KR101482778B1 - Tortion generation apparatus to fatigue testing of a blade and A fatigue testing method using the apparatus - Google Patents

Abstract

A torsion generation apparatus for testing blade fatigue according to the present invention comprises a seating unit including a seating part having a seating recess with a shape corresponding to the surface of a blade and a coupling part positioned outside the seating part and coupled by a coupling member to make the seating part apply a pressure to the blade; a power generator alternately generating rotational forces in a normal direction and in a reverse direction; a rotational guide separated to be rotatable at a set position of an upper side of the blade; a force transmission member transmitting the rotational forces of the power generator to the coupling part; a torsion inducing member inducing a torsion motion of the blade by restricting a left/right and an upper/lower motion of the blade via a link with the rotational guide when the blade moves by the rotational forces transmitted to the coupling part; an acoustic emission diagnosing unit sensing an acoustic emission signal generated when the blade performs a torsion motion to diagnose defects; and a control board controlling operations of the power generator and the acoustic emission diagnosing unit.

Description

[0001] The present invention relates to a torsion generating device for blade fatigue test, and a fatigue test method using the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsion generating device for a blade fatigue test capable of performing a fatigue test by applying a tortion to a blade and a fatigue test method using the same, and more particularly, The present invention relates to a torsion generating device for a blade fatigue test and a fatigue test method using the torsion stress generating device.

The present invention relates to a torsion generating device for a blade fatigue test, which is capable of evaluating the health of a blade in real time through an acoustic emission signal generated in fatigue test of a blade equipped with acoustic emission diagnosis means, and a fatigue test method using the same.

The blades used in wind power generation are used to obtain the rotational power required to rotate an electric motor for generating electric power. The blades used in a rotor blade aircraft cause the aircraft to generate lift, thrust, .

The rotation of the blade causes a change in the aerodynamic distribution around the blade, and this phenomenon acts on the blade itself as a bending load and a torsional load.

Aerodynamic load monitoring for safe operation of the blades and a device for measuring aerodynamic loads are needed to measure the aerodynamic distribution in the radial direction of the blades.

Also, resonance generators for generating aerodynamic loads have been developed in various forms.

For example, Korean Patent Laid-Open Publication No. 10-2011-0078999 includes a calibrator 40 as an arrangement of a measuring device for measuring an aerodynamic load as shown in Fig. 1 attached hereto.

The calibrator (40) is provided with a plurality of rings (41, 42, 43, 44) on which weights are installed, and a space (45) into which the blades can be fitted is formed.

However, the calibrator 40 configured as described above is not suitable for the torsional fatigue test because it connects the ends of the wires to the rings 41, 42, 43, and 44 and then repeatedly applies a tensile force to measure the aerodynamic load.

International Publication No. WO2009 / 135136 discloses a system 1 in which a resonance test of a blade 2 is made possible by using an actuator 10, 20, 30 which reciprocates linearly as shown in Fig.

However, the above-described technique not only requires a great deal of cost to construct the system 1 for the resonance test of the blade 2, but also has a problem that the resonance frequency is lowered because the root is out of the condition of the cantilever beam which is clamped.

Also, resonance can occur in the flap and edge directions of the blade, but it is difficult to generate a torsional stress.

FIG. 3 schematically shows a fatigue testing equipment developed by the National Renewable Energy Laboratory (NREL) in the United States. The frame 7 is provided on the upper surface of the blade, and the frame 7 is provided with a linear reciprocating An actuator 5 for moving the actuator 5, and a structure in which the weight 6 is hung on the lower end of the actuator 5 to swing the blade in the up / down direction.

FIG. 4 is a schematic diagram showing another fatigue testing equipment developed by the National Renewable Energy Laboratory (NREL) in the United States. Each of the left and right side actuators 8 is provided with the actuator 8, Direction to generate an amplitude.

5 shows a UREX system developed by MTS. The UREX system is mounted with the actuator A on both sides of the blade seating portion P and the additional mass W is additionally mounted on the actuator A in the width direction of the blade B in the code direction.

However, all of the prior arts disclosed in Figs. 3 to 5 have a structure capable of generating resonance only in the up / down direction, and no structure capable of generating torsion is disclosed.

The fatigue test of the blade is repeated several hundreds of times in the flap direction, and then the edge test is carried out or the static test is performed.

As a result, the blade is in a state of being damaged during the test in the flap direction, so that it is difficult to obtain an accurate test result even if the edge test or static test is performed.

SUMMARY OF THE INVENTION The object of the present invention is to solve the problems of the prior art as described above, and it is an object of the present invention to provide an apparatus and a method for rotating a blade, And to provide a fatigue test method using the same.

Another object of the present invention is to provide a torsion generating device for a blade fatigue test capable of evaluating the health of a blade in real time through an acoustic emission signal generated in a fatigue test of a blade equipped with acoustic emission diagnosis means and a fatigue test method using the same .

A torsion generating device for a blade fatigue test according to the present invention comprises: a seat portion provided with a seating groove having a shape corresponding to an outer surface of a blade; and a torsion spring portion coupled to the seat portion by a coupling member, A seating means composed of an engaging portion; A power transmitting member for transmitting a rotational force of the power generator to a coupling portion; a power transmitting member for transmitting a rotational force of the power generator to a coupling portion; A torsion inducing member for inducing a torsional movement of the blade by restricting the left / right and upward / downward movement of the blade in cooperation with the rotation guide when the blade moves by the transmitted rotational force; An acoustic emission diagnostic device for diagnosing a defect by sensing an acoustic emission signal, and a control panel for controlling the operation of the power generator and the acoustic emission diagnostic device.

Wherein the power generator and the force transmitting member are located on the same vertical line.

And the force transmitting member and the torsion inducing member are simultaneously moved by the same length during operation of the power generator.

The acoustic emission diagnostic device may include an acoustic emission signal sensor attached to one side of the blade to sense an acoustic emission signal and a signal processing unit for processing the acoustic emission signal sensed by the acoustic emission signal sensor.

And the signal processing unit converts an acoustic emission signal sensed by the acoustic emission signal sensor into an acoustic emission parameter and displays the acoustic emission signal.

A fatigue test method using a torsion generating device for blade fatigue test according to the present invention is characterized in that a fatigue test method using a torsion generating device for a blade fatigue test comprises a seating means seated to apply pressure to the blade, a power generator generating a rotational force, a rotation guide rotatably spaced apart from the blade, A force transmitting member for transmitting the rotational force of the power generator to the engaging portion, and a torsion inducing member for restricting the left / right and upward / downward movement of the blade in cooperation with the rotation guide when the blade is moved by the rotational force transmitted to the engaging portion. A preparation step of preparing an acoustic emission diagnostic device for diagnosing a defect by sensing an acoustic emission signal generated when the blade is twisted; an operation step of generating a twist in the blade by operating the power generator; A sensing step of sensing an acoustic emission signal through an acoustic emission diagnostic device when a twist occurs, And a display showing the attitude from No. AE variable phase, characterized by comprising a diagnostic step of diagnosing the degree of fatigue of the blade through the variable acoustic emission.

The preparing step is a step of positioning the power generator and the force transmitting member on the same vertical line.

Wherein the operation step is a step in which the force transmitting member and the torsion inducing member simultaneously move by the same length during the operation of the power generator.

According to the present invention configured as described above, it is possible to repeatedly generate torsional stress in the blades by alternately providing rotational forces in the forward and reverse directions to the mounting means fixed around the outer surface of the blades.

Therefore, the torsional fatigue test for the blade can be performed with a simple structure, which can reduce the cost, reduce the investment cost, and improve the usability.

In the present invention, the acoustic emission diagnostic means is provided to continuously diagnose the acoustic emission signal generated during the fatigue test of the blade.

Therefore, the health of the blade can be evaluated in real time, and the propensity to increase the fatigue can be grasped by the number of twists. Thus, the blade can be evaluated more precisely.

1 is a perspective view showing the configuration of a calibrator attached to Korean Patent Laid-Open Publication No. 10-2011-0078999.
2 is a schematic diagram of the resonance test system disclosed in International Publication No. WO2009 / 135136.
3 is a schematic view showing a fatigue testing equipment developed by the National Renewable Energy Laboratory (NREL) in the United States;
FIG. 4 is a schematic view showing another fatigue testing apparatus developed by the National Renewable Energy Laboratory (NREL) in the United States; FIG.
5 is a schematic diagram showing a UREX system developed by MTS.
6 is a perspective view showing the installation state of the twist generating apparatus for blade fatigue test according to the present invention.
7 is a front view showing a configuration of a twist generating apparatus for blade fatigue test according to the present invention.
8 is a flowchart showing a fatigue test method using a torsion generating device for blade fatigue test according to the present invention.
9 is a front view showing a state of the blade when the torsion generating apparatus for blade fatigue test according to the present invention is operated.

Hereinafter, the use state of the twist generating apparatus for blade fatigue test according to the present invention (hereinafter referred to as " twist generating apparatus 100 ") will be described with reference to FIG.

Fig. 6 is a perspective view showing the installation state of the torsion generating device 100 for blade fatigue test according to the present invention.

Prior to this, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may appropriately define the concept of the term in order to describe its invention in the best possible way It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

As shown in the drawing, the torsion generating apparatus 100 according to the present invention is a device capable of performing the fatigue test of the blade B by sensing sound generated after twisting the blade B to be tested.

The torsion generating device 100 includes a seating unit 110 seated on and coupled to the outer surface of the blade B, a power generator 120 generating a rotating power from the lower side of the blade B, A force transmitting member 140 for transmitting the rotational force of the power generator 120 to the seating means 110 and a force transmitting member 140 for transmitting the rotational force of the power generator 120 to the seating means 110, A torsion inducing member (not shown) for inducing a torsional movement of the blade B by restricting the left / right and upward / downward movement of the blade B in cooperation with the rotation guide 130 when the blade B is moved by the rotational force An acoustic emission diagnostic unit 160 for detecting an acoustic emission signal generated when the blade B is twisted to diagnose a defect and an operation of the acoustic emission diagnostic unit 160 and the power generator 120 And a control panel (170) for controlling the control panel (170).

The mounting means 110 is provided for receiving the rotational power generated in operation of the power generator 120 and transmitting the rotational power to the blade B. The force transmitting member 140 is coupled to the left / And a torsion inducing member 150 is coupled to the right side.

7, the seating unit 110 includes a seating part 112 having a seating groove having a shape corresponding to the outer surface of the blade B, and a seating part 112 located outside the seating part 112, And a coupling portion 114 for coupling the seating portion 112 to the blade B to apply pressure thereto.

Accordingly, the force transmitting member 140 and the torsion inducing member 150 are coupled and fixed to the upper / lower left / right ends of the coupling portion 114.

The power generator 120 generates rotational power when a power source is applied. The power generator 120 repeatedly performs forward rotation and reverse rotation within a predetermined angle range so as to generate a tortion in the blade B.

The rotation axis of the power generator 120 is disposed in the same direction as the longitudinal direction of the blade B so that the rotational force generated by the power generator 120 can be distorted only in the blade B.

The rotation guide 130 is configured to be freely rotatable in a state of being separated from the upper side of the blade B so as to guide the torsion induction member 150 to move freely.

The rotation guide 130 is disposed on the same vertical line as the rotation axis of the power generator 120 and is interlocked with the power generator 120, the force transmitting member 140, and the torsion guide member 150.

The torsion guide member 150 is disposed on the upper outer peripheral surface of the rotation guide 130 and both ends of the torsion guide member 150 are fixed to the left and right sides of the upper surface of the mounting means 110 to have a tension .

The force transmitting member 140 is fixed to the left / right side of the lower surface of the seating means 110 in a state where both ends are surrounded by the lower outer peripheral surface of the power generator 120 and have a tension.

The torsion inducing member 150 and the force transmitting member 140 are surrounded by the rotation guide 130 and the power generator 120 so as to prevent slippage, respectively.

Accordingly, the torsion inducing member 150 and the force transmitting member 140 can be applied to various materials such as a chain, a belt, and the like.

An acoustic emission diagnostic device 160 is provided on the upper surface of the blade B. The acoustic emission diagnosis unit 160 is configured to detect an acoustic emission signal generated when the blade B is twisted to diagnose a defect. As shown in FIG. 7, a plurality of the acoustic emission diagnostic units 160 are provided on the outer surface of the blade B, And is configured to allow the test supervisor to visually confirm such an acoustic emission signal by transmitting the acoustic emission signal to the control panel 170 as an acoustic emission parameter.

A fatigue test method using the torsion generating device 100 will be described with reference to FIG.

8 is a flowchart showing a fatigue test method using the torsion generating device 100 for fatigue testing of the blade (B) according to the present invention.

As shown in the drawing, the fatigue testing method using the torsion generating apparatus 100 includes a mounting unit 110, a power generator 120, a rotation guide 130, a force transmitting member 140, a torsion induction member A step S100 of preparing the acoustic emission diagnosis unit 160 and an operation step S200 of generating a twist in the blade B by operating the power generator 120, (S300) for detecting an acoustic emission signal through an acoustic emission diagnostic unit (160) when a torsion occurs in the display unit (400); a display step (S400) for displaying the sensed acoustic emission signal as an acoustic emission parameter; (S500) for diagnosing the fatigue of the vehicle.

6, the mounting means 110 is mounted on the outer surface of the blade B and the torsion induction member 150 and the force transmission member (not shown) are mounted on the left / 140 and the torsion inducing member 150 and the force transmitting member 140 are disposed to surround the power generator 120 or the rotation guide 130.

The acoustic emission diagnosis unit 160 maintains a state of being attached to the outer surface of the blade B and the control panel 170 controls the operation of the power generator 120 and the acoustic emission diagnosis unit 160 to be.

At this time, the power generator 120 and the force transmitting member 140 should have their rotation centers on the same vertical line.

When the preparing step S100 is completed, the power generator 120 is operated to move the force transmitting member 140 and the torsion inducing member 150 by the same length (operation step S200)

For example, when the power generator 120 is rotated clockwise in the state shown in FIG. 8, the blade B is twisted as shown in FIG.

On the contrary, when the rotation direction of the power generator 120 is reversed, the twist direction of the blade B is reversed. The operation step S200 is a process of regularly generating clockwise and counterclockwise rotations of the blade B. The rotation angle, the rotation direction and the rotation speed of the power generator 120 are controlled by the control panel 170 And is carried out for a long time.

The sensing step S300 is performed simultaneously with the operation S200, and preferably is continuously performed during the operation S200.

The sound emission signal sensed in the sensing step S300 is sent to the control panel 170 to be converted into sound emission parameters and can be visually confirmed through a display (not shown) provided in the control panel 170. [

Then, the diagnostic step S500 is performed through the acoustic emission parameters to be displayed.

The scope of the present invention is not limited to the above-described embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the scope of the present invention.

For example, in the embodiment of the present invention, the operation of the power generator 120 is controlled by the control panel 170. However, if necessary, the detection sensor or the like may be disposed on the left / right side of the blade B, The rotation direction of the power generator 120 may be switched when the detection unit B detects the rotation.

100. Torsion generating device for blade fatigue test 110. Mounting means
112. Seat part 114. Coupling part
120. Power generator 130. Rotary guide
140. Force transmitting member 150. Torsion guiding member
160. Acoustic Emission Diagnosis Device 170. Control Panel
B. Blade S100. Preparation phase
S200. Operation step S300. Detection phase
S400. Display step S500. Diagnostic phase

Claims (8)

delete A seating part provided with a seating groove having a shape corresponding to an outer surface of the blade, and a coupling part located on the outer side of the seating part and coupled by a coupling member so that the seating part applies pressure to the blade,
A power generator that alternately generates forward and reverse rotational forces in a state spaced apart from a lower side of the blade;
A rotation guide positioned on the same vertical line as the power generator and rotatably spaced apart from the blade at a predetermined position,
A force transmitting member for transmitting the rotational force of the power generator to the lower left / right side of the engaging portion,
A torsion inducing member for guiding a torsional movement of the blade by restricting the left / right and upward / downward movement of the blade in cooperation with the rotation guide when the blade moves by the rotational force transmitted to the coupling portion;
An acoustic emission diagnostic device for diagnosing a defect by sensing an acoustic emission signal generated when the blade is twisted;
And a control panel for controlling operations of the power generator and the acoustic emission diagnostic device.
3. The apparatus of claim 2, wherein the force transfer member and the torsion guide member are simultaneously moved by the same length during operation of the power generator.
The sound emission diagnosis system according to claim 3,
An acoustic emission signal sensor attached to one side of the blade for sensing an acoustic emission signal,
And a signal processing unit for processing the acoustic emission signal sensed by the acoustic emission signal sensor.
The signal processing apparatus according to claim 4,
And converting the acoustic emission signal sensed by the acoustic emission signal sensor into an acoustic emission parameter and displaying the acoustic emission signal.
delete A power generator that is alternately generated in forward and reverse directions in a state of being spaced apart from the lower side of the blade; and a power generator positioned on the same vertical line as the power generator, A force transmitting member for transmitting the rotational force of the power generator to the lower left / right side of the seating means, and a force transmitting member for rotating the blade when the blade is in motion with the rotation guide A torsion inducing member for inducing a torsional movement of the blade by restricting the left / right and upward / downward movement of the blade, and an acoustic emission diagnostic device for diagnosing a defect by sensing an acoustic emission signal generated when the blade is twisted Preparatory preparatory steps,
An operation step of operating the power generator to generate a twist in the blade,
A sensing step of sensing an acoustic emission signal through the acoustic emission diagnostic device when the twist occurs in the blade,
A display step of displaying the sensed acoustic emission signal as an acoustic emission variable;
And a diagnostic step of diagnosing the fatigue of the blade through the acoustic emission parameter.
8. The method according to claim 7,
Wherein the force transmitting member and the torsion inducing member are simultaneously moved by the same length during operation of the power generator.

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