Vortex Visualization for Practical Engineering Applications

2006 ◽  
Vol 12 (5) ◽  
pp. 957-964 ◽  
Author(s):  
Monika Jankun-Kelly ◽  
Ming Jiang ◽  
David Thompson ◽  
Raghu Machiraju
Keyword(s):  
Engineering Applications ◽  
Practical Engineering

scholarly journals Dynamic Analysis of a Planar Hydraulic Rock-Breaker Mechanism with Multiple Clearance Joints

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Ke Chen ◽  
Guojun Zhang ◽  
Rui Wu ◽  
Li Wang ◽  
Hongmei Zheng ◽  
...  
Keyword(s):  
Hydraulic Cylinder ◽  
Dynamic Responses ◽  
Force Model ◽  
Engineering Applications ◽  
Mass System ◽  
Clearance Joints ◽  
Cylinder Model ◽  
Practical Engineering ◽  
Manufacturing Tolerances ◽  
Joint Clearances

Clearance exists in the joint of a mechanism because of the assemblage, manufacturing tolerances, wear, and other conditions, and it is a focus of research in the field of multibody dynamics. This study built a planar hydraulic rock-breaker model with multiple joint clearances by combining the hydraulic cylinder model, the clearance joints based on the Lankarani–Nikravesh contact force model, and the Lagrange multiplier method. Dynamic simulation results indicated that multiple clearance joints can degrade the dynamic responses of a rock-breaker model, which can be decomposed to rapid vibrations and slow movements. The rapid vibrations are excited by coupling the spring-mass system of hydraulic cylinder and clearances. The effects of the clearance size, input force, damping coefficient, and friction on the dynamic behaviour of the rock-breaker mechanism are also investigated. The friction could reduce the rapid vibration state significantly, which is feasible for practical engineering applications. As compared with the traditional models without clearances, the present model provides not only better predictions for the theoretical study of the hydraulic rock-breaker but also useful guidance for reducing the vibrations of the hydraulic rock-breaker in practical engineering applications.

Effect of Electrode Length on the Performance of EHD Gas Pump

2014 ◽  
Vol 598 ◽  
pp. 355-360 ◽  
Author(s):  
Y.T. Birhane ◽  
S.C. Lin ◽  
F.C. Lai
Keyword(s):  
Corona Discharge ◽  
Circular Pipe ◽  
Engineering Applications ◽  
Electrode Length ◽  
Practical Engineering

The effects of electrode length on the characteristics of flow induced by an electrohydrodynamic (EHD) gas pump in circular pipe have been experimentally examined in this study. The gas pump has a diameter of 61.8 mm and uses eight evenly spaced emitting electrodes which are flush mounted on the tube inner wall. The gap distance between emitting and ground electrodes is fixed at 25 mm and two emitting electrode lengths (15 mm and 40 mm) are considered. Experiments are conducted using positive corona discharge with voltage varying from 17.5 kV to 23 kV. Several important implications from the present results for practical engineering applications are presented.

Geometry Optimization and Engineering Applications of Transmission Tower Foundation in the Slope

2013 ◽  
Vol 423-426 ◽  
pp. 1243-1247
Author(s):  
Bin Peng ◽  
Xing Yun Wang ◽  
Yu Wang ◽  
He Huang
Keyword(s):  
Regression Analysis ◽  
Bearing Capacity ◽  
Geometry Optimization ◽  
Ultimate Bearing Capacity ◽  
Nonlinear Regression Analysis ◽  
Transmission Tower ◽  
Engineering Applications ◽  
Practical Engineering ◽  
Tower Foundation ◽  
Pile Length

Combining with practical engineering, geometry optimization and engineering applications of transmission tower foundation in the slope is researched by using the finite-difference software FLAC3D. The variation of the pullout, vertical and horizontal ultimate bearing capacity with the diameter and length of the pile is analyzed. And optimization program of actual project is given. Research shows that when the pile length is constant, the variation of the pullout and vertical ultimate bearing capacity is increasing with the diameter increasing significantly and the horizontal ultimate bearing capacity is not significant. When the diameter is constant, the pullout, vertical and horizontal ultimate bearing capacity is increasing with the length increasing significantly. By analyzing nonlinear regression analysis of calculation data, the formula of the ultimate bearing capacity is carried out, which can consider the different pile diameters and lengths. When the gradient and distance of slopes is constant, the pullout, vertical and horizontal ultimate bearing capacity can be carried out with the formula, which can provide a reference to specification revision and engineering.

The Comparative Analysis Research of the Finite Element between Sand Lining Teethed Pile and Smooth Pile

2014 ◽  
Vol 1030-1032 ◽  
pp. 905-907
Author(s):  
Xi Dong Wang ◽  
Yong Fen Ruan
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Bearing Capacity ◽  
Work Performance ◽  
Three Dimensional ◽  
Working Mechanism ◽  
Engineering Applications ◽  
Soil Displacement ◽  
Practical Engineering ◽  
Pile Settlement

Sand lining teethed pile is a new prestressed pile, and it has been gradually spread and used in Kun Ming of Yun Nan Province, meanwhile, it has achieved better work in practical engineering applications. Compared with common prestressed smooth pile, the working mechanism that tooth of the pile combines with the sand lining of the pile makes bearing capacity and the play speed of bearing capacity have significantly improved. This paper builds a three-dimensional entity pile base model with Midas GTS and analyzes the work performance of two kinds of precast piles from pile settlement and soil displacement around pile aspects. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

Theory and experimental research for the double ended tuning fork in MEMS

Sensor Review ◽  
2016 ◽  
Vol 36 (2) ◽  
pp. 217-224 ◽  
Author(s):  
Zhanshe Guo ◽  
Boyu Li ◽  
Yanshuai Gao ◽  
Fucheng Cheng ◽  
Le Cao
Keyword(s):  
High Performance ◽  
Tuning Fork ◽  
Ideal Theory ◽  
Laser Vibrometer ◽  
Engineering Applications ◽  
Content Type ◽  
Resonant Sensors ◽  
Practical Engineering ◽  
Generating System ◽  
Mechanical Characters

Purpose Being the key sensitive elements of the micro-electromechanical systems (MEMS) resonant sensors, performance of the double-ended tuning fork (DETF) will affect precision of the whole sensor greatly. Currently, most of the research on DETF is concentrated on ideal theory or simply mentioned as part of the sensor. But, in most engineering occasions, there exists many factors such as the additional mass, air damping and fabrication process, etc. However, few references are individually aimed at the mechanical characters of DETF. To choose the suitable DETF, it is important to solely research and measure the performance of this element. Design/methodology/approach In this paper, the authors combine the practical engineering applications and deduce the calculation method of sensitive element’s resonant frequency under various circumstances. The authors also design a force-generating system to make the loading simulation and verify the correctness of theory. Findings On the basis of Euler–Bernoulli theory and Rayleigh’s equation, frequency theories of DETF under four different situations have been deduced. A force-generating device is designed and fabricated to measure the mechanical characters of the DETF. The experiments using force-generating system, DETF, the high performance laser vibrometer and oscillograph are carried out. It verifies the correctness of theory. Originality/value Currently, most of the research on DETF is concentrated on ideal theory or simply mentioned as part of the sensor, and few references are individually aimed at the mechanical characters of DETF. Combining the practical engineering applications, the authors deduced the frequency theories of DETF. A force-generating system is designed and fabricated to measure the mechanical characters of the DETF, and the experiment results match the theoretical results very well.

scholarly journals A Novel Parametric Model for Nonlinear Hysteretic Behaviors with Strain Stiffening of Magnetorheological Gel Based on Fruit Fly Optimization Algorithm

2021 ◽  
Author(s):  
Guang Zhang ◽  
Zheng Zhang ◽  
Min Sun ◽  
Yang Yu ◽  
Jiong Wang ◽  
...  
Keyword(s):  
Optimization Algorithm ◽  
Optimal Solution ◽  
Fruit Fly ◽  
Parametric Model ◽  
Measure Data ◽  
Model Parameters ◽  
Fruit Fly Optimization Algorithm ◽  
Engineering Applications ◽  
Fruit Fly Optimization ◽  
Practical Engineering

Abstract Magnetorheological (MR) gel is a new branch of MR materials, which can overcome the phenomenon of particle agglomeration existing in MR fluid, thus improving the controllability of materials in engineering applications. In this paper, a novel parametric model for tracking the nonlinear hysteretic behaviors with strain stiffening of MR gel is constructed. The measure data in relative to the five current levels of 0A, 0.2A, 0.5A, 0.8A and 1A under the strain amplitude and frequency of 10% and 0.1Hz respectively are utilized to identify the parameters. The optimal solution for the model parameters is conduced employing the fruit fly optimization algorithm (FOA). The comparison study with two typical model such as Bouc-Wen model and viscoelastic-plastic model is conduced to to evaluate the effectiveness of the developed model. The model parameters are generalized with respect to the loading current, and the reliability of the generalized model is verified. The studies show that the proposed model can perfectly fit the strain stiffening and nonlinearity of sample, which can provide a theoretical basis for the semi-active control of MR gel in practical engineering applications.

scholarly journals Free Vibration Characteristics of Rectangular Membranes Assuming Rounded-Edges Boundary

Vibration ◽  
2019 ◽  
Vol 2 (3) ◽  
pp. 265-270 ◽  
Author(s):  
Ouakad
Keyword(s):  
Wave Propagation ◽  
Free Vibration ◽  
Numerical Method ◽  
Higher Order ◽  
Differential Quadrature ◽  
Engineering Applications ◽  
Complex Mode ◽  
Discretization Methods ◽  
Higher Order Modes ◽  
Practical Engineering

This study examines the vibratory characteristics of rectangular membranes having an outer rounded-edges periphery. This class of membranes with rounded outer corners has a great advantage over membranes with a rectangular platform wave propagation at the boundary being greatly diffused. As a result, such membranes have a great potential for use in practical engineering applications, especially in waveguides-based structures. Based on an effective 2D Differential-Quadrature numerical method, the frequencies and respective modeshapes of a rectangular membrane with rounded-edges are computed. This method is shown to yield better versatility, efficiency and less computational execution than other discretization methods. The simulated results, showing complex mode exchanges occurring for the higher order modes, demonstrate advantageous use for such membrane patterns in the design of tunable waveguides.

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