Modal Analysis of Vibration and its Program Development in Power Transformer Core

2014 ◽  
Vol 986-987 ◽  
pp. 936-939
Author(s):  
Fang Xu Han ◽  
Yan Li ◽  
Xin Sun ◽  
Huan Wang
Keyword(s):  
Modal Analysis ◽  
Vibration Frequency ◽  
Natural Vibration ◽  
Simulation Analysis ◽  
Power Transformer ◽  
Strong Support ◽  
Natural Vibration Frequency ◽  
Design And Optimization ◽  
Element Simulation ◽  
Transformer Core

In this paper, based on the modal analysis combined with power transformer product structure, using the empirical formula calculation method and finite element simulation analysis software calculates the natural vibration frequency of power transformer core, respectively, while making the VB language as a tool to develop the calculation software of natural vibration frequency of power transformer, provides a strong support for product tenders, design and optimization.

scholarly journals An Efficient Model to Calculate Axial Natural Vibration Frequency of Power Transformer Winding

2016 ◽  
Vol 21 (3) ◽  
pp. 431-436
Author(s):  
Kaiqi Li ◽  
Jian Guo ◽  
Jun Liu ◽  
Anhong Zhang ◽  
Shaojia Yu
Keyword(s):  
Vibration Frequency ◽  
Natural Vibration ◽  
Power Transformer ◽  
Natural Vibration Frequency ◽  
Transformer Winding

Wave Spring Dynamic Characteristics Analysis

2014 ◽  
Vol 1037 ◽  
pp. 37-40
Author(s):  
Mo Wu Lu ◽  
Tan Wang
Keyword(s):  
Modal Analysis ◽  
Vibration Frequency ◽  
Natural Vibration ◽  
Response Analysis ◽  
Natural Vibration Frequency ◽  
Vibration Direction ◽  
Characteristics Analysis ◽  
Spring System ◽  
Harmonic Response Analysis ◽  
The Stability

The natural vibration frequency and forced vibration amplitude of the spring decides the stability of the whole of the spring system. Take the monolayer wave spring as the research object, do dynamics analysis for the three different kinds of wave spring with the same structure parameters. Obtain the natural vibration frequencies of the three kinds of spring through modal analysis, the result shows that the natural vibration frequency of the integral type wave spring is the highest, then is the wave spring with opening, the natural vibration frequency of the wave spring with lapping is the lowest. Do the harmonic response analysis for the springs based on the modal analysis result, the result shows that the main vibration direction of the wave spring is the symmetry axis direction of the spring, all the three kinds of the spring is much easier resonate in this direction. Through the above provides certain theoretical guidance for the design of the wave spring

Numerical Simulation Analysis of Vibrating Screen’s Structure Vibration Property

2011 ◽  
Vol 215 ◽  
pp. 272-275
Author(s):  
Y.X. Shen ◽  
Ke Hua Zhang ◽  
Y.C. Chen ◽  
H.W. Zhu ◽  
K. Fei
Keyword(s):  
Numerical Simulation ◽  
Vibration Frequency ◽  
Natural Vibration ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Experimental Result ◽  
Natural Vibration Frequency ◽  
Vibration Displacement ◽  
Vibrating Screen ◽  
Structure Vibration

Vibrating screen sifts materials via screen mesh, vibration displacement and velocity. In order to completing optimal design of vibrating screen’s vibration frequency. Firstly, Using the CAD function of the three dimensional software UG NX 6.0 to achieve vibrating screen modeling. Secondly, modal simulation analysis was carried out using the simulation soft NX NASTRAN. Numerical simulation experimental result indicates: this designed vibrating screen’s natural vibration frequency are 27.79Hz, 32.58 Hz, and 46.39Hz, consequently, designing this vibrating screen should avoid identical or approaching these natural vibration frequencies as far as possible, while choosing the vibration frequency.

Study on the Influence of Reactor Core Structure on Reactor Natural Vibration Frequency

2021 ◽  
Author(s):  
Yuan Zhou ◽  
Tian Tian ◽  
Xiongfei Yu ◽  
Ran Ren ◽  
Liangcai Zhou ◽  
...  
Keyword(s):  
Vibration Frequency ◽  
Natural Vibration ◽  
Reactor Core ◽  
Core Structure ◽  
Natural Vibration Frequency

scholarly journals Analysis of the natural oscillation frequency of the long-span trusses with flanged connections

2021 ◽  
pp. 76-85
Author(s):  
Татьяна Георгиевна Рытова ◽  
Людмила Анатольевна Максимова ◽  
Анастасия Георгиевна Николаева ◽  
Татьяна Михайловна Макарова ◽  
Надежда Георгиевна Пфаненштиль
Keyword(s):  
Dynamic Characteristics ◽  
Vibration Frequency ◽  
Natural Vibration ◽  
Natural Oscillation ◽  
Natural Vibration Frequency ◽  
Building Structures ◽  
Long Span ◽  
Local Areas ◽  
Calculation Results ◽  
Natural Oscillation Frequency

Приводится анализ частоты собственных колебаний большепролетной фермы с фланцевыми соединениями. Выполнен расчет фланцевого соединения с различными случаями исключения болтов из работы соединения. Анализ результата расчета показал, что возникновение повреждений и дефектов конструкций здания в локальных зонах, величина которых несущественно снижает общую жесткость каркаса, практически не влияет на динамические характеристики каркаса. The analysis of the natural vibration frequency of a large-span truss with flanged connections is given. The calculation of the flange connection with various cases of exclusion of bolts from the connection operation is performed. Analysis of the calculation results showed that the occurrence of damage and defects in the building structures in local areas, the value of which significantly reduces the overall rigidity of the frame, practically does not affect the dynamic characteristics of the frame.

An Experimental Investigation on Cylinder VIV Trajectories Under Different Model Scale

2014 ◽  
Author(s):  
Zh. Kang ◽  
Yunhe Zhai ◽  
Ruxin Song ◽  
Liping Sun
Keyword(s):  
Experimental Investigation ◽  
Vibration Frequency ◽  
Degrees Of Freedom ◽  
Natural Vibration ◽  
Cross Flow ◽  
Small Scale ◽  
Natural Vibration Frequency ◽  
Test Results ◽  
The Cross ◽  
Initial Research

In this paper, model tests were carried out to investigate two degrees of freedom VIV of horizontally-laid cylinders with diameters of 5cm, 11cm, 20cm and length 120cm and compared their vibration trajectories. The test results showed that the in-line and cross-flow vibration frequency of different scale cylinders demonstrate “multi frequency” phenomenon, that is, the in-line vibration frequency is not only twice but also once or four times as much as the cross-flow vibration frequency in some scale, natural frequency and reduced velocity conditions. Also, the cross-flow multi-frequency vibration phenomenon occurred. The trajectory of the vibration cylinder differentiated from the traditional “8” shape accordingly. The vibration trajectory, especially of small-scale cylinder, changed in most conspicuous manner. Through the initial research and analysis, it was found that in addition to in-line and cross-flow natural vibration frequency and the flow velocity, the shape of cylinders was also one of the main causes leading to different vibration trajectory forms.

Active Stiffening of Composite Materials by Embedded Shape-Memory-Alloy Fibres

1996 ◽  
Vol 459 ◽  
Author(s):  
J.-E. Bidaux ◽  
J.-A. E. Månson ◽  
R. Gotthardt
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Vibration Frequency ◽  
Composite Beam ◽  
Natural Vibration ◽  
Transformation Strain ◽  
Natural Vibration Frequency ◽  
The Matrix ◽  
Clamping Device ◽  
Composite Response

ABSTRACTThe use of shape-memory-alloy (SMA) fibres to actively changethe stiffness of a composite beam is investigated on a model system composed of an epoxy matrix with a series of embedded pre-strained NiTi fibres. Stiffness changes are detected through shifts in the natural vibration frequency of the beam. When electrically heated, the pre-strained NiTi fibres undergo a phase transformation. Since the shape recovery associated with the transformation is restrained by the constraints of both the matrix and the clamping device, a force is generated. This force leads to an increase in the natural vibration frequency of the composite beam. Depending on the degree of fibre pre-strain, either ordinary martensite, R-phase or a mixture of the two can be stress-induced. It is found that the R-phase gives rise to the largest change in vibration frequency for a given temperature increase and the most reversible behaviour. Its low transformation strain is also more favourable for fibre-matrix adhesion. The effect of stress relaxation in the polymer matrix on the composite response is discussed.

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