Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: ship deck operation

Sortuj według:

Ogranicz wyniki do:

A simulation analysis of behaviour of ship-borne helicopter main rotor due to ship motion

Stanisławski J.

Journal of KONES

2016

Vol. 23, No. 1

313--320

The paper presents a simulation method of analysis of the couplings between rotor blades motion and helicopter fuselage standing on ship deck at the phase of take-off or landing when whirling rotor generates thrust less than weight of the helicopter. The oscillating motion of the ship deck due to waves is considered. The physical model includes the helicopter fuselage treated as the stiff body supported by units of springs and dampers corresponding to landing gear characteristics. The rotor blades are modelled by elastic axes with distributed lumped masses of blade segments. The equations of fuselage and rotor blades motion are solved applying Runge-Kutta method. According to the Galerkin method, parameters of rotor blades motion are assumed as a resultant combination of considered blade torsion and bending eigen modes. Data of the light helicopter with three-bladed rotor are applied for the simulation of the rotorcraft behaviour aboard the ship. The calculations concerning helicopter standing on the fixed plane and on oscillating ship deck show influence of ship movement on fuselage motion and rotor blades deflections, flapping, and lead-lag motion. Moreover, simulations show influence of the side wind and control of the rotor swash-plate deflections. The additional unit of blade eigen modes and frequencies is applied to model the blade hitting to the flapping limiter, which can occur at the low rotation speed of the rotor. Temporary contact of the articulated blade with limiter changes its boundary conditions, which can rapidly increase the blade bending moments. The simulation method enables to determine conditions of safe operations of ship-borne helicopters without exceeding the limits and generating the excessive blade loads.