Study on Dynamics Analysis and Application of Vibration Modal Testing of Suspension Cable Structure Based on MEMS Sensor

2013 ◽  
Vol 448-453 ◽  
pp. 2149-2152
Author(s):  
Yao En Yang ◽  
Qing Min Wang
Keyword(s):  
Finite Element ◽  
Vibration Mode ◽  
Dynamic Test ◽  
Element Model ◽  
Test System ◽  
Modal Testing ◽  
Element Analysis ◽  
Structural Dynamic ◽  
Mems Sensor ◽  
Inherent Frequency

The large span suspension structure is easy to generate larger vibration due to its smaller stiffness. For this problem, a finite element modal analysis method that considers the effect of initial pre-stress is proposed. The finite element model of the structure is established by using Link10 unit of the finite element analysis software ANSYS. Then the first four order natural frequency and vibration mode under different initial pre-stress is solved by the subspace iterative method. And the experimental test system based on MEMS sensor is designed to analyze the layout of test points and exciting vibration mode of the structure. The test system measures the inherent frequency and the first two order vibration mode under the action of different pre-stress. The results show that the numerical analysis results are basically consistent with the experimental results and the inherent frequency of the structure distributes in the plexus intensive form. And the inherent frequency of the structure is related to the pre-stress. The bigger the stiffness of the structure, the greater the inherent frequency is. It proves that the theoretical analysis results are correct and the experiment test system can be used in the structural dynamic test.

Finite Element Simulation and Dynamic Test of the Bridge Structure

2011 ◽  
Vol 52-54 ◽  
pp. 2191-2196
Author(s):  
Yu Qing Liu ◽  
Yan Xiang Wu ◽  
Hai Bo Huo
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Dynamic Test ◽  
Element Model ◽  
Scientific Basis ◽  
Element Analysis ◽  
Structural Dynamic ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

In this paper, we established a bridge three-dimensional finite element model for the structural dynamic analysis according to the geometry and material properties of a bridge Li Gong Yi Qiao at Wuhan University of Technology. On the other hand, we tested the dynamic characteristics of the bridge under environmental excitation by means of bridge sensors arranged at different points. The modal parameters of the bridge were identified through fitting the admittance circle. The comparison between the measured results and the theoretical studies has shown that the low-order vibration frequency and mode obtained from finite element analysis generally consistent with those from test. The finite element model provides a scientific basis for condition monitoring of the bridge in actual operations.

Vibration and Noise Reduction Analysis of Snowplow’s GearBox Case Based on Modal Analysis

2016 ◽  
Vol 13 (10) ◽  
pp. 7426-7432
Author(s):  
Xiangyang Jin ◽  
Jun Wang ◽  
. Zhihui ◽  
Zhihui Sun ◽  
Qiyun Yang ◽  
...  
Keyword(s):  
Finite Element ◽  
Noise Reduction ◽  
Modal Analysis ◽  
Vibration Mode ◽  
Element Model ◽  
Element Analysis ◽  
Modeling Technology ◽  
Comparison Results ◽  
Vibration Noise ◽  
Excessive Noise

Study has been conducted on how, where and why does excessive noise generate on the gear-box of the snowplow, and, measures for improvement have been presented. As well, analysis to the generation mechanism of vibration noise of gearbox and gears has been made, to find out the source of the noise. Next, a precise model of the gearbox, built by using 3D modeling technology, was translated into finite element model to make the modal analysis. Through analyzing characteristics of each vibration mode, positions of the gearbox case on which a vibration is most likely to be generated have been determined. To check the accuracy of theoretical calculation, vibration and noise tests were made to the gearbox. Specific measures for improvement were then put forward by combining results from both finite element analysis and experimental analysis. The comparison results showed that: the improved gearbox case had a significant effect on noise reduction, and the goal of reducing vibration and noise was achieved.

Modal Analysis of Scraper Chain Industrial Robot System

2014 ◽  
Vol 490-491 ◽  
pp. 1190-1193
Author(s):  
Na Liu ◽  
Dian Long Zou ◽  
Tian Jiao Zhou ◽  
Jian Wei Zhao
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Dynamic Characteristics ◽  
Vibration Mode ◽  
Industrial Robot ◽  
Three Dimensional ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Rail Line ◽  
Inherent Frequency

This paper researched dynamic characteristics of 5-DOF scraper chain handling robot by finite element modal analysis. Firstly established the whole three-dimensional model with Solidworks, secondly, transferred it into the ANSYS finite element analysis software to analyze dynamic characteristics in two fixed work positions when it was grasping a scraper chain and carrying a scraper chain on a rail line. It was found the weak component which vibrated heavily was the big arm from the analysis of the top 5 order vibration mode. Then studied modal analysis of the big arm to obtain the its inherent frequency and vibration mode. Finally put forward some suggestions about the design of the handling robot and improved its dynamic characteristics which is meaningful to increase its stability and reliability.

The Modal Analysis of the Main Steel Structure of Bucket Wheel Stacker Reclaimer

2013 ◽  
Vol 690-693 ◽  
pp. 3121-3124 ◽  
Author(s):  
Peng Shang ◽  
Yao Zong Hu ◽  
Li Hu He ◽  
Yu Ming Guan
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Vibration Mode ◽  
Steel Structure ◽  
Element Model ◽  
Inherent Frequency ◽  
The Finite Element Model

The vibration mode of main steel structure of bucket wheel stacker reclaimer is complex and changeable, so its modal analysis is necessary. In this paper, the main steel structure of bucket wheel stacker reclaimer was integrally designed and its main parameters were determined. then the finite element model of the main steel structure of the bucket wheel stacker reclaimer was established and the modal analysis was simulated, finally the results of its inherent frequency were calculated by FEA method.

Modal Analysis of Seat Frame of Bulldozer's Cab Based on Finite Element Method

2012 ◽  
Vol 479-481 ◽  
pp. 1375-1379
Author(s):  
You Liang Yao ◽  
Cui Peng Zuo ◽  
Cui Lan Li ◽  
Li Wang ◽  
Hao Li
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Dynamic Characteristics ◽  
Vibration Mode ◽  
Element Model ◽  
Weak Links ◽  
Inherent Frequency ◽  
Structure Improvement ◽  
Seat Frame ◽  
The Finite Element Model

As the seat frame is an essential structure of bulldozer's cab, dynamic characteristics of the structure are particularly important. The finite element model of the seat frame was established by CATIA software, and then modal analysis was carried out in absolute freeness. After investigating inherent frequency and vibration mode of several typical modes seriously, dynamic characteristics of the frame were clear. Weak links of the structure were obtained on the basis of analysis result, and structure improvement was conducted. Finally, the comparison and analysis was carried out between the unmodified seat frame and the modified one, the result shows that the dynamic characteristic of seat frame is optimized.

Experimental and numerical investigation of the effect of microstructural changes on the vibrational characteristics of ck35 steel

2021 ◽  
pp. 095440622110207
Author(s):  
Amirali Amirian ◽  
Seyed Ebrahim Moussavi Torshizi ◽  
Seyed Hossein Dibajian
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Loss Factor ◽  
Element Model ◽  
Experimental Results ◽  
Modal Testing ◽  
Element Analysis ◽  
Microstructural Changes ◽  
Vibrational Characteristics ◽  
Damping Loss Factor

This study aims to identify the microstructural changes of metal by measuring its natural frequency and damping loss factor. For this purpose, six CK35 steel specimens with ferritic-pearlitic structure were prepared and then, four specimens were spheroidized to significantly change microstructures. Subsequently, the modal testing was applied to determine the vibrational characteristics of specimens with ferrite-pearlite and spheroidized structures, which were identical in terms of size and weight. Experimental results indicated that the dispersion of spheroidized carbides in the ferritic matrix could increase natural frequencies and damping loss factors, such that changing the microstructure of specimens increased the natural frequency and damping loss factor of the first vibration mode by 0.4 (from 3732 to 3747 Hz) and 15%, respectively. Finally, a microstructure-based finite element model was developed to interpret experimental results. The representative volume element (RVE) was modeled using image processing and writing scripts in ABAQUS/CAE 2016. The statistical analysis of stresses calculated by finite element analysis confirmed the results obtained by experimental tests. The numerical results showed that changing microstructures led to considerable changes in stress statistical dispersion, although the mean stress value did not change. Ultimately, the approximate formula of stress-damping could explain significant changes in the damping loss factor.

Dynamic Characterization of Car Door and Hood Panels Using FEA and EMA

2013 ◽  
Vol 471 ◽  
pp. 89-96 ◽  
Author(s):  
Zahir Hanouf ◽  
Waleed F. Faris ◽  
Mohd Jailani Mohd Nor
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Modal Analysis ◽  
Dynamic Properties ◽  
Experimental Modal Analysis ◽  
Modal Testing ◽  
Dynamic Characterization ◽  
Element Analysis ◽  
Structural Dynamic

The dynamic characterization of vehicle structures is a crucial step in NVH analysis and helps in refining the vibration and noise in new vehicles. This paper investigates the dynamic properties of two parts of the vehicle structure which are door and hood panels. Theoretical modal analysis which is referred to as Finite Element Analysis (FEA) and Experimental Modal Analysis (EMA) or modal testing has been used as investigative tools. The paper investigates the structural dynamic properties of door and hood panels of a local car. ME'scope software was used to analyze the data obtained from Pulse to extract the dynamic properties of the panels. LS-DYNA software was used to analyze the dynamic behavior of the structure. The comparison between the results obtained from both analyses showed some similarity in frequencies and mode shapes. Finally the paper concludes that experimental modal analysis and finite element analysis can both be used to extract dynamic properties of structures.

Modal Finite Element Analysis of Double Rollers Plastic Calender Equipment

2013 ◽  
Vol 744 ◽  
pp. 157-160
Author(s):  
Yan Li ◽  
Peng Zhang ◽  
He Yong Qin
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Torsional Vibration ◽  
Vibration Mode ◽  
Simulation Method ◽  
Bending Vibration ◽  
Element Analysis ◽  
Inherent Frequency ◽  
Vibration Performance

This paper mainly targeted double roll calender equipment vibration problem of study, using numerical simulation method, investigated the rollers, stents and modal of the whole machine. Conclusion as follows: (1) for the rollers are concerned, turning to the rollers inherent frequency influence is small, can be ignored. (2) stents have not only the front and back, the or so direction of the bending vibration, and torsional vibration, these vibration will influence support the intensity and rigidity. (3) the whole machine is the main complex vibration mode, stents vibration performance for concurrently bending torsional vibration, with vibration frequency increases on the rollers showing torsional vibration.

Modal Analysis Calculation and Simulation of Ramming Chain

2014 ◽  
Vol 1055 ◽  
pp. 234-237
Author(s):  
Peng Cheng Yan ◽  
Chi Yu Hao ◽  
Hua Gang Sun ◽  
Chao Liu
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Vibration Mode ◽  
Element Model ◽  
Lateral Bending ◽  
Element Analysis ◽  
Analysis Calculation ◽  
Longitudinal Bending ◽  
The Finite Element Model ◽  
Main Deformation

In order to solve a problem that the running of ramming chain is unstable and master each order natural frequency and deformation characteristics of the chain, the method of theoretical calculation and finite element analysis with software ANSYS is used on the natural frequency of the calculation and analysis. By comparing the data obtained from two methods to verify the correctness of the finite element model, the model is used to analyze natural frequencies and corresponding vibration mode of the ramming chain. The results show that under the low order natural frequency, the main deformation of the ramming chain is the lateral bending, longitudinal bending and torsion deformation, so the results provide the basis to master the deformation of the chain.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

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