Reconfigurable computing systems require supports from powerful computer aided design tools to help users developing the interactions between software programs and hardware circuits. The placement and routing support for reconfigurable processing units is also the key to the efficiency of the computing system. In this thesis, we implemented the placement and routing tool for the FMRPU (Fine-grain Multi-context Reconfigurable Processing Unit). The routing resource among the Logic Arrays supports only 8-bit aligned data width, so the routing of the FMRPU can¡¦t completely imitate from the pattern used by LUT-based routing. Thus we proposed an operation-based design model which accepts a data flow graph that describes the operations of the circuit. After compressing the graph, the tool uses Simulated Annealing algorithm with either Maze Route or Center-of-Gravity Route to map the compressed graph into FMRPU. Through the placement and routing tool we implemented, we have successfully mapped several algorithms used in multi-media applications, such as FFT and DCT, into FMRPU.

ABSTRACT DESIGN AND CONSTRUCTION OF A SIX DEGREE OF PLATFORM G&uuml / rb&uuml / z, Sarper M.S., Department of Mechanical Engineering Supervisor: Prof. Dr. Tuna BALKAN Co-Supervisor: Prof. Dr. M. A. Sahir ARIKAN November 2006, 83 pages In this thesis a six degree of freedom (DOF) parallel manipulator is designed, developed and simulated virtually. The platform, which is specified and focused on in this thesis, is the specific solution for the generating the required data to simulate a land, airborne or sea vehicle&amp / #8217 / s motion trajectory in the laboratory environment. After explaining the need for such platforms for the military industry, the existing devices will be presented and discussed. Then the design period will be explained while pointing out the key performance criteria. The gathered performance values of the first design iteration will be presented and the modifications done in order to get to the expected performance will be given. Finally an investigation, in order to find the maximum payload that the platform can handle, is performed and presented. It is too hard to get to the desired performance values in mechanical design and manufacturing without using the CAD (Computer Aided Design) and CAM (Computer Aided Manufacturing) programs. In this thesis ProEngineer Wildfire&reg / is used for solid modeling the components, the sub-assemblies and the final assembly, ANSYS Workbench&reg / is used for investigating the modal behavior of the components, ADAMS&reg / 2003 is used for the dynamic simulation of the mechanism, ADAMS/Flex&reg / , ADAMS/AutoFlex&reg / and ADAMS/Durability&reg / are used to analyze the results when flexibility is embedded into the system. At the end of the thesis in Appendix section five technical drawings with the nominal dimensions are given in order to clarify the construction period. By the regulations that must be obeyed in ASELSAN only the nominal dimensions are given in the technical drawings. All the dimensional and geometrical tolerances are given in the approved technical drawings that are proprietary of ASELSAN. Keywords: 6-Axis Motion Platform, Application of CAD and analysis programs, Electromechanical Design, Stewart Platform

Flap, aileron, rudder, elevator, speed brake, stick, landing gear and similar movable systems used in aerospace industry have to operate according to the defined requirements and mechanisms used in those systems have to be synthesized in order to fulfill those requirements. Generally, without the use of synthesis tools, synthesis of mechanisms are done in CAD environment by trial-error and geometrical methods due to the complexity of analytical procedures. However, this approach is time consuming since it has to be repeated until the synthesized mechanism has suitable mechanism properties like transmission angle and connection points. Due to above reasons, a software developed for synthesis of mechanisms within the CAD environment can utilize all the graphical interfaces and provides convenience in mechanism design. In this work, it is aimed to develop a four-bar mechanism synthesis tool which is compatible with CATIA V5 by considering the requirements of aerospace industry. This tool performs function, path and motion synthesis and shows suitable mechanisms in CATIA according to input obtained from CATIA and mechanism properties.

No description available.

The concept of applying several disciplines to the design and optimization processes may not be new, but it does not currently seem to be widely accepted in industry. The reason for this might be the lack of well-known tools for realizing a complete multidisciplinary design and analysis of a product. This study aims to propose a method that enables engineers in some design disciplines to perform a fairly detailed analysis and optimization of a design using commercially available software as well as codes developed at Georgia Tech. The ultimate goal is when the system is set up properly, the CAD model of the design, including all subsystems, will be automatically updated as soon as a new part or assembly is added to the design; or it will be updated when an analysis and/or an optimization is performed and the geometry needs to be modified. Such a design process takes dramatically less time to complete; therefore, it should reduce development time and costs. The optimization method is demonstrated on an existing helicopter rotor originally designed in the 1960's. The rotor is already an effective design with novel features. However, application of the optimization principles together with high-speed computing resulted in an even better design. The objective function to be minimized is related to the vibrations of the rotor system under gusty wind conditions. The design parameters are all continuous variables. Optimization is performed in a number of steps. First, the most crucial design variables of the objective function are identified. With these variables, Latin Hypercube Sampling method is used to probe the design space of several local minima and maxima. After analysis of numerous samples, an optimum configuration of the design that is more stable than that of the initial design is reached. The process requires several software tools: CATIA as the CAD tool, ANSYS as the FEA tool, VABS for obtaining the cross-sectional structural properties, and DYMORE for the frequency and dynamic analysis of the rotor. MATLAB codes are also employed to generate input files and read output files of DYMORE. All these tools are connected using ModelCenter.

Im Rahmen der Arbeit wurden die Zusammenhänge zwischen den Materialeigenschaften und der Schnittkonstruktion für körpernahe Bekleidung untersucht, um eine konstante und reproduzierbare Passform zu sichern. Es wurden Materialkenngrößen ermittelt, die einen entscheidenden Einfluss auf die Passform haben, und geeignete Prüfverfahren zur Bestimmung dieser Materialparameter analysiert. Dazu zählen bei Maschenwaren, die für diese Produktgruppe hauptsächlich eingesetzt werden, vor allem die Zugelastizität und das Dimensionsverhalten. Es wurden Konstruktionsprinzipien entwickelt, mit denen die Materialparameter systematisch in der Schnittgestaltung berücksichtigt werden können. Die Konstruktionsmethoden wurden auf CAD-Systeme umgesetzt. Die erarbeiteten Konstruktionsgrundlagen geben den Bekleidungsherstellern die Möglichkeit, die Produktionsentwicklungszeiten zu reduzieren und so die Flexibilität zu steigern.

<p>This thesis presents the work done to implement new computational tools and methods dedicated to aircraft conceptual design sizing and optimization. These tools have been exercised on different aircraft concepts in order to validate them and assess their relevance and applicability to practical cases.First, a geometry construction protocol has been developed. It is indeed essential to have a geometry description that supports the derivation of all discretizations and idealizations used by the different analysis modules (aerodynamics, weights and balance, stability and control, etc.) for which an aircraft concept is evaluated. The geometry should also be intuitive to the user, general enough to describe a wide array of morphologies and suitable for optimization. All these conditions are fulfilled by an appropriate parameterization of the geometry. In addition, a tool named CADac (Computer Aided Design aircraft) has been created in order to produce automatically a closed and consistent CAD solid model of the designs under study. The produced CAD model is easily meshable and therefore high-fidelity Computational Fluid Dynamics (CFD) computations can be performed effortlessly without need for tedious and time-consuming post-CAD geometry repair.Second, an unsteady vortex-lattice method based on TORNADO has been implemented in order to enlarge to scope of flight conditions that can be analyzed. It has been validated satisfactorily for the sudden acceleration of a flat plate as well as for the static and dynamic derivatives of the Saab 105/SK 60.Finally, a methodology has been developed to compute quickly in a semi-empirical way the buffet envelope of new aircraft geometries at the conceptual stage. The parameters that demonstrate functional sensitivity to buffet onset have been identified and their relative effect quantified. The method uses a combination of simple sweep theory and fractional change theory as well as the buffet onset of a seed aircraft or a provided generic buffet onset to estimate the buffet envelope of any target geometry. The method proves to be flexible and robust enough to predict within mainly 5% (and in any case 9%) the buffet onset for a wide variety of aircrafts, from regional turboprop to long-haul wide body or high-speed business jets.This work was done within the 6^th European framework project SimSAC (Simulating Stability And Control) whose task is to create a multidisciplinary simulation environment named CEASIOM (Computerized Environment for Aircraft Synthesis and Integrated Optimization Methods), oriented toward stability and control and specially suited for aircraft conceptual design sizing and optimization.</p> / SimSAC

La réalisation des circuits analogiques à hautes performances souffre de difficultés principalement dues à la réduction de la tension d'alimentation et à la réduction de la consommation, qui sont conduites par la prolifération des systèmes portables aliméntés par des batteries, mais pâtit aussi du manque d'outils de CAO permettant d'automatiser la phase de layout qui est assez laborieuse et prend beaucoup de temps. Cette thèse se situe dans ce contexte. Elle traite de deux domaines assez distincts mais complémentaires, à savoir la conception de circuits intégrés analogiques à faible tension d'alimentation, et la génération automatique (ou assistée) du layout de ces circuits à l'aide d'algorithmes et de logiciels appropriés. L'aboutissement de cette thèse est, premièrement, la création d'une nouvelle méthode de conception de circuits intégré analogiques, plus précisement la génération d'une technique de conception de nouvelle structure, plus adaptée aux basses tensions d'alimentation et aux faiblesconsommations, deuxièmement, notre contribution à l'automatisation de la phase du layout des circuits intégrés analogiques, à savoir l'étude détaillée des contraintes analogiques à prendre en compte dans tout outil d'automatisation du layout (Générateur, Placeur, Routeur, Compacteur), ainsi que notre participation au développement de CHIRVAN (outil d'automatisation des masques des circuits intégrés analogiques et mixtes, développés au CNET Grenoble) en aidant à sa mise au point, en l'utilisant, en proposant des améliorations, et surtout en consacrant tous nos efforts à développer un algorithme de placement des cellules analogiques qui prend en compte toutes ces contraintes analogiques

D’ici quelques années, des capteurs de toutes sortes vont envahir notre environnement. Nous en rencontrons déjà beaucoup autour de la voiture, de l’ordinateur ou de la téléphonie. Cette multiplication à grande échelle des capteurs n’est toutefois possible que si, d’une part, ils communiquent sans fil et, d’autre part, ils sont entièrement autonomes du point de vue énergétique. Concernant les systèmes de communication, beaucoup de progrès et de normes sont apparus ces dernières années. La technologie semble être au point, même si des améliorations en terme de consommation sont encore possibles. Quant à l’autonomie énergétique, elle pose actuellement un véritable problème à cause de la durée limitée des piles ou batteries, sans compter leurs problèmes de pollution. L’idée est donc de récupérer l’énergie (mécanique, thermique, chimique ou rayonnante) qui entoure les capteurs pour les alimenter afin de les rendre autonomes durant leurs durées de vie. Suite à une importante étude bibliographique, nous nous sommes orientés vers la récupération de l’énergie de vibrations mécaniques. Une campagne de mesure nous a alors permis d’évaluer l’énergie disponible dans un certain nombre d’environnements et de dimensionner un système qui permette de convertir sur une large bande de fréquences cette énergie mécanique en énergie électrique. Nous avons alors initialisé deux réalisations ; une première macroscopique en tungstène validant le concept et une deuxième en technologie silicium permettant de miniaturiser le récupérateur d’énergie afin de le rendre compatible avec les dimensions des capteurs à alimenter. Les premiers essais avec la structure en tungstène ont montré la possibilité de récupérer environ 480 µW pour une excitation à 50 Hz et d’amplitude 80 µm.

<p>Abstract (in English)</p><p>The work that lead to a CE- marking and the creation of a total drawing foundation on an existing machine carried out on the company Polytec Composites Sweden AB in Ljungby. The company have design an machine that exist in six example that runs in the production. To be able to use the machine the company have to work out a CE-marking. The process that summed up all the document that needs for the machine to make a CE-marking. The documentation includes a total drawing over the machine and a risk analysis performed by a group employers on the company. The computer program that i used to make the drawings is Catia V5. The work that the company and the student performed ended up in a CE-marking of the machine.</p> / <p>Sammanfattning (på svenska)</p><p>Arbetet med att CE-märka och skapa ett ritningsunderlag på en befintlig maskin genomfördes på företaget Polytec Composites Sweden AB i Ljungby. Företaget har konstruerat och tagit fram en maskin som finns i 6st exemplar och som används i produktionen. För att få använda maskinerna så behövdes en CE-märkning så att maskinerna är godkända för att användas.</p><p>Processen där sammanställning av dokumentation på en maskin som ska CE-märkas utfördes. Underlaget innefattar bland annat material så som komplett ritningsunderlag och en riskanalys, utförd av studenten och en grupp personer från företaget. CAD programmet som jag använde mig av för att framställa ritningarna heter Catia V5. Arbetet resulterade i en CE-märkning som företaget utförde tillsammans med mig och mitt examensarbete.</p>