http://ccsenet.org/journal/index.php/mer/issue/feedMechanical Engineering Research2015-11-13T01:18:11-08:00Lily Greenmer@ccsenet.orgOpen Journal Systems<div style="width: 350; text-align: justify;"><p><em>Mechanical Engineering Research</em> is an international, double-blind peer- reviewed, open-access journal. <em>Mechanical Engineering Research</em> is published by the <a href="/web/">Canadian Center of Science and Education</a> in both print and online versions. The journal is striving to provide the best platform for researchers and scholars worldwide to exchange their latest findings. The scopes of the journal include, but are not limited to, the following topics:</p><ul><li>Thermal Engineering and Fluids Engineering</li><li>Mechanics</li><li>Kinematics, Dynamics, & Control of Mechanical Systems</li><li>Mechatronics, Robotics and Automation</li><li>Design, Manufacturing, & Product Development</li><li>Human and Machine Haptics</li></ul><p><span style="color: #111111; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 11px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background- color: #fbfbf3; display: inline !important; float: none;">Authors are encouraged to <strong><a href="/journal/index.php/mer/about/submissions">submit</a></strong> complete, unpublished, original, and full-length articles that are not under review in any other journals. 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For nano-scale wetting phenomena, we should consider the curvature effects of the surface tension and the line tension. However, previous works have not analyzed the influence of the curvature effects of the surface tension. In this manuscript, the nano-scale wetting phenomena of spherical droplets on smooth non-deformable substrates were studied by methods of thermodynamics. The total Helmholtz free energy total and the grand potential of this system are calculated. A generalized Young’s equation for wetting of spherical droplets with large enough radius is derived. It is shown that there exists a nonlinear relationship between the contact angle and the radii of droplets or the line tension.</p>2015-07-27T00:00:00-07:00Copyright (c) http://ccsenet.org/journal/index.php/mer/article/view/50919System Hazard Platform: Case Study NASA Field Joint Failure2015-11-12T07:03:30-08:00Kouroush Jenabjenabk@erau.eduJosh Herrinherrinj8@erau.eduSaeid Moslehpourmoslehpou@hartford.eduSam Khourysam.khoury@athens.edu<p class="1Body">NASA became overconfident with consecutive successful flights with no major failures leading up to Flight 25 of the Space Shuttle Challenger and failed to correctly apply quality assurance to reanalyze the possibilities of failure when extreme cold weather was present for what would become the last Challenger launch. System Hazard Analysis applied correctly to analyze the failure rate patterns of the NASA Space Shuttle Challenger Solid Rocket Booster field joints may have prevented the launch of the tragic Flight 25, where there was a total loss of aircraft and seven astronauts were killed in the accident. The steps of System Hazard Analysis will be explained that if followed may have provided the data necessary for NASA to correct the field joint error prior to instead of after the Challenger explosion.</p>2015-07-31T09:06:34-07:00Copyright (c) http://ccsenet.org/journal/index.php/mer/article/view/50171Derivation of Generalized Young’s Equation for Wetting of Cylindrical Droplets on Rough Solid Surface2015-11-12T07:03:30-08:00Xiao-Song Wangwangxs2016@163.com<p class="1Body">The surface tension depends on the radius of curvature of the liquid-vapor interface. For nano-scale wetting phenomena of cylindrical droplets, we should consider the curvature effects of the surface tension and the line tension. However, previous works have not analyzed the influence of the curvature effects of the surface tension. In this paper, we discuss the influence of the curvature effects of the surface tension on the contact angles based the Kim-Lee-Han-Park equation. The hydrophilic wetting of cylindrical droplets on rough and chemically homogeneous non-deformable substrates were studied by methods of thermodynamics. A generalized Young’s equation for wetting of cylindrical droplets on chemically homogeneous and rough non-deformable substrates was derived based on the thermodynamic equilibrium conditions. This equation reduces to the Wenzel equation if we ignore the influence of line tension. For contact angles of cylindrical droplets with sufficiently large radii, a generalized Young’s equations were derived considering the curvature effects of the surface tension.</p>2015-08-07T07:15:29-07:00Copyright (c) http://ccsenet.org/journal/index.php/mer/article/view/51966Incremental Inverse Kinematics of Wire-Suspended Parallel Mechanical System Taking into Account Many-Worlds Situation2015-11-12T07:03:30-08:00Kazuyuki Hanaharahanahara@cs.kobe-u.ac.jpWire-suspended platform is a parallel mechanical system consisting of a rigid platform and a number of length-adjustable wires. In order to deal with the kinematics of this type of mechanical system, we have to take into account the conspicuous characteristic of a wire that it can take only a tensile force. It has been demonstrated in the previous studies that this leads to plural possible kinematic states corresponding to a given set of wire lengths. In this study, we formulate an inverse kinematics problem in an incremental form based on the linearization of the kinematic relation of the system. Displacement of the mass center position of the platform is also taken into account for the articulation variables, in addition to the wire member lengths. A solution procedure that deals with the many-worlds situation is developed under the assumption of some adequate sensing devices. Numerical experiments based on computer simulation are carried out and the feasibility of the proposed approach is demonstrated with the attained kinematic motions of the simulated platform system.2015-08-07T00:00:00-07:00Copyright (c) http://ccsenet.org/journal/index.php/mer/article/view/50981Cableless In-piping Magnetic Actuator for Transportation over Long-range2015-11-12T07:03:30-08:00Tomohiro Izumikawayaguchi@mail.tohoku-gakuin.ac.jpRyuichi Watanabeyaguchi@mail.tohoku-gakuin.ac.jpHiroyuki Yaguchiyaguchi@mail.tohoku-gakuin.ac.jp<p class="1Body">This paper proposes a cableless In-piping magnetic actuator capable of locomotion over long range of 1,000 m within a pipe having an inner diameter of 10 mm. The cableless magnetic actuator is moved by using resonance energy of a mass-spring system excited by using an electromagnetic force. The proposed actuator incorporates a new type of an electrical inverter that directly transforms DC from button batteries into AC. The electrical DC-AC inverter incorporates a mass-spring system, two reed switches and two curved permanent magnets that switch under an electromagnetic force. The conventional DC-AC inverter and the newly proposed inverter were compared, and the effect of the inverter on the motive properties of the cableless magnetic actuator was examined. The influence of the consumption current of the battery on the range of the actuator was examined. Experimental result demonstrates that the cableless magnetic actuator was able to move horizontally at 1,588 m, and horizontal speed at 176.5 mm/s when two reed switches were used.</p>2015-10-13T11:46:25-07:00Copyright (c) http://ccsenet.org/journal/index.php/mer/article/view/54353Enhancement of the Capabilities of CNC Machines via the Addition of a New Counter boring Cycle with a Milling Cutter2015-11-12T07:03:30-08:00Adel Taha Mohamed Abbasatabbas1954@yahoo.com<p class="1Body">The operations of the machine, such as milling or drilling are the processes of shape transformation in which the metal is removed from the material stock to generate a part. The contact amongst the work piece and the generating tool creates substantial force. The study intends to examine and analyze different techniques of the model-based procedure control. Moreover, this research also aims at assessing a feature based approach, i.e., CNC approach. The program of CNC consists of a combination of machine specific instructions and machine specific codes. After reviewing the manuals of all modern CNC units from the different manufacturers, no efficient cycle was found for boring and counter-boring holes using a milling cutter. This research encapsulates the an investigation for the development of general programming algorithm, which is applied for boring or counter-boring many holes of different diameters using only one standard milling cutter. This algorithm has been integrated to produce a user-defined cycle (G888) and a subroutine for boring or counter-boring holes to achieve specific counter-bore diameters with accurate tolerance and good surface finishing. This programming algorithm can be equipped with our user-defined cycle (G881) to enable the machining of many counter-bore holes lying in a straight line (row/column/diagonal) or holes lying in regular or inclined matrix form. The algorithm can also be equipped with the presented user-defined cycle (G890) to machine counter-bore holes that form a circular pattern.</p>2015-10-24T00:00:00-07:00Copyright (c) 2015 Mechanical Engineering Researchhttp://ccsenet.org/journal/index.php/mer/article/view/54612Solutions of the Problems of a Viscoelastic Dynamic Contact between Smooth Curvilinear Surfaces of two Solid Bodies by the Application of the “Method of the Specific Forces”2015-11-12T07:03:30-08:00Nikolay Goloshchapovglshchpv@yahoo.co.uk<p class="1Body">Solutions of the problems of a viscoelastic dynamic contact between smooth curvilinear surfaces<strong> </strong>of two solid bodies by the application of the “Method of the specific forces” have been given in the article, and the new conception for the definition of the elastic and the viscous forces in the common case of dynamics of a viscoelastic contact is proposed here by the further development of this method. Essence of this method is that, the forces of viscosity and the forces of elasticity can be found by integration of the specific forces acting inside an elementary volume of the contact zone. It is shown here, that this method allows finding the viscoelastic forces for any theoretical or experimental dependencies between the distance of mutual approach of two solid bodies and the diameter of the contact area. Also, the derivation of the integral equations of the viscoelastic forces, the equations for pressure in the contact is presented. Viscoelastic dynamic contacts between two spherical bodies, and between a spherical solid body and a semi-space at impact have been examined. Work and Energy in the phases of compression and restitution, and at the rolling shear have been derived. Approximate solutions for the differential equations of movement (displacement) by using the method of equivalent work have been derived. Equations for the normal contact stresses have been obtained. Also, equations for kinematic and dynamic parameters of the viscoelastic collision have been derived in this article. Examples of the comparison of theoretical results and conclusions have been given in the paper.</p>2015-11-04T00:00:00-08:00Copyright (c) 2015 Mechanical Engineering Researchhttp://ccsenet.org/journal/index.php/mer/article/view/52220Thermodynamic Analysis of Different Configurations of Combined Cycle Power Plants2015-11-12T07:04:18-08:00Munzer S. Y. Ebaidmebaid2@philadelphia.edu.joQusai Z. Al-hamdanqusai.al-hamdan.perth@uhi.ac.uk<p class="1Body">Several modifications have been made to the simple gas turbine cycle in order to increase its thermal efficiency but within the thermal and mechanical stress constrain, the efficiency still ranges between 38 and 42%. The concept of using combined cycle power or CPP plant would be more attractive in hot countries than the combined heat and power or CHP plant. The current work deals with the performance of different configurations of the gas turbine engine operating as a part of the combined cycle power plant. The results showed that the maximum CPP cycle efficiency would be at a point for which the gas turbine cycle would have neither its maximum efficiency nor its maximum specific work output. It has been shown that supplementary heating or gas turbine reheating would decrease the CPP cycle efficiency; hence, it could only be justified at low gas turbine inlet temperatures. Also it has been shown that although gas turbine intercooling would enhance the performance of the gas turbine cycle, it would have only a slight effect on the CPP cycle performance.</p>2015-11-12T07:02:59-08:00Copyright (c) http://ccsenet.org/journal/index.php/mer/article/view/54841The Influence of Design Parameters on Straight Bevel Gear Dynamics2015-11-13T01:18:11-08:00Chiu-Fan Hsiehcfhsieh@nfu.edu.twYou-Qing Zhucfhsieh@nfu.edu.tw<p class="1Body">This study analyzes the influence of design parameters on the dynamics of straight bevel gears by constructing a model that allows variation in the shaft angle, pressure angle, and backlash. According to the statistical analysis, the order of influence of these parameters on weight is shaft angle > pressure angle > backlash. When the shaft angle is 90°, the statistical results show the drive is stable and the stress fluctuation level is low. The pressure angle, on the other hand, can affect the gear’s dynamic property by influencing the driving component force on the gear and the component force on the shaft. The results for the shaft and pressure angles are used to determine the appropriate backlash. Overall, the analysis not only provides designers with an important reference but explains the dominance in the market of gear designs with a 90° shaft angle and a 20° pressure angle.</p>2015-11-13T00:00:00-08:00Copyright (c) 2015 Mechanical Engineering Research