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Relevant bibliographies by topics / Helicopters – Design and construction – Estimates / Dissertations / Theses

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Dissertations / Theses on the topic 'Helicopters – Design and construction – Estimates'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Kim, Ho-Sik. "Conceptual design optimization for military helicopter maneuverability and agility." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/11969.

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2

Tai, Jimmy C. M. "A multidisciplinary design approach to size stopped rotor/wing configurations using reaction drive and circulation control." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/13460.

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3

Tatossian, Charles A. "Aerodynamic shape optimization via control theory of helicopter rotor blades using a non-linear frequency domain approach." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112586.

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This study presents a discrete adjoint-based aerodynamic optimization algorithm for helicopter rotor blades in hover and forward flight using a Non-Linear Frequency Domain approach. The goal is to introduce a Mach number variation into the Non-Linear Frequency Domain (NLFD) method and implement a novel approach to present a time-varying cost function through a multi-objective adjoint boundary condition. The research presents the complete formulation of the time dependent optimal design problem. The approach is firstly demonstrated for the redesign of a NACA 0007 and a NACA 23012 helicopter rot

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4

Baker, Andrew Paul. "The role of mission requirements, vehicle attributes, technologies and uncertainty in rotorcraft system design." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/12476.

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5

Visagie, Jonathan Gerhardus. "Stability and control characteristics of model helicopters." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/50102.

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Thesis (MScEng)--University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: A need exists for the development of an unmanned rotorcraft capable of autonomous flight, as would be required for the survey of high voltage electricity supply lines. A program was initiated at the University of Stellenbosch in December 2002 in order to develop such an aircraft. The first goal of this thesis was the development of software that could calculate the stability and control derivatives of a model helicopter. These derivatives could then be used in the formulation of an appropriate helicopter control s

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6

Yue, Andrew. "H∞-design and the improvement of helicopter handling qualities." Thesis, University of Oxford, 1988. http://ora.ox.ac.uk/objects/uuid:4468a3ab-7297-4363-b605-b3e1f301d11b.

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This thesis presents the results of a study into the use of H<sup>ꝏ</sup>-optimization for the design of feedback control laws for improving the handling qualities of a Lynx helicopter. An important improvement to the H<sup>ꝏ</sup>-optimization procedure is the reduction in the number of iterative steps in the γ-iteration before convergence to the optimal γ. Some new algorithms are derived which significantly reduce the computation time for the γ-iteration. Both 2-block and 4-block cases are considered. Control laws are designed for precise control of pitch and roll attitude, yaw rate and heav

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7

Davis, Joseph Hutson. "Design Methodology for Developing Concept Independent Rotorcraft Analysis and Design Software." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19721.

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Throughout the evolution of rotorcraft design, great advancements have been made in developing performance analysis and sizing tools to assist designers during the preliminary and detailed design phases. However, very few tools exist to assist designers during the conceptual design phase. Most performance analysis tools are very discipline or concept specific, and many are far too cumbersome to use for comparing vastly different concepts in a timely manner. Consequently, many conceptual decisions must be made qualitatively. A need exists to develop a single software tool which is capable o

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8

Thériault, France. "Optimized design of a composite helicopter structure by resin transfer moulding." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99795.

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This research project is partnership project involving industrial, university and government collaborators. The overall objective is to develop and enhance tools for use in Resin Transfer Moulding (RTM) design technology in order to re-design existing metallic parts using composite materials.<br>The specific objective of this work is to present preliminary research findings of the development of an optimized design of a leading edge slat (horizontal stabilizer component) from the Bell Model 407 Helicopter. The results presented here focus on the static stress analysis and the structure design

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9

Johnson, Kevin Lee. "Prediction of operational envelope maneuverability effects on rotorcraft design." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47601.

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Military helicopter operations require precise maneuverability characteristics for performance to be determined for the entire helicopter flight envelope. Historically, these maneuverability analyses are combinatorial in nature and involve human-interaction, which hinders their integration into conceptual design. A model formulation that includes the necessary quantitative measures and captures the impact of changing requirements real-time is presented. The formulation is shown to offer a more conservative estimate of maneuverability than traditional energy-based formulations through quantitat

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10

Suhr, Stephen Andrew. "Preliminary Turboshaft Engine Design Methodology for Rotorcraft Applications." Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14128.

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In the development of modern rotorcraft vehicles, many unique challenges emerge due to the highly coupled nature of individual rotorcraft design disciplines therefore, the use of an integrated product and process development (IPPD) methodology is necessary to drive the design solution. Through the use of parallel design and analysis, this approach achieves the design synthesis of numerous product and process requirements that is essential in ultimately satisfying the customers demands. Over the past twenty years, Georgia Techs Center for Excellence in Rotorcraft Technology (CERT) has contin

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11

Shi, Xin, and 施歆. "A fuzzy reasoning cost estimation model of sustainable building refurbishment solutions for residential buildings in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208599.

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The global climate has been affected adversely due to the emissions of large amount of greenhouse gases (GHGs) and there is an urgent need for emissions reduction. Carbon dioxide is a major greenhouse gas and the reduction of its emissions is indispensable to the achievement of sustainable development. The building sector is a major source of carbon dioxide emissions and one way to reduce the emissions is uplifting the energy efficiency of existing buildings by conducting sustainable building refurbishment. As cost would affect the decisions on sustainable building refurbishment strategies, it

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12

Membah, Joseph F. J. "Parametric Cost Estimating and Risk Analysis of Transportation Tunneling Projects." Diss., North Dakota State University, 2016. http://hdl.handle.net/10365/25908.

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Due to the increased scrutiny of construction costs for infrastructure projects by the public and legislators, it is becoming increasing important for project developers to prepare accurate conceptual cost estimates for transportation tunnel projects at the feasibility stage to aid in making investment decisions. Past studies have emphasized that tunnel-project costs have been significantly underestimated, and cost uncertainties and risks have been identified as the cause of cost under or overestimation. A broad understanding of the factors that contribute to cost underestimation is impo

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13

Farah, Toni E. "Review of current estimating capabilities of the 3d building information model software to support design for production/construction." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-082305-165125/.

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14

Oralkan, Gaye A. "An object-oriented design intent externalization and representation model for cost estimating applications." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10222009-125049/.

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15

Alabi, Bimpe Omolara. "Effect of building materials cost on housing delivery towards sustainability." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2635.

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Thesis (MTech (Construction Management))--Cape Peninsula University of Technology, 2017.<br>The study investigates the predominant factors responsible for increase in the cost of building materials and the effect of this cost increase on housing delivery in Western Cape, South Africa. Sustainable housing is buildings produced to meet the present housing needs of people without conceding the ability of the future generation to meet their future needs. However, a significant increase in the cost of building materials has been a major constraint to the delivery of sustainable housings, as made e

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16

Jeram, Geoffrey James Joseph. "Open Platform for Limit Protection with Carefree Maneuver Applications." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4933.

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This Open Platform for Limit Protection guides the open design of maneuver limit protection systems in general, and manned, rotorcraft, aerospace applications in particular. The platform uses three stages of limit protection modules: limit cue creation, limit cue arbitration, and control system interface. A common set of limit cue modules provides commands that can include constraints, alerts, transfer functions, and friction. An arbitration module selects the best limit protection cues and distributes them to the most appropriate control path interface. This platform adopts a holistic ap

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17

Riviello, Luca. "Rotorcraft trim by a neural model-predictive auto-pilot." Thesis, Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-04142005-203616/unrestricted/riviello%5Fluca%5F200505%5Fmast.pdf.

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Thesis (M. S.)--Aerospace Engineering, Georgia Institute of Technology, 2005.<br>Bottasso, Carlo, Committee Chair ; Hodges, Dewey, Committee Member ; Bauchau, Olivier, Committee Member. Includes bibliographical references.

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18

Yokota, Alessandra Akemi 1988. "Aplicação do custeio-meta no processo de projeto em habitação de interesse social." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258730.

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Orientador: Ariovaldo Denis Granja<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo<br>Made available in DSpace on 2018-08-27T20:19:50Z (GMT). No. of bitstreams: 1 Yokota_AlessandraAkemi_M.pdf: 5943613 bytes, checksum: 29b2af76a45e062a4fc32ae5d1fe42c1 (MD5) Previous issue date: 2015<br>Resumo: Na abordagem do Custeio-Meta (CM), o custo é um parâmetro de entrada que norteia o processo de projeto, salvaguardando-se os requisitos de qualidade e o desempenho de suas funções na percepção do cliente ou usuário final para o alcanc

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19

Agarwal, Sandeep. "Aeromechanical Stability Augmentation Using Semi-Active Friction-Based Lead-Lag Damper." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7547.

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Lead-lag dampers are present in most rotors to provide the required level of damping in all flight conditions. These dampers are a critical component of the rotor system, but they also represent a major source of maintenance cost. In present rotor systems, both hydraulic and elastomeric lead-lag dampers have been used. Hydraulic dampers are complex mechanical components that require hydraulic fluids and have high associated maintenance costs. Elastomeric dampers are conceptually simpler and provide a ``dry" rotor, but are rather costly. Furthermore, their damping characteristics can degrade w

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20

Riddell, Kevin Donald Alexander. "Design, testing and demonstration of a small unmanned aircraft system (SUAS) and payload for measuring wind speed and particulate matter in the atmospheric boundary layer." Thesis, Arts and Science, 2014. http://hdl.handle.net/10133/3416.

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The atmospheric boundary layer (ABL) is the layer of air directly influenced by the Earth’s surface and is the layer of the atmosphere most important to humans as this is the air we live in. Methods for measuring the properties of the ABL include three general approaches: satellite-based, ground- based and airborne. A major research challenge is that many contemporary methods provide a restricted spatial resolution or coverage of variations of ABL properties such as how wind speed varies across a landscape with complex topography. To enhance our capacity to measure the properties of the ABL, t

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21

Unnikrishnan, Suraj. "Adaptive Envelope Protection Methods for Aircraft." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11478.

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Carefree handling refers to the ability of a pilot to operate an aircraft without the need to continuously monitor aircraft operating limits. At the heart of all carefree handling or maneuvering systems, also referred to as envelope protection systems, are algorithms and methods for predicting future limit violations. Recently, envelope protection methods that have gained more acceptance, translate limit proximity information to its equivalent in the control channel. Envelope protection algorithms either use very small prediction horizon or are static methods with no capability to adapt to cha

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22

Cohen, Gary M. "A design study of a scale model bearingless helicopter rotor system using composite materials." Thesis, 1991. http://hdl.handle.net/10539/22844.

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A thesis submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfillment of the requirements for the degree of Master of Science in Engineering.<br>The use of advanced composite materials in helicopter rotor systems offers opportunities for improvements in aerodynamic geometry, performance, weight, damage tolerarice, maintenance and operating costs. Technical aspects of the design and analysis and the-practical aspects of the manufacture of a composite rotor system are discussed herein. The rotor system was compared to an existing conventional teet

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23

Huh, Youngki 1969. "Highway bridge construction production rates for time estimation." 2004. http://hdl.handle.net/2152/12774.

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24

Saroop, Shian Hemraj. "The infrastructure cost planning model : an integrated solution to cost effective design." Thesis, 2009. http://hdl.handle.net/10321/499.

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Submitted in fulfilment of the academic requirements for the Degree of Magister Technologiae: Civil Engineering, Department of Civil Engineering and Surveying, Faculty of Engineering and the Built Environment, Durban University of Technology, 2009.<br>Infrastructure project costs are being scrutinised more closely and with greater skill and accuracy as projects have become larger, more complex and more expensive, and clients have become more exacting in their requirements. These and other factors compel engineers to design with greater care and in more detail. However, public planners spend v

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