27

2022

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01

Some Basic Common Sense Of Damper


When the aircraft climbs to a high altitude, due to the reduction in air density (change in aerodynamic properties), the damping of the aircraft decreases, causing the aircraft to swing easily. Consider the case where oscillation occurs due to the small pitch damping of the aircraft. In order to suppress the sway, the pilot needs to push the joystick when the plane is ascending to prevent the plane from ascending, and pull the stick when the plane is descending to prevent the plane from descending. It is difficult for the pilot to complete the task while stabilizing the aircraft. In order to improve this situation and reduce the workload of the pilot, a device was invented to replace the pilot to complete this complicated operation, namely the shock absorber. The above is just an example of pitch. In fact, roll and yaw are similar. Shock absorbers are divided into pitch shock absorbers, roll shock absorbers and yaw shock absorbers. When we understand the working content of the damper, it is easy to understand the working principle of the damper. Angular velocity is created when the aircraft swings, and suppressing the swing actually counteracts the angular velocity by deflecting the rudder face in the opposite direction. The sensor for measuring the angular velocity of the aircraft is installed on the aircraft. The aircraft has three axes, so three angular velocity sensors are required. When the aircraft swings, the sensor senses the angular velocity, processes the angular velocity, generates commands to drive the corresponding rudder surface, and the rudder surface deflects to suppress the swing. This is how the damper works. When we understand the working content of the damper, it is easy to understand the working principle of the damper. Angular velocity is created when the aircraft swings, and suppressing the swing actually counteracts the angular velocity by deflecting the rudder face in the opposite direction. The sensor for measuring the angular velocity of the aircraft is installed on the aircraft. The aircraft has three axes, so three angular velocity sensors are required. When the aircraft swings, the sensor senses the angular velocity, processes the angular velocity, generates commands to drive the corresponding rudder surface, and the rudder surface deflects to suppress the swing. This is how the damper works. When we understand the working content of the damper, it is easy to understand the working principle of the damper. Angular velocity is created when the aircraft swings, and suppressing the swing actually counteracts the angular velocity by deflecting the rudder face in the opposite direction. The sensor for measuring the angular velocity of the aircraft is installed on the aircraft. The aircraft has three axes, so three angular velocity sensors are required. When the aircraft swings, the sensor senses the angular velocity, processes the angular velocity, generates commands to drive the corresponding rudder surface, and the rudder surface deflects to suppress the swing. This is how the damper works. Angular velocity is created when the aircraft swings, and suppressing the swing actually counteracts the angular velocity by deflecting the rudder face in the opposite direction. The sensor for measuring the angular velocity of the aircraft is installed on the aircraft. The aircraft has three axes, so three angular velocity sensors are required. When the aircraft swings, the sensor senses the angular velocity, processes the angular velocity, generates commands to drive the corresponding rudder surface, and the rudder surface deflects to suppress the swing. This is how the damper works. Angular velocity is created when the aircraft swings, and suppressing the swing actually counteracts the angular velocity by deflecting the rudder face in the opposite direction. The sensor for measuring the angular velocity of the aircraft is installed on the aircraft. The aircraft has three axes, so three angular velocity sensors are required. When the aircraft swings, the sensor senses the angular velocity, processes the angular velocity, generates commands to drive the corresponding rudder surface, and the rudder surface deflects to suppress the swing. This is how the damper works. The sensor for measuring the angular velocity of the aircraft is installed on the aircraft. The aircraft has three axes, so three angular velocity sensors are required. When the aircraft swings, the sensor senses the angular velocity, processes the angular velocity, generates commands to drive the corresponding rudder surface, and the rudder surface deflects to suppress the swing. This is how the damper works. The sensor for measuring the angular velocity of the aircraft is installed on the aircraft. The aircraft has three axes, so three angular velocity sensors are required. When the aircraft swings, the sensor senses the angular velocity, processes the angular velocity, generates commands to drive the corresponding rudder surface, and the rudder surface deflects to suppress the swing. This is how the damper works.

   For the sake of explanation, take the aircraft oscillation as an example. In fact, when the pilot is in normal control of the aircraft, the dampers serve a similar function, quickly stabilizing the aircraft to the target attitude. The pitch damper drives the elevator to work according to the pitch rate, the roll damper drives the aileron to work according to the roll rate, and the yaw damper drives the rudder to work according to the yaw rate. Because the lateral and directional signals are coupled to each other, the lateral and directional signals are cross-linked, which means that the ailerons and rudder work together at the same time. After the lateral and heading plugs are exchanged, the roll command signal and the yaw command signal are exchanged, and the command enters the wrong channel. That is to say, the original command to deflect the aileron is used to drive the rudder, and the command to drive the rudder is used to drive the aileron.

  Why did the plane become unstable after the swap? Now we need to introduce another concept, the stability of the flight control system. Dampers are also part of the flight control system. The soul of the flight control system is the control law, which is directly related to whether the aircraft is easy to fly, and even affects the safety of the aircraft. The designer needs to carefully assign a large number of parameters of the control law so that it works coherently and with some stability.

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