Modeling of the wind generated force acting on the liferaft

• Autorzy: Smolarek L.
• Języki publikacji: EN

Abstrakty

EN

The aim of this paper is to derive a mathematical model for estimating the wind forces and wind moments effects a life raft. The mathematical model based on data from laboratory experiments. Forces due to the action of wind are adequately described. The governing physical equations, however, contain characteristics of the environment that are often not well quantified. In the strong wind condition, when the wind speed is much larger than the current and body speeds, all wind-generated forces must be taken into account. Friction and pressure forces exerted by the wind on the upper part of the floating body result in the wind force, which has a downwind component (drag) and a crosswind component (side force or lift), [1][2]. The drag component is always positive. The side force or lift component can be positive or negative[8]. The lift depends on the wind speed, body geometry, and strongly on the angle between the long axis of the floating body and the wind direction. In this paper the author presents models of wind forces acting at a life raft. Data from laboratory experiments (wind tunnel [5]) are used to build dynamical models.

Słowa kluczowe

EN

navigation; rescue; wind; mathematical model; aerodynamic

PL

nawigacja; ratownictwo; wiatr; modele matematyczne; aerodynamika

• Wydawca: Polskie Forum Nawigacyjne
• Czasopismo: Annual of Navigation
• Rocznik: 2003
• Tom: No. 6
• Strony: 81--90
• Opis fizyczny: Bibliogr. 8 poz., rys., tab.

Twórcy

autor

Smolarek L.

• Gdynia Maritime University, Faculty of Navigation

Bibliografia

• 1. Blendermann W. – Parameter identification of wind loads on ships Journal of Wind Eng. & Ind. Aerodyn. 51, 1994
• 2. Blendermann W. – Estimation of Wind Loads on Ships in Wind with a strong Gradient OMAE – Vol. 1–A, Offshore Technology ASME, 1995
• 3. Davenport G.– The spectrum of horizontal gustiness near the ground in high winds Quarterly Journal of the Royal Meteorological Society, vol. 87, 1961
• 4. International Aeronautical and Maritime Search and Rescue Manual (IAMSAR Manual), IMO/ICAO, London/Montreal, 1999.
• 5. Raport z badań „Badania aerodynamiczne pneumatycznych tratew ratunkowych w tunelu aerodynamicznym ∅ 5m” – Raport nr 168/BA/2000/D Instytut Lotnictwa Warszawa 2000
• 6. Smolarek L. - An example of non-linear leeway for the life raft, Proc. International Congress of Seas and Oceans, Szczecin-Miedzyzdroje 2001,Vol.1
• 7. Smolarek L. (2001). Przerwanie liniowości ruchu obiektów poszukiwanych-tratwy ratunkowe, 2001, Sympozjum SAR "Poszukiwanie i Ratowanie Życia na Morzu", statek badawczo-szkoleniowy "Horyzont II", Gdynia 2001
• 8. Smolarek L - Wpływ sił wiatrowych na tratwę, Proc. VI Konferencja Naukowo-Techniczna “ Bezpieczeństwo Morskie i Ochrona Środowiska Morskiego”, Kołobrzeg 2002,Vol.1