10.1 Aerodynamic Attitude Control Principle
and Attitude Control Method of Aircraft
Aiming at the complex and difficult structure of hydraulic, electric, and gas steering
gears for conventional attitude control of aircraft, a new attitude control method
using jet reaction force of aircraft is proposed. The flight control device based on
this method is portable, basically not limited by flight altitude, and its structure is
simple and easy to realize. Nitrogen is stored at high pressure and injected at
supersonic speed through Laval nozzle after decompression. The reaction force
between nitrogen and ambient atmosphere is formed to control the attitude of the
aircraft. When eight nozzles are arranged circumferentially, different combinations
of forces are formed when different nozzles are opened, and 64 possible lateral
forces of control attitude can be obtained. A series of experiments and comparative
analysis are carried out for the lateral force of attitude control. The theoretical
results are basically consistent with the experimental results, and the validity of the
method is verified. With the same nozzle and gas source, the lateral force provided
by each nozzle is the same, which can be extended to nozzles with different
parameters, and the lateral force provided by each nozzle is different. The proposed
analysis method and results can be used as a reference for the demonstration of
aircraft attitude control.
10.1.1 New Method and Principle of Attitude Control
of Aircraft
Figure 10.1a is the schematic diagram of attitude control method for single jet
reaction force, and Fig. 10.1b, c are the schematic diagram of two parallel jet
reaction force control devices. Eight nozzle reaction force control devices are
connected in parallel on the same high-pressure cylinder. Each nozzle can work
intermittently according to the need. The solenoid valve controls the nozzle switch
and obtains different combinations of nozzle reaction force to realize the pitch, yaw,
and roll attitude control of the aircraft. As shown in Fig. 10.1b, the attitude control
device of the aircraft consists of eight parallel devices, which distribute circumferentially on the missile body of the aircraft. The reaction force provided acts on
the radial direction of the aircraft and can directly control the pitch and yaw of the
aircraft. When the distribution of nozzles deviates from a certain radial angle, as
shown in Fig. 10.1c, the reaction force provided generates a torque on the centroid
of the aircraft. When multiple nozzles work together, the roll of the aircraft can be
controlled. As shown in Fig. 10.1a, the working principle of a single jet reaction
force control device is as follows: The high-pressure gas is stored in the cylinder.
Under the action of given current, the explosive tube explodes, the valve of the
164
10 Application of Aerodynamic Technology in Attitude Control …
and Attitude Control Method of Aircraft
Aiming at the complex and difficult structure of hydraulic, electric, and gas steering
gears for conventional attitude control of aircraft, a new attitude control method
using jet reaction force of aircraft is proposed. The flight control device based on
this method is portable, basically not limited by flight altitude, and its structure is
simple and easy to realize. Nitrogen is stored at high pressure and injected at
supersonic speed through Laval nozzle after decompression. The reaction force
between nitrogen and ambient atmosphere is formed to control the attitude of the
aircraft. When eight nozzles are arranged circumferentially, different combinations
of forces are formed when different nozzles are opened, and 64 possible lateral
forces of control attitude can be obtained. A series of experiments and comparative
analysis are carried out for the lateral force of attitude control. The theoretical
results are basically consistent with the experimental results, and the validity of the
method is verified. With the same nozzle and gas source, the lateral force provided
by each nozzle is the same, which can be extended to nozzles with different
parameters, and the lateral force provided by each nozzle is different. The proposed
analysis method and results can be used as a reference for the demonstration of
aircraft attitude control.
10.1.1 New Method and Principle of Attitude Control
of Aircraft
Figure 10.1a is the schematic diagram of attitude control method for single jet
reaction force, and Fig. 10.1b, c are the schematic diagram of two parallel jet
reaction force control devices. Eight nozzle reaction force control devices are
connected in parallel on the same high-pressure cylinder. Each nozzle can work
intermittently according to the need. The solenoid valve controls the nozzle switch
and obtains different combinations of nozzle reaction force to realize the pitch, yaw,
and roll attitude control of the aircraft. As shown in Fig. 10.1b, the attitude control
device of the aircraft consists of eight parallel devices, which distribute circumferentially on the missile body of the aircraft. The reaction force provided acts on
the radial direction of the aircraft and can directly control the pitch and yaw of the
aircraft. When the distribution of nozzles deviates from a certain radial angle, as
shown in Fig. 10.1c, the reaction force provided generates a torque on the centroid
of the aircraft. When multiple nozzles work together, the roll of the aircraft can be
controlled. As shown in Fig. 10.1a, the working principle of a single jet reaction
force control device is as follows: The high-pressure gas is stored in the cylinder.
Under the action of given current, the explosive tube explodes, the valve of the
164
10 Application of Aerodynamic Technology in Attitude Control …