JP3491041B2 - Wind tunnel model for magnetic force support - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is used in a wind tunnel test using a wind tunnel equipped with a magnetic support balance device,
The present invention relates to a magnetic force supporting wind tunnel model magnetically supported by a magnetic force acting between a magnetic force supporting balance device and a magnet provided therein.

[0002]

2. Description of the Related Art Conventionally, in order to obtain the aerodynamic characteristics of an object with a model, it has been general practice to support the model with a support in the measurement section of the wind tunnel equipment. Therefore, the test results cannot be directly adopted as the aerodynamic characteristics of the model. Therefore, it has been proposed to support the model with magnetic force in a wind tunnel test. Since the support is unnecessary by magnetically supporting the model, the aerodynamic influence around the model due to the presence of the support can be eliminated.

In a wind tunnel test in which a model is magnetically supported, it is necessary to provide a mark or a painted surface on the model surface in order to measure the position and posture of the model. That is, gravity, air resistance, and lift force act on the models placed in the airflow, and they try to change the position and posture of the models every moment, so against the forces and moments acting on these models, It is necessary to control the magnitude and direction of the magnetic force of the model support so as to keep the model in a predetermined position and posture. When measuring the position and orientation of the model, the model should not be affected by the measurement, so it is preferable to optically observe from the outside. Therefore, the position or posture of the model is measured by attaching a mark to the surface of the model or forming a painted surface and observing the mark or the painted surface.

However, in the wind tunnel test, since different models naturally have different shapes if different objects for which aerodynamic characteristics are to be obtained, models having a predetermined outer shape are individually manufactured, and the surface of each model is marked or painted. Moreover, it is necessary to carry out a calibration test of the model position and orientation measurement sensor. These model making, painting work and calibration test are preparatory work for the wind tunnel test, but it takes a long time and manual labor, and the model manufacturing cost becomes expensive, and the time and cost of the wind tunnel test are increased. From the viewpoint, it hinders efficient implementation.
In addition, the markings and the paint itself must not affect the air flow around the model.

By the way, in the wind tunnel test, in order to obtain a satisfactory aerodynamic test result, the outer shape of the model that determines the air flow around the model is exactly the same as the outer shape of the actual object to be tested. Alternatively, the position and orientation of the model need not necessarily be based on the information on the model surface, although it needs to have a scaled outer shape.

[0006]

Therefore, the outer shape of the model for obtaining the aerodynamic test result in the magnetic levitation-supported wind tunnel test is the same as the outer shape of the actual product or a reduced outer shape as in the conventional case. , For the measurement object for measuring the position and posture of the model, try to separate it from the outer shape,
There is a problem to be solved in that the mark provided inside the model can be measured.

An object of the present invention is to provide a measurement target for measuring the position and orientation of the model inside the model as a mark body for measurement separately from the model outer shape, which is a preparatory work for a wind tunnel test. Of the manufacturing, painting work and calibration tests, the formation of marks for each model and the calibration test can be omitted, the model can be manufactured at low cost, and the wind tunnel test can be efficiently performed in terms of time and cost. It is to provide a wind tunnel model.

[0008]

In order to solve the above-mentioned problems, the wind tunnel model for magnetic force support according to the present invention is used in a wind tunnel test using a wind tunnel equipped with a magnetic force support balance device, and is compatible with the magnetic force support balance device. In a wind tunnel model including a magnet body that is levitationally supported by a magnetic force acting between them, a mark having an outer body made of transparent resin and a mark attached inside the outer body and optically detectable through the outer body It is characterized by having a body.

According to this magnetic force supporting wind tunnel model, the outer body is made of a transparent resin material, for example, in a scaled-down shape of an actual object, and an optically detectable mark is passed through the outer body inside the outer body. The mark body with is attached for measurement to measure the position and orientation of the model. When the outer body changes its position or posture, the mark inside the outer body also changes its position or posture, and since the outer body is transparent, the change in the position or posture of the mark is not interfered by the outer body and is optically transmitted from the outside. To be measured. The outer body must be manufactured for each model, but the manufactured mark bodies are compatible with each other, and the mark body used for another model can be used as it is. For such marks, once the sensor calibration test is performed and the data is saved, the sensor calibration test data will remain as it is when the mark body with the mark is used for another model. It is available. Also, since the mark body is attached inside the model,
The mark and the mark body do not affect the flow around the model.

In this magnetic force supporting wind tunnel model, the mark body can be constituted by the magnet body having the mark on its surface. Inside the outer body, a magnet body that magnetically interacts with the magnetic support balance device provided in the wind tunnel is arranged. Therefore, by using this magnet body, a mark is attached to the surface of the magnet body to make a mark. It is preferable that Since the mark and the magnet body are integrated, when the same mark body is used for a model of different external body, the magnetic force calibration test using the standard weight for the magnet body also needs to be performed again like the sensor calibration test. There is no.

In this magnetic force supporting wind tunnel model, the magnet body may be a cylindrical magnet whose central axis is arranged along the longitudinal axis of the wind tunnel model. By using a cylindrical magnet as the magnet body, it is possible to effectively draw out the interaction with the magnetic line from the magnetic force supporting balance device and efficiently control the displacement and posture of the model. In particular, from the viewpoint of controllability of the magnetic force supporting balance apparatus in which a flying object is used as a test object, it is preferable that the central axis of the cylindrical magnet is arranged along the front-back direction of the model.

In this magnetic force supporting wind tunnel model, the outer body can be resin-molded into a thin shell shape. The transparent resin is formed into a thin shell by blow molding or molding.
By molding the outer body with a thin shell, the amount of resin used for the outer body is reduced, which is advantageous in terms of manufacturing cost. Also, the weight of the model can be reduced.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a wind tunnel model for supporting magnetic force according to the present invention will be described below with reference to the drawings. 1 is a perspective view showing an embodiment of a magnetic force supporting wind tunnel model according to the present invention, FIG. 2 is a perspective view showing another embodiment of a magnetic force supporting wind tunnel model according to the present invention, and FIG. 3 is a magnetic force supporting wind tunnel model according to the present invention. FIG. 4 is an explanatory view of a magnetic force supporting type wind tunnel to which the wind tunnel model is applied, and FIG. 4 is a conceptual diagram of a magnetic force supporting balance device in the magnetic force supporting type wind tunnel shown in FIG.

First, with reference to FIGS. 3 and 4, an outline of a magnetic force supporting type wind tunnel and a magnetic force supporting balance apparatus in the wind tunnel will be described. The magnetic force support balance device 20 is a wind tunnel model for magnetic force support (hereinafter, referred to as “wind tunnel model” in the description of the embodiments) in order to avoid interference between the support device and the air flow associated with model support.
This is a device for supporting 1 in the air flow by magnetic force, and it is possible to realize a wind tunnel test without supporting interference. The wind tunnel model 1 is equipped with a magnetized material, a coil such as a superconducting coil that continues to flow current, or a magnet body composed of a permanent magnet or the like. A magnetic force is generated in the magnet body of the wind tunnel model 1 by a magnetic action with an external magnetic field generated by passing an electric current through a coil arranged around the measurement part of the wind tunnel, and the wind tunnel model 1 is magnetically levitated and supported. You can The external magnetic field is generated by the coils 23 to 26, the two magnetic circuits 21 and 22 including the coils 27 to 30, and the air core coil 3 on the outside thereof.
The magnetic circuit 2 is controlled by adjusting the currents generated by
It is possible to continuously change the strength and direction of the magnetic field in the y-z plane in 1, 2 and their rate of change in the x-axis direction. In addition, the rate of change in the strength of the magnetic field in the x-axis direction viewed in the x-axis direction can be controlled by adjusting the currents flowing in the air-core coils 31 and 32, which makes it possible to control five axes.

The wind tunnel includes a wind tunnel model 1 and coils 23 to 32.
In addition, a power supply system that drives each coil, a measurement system that measures the position and orientation of the wind tunnel model 1 (the measurement device 3 shown in FIG.
6), a control system for controlling the position and posture of the wind tunnel model 1 is incorporated. As shown in FIG. 4, the measurement data regarding the position and orientation of the wind tunnel model 1 detected by the camera 33, which is a measurement system, is transmitted to the computer 34 such as a personal computer, and the computer 3
After the calculation result of 4 is amplified by the amplifier 35, the controlled drive current is passed through the coils 23 to 32.

The wind tunnel model 1 shown in FIG. 1 is provided with a transparent resin outer body 2 and a mark body 3 mounted in the outer body 2. In this example, the wind tunnel model 1 is formed as a spherical model. The transparent resin forming the outer shape body 2 is, for example, polyethylene, polypropylene, acrylic resin, or the like.
Any material that is transparent and has an appropriate strength may be used. These resins are formed in a thin shell shape by an appropriate molding means such as blow molding or embossing. By forming the outer shape body 2 in a thin shell shape, the amount of resin used for the outer shape body 2 is reduced, which is advantageous in terms of manufacturing cost. Have contributed.

The wind tunnel model 1 includes a magnetic force supporting balance device 2
It comprises a magnet body 4 consisting of a cylindrical magnet which has a magnetic interaction with a magnetic field from zero. The mark body 3 is configured by attaching a mark 5 for optical measurement to a central position on the surface of the magnet body 4. The mark 5 is formed by surface painting,
The present invention is not limited to this, and any structure such as tape sticking may be adopted as long as the installation location does not shift and damage or dirt does not easily occur. Since the outer shape body 2 is made of a transparent resin, it is possible to optically detect the mark through the outer shape body 2 from the outside, and the position of the wind tunnel model 1 can be determined based on the measurement data thus obtained. And posture can be measured with high accuracy.

In this embodiment, the outer body 2 is formed by making two halves 2a and 2b each made of a hemispherical shell and joining them with an adhesive. Halved 2
In the a, 2b state, the mark body 3 is housed inside, and both end portions 3a, 3b of the mark body 3 are halved 2a, 2b, respectively.
The model 1 is manufactured by being integrally attached to b.

FIG. 2 is a perspective view showing another embodiment of the wind tunnel model according to the present invention. The wind tunnel model 11 shown in FIG.
It is a cylindrical model. The wind tunnel model 11 includes an outer body 12 and a mark body 13 housed in the outer body 12 and integrally attached to the outer body 12. The outer shape body 12 includes a cylindrical portion 16 made of a transparent resin and disc portions 17 at both ends.
a, 15b, each part is manufactured separately as a three-piece, or one disk part 17a is molded at the same time as the cylindrical part 16 by two-piece molding like drawing.
The mark body 13 is composed of a cylindrical magnet 14 and a mark 15 attached to the central portion of the surface thereof. If the size of the outer body 12 is matched, the mark body 3 is completely different from the mark body 3 used in the previous embodiment. It can have the same structure. By using the mark body having the same structure, it is possible to use the mark body without newly manufacturing it, and in the calibration test, the data of the respective magnetic force and sensor calibration test performed in the previous embodiment is used as it is. It does not require re-calibration data.

In the above embodiment, the mark bodies 3 and 13 are
Although the marks 5, 15 were formed on the surface of the magnet bodies 4, 14 by means such as painting, the mark bodies 3, 1
3, such as an annular body that covers the magnet bodies 4 and 14,
It is also possible to manufacture it separately from and use it in combination with the magnet bodies 4 and 14. Also, mark body 3, 13
Are magnet bodies 4, 14 of several sizes or strengths of magnetic force.
As a combination with, it is preferable to modularize in advance. By modularizing, a suitable module is selected according to the size of the model, and the selected module is arranged inside the outer body 2, whereby the magnetic force supporting wind tunnel model can be easily manufactured.

[0021]

As described above, according to the wind tunnel model for magnetic force support according to the present invention, the outer body must be manufactured for each wind tunnel model, but the mark body is manufactured with compatibility. It is possible, and the mark body used in another wind tunnel model for supporting magnetic force can be used as it is. Therefore, it is not necessary to perform a mark forming operation such as painting for each magnetic force supporting wind tunnel model. In addition, for such a mark body, once the sensor calibration test and the magnetic force calibration test were performed and the data was saved, the mark body was used for a magnetic force supporting wind tunnel model having another outer shape body. Even if
Since those calibration test data are available,
It is not necessary to carry out a calibration test of the mark body for each magnetic field supporting wind tunnel model. As described above, according to the wind tunnel model for magnetic force support according to the present invention, it is not necessary to individually perform the mark formation and each calibration test, and the posture setting can be performed with high efficiency. It is possible to contribute to shortening of time and efficient operation.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic force supporting air wind tunnel model according to the present invention.

FIG. 2 is a perspective view showing another embodiment of the magnetic force supporting wind tunnel model according to the present invention.

FIG. 3 is a schematic view of a magnetic force supporting balance device using the magnetic force supporting wind tunnel model according to the present invention.

FIG. 4 is a conceptual diagram of a magnetic force supporting balance device.

[Explanation of symbols]

1 Wind tunnel model for magnetic support (spherical model) 11 Wind tunnel model for supporting magnetic force (cylindrical model) 2,12 external body 3,13 mark body 4,14 Magnet body (cylindrical magnet) 5,15 mark 20 Magnetic support balance device

Continuation of the front page (56) Reference JP 2000-346740 (JP, A) SAIKAI HEI 3-10239 (JP, U) Hideo Sawada, Takashi Kono, Tetsuya Kunimasa, 60cm Application of magnetic support device to low speed wind tunnel, Proceedings of the 31st Annual Meeting of the Aviation Society of Japan, Japan, Japan Aerospace Society, March 2000, 222-225 (58) Fields investigated (Int.Cl. ⁷ , DB name) G01M 9 / 06 G01B 11/00

Claims (4)

(57) [Claims] 1. A wind tunnel model comprising a magnet body which is used in a wind tunnel test using a wind tunnel equipped with a magnetic force supporting balance device and is floatably supported by a magnetic force acting between the magnetic force supporting balance device and the magnetic force supporting balance device. A wind tunnel model for supporting magnetic force, comprising: an outer body made of metal; and a mark body mounted inside the outer body and having a mark optically detectable through the outer body. 2. The wind tunnel model for magnetic force support according to claim 1, wherein the mark body is composed of the magnet body having the mark on its surface. 3. The wind tunnel model for magnetic force support according to claim 1, wherein the magnet body is a columnar magnet whose central axis is arranged along the front-rear axis of the wind tunnel model. 4. The wind tunnel model for magnetic force support according to claim 1, wherein the outer body is resin-molded into a thin shell shape.