Study on the Structural Dynamic Characteristics of Sand Washing Tower Based on ANSYS

2014 ◽  
Vol 578-579 ◽  
pp. 850-853
Author(s):  
Kun Zhao ◽  
Wei Hua Zhu ◽  
Feng Zhu ◽  
Chun Lin Huang ◽  
Xia Hua
Keyword(s):  
Finite Element ◽  
Theoretical Calculations ◽  
Recurrence Formula ◽  
Structural Vibration ◽  
Structural Dynamic ◽  
Finite Element Software ◽  
Structural Problems ◽  
Tower Structure ◽  
Structural Dynamic Characteristics ◽  
Vibration Modal

In this paper, we depart from the basic vibration equation deduced from Vibro sand tower structure recurrence formula. Using ANSYS finite element software to simulate the red sand of the top ten tower structural vibration modal. Of which the first two modal solutions in accordance with the conventional prismatic cantilever closer to theoretical calculations, the results of the finite element solution proved authentic, we provide a theoretical basis for the use of finite element methods for solving the structural problems of sand washing tower.

Study on Micro-Fracture Chaotic Evolution under External Loading Rock

2013 ◽  
Vol 813 ◽  
pp. 355-358 ◽  
Author(s):  
Ting Ting Wang ◽  
Wan Chun Zhao ◽  
Yuan Hong Liu ◽  
Li Yang ◽  
Hong Yu Gao
Keyword(s):  
Finite Element ◽  
Chaos Theory ◽  
Formation Process ◽  
Theoretical Calculations ◽  
Growth Behavior ◽  
External Loading ◽  
Software Simulation ◽  
Finite Element Software ◽  
Fracture Formation ◽  
Simulation Results

In order to accurately describe the growth behavior of the micro-fracture under the action of the rock external load, this paper proposes the use of chaos theory to describe the fracture formation process, explains the chaotic characteristics of the fracture from the perspective of the growth of micro-fracture, the number of growth and fracture formation morphology, respectively. Selecting the practical block of an oilfield, the theoretical calculation and finite element software simulation results show that, theoretical calculations are accurate and reliable.

scholarly journals Experimental Study and Theoretical Analysis on Flexural Mechanical Propertiesof Reinforced Timber Beams

2018 ◽  
Vol 27 (1) ◽  
pp. 096369351802700
Author(s):  
Xiong Xueyu ◽  
Wang Yiqingzi ◽  
Xue Rongjun ◽  
Lu Xuanxing
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Failure Modes ◽  
Theoretical Calculations ◽  
Development Trend ◽  
Ultimate Bearing Capacity ◽  
Bending Test ◽  
Element Analysis ◽  
Finite Element Software ◽  
Reinforced Beams

As Chinese architecture masterpiece, ancient Hui-style architecture is the admiration for Chinese and foreign master builders. According to the bending test, the theoretical calculations and Abaqus finite element analysis on 5 Hui-style architecture beams, this paper points out the differences between un-reinforced beams and reinforced beams on ultimate bearing capacity, deflection and other performance indicators. The reinforcement methods of embedding steel bars, embedding CFRP bars and pasting CFRP plate can respectively improve the ultimate bearing capacity by 20.2%, 32.6% and 37.0%. Based on the plane section assumption and considering thereduction of tensile strength causedby wood knots and defects in tension zone, this paper predicts failure modes of the test beams may occur, and gives the ultimate bearing capacity of different failure modes. In addition, this paper uses the Abaqus finite element software for simulating test beams, and the development trend of load-deflectioncurve between the test and numerical simulation are in good agreement, providing reference for further research of Hui-style architecture.

scholarly journals A Study on Fluid Self-Excited Flutter and Forced Response of Turbomachinery Rotor Blade

2014 ◽  
Vol 2014 ◽  
pp. 1-20 ◽  
Author(s):  
Chih-Neng Hsu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Power Plants ◽  
Single Mode ◽  
Element Model ◽  
Forced Response ◽  
Structural Dynamic ◽  
Turbine Engine ◽  
Forcing Function ◽  
Structural Dynamic Characteristics

Complex mode and single mode approach analyses are individually developed to predict blade flutter and forced response. These analyses provide a system approach for predicting potential aeroelastic problems of blades. The flow field properties of a blade are analyzed as aero input and combined with a finite element model to calculate the unsteady aero damping of the blade surface. Forcing function generators, including inlet and distortions, are provided to calculate the forced response of turbomachinery blading. The structural dynamic characteristics are obtained based on the blade mode shape obtained by using the finite element model. These approaches can provide turbine engine manufacturers, cogenerators, gas turbine generators, microturbine generators, and engine manufacturers with an analysis system to remedy existing flutter and forced response methods. The findings of this study can be widely applied to fans, compressors, energy turbine power plants, electricity, and cost saving analyses.

scholarly journals Experimental and Numerical Research on Flow-Induced Vibration in Valves

2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Asmaa Ali Hussein
Keyword(s):  
Finite Element ◽  
Flow Rate ◽  
Vortex Shedding ◽  
Flow Characteristics ◽  
Operating Mode ◽  
Structural Vibration ◽  
Piping System ◽  
Flow Induced Vibration ◽  
Finite Element Software ◽  
Operation Conditions

Abstract   All central air conditioning systems contain piping system with various components, sizes, material, and layouts. If such systems in operating mode, the flow in piping system and its component such as valves can produce severe vibration due to some flow phenomenon’s. In this research, experimental measurements and numerical simulation are used to study the flow-induced vibration in valves. Computational fluid dynamics (CFD) concepts are included with one-way and two-way fluid-structure interaction concepts by using finite element software Package (ANSYS 14.57). Detection analysis is performed on flow characteristics under operation conditions and relations with structural vibration. Most of real geometrical, operational, and boundary conditions are simulated to obtain best similarity with real operation conditions. Comparisons performed between experimental data and numerical results (one-way and two-way simulation) to verify the results. The main conclusion was drawn from the study that the dominant source of vibration for valve is the water pulsation in addition to amount of water hammering. In addition, the main source of water pulsation in globe valve is the vortex shedding and pressure difference between upstream and downstream of valve. The vibration amplitude was increased with increasing flow rate until to be maximum when the flow rate around 30% and then decreased until flow rate reaches to around 85% and then trends to be constant. Keywords: Flow-induced vibration, vortex shedding, pressure pulsation, valve, finite element, ANSYS, fast Fourier transform (FFT).

scholarly journals Vibration Control of Tower Structure with Multiple Cardan Gyroscopes

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Haoxiang He ◽  
Xin Xie ◽  
Wentao Wang
Keyword(s):  
Degrees Of Freedom ◽  
Dynamic Control ◽  
Dynamic Responses ◽  
Structural Vibration ◽  
Structural Dynamic ◽  
Torsion Effect ◽  
Tower Structure ◽  
Rotational Degrees Of Freedom ◽  
Earthquake Action ◽  
Control Equation

Tower structure is sensitive to hurricane and earthquake, and it is easy to generate large deflection and dynamic response. The multiple cardan gyroscope has two rotational degrees of freedom, which can generate strong moments to constrain the two horizontal orthogonal deflections if the rotor operates in high speeds, so the structural dynamic responses can be decreased. Hence, the method of dynamic control of the tower structure under wind load and earthquake action is proposed by using the multiple cardan gyroscopes as the dampers. The dynamic mechanism and the fixed axis principle of the multiple cardan gyroscope are introduced, and the dynamic equation of the gyroscope is established. The damping mechanism of the gyroscope is also described. For the tower structure equipped with the multiple cardan gyroscope dampers, the multidimensional control equation considering torsion effect is established, and the equivalent state space equation is presented. Taking a TV Tower with a number of gyroscope dampers as an analysis example, the structural dynamic responses and damping performance under fluctuating wind loads and earthquake action is studied. The results show that the multiple cardan gyroscope dampers with suitable parameters can effectively decrease the structural vibration in horizontal directions and torsional direction.

Vibration Modal Analysis of DTG under Space Environment

2015 ◽  
Vol 757 ◽  
pp. 39-43
Author(s):  
Jian Feng Guo ◽  
Yi Na Feng ◽  
Yi Tao ◽  
Zhong Bao Qin ◽  
Chang Jiang Liu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Natural Frequencies ◽  
Element Model ◽  
Space Environment ◽  
Finite Element Software ◽  
Vibration Modal

Finite element model of dynamic tuned gyroscope (DTG) was founded using finite element software of ANSYS. Natural frequencies and vibration modalities of DTG in cases of both being static and rotating were studied respectively through the method of modal analysis, and also various vibration modalities influence on output of gyroscope was analyzed.

scholarly journals Simulation Study on the Blocking Effect and Vibration Reduction Characteristics of Acoustic Black Hole in Thin Plate

2020 ◽  
Vol 6 (4) ◽  
pp. 223-231
Author(s):  
Z. Liu ◽  
Y. Zhou ◽  
A. Golyanin
Keyword(s):  
Finite Element ◽  
Black Hole ◽  
Noise Reduction ◽  
Thin Plate ◽  
Vibration Reduction ◽  
Structural Vibration ◽  
Energy Concentration ◽  
Element Analysis ◽  
Finite Element Software ◽  
Reduction Effect

Recently, more and more scholars have devoted themselves to researching new methods of vibration reduction and noise reduction by manipulating the elastic waves in the structure to achieve the purpose of vibration reduction and noise reduction. To this end, a new type of ‘acoustic black hole’ structure is proposed, which reduces structural vibration while avoiding problems such as mass increase. In this paper, the vibration damping performance of the structure is mainly calculated by finite element software, and the energy concentration effect of the thin plate containing the acoustic black hole is verified by finite element analysis. A thin plate structure with four acoustic black holes is proposed. The calculation shows that the structure has obvious vibration reduction effect, and the vibration reduction effect can reach more than 20dB at high frequency.

Study on Dynamic Design Technique of Machine Tools Structure Based on Energy Balance

2010 ◽  
Vol 139-141 ◽  
pp. 792-796
Author(s):  
Nan Nan Zhang ◽  
Ze Yu Weng ◽  
Yan Qin Zheng ◽  
Yong Cai
Keyword(s):  
Finite Element ◽  
Energy Balance ◽  
Energy Distribution ◽  
Dynamic Characteristics ◽  
Machine Tools ◽  
Design Technique ◽  
Structural Dynamic ◽  
Dynamic Design ◽  
Structural Dynamic Characteristics ◽  
Grinding Machine

The energy balance of system is one of the basis for the dynamic design of machine tools structure. The paper applied finite element technique to machine tools dynamic design based on the energy balance, in view of finite element model of machine tools dynamics structure, mean squared deviation of various energy distribution was used to describe the structural dynamic characteristics quantitatively, and the method was combined with structural dynamic optimal theory to establish the improvemental direction. The author applied the technique to the structural dynamic characteristics analysis of a surface grinder, through the energy distribution analysis and quantitative analysis of structural dynamic characteristics of the grinding machine tools, the weak link of the grinding machine structure was found, which had instruction function for structure optimization of the grinding machine.The result proved this structure dynamics design technique had obvious superiority.

scholarly journals Study on Human-structure Dynamic Interaction in Civil Engineering

2018 ◽  
Vol 38 ◽  
pp. 03013
Author(s):  
Feng Gao ◽  
Li Lin Cao ◽  
Xing Hua Li
Keyword(s):  
Dynamic Characteristics ◽  
Civil Engineering ◽  
Dynamic Interaction ◽  
Structural Vibration ◽  
Structural Dynamic ◽  
Structure Interaction ◽  
Load Models ◽  
Advantages And Disadvantages ◽  
Structure Dynamic ◽  
Structural Dynamic Characteristics

The research of human-structure dynamic interaction are reviewed. Firstly, the influence of the crowd load on structural dynamic characteristics is introduced and the advantages and disadvantages of different crowd load models are analyzed. Then, discussing the influence of structural vibration on the human-induced load, especially the influence of different stiffness structures on the crowd load. Finally, questions about human-structure interaction that require further study are presented.

Study of Passive Vibration Absorbers Attached on Beam Structure

2014 ◽  
Vol 660 ◽  
pp. 511-515 ◽  
Author(s):  
Izzuddin Zaman ◽  
Muhammad Mohamed Salleh ◽  
Maznan Ismon ◽  
Bukhari Manshoor ◽  
Amir Khalid ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Natural Frequency ◽  
Structural Vibration ◽  
Mode Shapes ◽  
Small Scale ◽  
Vibration Absorber ◽  
Vibration Absorbers ◽  
Element Analysis ◽  
Structural Dynamic

Structural vibration is undesirable, wasting energy and possibly leading to excessive deflections and structure and machine’s failure. In order to reduce structural vibration, one of the common way is considering vibration absorber system attach to the structure. In this study, a vibration absorber is developed in a small scale size. The host structure selected for the study is a fixed-fixed ends beam. The effectiveness of vibration absorbers attached to a beam is investigated through experimental study. In prior to experiment, a finite element analysis of Solidworks® and analytical equations of Matlab® are produced in order to determine the structural dynamic response of the beam, such as the natural frequency and mode shapes. The preliminary results of finite element analysis demonstrate that the first five natural frequency of fixed-fixed end beam are 17Hz, 46Hz, 90Hz, 149Hz and 224Hz, and these results are in agreement with the beam’s analytical equations. However, there are slight discrepancies in experiment result due to noise and error occurred during the setup. In the later stage, the experimental works of beam are performed with attached vibration absorber. Result shows that the attachment of vibration absorber produces better outcome, which is about 45% vibration reduction. It is expected that by adding more vibration absorber to the structure, the vibration attenuation can significant.

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