Modal Analysis of a Container Filled with Water

2014 ◽  
Vol 592-594 ◽  
pp. 2122-2126
Author(s):  
M.L. Chandravanshi ◽  
Alok Kumar Mukhopadhyay
Keyword(s):  
Modal Analysis ◽  
Natural Frequencies ◽  
Fem Analysis ◽  
Structural Vibration ◽  
Mode Shapes ◽  
Design Stage ◽  
Modal Parameters ◽  
Element Analysis ◽  
Empty Container ◽  
Ansys Workbench

Modal analysis plays an important role at design stage which helps in diagnosing problems related to structural vibration. This paper delineates about the experimental work to investigate the modal parameters, such as mode shapes and natural frequencies of a metallic container. The modal parameters have been experimentally determined for the empty container, the container filled with one liter of water and the container filled with two liters of water. Theoretical analysis is also carried out through finite element analysis using ANSYS workbench 14 for finding out modal parameters of the empty container only. The boundary conditions of the container in the experimental and FEM analysis have been kept same. The values of modal parameters obtained by the two methods then compared for their proximity

Experimental and Numerical Modal Analysis of Gearbox Casing in a Polishing Machinery

2009 ◽  
Vol 69-70 ◽  
pp. 560-564
Author(s):  
Yang Yu Wang ◽  
Shi Ming Ji ◽  
Dong Hui Wen ◽  
Xian Zhang
Keyword(s):  
Modal Analysis ◽  
Natural Frequencies ◽  
Test System ◽  
Structural Vibration ◽  
Mode Shapes ◽  
Modal Parameters ◽  
Vibration Test ◽  
3D Fem ◽  
Fem Model

Vibrations in polishing machinery may affect the manual or automatic controls and reduce the efficiency of the operations to be carried out. In this article, an experimental and numerical analysis on the dynamic characteristic of a gearbox casing in polishing machinery have been carried out. The numerical investigation was achieved with NASTRAN based on a 3D FEM model and the experimental modal analysis for the determination of the natural frequencies and the associated eigenmodes of the gearbox casing with LMS structural vibration test system was performed. The fundamental modal parameters including the first 10-order natural frequencies, damping ratios and mode shapes were estimated and identified. Analytical and experimental results have been compared and discussed. Agreement between measurements and calculations is satisfactory and the results can be used as reliable reference for improving the dynamic behavior of the gearbox casing.

Static Analysis and Modal Analysis of Heavy-Load Manipulator Based on ANSYS

2014 ◽  
Vol 556-562 ◽  
pp. 1059-1064
Author(s):  
Zhang Li ◽  
Xi Zhe Zang ◽  
Lai Chun Suo ◽  
Yan He Zhu ◽  
Jie Zhao
Keyword(s):  
Modal Analysis ◽  
Static Analysis ◽  
Large Scale ◽  
Control Method ◽  
Mode Shapes ◽  
Element Analysis ◽  
Heavy Load ◽  
Manipulator Arm ◽  
Seamless Connection ◽  
Ansys Workbench

The heavy-load manipulator arm, an important part of the remote handling maintenance system of the large-scale multi-purpose deployer, plays a key role of the entire system. Its modeling and assembly was finished by Pro/E. Then use the ANSYS Workbench, finite element analysis software, to complete its static analysis and modal analysis through building a seamless connection between Pro/E and ANSYS Workbench. As a result, the overall deformation and static stiffness values of the manipulator arm were obtained through static analysis, and the former six-order natural frequency values and mode shapes were obtained through modal analysis. Finally, scheme of structure modification and new control method were presented by analyzing and comparing the results.

Structural vibration design of a pod structure including an optical system of a fighter aircraft

2021 ◽  
Vol 263 (1) ◽  
pp. 5555-5561
Author(s):  
Taeyoung Yoon ◽  
Jaemyung Cho ◽  
Sungsoo Na ◽  
Seongho Yoon
Keyword(s):  
Structural Dynamics ◽  
Optical System ◽  
Natural Frequencies ◽  
Free Vibration Analysis ◽  
Structural Vibration ◽  
Mode Shapes ◽  
Element Analysis ◽  
Fighter Aircraft ◽  
Frequency Responses ◽  
Improving Accuracy

Structural vibration design of a pod structure including an optical system installed on a fighter aircraft is very significant in improving accuracy of targeting system to the target objects. To reduce and isolate the vibration generated during the flight, it is crucial to properly design the rubber mount between the pod and the aircraft. In this study, free vibration analysis of the pod is conducted through finite element analysis (FEA) and experiments. Correlations are performed with reasonably acceptable accuracy about the natural frequencies, mode shapes, and frequency response functions obtained by FEA and experiment. Then to optimize the structural dynamics of the pod, three variables are considered, which are mass of the dummies, the numbers of and positions of rubber mounts, and hyperelastic property of rubber mounts. In addition, the position of the pod on the fighter is analysed by FEM to estimate the possibility of further enhancement of its structural dynamics. Finally, forced vibration was undertaken using random signals of a shaker with 1Grms, 2Grms and 2.65Grms considering the test standard. It is found out that frequency responses of the pod are sensitive below 100 Hz to the values of the excitation signals. It is thus indeed to design appropriately the rubber mounts to improve structural dynamics of the pod, which results in the accuracy of targeting system.

Analysis on Dynamic Characteristics of HTC100 NC Lathe Bed

2011 ◽  
Vol 328-330 ◽  
pp. 700-703
Author(s):  
Mo Wu Lu ◽  
Guo Ming Zhang ◽  
Wei Qiang Zhao
Keyword(s):  
Modal Analysis ◽  
Performance Indicators ◽  
Natural Frequencies ◽  
Dynamic Performance ◽  
Analysis Method ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
3D Solid ◽  
Modal Vibration ◽  
Ansys Workbench

The processing performance is closely related with dynamic performance and the dynamic performance is one of the most important performance indicators which is affecting the performance and product quality. The machine is affected most by the dynamic performance of machine bed. The modal analysis method is used to analyze the dynamic performance of the machine. In this paper, the modal analysis of lathe bed is conducted. A 3D solid model of HTC100 NC lathe bed is built with SolidWorks. In order to facilitate the finite element analysis, the model of lathe bed is simplified. The modal analysis of lathe bed is calculated with ANSYS Workbench 12. The first six natural frequencies and corresponding modes are obtained through modal analysis of the lathe bed. According to the low-order natural frequency and modal vibration shapes, the rigidity vulnerable area of lathe bed is realized, which provides the reliable theory to improve lathe bed structure.

FEM Analysis of a Diesel Engine’s Cylinder Head

2012 ◽  
Vol 490-495 ◽  
pp. 3023-3026
Author(s):  
Shao Zhong Jiang
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Cylinder Head ◽  
High Speed ◽  
Structural Characteristics ◽  
Fem Analysis ◽  
Mode Shapes ◽  
Element Analysis ◽  
Frequency Distributions ◽  
And Control

The article aims at the cylinder head used in a high speed and higher-power diesel engine. In order to obtain the vibration characteristics and vibration frequency distributions. By means of modal analysis technology and finite element method (FEM), structural characteristics of the cylinder head using modal analysis is investigated. Firstly, a physical model of the cylinder head is built. Through the comparison of all the modal analysis results with different meshing densities, a tetrahedron ten-node element with length of 30mm is selected. Then finite element analysis of the model is taken by FEM software. The cylinder head’s modal parameters namely its natural frequency are calculated and its mode shapes are identified. The results can provide basis for the engine’s dynamic analysis and control of the diesel engine’s noise

Study on Vibration Characteristics for Vehicle Inner Doors

2016 ◽  
Vol 693 ◽  
pp. 227-232
Author(s):  
Ming Yu ◽  
Xue Wu Hong ◽  
Zhi Peng Gao ◽  
Si Zhuo Zhao
Keyword(s):  
Natural Frequencies ◽  
Mode Shapes ◽  
Modal Parameters ◽  
Element Analysis ◽  
Dynamic Design ◽  
Car Safety ◽  
Door Panel ◽  
Weak Points ◽  
Modal Vibration ◽  
Normal Work

It has been easy to deformation for car doors which opened and closed parts of a vehicle to withstanding various loads. Not only affected the car's appearance and degree of opening, but also deformation increased when subjected to collision. Therefore, it is great significance to internal board dynamic design of the car safety through dynamic analysis of the key pieces of the door to access to inner door panel features. In the paper, the method based on the calculation mode is proposed to analyses the dynamic characteristic of the car doors. The modal analysis of the inner door panel is respectively the inner door panel and the circumference of the fixed constraint on the free-state. The modal parameters and the mode shapes are calculated through finite element analysis. According to these FEM calculating results, the low-order natural frequencies and modal vibration shapes of the inner door panel are computed and identified on the two states. On the basis of these modal parameters, the faults of the inner door panel are shown and its weak points of the design are illustrated. The reason for deformation is analyzed and relevant measures employed to reduce faults are proposed. These improvements can guarantee the normal work of the tool cutter.

scholarly journals Comparisons of Differential Filtering and Homography Transformation in Modal Parameter Identification from UAV Measurement

Sensors ◽  
2021 ◽  
Vol 21 (16) ◽  
pp. 5664
Author(s):  
Jiqiao Zhang ◽  
Zhihua Wu ◽  
Gongfa Chen ◽  
Qiang Liang
Keyword(s):  
Modal Analysis ◽  
Natural Frequencies ◽  
Time History ◽  
Reference Points ◽  
Image Correlation ◽  
Mode Shapes ◽  
Modal Parameters ◽  
Modal Parameter ◽  
Filtering Method ◽  
Homography Transformation

This paper proposes a differential filtering method for the identification of modal parameters of bridges from unmanned aerial vehicle (UAV) measurement. The determination of the modal parameters of bridges is a key issue in bridge damage detection. Accelerometers and fixed cameras have disadvantages of deployment difficulty. Hence, the actual displacement of a bridge may be obtained by using the digital image correlation (DIC) technology from the images collected by a UAV. As drone movement introduces false displacement into the collected images, the homography transformation is commonly used to achieve geometric correction of the images and obtain the true displacement of the bridge. The homography transformation is not always applicable as it is based on at least four static reference points on the plane of target points. The proposed differential filtering method does not request any reference points and will greatly accelerate the identification of the modal parameters. The displacement of the points of interest is tracked by the DIC technology, and the obtained time history curves are processed by differential filtering. The filtered signals are input into the modal analysis system, and the basic modal parameters of the bridge model are obtained by the operational modal analysis (OMA) method. In this paper, the power spectral density (PSD) is used to identify the natural frequencies; the mode shapes are determined by the ratio of the PSD transmissibility (PSDT). The identification results of three types of signals are compared: UAV measurement with differential filtering, UAV measurement with homography transformation, and accelerometer-based measurement. It is found that the natural frequencies recognized by these three methods are almost the same. This paper demonstrates the feasibility of UAV-differential filtering method in obtaining the bridge modal parameters; the problems and challenges in UAV measurement are also discussed.

scholarly journals DIC-Based Operational Modal Analysis of Bridges

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Gongfa Chen ◽  
Zhihua Wu ◽  
Chunjian Gong ◽  
Jiqiao Zhang ◽  
Xiaoli Sun
Keyword(s):  
Modal Analysis ◽  
Natural Frequencies ◽  
Operational Modal Analysis ◽  
Mode Shapes ◽  
Modal Parameters ◽  
Small Displacement ◽  
Dynamic Displacement ◽  
Bridge Model ◽  
Shooting Distance ◽  
Dic Technique

A new method has been proposed to identify the natural frequencies and mode shapes of a bridge model, in which the digital image correlation (DIC) technique is used to track the dynamic displacement. A key issue in vibration-based damage detection for a bridge is to determine its modal parameters. It is difficult to use traditional acceleration sensors to obtain the accurate mode shapes of bridges as the sensors are only deployed on a few measurement points of the bridges. In this article, the DIC technique is used to capture the movement of the entire experimental bridge model. A steel truss is used as a bridge model and stimulated by a hammer; its dynamic displacement is recorded by using a digital video camera. The correlation analysis is used to track the displacement of the points of interest, and their displacement time histories are inputted into a modal analysis system; the natural frequencies and mode shapes of the bridge model were obtained by both operational modal analysis (OMA) and traditional experimental modal analysis (EMA) methods. (1) The DIC results are compared with those obtained by a traditional acceleration sensor-based method; the natural frequencies obtained by the two measurement methods are very close. (2) The DIC results are sensitive to the amplitude of the measured displacement and the shooting distance; small displacement amplitudes and long shooting distance may result in the low quality of the measured time-history curves, and low-frequency noise signals might be observed in their power spectral density (PSD) curves, while they can be easily solved by the filtering method in this article. (3) In addition, the first frequencies obtained by EMA and OMA are very close, which validates the applicability of the DIC measurement under ambient excitation. The research has illustrated the feasibility of the DIC method for obtaining the modal parameters of the bridges.

scholarly journals Vibration Modes and Parameter Analysis of V-Shaped Electrothermal Microactuators

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Zhuo Zhang ◽  
Yueqing Yu ◽  
Xuping Zhang
Keyword(s):  
Modal Analysis ◽  
Natural Frequencies ◽  
Frequency Equation ◽  
Parameter Analysis ◽  
Mode Shapes ◽  
Element Analysis ◽  
Shaped Beam ◽  
The Finite Element Analysis ◽  
Parametric Studies ◽  
First Time

Comprehensive analysis on the modal characteristics of V-shaped electrothermal microactuators is presented in this paper for the first time. Considering the unique geometric characteristics of the V-shaped beam, that is, two inclined beams supporting a movable shuttle, both the lateral and longitudinal deflections are taken into account in the modal analysis. Boundary and continuity conditions are employed to obtain the frequency equation. Natural frequencies are then obtained by solving the frequency equation. Mode shapes corresponding to their natural frequencies are also calculated analytically. The theoretical modal analysis is verified with the finite element analysis using ANSYS software. Based on the model analysis, this paper further investigates the relationship between natural frequencies and the volume scaling of the V-shaped beam. Finally, comprehensive parametric studies in terms of material properties and structural dimensions are conducted to provide insights and guidance in designing the V-shaped beam electrothermal microactuators.

Statics and Modal Analysis for Large Vibrating Screen

2013 ◽  
Vol 380-384 ◽  
pp. 136-139 ◽  
Author(s):  
Wen Feng He ◽  
A Man Xian
Keyword(s):  
Modal Analysis ◽  
3D Modeling ◽  
3D Model ◽  
Mode Shapes ◽  
Stress And Strain ◽  
Element Analysis ◽  
Modeling Software ◽  
Stress And Strain Distribution ◽  
Vibration Shaker ◽  
Ansys Workbench

The 3D modeling software of Solidworks was used in the paper for the 3D modeling of large banana vibration shaker. And then the 3D model was imported into Ansys Workbench for finite element analysis. The overall stress and strain distribution of the shaker could be got under static loading. Secondly, the analysis of the dynamic characteristics of the entire shaker should be done, and the modal frequencies and mode shapes could be got through the analysis of the modal analysis results. Finally, the hammering test was done to verify the theoretical analysis. And it also provided a necessary theoretical basis for the design and improvement of the entire shaker.

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