Calculation and analysis of natural frequency of transformer based on finite element model

2015 ◽  
pp. 1729-1732
Author(s):  
Chunning Wang ◽  
Bingbing Chen ◽  
Honghua Xu ◽  
Hongzhong Ma ◽  
Jiewei Gong
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Element Model

scholarly journals Design optimization of vehicle asynchronous motors based on fractional harmonic response analysis

2021 ◽  
Vol 12 (1) ◽  
pp. 689-700
Author(s):  
Ao Lei ◽  
Chuan-Xue Song ◽  
Yu-Long Lei ◽  
Yao Fu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Asynchronous Motor ◽  
Element Model ◽  
Design Parameters ◽  
Response Analysis ◽  
Harmonic Response ◽  
First Order ◽  
Harmonic Response Analysis

Abstract. To make vehicles more reliable and efficient, many researchers have tried to improve the rotor performance. Although certain achievements have been made, the previous finite element model did not reflect the historical process of the motor rotor well, and the rigidity and mass in rotor optimization are less discussed together. This paper firstly introduces fractional order into a finite element model to conduct the harmonic response analysis. Then, we propose an optimal design framework of a rotor. In the framework, objective functions of rigidity and mass are defined, and the relationship between high rigidity and the first-order frequency is discussed. In order to find the optimal values, an accelerated optimization method based on response surface (ARSO) is proposed to find the suitable design parameters of rigidity and mass. Because the higher rigidity can be transformed into the first-order natural frequency by objective function, this paper analyzes the first-order frequency and mass of a motor rotor in the experiment. The results proved that not only is the fractional model effective, but also the ARSO can optimize the rotor structure. The first-order natural frequency of asynchronous motor rotor is increased by 11.2 %, and the mass is reduced by 13.8 %, which can realize high stiffness and light mass of asynchronous motor rotors.

The Analysis of Influence Factors about Dynamic Characteristics of a Ball Screw Feed Drive System

2015 ◽  
Vol 799-800 ◽  
pp. 576-580 ◽  
Author(s):  
Yi Guang Shi ◽  
Hui Xiao ◽  
Jun Ao Zhang ◽  
Da Wei Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Element Model ◽  
Drive System ◽  
Ball Screw ◽  
Feed Drive ◽  
Joint Parameters ◽  
Feed Drive System ◽  
Screw Feed

This paper presents relationships between some vital parameters and the natural frequency of the ball screw feed drive system. A finite element model (FEM) of a machine tool feed drive system is established with joint parameters added in based on the SAMCEF software. Using the finite element model, the influences of the material properties of the worktable, the diameter of the ball screw and joint parameters on the natural frequency of axial vibration are derived. These results provide a reliable basis for the optimization design of the ball screw feed drive system.

Dynamic Character of a Novel Three-Axis Decoupled Compliant Mechanism

2013 ◽  
Vol 655-657 ◽  
pp. 1119-1122
Author(s):  
Sheng Lin ◽  
Chun Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Vibration Mode ◽  
Compliant Mechanism ◽  
Rotation Axis ◽  
Element Model ◽  
Dynamic Character ◽  
Input And Output ◽  
The Finite Element Model

A novel three-axis compliant mechanism is presented. Three original constraints are selected from the freedom and constraint complement topology chart. A compliant mechanism with three rotation freedoms is designed. Constraint 2 and Constraint 3 is designed as a whole to improve the precision and natural frequency. The finite element model is established. And the natural frequency and the main vibration mode are obtained. The deformation of the rotation axis is small. The input and output of the compliant mechanism is decoupled.

The Research of Drive Roll’s Dynamics Characteristics

2014 ◽  
Vol 597 ◽  
pp. 498-501
Author(s):  
Shao Hai Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Mode Shape ◽  
Vibration Mode ◽  
Element Model ◽  
Set Up ◽  
Drive Roll ◽  
Ansys Workbench

In order to research the dynamic characteristics of drive roll, finite element model of the drive roll was set up by ANSYS/Workbench. The drive roll’s natural frequency and vibration mode concerned in reality were acquired based on modal analysis, deformation trend and size of each mode shape were analysed, then deformation of the weak positions about each mode was cleared, and some measures about improving its dynamic characteristics were proposed, all of these offered a support to strengthen drive roll’s damping property.

scholarly journals Multicriteria Optimization Design for End Effector Mounting Bracket of a High Speed and Heavy Load Palletizing Robot

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Ying He ◽  
Jiangping Mei ◽  
Jiawei Zang ◽  
Shenglong Xie ◽  
Fan Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Multicriteria Optimization ◽  
High Speed ◽  
Optimization Design ◽  
Element Model ◽  
Contrastive Analysis ◽  
Heavy Load ◽  
End Effector

End effector mounting bracket is an important load bearing part of high speed and heavy load palletizing robot, which is located at the most distant point in robot rotation radius and frequently works in complex conditions such as start-stop, switch direction, and acceleration and deceleration motion; therefore, optimizing design for its structure is beneficial to improve the dynamic performance of robotic system and reduce energy consumption. Firstly, finite element model of end effector mounting bracket was established, and its accuracy was verified by contrastive analysis of modal test result and finite element model. Secondly, through modal analysis, vibration response test, frequency response analysis, and the static analysis, taking inertia into account, the mass is minimized, the maximal stress is minimized, the maximal deformation is minimized, and the first natural frequency is maximized as the optimization objectives are determined; the design variables were selected by sensitivity analysis, taking their value range as the constraint conditions; approximation models of objective functions were established by the Box-Behnken design and the response surface methodology, and their reliability was validated; to determine weighting factor of each optimization objective, an analytic hierarchy process based on finite element analysis (FEA + AHP) method was put forward to improve the objectivity of comparison matrix; subsequently, the multicriteria optimization mathematical model was established by the methods mentioned above. Thirdly, the multicriteria optimization problem was solved by the NSGA-II algorithms and optimization results were obtained. Finally, the contrastive analysis results between optimized model and initial model showed that, in the case of the maximum stress and deformation within allowable values range, the mass reduction was 17.8%; meanwhile, the first natural frequency was increased, and vibration response characteristics of the entire structure were improved significantly. The validity of this optimization design method was verified.

scholarly journals Concept Calculation Tool for Dynamics of Generator Set Common Baseframe

2017 ◽  
Vol 50 (3) ◽  
pp. 353-356 ◽  
Author(s):  
Johannes Heilala ◽  
Teemu Kuivaniemi ◽  
Juho Könnö ◽  
Tero Frondelius
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Element Model ◽  
Simulation Software ◽  
Design Tool ◽  
Vibration Response ◽  
Model Generation ◽  
Concept Design ◽  
Common Base

The Natural frequency and vibration response calculation process of a generator set was automatized so that it can be used in a generator set common base frame concept design. The implementation of automatization was to be done so that no profound knowledge about the finite element method is needed to execute calculations and that computation times are short. Substructuring is used for certain parts of the generator set model to reduce the computation times for more a efficient concept design process. The common base frame concept design is implemented to the process by using a design tool in which the finite element model generation from parametric geometry is automatized. Generator set finite element model generation, natural frequency and vibration response calculations and post-processing of analysis results were implemented by developing a calculation tool for this purpose. The calculation tool is an independent application that uses Abaqus simulation software to execute analyses.

Influence of External Tendons on Dynamic Characteristics of Box Girder with Corrugated Steel Webs

2010 ◽  
Vol 163-167 ◽  
pp. 2131-2136 ◽  
Author(s):  
Jian Bo Chen ◽  
Bao Dong Liu ◽  
Peng Fei Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Element Model ◽  
Box Girder ◽  
External Tendons ◽  
The Impact ◽  
The Finite Element Model

Based on Miyamoto’s method, the natural frequency of prestressed box girder with corrugated steel webs considering the impact of external tendons was obtained. And the result was modified based on the finite element model. It shows that: the external tendons will reduce the natural frequency of bridge with reduced range of about 3%. Beneficial references were provided to the layout of external tendons in order to avoid the resonance between the box girder with corrugated steel webs and the external tendons.

Beam design for voice coil motors used for energy harvesting purpose with low frequency vibrations: A finite element analysis

2016 ◽  
Vol 07 (03) ◽  
pp. 1640001 ◽  
Author(s):  
Hector A. Tinoco
Keyword(s):  
Finite Element ◽  
Energy Harvesting ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Low Frequency ◽  
Voice Coil Motor ◽  
Element Model ◽  
Design Tool ◽  
Beam Design ◽  
Low Frequency Vibration

In this study, a numerical approach is established to design a beam coupled to a Voice Coil Motor (VCM) with the aim to maximize the displacement in the inductive transducer. A finite element model is developed to simulate a VCM with different beams applying a harmonic analysis. The VCM is extracted from a recycled hard disk drive (HDD) and a parametric modal analysis is performed to identify the material parameters of the HDD and the beam. These parameters are obtained comparing the real vibration modes and natural frequencies (VCM-beam) with those determined from the finite element model. A numerical-experimental case study is carried out to demonstrate that if a beam is designed for a specific low frequency vibration between 0 and [Formula: see text], the displacements are maximized in the VCM. For this purpose, real acceleration measurements taken from three individuals are used to provide the vibration signals in the numerical model. A beam is designed for one of the individuals using the natural frequency values determined from the measured signals. Results show that the displacements are maximized in the model which coincides with the natural frequency of the chosen individual. The main purpose of this research is to establish a design tool for energy harvesting purposes with VCM based on low frequency vibration sources as for example gait motions.

Finite Element Model Analysis on Five-Cylinder Marine Diesel’s Crankshaft Based on UG and ANSYS

2012 ◽  
Vol 538-541 ◽  
pp. 677-681
Author(s):  
Jun Luo ◽  
Jie Sun ◽  
Guang Jie Yuan
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Natural Frequency ◽  
Element Model ◽  
Model Analysis ◽  
Mode Shapes ◽  
Three Dimension ◽  
The Core ◽  
Core Components

Ship host is the heart of one ship, while the crankshaft is the core components of ship host. Created a three-dimension crankshaft’s modal through UG, then use FEM software ANSYS to simplified the characteristics details and constraints. Take the modal analysis of the crankshaft in order to gain the natural frequency and mode shapes).

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