Common civilian drones, mainly cross-axis quad-rotor drones.
How do quadrotor drones achieve ascent, hover and descent?
With the massive application of drones, the use of drone jammer is also increasing. According to Newton's third law, the forces act on each other. If an aircraft wants to run upward, it needs an upward force. The rotor, by constantly rotating, allows the air to flow quickly, like an electric fan blowing a gust of wind, and the rotor squeezes the air so that it flows downward. Conversely, the air has that upward force on the rotor. This is the principle of aircraft ascent. Quadrotor UAV can control the amount of ascent force by controlling the speed of motor rotation, the faster the speed, the higher the ascent force; the lower the speed, the lower the ascent force. Now define the ascent force of the motor rotation as F and the weight of the UAV as G. When F is greater than G, the UAV rises; when F is equal to G, the UAV hovers; when F is less than G, the UAV descends.
Taking X-mode flight as an example, how does a quadrotor drone achieve left and right navigation?
As shown above, the motor of the quadrotor drone M1/M2/M3/M4, where M1 and M3 are rotating in clockwise direction, and M2 and M4 are rotating in counterclockwise direction, so as to offset the horizontal combined force.
If the initial state of the UAV is hovering horizontally, if the motor speed of M2/M4 remains unchanged and the rotation speed of M1/M3 decreases, the UAV will turn horizontally clockwise; if the motor speed of M1/M3 remains unchanged and the rotation speed of M2/M4 decreases, the UAV will turn horizontally counterclockwise; if the rotation speed of M1/M2/M3/M4 becomes smaller at the same time, the UAV will descend vertically; if the rotation speed of M1/M2/M3/M4 If M1/M2/M3/M4 rotational speed becomes larger at the same time, the drone will rise vertically; if M1/M4 rotational speed remains unchanged and M2/M3 rotational speed becomes smaller, the right side of the drone body will be tilted down appropriately, generating horizontal rightward combined force and flying horizontally to the right; M2/M3 rotational speed remains unchanged and M1/M4 rotational speed becomes smaller, the left side of the drone body will be tilted down appropriately, generating horizontal leftward combined force and flying horizontally to the left.
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