Analysis of the Sailplane Final Approaches Performed by Cosine-Law Speed Variations

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Izvoz citacije: ABNT
STEFANOVIĆ, Zoran ;KOSTIĆ, Ivan .
Analysis of the Sailplane Final Approaches Performed by Cosine-Law Speed Variations. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 56, n.7-8, p. 436-446, october 2017. 
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/sl/article/analysis-of-the-sailplane-final-approaches-performed-by-cosine-law-speed-variations/>. Date accessed: 21 feb. 2020. 
doi:http://dx.doi.org/.
Stefanović, Z., & Kostić, I.
(2010).
Analysis of the Sailplane Final Approaches Performed by Cosine-Law Speed Variations.
Strojniški vestnik - Journal of Mechanical Engineering, 56(7-8), 436-446.
doi:http://dx.doi.org/
@article{.,
	author = {Zoran  Stefanović and Ivan  Kostić},
	title = {Analysis of the Sailplane Final Approaches Performed by Cosine-Law Speed Variations},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {56},
	number = {7-8},
	year = {2010},
	keywords = {sailplane; final approach; inoperable spoilers; cosine speed variations; },
	abstract = {High lift-to-drag ratios of the contemporary sailplanes make them the most energy efficient flying vehicles. On the other hand, this capability may become their serious disadvantage during the landing, if their aerodynamic deceleration devices become inoperable in flight. Not being able to dissipate the excess energy quickly when close to the ground, they may fly over the available landing ground and finish up in front of the obstacles, with still too much energy to land and not enough to fly over them. Beside the sideslipping flight in final, where energy is dissipated through the increased sideforce drag, another solution to this problem has been offered in a number of papers. By numerical analyses they have shown that landing distance in such cases could be minimized using rather complex oscillating flight paths in vertical plane. Although relevant distance reductions could be achieved through them, performing such paths in practice would require exceptional piloting skills. Instead of that, in this paper much simpler approach profiles have been analyzed, based on two types of cosine speed variations with constant periods and amplitudes, which could be flown by pilots of average flying experience. After establishing a quick convergence algorithm, numerical solutions for several typical cases, belonging to two general speed variation types, have been presented. The same initial and terminal reference energy states have been used. Although the distance reductions are smaller than obtained by distance-minimizing techniques, operational simplicity of presented techniques and some specific advantages prove them valuable within this category of problems.},
	issn = {0039-2480},	pages = {436-446},	doi = {},
	url = {https://www.sv-jme.eu/sl/article/analysis-of-the-sailplane-final-approaches-performed-by-cosine-law-speed-variations/}
}
Stefanović, Z.,Kostić, I.
2010 October 56. Analysis of the Sailplane Final Approaches Performed by Cosine-Law Speed Variations. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 56:7-8
%A Stefanović, Zoran 
%A Kostić, Ivan 
%D 2010
%T Analysis of the Sailplane Final Approaches Performed by Cosine-Law Speed Variations
%B 2010
%9 sailplane; final approach; inoperable spoilers; cosine speed variations; 
%! Analysis of the Sailplane Final Approaches Performed by Cosine-Law Speed Variations
%K sailplane; final approach; inoperable spoilers; cosine speed variations; 
%X High lift-to-drag ratios of the contemporary sailplanes make them the most energy efficient flying vehicles. On the other hand, this capability may become their serious disadvantage during the landing, if their aerodynamic deceleration devices become inoperable in flight. Not being able to dissipate the excess energy quickly when close to the ground, they may fly over the available landing ground and finish up in front of the obstacles, with still too much energy to land and not enough to fly over them. Beside the sideslipping flight in final, where energy is dissipated through the increased sideforce drag, another solution to this problem has been offered in a number of papers. By numerical analyses they have shown that landing distance in such cases could be minimized using rather complex oscillating flight paths in vertical plane. Although relevant distance reductions could be achieved through them, performing such paths in practice would require exceptional piloting skills. Instead of that, in this paper much simpler approach profiles have been analyzed, based on two types of cosine speed variations with constant periods and amplitudes, which could be flown by pilots of average flying experience. After establishing a quick convergence algorithm, numerical solutions for several typical cases, belonging to two general speed variation types, have been presented. The same initial and terminal reference energy states have been used. Although the distance reductions are smaller than obtained by distance-minimizing techniques, operational simplicity of presented techniques and some specific advantages prove them valuable within this category of problems.
%U https://www.sv-jme.eu/sl/article/analysis-of-the-sailplane-final-approaches-performed-by-cosine-law-speed-variations/
%0 Journal Article
%R 
%& 436
%P 11
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 56
%N 7-8
%@ 0039-2480
%8 2017-10-24
%7 2017-10-24
Stefanović, Zoran, & Ivan  Kostić.
"Analysis of the Sailplane Final Approaches Performed by Cosine-Law Speed Variations." Strojniški vestnik - Journal of Mechanical Engineering [Online], 56.7-8 (2010): 436-446. Web.  21 Feb. 2020
TY  - JOUR
AU  - Stefanović, Zoran 
AU  - Kostić, Ivan 
PY  - 2010
TI  - Analysis of the Sailplane Final Approaches Performed by Cosine-Law Speed Variations
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 
KW  - sailplane; final approach; inoperable spoilers; cosine speed variations; 
N2  - High lift-to-drag ratios of the contemporary sailplanes make them the most energy efficient flying vehicles. On the other hand, this capability may become their serious disadvantage during the landing, if their aerodynamic deceleration devices become inoperable in flight. Not being able to dissipate the excess energy quickly when close to the ground, they may fly over the available landing ground and finish up in front of the obstacles, with still too much energy to land and not enough to fly over them. Beside the sideslipping flight in final, where energy is dissipated through the increased sideforce drag, another solution to this problem has been offered in a number of papers. By numerical analyses they have shown that landing distance in such cases could be minimized using rather complex oscillating flight paths in vertical plane. Although relevant distance reductions could be achieved through them, performing such paths in practice would require exceptional piloting skills. Instead of that, in this paper much simpler approach profiles have been analyzed, based on two types of cosine speed variations with constant periods and amplitudes, which could be flown by pilots of average flying experience. After establishing a quick convergence algorithm, numerical solutions for several typical cases, belonging to two general speed variation types, have been presented. The same initial and terminal reference energy states have been used. Although the distance reductions are smaller than obtained by distance-minimizing techniques, operational simplicity of presented techniques and some specific advantages prove them valuable within this category of problems.
UR  - https://www.sv-jme.eu/sl/article/analysis-of-the-sailplane-final-approaches-performed-by-cosine-law-speed-variations/
@article{{}{.},
	author = {Stefanović, Z., Kostić, I.},
	title = {Analysis of the Sailplane Final Approaches Performed by Cosine-Law Speed Variations},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {56},
	number = {7-8},
	year = {2010},
	doi = {},
	url = {https://www.sv-jme.eu/sl/article/analysis-of-the-sailplane-final-approaches-performed-by-cosine-law-speed-variations/}
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TY  - JOUR
AU  - Stefanović, Zoran 
AU  - Kostić, Ivan 
PY  - 2017/10/24
TI  - Analysis of the Sailplane Final Approaches Performed by Cosine-Law Speed Variations
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 56, No 7-8 (2010): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 
KW  - sailplane, final approach, inoperable spoilers, cosine speed variations, 
N2  - High lift-to-drag ratios of the contemporary sailplanes make them the most energy efficient flying vehicles. On the other hand, this capability may become their serious disadvantage during the landing, if their aerodynamic deceleration devices become inoperable in flight. Not being able to dissipate the excess energy quickly when close to the ground, they may fly over the available landing ground and finish up in front of the obstacles, with still too much energy to land and not enough to fly over them. Beside the sideslipping flight in final, where energy is dissipated through the increased sideforce drag, another solution to this problem has been offered in a number of papers. By numerical analyses they have shown that landing distance in such cases could be minimized using rather complex oscillating flight paths in vertical plane. Although relevant distance reductions could be achieved through them, performing such paths in practice would require exceptional piloting skills. Instead of that, in this paper much simpler approach profiles have been analyzed, based on two types of cosine speed variations with constant periods and amplitudes, which could be flown by pilots of average flying experience. After establishing a quick convergence algorithm, numerical solutions for several typical cases, belonging to two general speed variation types, have been presented. The same initial and terminal reference energy states have been used. Although the distance reductions are smaller than obtained by distance-minimizing techniques, operational simplicity of presented techniques and some specific advantages prove them valuable within this category of problems.
UR  - https://www.sv-jme.eu/sl/article/analysis-of-the-sailplane-final-approaches-performed-by-cosine-law-speed-variations/
Stefanović, Zoran, AND Kostić, Ivan.
"Analysis of the Sailplane Final Approaches Performed by Cosine-Law Speed Variations" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 56 Number 7-8 (24 October 2017)

Avtorji

Inštitucije

  • University of Belgrade, Faculty of Mechanical Engineering, Serbia
  • University of Belgrade, Faculty of Mechanical Engineering, Serbia

Informacije o papirju

Strojniški vestnik - Journal of Mechanical Engineering 56(2010)7-8, 436-446

High lift-to-drag ratios of the contemporary sailplanes make them the most energy efficient flying vehicles. On the other hand, this capability may become their serious disadvantage during the landing, if their aerodynamic deceleration devices become inoperable in flight. Not being able to dissipate the excess energy quickly when close to the ground, they may fly over the available landing ground and finish up in front of the obstacles, with still too much energy to land and not enough to fly over them. Beside the sideslipping flight in final, where energy is dissipated through the increased sideforce drag, another solution to this problem has been offered in a number of papers. By numerical analyses they have shown that landing distance in such cases could be minimized using rather complex oscillating flight paths in vertical plane. Although relevant distance reductions could be achieved through them, performing such paths in practice would require exceptional piloting skills. Instead of that, in this paper much simpler approach profiles have been analyzed, based on two types of cosine speed variations with constant periods and amplitudes, which could be flown by pilots of average flying experience. After establishing a quick convergence algorithm, numerical solutions for several typical cases, belonging to two general speed variation types, have been presented. The same initial and terminal reference energy states have been used. Although the distance reductions are smaller than obtained by distance-minimizing techniques, operational simplicity of presented techniques and some specific advantages prove them valuable within this category of problems.

sailplane; final approach; inoperable spoilers; cosine speed variations;