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 34 for “"Landing Gear"”.
-
Landing gear integration in aircraft conceptual design
The design of the landing gear is one of the more fundamental aspects of aircraft design. The design and integration process encompasses numerous engineering disciplines, e.g., structure, weights, runway design, and economics, and has become extremely sophisticated in the last few decades. Although …
-
Design of main landing gear of jet trainer
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Aeronautical Engineering, 1954.
-
Aeroacoustic control of landing gear noise using perforated fairings
… the application of perforated fairings for landing gear noise control. The sparse knowledge about this new subject has necessitated a more fundamental study involving a basic fairing-strut configuration, followed by wind tunnel tests on a simplified landing gear configuration incorporating …
-
Evaluating Dynamic ‘Landing Gear Unsafe’ Auditory Alerts as a Defense Against Habituation
… methods to reduce pilot habituation to the 'landing gear unsafe' auditory alert were investigated. Ten subjects executed eight non-precision instrument approaches that exposed the subjects to the 'landing gear unsafe' auditory alert for a prolonged period of time. Subjects were exposed to …
-
Passive Viscoelastic Constrained Layer Damping Application for a Small Aircraft Landing Gear System
… of their applicability to a small aircraft landing gear system for improved damping performance. The applied viscoelastic damping treatment to the gear was of a constrained layer type, promoting increased shear deformation over free surface treatments, and therefore enhanced energy …
-
Modeling, Analysis and Testing of a Semi-Active Control System for Landing Gear Applications
… replacing the standard damper oil in an aircraft landing gear and exposing the system to an appropriate magnetic field, the damping coefficients of the system can be changed almost instantaneously to accommodate nearly any situation. This trait allows a real time controller to monitor the system …
-
Aeroacoustic Study of a Model-Scale Landing Gear in a Semi-Anechoic Wind Tunnel
… was conducted on a 26%-scale Boeing 777 main landing gear in the Virginia Tech (VT) Anechoic Stability Wind Tunnel. The VT Anechoic Stability Wind Tunnel allowed noise measurements to be carried out using both a 63-elements microphone phased array and a linear array of 15 microphones. The …
-
Aerodynamic Measurements in a Wind Tunnel on Scale Models of a 777 Main Landing Gear
… models of the Boeing 777 high fidelity isolated landing gear in the 6- by 6-foot Virginia Tech Stability Wind Tunnel (VT-SWT) at a free-stream Mach number of 0.16. Noise control devices (NCD) were developed at Virginia Tech [9] to reduce noise by shielding gear components, reducing wake …
-
Multidisciplinary Design Optimization of Nose Landing Gears with Two Degrees of Freedom Considering Out of Plane Loading and Actuator Performance
… The design of lightweight retractable aircraft landing gear is a sophisticated multidisciplinary problem. It is difficult to finalize the design through manual iterations, especially under the demands of an accelerated product development process. MDO methodology has been previously developed to …
-
Physics-based aeroacoustic modelling of bluff-bodies
… noise was performed with application to landing gear noise production. The landing gear is a primary contributor to airframe noise during approach. Noise is primarily generated from the unsteady pressures resulting from the turbulent flow around various components. The research was …
-
The directional stability and control of an airplane during the landing roll
… as exhibited by aircraft with tricycle landing gear, during the landing roll after touchdown. The approximate equations of motion are solved on an analog computer to describe the motion of an aircraft as it moves along the runway after it has landed. It is shown that during the landing …
-
Response of a nonlinear two-degree-of-freedom system subjected to an impact loading
… the equations of motion of an aircraft fuselage-landing gear configuration during landings is of interest to the designer who must predict the landing loads which an airplane encounters in service. In general such solutions are difficult because of the highly nonlinear characteristics of the …
-
Trim, Control, and Performance Effects in Variable-Complexity High-Speed Civil Transport Design
… was found necessary to simultaneously consider landing gear integration. We include the engine-out and crosswind landing requirements, as well as engine nacelle ground strike for lateral-directional requirements. For longitudinal requirements we include nose-wheel lift-off rotation and approach …
-
Hybrid wing-body aircraft noise and performance assessment
… are investigated. Improvements are made to the landing gear and airfoil self-noise modules, while a diffraction integral method is implemented in a companion thesis to enhance noise shielding estimates. The N2A overall takeoff and landing noise estimate is found to be 5.3 EPNdB higher than the …
-
Signomial programming for aircraft design
… of the vertical tail, horizontal tail, fuselage, landing gear, and wing of a commercial aircraft with a tube-and- wing configuration. These models are then combined together to produce a full aircraft optimization model. Signomial programming's relaxed formulation allows it to handle some of the …
-
Gulfstream Aerospace Aircraft Static Position Utility
… data includes aircraft attitude, nose and main landing gear loads and aircraft ground clearance data.</p> <p>The previous methods used to obtain this data were a family of spreadsheets. The spreadsheet solution has proven to be awkward and inaccessible for providing the required data. Therefore, …
-
LORE Approach for Phased Array Measurements and Noise Control of Landing Gears
A novel concept in noise control devices for landing gears is presented. These devices consist of elastic membranes creating a fairing around the major noise sources. The purpose of these devices is to reduce wake interactions and to hide components from the flow, thus, reducing the noise emission. …
-
A Multi-modal Robot for Ground and Aerial Locomotion
… drive or fly. Each of these wheels contains a gearing and bearing system that decouples the rotation of the wheels from the rotation of the propellers and also houses the system's landing gear. The prototype described in this thesis is capable of driving on flat surfaces as well as vertical …
-
Computational aeroacoustic modelling using hybrid RANS/LES methods with modified acoustic analogies
… in tandem cylinders to understand aircraft landing gear as a primary contributor to airframe noise during approach and landing. Fluctuations in the flow properties induced by turbulence are computed as well as the corresponding propagations. A hybrid IDDES turbulence model is employed, to …
Page 1 of 2