JPH08152312A - Attack angle and lateral slip angle meter - Google Patents

Abstract

PURPOSE: To realize an attack angle/lateral slip angle meter having higher resolution of rotational angle as compared with a potentiometer. CONSTITUTION: The attack angle/lateral slip angle meter comprises a rotary shaft 8 provided with arrow vanes 1, 2 at one end, a rotor 5 secured to the other end of the rotary shaft 8 while having spiral circumference provided with a plurality of steps on the circular circumferential face, and a sensor 6 for receiving a laser beam projected toward the circular circumferential face of the rotor 5 and reflected. When the rotor 5 is rotated by means of the arrow vanes 1, 2, the distance between the circular circumferential face of the rotor 5 and the sensor 6 varies depending on the rotational angle and thereby the rotational angle can be detected by means of the sensor 6. When the steps are provided at fine pitch, the angle of attack and the angle of lateral slip can be measured accurately with high resolution and thereby the reliability and efficiency can be enhanced in the development and test of aircraft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle-of-attack / lateral glide meter applied to flight tests of developed aircraft.

[0002]

2. Description of the Related Art FIG.
As shown in Fig. 4, an arrow blade or the like attached parallel to the airframe is swung in the direction of the airflow to the airframe, whereby the rotating angle of the rotating shaft 08 is transmitted to the potentiometer 06 to be converted into an electric signal, and the airflow to the airframe The direction (angle of attack and sideways angle) was detected.

Since the conversion of the direction of the airflow into an electric signal is performed by the potentiometer 06, the angle resolution, linearity, etc., cannot be higher than the values of the potentiometer 06.

[0004]

Since the potentiometer is used in the conventional angle-of-attack / lateral glide meter,
The angle resolution cannot be increased beyond the area of the contact portion between the brush and the resistor in the potentiometer, and therefore it has been difficult to increase the angle resolution to 1 ° or more.

For this reason, it has been sometimes difficult to grasp the motion characteristics with respect to minute angles of attack and side slip angles in flight tests of the developed aircraft. The present invention is intended to solve the above problems.

[0006]

The angle-of-attack / lateral glide angle meter of the present invention has a rotary shaft having an arrow blade at one end, and is fixed to the other end of the rotary shaft so that its circumference is spirally formed. A rotating body provided with a plurality of steps on the circumferential surface, and a detection sensor for irradiating the circumferential surface of the rotating body with a laser beam and receiving the reflected light to measure the rotation angle of the arrow blade. Is characterized by.

[0007]

In the above, the detection sensor measures the distance from the detection sensor to the object surface by irradiating the object with a laser beam and receiving the reflected light.

Further, since the circumference of the rotating body irradiated with the laser beam is formed in a spiral shape and a plurality of steps are provided on the surface thereof, the circumferential surface of the rotating body and the detection sensor are The distance therebetween varies depending on the rotation angle of the rotating body.

Therefore, when the rotating body is rotated by the arrow blade, the rotation angle can be detected by the detecting sensor, and by increasing the number of steps, the resolution is higher and the resolution is higher than that of the conventional apparatus. It becomes possible to measure the angle of attack and the side slip angle.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An angle of attack / lateral glide meter according to an embodiment of the present invention will be described with reference to FIG. In the present embodiment shown in FIG. 1, a rotary shaft 8 having a side slip angle detecting arrow blade 1 provided at one end and the other end inserted into a housing 3 and supported by the housing 3 via a bearing 4, It is arranged at the other end of the rotary shaft 8 and is fixed by a nut 7 so that the circumferential direction has a step (minimum 0.2 m
m), which is formed in a spiral shape, and which is arranged at a constant interval from the rotor 5, irradiates a laser beam on the circumferential surface of the rotor 5 and receives the reflected light. The rotating body step detection sensor 6 is provided.

As for the angle-of-attack detecting blade 2, the rotary shaft 8 supported by the housing 3 via the bearing 4 and the other end of the rotary shaft 8 as in the case of the side-sliding angle detecting blade 1. A rotating body 5 fixed to the portion and a detection sensor 6 for irradiating the circumferential surface of the rotating body 5 with a laser beam and receiving the reflected light are provided.

In the above description, the casing 3 is mounted so that its axis is along the axis of the aircraft, and when the aircraft has an angle in the vertical direction with respect to the air flow, the attack angle detecting blade 2 is the casing. Tilt up and down with respect to the three axes. Similarly, the side-sliding angle detection arrow blade 1 also tilts with respect to the three axes of the housing when the vehicle body has an angle to the left and right.

At this time, the rotary shaft 8 rotates in response to the rotation of the arrow blade 2, and the rotating body 5 fixed to this by the nut 7 rotates by the rotation angle of the arrow blade 1. The rotating body 5 is shown in FIG.
As shown in (c), a step (minimum 0.2 mm) is provided in the circumferential direction according to the angle, and when the laser beam from the detection sensor 6 is applied to this, the reflected light is detected. Is received by.

The detection sensor 6 that receives the reflected light generates a voltage output according to the distance to the reflecting object. Therefore, the voltage output corresponding to the change in the measured distance due to the step change according to the rotation angle of the rotating body 5. Changes occur. Therefore, it is possible to obtain the voltage output corresponding to the rotation angle of the detection arrow blades 1 and 2, that is, the side slip angle or the attack angle, and the side slip angle or the attack angle can be measured.

Since the detection sensor 6 can detect a slight difference (0.2 mm) in the detection amount, it is possible to detect the rotation angle by providing a slight step on the rotating body. Has a high resolution.

[0016]

The angle-of-attack / lateral glide meter of the present invention has a rotary shaft having an arrow blade at one end and a rotary shaft which is fixed to the other end of the rotary shaft and has a spiral circumference. Since the rotating body is provided with a plurality of steps and the detection sensor that irradiates the circumferential surface of the rotating body with a laser beam and receives the reflected light, the rotating body rotates when the arrow blades rotate. Since the distance between the circumferential surface of and the detection sensor changes according to the rotation angle, it is possible to detect the rotation angle by the detection sensor, and by making the pitch of the step finer, compared to the conventional device. It becomes possible to measure the angle of attack and the side slip angle with high resolution and high accuracy, and the reliability and efficiency of the aircraft development test can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view of an angle-of-attack / lateral glide angle meter according to an embodiment of the present invention, (a) is an overall schematic view, (b) is an AA arrow view of (a), (c). FIG. 7B is a view as seen from the direction of arrows B-B in FIG. 7B, and FIG.

FIG. 2 is an explanatory diagram of a conventional angle-of-attack / lateral glide meter.

[Explanation of symbols]

 1 Side slip angle detection arrow blade 2 Attack angle detection arrow blade 3 Housing 4 Bearing 5 Rotating body 6 Rotating body step detection sensor 7 Nut 8 Rotating shaft

Claims (1)

[Claims] 1. A rotary shaft having an arrow blade at one end, a rotary body fixed to the other end of the rotary shaft, the circumference of which is spiral, and a plurality of steps being provided on the circumferential surface thereof, An angle-of-attack / lateral glide meter provided with a detection sensor for irradiating a laser beam on a circumferential surface of a rotating body and receiving reflected light thereof to measure a rotation angle of the arrow blade.