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design AND VERIFICATION OF BOBSLEIGH TRACK

引用

10th asme biennial conference on engineering systems design and analysis

作者： Braghin, Francesco Cheli, Federico Melzi, Stefano Sabbioni, Edoardo Politecn Milan Dept Mech Engn Milan Italy

ISBN: (纸本)9780791849187

the design of new bobsleigh track is a challenging and difficult task since it requires several competences ranging from the physics of ice to civil engineering, from dynamics to tribology. thus, presently, only very few companies are able to correctly design a bobsleigh track. Moreover, during the construction phase, unshared approximations, imposed by the orography and geology of the location, are adopted by the constructor. this leads to tracks that are usually characterized by unpredicted accelerations on the athletes (sometimes even above accepted standards). the following paper deals with the development of a simple though precise virtual tool for the prediction of both the speed (acceleration) profile and the trajectory of a bobsleigh able to easily account for the effects of small track profile changes. therefore, this tool could be profitably used by both designers and constructors to avoid the necessity of "adjusting" the track once built.

关键词： Physics Trajectories (Physics) Approximation Dynamics (Mechanics) Civil engineering Ice design Construction Tribology

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SLIDING MODE CONTROL APPLICATION TO AMPLITUDE CONTROL OF COMB-ACTUATED RESONANT MICROSCANNERS

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10th asme biennial conference on engineering systems design and analysis

作者： Abtahi, Mansour Vossoughi, Gholamreza Sharif Univ Technol Dept Mech Engn Ctr Excellence Design Robot & Automat CEDRA Tehran Iran

ISBN: (纸本)9780791849194

MOEMS (Micro-Opto-Electro-Mechanical System) are MEMS in which the optical part plays a dominant role. the use of MOEMS as scanners and projectors has been studied lately. For high speed scanning applications, electrostatic comb drive actuation has several advantages. In this paper, we demonstrate the application of sliding mode control scheme for amplitude control of comb-actuated resonant microscanners. this method that leads to a simple and practical control function is simply extendable for microscanners with other type of actuation and even for any kind of oscillators that need amplitude control. the functionality and performance of the presented scheme is verified using numerical.

关键词： Resonance Sliding mode control Microelectromechanical systems Microoptoelectromechanical systems

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design OF A FRANCIS TURBINE FOR A SMALL HYDRO POWER PROJECT IN TURKEY

引用

10th asme biennial conference on engineering systems design and analysis

作者： Celebioglu, Kutay Okyay, Gizem Yildiz, Mehmet Galaksi Design & Consulting Co Ltd METU Technopolis Ostim TR-06531 Ankara Turkey

ISBN: (纸本)9780791849170

Many hydro power plants, both in small and large scales, are being constructed in Turkey. the total potential of these projects reach to 216 billion kWh of feasible energy. However a method was not yet developed for the design of hydraulic machinery equipment in Turkey. In order to accomplish the hydraulic turbine design without any prior information than the design parameters of the hydraulic project, a methodology is developed. this methodology involves the use of computational tools and it is applied for small hydro projects. this methodology is a parametric design-optimization procedure which consists of parametric geometry modeling, computational fluid dynamics analysis and structural verification.

关键词： Hydraulic equipment Hydraulic turbines Optimization Modeling design Francis turbines Geometry Power stations Computational fluid dynamics

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Stress analysis of an Isotropic Plate Containing three Aligned Circular Holes under In-Plane Symmetric Loading

引用

10th asme biennial conference on engineering systems design and analysis

作者： Asmar, Ghazi H. Chakar, Elie A. Notre Dame Univ Dept Mech Engn Zouk Mikhael Lebanon

ISBN: (纸本)9780791849163

this paper presents a method for the calculation of the stresses around three non-intersecting identical circular holes in a row, in a thin and infinite isotropic plate subjected to in-plane longitudinal, transverse or biaxial tension at infinity. the calculation of the stresses around any of the three holes is obtained in terms of the stresses that would exist around and at the center of the contour of a third would-be hole in the plate, initially, containing two holes. the results from the present method are compared to finite element as well as to published results in the literature. It is seen that the method yields satisfactory results at key points around the contour of the holes.

关键词： Finite element analysis Stress analysis (engineering) Stress Tension

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the Virtual Laboratory of Program Control

引用

10th asme biennial conference on engineering systems design and analysis

作者： Kostal, Peter Mudrikova, Andrea Caganova, Dagmar Slovak Tech Univ Bratislava Fac Mat Sci & Technol Trnava Slovakia

ISBN: (纸本)9780791849163

In this paper is described the main ideas of national project "KEGA 3/7131/09 - Laboratory of production system program control". this project is focused to build of virtual laboratory and supplemental e-learning documents for several studying subject at our institute. this project being solved in the Institute of Production systems and Applied Mechanics, Faculty of Materials Science and Technology - STU in years 2009-2011 includes an opportunity to acquire and improve abilities and skills the employers expect technical university graduates to have. the project target is to create a virtual laboratory of programmable control systems and a suitable teaching system supporting creation and improvement of key and occupational competences, abilities and skills of students in technical fields of study promoting at the same time their preparation for practice and lifelong education.

关键词： Manufacturing systems engineering mechanics Control systems Education Teaching Materials science Students

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A MECHATRONIC design PROCESS FOR thREE AXIS SERIAL ROBOTS

A MECHATRONIC DESIGN PROCESS FOR THREE AXIS SERIAL ROBOTS

引用

10th asme biennial conference on engineering systems design and analysis

作者： Karagulle, Hira Akdag, Murat Malgaca, Levent Dokuz Eylul Univ Dept Mech Engn TR-35100 Bornova Turkey

ISBN: (纸本)9780791849170

three axis serial robots with different sizes are widely used for pick and place, welding and various operations in industry. Developments in mechatronics, which is the synergistic integration of mechanism, electronics and computer control to achieve a functional system, offer effective solutions for the design of such robots. the mechatronic design process involves solid modeling, assembly, rigid body dynamics, finite element rigidity analysis, motion control and computer programming. In this study, Solid Works, Cosmos Motion, Cosmos Works and PC-based motion control programs are used with an integrated approach. the integration software is developed in VisualBASIC by using the application programming interface (API) capabilities of these programs. An experimental three axis serial robot with a reach distance of 790 mm has been produced to develop and test the process.

关键词： Machine design

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SINGULARITY REDUCTION OF A 3-UPS MECHANISM WIth 6 DOF FOR HAPTIC APPLICATIONS

SINGULARITY REDUCTION OF A 3-UPS MECHANISM WITH 6 DOF FOR HA...

引用

10th asme biennial conference on engineering systems design and analysis

作者： Vossoughi, G. R. Khodabakhsh, M. Sharif Univ Technol Dept Mech Engn Ctr Excellence Design Robot & Automat CEDRA Tehran Iran

ISBN: (纸本)9780791849170

A method for singularity reduction in a triangular 3-UPS mechanism is discussed. this mechanism usually has singularity near the origin. Changing the active joint angle can arrive at a suitable workspace near the origin without any singularity. Moreover, a 4-UPS mechanism, based on adding one additional leg to the 3-UPS mechanism, has a larger singular free workspace. Moreover, force analysis of two different mechanisms shows a reasonable and consistent force distribution between the different actuators. Singular free workspace is one of the characteristics which makes this mechanism ideal for haptic applications.

关键词： Haptics Actuators

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Numerical and Experimental Investigation of thermodynamic Behavior of Positive Displacement Compressor

Numerical and Experimental Investigation of Thermodynamic Be...

引用

10th asme biennial conference on engineering systems design and analysis

作者： Paknezhad, Morad Yousefi, Tooraj Sadeghi, Sajjad Ahmadi, Mehran Razi Univ Dept Mech Engn Kermanshah Iran

ISBN: (纸本)9780791849156

A numerical model, based on dynamic mesh, has been developed by FLUENT software, to simulate behavior of a positive displacement compressor. Only first compression stage of compressor was modeled. Modeling was done, by dividing the domain to three areas with different type meshes. Some relations were presented for volumetric, mechanical, isothermal, and overall isothermal performance, and thermodynamic analysis has been performed in term of these relations. Effects of outlet pressure and crankshaft's angular velocity have been investigated on work, polytropic factor of compression, and efficiency. Numerical and experimental results have been compared, and a good agreement was seen between them.

关键词： Reciprocating Compressor thermodynamic analysis Fluent Software Dynamic behavior

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SENSITIVITY analysis OF thE RECTANGULAR TRENCHES EMPLOYED IN SUPPRESSION OF thE HIGH-SPEED TRAIN-INDUCED GROUND VIBRATIONS

引用

10th asme biennial conference on engineering systems design and analysis

作者： Younesian, Davood Sadri, Mehran Iran Univ Sci & Technol Sch Railway Engn Tehran *** Iran

ISBN: (纸本)9780791849194

Ground vibrations generated by high-speed trains are studied in this paper. Open trenches are included in modeling and the problem is formulated using elasticity theory. the ground is modeled by a semi-infinite domain and the embankment with finite layers and the high-speed train is simulated by moving loads. the analytical solution is obtained in frequency domain and the peak particle velocity (PPT) is then achieved for different types of open trenches with different aspect ratios and distance from the track centerline. A parametric study is then carried out and effects of different parameters including the train speed and ground properties on vibration reduction factors are investigated.

关键词： Particulate matter Elasticity Vibration Modeling Trains Pavement live loads Sensitivity analysis Levees

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FINITE ELEMENT analysis OF FULL PENETRATION AND FILLET WELDS IN CANTILEVER BEAMS

引用

10th asme biennial conference on engineering systems design and analysis

作者： Mirzaali, M. Sattarifar, I. Tarbiat Modares Univ Dept Mech Engn Tehran Iran

ISBN: (纸本)9780791849187

Beams in engineering structures are mainly jointed together by welding. In general, they are imposed to static and dynamic loads. thus, analyses of welds are very important to study their behaviours. In this study finite element analyses of welds in the cantilever box beams are performed using the ANSYS program. Two different types of weld are considered;full penetration welds and fillet welds. Stress distributions in different paths are calculated for both types. It is shown that using of full penetration welds in a structure leads to safer welds than using of fillet welds. In addition, effects of different parameters such as fillet weld leg, weld material, thickness of cantilever box beam, and amount of its penetration in beam are studied.

关键词： Welded joints Cantilever beams Finite element analysis Structures Stress Cantilevers Welding

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