7results about How to "Reduce angular velocity" patented technology

The invention relates to the technical field of welding wire drawing equipment, in particular to flux-cored wire drawing equipment. According to the technical scheme, the device comprises a rack, a winding drum for winding welding wires is rotationally installed on the rack, a wiring mechanism enabling the welding wires to be evenly distributed on the winding drum is installed on the rack, a power mechanism for driving the winding drum to rotate is installed on the rack, the device further comprises a constant-speed control component, and the constant-speed control component is installed on the rack. The constant-speed control component controls the rotating speed of the winding drum according to the current diameter of superposition after the winding drum is wound with the welding wire. When the diameter of the winding drum is gradually increased, the diameter of a circle formed by the multiple tensioning blocks is reduced, then the angular speed of the winding drum is reduced, the linear speed of the edge of the winding drum is kept unchanged, and then the stretching speed of a welding wire can be kept unchanged; and therefore, the same batch of welding wires wound on the same winding drum can be kept at a constant stretching speed, and the same quality of the same batch of welding wires is effectively ensured.

The utility model discloses a cold stamping film constant-speed rewinding device which comprises an unwinding shaft and a rewinding shaft used for rewinding a cold stamping film, the rewinding shaft is connected with a rewinding motor, and a tensioning shaft used for tensioning the cold stamping film wound between the unwinding shaft and the rewinding shaft is arranged between the unwinding shaft and the rewinding shaft. The rewinding motor is electrically connected with a control system used for controlling on-off and angular velocity of the rewinding motor, the encoder is used for collecting linear velocity of a cold stamping film, is arranged between the unwinding shaft and the rewinding shaft and is close to the cold stamping film, and the encoder is electrically connected with the control system. The control system is used for controlling the rewinding motor to reduce the angular speed of the rewinding motor after the linear speed of the cold stamping film exceeds the preset speed of the system. According to the rewinding device, the cold stamping film can be rewound at the uniform linear speed, and the situation that the cold stamping film is snapped due to the fact that the linear speed is too high when the cold stamping film is rewound is avoided.

The invention provides a space target tracking method and device using linear array camera push-broom imaging. The method comprises the following steps: calculating a velocity vector and a position vector of a satellite pointing to a space target at a center intersection moment according to position vectors and velocity vectors of the satellite and the space target in an inertial system; obtaining an attitude angle of the satellite pointing to the space target at the center intersection moment based on the position vector of the satellite pointing to the space target; according to the position vector and the relative velocity vector of the satellite pointing to the space target, the attitude angle and the Euler axis of satellite push-broom are obtained; obtaining an inertial quaternion and an inertial angular velocity of the space target at the current moment based on an attitude angle of the satellite pointing to the space target, an attitude angle of satellite push-broom and an Euler axis; and according to the inertial quaternion and the inertial angular velocity of the space target, calculating the attitude control moment of the satellite at the current moment so as to drive the satellite to track the space target in real time. According to the scheme, high-resolution imaging of the space target can be realized.

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 present invention relates to the technical field of welding wire drawing equipment, and in particular to a flux-cored welding wire drawing equipment. Its technical solution includes: a frame, a reel for winding welding wire is rotatably mounted on the frame, a wiring mechanism for evenly distributing welding wire on the reel is mounted on the frame, a power mechanism for driving the reel to rotate is mounted on the frame, and also includes a constant speed control component, the constant speed control component is mounted on the frame, and the constant speed control component controls the rotation speed of the reel according to the current diameter superimposed after the reel is wound with welding wire. The present invention reduces the diameter of the circle formed by multiple tensioning blocks as the diameter of the reel gradually increases, thereby reducing the angular velocity of the reel to keep the linear velocity of the edge of the reel unchanged, thereby keeping the speed at which the welding wire is stretched unchanged, thereby keeping the same batch of welding wires wound on the same reel at a constant stretching speed, and effectively ensuring the same quality of the same batch of welding wires.

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.