Patent Publication Number: US-2023159162-A1

Title: Aircraft flight control method

Description:
TECHNICAL FIELD 
     The present invention relates to an aircraft flight control method. 
     BACKGROUND ART 
     Currently, aircrafts capable of performing vertical take-off and landing are practically used. 
     However, since functions of the vertical take-off and landing are realized by including mechanisms dedicated for vertical take-off and landing, there is a problem that structures thereof are more complicated and heavier than those of airframes of ordinary take-off landing-type aircrafts. 
     There are problems that the mechanisms for vertical take-off and landing do not function at the time of ordinary flight, that tails thereof do not function at the time of vertical take-off and landing, and that heavy parts that do not contribute to flight are thus constantly included in the airframe. 
     Also, since the airframes are adapted to perform flight control using different mechanisms at the time of vertical take-off and landing and at the time of ordinary flight, it is necessary to learn these two control methods in order to cause the airframes to fly. 
     For these reasons, the airframes of vertical take-off and landing aircrafts cannot avoid a problem that mobility and cruising distance performance thereof are inferior to those of an ordinary take-off and landing type regardless of an increase in manufacturing, maintaining, and running costs as compared with the ordinary take-off and landing aircrafts. 
     SUMMARY OF INVENTION 
     Technical Problem 
     A problem to be solved is that current vertical take-off and landing aircrafts need two mechanisms and two different types of control for vertical take-off and landing and for ordinary flight. 
     Solution to Problem 
     The present invention is characterized by controlling vertical take-off and landing and ordinary flight using the same mechanism by introducing concepts of a shoulder rotational axis and an arm rotational axis into aircraft flight control. 
     Advantageous Effects of Invention 
     An aircraft that employs the flight control method according to the present invention has an advantage that since the aircraft does not have a mechanism and control dedicated for vertical take-off and landing even if the aircraft is a vertical take-off and landing aircraft, the aircraft has a simpler structure and can be manipulated by the same method as that of an ordinary take-off and landing aircraft that employs the present invention. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view of airframe coordinates of an airframe obtained by causing a shoulder rotational axis  2  on the left side to rotate to 55°, causing a shoulder rotational axis on the right side thereof to rotate to −35°, and causing both arm rotational axes  3  to rotate to 30° (first embodiment). 
         FIG.  2    is a front view of  FIG.  1   . 
         FIG.  3    is a side view of  FIG.  1   . 
         FIG.  4    is a bottom view of  FIG.  1   . 
         FIG.  5    is a plan view of the airframe coordinates of the airframe obtained by causing the shoulder rotational axes  2  and the arm rotational axes  3  to rotate in a bilaterally symmetric manner (to 55° and 30°, respectively) (first embodiment). 
         FIG.  6    is a side view of a spatial posture of the airframe that is horizontally flying in  FIG.  5   . 
         FIG.  7    is a plan view of the airframe coordinates of the airframe obtained by causing the shoulder rotational axes  2  and the arm rotational axes  3  to rotate in a bilaterally symmetric manner (to 33° and 52°, respectively) (first embodiment). 
         FIG.  8    is a side view of a spatial posture of the airframe with a nose lifted in  FIG.  7   . 
         FIG.  9    is a plan view of the airframe coordinates of the airframe obtained by causing the shoulder rotational axes  2  and the arm rotational axes  3  to rotate in a bilaterally symmetric manner (to 75° and 0°, respectively) (first embodiment). 
         FIG.  10    is a side view of a spatial posture of the airframe with the nose lowered in  FIG.  9     
         FIG.  11    is a plan view of the airframe coordinates of the airframe obtained by causing the shoulder rotational axes  2  to rotate in a bilaterally asymmetric manner (to 55° on the left side and to −35° on the right side) and causing the arm rotational axes  3  to rotate in a bilaterally symmetric manner (60°) (first embodiment). 
         FIG.  12    is a plan view of a spatial posture of the airframe that is circling in  FIG.  11   . 
         FIG.  13    is a back view of  FIG.  12   . 
         FIG.  14    is a front view of the airframe coordinates of the rolling airframe obtained by causing the shoulder rotational axes  2  to rotate in a bilaterally symmetric manner and causing the arm rotational axes  3  to rotate in a bilaterally asymmetric manner (first embodiment). 
         FIG.  15    is a perspective view of airframe coordinates of an airframe obtained by causing a shoulder rotational axis  2  on the left side to rotate to 45°, causing a shoulder rotational axis  2  on the right side to rotate to −35°, and causing both arm rotational axes  3  to rotate to 90° (second embodiment). 
         FIG.  16    is a front view of  FIG.  15   . 
         FIG.  17    is a side view of  FIG.  15   . 
         FIG.  18    is a plan view of the airframe coordinates of the airframe obtained by causing the shoulder rotational axes  2  and the arm rotational axes  3  to rotate in a bilaterally symmetric manner (to 45° and 90°, respectively) (second embodiment). 
         FIG.  19    is a side view of a spatial posture of the airframe that is horizontally flying in  FIG.  18   . 
         FIG.  20    is a plan view of the airframe coordinates of the airframe obtained by causing the shoulder rotational axes  2  and the arm rotational axes  3  to rotate in a bilaterally symmetric manner (to 25° and 90°, respectively) (second embodiment). 
         FIG.  21    is a side view of a spatial posture of the air frame with a nose lifted in  FIG.  20   . 
         FIG.  22    is a plan view of the airframe coordinates of the airframe obtained by causing the shoulder rotational axes  2  and the arm rotational axes  3  to rotate in a bilaterally symmetric manner (to 65° and 90°, respectively) (second embodiment). 
         FIG.  23    is a side view of a spatial posture of the airframe with the nose lowered in  FIG.  22   . 
         FIG.  24    is a plan view of the airframe coordinates of the airframe obtained by causing the shoulder rotational axes  2  to rotate in a bilaterally asymmetric manner (to 45° on the left side and to −35° on the right side) and causing the arm rotational axes  3  to rotate in a bilaterally symmetric manner (90°) (second embodiment). 
         FIG.  25    is a plan view of a spatial posture of the airframe that is circling in  FIG.  24   . 
         FIG.  26    is a back view of  FIG.  25   . 
         FIG.  27    is a diagram of a spatial posture of the airframe that is stopping in a space with the nose lifted, which is achieved by causing the shoulder rotational axes  2  and the arm rotational axes  3  to rotate in a bilaterally symmetric manner (to 25° and 90°, respectively) (second embodiment). 
         FIG.  28    is a plan view of a spatial posture of the airframe that is rotating about a yaw axis while stopping in a space with the nose lifted, which is achieved by causing the shoulder rotational axes  2  to rotate in a bilaterally symmetric manner and causing the arm rotational axes  3  to rotate in a bilaterally asymmetric manner (to 30° on the left side and to 120° on the right side) (second embodiment). 
         FIG.  29    is a side view of  FIG.  28   . 
         FIG.  30    is a plan view of a spatial posture of the airframe that is going backward while stopping in a space with the nose lifted, which is achieved by causing the shoulder rotational axes  2  and the arm rotational axes  3  to rotate in a bilaterally symmetric manner (to 25° and 120°, respectively) (second embodiment). 
         FIG.  31    is a plan view of the airframe coordinates of the airframe obtained by causing the shoulder rotational axes  2  to rotate in a bilaterally asymmetric manner (to 25° on the left side and to 0° on the right side) and causing the arm rotational axes  3  to rotate in a bilaterally symmetric manner (90°). 
         FIG.  32    is a plan view of a spatial posture of the airframe that is laterally moving while stopping in a space in  FIG.  31    (second embodiment). 
         FIG.  33    is a front view of  FIG.  32   . 
         FIG.  34    is a perspective view of a spatial posture of an airframe that is horizontally flying (third embodiment). 
         FIG.  35    is a plan view of a spatial posture of the airframe that is stopping in a space with a nose lifted (third embodiment). 
         FIG.  36    is a perspective view of  FIG.  35    (third embodiment). 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, three embodiments will be described. 
     First Embodiment 
       FIGS.  1  to  14    illustrate an aircraft of an ordinary take-off and landing type that performs flight control by the method of the present invention. 
       FIGS.  5  and  6    are an airframe coordinate diagram illustrating a state of shoulder rotational axes  2  and arm rotational axes  3  when the airframe is horizontally flying and a diagram of a spatial posture thereof when the airframe is flying in the state. The airframe horizontally balances the airframe and horizontally flies by causing the shoulder rotational axes  2  to rotate and setting lift force points  5  on the left and right sides of the airframe and a gravity center  4  of the airframe at the same positions in airframe coordinates Z, and adjusts directions of lift forces at the lift force points  5  generated in the wings  6  by causing the arm rotational axes  3  to rotate. 
       FIGS.  7  to  10    are airframe coordinate diagrams illustrating a pitch control method of the airframe and diagrams of spatial postures thereof. Pitch control for lifting a nose is performed using an action, which is caused by causing the shoulder rotational axes  2  to rotate to move the lift force points  5  on both sides of the airframe to the front side of the airframe beyond the gravity center  4  of the airframe, in which the gravity center  4  of the airframe rotates using a straight line connecting both the lift force points  5  as an axis and tends to move and be stabilized below the straight line. Similarly, the nose is lowered by moving both the lift force points  5  to the rear side of the airframe beyond the gravity center  4  of the airframe. 
       FIGS.  11  to  13    are an airframe coordinate diagram illustrating a circling control method of the airframe and diagrams of spatial postures thereof. A rotational angle of one of the two shoulder rotational axes  2 , whichever is located on the inner side at the time of circling, is reduced relative to a rotational angle of another axis located on the outer side to move the lift force point  5  located on the inner side of the circling to the front side of the airframe beyond the lift force point  5  located on the outer side, creating an inclination of the straight line connecting both the lift force points  5  with respect to an X axis, Y axis, and Z axis of the airframe coordinates. At this time, two types of control, namely nose lifting control and rolling control are achieved by a stabilizing action caused when the gravity center  4  of the airframe rotates about an axis with the inclination and tends to move below the axis. In addition, circling occurs such that yaw axis rotation about the wings  6  is controlled when the wing  6  on the inner side of circling with an increased angle of attack is decelerated due to air resistance because the rotational angle of the shoulder rotational axis  2  is reduced. 
       FIG.  14    is an airframe coordinate diagram illustrating a rolling control method of the airframe. Rolling control is performed by causing the arm rotational axes  3  to rotate in a bilaterally asymmetric manner and inclining the directions of the lift forces in a bilaterally asymmetric manner. 
     Second Embodiment 
       FIGS.  15  to  33    illustrate an aircraft of a vertical take-off and landing type that performs flight control by the method according to the present invention. 
       FIGS.  18  and  19    are an airframe coordinate diagram of the airframe at the time of horizontal flight and a diagram of a spatial posture thereof. The second embodiment has no differences from the first embodiment in terms of the control method and is different from the first embodiment only in that a propeller rotation plane  8  is a lift force source of the airframe instead of the wings  6 . 
       FIGS.  20  to  23    are airframe coordinate diagrams illustrating a pitch control method of the airframe and diagrams of spatial postures thereof. The control method is the same as that in the first embodiment. 
       FIGS.  24  and  26    are an airframe coordinate diagram illustrating a circling control method of the airframe and diagrams of spatial postures thereof. This control method is the same as that in the first embodiment and is different therefrom only in that the propeller rotation plane  8  rather than the wings  6  is an air resistance source used to obtain yaw axis rotation of the airframe. 
     The rolling control method of the airframe is also the same as that in the first embodiment. 
       FIG.  27    is an airframe coordinate diagram when the airframe is stopping in a space with the nose lifted. This pitch control is also the same as that in the first embodiment. 
       FIG.  28    is a diagram of a spatial posture when the airframe rotates about the yaw axis while stopping in the space with the nose lifted. The yaw axis rotation control about the airframe is performed by causing the arm rotational axes  3  to rotate in a bilaterally asymmetric manner and inclining the directions of the lift forces at the lift force points  5  in a bilaterally asymmetric manner. 
       FIG.  29    is a side view of  FIG.  28   . 
       FIG.  30    is a diagram of a spatial posture when the airframe is going backward while stopping in a space with the nose lifted. The airframe goes back by causing the arm rotational axes  3  to rotate in a bilaterally symmetric manner and inclining the directions of the lift forces at both the lift force points  5  on the rear side of the airframe. 
       FIG.  31    is an airframe coordinate diagram when the airframe is moving in the lateral direction of the airframe while stopping in a space with the nose lifted. The rotational angle of the axis of the two shoulder rotational axes  2 , whichever is located on the front side in an advancing direction at the time of lateral movement, is reduced relative to the other axis on the rear side to move the lift force point  5  located on the front side in the advancing direction to the front side of the airframe beyond the lift force point  5  on the rear side, creating an inclination of the straight line connecting both the lift force points  5  with respect to the X axis, the Y axis, and the Z axis of the airframe coordinates. At this time, nose lifting control and rolling control are achieved by a stabilizing action caused when the gravity center  4  of the airframe rotates about an axis with the inclination and tends to move below the axis. As a result, lateral movement occurs by using the inclination of the directions of the lift forces at the lift force points  5  in the lateral direction along with the airframe. 
       FIGS.  32  and  33    are diagrams of spatial postures in  FIG.  31   . 
     Third Example 
       FIGS.  34  to  36    illustrate a vertical take-off and landing aircraft that employs claim  2  of the present invention and includes jet engines on the wings  6 . The flight control method of the airframe is the same as that in the second embodiment.