JP2865969B2 - Wind tunnel test model support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-support strut type wind tunnel test model supporting apparatus for supporting and changing the angle of a model disposed in a wind path in a wind tunnel test.

[0002]

2. Description of the Related Art In a wind tunnel test , a strut type wind tunnel test model supporting apparatus is provided which supports a model in an air passage while the wind is passing through and allows the attitude angle of the model to be changed by operation from outside the air path. Conventional examples are shown in FIGS. FIG.
Is called a two-strut system, and the airflow 51
A front strut 53 is erected substantially at the center of the upper surface of a turntable 59 rotatably provided on the floor of the measurement section 50 of the air passage 60 through which the strut 53 passes , and penetrates the turntable 59 on the downstream side of the strut 53 , A rear strut 55 that can move up and down is provided, and one end of an arm 57 is pivotally attached to a lower end of the rear strut 55. The other end of the arm 57 is connected by a variable angle driving device 58 fixed to the lower surface of the turntable 59, and the rear strut 55 moves up and down by this driving .

[0003] The upper end of the front strut 53 measures the air force acting on the model 52 by a gas stream 51, is pivotally mounted on the model 52 through the balance not shown, the rear struts 55 are also in the same manner as the front strut 53 To the model 52. Further, the front strut 53 and the rear strut 55 are surrounded by a front strut cover 54 and a rear strut cover 56 each having a wing-shaped horizontal section , and the influence of the airflow acting on the front strut 53 and the rear strut 55 is reduced by the model. 52 as little as possible. Then, by moving the rear strut 55 up and down via the arm 57 by the variable angle driving device 58, the posture angle of the model 52 in the vertical plane of the fuselage ,
Or the rotation of the turntable 59 and the rear strut 5
The posture angle of the model, which can be set in combination with the vertical movement of No. 5, can be arbitrarily set during ventilation from outside the air path 60.

FIG. 4 shows a so- called single strut system, in which a turntable 59 provided on the floor of the measuring unit 50 is provided.
The downstream lower end side portion of the upper surface substantially struts 63 erected on the center, the lower end is pivotally mounted, parallel to bending actuator 65 substantially strut 63 is vertically. The upper end of the strut 63, its central portion is pivotally mounted, one end portion is connected to the model 52 through the balance and the other end pivotally attached to the rod upper end portion of the bending actuator 65 L
A link arm 64 is provided, and the upper end of the rod is moved up and down by expansion and contraction of the actuator 65 for changing the angle, and the link arm 64 is turned around a pivot point at the upper end of the strut 63 to be connected to one end of the link arm 64. The model 52 is deformed. In the figure, reference numeral 66 denotes a strut cover provided so as to integrally surround the strut 63 and the actuator 65 for changing the angle.

[0005]

Since the conventional wind tunnel test model supporting apparatus is constructed as described above, the two-strut type apparatus shown in FIG. since the attitude angle changing mechanism is more present in the air passage, and since the bending link mechanism is constituted by four-bar linkage, on which the large, in order to set the posture angle gave HenYurakaku ψ rotation of the turntable 59, both two of the front and rear struts birch 54, 56 become Rukoto receive a greater air flow 51 component,
The aerodynamic interference in which the airflow 51 acting on these affects the model 52 becomes extremely large. Also requires a model attachment portion of the two locations, but the notch of the model 52 becomes large, inevitably severe limitations in terms of the securing of the actual similarity of the model 52. These are often catastrophic defects in wind tunnel testing techniques.

[0006] due to the one strut system illustrated in FIG. 4, the strut 63 and the link arm 64, the link ah
Is configured by a deflection actuator 65 that drives the robot 64 , and geometrically, the attitude of the model 62 can be changed.
Since the variable angle actuator 65 is provided along with the strut 63, the strut cover 66 becomes large , and the aerodynamic interference becomes excessively larger than that shown in FIG. 3, and is particularly fatal in the case of a model attitude angle giving the yaw angle ψ. If you such cause trouble
There is . Further, when bending of the model attitude angle, the model 62 the whole move greatly in the vertical-longitudinal direction, problems will be caused such a problem in the reproducibility of the wind tunnel test results.

[0007] The present invention, in order to solve the problem of the above conventional apparatus, even when taking the HenYurakaku ψ of the model,
In order to reduce the aerodynamic interference that occurs in the model, the strut supporting the model can be made compact and small, and the model notch can be made as small as possible for mounting the model while maintaining the similarity of the actual model, and the model moves when the model is deflected. It is an object of the present invention to provide a wind tunnel test model support device capable of reducing the size.

[0008]

Therefore, the wind tunnel test model supporting apparatus of the present invention supports a model installed in a wind path under ventilation to measure aerodynamic characteristics, and also adjusts the attitude angle of the model. A wind tunnel test model support device to be changed, comprising: a strut comprising a dual axis of an inner axis and an outer axis, protruding from a wind tunnel wall to a measuring portion, and attaching the model to an upper end thereof;
An attitude-bending mechanism disposed between the upper ends of the outer shafts and configured to change the attitude angle of the model connected to one end thereof by a relative displacement between the two shafts; and at least one of the inner shaft and the outer shaft And a driving device for driving the two shafts to cause relative displacement between the two shafts. In addition, as the attitude changing mechanism, the inner shaft,
Link function that changes the attitude angle of the model by the relative displacement of the outer shaft
Link mechanism or inner shaft, outer shaft
Posture of the model via the sector gear that rotates due to relative displacement
It is possible to adopt a sector gear mechanism that changes the angle
preferable.

[0009]

The wind tunnel test model supporting device of the present invention has a double-tube structure with a strut for supporting and changing the angle of the model for measuring the aerodynamic characteristics by being installed in an air passage under ventilation with the above configuration. with, model support structure is simplified, the struts consist of the strut cover can support system into smaller ones, the support system can be extremely small effect on the model.

[0010] A posture changing mechanism provided between the upper ends of the inner shaft and the outer shaft of the strut is driven by the relative vertical displacement of the inner shaft and the outer shaft, and the model connected to one end of the posture changing mechanism is moved up and down. , by which is adapted to varying angular as a supporting point distribution can hardly move back and forth, to minimize the amount of time-varying angle model moves up and down, back and forth within the wind passage, the reproducibility of the wind tunnel test data, reliable improves. Further, the axial inner performing deformation of the model, by directly driven by the drive gear of the driving device one of the axes of the both axes relative displacement between the outer shaft, by which is adapted produce linear motion As compared with the driving of the conventional device by the combination of the driving mechanism and the link mechanism, the tilting drive can be performed in small steps with less play.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the wind tunnel test model support device of the present invention will be described below with reference to the drawings. FIG. 1 shows a wind tunnel test model of the present invention.
The link mechanism as the first embodiment of the mold supporting device is adopted.
A side view showing an embodiment 2 model for wind tunnel tests to be placed in the measuring unit 22 of the air passage within 21 <br/> airflow 1 flows, 3 is the measurement unit 2
The outer shaft 5 secured upright on the upper surface of the turntable 24 which constitutes the second floor, the internal arrangement turntable 24 of the outer shaft 5
And a strut 6 composed of an inner shaft 4 that moves up and down and a strut cover 6 surrounding the strut 3 and having a wing-shaped horizontal cross-sectional shape. In order to measure the aerodynamic load generated on the model 2, the front end of the link arm B8 is connected to the rear end of the balance 23 whose front end is connected and fixed to the model 2. The upper end of the inner shaft 4 is pivotally mounted to the front of the link arm B8. Further, the upper end of the outer shaft 5, the link arm A7 at the upper end, pivotally attached to the rear end of the link arm B8
Is pivotally mounted at its lower end. Further, the lower end of the inner shaft 4, at least for the bending of the model 2, its upper end is threaded through a length vertical movement, the screw is fixed to the drive unit on the lower surface of the turntable 24 The gear 25 is meshed with the drive gear 9 driven by 25. The apparatus of this embodiment, which is configured as described above, the air force acting on the model 2 is transmitted by being divided into an inner shaft 4 and the outer shaft 5 through the balance 3. Each of the inner shaft 4 and the outer shaft 5, constituted by link arms A7 and the link arm B8, posture bending machine
A pin mechanism is connected to the link mechanism as a frame, and the vertical movement of the inner shaft 4 causes the link mechanism to act by a relative displacement generated between the inner shaft 4 and the outer shaft 5, thereby changing the attitude angle of the model 2.
Thisゝa vertical movement of the inner shaft 4 is effected by a rack and pinion drive of the driving gear 9 constituting the driving device 25.

[0012] As a result, strut 3 struts is simplified, the support system comprising a strut cover 6 is miniaturized, the support system is to minimize the aerodynamic interference with the model, and,
Minimizes vertical and vertical movements of the model, enabling highly accurate and reliable wind tunnel tests. Further, since the vertical movement of the inner shaft 3 so as to perform by a rack and pinion drive, a backlash caused by the driving force transmission with can be reduced, fine adjustment of the vertical movement is facilitated, raise the posture angle accuracy of the model 2, the precision Wind tunnel test data can be obtained.

Next, FIG. 2 shows a wind tunnel test model supporting device of the present invention.
FIG. 13 is a side view showing an embodiment in which a sector gear mechanism is employed as a second embodiment of the present invention, wherein reference numeral 13 denotes an inner shaft 14 and an inner shaft 14 extending along the axis.
The strut 16 comprises a tubular outer shaft 15 which penetrates and moves up and down. A strut cover 16 constitutes a supporting system together with the strut 13. A screw 12 is provided at the upper end of the inner shaft 14.
And a drive gear 20 driven by a drive device 25 is fitted to the lower end. Further , the lower end is pivotally attached to the upper end of the outer shaft 15, two link arms A18 provided on the left and right sides, and one end is respectively pivotally attached to the upper end of the link arm A18. Two link arms B are provided which rotatably rotate a two-sector sector gear 17 having gears meshing with each other from both sides and pinch and support the sector gear 17 from both right and left sides. With rotation of the inner shaft 14 within the outer shaft 15,
The sector gear 17 screwed with the screw 12 engraved at the upper end of the inner shaft 14 rotates. Thus, model 2
Rotation of the inner shaft 14 as a posture changing mechanism that changes the posture angle of the
Model 2 using sector gear 17 that rotates with
The adoption of the sector gear mechanism that changes the angle of rotation allows the sector gear connected to the model 2 via the balance 23.
A, that is, the sector arranged on the left side of the screw 12
The gear 17 is located on the left side of the sector gear 17 and the screw 12.
The link arm A18 disposed on the
Rotate around a pivot point pivoted with a pin to
2 also changes the angle around the pivot point pivoted by the pin
You.

The link arm B19 is connected to the model 2
Screw 1 that rotates like sector gear 17
2 and one end of the sector gear 17 provided on the right side of the
Tag gear 17 and the other end connected to the outer shaft 15.
The link arm A18 provided on the right side of the
12 left sector gear 17 and screw 12 left link
Since the pivot point with the arm A18 is fixed, the pneumatic force acting on the model 2 causes the sector gear 17 screwed to the left side of the screw 12 via the balance 23 and the link arm pivotally attached to the link arm B19. A18, inner shaft 14, outer shaft 1
5 is transmitted. The sector gear 17 is driven by the rotation of the inner shaft 14, and this movement is pivoted at the pivot point between the link arm A18 and the link arm B19 provided on the left side of the screw 12.
The sector gear 17 provided on the left side of being threaded,
And the monitor gives the attitude angle change to the model 12, the inner shaft 14 is ne
A pair of sector gears 17 provided on the left and right sides of the
Since the sector gear 17 is sandwiched from both left and right sides by the link arm B, the model 12 is allowed to change its attitude angle freely, and the inner shaft 14 is sandwiched between the upstream and downstream sides.
And by being supported by the outer shaft 15, stable support can be achieved. Further, the link arm A18 supporting the sector gear 17 has a configuration in which the length between fulcrums can be adjusted to prevent backlash.

In the above configuration, the sector gear mechanism based on the relative displacement generated between the inner shaft 14 and the outer shaft 15 due to the rotational movement of the inner shaft 14 driven by the gear coupling drives the attitude angle of the model 2.
Since the posture changing mechanism is used, the movement is smooth and the turning angle can be changed in fine increments, and there is no place to generate backlash. Therefore, compared to the first embodiment, higher accuracy and higher reliability are achieved. Enables acquisition of certain wind tunnel test data.

[0016]

As described above in detail, according to the wind tunnel test model support apparatus of the present invention, the simple structure shown in the claims is adopted. (1) The model support is made up of the double shaft of the inner shaft and the outer shaft. Since it is possible to use a single-strut having a shaft structure, the model can be easily supported in the air passage, and the influence of the support on the model can be extremely reduced. Depending on the purpose of the wind tunnel test, it is possible to make the thickness of the support part extremely thin in combination with the aerodynamic force, so that the range of application is wide. (2) By using a single-supported strut as a multi-axis, a. Structure to enable miniaturization of the support unit is compact, yet can promote the effect of the (1).

B. As a driving method for the attitude angle change of the model, it is possible to easily deal with both the linear or rotational movement of the inner shaft. (3) model attitude angle change even less link the movement of the bending fulcrum
By adopting a posture changing mechanism using a mechanism or a sector gear mechanism , a. Since the can up and down, back-and-forth movement of the model at the time of the model attitude variable angle to the minimum, which contributes to improved reproducibility of wind tunnel tests.

B. The structure is compact and the notch of the model can be made small, so that it is easy to secure high similarity of the model to the actual machine. (4) In addition, by using a gear drive as the drive system of the attitude changing mechanism , a. Eliminate the vertical and vertical movement of the model when changing the model posture,
Or it can be reduced , and the reproducibility of the wind tunnel test is improved.

B. The structure is compact, the notch of the model can be reduced , and the similarity between the actual machine and the model can be increased.

C. Because of the gear drive, the change of the minute step is reliable and the backlash is small , so that it is possible to acquire the wind tunnel test data with high reliability. And the like.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of a wind tunnel test model support device of the present invention.

FIG. 2 is a side view showing a second embodiment of the device of the present invention.

FIG. 3 is a side view showing a conventional two-strut type wind tunnel test model support.

FIG. 4 is a side view showing a conventional one-strut type wind tunnel test model support.

[Explanation of symbols]

 1,51 Air flow 2,52 Model 3 Strut 4,14 Inner shaft 5,15 Outer shaft 6,16 Strut cover 17 Sector gear 7,18 Link arm A 8,19 Link arm B 9,20 Drive gear 21,60 Air passage 22 Measuring unit 23 Balance 24 Turntable 25 Drive unit 53 Front strut 54 Front strut cover 55 Rear strut 56 Rear strut cover 57 Arm 58 (Erase angle) drive device 59 Turntable 63 Strut 64 Link arm 65 Actuator for angle change 66 Strut cover

Claims (1)

(57) [Claims] 1. A wind tunnel test model supporting apparatus for supporting a model installed in an air passage through which air flows to measure aerodynamic characteristics and changing an attitude angle of the model, wherein a double shaft of an inner shaft and an outer shaft is provided. A strut comprising a shaft, projecting from the wall of the wind tunnel to the measuring portion, and attaching the model to the upper end thereof; and the strut disposed between the upper ends of the inner shaft and the outer shaft, and connected to one end thereof by relative displacement between the two shafts. An attitude change mechanism that changes the attitude angle of the
A wind tunnel test model supporting device, comprising: a driving device that drives at least one of the inner shaft and the outer shaft to cause relative displacement between the two shafts.