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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Advances in aircraft and spacecraft science
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Volume 1, Issue 4 - Oct 2014
Volume 1, Issue 3 - Jul 2014
Volume 1, Issue 2 - Apr 2014
Volume 1, Issue 1 - Jan 2014
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Investigation on nanoadhesive bonding of plasma modified titanium for aerospace application
Ahmed, Sabbir ; Chakrabarty, Debabrata ; Mukherjee, Subroto ; Joseph, Alphonsa ; Jhala, Ghanshyam ; Bhowmik, Shantanu ;
Advances in aircraft and spacecraft science, volume 1, issue 1, 2014, Pages 1~14
DOI : 10.12989/aas.2014.1.1.001
Physico-chemical changes of the plasma modified titanium alloy [Ti-6Al-4V] surface were studied with respect to their crystallographic changes by X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM).The plasma-treatment of surface was carried out to enhance adhesion of high performance nano reinforced epoxy adhesive, a phenomenon that was manifested in subsequent experimental results. The enhancement of adhesion as a consequence of improved spreading and wetting on metal surface was studied by contact angle (sessile drop method) and surface energy determination, which shows a distinct increase in polar component of surface energy. The synergism in bond strength was established by analyzing the lap-shear strength of titanium laminate. The extent of enhancement in thermal stability of the dispersed nanosilica particles reinforced epoxy adhesive was studied by Thermo Gravimetric Analysis (TGA), which shows an increase in onset of degradation and high amount of residuals at the high temperature range under study. The fractured surfaces of the joint were examined by Scanning electron microscope (SEM).
Energy-efficient flow control around blunt bodies
Yurchenko, Nina F. ;
Advances in aircraft and spacecraft science, volume 1, issue 1, 2014, Pages 15~25
DOI : 10.12989/aas.2014.1.1.015
The developed concept of smart flow control based on turbulence scale modification was applied to control a flow around a circular cylinder. The concept was realized using arrays of vortex-generators regularly spaced along a cylinder generatrix with a given step. Mechanical and thermal vortex-generators were tested, the latter having been based on the localized surface heating or plasma discharges initiated with microwave radiation near the surface. Thus depending on a particular engineering solution, flow transport properties could be modified in passive or active ways. Matched numerical and experimental investigations showed a possibility to delay flow separation and, accordingly, to improve the aerodynamic performance of blunt bodies.
Circular cylinder drag reduction using piezoelectric actuators
Orazi, Matteo ; Lasagna, Davide ; Iuso, Gaetano ;
Advances in aircraft and spacecraft science, volume 1, issue 1, 2014, Pages 27~41
DOI : 10.12989/aas.2014.1.1.027
An active flow control technique based on "smart-tabs" is proposed to delay flow separation on a circular cylinder. The actuators are retractable and orientable multilayer piezoelectric tabs which protrude perpendicularly from the model surface. They are mounted along the spanwise direction with constant spacing. The effectiveness of the control was tested in pre-critical and in post-critical regime by evaluating the effects of several control parameters of the tabs like frequency, amplitude, height, angular position and plate incidence with respect to the local flow. Measurements of the mean static pressure distribution around the cylinder were used to estimate the pressure drag coefficient. The maximum drag reduction achieved in the pre-critical regime was of the order of 30%, whereas in the post-critical regime was about 10%, 3% of which due to active forcing. Furthermore, pressure fluctuation measurements were performed and spectral analysis indicated an almost complete suppression of the vortex shedding in active forcing conditions.
Adaptable conceptual aircraft design model
Fioriti, Marco ;
Advances in aircraft and spacecraft science, volume 1, issue 1, 2014, Pages 43~67
DOI : 10.12989/aas.2014.1.1.043
This paper presents a new conceptual design model ACAD (Adaptable Conceptual Aircraft Design), which differs from the other models due to its considerable adaptability to the different classes of aircraft. Another significant feature is the simplicity of the process which leads to the preliminary design outputs and also allowing a substantial autonomy in design choices. The model performs the aircraft design in terms of total weight, weight of aircraft subsystems, airplane and engine performances, and basic aircraft configuration layout. Optimization processes were implemented to calculate the wing aspect ratio and to perform the design requirements fulfillment. In order to evaluate the model outcomes, different test cases are presented: a STOL ultralight airplane, a new commuter with open-rotor engines and a last generation fighter.
An active back-flow flap for a helicopter rotor blade
Opitz, Steffen ; Kaufmann, Kurt ; Gardner, Anthony ;
Advances in aircraft and spacecraft science, volume 1, issue 1, 2014, Pages 69~91
DOI : 10.12989/aas.2014.1.1.069
Numerical investigations are presented, which show that a back-flow flap can improve the dynamic stall characteristics of oscillating airfoils. The flap was able to weaken the stall vortex and therefore to reduce the peak in the pitching moment. This paper gives a brief insight into the method of function of a back-flow flap. Initial wind tunnel experiments were performed to define the structural requirements for a detailed experimental wind tunnel characterization. A structural integration concept and two different actuation mechanisms of a back-flow flap for a helicopter rotor blade are presented. First a piezoelectric actuation system was investigated, but the analytical model to estimate the performance showed that the displacement generated is too low to enable reliable operation. The seond actuation mechanism is based on magnetic forces to generate an impulse that initiates the opening of the flap. A concept based on two permanent magnets is further detailed and characterized, and this mechanism is shown to generate sufficient impulse for reliable operation in the wind tunnel.
A variational asymptotic approach for thermoelastic analysis of composite beams
Wang, Qi ; Yu, Wenbin ;
Advances in aircraft and spacecraft science, volume 1, issue 1, 2014, Pages 93~123
DOI : 10.12989/aas.2014.1.1.093
A variational asymptotic composite beam model has been developed for thermoelastic analysis. Composite beams, including sandwich structure and laminates, under different boundary conditions are examined. Previously developed beam model, which is based on variational-asymptotic method, is extended to incorporate temperature-dependent materials experiencing large temperature changes. The recovery relations have been derived so that the temperatures, heat fluxes, stresses, and strains can be recovered over the cross-section. The present theory is implemented into the computer program VABS (Variational Asymptotic Beam Sectional analysis). Numerical results are compared with the 3D analysis for the purpose of demonstrating advantages of the present theory and use of VABS.