JPS62222104A - Small-sized angle detector - Google Patents

Abstract

PURPOSE:To obtain a small-sized detector performing highly accurate measurement, by providing a spherical container sealed with a fluidized material having conductivity in the main body of a model and measuring the electric resistance value in said container to detect the angle of the model. CONSTITUTION:The small-sized container 33 provided in the main body 31 of a model is sealed with a conductive fluidized material so as to set the liquid level thereof to the center of said container 33. When the main body 31 is inclined to an angle theta, because the liquid level in the small-sized container 33 always crosses a gravity direction at a right angle, the part contacted with mercury 34 of a resistance lead wire 35 also changes by the angle theta. As a result, because the resistance value of the lead wire 35 also changes, said resistance value is measured by a resistance measuring device 36 to make it possible to calculate the inclined angle theta of the main body 31. By this method, the angle of the posture of the model main body can be detected while measurement is performed on a small scale within a short time.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to flying objects such as airplanes and rockets.
This invention relates to a small angle producing device that detects a model V posture angle used in a clamp with a high degree of deflection.

[Conventional technology]

Wind tunnel tests and inspections of flying objects such as airplanes and rockets were conducted in 5-cooled formats, which were previously shown in A4 diagrams. In the figure, 11 is a model body, and 12 is a support body made of an elastic body. When it is desired to measure the attitude angle of the model main body II supported by the support body 12, the illustrated aerodynamic force F becomes cloudy on the model main body 11. Therefore, the support body 12 made of an elastic body is bent by an angle θ, and the set angle θ! This means that the actual attitude angle is different. For this reason, the minister's energy F, l! :
By calibrating the relationship with the deflection angle θ2, li4'! The attitude angle (θ1+08)'t- was directly calculated.

Apart from this, a method of directly determining the posture angle θ using an optical method using a laser beam or the like as shown in FIG. 5 has also been attempted. Referring to the same figure, a mirror is attached to the model body 21, and the model body 21 is irradiated with light from the light emitter 22, and the reflected light is obtained, and the model body 21 is pierced from the scale position.
The posture angle θ is measured as 1.

[The problem that the invention seeks to solve]

In the method shown in Fig. g4 above, the deflection angle θ1 of the support 12 is caused by the force F on the model body 1, but this F is also an unknown quantity that is desired to be determined by a wind tunnel test. Therefore, regarding the relationship between force F and angle θ1, it is necessary to calibrate the magnitude and direction of force F within a conceivable range in advance, which requires a great deal of time and effort.
Because it is an indirect measurement, accuracy and reliability are low.

In addition, the direct measurement method using the reflected light from the reflective surface optically attached to the model body 21 shown in FIG. 21, the measurement angle is low. Furthermore, the position of weighting the reflective surface moves due to the angle of change, making it difficult to find it, and this becomes even more noticeable especially when the reflective point of the model body 21 is a curved surface.

This invention was made in view of the above-mentioned circumstances.
The purpose of the present invention is to provide a small angle detector for wind tunnel testing that can perform measurements on a small scale and in a short time and has high measurement accuracy.

[Means and effects for solving the problems] This invention has the following features:
A spherical container filled with a conductive fluid, such as mercury, is provided inside the model body, and the 1-temperature resistance t inside the container, which changes depending on the tilt angle of the model, is measured, and from this resistance value. By detecting the above-mentioned angle, it is possible to perform a small and highly accurate measurement.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Figure IX1 shows the external structure of the model. Reference numeral 31 is a model body, 32 is a support body, and 33 is a small spherical container provided within the model body 31.

A 41-mercury fluid 1, for example, mercury 34, is sealed in this small container 33 so that the liquid level is at the center of the container 33. In addition, on the inner surface of the small container 33, the model body 31 is placed horizontally as shown in FIG.
Insert the resistance wire 3 so that it goes from the uppermost position on the inner surface of 3 to the lower position.
5 is attached, and both ends of this resistance conductor 350 are attached to the model body 3.
It is connected to an external resistance measuring device 36.

In such a detector, if the model body 3 is tilted at an angle θ as shown in FIG. 3, the liquid level in the small container 33 will always be perpendicular to the gravity direction, so The portion of the resistance conductor 35 that contacts the mercury 34 also changes by the angle θ. Consequently, the resistance value of the four resistor wires 35 also changes, so by measuring the change in resistance value with the resistance measuring device 36, it is possible to calculate the tilt angle θ of the model body 31. Become.

As the above detector, the inner diameter 8 dragon O is installed in the container #33 for small models.
Also, place the item in a container 33 for large models with an inner diameter of 16111 mm.
11D, the resistance value of the resistor 4a35 is set to 60 (Ω) for half the circumference of the spherical container 330, and the container 33 is connected to the model body 3.
When fixed to the reference surface of No. 1 with four screws, the conventional detectors shown in Fig. 44 and Fig. 5 can detect the angle θ at o, You can perform a degree yokode. Furthermore, the time required for starting is about one-tenth that of the conventional method, making it possible to carry out the process in a very short time.

[Invention O effect]

As described in detail above, according to the present invention, a model body is provided with a container in which a magnetically permeable fluid is sealed and conductive wires are arranged on the inner surface, and the position within the container is adjusted according to the inclination of the model body. The angle of inclination is calculated by detecting the resistance value of the conductor wire, which changes depending on the fluid being moved, using a resistance detector, so it is possible to perform measurements on a small scale and in a short time. It is possible to provide a compact angle detector that can simulate the attitude angle t of a model body in a wind tunnel test with high accuracy.

[Brief explanation of drawings]

Figures 1 to 31:A show one embodiment of the present invention; Figure 1 is a diagram showing the external appearance in a horizontal state; Figure 2 is a diagram showing groove molding, especially in the small container portion; Figure 3; 1 is a diagram showing the external configuration when the posture angle changes with respect to FIG. 1, and FIGS. 4 and 5 are diagrams showing the configuration of a conventional angle detector. 11.21.31...0 model body, 12.32... support, 22... light emitter, 33... small container, 34...
...Mercury, 35...Resistance conductor, 36...Resistance measuring device.

Claims (1)

[Claims] The contents of the model are placed on the standard surface with resistance conductors on the inner surface, the conductive fluid is sealed in this container, and the container moves in the direction of gravity as the attitude angle of the model changes. the resistance detecting means for detecting the resistance value of the resistance conductor that changes according to the positional movement of the conductive current conductor; and the angle calculating means for calculating the attitude angle of the model from the detection result by the resistance detecting means. A compact angle detector characterized by: