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thE ROLE OF PLACENTAL LOCATIONS ON FETUS MORTALITY IN ROAD TRAFFIC ACCIDENTS

THE ROLE OF PLACENTAL LOCATIONS ON FETUS MORTALITY IN ROAD T...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Moustafa, Moustafa Acar, B. Serpil Acar, Memis Univ Loughborough Design Sch Loughborough LE11 3TU Leics England

ISBN: (纸本)9780791844847

the aim of this study is to investigate the possible role of placental location on the risk of placental abruption in road traffic accidents involving a pregnant driver. Placental abruption accounts for around 50-70% of fetal deaths in motor vehicle accidents. the computational pregnant occupant model, 'Expecting', which has a multi-body fetus and a finite element uterus model was developed at Loughborough University and is used in this investigation. the placenta is located in the upper region of the uterus near the fundus in 'Expecting'. Four locations for the placenta;anterior, posterior, lateral left, lateral right cases are modelled and used in simulations in this study. these models are used to simulate a range of frontal impacts of severity 15 kph and 30 kph. three cases of occupant restraint: three-point seatbelt with an airbag, three-point seatbelt only and airbag only conditions are investigated. the maximum strains developed in the uterus and utero-placental interface (UPI) have been estimated and compared for these scenarios in order to investigate placental abruption that leads to fetal loss. Placenta located at anterior position is found to be at higher risk than other positions considered.

关键词： Location

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OPTIMAL design AND EXPERIMENTAL VALIDATION OF A TURGO MODEL HYDRO TURBINE

OPTIMAL DESIGN AND EXPERIMENTAL VALIDATION OF A TURGO MODEL ...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Anagnostopoulos, John S. Koukouvinis, Phoevos K. Stamatelos, Fotis G. Papantonis, Dimitris E. Natl Tech Univ Athens Sch Mech Engn GR-10682 Athens Greece

ISBN: (纸本)9780791844854

this work presents the development and application of a new optimal design methodology for Turgo impulse hydro turbines. the numerical modelling of the complex, unsteady, free surface flow evolved during the jet-runner interaction is carried out by a new Lagrangian particle method, which tracks a number of representative flow elements and accounts for the various hydraulic losses and pressure effects through special adjustable terms introduced in the particle motion equations. In this way, the simulation of a full periodic interval of the flow field in the runner is completed in negligible computer time compared to the corresponding needs of modern CFD software. Consequently, the numerical design optimization of runner geometry becomes feasible even in a personal computer and affordable by small and local manufacturers. the bucket shape of a 70 kW Turgo model is properly parameterized and numerically optimized using a stochastic optimization software to maximize the hydraulic efficiency of the runner. the optimal runner and the rest turbine parts are then manufactured and installed in the Lab for testing. Detailed performance measurements are conducted and the results show satisfactory agreement with the numerical predictions, thus validating the reliability and effectiveness of the new methodology.

关键词： Turgo impulse turbine Particle simulation method Bucket parameterization design optimization Performance measurements

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ANISOthERMAL FLOW CONTROL BY USING REDUCED-ORDER MODELS

ANISOTHERMAL FLOW CONTROL BY USING REDUCED-ORDER MODELS

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Tallet, Alexandra Leblond, Cedric Allery, Cyrille Univ La Rochelle LaSIE F-17042 La Rochelle France

ISBN: (纸本)9780791844854

Despite constantly improving computer capabilities, classical numerical methods (DNS, LES,...) are still out of reach in fluid flow control strategies. To make this problem tractable almost in real-time, reduced-order models are used here. the spatial basis is obtained by POD (Proper Orthogonal Decomposition), which is the most commonly used technique in fluid mechanics. the advantage of the POD basis is its energetic optimality : few modes contain almost the totality of energy. the ROM is achieved with the recent developed optimal projection [1], unlike classical methods which use Galerkin projection. this projection method is based on the minimization of the residual equations in order to have a stabilizing effect. It enables moreover to access pressure field. Here, the projection method is slightly different from [1] : a formulation without the Poisson equation is proposed and developed. then, the ROM obtained by optimal projection is introduced within an optimal control loop. the flow control strategy is illustrated on an isothermal square lid-driven cavity and an anisothermal square ventilated cavity. the aim is to reach a target temperature (or target pollutant concentration) in the cavity, with an interior initial temperature (or initial pollutant concentration), by adjusting the inlet fluid flow rate.

关键词： Principal component analysis

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BEHAVIOR IDENTIFICATION FOR WHEELCHAIR DRIVER USING thE FUZZY C-MEANS CLASSIFICATION MEthOD

BEHAVIOR IDENTIFICATION FOR WHEELCHAIR DRIVER USING THE FUZZ...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Gacem, A. Nadjar-Gauthier, N. Monacelli, E. Al-ani, T. Oussar, Y. LISV UVSQ F-78140 Velizy Villacoublay France

ISBN: (纸本)9780791844854

this study deals with behavior identification of Electric-Powered Wheelchair (EPW) drivers. User's actions on the joystick determine this behavior We assume that a driver evaluation can be performed using reference behaviors which are determined a priori. this study was carried out with two valid. populations. the first one includes eight experimented subjects. the second includes six novice subjects. We propose to implement the Fuzzy C-Means (FCM) classification to separate different behaviors. the FCM was applied on the experimented population in order to determine reference's behaviors. this shows that there were basically two different behaviors. An evaluation is performed on novice users by comparing their behaviors with respect to the reference ones. the results show that this population has an erratic behavior during the learning phase. Subsequently, users converge to one of the identified reference behaviors. We also evaluated a subject who suffers from muscular dystrophy and uses an EPW in everyday life. the results show a steady driving behavior.

关键词： wheelchair driving assessment behavior evaluation Fuzzy C-means clustering non-parametric analysis

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BEST PRACTICES ASSESSMENT IN REQUIREMENTS engineering TOOLS INTEGRATION

BEST PRACTICES ASSESSMENT IN REQUIREMENTS ENGINEERING TOOLS ...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Mahut, Stephanie Glatard Eynard, Benoit Merlo, Christophe Minel, Stephanie Beaujon, thierry Univ Technol Compiegne Dept Mech Syst Engn CNRS UMR 7337 Compiegne France

ISBN: (纸本)9780791844861

Companies can use methodological software tools to perform requirement engineering. those methodological tools are increasingly developped by external software editors and integrators. the performance of the tools is not enough to ensure efficiency of methodology application. this paper is part of a PhD research programm. this research program focuses on the way of integrating requirement engineering tools into product design department with a provider perspective. To be more precise, this research project emphasizes on modifications occuring during integration phases. In order to evaluate and to improve integration process, key indicators can be proposed. From the first stage of integration to the moment the user is autonomous, key integration factors often change. For example, requirements of the user,. user environment, product life cycle, delay for integration, actors, ... this paper aims at proposing surveys to identify those changing key factors. then, first best practices elements are given to counteract the possible negative impact on efficiency of requirement engineering tools integration and thus, on product development. In fact, this paper goes further into the way to analyze the existing system. It notably deals with first elements from industrial survey on IT vendor and their customer perspectives on tools integration. In addition, preliminary survey results on customer dissatisfaction are proposed and analyzed. It also proposes a short case study and further research work in order to assume those first results and to bring to the definition of integration approach for methodological tools in engineering domain.

关键词： Integrated design Value engineering Requirement engineering design Support System Efficiency Indicators

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STATE OF thE ART IN thE ECO-design FIELD: TOWARD SPECIFICATIONS FOR thE INTEGRATION OF ECO-design IN thE AUTOMOTIVE SECTOR

STATE OF THE ART IN THE ECO-DESIGN FIELD: TOWARD SPECIFICATI...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Garcia, Julien Millet, Dominique Tonnelier, Pierre PSA Peugeot Citroen F-78140 Velizy Villacoublay France

ISBN: (纸本)9780791844861

this paper lies within the integration of an eco-design method adapted to the Innovation structure at a car manufacturer. the environmental constraints in the automotive industry are more and more important (European emission standards for exhaust emissions, European directive on end-of life vehicles ...). Eco-design is a new manner to design products related to the concept of sustainable development, which combines economy and ecology and put the environmental criterion alongside the classical criterions of design. the goal of this study is to identify the specifications of a strategy for integrating the dimension "Environment". this strategy is applied in the innovation process thanks to eco-design tools which are the learning vectors for an organization, and therefore support a learning process. this process is structured with the interactions between the management of firm, the environment department, and the design team. therefore we first make a synthesis of the different classifications of eco-design tools and use two categories: diagnosis and improvement. Second, as our goal is the integration in the Innovation structure and within a design process, we analyze some design process models and highlight the RID (Research, Innovation structure, Development) concept. third, the main practices of several car makers are synthetized and a focus on three of them (Volvo, Ford, and Volkswagen) is made;we link their strategies with the concept of RID. Finally in the fourth part, we propose a model of a strategy for integrating eco-design practices based on the three examples and supported by a learning process.

关键词： Automotive industry

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MEthODOLOGY FOR thE design OF COOLING CHANNELS IN thERMOPLASTIC INJECTION MOULDING PROCESS

METHODOLOGY FOR THE DESIGN OF COOLING CHANNELS IN THERMOPLAS...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Agazzi, Alban Sobotka, Vincent Le Goff, Ronan Jarny, Yvon Pole Europeeen Plasturgie F-01100 Bellignat France

ISBN: (纸本)9780791844854

Injection is one of the most used processes to manufacture thermoplastic parts. the design of the cooling channels in this process is of great importance during the mould design. Indeed, an inappropriate cooling will lead to defects in the part and a low production rate. In this paper, a new approach for the design of the cooling channels is assessed. Based on morphological concepts, the idea of regulation by cooling surface is introduced. the thermal behaviour of the mould can be restricted on the spatial domain delimited by the cooling surface on which a spatial temperature distribution is imposed. the first step of the methodology leads to the optimal determination of the fluid temperature distribution along the cooling surface in order to minimize a cost function composed of two terms linked to the quality of the part and the productivity of the process. the conjugate gradient algorithm coupled with a Lagrangian technique is implemented for the determination of fluid temperature parameters. However, the obtained solution is not workable in practice. the second step consists then in building real channels from this optimal distribution. the shape, location and fluid temperature level of these channels are determined a posteriori from the thermal analysis of the temperature field in the mould domain located between the plastic part and the cooling surface. Channels are builded by using the contours of isotherms in the thermal steady-state area of the mould. It becomes then possible to design the cooling channels with no a priori on the numbers, the location of these channels and on the temperature of the coolant fluid. the methodology is first illustrated with a 2D part. Results are compared with literature.

关键词： Temperature distribution

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design OF A HAND EXOSKELETON FOR SPACE EXTRAVEHICULAR ACTIVITIES

DESIGN OF A HAND EXOSKELETON FOR SPACE EXTRAVEHICULAR ACTIVI...

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Mousavi, Mohamad Mehdi Appendino, Silvia Pescarmona, Francesco Battezzato, Alessandro Chen, Fai Chen Favetto, Alain Soma, Aurelio Italian Inst Technol Ctr Space Human Robot I-10129 Turin Italy

ISBN: (纸本)9780791844861

Due to the bulk and stiffness of the astronauts' glove, so called Extravehicular Activity (EVA) glove, many problems occur during their missions outside the spacecraft i.e. fatigue, dexterity reduction, decrease of possible EVA hours, etd. [1, 2]. To solve these problems a hand exoskeleton which can be embedded inside the astronauts' glove has been proposed as a solution to help them to move their fingers more easily. In this work all the steps that were taken towards the design of a preliminary version of the hand exoskeleton are explained in detail. the paper starts with a brief survey on related literature, followed by an analysis of three main research subjects for the design and realization of the hand exoskeleton: sensors, actuators and structure. In particular, different kinds of sensors and actuators are evaluated and advantages and disadvantages of each one are investigated. then the main reasons to choose a specific type of sensor or actuator are described in detail. Regarding the structure, different possible solutions converging towards an optimal design for this application have been evaluated. Moreover, the use of some springs in the structure to simulate the stiffness of the EVA glove is proposed in order to be able to test the device in a condition similar to its final application. A brief description about the kinematic modeling and simulation of the structure in order to find the optimum location of the transmission cables and their tension forces is explained.

关键词： EVA (Extravehicular Activity) Glove Hand Exoskeleton Robotic Hand

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KNOWLEDGE BASED REVERSE engineering MEthODOLOGY

KNOWLEDGE BASED REVERSE ENGINEERING METHODOLOGY

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Remy, Sebastien Laroche, Florent Durupt, Alexandre Bernard, Alain Univ Technol Troyes Inst Charles Delaunay Lab Syst Mecan & Ingn Simultanee F-10010 Troyes France

ISBN: (纸本)9780791844878

In Reverse engineering, commercial solutions such as Geomagic (TM) or RapidForm (TM) or CAD software such as CATIA (TM) provide very efficient toolboxes that enable to rebuild geometry. Moreover, some of them provide segmentation algorithms, sketchers and/or many other facilities rebuilding tools in order to help to recover the original surface. those software's enable to rebuild the geometry of a technical object as a set of functions (protrusion, revolution, sweep...), they enable to add colours and textures, and they enable realistic kinematical animation and many other things. Unfortunately, all those toolboxes present a lack of geometry analysis tools. the geometry of a given product is the consequence of a complete process, it is important, considering Reverse engineering activities, to try to recover any evidence of its past life (including socio-economical aspects, the design intents of the former designer, its different uses...) from its geometry in order to produce a good quality 3D model. Such models can provide important possibilities for Reverse engineering. It enables to study the product more efficiently than a geometrical model based on a mesh or on free form surfaces. this paper proposes approaches and methodologies for using knowledge to rebuild CAD model to the best closer to the original CAD model that could have been obtained by the original designer. Such a model is feature based. they can be functional features or manufacturing features. For a good rebuilt of 3D model, the geometry of these features is driven by parameters, rules and relationships that are provided by the former designer.

关键词： 3D digitalization Reverse-engineering Knowledge Based System CAD STEP

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ROBUST analysis OF A WIRELESS BISTABLE MICRO-ACTUATOR

ROBUST ANALYSIS OF A WIRELESS BISTABLE MICRO-ACTUATOR

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11th asme biennial conference on engineering systems design and analysis, (ESDA 2012)

作者： Zaidi, Syed Sajid Hussain Cherfi-Boulanger, Zohra Boudaoud, Nassim Pouille, Philippe Lamarque, Frederic Tech Univ Compiegne Roberval Lab UMR 6253 Compiegne France

ISBN: (纸本)9780791844854

Nowadays, the integration of micro-actuators in the micro-systems poses a significant problem due to the complex designs as well as due to the contact power supply systems (e.g., via micro-batteries or via wires). A way to overcome this problem is to provide remote power supply and control to the bistable micro-actuators. It is mainly done by RF (radio-frequency) or optical means. As a consequence, the stability of the two positions of this kind of micro-actuators and the switching time evolution between them have to be studied to determine the robustness of the contactless bistable micro-actuators. In this work, these system parameters were analysed by the ANOVA (analysis Of Variance) method during a long-life test for 8 different configurations (design of Experiments) of bistable micro-actuators controlled by laser. Transient and permanent regimes were observed for the stability of the positions, for the standard deviation around the positions and for the switching time as well. In each case, the transient regime represented only 3% of the total duration of the long-life test. A very good stabilisation was observed in the permanent regime whereas a decrease of the stroke was observed in the transient regime. As a consequence, during this regime, the switching time was reduced compared with the regular values (few seconds, optical power dependent). In the permanent regime, a progressive increase of this factor was noted that indicated the progressive fatigue of the bistable micro-actuator. A second indicator of the micro-actuator fatigue was given by the increase of the standard deviation of the stable position after cycle number 9000. Above this point, the micro-actuator was vibrating during the functioning even if the stability remained acceptable.

关键词： design of experiments

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