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Author: Amir S. Gohardani Publisher: Nova Science Publishers ISBN: 9781629485881 Category : Airplanes Languages : en Pages : 0
Book Description
Distributed propulsion technology is one of the revolutionary candidates for future aircraft propulsion. In this book, which serves as the very first reference book on distributed propulsion technology, the potential role of distributed propulsion technology in future aviation is investigated. Following a historical journey that revisits distributed propulsion technology in unmanned air vehicles, commercial aircrafts, and military aircrafts, features of this specific technology are highlighted in synergy with an electric aircraft concept and a first-of-its-kind comparison between commercial and military aircrafts employing distributed propulsion arrangements. In light of propulsionairframe integration and complementary technologies, such as boundary layer ingestion, thrust vectoring and circulation control, transpired opportunities and challenges are addressed in addition to a number of identified research directions proposed for future aircrafts. Moreover, a diverse set of distributed propulsion arrangements are considered. These include: small engines, gas-driven multi-fan architectures, turboelectric systems featuring superconductive and non-superconducting electrical machine technology, and electromagnetic fans. This book features contributions by the National Aeronautics and Space Administration (NASA) and the United States Air Force (USAF), and includes the first proposed official definition for distributed propulsion technology in subsonic fixed wing aircrafts.
Author: Amir S. Gohardani Publisher: Nova Science Publishers ISBN: 9781629485881 Category : Airplanes Languages : en Pages : 0
Book Description
Distributed propulsion technology is one of the revolutionary candidates for future aircraft propulsion. In this book, which serves as the very first reference book on distributed propulsion technology, the potential role of distributed propulsion technology in future aviation is investigated. Following a historical journey that revisits distributed propulsion technology in unmanned air vehicles, commercial aircrafts, and military aircrafts, features of this specific technology are highlighted in synergy with an electric aircraft concept and a first-of-its-kind comparison between commercial and military aircrafts employing distributed propulsion arrangements. In light of propulsionairframe integration and complementary technologies, such as boundary layer ingestion, thrust vectoring and circulation control, transpired opportunities and challenges are addressed in addition to a number of identified research directions proposed for future aircrafts. Moreover, a diverse set of distributed propulsion arrangements are considered. These include: small engines, gas-driven multi-fan architectures, turboelectric systems featuring superconductive and non-superconducting electrical machine technology, and electromagnetic fans. This book features contributions by the National Aeronautics and Space Administration (NASA) and the United States Air Force (USAF), and includes the first proposed official definition for distributed propulsion technology in subsonic fixed wing aircrafts.
Author: National Academies of Sciences, Engineering, and Medicine Publisher: National Academies Press ISBN: 0309440998 Category : Technology & Engineering Languages : en Pages : 123
Book Description
The primary human activities that release carbon dioxide (CO2) into the atmosphere are the combustion of fossil fuels (coal, natural gas, and oil) to generate electricity, the provision of energy for transportation, and as a consequence of some industrial processes. Although aviation CO2 emissions only make up approximately 2.0 to 2.5 percent of total global annual CO2 emissions, research to reduce CO2 emissions is urgent because (1) such reductions may be legislated even as commercial air travel grows, (2) because it takes new technology a long time to propagate into and through the aviation fleet, and (3) because of the ongoing impact of global CO2 emissions. Commercial Aircraft Propulsion and Energy Systems Research develops a national research agenda for reducing CO2 emissions from commercial aviation. This report focuses on propulsion and energy technologies for reducing carbon emissions from large, commercial aircraftâ€" single-aisle and twin-aisle aircraft that carry 100 or more passengersâ€"because such aircraft account for more than 90 percent of global emissions from commercial aircraft. Moreover, while smaller aircraft also emit CO2, they make only a minor contribution to global emissions, and many technologies that reduce CO2 emissions for large aircraft also apply to smaller aircraft. As commercial aviation continues to grow in terms of revenue-passenger miles and cargo ton miles, CO2 emissions are expected to increase. To reduce the contribution of aviation to climate change, it is essential to improve the effectiveness of ongoing efforts to reduce emissions and initiate research into new approaches.
Author: Joaquim Neto Dias Publisher: American Institute of Aeronautics and Astronautics Incorporated ISBN: 9781624105999 Category : Airplanes Languages : en Pages : 0
Book Description
Presents a novel approach to tackle the gust alleviation problem. The authors address the spanwise behaviour of aerodynamic loads, as this is what should be primarily controlled. Because the gust loads are mainly caused by disturbances in the spanwise lift, the aim is at controlling the shape of the lift distribution profile along the span.
Author: Peng Peng Publisher: ISBN: Category : Electric machines Languages : en Pages : 200
Book Description
Driven by the demand to reduce fuel consumption, operating cost and noise of civil aircraft, tremendous effects have been taken towards the more-electric aircraft (MEA) over the past few decades. The substantial difference between an MEA and a traditional aircraft is a higher ratio of electrical power to the total power. Two symbolic shifts differentiate an MEA from a traditional aircraft. The first is the elimination of the integrated drive generator (IDG) which mechanically converts variable jet engine speed to constant speed to generate voltage with constant amplitude and frequency. The main generator in a modern MEA is mechanically coupled with the turbine and generates high power with variable frequency. The second is the much less reliance on the pneumatic and hydraulic power. Loads originally powered by pneumatic and hydraulic power systems are now partially powered by electrical energy in a modern MEA. Both changes contribute to a fuel-efficient and light-weight MEA. The goal of flying an all-electric aircraft has spurred various designs of aircraft propulsion systems based on electrical power, among which the turboelectric distributed propulsion (TeDP) is considered as a good candidate with flexibility and reliability. In addition, there is growing consensus that electric machines and power electronics with high power density and excellent fault-tolerance capability are the key components in aircraft electric propulsion systems. More strict requirements are imposed on the large electric machines than on their counterparts in industrial or automotive applications. Any improvement in weight, size, power and reliability of electric machines is valued for aviation applications. Different from traditional electric machines, brushless doubly-fed machines (BDFM) have two sets of windings with different frequencies and pole pair numbers. It allows more freedom for speed and power control. A brushless doubly-fed machine with a reluctance-type rotor inherently provides excellent fault-tolerance capability for wide speed range operation. The usage of a fractionally-rated converter potentially increases the power density and reduce the cost of the entire drive system. These features enable brushless doubly-fed machines attractive candidates for aviation electrical propulsion system. This work proposes a turboelectric distributed propulsion based on brushless doubly-fed machines. The operating principle and electromagnetic analysis of a high-speed BDFM are elaborated. Mathematical modeling method, and as well as the torque and power formulas of a multi-BDFM TeDP are proposed. A vector control algorithm is proposed based on space-vector theory to achieve maximum torque per ampere operation for the TeDP. Simulation, hardware and experimental results of a designed high-speed brushless doubly-fed machine and its drive system are also presented in this work. In summary, a BDFM-based TeDP provides advantages over state-of-the-art aviation electric propulsion in terms of 1) smaller converter in power rating and size, 2) higher fault tolerant capability, 3) greater flexibility in speed and power control.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 456
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Omar D Lopez Mejia Publisher: BoD – Books on Demand ISBN: 9535134639 Category : Science Languages : en Pages : 196
Book Description
Few years ago, the topic of aerial robots was exclusively related to the robotics community, so a great number of books about the dynamics and control of aerial robots and UAVs have been written. As the control technology for UAVs advances, the great interaction that exists between other systems and elements that are as important as control such as aerodynamics, energy efficiency, acoustics, structural integrity, and applications, among others has become evident. Aerial Robots - Aerodynamics, Control, and Applications is an attempt to bring some of these topics related to UAVs together in just one book and to look at a selection of the most relevant problems of UAVs in a broader engineering perspective.
Author: Mark Ahlers Publisher: SAE International ISBN: 0768082978 Category : Technology & Engineering Languages : en Pages : 107
Book Description
Aircraft thermal management (ATM) is increasingly important to the design and operation of commercial and military aircraft due to rising heat loads from expanded electronic functionality, electric systems architectures, and the greater temperature sensitivity of composite materials compared to metallic structures. It also impacts engine fuel consumption associated with removing waste heat from an aircraft. More recently the advent of more electric architectures on aircraft, such as the Boeing 787, has led to increased interest in the development of more efficient ATM architectures by the commercial airplane manufacturers. The ten papers contained in this book describe aircraft thermal management system architectures designed to minimize airplane performance impacts which could be applied to commercial or military aircraft. Additional information on Aircraft Thermal Management System Architectures is available from SAE AIR 5744 issued by the AC-9 Aircraft Environmental System Committee and the SAE book Aircraft Thermal Management Integrated Analysis (PT-178). SAE AIR 5744 defines the discipline of aircraft thermal management system engineering while Aircraft Thermal Management Integrated Analysis discusses approaches to computer simulation of the simultaneous operation of all systems affecting thermal management on an aircraft.
Author: Amir S. Gohardani
Author: Amir S. Gohardani
Author: National Academies of Sciences, Engineering, and Medicine
Author: Joaquim Neto Dias
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Author: Peng Peng
Author: 
Author: Omar D Lopez Mejia
Author: 
Author: 
Author: Mark Ahlers