Parachute opening and separating control algorithm for brake parachute of manned spacecraft reentry capsule

Abstract

The invention belongs to the technical field of aviation, and particularly relates to a brake parachute opening and separation control algorithm for a manned spacecraft reentry capsule, which comprises the following steps of: providing a current pitch angle speed q and a current yaw angle speed r by using an inertial measurement unit in the manned spacecraft reentry capsule to calculate an attitude angle change rate RSS of the reentry capsule; controlling the brake parachute to be opened by comparing the return capsule attitude angle change rate RSS with the RSS parachute opening threshold value, judging the brake parachute separation condition by comparing the return capsule attitude angle change rate RSS with the RSS separation threshold value or comparing the OF value with the OF separation threshold value, or sending a brake parachute separation instruction when the pitch angle speed q is located at the falling edge and within the specific interval range. According to the algorithm, the oscillation amplitude of the return capsule in the period from brake parachute opening to main parachute opening is remarkably reduced, and the situation that the large bottom faces forwards and is not beneficial to main parachute opening is reduced.

Description

technical field [0001] The invention belongs to the field of aviation technology, and in particular relates to a control algorithm for the opening and separation of a deceleration parachute used in the return cabin of a manned spacecraft. Background technique [0002] When the return capsule descends below 20km, the flight Mach number is less than 1, and the return capsule flies at subsonic speed. At this time, the attitude is unstable, and it is prone to relatively large swings, plane rotations, and rollovers. decrease, this phenomenon will become more and more serious. Relying solely on the control system to maintain the attitude of the return capsule will consume a lot of energy, so a drogue parachute is required. The deceleration parachute, also known as the stable deceleration parachute, has the characteristics of high parachute opening dynamic pressure and large load. It creates favorable conditions for the main parachute to open, plays a key role in the aerodynamic d...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of drogue parachute parachute opening and separation control algorithm for manned spacecraft return cabin in order to overcome the deficiencies in the prior art. The attitude and oscillation amplitude of the return capsule are not taken into account when re-entry, which may hinder the opening of the main parachute

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