Motion modeling and decoupling method for air-launched cruise aircraft with brake parachute

Abstract

The invention relates to a motion modeling and decoupling method for an air-launched cruise aircraft with a brake parachute. The method comprises the following steps: step 1, carrying out dynamics andkinematics modeling on a parachute ejection system; 2, solving the acceleration of a connection point by using rigid body kinematics and dynamics knowledge; 3, carrying out equal decoupling by usingthe acceleration of the connection point of the projectile body and the brake parachute; 4, carrying out connection comparison simulation with a spring. The invention has the advantages that 1, the parachute ejection system is regarded as spherical hinge connection, an original simplified six-degree-of-freedom parachute ejection model connected through a spring is expanded to nine degrees of freedom, the simulation calculation precision and the calculation efficiency are improved, and higher numerical calculation stability is achieved; 2, the analytical solution precision of the rigid hinge interaction force of the missile-parachute system model is higher, more actual conditions can be simulated, and reference can be provided for parameter design of an air-launched weapon pilot with a brake parachute;.

Description

technical field [0001] The invention provides a motion modeling and decoupling method for an airdrop cruise aircraft with a drogue parachute based on the analytical solution of the hinge point interaction force, which belongs to the field of aviation flight technology. Background technique [0002] When airdropping weapons are air-dropped, since the flight speed and flight attitude of the carrier aircraft cannot meet the ignition conditions of the projectile engine, at the same time, in order to control the attitude and speed of the projectile when the engine is ignited, the deceleration parachute can be used to adjust the deceleration after the projectile leaves the aircraft. posture. At the beginning of the 20th century, some scholars conducted research on the object-umbrella system. In the 1960s, Neustadt established the plane motion model of the object-umbrella system, and then White and Wolf established a 5-degree-of-freedom three-dimensional dynamic model of the system...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the fact that the traditional simplified six-degree-of-freedom model of the parachute system cannot meet the actual needs, the present invention assumes that the drogue parachute is a rigid body in the stable motion stage and assumes that the parachute is connected by a spherical hinge, that is, there is no moment between the projectile and the parachute. Establish a nine-degree-of-freedom multi-rigid body model of the parachute system, and solve the analytical solution of the interaction force at the connection point through the characteristics of the same acceleration at the joint of the parachute system

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