  
Coal Rock ◽  
Dynamic Response Characteristics ◽  
The Impact

To research the dynamic response characteristics of cylindrical coal-rock samples under impact loads, the impact of rigid bars on cylindrical coal-rock samples is simulated under different speed conditions, based on LS-DYNA software, and the dynamic distribution characteristics of the stress, strain, and energy of cylindrical coal-rock samples are analyzed. The results demonstrated the following: (1) the cylindrical coal-rock sample failed at the center first, and the damage developed downward along the axial direction. (2) The critical effective stress and strain have an exponential function relationship with the velocity, and the critical time has a linear relationship with the velocity. (3) The energy change law of the cylindrical coal-rock sample is consistent with the destruction morphology. (4) The axial stress peaks in the severe damage part have a linear relationship with the speed, the axial stress attenuates rapidly after passing the stress yield point, and the axial strain does not increase continuously. (5) The peaks stress and strain on the central axis and the radial line obey the power function distribution, the axial stress produces tensile stress in the axial propagation direction, and the axial stress and strain peaks at the same position are larger than those of the radial stress and strain peaks. This research provides a reference for studying coal and rock dynamic disasters.

Research on the Effect of Fluid-Structure Interaction on Dynamic Response of Gate Structure

2011 ◽  
Vol 199-200 ◽  
pp. 811-818
Author(s):  
Hua Gu ◽  
Gen Hua Yan
Keyword(s):  
Dynamic Response ◽  
Interaction Effect ◽  
Fluid Structure Interaction ◽  
Structural Response ◽  
Structural Dynamic ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Response Characteristics ◽  
Gate Structure ◽  
The Impact

This essay reveals that on the basis of fluid-structure interaction having appreciable impact on auto-vibration of gate structure, analysis and calculation on dynamic response characteristics of gate structural fluid-structure interaction have been conducted. The results indicate that under the same dynamic load the structural dynamic response value with fluid-structure interaction effect considered is remarkably larger than vibration response with fluid-structure interaction effect considering. The calculating results indicate that the largest response increase of typical parts of gate structure is from 50% to 60%. Therefore, as to making calculations on structural dynamic response with fluid-structure interaction effect, the impact flow field exerting on structural response should be taken into consideration.

Dynamic Response Analysis of Xi'an Bell Tower Timber Structure under the Metro-Vibration Load of Line 6

2013 ◽  
Vol 353-356 ◽  
pp. 1718-1723
Author(s):  
Teng Fei Zhao ◽  
Zhao Bo Meng ◽  
Jie Jin ◽  
Xi Feng Li
Keyword(s):  
Dynamic Response ◽  
Technical Specification ◽  
Time History ◽  
Timber Structure ◽  
Response Analysis ◽  
Winkler Foundation ◽  
Analysis Model ◽  
Time Dynamic ◽  
Bell Tower ◽  
The Impact

Taking Xian Bell Tower and metro line 6 as research background, at first, according to the theory of Euler-Bernoulli beam in Winkler foundation, the analysis model of train-track-foundation system was established, and then, time-history curve of metro-induced loading acts on tunnel structure is obtained by using Matlab software. Two-dimensional finite element model of the structure-soil-tunnel interaction model was established using software Ansys,. Taken loading time delay into consideration for the first time, dynamic response law of the bell tower under the metro-vibration loading is obtained. Finally, the impact of metro line 6 on Xian Bell Tower was evaluated according to the Technical specification for protection of historic buildings against man-made vibration. Xi'an Bell Tower timber structure is safe when two trains running of the line 6.

Parametric Analysis of the Dynamic Response of Hot-Rolled H-Shaped Steel Beam under Lateral Impact Load

2012 ◽  
Vol 215-216 ◽  
pp. 998-1002 ◽  
Author(s):  
Chang Pei ◽  
Rui Wang
Keyword(s):  
Dynamic Response ◽  
Impact Velocity ◽  
Impact Energy ◽  
Impact Load ◽  
Steel Beam ◽  
Lateral Impact ◽  
Analysis Model ◽  
Fea Model ◽  
Hot Rolled ◽  
The Impact

The analysis on the basic mechanical properties of hot-rolled H-shaped steel beam under lateral impact load was done by use of ABAQUS. The reliability of the FEA model was verified through comparing with the existing experiment of H-shaped steel beam subjected to lateral impact. And then, this FEA model was used to research the dynamic response of the H-shaped steel beam subjected to lateral impact. The main parameters include the impact energy, mass and impact velocity of the impact hammer. The results indicate that the finite element analysis model built in this paper could accurately simulate the process of hot-rolled H-shaped steel beam under lateral impact load and the impact energy, mass and impact velocity have different influences on the dynamic response of H-shaped steel beam.

Signature Modes of Old and New Violins with Symmetric Anatomical Wood Structure

2021 ◽  
Vol 11 (23) ◽  
pp. 11297
Author(s):  
Mircea Mihălcică ◽  
Mariana Domnica Stanciu ◽  
Silviu Marian Nastac ◽  
Florin Dinulică ◽  
Alina Maria Nauncef ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Dynamic Characteristics ◽  
Longitudinal Axis ◽  
Anatomical Structure ◽  
Wood Structure ◽  
Annual Rings ◽  
Quality Factors ◽  
Anatomical Features ◽  
The Face ◽  
The Impact

The paper aims to investigate old and new violins from the perspective of the correlation between the anatomical structure of spruce and maple wood, and the dynamic response of violins. Thus, in the first stage, for each violin, the characteristics of the annual rings were measured on the entire width of the top plate, determining the degree of symmetry of the face with respect to the longitudinal axis of the violin body. Then, each violin was dynamically tested with the impact hammer, determining its own frequency spectrum, mainly the so-called “signature” mode and quality factors. The most important findings consist of identification of the first five modes for old violins, (known as provenance), current new violins, and violins whose origin is unknown, but which could correlate with anatomical, constructive and dynamic characteristics, in order to be able establish origins, and also the measurement of anatomical features of top and back plates in the violins’ construction.

Dynamic Analysis of Non-Uniform Continuous Girder Bridge under Moving Vehicle

2011 ◽  
Vol 243-249 ◽  
pp. 1634-1637
Author(s):  
Zhi Gang Chen ◽  
Zi Lin Peng
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Numerical Solutions ◽  
Lagrange Equation ◽  
Field Testing ◽  
Vehicle Speed ◽  
Analysis Model ◽  
Moving Vehicle ◽  
Continuous Girder Bridge ◽  
The Impact

For non-uniform continuous bridge in actual projects, the theoretical analysis and field testing of the dynamic response under moving vehicle are carried out. Firstly, Euler-Lagrange equation is applied to derive the vibration equation of three-axle vehicle. Then one obtains the dynamic analysis model by using the finite element method and the vehicle-bridge interaction equation based on the displacement coordination relationship of the contact between wheels and bridge. Lastly, numerical solutions are presented according to the dynamic response of the bridge, compared with the real values. The results show that: the roadway roughness and vehicle speed strongly influence the impact factor.

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