Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 21 for “"Blended-Wing-Body"”.
-
Multidisciplinary methods for performing trade studies on blended wing body aircraft
… with a focus on the conceptual design of Blended Wing Body (BWB) aircraft. The objectives of this thesis are twofold. The first objective is to create a multidisciplinary tool for the design of BWB aircraft and to demonstrate the performance of the tool on several example trade studies. …
-
Vibration control and gust alleviation of highly flexible blended-wing-body aircraft
… large deformations in the flexible, lightweight wings. These disturbances can potentially excite unstable modes within the flexible aircraft, depending on the flight speed and gust strength. In this thesis the open-loop and closed-loop dynamic responses of a blended-wing-body aircraft subjected …
-
Guidance, navigation and control of a small, unmanned blended wing body aircraft
… consisted of both path planning and path following algorithms which allowed for the synthesis of general classes of paths useful to the application. With both the autopilot and guidance laws developed, the system could be tested under several atmospheric flight conditions. These took the form …
-
The Multidisciplinary Design Optimization of a Distributed Propulsion Blended-Wing-Body Aircraft
… optimization (MDO) of a distributed propulsion blended-wing-body (BWB) aircraft. The BWB is a hybrid shape resembling a flying wing, placing the payload in the inboard sections of the wing. The distributed propulsion concept involves replacing a small number of large engines with many smaller …
-
Engine design implications for a blended wing-body aircraft with boundary later ingestion
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
-
Numerical Assessment of the Performance of Jet-Wing Distributed Propulsion on Blended-Wing-Body Aircraft
… the thrust across most, or all, of the wingspan of an aircraft. This can be accomplished by using several large engines and using a duct to spread out the exhaust flow to form a jet-wing or by using many small engines spaced along the span of the wing. Jet-wing distributed propulsion was …
-
L1 adaptive control augmentation system for the X-48B Aircraft
… control methodology to a model of the X-48B Blended Wing Body aircraft. We explicitly verify the performance bounds of the adaptive flight control system at various flight conditions. We demonstrate that the resulting L1 adaptive controller does not require tuning or redesign from one flight …
-
Methods for designing the next generation of aircraft architectures using topology optimisation
… efficient transportation has resulted in a growing interest in new aircraft configurations such as the Blended Wing Body. There is very little collective knowledge on the optimal structural layouts of these aircraft, and the paradigms applied to conventional aircraft may not be applicable. …
-
Multi-fidelity data fusion for the design of multidisciplinary systems under uncertainty
… on the stability and control analysis of a Blended-Wing-Body aircraft's center of gravity limits. The results show that low-fidelity data is enhanced by the presence of high-fidelity data in key areas of the design space. At the same time, the presence of even sparse high-fidelity data is …
-
Assessment of an Innovative Experimental Facility for Testing Diffusing Serpentine Inlets with Large Amounts of Boundary Layer Ingestion
… diffusing serpentine inlets intended for use on blended-wing-body aircraft. The static ground test facility was able to simulate the boundary layer profile expected to be ingested by inlets mounted on the aft sections of these aircraft. It generated Mach numbers ranging from 0.19 to 0.4 and …
-
Value-based multidisciplinary optimization for commercial aircraft program design
… are applied to a design example for the Blended-Wing-Body aircraft concept. Value-based optimization yields a design with a 2.3%-higher program value than that of the conventional minimum-weight solution.
-
Multidisciplinary optimization of aircraft design and takeoff operations for low noise
… aircraft design model was developed to generate blended-wing-body-type designs using simple-physics models and empirical scaling from a reference design. This model generates a scaled airframe and engine, an estimate of aircraft weights and center of gravity, a takeoff trajectory, outer wing …
-
A life-cycle flexibility framework for designing, evaluating and managing "complex" real options : case studies in urban transportation and aircraft systems
… options and test the LCF Framework: 1) a large blended wing body aircraft in a commercial aircraft manufacturing enterprise and, 2) Intelligent Transportation System (ITS) capabilities in an urban region with multiple public and private stakeholders. For the case studies, both a quantitative and …
-
Propulsion system concepts for silent aircraft
… embed such ultra-high bypass ratio engines in a blended-wing-body airframe, a distributed propulsion system consisting of 10 core engines driving a total number of 30 fans via gearboxes and shafts is suggested.
-
Computational Zoning Assessment of Unconventional Aircraft
… analysis of the optimal aircraft charge, allowing the aircraft to sustain higher fields, is presented. The details of the software, which uses an implementation of the three dimensional Galerkin finite element method, is covered. Analysis examples of the MIT D8 DoubleBubble, a Blended Wing …
-
Valuation techniques for commercial aircraft program design
… value. Several examples are drawn from the Blended-Wing-Body aircraft concept to demonstrate the operation of the program valuation tool. The results suggest that the value of part commonality between aircraft may be strongly sensitive to the weight penalty and increased fuel burn resulting …
-
Active Flow Control of a Boundary Layer Ingesting Serpentine Diffuser
… a significant benefit to the performance of Blended Wing Body aircraft. However, the inherent diffuser geometry combined with a thick ingested boundary layer creates strong secondary flows that lead to severe flow distortion at the engine face, increasing the possibility of engine surge. This …
-
Experimental Investigation of Fan Rotor Response to Inlet Swirl Distortion
… fluid dynamics models of a conceptual blended wing body aircraft at a plane upstream of the fan. The swirl distortion was then free to develop naturally within the inlet duct before being ingested by the engine. Results from the investigation revealed that the generated swirl profile …
-
Simulating airline operational responses to environmental constraints
… of radically new technology such as a blended wing body aircraft or advanced open rotor engines. The simulation results indicate that, while airport capacity constraints may have significant system-wide effects, they are the result of local airport effects which are much greater. In …
-
Trim Angle of Attack of Flexible Wings Using Non-Linear Aerodynamics
… the design of future high-performance aircraft (Blended-Wing Body, Truss-Braced wing, High Speed Civil transport, High-Altitude Long Endurance aircraft and future military aircraft). Also, the availability of supercomputers has made it now possible to employ high-fidelity models (Computational …
Page 1 of 2