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A comparative 1D analysis of PEM, so and DB fuel cells 12

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Perez-Raya, Isaac Ellis, Michael W. Hernandez-Guerrero, Abel Elizalde-Blancas, Francisco Gonzalez-Valle, Carlos U. Lorenzini-Gutierrez, Luis D. Department of Mechanical Engineering University of Guanajuato Salamanca-Guanajuato Mexico Department of Mechanical Engineering Virginia Polytechnic Institute BlacksburgVA United States

ISBN: (纸本)9780791845844

Although fuel cells represent an attractive alternative for electricity generation, different technical problems, such as the hydrogen storage, have not been solved, as yet. Nowadays direct sodium borohydride fuel cells are considered as a promising technology since NaBH4 (fuel) is a stable, nonflammable and nontoxic liquid solution. In the present study a one-dimensional numerical study of a proton exchange membrane, a solid oxide, and a direct sodium borohydride fuel cell is performed. the objective of this work is to compare qualitatively the fuel cell performance between these technologies. For proton exchange membrane and solid oxide fuel cells there are already established useful models and correlations widely known, and used, to predict the current density and the power generated. Direct Borohydride fuel cells, on the other hand, are still in their early developments;in the present paper DBFCs are analyzed using a novel model. this proposed model for DBFCs includes the prediction of the NaBH4 oxidation in the anode side, the H2O2 reduction in the cathode side and the effect of the solution concentration and temperature on the membrane. It is noteworthy mentioning that this last effect has not been integrated in any of the established models in the current technical literature. Copyright © 2014 by asme.

关键词： Sodium Borohydride

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Comparing interface elements on a tablet for intuitive teleoperation of a mobile manipulator 12

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asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Lopez, David A. Frank, Jared A. Kapila, Vikram Mechatronics and Controls Laboratory Department of Mechanical and Aerospace Engineering NYU Polytechnic School of Engineering BrooklynNY11201 United States

ISBN: (纸本)9780791845851

As mobile robots experience increased commercialization, development of intuitive interfaces for human-robot interaction gains paramount importance to promote pervasive adoption of such robots in society. Although smart devices may be useful to operate robots, prior research has not fully investigated the appropriateness of various interaction elements (e.g., touch, gestures, sensors, etc.) to render an effective human-robot interface. this paper provides overviews of a mobile manipulator and a tablet-based application to operate the mobile manipulator. In particular, a mobile manipulator is designed to navigate an obstacle course and to pick and place objects around the course, all under the control of a human operator who uses a tabletbased application. the tablet application provides the user live videos that are captured and streamed by a camera onboard the robot and an overhead camera. In addition, to remotely operate the mobile manipulator, the tablet application provides the user a menu of four interface element options, including, virtual buttons, virtual joysticks, touchscreen gesture, and tilting the device. To evaluate the intuitiveness of the four interface elements for operating the mobile manipulator, a user study is conducted in which participants' performance is monitored as they operate the mobile manipulator using the designed interfaces. the analysis of the user study shows that the tablet-based application allows even non-experienced users to operate the mobile manipulator without the need for extensive training. Copyright © 2014 by asme.

关键词： Manipulators

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SBAT: A stochastic BPMN analysis tool 12

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asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Herbert, Luke T. Hansen, Zaza Jacobsen, Peter DTU Compute Technical University of Denmark Building 303B LyngbyDK-2800 Denmark DTU Management Technical University of Denmark Building 424 LyngbyDK-2800 Denmark

ISBN: (纸本)9780791845851

this paper presents SBAT, a tool framework for the modelling and analysis of complex business workflows. SBAT is applied to analyse an example from the Danish baked goods industry. Based upon the Business Process Modelling and Notation (BPMN) language for business process modelling, we describe a formalised variant of this language extended to support the addition of intention preserving stochastic branching and parameterised reward annotations. Building on previous work, we detail the design of SBAT, a software tool which allows for the analysis of BPMN models. Within SBAT, properties of interest are specified using the temporal logic Probabilistic Computation Tree Logic (PCTL) and we employ stochastic model checking, by means of the model checker PRISM, to compute their exact values. We present a simplified example of a distributed stochastic system where we determine a reachability property and the value of associated rewards in states of interest for a real-world example from a case company in the Danish baked goods industry. the developments are presented in a generalised fashion to make them relevant to the general problem of implementing quantitative probabilistic model checking of graph-based process modelling languages. this paper contains three key elements: 1. SBAT description. 2. Case company description. 3. Using SBAT on the case company. the paper concludes by indicating SBAT's practical applicability and suggests further research directions. Copyright © 2014 by asme.

关键词： Stochastic systems

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Fast kinematic model of a seven-bar linkage with a single compliant link 12

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asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Borboni, Alberto Aggogeri, Francesco Faglia, Rodolfo Università Degli Studi di Brescia Mechanical and Industrial Engineering Department Brescia Italy

ISBN: (纸本)9780791845851

this work deals on a kinematical model of a parallel mechanism for biomedical applications. the mechanism is a linkage composed by three closed loops. It is composed by seven bars (one of them is the frame) constrained each other by ideal constraints (prismatic, rotary or lock joints). the ideal joints introduce 21 degrees of constraint, while the bars produce eighteen degrees of freedom when considered rigid. Six bars are really rigid, while one of them is compliant with respect to the others and allows the mobility of the mechanism. the kinematic of this seven-bar linkage is analyzed with the aim of Hermite's polynomials. the proposed approach is based on the knowledge of kinematical constraints at the ends of the compliant beam, in terms of position and curvature. this knowledge is based on the fact that the rest of the structure is composed by rigid bodies and ideal concentrated constraints. the compliance affects the beam only with bending effects, furthermore, in this work, we consider only a planar linkage, thus the torsion effect is not considered, and the beam is constrained in ways that compression instability is negligible. Although the beam is subjected to important deformations, it is divided in parts, such that each part is subjected to a small deformation. In this way, we propose the Hermite's polynomials to describe the shape of the beam. We tested this fast method to describe the kinematical behavior of the system with a kinetostatic model of a mechanical device, finding that it is reliable for the proposed application. Copyright © 2014 by asme.

关键词： Mechanisms

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Numerical simulations of filling flows in die-casting molding of the thin-walled led heat sink 12

Numerical simulations of filling flows in die-casting moldin...

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Jou, Rong-Yuan National Formosa University Department of Mechanical Design Engineering No.64 Wunhua Rd. Huwei Township Yunlin County632 Taiwan

ISBN: (纸本)9780791845837

In this study, the mold filling analyses of a thin-walled LED heat sink combined with the vacuum valve runner are simulated by FLOW-3D software. Two topics are analyzed and discussed. First, numerical simulations for variety of molding conditions, including effects of thermal conductivity, vacuum pumping pressure, mold temperature, filling velocity, respectively, are conducted for the computational model of the thin-walled LED heat sink connected with the vacuum shut-off valve. Second, effects of several geometrical parameters, including fin thicknesses of the LED heat sink and dimensions of the vacuum shut-off valve are explored. In these two topics, melts are set to liquid metal of Al 384.0 materials. the first topic of analysis mainly to investigate the effects of molding parameters based upon the same computational model of the thin-walled LED heat sink connected with a vacuum valve runner. the simulated results show if molding conditions are changed, different sizes of defects are appeared in castings;if vacuum pumping pressure is higher, the casting is also firmness, density prone to increase;if vacuum pumping pressure is too low, then pumping efficiency of mold cavity is low and it will be easy to form the casting porosity defects. For the second topic of analysis, molding conditions are hold constantly, and effects of different geometrical dimensions to castings qualifications are simulated. Characteristic dimension of trigger mechanism can effectively operate the vacuum shut-off function;but too thin or too thick of channel, it will affect the pumping time if different degrees of vacuum is imposed. Decreasing of gas residuals in castings for the vacuum pumping pressures of 760Torr, 200Torr, 100Torr compared with 10Torr, were 0.311%, 0.174%, 0.008%, respectively. It shows the appropriate and effective vacuum level for vacuum die-casting of the thin-walled LED heat sink is in the range of 100Torr. Copyright © 2014 by asme.

关键词： Light emitting diodes

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New Schoenflies-motion manipulator implementing isosceles triangle and delassus parallelogram 12

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asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Lee, Chung-Ching Hervé, Jacques M. Dept. Mold and Die Engineering National Kaohsiung University of Applied Sciences 415 Chien Kung Road Kaohsiung80782 Taiwan Ecole Centrale des Arts et Manufactures Grande Voie des Vignes Chatenay-MalabryF-92295 France

ISBN: (纸本)9780791845851

Schoenflies (X) motion is a 4D displacement Lie group including a spatial translation and any rotation whose axis is parallel to a given direction. Delassus parallelogram has four parallel screw (H) pairs with related pitches and the isosceles triangle is a special HHHP. After merging these two chains, an HHH-//-HHH generator of 2-DoF translation along a right helicoid is derived. It produces a 2-DoF motion mathematically modeled by a 2D submanifold of a 4D group of X-motion. Because of the product closure in an X-group, the 4-DoF generator with HHH-//-HHH loop serving as a subchain is revealed by adding two H pairs with axes parallel to fixed H axes. Parallel arrangement of two generators of the same X motion results in a new Schoenflies-motion manipulator with hybrid topology for 4-DoF pick-and-place operations. Four fixed H pairs (two double Hs) can actuate this manipulator and the two coaxial Hs must have distinct pitches. In addition, the possible design choices of special architectures are introduced for practical applications. Computer simulations of the new parallel manipulator with Schoenflies motion verify the effectiveness. Copyright © 2014 by asme.

关键词： Manipulators

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Finite-element simulation of temperature fields and residual stresses in butt welded joints and comparison with experimental measurements 12

引用

asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Armentani, Enrico Pozzi, Angela Sepe, Raffaele Dept. of Chemical Materials and Production Engineering University of Naples Federico II Piazzale V. Tecchio 80 Naples80125 Italy Advanced Transports S.r.l. Zona Ind Ex Indesit Gricignano di Aversa81130 Italy

ISBN: (纸本)9780791845837

Welding is used in fabrication of structures ranging from small components to large and important structures. One of the important problems associated with welded structures is development of residual stresses and deformations due to welding temperature. In fact when structures are manufactured by welding, a non-uniform temperature distribution is produced. this distribution initially causes a rapid thermal expansion followed by a thermal contraction in the weld and surrounding areas, thus generating inhomogeneous plastic deformation and residual stresses in the weldment when it is cooled. High residual stresses in regions close to the weld may promote brittle fracture, fatigue, or stress corrosion cracking. Meanwhile, distortion in base plate may reduce the buckling strength of structural members. therefore estimating the magnitude and distribution of welding residual stresses and distortion are necessary for achieving the safest design. In the present work an elastic-plastic finite element model considering temperature dependent mechanical properties is used to evaluate residual stresses. In this study a parametric model is adopted and the elements birth and death are used in single-pass butt welded joint to simulate the weld filler variation with time. then numerical results are compared with experimental data. Copyright © 2014 by asme.

关键词： Residual stresses

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Cracks susceptibility elimination in fiber laser cladding of Ni-based alloy with addition of tungsten carbides 12

Cracks susceptibility elimination in fiber laser cladding of...

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asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Zarini, Stefano Previtali, Barbara Vedani, Maurizio Rovatti, Ludovica Department of Mechanical Engineering Politecnico di Milano Milano Italy

ISBN: (纸本)9780791845851

In plastic injection molding the most critical component in terms of wear and corrosion problem is represented bythe barrel-screw system. this is due to the friction of plastic on the inner part of the barrel and to contact between the screw and the inner walls of the barrel. Fiber laser cladding is a promising technique that, through deposition of powder onto a substrate increases wearproprieties and consequently lifetime of the component. In particular, cladding Ni-Cr alloy with WC is an extremely promising combination of elements for this purpose. Specifically, WC is able to increase the hardness of the deposit so that it becomes more suitable for severe wear application. On the other hand, high Cr amount contained in the Ni-based alloy, guaranties high corrosion resistance for harsh environments. Nevertheless, this combination of materials is highly susceptible to cracks. through the optimization of process parameters and preheating temperature (250-350-450-550°C) defect free coatingsare obtained. this work presentsan investigation on fiber laser cladding of Ni based alloy (Ni40, Ni60) with addition of spherical tungsten carbides (-53+20 μm) on C60 steel substrate. Optimal conditions are evaluated through macro and a micro analysis. In the first case penetrantliquids are used to evaluate crack *** the second field, micro hardness was measured and microstructure if crosssectioned sampleswere investigated by optical microscopy. Copyright © 2014 by asme.

关键词： Laser cladding

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Vibro-acoustic analysis of a heavy duty truck cabin 12

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asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Yenerer, Hakan Stan, Andrei Cristian Sendur, Polat Basdogan, Ipek Department of Mechanical Engineering Koc University Istanbul34450 Turkey Vehicle Engineering Ford Otosan Izmit41650 Turkey

ISBN: (纸本)9780791845844

Automotive manufacturers invest a lot of effort and money to enhance the vibro-acoustic performance of their products. In a complex dynamic system such as a truck cabin, the enhancement effort may be very difficult and time-consuming if only the 'trial and error' method is used without prior knowledge about the noise contributors. the purpose of this paper is to identify the most influential noise radiating panel in a passenger cabin compartment of a heavy duty truck. the noise inside the vehicle cabin originates from various sources and travels through many pathways. the first step of sound quality refinement is to find the pathways and corresponding operational internal forces. Operational acceleration responses and frequency response functions (FRFs) are measured on a prototype truck to determine the excitation forces while engine is running in operational conditions. Once these internal forces are identified using the experimental force identification (FI) technique, they are utilized to predict the total sound pressure level inside the cabin and also perform the panel acoustic contribution analysis (PACA) to determine the most problematic panel of the cabin. A coupled vibro-acoustic finite element model (FEM) is used to predict the sound pressure level inside the cabin. Sound pressure levels at the driver's and passenger's right and left ears are determined numerically for excitation coming from the cabin mounts ranging between 20-200 Hz. When the most noise radiating panel is identified, it can be redesigned to improve the sound pressure level inside the cabin. Copyright © 2014 by asme.

关键词： Trucks

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Development of a water brake dynamometer with regard to the modular product design methodology 12

Development of a water brake dynamometer with regard to the ...

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asme 2014 12th biennial conference on engineering systems design and analysis, ESDA 2014

作者： Torabnia, Shams Banazadeh, Afshin Department of Aerospace Engineering Sharif University of Technology Tehran Iran

ISBN: (纸本)9780791845837

this paper summarizes a research project in the field of design and manufacturing of a water brake dynamometer for power testing facilities. In the current study, the design process of a water brake with drilled rotor disks is presented. this process is examined against the development of a water brake for a 4MW gas turbine power measurement at 15,000 RPM speed. the proposed algorithm is based on vital assumptions such as;applying product designing issues and limited modular analysis that urges the disciplinary attitude and leads to the possibility of rapid development, easy maintenance and ease of access. the final scheme is divided into six disciplines with functional classification. these disciplines are rotor, housing, cabs, pedestals, skid and accessories. Accessories, itself, consist of cooling system, lubricating system and control unit. Every discipline has its special function and could be optimized separately. It is possible to change any discipline specification without affecting other disciplines modularity. Using FEM software makes it easy to analyze the mechanical component for static and dynamic load condition regarding complex initial and boundary condition. But it is not wise to analyze whole system for designing a product due to numerical calculation errors. Besides, it is not necessary to use calculation to select machine elements. Rotor dynamics is investigated with modal analysis and related Campbell diagram. Also, transient analysis on housing, rotor and load cell arm is presented. the modal analysis on pedestals and skid is performed to predict the structural behavior under periodic loads caused by rotating unbalance. the process presented in this paper is a method for design of water brake dynamometer. Modularity presented by a product tree and a trend for design cycles associated with computer simulation are the basis of this method. the final product that is designed with this algorithm is successfully manufactured and tested. Copyright © 2

关键词： Transient analysis

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