Analysis of the Aerodynamically Deployable Wings and Payload Support Structure of the Mono Tiltrotor

Abstract :-
The Mono Tiltrotor (MTR) is a new VTOL concept, proposed to meet heavy lift rotorcraft requirements. The premise of the MTR is a tilting coaxial rotor system for lifting and propulsion, along with aerodynamically deployable fixed-wings for long-range cruise. The symmetric and controlled self-deployment of these wings is a critical design feature of the MTR concept. To this end, a mathematical model was developed to predict the optimal wing hinge geometry to obtain satisfactory wing deployment. Continue reading Analysis of the Aerodynamically Deployable Wings and Payload Support Structure of the Mono Tiltrotor

Analysis of Scye Bearing Motion as Applicable to the Design of a Morphing Spacesuit

Analysis Of Scye Bearing Motion As Applicable To The Design Of A Morphing Spacesuit

Abstract :- This thesis describes research supporting the development of the Morphing Upper Torso spacesuit design, which uses robotic augmentation of a rear-entry pressure suit to adjust torso dimensions. This concept has the potential to provide increased mobility, easier ingress/egress of the suit, and reduced astronaut workload during extravehicular operations. Continue reading Analysis of Scye Bearing Motion as Applicable to the Design of a Morphing Spacesuit

Analysis of Rotor Wake Aerodynamics During Maneuvering Flight Using a Free-Vortex Wake Methodology

Analysis of Rotor Wake Aerodynamics During Maneuvering Flight Using a Free-Vortex Wake Methodology

Abstract :- The problem of helicopter rotor wake aerodynamics during maneuvering flight conditions was analyzed using a time-accurate, free-vortex wake methodology. The free-vortex method consists of a Lagrangian representation of the rotor flow field using vortex elements, where the evolution of the flow field is simulated by tracking the free motion of these vortex elements and calculating their induced velocity field. Traditionally, free-vortex methods are inviscid, incompressible models, but in the present approach the viscous effects are incorporated using a viscous splitting method where the viscous and inviscid terms are modeled as successive sub-processes. The rotor aerodynamics and rigid blade flapping dynamics are closely coupled with the wake model and solved for in a consistent manner using the same numerical scheme. Continue reading Analysis of Rotor Wake Aerodynamics During Maneuvering Flight Using a Free-Vortex Wake Methodology

Analysis of Grasp Requirements for Telerobotic Satellite Servicing

Analysis of Grasp Requirements for Telerobotic Satellite Servicing

Abstract :-
here is an established need to service satellites while on-orbit. Teleoperated robots may conduct this servicing, if the grasps required to perform these tasks are identified and understood. By studying Hubble Space Telescope Servicing Mission 3B, the human grasps used for servicing satellites are identified. Based on the human grasps, a robotic grasp taxonomy is developed. The grasps required for robotic satellite servicing are described in this study in terms of end-effector requirements. Continue reading Analysis of Grasp Requirements for Telerobotic Satellite Servicing

Aerothermodynamic Optimization of Earth Entry Blunt Body Heat Shields for Lunar and Mars Return

Aerothermodynamic Optimization of Earth Entry Blunt Body Heat Shields for Lunar and Mars Return

Abstract :-
A differential evolutionary algorithm has been executed to optimize the hypersonic aerodynamic and stagnation-point heat transfer performance of Earth entry heat shields for Lunar and Mars return manned missions with entry velocities of 11 and 12.5 km/s respectively. The aerothermodynamic performance of heat shield geometries with lift-to-drag ratios up to 1.0 is studied. Each considered heat shield geometry is composed of an axial profile tailored to fit a base cross section. Continue reading Aerothermodynamic Optimization of Earth Entry Blunt Body Heat Shields for Lunar and Mars Return

Adaptive Superposition of Finite Element Meshes in Linear and Nonlinear Dynamic Analysis

Adaptive Superposition of Finite Element Meshes in Linear and Nonlinear Dynamic Analysis

Abstract :-
The numerical analysis of transient phenomena in solids, for instance, wave propagation and structural dynamics, is a very important and active area of study in engineering. Despite the current evolutionary state of modern computer hardware, practical analysis of large scale, nonlinear transient problems requires the use of adaptive methods where computational resources are locally allocated according to the interpolation requirements of the solution form. Adaptive analysis of transient problems involves obtaining solutions at many different time steps, each of which requires a sequence of adaptive meshes. Therefore, the execution speed of the adaptive algorithm is of paramount importance. Continue reading Adaptive Superposition of Finite Element Meshes in Linear and Nonlinear Dynamic Analysis