Study on the Natural Vibration Characteristics of Jointed Slope

2013 ◽  
Vol 690-693 ◽  
pp. 925-932
Author(s):  
Miao Wang ◽  
Hai Bo Li ◽  
Ya Qun Liu ◽  
Xiao Cheng Huang
Keyword(s):  
Natural Frequency ◽  
Structural Parameters ◽  
Vibration Characteristics ◽  
Resonance Phenomenon ◽  
Response Analysis ◽  
Seismic Load ◽  
Modal Shape ◽  
Earthquake Load ◽  
Structural Surface ◽  
Harmonic Response Analysis

Analysis of the vibration characteristics of slope is the basis of dynamic analysis of slope; therefore, it has an important engineering significance. In this paper, ideal joint rock slope was studied by the modal analysis and harmonic response analysis module in the ANSYS software, meanwhile, the section of the model size and the effects of the structural parameters on the vibration characteristics of slope were also discussed. The results show that the stiffness of the structural surface is the key factors that affect the vibration characteristics of slope, and with the stiffness of structural surface increases, the first modal shape of slope was changed from dislocation vibration that along the structural surface to horizontal vibration. Only the first natural frequency can be excited the "resonance" phenomenon in the horizontal direction under the seismic load. Therefore, the joint slope is more easily to be excited "resonance" under earthquake load because of the first natural frequency of joint slope is smaller than homogeneous slope; moreover, this is consistent to the investigation results of Wenchuan Earthquake.

The Finite Element Analysis and Optimization for the Grinder Based on the Joint Surface

2013 ◽  
Vol 281 ◽  
pp. 165-169 ◽  
Author(s):  
Xiang Lei Zhang ◽  
Bin Yao ◽  
Wen Chang Zhao ◽  
Ou Yang Kun ◽  
Bo Shi Yao
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Element Model ◽  
Joint Surface ◽  
Weak Links ◽  
Response Analysis ◽  
Element Analysis ◽  
Static And Dynamic Analysis ◽  
Harmonic Response Analysis ◽  
Grinding Machine

Establish the finite element model for high precision grinding machine which takes joint surface into consideration and then carrys out the static and dynamic analysis of the grinder. After the static analysis, modal analysis and harmonic response analysis, the displacement deformation, stress, natural frequency and vibration mode could be found, which also helps find the weak links out. The improvement scheme which aims to increase the stiffness and precision of the whole machine has proposed to efficiently optimize the grinder. And the first natural frequency of the optimized grinder has increased by 68.19%.

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.

Effects of Bearing Configuration on Spindle Dynamic Characteristics

2013 ◽  
Vol 437 ◽  
pp. 76-80
Author(s):  
Guo Ping An ◽  
Bing Bing Zhang ◽  
Yong Sheng Zhao ◽  
Li Gang Cai
Keyword(s):  
Modal Analysis ◽  
Natural Frequency ◽  
Analytical Model ◽  
Dynamic Characteristics ◽  
Response Analysis ◽  
Face To Face ◽  
Harmonic Response ◽  
Radial Stiffness ◽  
Proposed Model ◽  
Harmonic Response Analysis

This article investigates the effects of bearing configuration on the spindle dynamic characteristics. First, an analytical model of spindle is proposed and the bearing sets radial stiffness is calculated. Second, the spindle analytical model is developed to perform modal analysis and harmonic response analysis with ANSYS, and then obtain the natural frequency and FRF under different bearing configurations. The result suggests that bearing configuration has little effect on the natural frequency of spindle system and the FRF amplitude corresponding to the 1st natural frequency under back to back configuration or face to face configuration is relatively small. Finally, the proposed model is validated by modal experiment.

Dynamic Simulation and Analysis of Pipes of Air Conditioners

2013 ◽  
Vol 303-306 ◽  
pp. 2790-2793
Author(s):  
Zhong Min Wan ◽  
Ka Lin Su ◽  
Zu Yi Zheng ◽  
Jun Hua Wan ◽  
Jing Liu ◽  
...  
Keyword(s):  
Resonance Phenomenon ◽  
Response Analysis ◽  
Prototype Model ◽  
Piping System ◽  
Air Conditioner ◽  
Ansys Software ◽  
Modified Model ◽  
Air Conditioners ◽  
Harmonic Response Analysis ◽  
Better Than

It is essential to investigate the vibration properties of piping system in air conditioner. Finite Element Method is used to build the virtual prototype model of the air conditioner, and the dynamic responding analysis was conducted using ANSYS software. The modal analysis and harmonic response analysis was conducted for different modals and the results was compared. The simulation results showed that the vibration characteristics of modified model is better than that of the original model, thus resonance phenomenon could be avoided.

Structure Analysis of FTIR Infrared Spectrometer Based on ANSYS/Workbench

2012 ◽  
Vol 246-247 ◽  
pp. 189-193
Author(s):  
Zhao Ming Chen ◽  
Guo Tian He ◽  
Ji Ming He ◽  
Ze Yu Xu ◽  
Yuan Chang Lin ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Three Dimensional ◽  
Element Model ◽  
Response Analysis ◽  
Modal Shape ◽  
Harmonic Response ◽  
Infrared Spectrometer ◽  
Harmonic Response Analysis ◽  
Three Dimensional Finite Element ◽  
Ansys Workbench

The CAD software SolidWorks was used to create a three-dimensional finite element model of FTIR infrared spectrometer, and the model was imported into ANSYS/Workbench to modal analysis and harmonic response analysis. Through modal analysis, each order natural frequency and vibration shape were obtained. From modal shape analysis, all components of the stiffness strength and elastic deformation situation were got, and many times tests were carried to enhance stability of the structure and materials which had the most seriously deformation and direct effect impact to the quality of interferometer. The most sensitive frequency range of the system was concluded by harmonic response analysis, which provided a basis for further designing and improving of the spectrometer performance.

The Vibration Characteristics of the Hydropower Plant with a Certain Cross Flow Hydro-Turbine Generating Units and its Earthquake Response Analysis

2014 ◽  
Vol 577 ◽  
pp. 541-545
Author(s):  
Zhen Yu Ouyang
Keyword(s):  
Cross Flow ◽  
Element Model ◽  
Vibration Characteristics ◽  
Hydropower Plant ◽  
Earthquake Response ◽  
Response Analysis ◽  
Plant Structure ◽  
Hydro Turbine ◽  
Earthquake Load ◽  
Earthquake Response Analysis

To consider the safety of a certain cross flow hydro-turbine generating units and the hydropower plant, the finite element model of the plant and units are established by ANSYS, with which the resonance check is carried out. Meantime, the spectrum analysis method is used to present an earthquake response analysis according to the relative specifications, and the earthquake reaction condition in different directions of the characteristic monitoring points in main height is obtained, then the vibration characteristics of the hydropower plant and the effect of the earthquake load are analyzed. The research gives evidence and reference to make sure of the plant structure safety and the healthy operation for hydro-turbine.

A Harmonic Response Analysis of Food Refrigeration Compressor Based on Abaqus

2012 ◽  
Vol 215-216 ◽  
pp. 950-954
Author(s):  
Li Zhang ◽  
Shuo Zhang ◽  
Yuan Yuan Zhang ◽  
Yan Miao Ma
Keyword(s):  
Noise Reduction ◽  
Vibration Characteristics ◽  
Response Analysis ◽  
Acceleration Response ◽  
Vibration Displacement ◽  
Harmonic Response ◽  
Key Points ◽  
Harmonic Response Analysis ◽  
Abaqus Software ◽  
Refrigeration Compressor

A harmonic response analysis was conducted on semi-hermetic refrigeration compressor by Abaqus software. The vibration displacement and acceleration response spectrums of the compressor’s key points were obtained. The vibration characteristics of the compressor show that the harmonic response analysis result is consistent with the experimental one. The vibration of the compressor at 50Hz is the most dramatic. The first trough in each direction is found around 70Hz, and after that each direction’s acceleration goes up significantly. At the same time, the conclusion verifies the vibration of compressor’s bottom corners by LMS Test. Lab Signature Testing. The paper provides a scientific reference for the further study on vibration and noise reduction in food refrigeration compressors.

Dynamic Characteristics Research of Boring-Milling Ram Based on ANSYS

2013 ◽  
Vol 834-836 ◽  
pp. 1501-1504
Author(s):  
Luo Hong Deng ◽  
Zai Liang Chen ◽  
Zhen Dong Zhou
Keyword(s):  
Modal Analysis ◽  
Dynamic Characteristics ◽  
Stress Responses ◽  
Resonance Phenomenon ◽  
Response Analysis ◽  
Vibration Modes ◽  
Harmonic Load ◽  
Frequency Curve ◽  
Spindle Rotation ◽  
Harmonic Response Analysis

This paper carried out the modal analysis for ram based on ANSYS, and calculated the first six natural frequencies and vibration modes and finally verified that the dynamic incentive caused by the spindle rotation on the ram does not produce resonance phenomenon generally. By adding harmonic load, made the harmonic response analysis based on the modal analysis, calculated displacement and stress responses of the system under the action of the exciting force and obtained the dynamics and the frequency response curve, that is, amplitude-frequency curve which verified the ram can withstand various sine loads of different frequency. The dynamic characteristics were studied and the dynamic parameters were obtained after the studies above, which provide important foundation for the design and improvement of the machine ram structure.

scholarly journals Research on Vibration Characteristics of Piezoelectric Ceramic Atomizer Based on ANSYS

2019 ◽  
Vol 118 ◽  
pp. 02043
Author(s):  
Yan Chen ◽  
Chunyan Ma ◽  
Zaihe Shen ◽  
Rui Chen
Keyword(s):  
Resonant Frequency ◽  
Piezoelectric Ceramic ◽  
Vibration Mode ◽  
Simulation Analysis ◽  
Experimental Tests ◽  
Vibration Characteristics ◽  
Response Analysis ◽  
Element Analysis ◽  
Piezoelectric Coupling ◽  
Harmonic Response Analysis

In the design and application of ultrasonic atomizer, the resonant frequency and vibration mode of piezoelectric transducer have an effect on the working state and atomization effect of the atomizer. In order to deeply study the piezoelectric ceramic ultrasonic atomizer Vibration characteristics, piezoelectric coupling simulation analysis was performed by ANSYS software, multi-order vibration mode of piezoelectric ceramic atomization sheet obtained by modal analysis method, combined with harmonic response analysis to obtain resonant frequency of piezoelectric ceramic ultrasonic atomization sheet, and analysis the influence of the main size of the atomized sheet on the vibration mode. According to theoretical analysis and experimental tests, the effectiveness of the finite element analysis can be verified, and then provide a theoretical basis for the study of ultrasonic atomizers.

Natural Frequency Analysis of Liquid-Filled Tanks

2005 ◽  
Author(s):  
Rouzbeh Amini ◽  
Grant Warner ◽  
Hamid Nayeb-Hashemi
Keyword(s):  
Natural Frequency ◽  
Frequency Analysis ◽  
Natural Frequencies ◽  
Water Levels ◽  
Resonance Phenomenon ◽  
Modal Shape ◽  
Earthquake Excitation ◽  
Element Analysis ◽  
The Difference ◽  
Natural Frequency Analysis

Traditionally, the cantilever modal shape of liquid-filled tanks has been considered as the most critical mode. However, recent research has demonstrated that natural frequencies associated with some circumferential modes might be close to the frequency of earthquake excitation. This can lead to a resonance phenomenon, and consequently failure of the tanks. In this paper, we perform Natural Frequency Analysis of fluid-filled tanks, using finite element analysis. Modeling and solution employ ADINA potential-based flow elements, which require the assumption of inviscid, irrotational and incompressible flow. The problem is solved for different geometries and water levels of tanks; the results are compared with the current results in the literature and the difference is demonstrated.

Sign in / Sign up

Export Citation Format

Share Document