JP2721782B2 - Wind tunnel test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind tunnel test apparatus applied to a helicopter rotor or the like.

[0002]

2. Description of the Related Art FIG. 4 is an explanatory view of a conventional wind tunnel test apparatus used for a helicopter rotor or the like. In the drawing, in the wind tunnel test apparatus, the rotation of a motor 1 is transmitted to a rotor shaft 3 via a speed reducer 2 to rotate a rotor blade of a helicopter (not shown). The force and moment acting on the rotor shaft 3 by the rotor blades are transferred to the roll frame 22.
The measurement is transmitted to the balance 9 via the. When the rotor shaft 3 rotates, the vibration generated by the rotor blades resonates with the balance 9 and hinders the measurement by the balance 9, so that a vibration absorbing device is used as a countermeasure.

The vibration absorbing device is placed between the speed reducer 2 and the balance 9, and changes the stiffness of the pitch spring 20 and the roll spring 21 to change the resonance point of the balance block 8, thereby reducing the influence of vibration and reducing the balance. 9 facilitates the measurement. The pitch spring 21 is used to adjust the vertical vibration.
Is used, and a roll spring 20 is used to adjust the vibration in the rotation direction.
Is used. The roll spring 20 is protected in the vertical direction by a roll frame 22 via a bearing 23, and has a degree of freedom in the rotational direction by the bearing 23. When the resonance point is changed using these springs, the spring constant is adjusted while performing not only calculations but also actual tests. In the figure, reference numeral 10 denotes a support portion, 12 denotes a shaft bearing, 24
Is a taper pin, 25 is a pitch axis pin, and 26 is a torque tube.

[0004]

In the above-described conventional wind tunnel test apparatus, two types of springs are required because the hinge surface of the vibration absorbing device is different for each vibration direction. The spring constant in the direction cannot be adjusted. In addition, since the structure of the vibration absorbing device is complicated as described above, it takes time and effort to disassemble and assemble when adjusting the spring constant.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wind tunnel test apparatus for rotating a rotor shaft by a motor and measuring the force and moment acting on the rotor shaft by the load on the rotor shaft. In the wind tunnel test apparatus for measuring and transmitting to the rotor shaft, the rotor is engaged with the rotor shaft, and is swingably and rotatably supported.
The force and moment acting on the motor shaft are
, A spring having one end connected to the shaft, and a spring supporting portion that changes the rigidity of the spring by supporting the spring such that the support point can be changed.

[0006]

In the wind tunnel test apparatus according to the present invention,
The rotor is engaged with the rotor shaft in a wind tunnel test apparatus that measures the force and moment acting on the rotor shaft by the load of the rotor shaft by transmitting the force and moment to the balance by the motor, and is supported swingably and rotatably.
Transfer the forces and moments acting on the shaft to the balance
The rigidity of the spring is changed by supporting the spring with one end connected to the shaft at the spring support part and changing the supporting point, so that the vibration caused by the load when the rotor shaft rotates and the resonance with the balance are reduced. In this case, by changing the support points of the springs and changing the rigidity of one spring,
The structure of the vibration absorbing device is simplified, for example, the spring constant in the direction is adjusted to change the resonance point of the balance.

[0007]

1 to 3 are explanatory views of a wind tunnel test apparatus according to one embodiment of the present invention. In the figure, a wind tunnel test apparatus according to the present embodiment is used for a helicopter rotor or the like. As shown in FIG. 1, the rotation of a motor 1 is transmitted to a rotor shaft 3 via a reduction gear 2 and a Turn the blade. The force and moment acting on the rotor shaft 3 by the rotor blades are transmitted to the hinge frame 4.
The measurement is transmitted to the balance 9 via the. When the rotor shaft 3 rotates, the vibration generated by the rotor blades resonates with the balance 9 and hinders the measurement by the balance 9, so that a vibration absorbing device is used as a countermeasure.

The vibration absorbing device is placed between the speed reducer 2 and the balance 9, and changes the resonance point of the balance block 8 by changing the rigidity of the plate-like spring 6 to reduce the influence of vibration to reduce the influence of vibration. Makes measurement easier. Hinge frame 4 is shaft 1
1 is attached to the speed reducer 2. The other end of the shaft 11 is connected to a spring 6. The spring 6 is attached to a balance block 8 via a frame support 5 and a movable spring support 7, and applies a force and a moment acting on the rotor shaft 3. The information is transmitted to the balance 9. The balance 9 has a support 10
Through a support device (not shown) such as a wind tunnel main body.

[0009] As shown in FIG.
2, the inner frame 13 is supported by an outer frame 14 by upper and lower pins 15 and bearings 16, and the outer frame 14 is supported by left and right pins 15 and bearings 16. It is attached to the frame support 5. Although the pin 15 is attached to the outer frame 14 by the bolt 17, a play gap is generated depending on how the bearing 16 is pressed. Therefore, the contact state is adjusted by changing the thickness of the adjusting plate 18. The spring 6 may be coil-shaped instead of plate-shaped. 3 (a), the shaft 11 and the frame support 5 may be provided on the same side of the hinge frame 4 as the speed reducer 2.
The position of the spring 6 is free as long as the spring 6 is located between them. Also, a spring 19 is used in place of the adjusting plate 18 to adjust the gap between the pin 15 and the bearing 16 in the hinge frame 4 as shown in FIG. You may be made to join during.

In the conventional wind tunnel test apparatus, two kinds of springs are required because the hinge surface of the vibration absorbing apparatus is different for each vibration direction, and the spring constant in three directions cannot be adjusted because there is only a biaxial spring. . Also, since in this way is complicated structure of the vibration absorber, decomposing at when adjusting the spring constant, but Cal labor and time expense for assembly, rocking the hinge frame 4 projecting from the reduction gear 2 is in the wind tunnel test apparatus Movement and
One plate-like spring 6 is mounted on a shaft 11 rotatably supported.
And the other end of the spring 6 is fixed by a movable spring support 7, and the hinge frame 4 is connected to the frame support 5.
, And the spring 6 is attached to the balance block 8 via a spring support 7. The hinge frame 4 is located on the supporting point in a plane of the rotatable shaft 11, together with the shaft 11 can freely rotate by the shaft bearing 12, the left-right direction
The upper and lower pins 15 and bearings 16 allow the upper and lower pins 15 and bearings 16 to freely swing vertically. The spring constant in three directions can be adjusted by one spring 6 in the plane.
By simply inserting the hinge pin 15 between the outer frame 14 and the inner frame 13, the outer frame 14 and the inner frame 13 can be freely formed in a circular or rectangular shape, and the structure is simple. .
The distal end of the spring 6 is fixed by a movable spring support portion 7 so that the rigidity can be easily adjusted. By moving the spring support portion 7 in the axial direction of the spring 6, fine adjustment of the spring constant is easy. is there. Further, the spring 6 is outside the hinge frame 4 and can be easily disassembled, assembled, and the like.

[0011]

The wind tunnel test apparatus according to the present invention is constructed as described above. By changing the stiffness of one spring, the spring constants in three directions are simultaneously adjusted to change the resonance point of the balance. Since the structure of the device is simple, disassembly and assembly when adjusting the spring constant are easy.

[Brief description of the drawings]

FIG. 1 is a front view of a vibration damping device of a wind tunnel test device according to one embodiment of the present invention.

2A is a sectional view of the hinge frame, FIG. 2B is a sectional view taken along line bb in FIG. 2A, and FIG.
2 is a sectional view of a main part in FIG.

FIG. 3A is a front view of a vibration absorber of a wind tunnel test apparatus according to an application example of the above embodiment, and FIG. 3B is a cross-sectional view of a main part thereof.

FIG. 4 is a cross-sectional view of a vibration absorber of a conventional wind tunnel test device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Reduction gear 3 Rotor shaft 4 Hinge frame 5 Frame support part 6 Plate-like spring 7 Spring support part 8 Balance block 9 Balance 10 Support part 11 Shaft 12 Shaft bearing 13 Inner frame 14 Outer frame 15 Pin 16 Bearing 17 Bolt 18 Adjusting plate 19 Spring

Claims (1)

(57) [Claims] 1. A wind tunnel test apparatus for measuring convey the balance of the forces and moments acting on the rotor shaft with the load on the rotor shaft by turning the rotor shaft by the motor, Oyo engaged swings the rotor shaft
And act on the rotor shaft
An axis that transmits force and moment to the balance,
A wind tunnel test apparatus comprising: a spring having one end connected thereto; and a spring supporting portion that supports the spring so as to change a support point and changes the rigidity of the spring.