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1
PASSOS, MANUELA COELHO DOS. "OPTIMAL DESIGN OF A HETEROGENEOUS VEHICLE FLEET." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2008. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=16531@1.
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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOEsta dissertação tem como objetivo propor modelos matemáticos e ferramentas computacionais de assessoria na tomada de decisão para o dimensionamento da frota ótima de veículos. O trabalho apresenta modelos que visam reduzir os custos de transporte para uma frota heterogênea de veículos composta por veículos próprios e terceirizados. Os modelos são baseados em problemas de Bin Packing, Roteirização de veículos e dimensionamento de frotas heterogêneas e foram moldados para atender as necessidades da empresa em estudo. Os resultados obtidos na aplicação de cada modelo foram comparados e as ferramentas computacionais utilizadas foram analisadas para identificar os pontos positivos e negativos. Este trabalho também propõe um modelo que compara a compra de novos veículos com a terceirização das entregas quando a frota própria não é suficiente para atender a demanda.
This dissertation aims to propose mathematical models and computational tools to optimize the dimension of a heterogeneous vehicle fleet in his size and composition. This work shows models that intend to reduce transportation cost for a heterogeneous fleet compose by own and third vehicles. The models are based in problems such as BPP- Bin packing problem, VRP – Vehicle routing problem and linear programming. The problems have been molded to attend the necessities of the company in the study of case. The results achieved in the application of each model were compared and the computational tools had been analyzed to identify positive and negative points. This work also proposes a model that compares the purchase of new vehicles with the delivery by third company when the own fleet is not enough to attend the demand.
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Perera, Melanie. "Optimal design of a composite active aeroelastic wing." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/6795.
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The primary aim of this research was to design a Seamless Aeroelastic Wing (SAW) structure applicable to a lightweight Unmanned Aerial Vehicle (UAV). Therefore the study focused on optimal design of a SAW structure by utilising the maximum aeroelastic beneficial effect. Although similar to the Active Aeroelastic Wing (AAW) and relevant to the Flapless Air Vehicle Integrated Industrial Research (FLAVIIR), the major difference from them is that a SAW will function as an integrated one piece lifting and control surface. It is designed to produce a desirable wing camber for control by deflecting a hinge-less flexible trailing edge (TE) part instead of a traditional control surface.
Attention was firstly paid on the design of a hinge-less flexible trailing edge control surface and the actuation mechanism applicable for a light-weight aircraft (UAV). The proposed mechanism in the SAW TE section has two innovative design features: an open sliding TE and a curved beam and disc actuation mechanism. This type of actuated TE section allows for the SAW having a smooth camber change in a desirable shape with minimum control power demand. This design concept has been simulated numerically and its feasibility has been demonstrated by a test model.
The wing structure for a small scale UAV is likely to be over designed in terms of strength, stiffness and weight due to manufacturing constraints. For the optimal wing design, the investigation was conducted in two stages. In the first stage, effort was made to design and model an optimised composite wing box for a minimum weight and maximum flutter speed. Both analytical and numerical methods were used for structural stress, vibration and aeroelastic analyses. In the second stage, the study focused on integrating the TE actuation mechanism with the optimised wing box for detailed understanding of the structure. A finite element analysis was conducted to simulate the SAW TE to ensure that structural strength requirements were satisfied. Furthermore, a study was carried out on the structural dynamic behaviour of the SAW TE section under the aerodynamic pressure to demonstrate its dynamic stability. Hence, the outcome of this research shows that a feasible SAW design for a UAV can be achieved.
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Coultate, John. "Optimal and robust design of a MEMS accelerometer." Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438643.
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Goodwin, James. "Optimal design of a high speed rotary braider." Thesis, Liverpool John Moores University, 1990. http://researchonline.ljmu.ac.uk/4986/.
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Flanagan, Michael Brady. "Optimal shape design for a layered periodic structure." Texas A&M University, 2002. http://hdl.handle.net/1969/382.
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Sivakumar, E. "Optimal machine design with metamodelling in a CAD environment." Thesis, Brunel University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288756.
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Zhai, Ning. "Optimal operating strategy for a storage facility." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45285.
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Thesis (S.M.)--Massachusetts Institute of Technology, Computation for Design and Optimization Program, 2008.Includes bibliographical references (p. 100-101).
In the thesis, I derive the optimal operating strategy to maximize the value of a storage facility by exploiting the properties in the underlying natural gas spot price. To achieve the objective, I investigate the optimal operating strategy under three different spot price processes: the one-factor mean reversion price process with and without seasonal factors, the one-factor geometric Brownian motion price process with and without seasonal factors, and the two-factor short-term/long-term price process with and without seasonal factors. I prove the existence of the unique optimal trigger prices, and calculate the trigger prices under certain conditions. I also show the optimal trigger prices are the prices where the marginal revenue is equal to the marginal cost. Thus, the marginal analysis argument can be used to determine the optimal operating strategy. Once the optimal operating strategy is determined, I use it to obtain the optimal value of the storage facility in three ways: 1, using directly the net present value method; 2, solving the partial differential equations governing the value of the storage facility; 3, using the Monte Carlo method to simulate the decision making process. Issues about parameter estimations are also considered in the thesis.
by Ning Zhai.
S.M.
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Wang, Zhonghe. "A unified approach to communication network optimal design problems." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/14918.
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Haggard, Roger Lynn. "A design methodology for optimal parallel coupled cyclic computing." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/15919.
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Montes, Diez Raquel. "Optimal design of two-stage screens : a Bayesian approach." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342027.
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Blanks, Joseph E. "Optimal Design of an Enclosure for a Portable Generator." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/9585.
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A simple, effective design for enclosing portable generators to reduce the radiated noise is an idea that seems to be desired by the consumers in this market. This investigation is to determine the feasibility of producing such an enclosure for a generator. Several engineering aspects are incorporated in the design of the enclosure. The first, and probably the most paramount, are the acoustical effects of the enclosure itself. The investigation follows the theories for insertion loss of a close fitting enclosure. The thesis examines the system behavior of a close fitting enclosure that most acoustic text books ignore and how the material stiffness, density and source-to-enclosure distance affect the insertion loss and effectiveness of the enclosure. Measured and theoretical sound pressure level around the generator before and after the application of the enclosure are presented using standards described by ISO standard 1344. The second important consideration for the enclosure design involves the heat transfer characteristics. The requirements of cooling air to the generator are discussed. Also presented are some acoustic design considerations to prevent any "direct line of sight" to any of the necessary openings which will help in the overall insertion loss. The use of an optimal engineering design technique is presented, demonstrating its strengths and weakness in this application. The optimization method used for the study is the Hooke and Jeeves, or pattern search method. This method solved for the optimum material properties in approximately 30 iterations depending on the initial starting points and the desired weighting parameters.Master of Science
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SIPES, JUSTIN R. "OPTIMAL DESIGN OF A PNEUMATICALLY ADHERED SENSOR ATTACHMENT DEVICE." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1085609822.
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GU, Hairong. "A Robust Adaptive Autonomous Approach to Optimal Experimental Design." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471590586.
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Lloyd, Jeffrey (Jeffrey M. ). "Error propagation of optimal system design in a hierarchical enterprise." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/43096.
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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 2007.Includes bibliographical references (p. 62-63).
Increased computing power has helped virtual engineering become common practice amongst product development firms. However, while capabilities increase, the desire to simulate even larger systems has increased as well. To deal with the complexity and size of these systems, several techniques have been developed to decompose the system into smaller, more tractable subsystems. The drawback of this approach is a substantial decrease in computational efficiency. Therefore the use of simplified models is encouraged and often required to reach convergence.In this thesis, a test model is introduced where different forms of error can be introduced at each level. Error derived from both measurement inaccuracy and modeling inaccuracy is examined coupled with the effect of system constraints as well. A hierarchical decomposition method is selected for its similarity to a typical enterprise organizational structure. In this manner, the results of the examination should be applicable to both system engineering methods and enterprise level problems. The direction of error propagation within the hierarchical decomposition is determined and the effects of robust design considerations and simple system constraints are revealed.
by Jeffrey Lloyd.
S.M.
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Ben-Asher, Joseph Z. "Optimal evasion against a proportionally guided pursuer." Thesis, Virginia Tech, 1986. http://hdl.handle.net/10919/51126.
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We consider the problem of optimal evasion when the pursuer is known to employ fixed gain proportional navigation . The performance index is a measure of closest approach. The analysis is done for planar motions at constant speed. The kinematics are first linearized around a nominal collision course. The dynamics of the opponents are modeled by first order systems and their accelerations may be bounded.
Three cases are studied: unconstrained optimal evasion (where the evader is not subjected to any path constraint) against a single pursuer, optimal evasion with a terminal path angle constraint for the evader and optimal evasion against more than one pursuer.
The optimal controls are shown to be 'bang - bang' with the number of switches depending on the pursuer’s navigation gain and on the particular constraints of each case.Master of Science
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Di, Matteo Natalia. "Optimal design and numerical analysis of a morphing flap structure." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7934.
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Over the next few years the aviation industry will face the challenge to develop a new
generation of air vehicles characterised by high aerodynamic efficiency and low environmental
impact. The technologies currently available, however, are inadequate to meet
the demanding performance requirements and to comply with the stringent regulations
in terms of polluting emissions.
An innovative and very promising solution is offered by airframe morphing technologies.
Morphing wing structures, internally actuated and able to change their shape smoothly
to adapt to different loading conditions, would be able to achieve near-optimal lift and
drag profiles throughout all the different phases of the flight. This would enhance the
aircraft aerodynamic performance and contribute to a significant reduction of the fuel
consumption, polluting emissions and noise.
The present study has been conducted as part of the European Commission founded
Seventh Framework Program called \Smart High Lift Device for the Next Generation
Wing" (SADE).
The aim of this research is the development of an effective design of a morphing ap
with flexible trailing edge for a commercial aircraft wing. The investigation focused
on morphing concepts which are suitable for large transport aircraft and which can be
effectively developed and become operational within the next 20 years. For these reasons,
the morphing was limited to the high lift devices of the wing, while the conventional wing
box structure was retained. Cont/d.
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Folic, M. "A computer-aided methodology for optimal solvent design for reactions." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508131.
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Shah, Sahil R. "Cost-optimal design of a household batch electrodialysis desalination device." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111935.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 95-100).
This thesis investigates the pareto-optimal design of a household point-of-use batch electrodialysis (ED) system to provide a cost-effective replacement for existing reverse osmosis (RO) devices, for brackish water desalination of Indian groundwater, at lower energy consumption and higher recovery: 80-90% vs 25-40%. Target specifications derived from user-interviews, and RO products, guided the selection of a batch architecture, for which a coupled flow-mass transport model to predict desalination rate was developed, and validated using a lab-scale ED stack. The effects of varying the production rate (9-15 L/hr) and product concentration (100-300 mg/L) requirements on optimal selection of geometry, flow-rates, and applied voltage for total cost minimization were then explored using a multi-objective genetic algorithm. Given the low utilization of the system and the current cost of materials, the energetic cost was dominated by the capital-cost of the system. At a fixed feedwater concentration of 2000 mg/L, which is representative of the upper bound on groundwater salinity underlying much of India, and a recovery ratio of 90%, the capital cost sharply increased for systems targeted at 100 mg/L vs 200 mg/L and 300 mg/L: $141, $93, and $79, respectively averaged for systems that produced between 11.5 and 12.5 L/hr of desalinated water. Promising directions for additional cost reduction include voltage-regulation during the batch process and the development of inexpensive pumps. In addition, a candidate cost-optimal design was prototyped and tested to verify that the measured desalination performance agreed with the modeled expectations.
by Sahil R. Shah.
S.M.
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Meyer, Jan 1977. "A risk-based approach to optimal margins in ship design." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/91373.
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Thesis (S.M. in Ocean Systems Management)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2002.Includes bibliographical references (leaves 135-137).
by Jan Meyer.
S.M.in Ocean Systems Management
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Lochner, Emile Tobias. "Towards a global SQUID network through optimal monitoring station design." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96817.
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Thesis (MEng)--Stellenbosch University, 2015.ENGLISH ABSTRACT: The Superconducting Quantum Interference Device (SQUID) is one of the most sensitive magnetic field sensors in the world. These instruments can only be used optimally for geomagnetic research if placed far from man-made magnetic signals. Moving the SQUID to a remote site leads to several infrastructure-related problems including construction, power, data connectivity, and cryogenic cooling. This thesis investigates possible solutions to these problems and develops guidelines for designing future remote SQUID stations. A remote SQUID observatory typically consists of three structures placed approximately 40 m apart. These include: the control room, which houses all computers and supporting electronics, the power hut, which contains a regulated battery bank charged from a solar array that delivers DC power to the rest of the system, and the SQUID hut itself, which is thermally insulated by cavity walls. The SQUID is placed on an isolation pillar that decouples it from structural vibrations due to wind and outside temperature uctuations. The temperature inside the SQUID hut is also monitored as changes in temperature can result in small deformations of the SQUID mounting system which lead to changes in the SQUID's orientation. The changes in the orientation will appear as slow varying magnetic signals on the SQUID output. In principle, it is possible to compensate for these variations through post-processing. The SQUID needs to be cryogenically cooled to function. The SANSA SQUID is a High Temperature Superconductor (HTS) and operates using liquid nitrogen. Immersion cooling is used, as it is the simplest method, and produces the least amount of mechanical and electrical noise. Over time the liquid nitrogen will evaporate and needs to be replaced without significantly disrupting SQUID operations. A simple yet effective pumping scheme was developed that can transfer approximately 1.8 litres of liquid nitrogen every minute from a refill dewar. Monitoring of the liquid nitrogen level is an important management tool for a remote station, as refilling will be the primary reason for technicians to visit the site. The monitoring is achieved by placing the SQUID dewar on a specially designed non-magnetic load cell scale. The scale has been designed to limit the amount of tilting as the weight changes since this would also change the SQUID orientation. When a HTS SQUID is cooled in a large magnetic field, such as the Earth's field, Abrikosov vortices are likely to form in the superconducting material. As these vortices jump between pinning sites in the material, they increase the 1/f noise of the device and have been found to reduce the stability of the SQUID. Metal shields can be used to reduce the magnetic field, but are awkward to use and also reduce the magnitude of the signals of interest. In this thesis, a shielding method using Helmholtz coils is investigated. These coils are relatively simple and inexpensive to construct and do not attenuate the signals of interest. It was found that by cooling the SQUID in the reduced magnetic field, generated by the Helmholtz coils, the stability of the SQUID can be improved significantly.
AFRIKAANSE OPSOMMING: Die SQUID is die mees sensitiewe magneetveld sensors in die wêreld. Hierdie instrument kan slegs optimaal vir geometriese navorsing gebruik word indien dit ver van mensgemaakte magneetvelde opgestel word. Om die SQUID in 'n afgesonderde area op te stel veroorsaak verskeie probleme met betrekking tot infrastruktuur sover dit konstruksie, kragvoorsiening, en kriogeniese afkoeling aangaan. Hierdie tesis ondersoek moontlike oplossings vir die probleme en riglyne te ontwikkel vir die oprigting van toekomstige SQUID stasies. 'n Tipiese afgele SQUID observatorium bestaan gewoonlik uit 3 strukture wat 40m van mekaar opgestel is. Die beheerkamer bevat al die elektroniese apperaat, die kragkamer bevat 'n stel gereguleerde batterye wat deur sonpanele helaai word en DS krag verskaf aan die stasie en die SQUID-kamer wat deur middel van spoumure teen hitte gensoleer is. Die SQUID word op 'n gesoleerde pilaar geplaas om die invloed van vibrasies a.g.v. wind en wisselende buite temperature te verminder. Die temperatuur binne die SQUID kamer word ook noukeurig gemonitor aangesien wisseling in temperatuur geringe vervorming van die SQUID se montering kan veroorsaak wat 'n verandering van die SQUID se orintasie veroorsaak. Hierdie veranderings sal waargeneem word as stadige varirende sein in die SQUID se lesings. In beginsel is dit moontlik om vir dit te kompenseer deur middel van naprosessering. Die SQUID moet kriogenies afgekoel word om te funksioneer. Die SANSA SQUID is 'n Ho Temperatuur Supergeleier (HTS) en vloeibare stikstof word gebruik vir verkoeling. Afkoeling deur middel van indompeling word gebruik omdat dit die kleinste hoeveelheid meganiese en elektroniese versteuring veroorsaak. Die vloeibare stikstof verdamp mettertyd em moet vervang word sonder om die werking van die SQUID merkbaar te onderbreek. 'n Eenvoudige tog effektiewe oorpompstelsel is ontwikkel wat ongeveer 1.8 liter/minuut vloeibare stikstof vanuit 'n hervullings vakuum es kan oorpomp. Die meting van die vloeibare stikstof vlak is 'n belangrike aspek van die instandhouding van 'n afgele stasie aangesien dit die hoof rede sal wees vir tegnici om die perseel te besoek. Die meting word bewerkstellig deur die plasing van die SQUID se vakuum es op 'n spesiale ontwerpte, nie-magnetiese vrag sel skaal. Hierdie skaal is ontwerp om die mate van kanteling te beperk aangesien dit die orentasie van die SQUID kan benvloed. Wanneer 'n HTS SQUID binne in 'n groot magnetiese veld afgekoel word, is dit waarskynlik dat Abrikosov vortekse in die supergeleidende materiaal sal ontstaan. Soos hierdie vortekse rondspring in die materiaal vermeerder dit die 1/f ruis en daar is gevind dat die stabiliteit van die SQUID nadelig benvloed word. Metaal skilde kan gebruik word om die invloed van die magneetveld te verminder, maar is ongerie ik om te gebruik en verminder ook die sterkte van die seine wat waarneem wil word. In hierdie tesis word Helmholtz spoele ondersoek as 'n afskermings metode. Hierdie spoele is eenvoudig om te vervaardig en verminder nie die sterkte van waarneembare seine nie. Daar is gevind dat die stabiliteit van die SQUID merkbaar verbeter word deur afkoeling in 'n lae magnetiese veld soos bewerkstellig deur die Helmholtz spoele.
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Wang, Cong. "Optimal Design of District Energy Systems: a Multi-Objective Approach." Licentiate thesis, KTH, Installations- och energisystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192948.
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The aim of this thesis is to develop a holistic approach to the optimal design of energy systems for building clusters or districts. The emerging Albano university campus, which is planned to be a vivid example of sustainable urban development, is used as a case study through collaboration with the property owners, Akademiska Hus and Svenska Bostäder. The design addresses aspects of energy performance, environmental performance, economic performance, and exergy performance of the energy system. A multi-objective optimization approach is applied to minimize objectives such as non-renewable primary energy consumptions, the greenhouse gas emissions, the life cycle cost, and the net exergy deficit. These objectives reflect both practical requirements and research interest. The optimization results are presented in the form of Pareto fronts, through which decision-makers can understand the options and limitations more clearly and ultimately make better and more informed decisions. Sensitivity analyses show that solutions could be sensitive to certain system parameters. To overcome this, a robust design optimization method is also developed and employed to find robust optimal solutions, which are less sensitive to the variation of system parameters. The influence of different preferences for objectives on the selection of optimal solutions is examined. Energy components of the selected solutions under different preference scenarios are analyzed, which illustrates the advantages and disadvantages of certain energy conversion technologies in the pursuit of various objectives. As optimal solutions depend on the system parameters, a parametric analysis is also conducted to investigate how the composition of optimal solutions varies to the changes of certain parameters. In virtue of the Rational Exergy Management Model (REMM), the planned buildings on the Albano campus are further compared to the existing buildings on KTH campus, based on energy and exergy analysis. Four proposed alternative energy supply scenarios as well as the present case are analyzed. REMM shows that the proposed scenarios have better levels of match between supply and demand of exergy and result in lower avoidable CO2 emissions, which promise cleaner energy structures.QC 20160923
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Henderson, Janis L. "A Social Justice Framework Design an Optimal Learning Environment Model." Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/secfr-conf/2020/schedule/8.
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Optimal learning environments designs that move beyond traditional pedagogical considerations to include Social Justice concepts can be a challenge for educators in academic and practice contexts. The workshop promotes learning environments designs reflective of inclusiveness and members’ psychosocial safety. Inclusiveness reflects sensitivity to learner diversity and promotive of psychosocial safety, a term coined by the workshop facilitator. Psychological safety is operationalized as the offering and receiving of respect despite and because of one’s differences, a knowing uniqueness will be honored as will beliefs and course content understanding. Psychosocial safety flourishes in strengths-based, trauma-informed atmospheres. Additionally addressed are barriers to designing optimal learning environments, including solution strategies.
Experiential Learning Theory informs the workshop; experiential learning devices (e.g., reflexive activities, group discussions) encourage defining and refining workshop skills and strategies. The sensitive and culturally bound nature of social justice suggests use of scaffolding of strategies by educators to aid integration of learning.
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Agrawal, Rajiv. "A Constraint Management Approach for Optimal Design of Mechanical Systems." Connect to resource, 1991. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1225216291.
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Long, Craig Stephen. "Optimal structural design for a planar parallel platform for machining." Diss., Pretoria : [S.n], 2002. http://upetd.up.ac.za/thesis/available/etd-11302005-093541/.
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Li, Fengyi S. M. Massachusetts Institute of Technology. "A combinatorial approach to goal-oriented optimal Bayesian experimental design." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122376.
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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2019
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 83-87).
Optimal experimental design plays an important role in science and engineering. In many situations, we have many observations but only few of them can be selected due to limited resources. We then need to decide which ones to select based on our goal. In this thesis, we study the Bayesian linear Gaussian model with a large number of observations, and propose several algorithms for solving the combinatorial problem of observation selection/optimal experimental design in a goal-oriented setting. Here, the quantity of interest (QoI) is not the model parameters, but some (vector-valued) function of the parameters. We wish to select a subset of the candidate observations that is most informative for this QoI, in the sense of reducing its uncertainty. More precisely, we seek to maximize the mutual information between the selected observations and the QoI. Finding the true optimum is NP-hard, and in this setting, the mutual information objective is in general not submodular. We thus introduce several algorithms that approximate the optimal solution, including a greedy approach, a minorize-maximize approach employing modular bounds, and certain score-based heuristics. We compare the computational cost these algorithms, and demonstrate their performance on a synthetic data set and a real data set from a climate model.
Support from Department of Energy
by Fengyi Li.
S.M.
S.M. Massachusetts Institute of Technology, Department of Aeronautics and Astronautics
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Kalyan, Vivek. "A Strategy to Design The Optimal Asian Indian Kitchen In The United States." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1314115138.
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Valenzuela, Pacheco Patricio E. "Optimal input design for nonlinear dynamical systems : a graph-theory approach." Licentiate thesis, KTH, Reglerteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-155136.
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Optimal input design concerns the design of an input sequence to maximize the information retrieved from an experiment. The design of the input sequence is performed by optimizing a cost function related to the intended model application. Several approaches to input design have been proposed, with results mainly on linear models. Under the linear assumption of the model structure, the input design problem can be solved in the frequency domain, where the corresponding spectrum is optimized subject to power constraints. However, the optimization of the input spectrum using frequency domain techniques cannot include time-domain amplitude constraints, which could arise due to practical or safety reasons. In this thesis, a new input design method for nonlinear models is introduced. The method considers the optimization of an input sequence as a realization of the stationary Markov process with finite memory. Assuming a finite set of possible values for the input, the feasible set of stationary processes can be described using graph theory, where de Bruijn graphs can be employed to describe the process. By using de Bruijn graphs, we can express any element in the set of stationary processes as a convex combination of the measures associated with the extreme points of the set. Therefore, by a suitable choice of the cost function, the resulting optimization problem is convex even for nonlinear models. In addition, since the input is restricted to a finite set of values, the proposed input design method can naturally handle amplitude constraints. The thesis considers a theoretical discussion of the proposed input design method for identification of nonlinear output error and nonlinear state space models. In addition, this thesis includes practical applications of the method to solve problems arising in wireless communications, where an estimate of the communication channel with quantized data is required, and application oriented closed-loop experiment design, where quality constraints on the identified parameters must be satisfied when performing the identification step.QC 20141110
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Bryggman, Elin. "Optimal "Belt-in-Seat" : A study to evaluate the optimal positioning of a Belt in a car's frontal seats." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79807.
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The world is continuously moving, and so are the life on it. As our society is constantly evolving and the width of human needs are rising, do organization need to provide new solutions that can satisfy our needs. Consequently, every designer is going to meet new challenges whenever the situation calls for it. This is the situation that CEVT’s engineers have found themselves in and the reason as to why this engineering project has become relevant for their industrial development and innovation. The seatbelt designers at CEVT’s Restraints department have encountered a situation where it forces them to change their product as it can no longer be installed in the cars’ B-pillars. The company must investigate alternative positionings with regard to the car's new design criteria in order to recreate or improve the functionalities in both safety and comfort of their seatbelt system. My project objective is to investigate alternative positionings and components that are part of the classic three-point seatbelt system with an aim to ensure good user experience in the area of comfort. By the end of this thesis I ought to have answered the following Mission Statement: “Determine the most optimal positioning and components of the seatbelt system to reduce inertia for a fontal Belt-in-Seat, where the system’s performance should be comparable to the users’ experience from an installation of a seatbelt in a B-pillar.” To establish the best component combination out of the parts delivered from Autoliv AB and secure an optimal placement for the involved parts, have I followed the three-stage process described by IDEO (2015). The Inspiration phase has included a Literature study, benchmarking, analytical assessments of user needs as well as prepared and performed of a test on the seatbelt system. The Ideation phase was focusing on establishing a placement for the system's components through a brainstorming so that it could be mounted in a seat prototype prepared for the user experience tests performed. The last phase, Implementation, consisted of an analysis that was focusing on the feedback received from users of different anthropometry. But also concentrated on summarizing all data collected throughout the project to select the final concept for this assignment.Världen och allt liv på jorden är i ständig rörelse. När samhället strävar efter utveckling uppkommer samtidigt nya behov hos människan och dess omgivning, vilket gör att olika organisationer och företag behöver leverera nya lösningar och designa artefakter för att tillfredsställa människans behov. Varje designer kommer att möta nya utmaningar när en situation tvingar dem att ändra sina produkter. Detta är en situation som CEVT:s bilbältesdesigners står inför och anledningen till att detta arbete blivit aktivt för företagets industriella utveckling inom innovation. Situationen som tvingar konstruktörerna att ändra bältessystemets design är att systemet inte längre kan monteras i passagerarbilens B-stolpar. Därför måste företaget undersöka alternativa positioneringar som överensstämmer med bilens designkriterier för att återskapa bältets funktionalitet som berör både säkerhet och komfort av deras bältessystem. Arbetets syfte är att undersöka alternativa positioneringar och de inkluderade komponenterna som utgör ett klassiskt tre-punkts bälte med målet att säkerställa en god användarupplevels inom området komfort. I slutet av projektet skall jag ha uppfyllt följande Mission Statement: “Bestäm den mest optimala positioneringen och komponenter av ett säkerhetsbältes system för att reducera krafterna från ett bältes-integrerat framsäte, en ’Belt-in-Seat’, där systemets prestandard skall vara jämförbart med användarens upplevelse av en installation av bältet i bilens B-stolpe.” Jag har följt IDEOs (2015) tre-stegs process för att säkerställa den bästa kombinationen av komponenter som har tillhandahållits av Autoliv AB samt fastställa en optimal placering av varje komponent i systemet. Inspirationsfasen har inkluderat en litteraturstudie, benchmarking, analytiska bedömningar av användarens behov samt förberett och genomfört ett test på bältesystemets prestandard. Ideationsfasen fokuserade på att etablera en placering för systemets komponenter genom en brainstorming så att dessa kunde monteras i en sätesprototyp som förberetts inför testerna för att evaluera användarens komfortupplevelse. Den sista fasen, Implementation, bestod av en analys som fokuserade på feedbacken från testpersonerna som erhöll olika antropometri. Fasen kretsade kring att sammanfatta all data som samlats in genom hela projektet för att välja det slutliga konceptet för uppgiften.
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Harrington, William Burke. "Optimal linear quadratic Gaussian controller design for a flexible spacecraft simulator." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA305581.
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Huang, Haidong. "Optimal design of a flying-wing aircraft inner wing structure configuration." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7439.
Full textAbstract:
Flying-wing aircraft are considered to have great advantages and potentials in
aerodynamic performance and weight saving. However, they also have many
challenges in design. One of the biggest challenges is the structural design of
the inner wing (fuselage). Unlike the conventional fuselage of a tube
configuration, the flying-wing aircraft inner wing cross section is limited to a
noncircular shape, which is not structurally efficient to resist the internal
pressure load. In order to solve this problem, a number of configurations have
been proposed by other designers such as Multi Bubble Fuselage (MBF),
Vaulted Ribbed Shell (VLRS), Flat Ribbed Shell (FRS), Vaulted Shell
Honeycomb Core (VLHC), Flat Sandwich Shell Honeycomb Core (FLHC), Y
Braced Box Fuselage and the modified fuselage designed with Y brace
replaced by vaulted shell configurations. However all these configurations still
inevitably have structural weight penalty compared with optimal tube fuselage
layout. This current study intends to focus on finding an optimal configuration
with minimum structural weight penalty for a flying-wing concept in a preliminary
design stage.
A new possible inner wing configuration, in terms of aerodynamic shape and
structural layout, was proposed by the author, and it might be referred as
‘Wave-Section Configuration’. The methodologies of how to obtain a structurally
efficient curvature of the shape, as well as how to conduct the initial sizing were
incorporated.
A theoretical analysis of load transmission indicated that the Wave-Section
Configuration is feasible, and this was further proved as being practical by FE
analysis. Moreover, initial FE analysis and comparison of the Wave-Section
Configuration with two other typical configurations, Multi Bubble Fuselage and
Conventional Wing, suggested that the Wave-Section Configuration is an
optimal design in terms of weight saving. However, due to limitations of the
author’s research area, influences on aerodynamic performances have not yet
been taken into account.
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Laws, David Joseph. "A Bayes decision theoretic approach to the optimal design of screens." Thesis, University of Newcastle Upon Tyne, 1997. http://hdl.handle.net/10443/648.
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An item may be said to reach a standard suitable for use if it has some prescribed attributes. Supposet hat a variable 2: measurest he standard and TE, qT. if an item has the desired attributes. The variable -T may be very expensive to measure and so, some cheaper to measure screening variables, X say, correlated to I may be used to classify items. The purpose of screen design is to determine CX, the region of X space, for which an item should be said to reach the standard. If the error probabilities of classifying an item based on X are very high it may be economical to measure IT. Chapter 2 deals with this idea in the context of a very simple two-stage set-up in which, at the first stage of the screen a univariate screening variable X is measured. Some items are sentenced as acceptable or unacceptable, and the remainder are passed on to the second stage at which T is determined. The optimal screen is found that minimises cost, where costs are given for misclassifying items and for measuring the variables. The variable T is assumed binary and the model for TIX is a probit regression model. In designing a two-stage screen, Chapter 3 considers: (a) a general stochastic structure for (1, X), (b) a general loss function set up for misclassification costs and (c) assumes no fixed form for the screen. Also in Chapter 3, we consider a scenario in which a statistical goal or constraint is imposed in addition to the decision-theoretic target of minimising expected cost. In Chapter 4 we consider a sequential screen that operates as follows. At each stage of a sequence a covariate is measured and items may be accepted as suitable, discarded or passed on to the next stage. At the final stage the performance variable T is measured. Returning to the simple one-stage screen based solely on measuring covariates, Chapter 5 poses the question of how many and which covariates to include as part of the screen.
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Alkhatib, Husam. "Developing an Optimal Design for A Heart Container Operated Via Drone." Thesis, KTH, Medicinteknik och hälsosystem, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-249681.
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In the healthcare system when a patient is waiting for a donated heart, the choice of the transportation method is critical. Thus, the efficiency of this procedure relies on the traveling time, which could affect the ischemic time, which is the time that heart can be discharged outside the human body. For best patient outcome, the heart has to be transplanted within four hours from the donor to the recipient. By transporting the donated heart via Unmanned Aerial Vehicle (UAV, or drone), both the time and the cost required for the heart transportation will be minimized. This thesis intends to explore the specifications needed for the design and manufacture of a heart container and pick-up system for a drone, which will be able to transport a donated heart between hospitals.
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Shah, Mahesh. "A heuristic method for the optimal design of water distribution systems." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/88600.
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The water distribution system design problem consists of finding a minimum cost combination of network layout and sizes of system components so as to satisfy flow demands, minimum and maximum head requirements and a reliability criterion. A two step procedure is proposed to find a near optimal design. The first step considers obtaining a near optimal tree layout using a heuristic tree search algorithm. Two different methods are followed for the tree search - one for single source networks and the other for multiple source networks. The second step adds loop forming redundant links to the tree layout in such a way that every demand node has two paths from source node(s). The methodology is applied to a single source network and a multiple source network. In both the cases better results arc achieved than those obtained previously by other researchers.Master of Science
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FRANCHI, LORIS. "A Robust and Optimal Multidisciplinary Approach For Space Systems Conceptual Design." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2770676.
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Niewenhuis, Benjamin T. "A Logic Test Chip for Optimal Test and Diagnosis." Research Showcase @ CMU, 2018. http://repository.cmu.edu/dissertations/1176.
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The benefits of the continued progress in integrated circuit manufacturing have been numerous, most notably in the explosion of computing power in devices ranging from cell phones to cars. Key to this success has been strategies to identify, manage, and mitigate yield loss. One such strategy is the use of test structures to identify sources of yield loss early in the development of a new manufacturing process. However, the aggressive scaling of feature dimensions, the integration of new materials, and the increase in structural complexity in modern technologies has challenged the capabilities of conventional test structures. To help address these challenges, a new logic test chip, called the Carnegie Mellon Logic Characterization Vehicle (CM-LCV), has been developed. The CM-LCV utilizes a two- dimensional array of functional unit blocks (FUBs) that each implement an innovative functionality. Properties including fault coverage, logical and physical design features, and fault distinguishability are shown to be composable within the FUB array; that is, they exist regardless of the size and composition of the FUB array. A synthesis ow that leverages this composability to adapt the FUB array to a wide range of test chip design requirements is presented. The connection between the innovative FUB functionality and orthogonal Latin squares is identified and used to analyze the universe of possible FUB functions. Two additional variants to the FUB array are also developed: heterogenous FUB arrays utilize multiple FUB functions to improve the synthesis ow performance, while pipelined FUB arrays incorporate sequential circuit elements (e.g., ip- ops and latches) that are absent from the original combinational FUB array. In addition to the design of the CM-LCV, methods for testing it are presented. Techniques to create minimal sets of test patterns that exhaustively exercise each FUB within the FUB array are developed. Additional constraints are described for the heterogenous and pipelined FUB arrays that allow these techniques to be applied for both variant FUB arrays. Furthermore, a simple built-in self test (BIST) scheme is described and applied to a reference design, resulting in a 88.0% reduction in the number of test cycles required without loss in fault coverage. A hierarchical FUB array diagnosis methodology (HFAD) is also presented for the CM- LCV that leverages its unique properties to improve performance for multiple defects. Experiments demonstrate that this HFAD methodology is capable of perfect accuracy in 93.1% of simulations with two injected faults, an improvement on the state-of-the-art commercial diagnosis. Additionally, silicon fail data was collected from a CM-LCV manufactured using a 14nm process by an industry partner. A comparison of the diagnosis results for the 1,375 fail logs examined shows that the HFAD methodology discovers additional defects during multiple defect diagnosis that the commercial tool misses for 40 of the diagnosed fail logs. Examination of these cases shows that the additional defects found by the HFAD methodology can result in improved diagnosis confidence and more precise descriptions of the defect behavior(s). The contributions of this dissertation can thus be summarized as the description of the design, test, and diagnosis of a new logic test chip for use in yield learning during process development. This CM-LCV can be adapted to meet a wide range of test chip requirements, can be efficiently and rigorously tested, and exhibits properties that can be used to improve diagnosis outcomes. All of these claims are validated through both simulated experiments and silicon data.
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Cheng, Hua-Yi, and 程華懿. "Bayes a-optimal row-column design." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/96822946732250101093.
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Chen, Hung-Wen, and 陳鴻文. "Optimal design of a thermoacoustic refrigerator." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/74887104456693867006.
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碩士國立彰化師範大學
車輛科技研究所
102
This study investigates the performance of the thermoacoustic refrigerator using the optimal design used in the vehicle air conditioning system. The configuration of standing-wave thermoacoustic refrigeration system is simple. It contains a driver, a resonator, porous stack and two heat exchangers. The advantages are cheaper cost, easy making and it does not require the use of harmful chemicals. The thermoacoustic refrigerator uses sound waves to drive, so no operation of the device and can reduce frequent repairs. The thermoacoustic refrigerator has been regarded as a new generation of refrigeration and air conditioning products. Thermoacoustic refrigerator is to use thermoacoustic effect to transfer sound energy into heat energy achieving the cooling effect. This study uses a large number of non-dimensional design parameters to simulate the way to find the optimal design parameters. The experiment has been carried out to achieve the maximum performance and the actual simulation parameters to produce a thermoacoustic refrigerator.
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Lu, Yu-Wang, and 呂有旺. "Optimal Design of a Motorcycle Shock Absorber." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/05189330845531380131.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
87
The shock absorber is the major component of the motorcycle suspension system and also is a key point in appraising the motorcycle performance, therefore the improvement design of the shock absorber is always important in the current motorcycle industry. The theoretical model of the whole shock absorber system and each of its components is built up first, and then through the numerical simulation, reasons of the compression lag weakness of the motorcycle shock absorber are found, and the ways of improvements are also suggested. In the optimal design process, the damping force caused by the viscous oil inside the shock absorber and the square error of the designed damping force is taken as the objective function. By adjusting of the blade thickness of the control valve, the area of the valve port and the reserve chamber pressure, the compression lag weakness of a motorcycle’s shock absorber can be thoroughly improved.
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Yin, Yue. "A-optimal Minimax Design Criterion for Two-level Fractional Factorial Designs." Thesis, 2013. http://hdl.handle.net/1828/4865.
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In this thesis we introduce and study an A-optimal minimax design criterion for two-level fractional factorial designs, which can be used to estimate a linear model with main effects and some interactions. The resulting designs are called A-optimal minimax designs, and they are robust against the misspecification of the terms in the linear model. They are also efficient, and often they are the same as A-optimal and D-optimal designs. Various theoretical results about A-optimal minimax designs are derived. A couple of search algorithms including a simulated annealing algorithm are discussed to search for optimal designs, and many interesting examples are presented in the thesis.Graduate
0463
yinyue@uvic.ca
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Bharti, Smita. "Optimal structural design of a morphing aircraft wing." 2007. http://www.etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1943/index.html.
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Shiu, Ting-Yau, and 許庭耀. "Optimal Performance Design For A Variable Throat Ejector." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/29271964948933079244.
Full textAbstract:
碩士國立臺灣大學
機械工程學研究所
98
For solar-driven ejector refrigeration system, operating temperature may change with the variation in solar radiation and ambient temperature. Thus, a conventional fixed throat area ejector may not work at its optimal performance. In this study, a variable ejector has been designed, which incorporates a needle into the ejector. This allows the primary throat area to be changed by adjusting the position of the needle. By means of this controlled needle modification, an unsteady operating temperature can be taken into account. For a given throat area, an optimum generator temperature exists at which the critical condenser temperature is the same as the actual condenser temperature. A regressive equation, related to the corresponding optimum throat area ratio with respect to the operating conditions, is obtained. A3/At=0.71701Tg-0.0196Te+0.70234Tc+ 0.00204TgTe-0.01185TgTc-0.00257TeTc-43.9477. From the practical operating point of view, if the generator, evaporator or condenser temperature is measured out, the ejector can be adjusted to the corresponding optimal throat area ratio using the equation. The system then operates with optimal performance.
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Lin, Cheng-Hui, and 林承輝. "Optimal frequency design of a tristable compliant mechanism." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/39052278937798299873.
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碩士國立中興大學
精密工程學系所
103
In this research, an optimal design of a tristable compliant mechanism with specified resonant frequencies is presented. A genetic algorithm combined with a finite element analysis is considered in the optimization process. A prototype is fabricated by a computer numerical control engraving machine. The procedure to generate a G code for device fabrication is described.
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Chang, Chun-Yao, and 張淳堯. "Optimal design of a DC micro-plasma electrode." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/77689553717416274024.
Full textAbstract:
碩士國立中興大學
機械工程學系所
103
Recent progress in atmospheric plasma has lead to a widespread application of plasma technology in medicine, such as surface modification of biomaterials and sterilization of medical instruments and materials. Recently, applications have been further spread to the direct treatment of cell using plasma. Plasma can cause electrical, chemical, optical, and thermal effects on biological tissue and can be used for hemostasis, cell proliferation, and tissue reconstruction. If the interactions between plasma and cells can be well investigated by a practical device, it will be contribute to the development of therapeutically applicable plasma. Plasma-on-Chip (POC) devices have been developed to achieve plasma treatment of individual cell. However, the micro cathode of a POC can be easily damaged during the plasma firing. In this study, an optimal DC micro-plasma electrode was designed to enhance the lifetime of the plasma electrode while the micro plasma characteristic can still be achieved. The electrode that composed of a 20 nm titanium layer and a 200 nm gold layer on a silicon substrate was fabricated through photolithography and evaporation. Experimental results illustrated that a micro electrode with a blunt-ended cathode and a flat anode could enhance the firing life-time as many as 30 folds of a double tip electrode. We also fabricated a pure titanium electrode (220 nm in thick) for further prolonging the lifetime of the electrode. Experimental results showed that the pure titanium electrode could further increase the life-time for 60 folds when compared with an Au/Ti hybrid electrode. However, the voltage requirement for the pure titanium electrode is higher than the Au/Ti electrode only by 20 V. The pure titanium microelectrode proposed in this study processes advantages such as low cost, simple fabrication process, and high biocompatibility. Hence, it is highly feasible for POC applications.
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Lai, Jian-Shiun, and 賴建勳. "A Study on Optimal Transformer Design for VCO." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/73803312805918095075.
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碩士國防大學理工學院
電子工程碩士班
99
This thesis proposed a Voltage Controlled Oscillator operate at 5.3 GHz, and to optimize the transformers used in voltage controlled oscillators, and to get a low-power and low-noise output stability under the conditions of local oscillation signal to be applied to FMCW radar sensor. We studied and analyzed several inductance calculation algorithms including Greenhouse and Jenei algorithm of physic-based. Consistent with the results of this study to find out the best performance of the transformer core resonant components. This thesis is based on TSMC CMOS 0.18 μm process to design the circuit and also applies Ansoft HFSS tool to design the transformers. Finally integrate the circuit in ADS tools. The conclusion of the thesis has realized and fitted in the FMCW radar system. According to the proposed circuit phase noise is -128.0 dBc at 1-MHz offset from a 5.3 GHz carrier and its tuning range is 400MHz from 5.1 to 5.5 GHz with power consumption of 4.1mW.
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Wu, Yen-ting, and 吳燕婷. "Optimal Design of a Cam-Linkage Ram Mechanism." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/04473963168066710022.
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碩士國立成功大學
機械工程學系碩博士班
97
Sometimes, products with few quantities but various shapes (or types) are needed. If using mechanical presses to produce them, the ram motions and the strokes of the presses should be adjustable. Servo-presses and hybrid presses are able to satisfy these requirements. However, the servo-press needs a servo-motor and suits works with low ram forces; and the hybrid press requires a normal motor and an extra servo motor which increases its cost. In this study, a six-bar cam-integrated linkage is proposed to be the ram mechanism, whose crank can be driven by an ordinary motor, and the cam is also driven by the motor with the aid of a transmission, such that the crank and the cam rotate with the same speed and direction. To satisfy different specifications of the ram motions and the strokes, the cam and some links of the mechanism need be replaced. Thus, the other concern of this research is to develop the methodology to determine the dimensions of the new cams and new links needed to satisfy the requirements. Based on the inverse kinematic analysis, the model for determining the cam contour is developed. Consequently, that of curvature analysis is built by using differential geometry. Furthermore, the models of kinematic and kinetostatic analyses are developed. Based on these, an optimal design model of the mechanism is proposed. The object is to maximize the mechanical advantage. The design variables include the dimensions of the cam, links and spring. Various constraints, such as space limitations, bearing loads, cam stress, etc., are considered. Two examples of the design and analysis of presses for precision cutting and precision drawing, respectively, are included to demonstrate the usage of the proposed models and the characteristics of the designed mechanisms. Based on the results, not only the proposed mechanisms are feasible and usable, but their mechanical advantages are increased, their input torques are reduced. It is expected that the results of this study have aids on the design and analysis of ram mechanisms in mechanical presses.
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Chen, Wen-Shun, and 陳文雄. "Optimal capacity design for a small cogeneration system." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/92634583042430495819.
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碩士清雲科技大學
電機工程研究所
93
This proposal is concerned with the design and analysis of a small cogeneration system to provide reliability and stability electricity for the high-tech plant. This paper also analysis the cost of the plant facility and the economic tracking on the operation and maintenance of the cogeneration using economic and effective method to improve the power quality for the high-tech plant. According as the cost of the steam, hot-water and electricity demand in the high-tech plant to be the object function, the genetic algorithm was used to design the optimal capacity distribution to fit in with the optimal heat efficiency for the cogeneration system. The program was written in Delphi5.0 software to let operator analysis design small cogeneration system more easily. The detail analyses was made on data obtained from the existing cogeneration system, especially on the cost analyses on income capital investment and return earning ratio to demonstrate the theory and justify the analysis. This paper can aid the user to design the steam and electricity capacity operation model on the cogeneration system to provide the constant and stable electricity for the high-tech plant. Using the water of engine clamp cover to control clean room and make surplus steam use to the absorption chiller fully uses the waste heat energy .The result of this paper can reduce the energy waste due to design operation mode mistake. The economic evaluation data can benefit the users in this high-tech.
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Hsiang-ChienHsieh and 謝祥謙. "Optimal Design of a Wearable Upper Limb Exoskeleton." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/15164929665935162904.
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Tsao, Po Wei, and 曹柏瑋. "Optimal frequency design of a bistable energy harvester." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/83435361821034533196.
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碩士國立中興大學
精密工程學系所
102
The design of a bistable mechanism with a specified resonant frequency by an optimization approach is presented. This optimization approach combines finite element analyses and a genetic algorithm. Quick design of a compliant bistable mechanism with a specified resonant frequency is achieved. A prototype of the designed device is fabricated. The experimental results confirm that the prototype has bistability and the specified resonance frequency.
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Hsu, Yau-Chung, and 許耀中. "A Design of Optimal Human Resource Allocation System." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/z5eh2u.
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碩士國立臺北科技大學
商業自動化與管理研究所
94
Most enterprises have their own human resource database. However, businesses encounter difficulties in quickly and efficiently finding suitable personnel out of huge staff when they are in need. Due to not-well-shared information among departments, inexperienced managers, and other problems, businesses cannot have a comprehensive knowledge about the abilities or characteristics of their staff. Therefore, they have a hard time organizing an optimal work group that can successfully solve problems. In hence, the purpose of this research is to consider the possible limits in various alternatives, such as the diploma and seniority of staff, non-overloading, the concordance of cooperation between staffs…etc. We will apply the Integer programming to solve the problem of optimal covering of competence sets to find out a group of most suitable solution. Moreover, we use Deduction Graph to let decision makers understand the competence sets expansion situation of their staffs clearly. At last, based on the method above-mentioned, we will design and implement a Decision Support System. With this system, decision makers are able to achieve more efficient and accurate decision-making and to optimize their human resource allocation.
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Lee, KUO-PIN, and 李國斌. "A Realistic Optimal Controller Design for a Brushless DC Motor." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/yc39yv.
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碩士中原大學
電機工程研究所
92
Abstract Investigated in this thesis is the application of an adaptive genetic algorithm (AGA) for searching optimal parameters of a fuzzy sliding mode controller (FSMC) for a DC brushless rotary motor position control system. Considering that the simulation results for optimal controllers can hardly be used directly in a real system unless through some manual adjustment, this research used a digital signal processor (DSP) as a data transmission path between the DC brushless rotary motor and a personal computer to gain real responses for controller design and performance evaluation. The structure of the control algorithm in this thesis is to combine fuzzy control with sliding mode control. In optimization for control algorithm, there are two parts of parameters. One is the fuzzy rule; the other is the controller gains. The simulation software Matlab/Simulink is to used to build up fuzzy rules, and then together with controller gains are searched by an AGA to attain their optimal values. The experimental results show that the FSMC is highly robust when the plant model has some uncertainties, and the optimal FSMC designed by AGA can track position command rapidly.