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Vibration Analysis of Non-uniform Beams Resting on Two Layer Elastic Foundations Under Axial and Transverse Load Using (GDQM)
Ramzy M. Abumandour,
Islam M. Eldesoky,
Mohamed A. Safan,
R. M. Rizk-Allah,
Fathi A. Abdelmgeed
Issue:
Volume 5, Issue 2, April 2017
Pages:
70-77
Received:
1 January 2017
Accepted:
19 January 2017
Published:
4 March 2017
Abstract: The natural frequencies of non-uniform beams resting on two layer elastic foundations are numerically obtained using the Generalized Differential Quadrature (GDQ) method. The Differential Quadrature (DQ) method is a numerical approach effective for solving partial differential equations. A new combination of GDQM and Newton’s method is introduced to obtain the approximate solution of the governing differential equation. The GDQ procedure was used to convert the partial differential equations of non-uniform beam vibration problems into a discrete eigenvalues problem. We consider a homogeneous isotropic beam with various end conditions. The beam density, the beam inertia, the beam length, the linear (k1) and nonlinear (k2) Winkler (normal) parameters and the linear (k3) Pasternak (shear) foundation parameter are considered as parameters. The results for various types of boundary conditions were compared with the results obtained by exact solution in case of uniform beam supported on elastic support.
Abstract: The natural frequencies of non-uniform beams resting on two layer elastic foundations are numerically obtained using the Generalized Differential Quadrature (GDQ) method. The Differential Quadrature (DQ) method is a numerical approach effective for solving partial differential equations. A new combination of GDQM and Newton’s method is introduced t...
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Temperature Resistance of the Boundary Lubrication Layers Under Rolling with Slippage Condition
Tareq M. A. Al-Quraan,
Oksana O. Mikosyanchik,
Rudolph G. Mnatsakanov
Issue:
Volume 5, Issue 2, April 2017
Pages:
78-86
Received:
9 February 2017
Accepted:
21 February 2017
Published:
7 March 2017
Abstract: The influence of slip velocity at rolling with slippage on the intensity of heat release in the local contact at different modes of lubricating action was examined. Efficiency of using different procedures for calculating a temperature increase in the friction contact under conditions of dominating elastohydrodynamic and boundary modes of lubricating action was shown. The interrelation between the processes of heat release intensity in tribotechnical contact and wear of friction pairs was established. It was analyzed that the locality of the increased wear in the central section of the contact line is determined by a change in the stress–strained surface condition at friction and by the occurrence of stress concentrator center.
Abstract: The influence of slip velocity at rolling with slippage on the intensity of heat release in the local contact at different modes of lubricating action was examined. Efficiency of using different procedures for calculating a temperature increase in the friction contact under conditions of dominating elastohydrodynamic and boundary modes of lubricati...
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Dynamics of Planar Five-Link Hinged RRRRT Type Mechanism with Two Degrees of Freedom
Nodar Davitashvili,
Otar Gelashvili
Issue:
Volume 5, Issue 2, April 2017
Pages:
87-94
Received:
28 January 2017
Accepted:
28 February 2017
Published:
18 March 2017
Abstract: The paper dwells on dynamic study of a 2-DOF planar five-link mechanism of RRRRT type. There is described the kinematic analysis of the mechanisms, by means of the results of which the formulas of kinetic energy, the reduced moment and the reduced force have been derived, and the non-linear differential equations of motion of second kind determining the motions, velocities and accelerations of the input links of a mechanisms have been obtained. The paper describes the example of solving the dynamic problem. The results obtained for the ideal and real mechanisms are shown in graphs.
Abstract: The paper dwells on dynamic study of a 2-DOF planar five-link mechanism of RRRRT type. There is described the kinematic analysis of the mechanisms, by means of the results of which the formulas of kinetic energy, the reduced moment and the reduced force have been derived, and the non-linear differential equations of motion of second kind determinin...
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A New Approach to Manage Welding Quality in Supply Chain Networks: A Supplier Network Complaints Perspective
Jenni Toivanen,
Harri Eskelinen,
Paul Kah,
Jukka Martikainen,
Pia Heilmann
Issue:
Volume 5, Issue 2, April 2017
Pages:
95-106
Received:
21 February 2017
Accepted:
3 March 2017
Published:
28 March 2017
Abstract: This study presents a five-step method for analysis of supply chain networks from the perspective of the welding quality of manufactured products. The presented approach gives tools to take care of welding quality assessment in supply chain networks. The study uses data based analysis of complaints data and survey results to provide information that may assist managerial decision-making and supplier-related marketing activities. The results reflect the importance of information sharing as a means to reduce the number of complaints and show that combining production data and information about the production offers potential for manufacturing quality development in the supply chain network. The study uses applied RACI matrix and the case of a welding supply chain network to establish the findings. The case example discusses the observations dealing with GMAW process.
Abstract: This study presents a five-step method for analysis of supply chain networks from the perspective of the welding quality of manufactured products. The presented approach gives tools to take care of welding quality assessment in supply chain networks. The study uses data based analysis of complaints data and survey results to provide information tha...
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Design, Manufacture and Performance Evaluation of an Effective Dual Operated Groundnut Decorticator with Blower
Enoch Asuako Larson,
Philip Yamba,
Anthony Akayeti,
Samuel Adu-Gyamfi
Issue:
Volume 5, Issue 2, April 2017
Pages:
107-111
Received:
27 February 2017
Accepted:
9 March 2017
Published:
28 March 2017
Abstract: A manual (hand operated or bicycle paddle) groundnut decorticating machine attached with a blower is designed, manufactured and its performance assessed. The main components of the machine were the frame, hopper, neck feed control gate, shelling drum, shaft running on bearings, a pneumatic type mechanism, concave sieve and a blower. The rest are pulley and sprocket, discharge outlet and belt drive. The assembled angle iron parts were welded together whiles the sheet metal parts were riveted to hold in position. Testing of the decorticating machine was assessed at three different moisture contents of groundnut (0, 5.1 and 9.3%) and three different levels of machine shaft speed (10, 20 and 30 rpm) all at an average feed rate of 25kg/hr. The results revealed that the decorticating machine’s optimum performance was at 20 rpm machine shaft speed with groundnut moisture content of 0% (purely dry), machine cracking efficiency and percentage groundnut fully cracked was 71.2% and 85.3% respectively. There was reduction in machine performance at machine speeds of 10 rpm and 30 rpm with 45.1%, and 49.7% machine cracking efficiency respectively for the same feed gate rate openings. This was because at a speed of 10 rpm, the nuts were partially cracked (41.6%) and that of 30 rpm and cracked (39.3%), the quantum of groundnut losses through the blower increased considerably leading to a reduction in the quantity of groundnut collected.
Abstract: A manual (hand operated or bicycle paddle) groundnut decorticating machine attached with a blower is designed, manufactured and its performance assessed. The main components of the machine were the frame, hopper, neck feed control gate, shelling drum, shaft running on bearings, a pneumatic type mechanism, concave sieve and a blower. The rest are pu...
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Research on Time-Variant Wear Reliability of Gear Rack
Chen Li,
Wang Decheng,
Liu Hongqi,
Cheng Peng,
Shao Chenxi
Issue:
Volume 5, Issue 2, April 2017
Pages:
112-117
Received:
21 April 2017
Published:
21 April 2017
Abstract: In this paper, a gear rack of a ship lift is taken as an example. This paper presents a method for analyzing the reliability of gear and rack movement under the influence of time-varying wear. The example of large modulus gear rack mechanism for ship lift is verified. Through the wear state of rack and pinion, the time dependent reliability equation of kinematic pair is established with the consideration of the original dimension error, gap error and wear effect. Based on the Archard wear model, the hardness and other factors under the influence of time variation are analyzed and the new kinematic pair model is established. Finally, the Matlab software is used to simulate the wear process of the rack and pinion. The influence degree of the above factors on the motion reliability of mechanism is analyzed. The results of simulation and analysis show that the method is more accurate and suitable for engineering application. It provides an important reference for the life prediction of gear rack and the development of maintenance and maintenance outline.
Abstract: In this paper, a gear rack of a ship lift is taken as an example. This paper presents a method for analyzing the reliability of gear and rack movement under the influence of time-varying wear. The example of large modulus gear rack mechanism for ship lift is verified. Through the wear state of rack and pinion, the time dependent reliability equatio...
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Numerical Simulation of Heat Transfer Performance of Calender Roll Structure in Glass Calendering
Geng Tie,
Sheng Jie,
Hu Jinzhong
Issue:
Volume 5, Issue 2, April 2017
Pages:
118-128
Received:
10 May 2017
Published:
10 May 2017
Abstract: This paper analyzes the heat transfer characteristics of Heat transfer characteristics during photovoltaic glass calendering, establish the forming process numerical simulation equation, adopt Computational Fluid Dynamics(CFD) numerical simulation method, by introducing reasonable simplification and hypothesis, a mathematical model for the flow and heat transfer of cooling water In different structure calendering roll cavity was established. The effect of the cooling water channel structure on the heat transfer performance of the calender roll was analyzed by FLUENT simulation results.
Abstract: This paper analyzes the heat transfer characteristics of Heat transfer characteristics during photovoltaic glass calendering, establish the forming process numerical simulation equation, adopt Computational Fluid Dynamics(CFD) numerical simulation method, by introducing reasonable simplification and hypothesis, a mathematical model for the flow and...
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