Evaluation of the possibility of helicopter landing and takeoff from ice and marsh surfaces

Аuthors

Orekhov A. ^*, Orekhov K. A.^**, Pavilaynen G. V.^***, Tregulov N. D.^****

St.-Petersburg State University, 7/9, Universitetskaya nab., Saint Petersburg, 199034, Russia

*e-mail: a.orekhov@spbu.ru
**e-mail: orekonan@vk.com
***e-mail: g.pavilaynen@spbu.ru
****e-mail: mailto:4st077176@student.spbu.ru

Abstract

The article considers the problem of hydrostatics during bending of a thick ice plate on an elastic foundation in the case of a concentrated vertical load, simulating the landing and takeoff of helicopters, and calculation of the required ice thickness suitable for landing. In our opinion, helicopter landing and takeoff from ice field are emergencies, until sufficient experiments on location and theoretical studies about ice floe bending are conducted. For helicopter pads studies, ice considers as a floating plate or beam. Тhis problem is similar with the classical Hertz problem on the bending of a thin circular plate with a concentrated vertical load at the center of its upper surface A comparison is made between a phenomenological model on the basis of experimental data constructed and a mathematical model on the finite element method based and implemented in the ANSYS software package. The problem of bending an ice plate solves in two formulations. First, the problem solves for a rigidly fixed plate. Then, the problem solves for a plate on an elastic foundation. The elastic foundation consider as the presence of water under the ice. An influence of water and its reinforcing effect assesses. Mathematical modeling and calculation using the finite element method carries out for two load cases. First, a plate loaded in the center investigates. Then, a study carries out with a load at three points, which corresponds to the actual support of a helicopter on ice. A comparison make between a phenomenological model constructed on experimental data and a mathematical model based on the finite element method and implemented in the ANSYS software package. A qualitative match is of the results obtained.
The work carried at St. Petersburg State University with the support of the grant RFBR_a_2019-3 and with the participation of the Resource Computing Center of St. Petersburg State University.

Keywords:

flexural rigidity, strength, ice

References

1. Ashton G.D. River and Lake Ice Engineering. Littleton, Colorado: Water Resources Publication, 1986. 276 p.
2. Ignatkin Yu.M., Makeev P.V., Shomov A.I. Software for calculation of aerodynamic characteristics of rotors of helicopters on the basis of the nonlinear vortical theory. Trudy MAI. 2010. No. 38. (In Russ.). URL: https://trudymai.ru/eng/published.php?ID=14148
3. Ignatkin Yu.M., Konstantinov S.G. Researches of aerodynamic characteristics of a main rotor helicopter using CFD method. Trudy MAI. 2012. No. 57. (In Russ.). URL: https://trudymai.ru/eng/published.php?ID=30875
4. Zhelonkin A.A. The construction and investigation of the MSC.ADAMS dynamic model of the helicopter. Trudy MAI. 2011. No. 65. (In Russ.). URL: https://trudymai.ru/eng/published.php?ID=35856
5. Kruchinin M.M., Kuz'min D.A. Helicopter chassis drop tests mathematical modeling. Trudy MAI. 2017. No. 92. (In Russ.). URL: https://trudymai.ru/eng/published.php?ID=77093
6. Apollonov D.V., Bibikova K.I., Gavrilova A.V., Shibaev V.M. Issues of choosing the architecture of the automatic control system of a convertible unmanned aerial vehicle – a tiltrotor Trudy MAI. 2021. No. 120. (In Russ.). URL: https://trudymai.ru/eng/published.php?ID=161430
7. Timoshenko S., Woinowsky-Krieger S. Theory of plates and shells, McGraf-Hill Book Company. INC, New-York, Toronto, London, 1959. 636 p.
8. Gol'dshtein R.V., Osipenko N.M. Mechanics of Ice Fracture and Some of Its Applications. Vestnik Novosibirskogo gosudarstvennogo universiteta. Seriya: matematika, mekhanika, informatika. 2012. V. 12, No. 4. P. 41–47. (In Russ.)
9. Sazonov K.E., Luk'yanov S.V., Vladimirova O.M. Osnovy fiziki morskogo l'da (Fundamentals of the Physics of Sea Ice). Saint Petersburg: RGGMU Publ., 2023. 148 p.
10. ISO/FDIS 19906:2010(E). Withdrawal of International Standard. Petroleum and natural gas industries - Arctic offshore structures. Final draft. URL: https://www.iso.org/standard/33690.html
11. Li Lyan, Shkhinek K.N. Ultimate bearing capacity of ice beams. Inzhenerno-stroitel'nyi zhurnal. 2013. No. 1. P. 65-74. (In Russ.). DOI: 10.5862/MCE.36.8
12. Afanas'ev V.P. Determination of ice strength in the calculation of hydraulic structures. Gidrotekhnicheskoe stroitel'stvo. 1968. No. 5. P. 48-51. (In Russ.)
13. Kovalev S.M., Pavilaynen G.V. Mathematical models of local ice strength and problems elastic-plastic bending of hydraulic structures supports. In book: Advances in Solid and Fracture Mechanics. Cham: A Liber Amicorum to Celebrate the Birthday of Nikita Morozov, 2022. С. 135-150.
14. Shkhinek K.N. Ice loads on arctic platforms. Gidrotekhnicheskoe stroitel'stvo. 1994. No. 3. P. 33-36. (In Russ.)
15. Butyagin I.P. Prochnost' l'da i ledyanogo pokrova (Strength of ice and ice cover). Novosibirsk: Nauka Publ., 1966. 153 p.
16. Bogorodskii V.V., Gavrilo V.P. Led. Fizicheskie svoistva. Sovremennye metody glyatsiologii (Ice. Physical Properties. Modern Methods of Glaciology). Leningrad: Gidrometeoizdat Publ., 1980. 384 p.
17. Sodhi D.S. Vertical penetration of floating ice sheets. International Journal of Solid and Structures. 1998. V. 35, No. 32-32. P. 4275-4294. DOI: 10.1016/s0020-7683(97)00316-8
18. Kovalev S.M., Orekhov A.V., Pavilainen G.V. Local strength of ice and its use as a basis for helipads during their operation in the regions of the Far North. XXIV Peterburgskie chteniya po problemam prochnosti, Saint-Petersburg, April 2024, SPb.: «VVM» Publ., 2024. P. 77.
19. Pavilaynen G.V., Orekhov A.V. On the numerical solution and graphic concept of results of elastic-plastic SD-materials bend. In Book: Mathematical and Computer Simulation in Mechanics of Solids and Structures. MCM 2017. Book of Abstracts. 2017. P. 161-163.
20. Bashtovaya V.A., Belov V.D., Sadiev A.A., Savchenko D.S. Study of ice strength on central bending. Mezhdunarodnyi nauchno-issledovatel'skii zhurnal. 2022. No. 6-1. (120). P. 6-11. (In Russ.). DOI: 10.23670/IRJ.2022.120.6.002

Download