3results about How to "Reduce angular velocity" patented technology

The invention belongs to the technical field of aviation lifesaving, and provides a parachute opening control method for reducing the breakage probability of a lifesaving parachute, which comprises the following steps of: determining a coordinate system of a person-chair system; when seat ejection is started, current speed, sky velocity, height, attitude and attitude angular velocity parameters are inquired in real time, and after a secondary power main rocket flames out, roll angular velocity and pitch angular velocity are controlled by percussion of an attitude rocket, so that parachute ejection in a high angular velocity state is avoided; when the current speed and the height are both smaller than or equal to the preset values, whether the sky-direction speed is smaller than 0 is judged; if the sky-direction speed is smaller than 0, separating parachute shooting is completed; otherwise, continuing to wait for the sky direction speed to be less than 0. The problem that a parachute canopy is damaged due to the rope sail phenomenon caused by torsion of a parachute rope due to rotation of a parachute box during parachute ejection in an existing reverse pulling method is solved, and the probability of lifesaving failure is reduced.

The utility model relates to a kind of multistage adjusting winding device of heating film forming winding, including side plate one;Winding assembly, winding assembly is installed on side plate one, winding assembly is used to wind heating film, winding assembly includes servo motor one and reel, both ends of reel are equipped with fixed sleeve, fixed sleeve is fixedly connected with the output shaft of servo motor one, fixed sleeve is rotatably installed in side plate one, the side wall of fixed sleeve away from servo motor one is fixedly installed with combination wheel, by the use of winding assembly and grading speed regulating component, the speed of the film roll rotating gradually increasing diameter in winding process can be multistage speed reduction adjustment, according to the diameter of film roll increases and reduces angular velocity, and then prevent the problem that the film to be wound on film roll is gradually accelerated to stretch and gradually increases the pulling force, it is favorable to better protection to film, prevent heating film from being damaged by pulling, convenient to use.

The embodiment of the present application relates to the technical field of spacecraft, and particularly relates to a rate damping control method and device under the condition of gyro saturation. The method comprises the following steps: establishing a gyro matrix according to the installation coordinates of three gyros; establishing a first relationship between the angular velocity of the three gyros and the angular velocity of a control coordinate system according to the gyro matrix; establishing a second relationship between the moment and the gyro angular velocity according to the first relationship and a dynamic equation; establishing a Lyapunov function representing the velocity according to the gyro angular velocity, the moment of inertia and the gyro matrix, and deriving to obtain a velocity derivative expression; establishing a velocity damping control law between the damping matrix, the gyro angular velocity measurement value and the moment; establishing a third relationship for expressing the velocity derivative by using the gyro angular velocity measurement value and the damping matrix according to the velocity derivative expression and the velocity damping control law; and determining the damping matrix according to the third relationship so that the velocity derivative is a non-positive number. According to the scheme, the rate damping control can be performed under the condition of gyro saturation.