Effect of Step Depth and Angle on the Aerodynamics of a Sliding Morphing Skin
Fadi Mishriky,
Paul Walsh
Issue:
Volume 3, Issue 3, December 2016
Pages:
24-30
Received:
19 September 2016
Accepted:
27 September 2016
Published:
18 October 2016
Abstract: The past two decades have witnessed a growing interest among aerospace researchers and designers in aircraft morphing technology. A single aircraft with morphing wings can perform near optimum at different flight regimes by changing the geometry of its wings. With the advancements achieved in this field, a need for a reliable morphing skin is emerging. The demanding task of designing a morphing skin has to compromise between flexibility to ensure low actuation requirements, and high stiffness to carry all the aerodynamic loads. One of the viable designs that fulfills the mechanical requirements is the segmented sliding skin. In such a design, discrete panels overlap to cover the surface of the wing and slide against each other during the morphing motion. From the aerodynamic perspective, the sliding panels introduce backward-facing steps on airfoil surface. In the process of determining the optimum panels’ thickness, this paper presents a comprehensive numerical study on the effect of the step depth and angle on the aerodynamics of an airfoil with a backward-facing step employed on its lower surface. Results showed a significant improvement in the lifting capabilities of the stepped airfoil, and this improvement is directly proportional to the step depth. On the other hand, the separated flow at the step edge induced a low pressure recirculation zone that created a suction force directly proportional to the effective area of the backward-facing step. This resulted in a drag coefficient value that is directly proportional to the step depth. The aerodynamic efficiency of the stepped airfoil was degraded in terms of the lift-to-drag ratio, however decreasing the step depth largely mitigated these adverse effects. Studying different step angles showed that the step can be tilted over a wide range of angles with a negligible effect on the aerodynamics of the stepped airfoil.
Abstract: The past two decades have witnessed a growing interest among aerospace researchers and designers in aircraft morphing technology. A single aircraft with morphing wings can perform near optimum at different flight regimes by changing the geometry of its wings. With the advancements achieved in this field, a need for a reliable morphing skin is emerg...
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Application Analysis of Swietenia Mahagoni (Mahogany) Seed’s Unique Aerodynamical Landing Characteristics
Issue:
Volume 3, Issue 3, December 2016
Pages:
31-35
Received:
30 October 2016
Accepted:
14 November 2016
Published:
25 November 2016
Abstract: A model of safe landing capsule and ICBM multi war head transportation system for cluster type bomb attack by analysis of seed landing trajectory. Swietenia mahagoni (mahogany) seed has the uniqueness on its falling characteristics. At the time of falling, mahogany seed rotates in the axis center which is similar to the gyration of propeller towards its pivot point. The seeds look and behave like helicopter rotors. The gyration slows down the landing time whereby it is furthering the landing distance of the mahogany seeds. In this paper focused on this characteristic of the mahogany seed for real world application analysis and also the whole seed model application analysis also including some tests on the seeds.
Abstract: A model of safe landing capsule and ICBM multi war head transportation system for cluster type bomb attack by analysis of seed landing trajectory. Swietenia mahagoni (mahogany) seed has the uniqueness on its falling characteristics. At the time of falling, mahogany seed rotates in the axis center which is similar to the gyration of propeller toward...
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Haptic Feedback Experiments for Improved Teleoperation of a Robotic Arm
Monica Dascalu,
Lucian Milea,
Eduard Franti,
Florin Lazo,
Elteto Zoltan,
Ioan Ispas
Issue:
Volume 3, Issue 3, December 2016
Pages:
36-42
Received:
31 October 2016
Accepted:
9 November 2016
Published:
5 December 2016
Abstract: The paper presents a robotic arm which is operated by means of a sensorial interface mounted on the hand and arm of the human operator. The novelty of the research is the application of devices similar to those used for movements detection in virtual reality applications in order to command a robotic system. Depending on the precision of the application intended and also depending on the number of degrees of freedom, the motion detection for the human hand and arm’s motions was approached on different levels of complexity. The data processing methods and the action commands methods were developed in correlation with the structure of the robotic arm and starting from the monitor of the movements of the human arm and hand. The sensorial interface was conceived on the premises that the robotic arm should be able to realize movements similar to those of a healthy human hand, as requested by the application. Therefore, the sensorial interface that monitors the movement of the hand was implemented in order to command a robotic arm having 5 degree of freedom, having an anthropomorphic robotic hand at its end The joints of the system allow rotations of 30-180 degrees (depending on the utility and position). The experimental testing of the robotic system verified the performances of the robotic arm to replicate the movements of the human hand. The operator executed a sequence of movements, with the sensorial interface on, and the robotic arm reproduced the movements (the response was analyzed in quality and quantity).
Abstract: The paper presents a robotic arm which is operated by means of a sensorial interface mounted on the hand and arm of the human operator. The novelty of the research is the application of devices similar to those used for movements detection in virtual reality applications in order to command a robotic system. Depending on the precision of the applic...
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Electrodynamic Launch System Takeoff-Elevating Platforms for Deck-Based Aircraft Carriers Concept Development and Design
Volodymyr Chumakov,
Oleksandr Stolarchuk
Issue:
Volume 3, Issue 3, December 2016
Pages:
43-49
Received:
3 December 2016
Accepted:
22 December 2016
Published:
7 January 2017
Abstract: The results of the development of the deck-based takeoff-elevating platforms of electrodynamic launch system are given. The research results of electrodynamic railguns with pulsed-dynamic biasing of acceleration channel and their modifications are used as the basis for the development and design. Comparative characteristics of the developed systems EMALS criteria are shown.
Abstract: The results of the development of the deck-based takeoff-elevating platforms of electrodynamic launch system are given. The research results of electrodynamic railguns with pulsed-dynamic biasing of acceleration channel and their modifications are used as the basis for the development and design. Comparative characteristics of the developed systems...
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