A trim control design method for high speed helicopter with coaxial thrust rotor is presented

Abstract

A trim control design method for a high speed helicopter with a coaxial thrust rotor is provided. At first, that balan equations of the airframe degree of freedom are established, Aiming at the multi-round iterative design process of trim manipulation, 6 manipulator and 2 attitude angles are use as trim variables, The trimming of the small speed segment, the transition velocity segment and the large velocity segment are respectively performed from the angle decoupling of the vertical and horizontal variables, the influence of the variable on the strength and weakness of the equilibrium equation, and the increase of the equality constraint. balancing the same number of variables and equations in each round of balancing, the previous round of balancing provides the necessary parameter basisfor the next round of balancing, progressing step by step, checking and correcting, and completing the balancing after four rounds of calculation. The present application reduces the calculation time,facilitates the engineering application of the trim control design method, and improves the practical value of the design method.

Description

technical field

[0001] The invention belongs to the technical field of helicopter flight mechanics, in particular to a trim control design method applied to a coaxial high-speed helicopter with thrust paddles. Background technique

[0002] Coaxial high-speed helicopters have multiple aerodynamic surfaces such as two rotors (variable speed), tail thruster, and vertical tail, and the flight envelope covers a speed range from 0 to about 450km / h. In the medium speed and high speed section, the two rotors of the helicopter are unloaded while moving backward, and by reducing the rotor speed, the vertical pulling force is mainly used to generate the vertical direction during the high-speed forward flight, thereby delaying the excitation on the rotor blades. Wave and stall limitations on helicopter takeoff speed. Since the lift and propulsion generation methods of coaxial high-speed helicopters are very different from those of conventional configuration helicopters, it is necessary...

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