Fatigue test auxiliary device for wind generating set blade optical fiber

Abstract

The utility model discloses a wind generating set blade optical fiber fatigue test auxiliary device which comprises a base, a clamp, a slider-crank mechanism, an optical fiber load sensor and a power source, one end of a glass fiber reinforced plastic sample piece of a blade is fixed on the base through the clamp, and the other end of the glass fiber reinforced plastic sample piece is connected with one end of the slider-crank mechanism. One end of the slider-crank mechanism is connected with the optical fiber load sensor, the other end of the slider-crank mechanism is connected with the power source, the optical fiber load sensor is adhered to the surface of a glass fiber reinforced plastic sample piece through a structural adhesive, and the power source drives the slider-crank mechanism to do linear reciprocating motion, so that a fatigue test environment in a blade vibration state is simulated. According to the utility model, a fatigue test environment in a blade vibration state can be truly simulated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of wind turbine blade optical fiber fatigue test, especially to a kind of wind turbine blade optical fiber fatigue test auxiliary device. BACKGROUND

[0002] With its excellent corrosion resistance, strong anti-electromagnetic interference ability and advanced technology for quasi-distributed measurement of large structures, the optical fiber load sensor has become a key technology in the field of wind turbine blade structural state monitoring. The sensor can accurately monitor the bending moment of wind turbine blades in the flapwise and edgewise directions, and plays an indispensable role in promoting the design transformation of wind turbine blades towards large-scale, lightweight and intelligentization. However, the widespread application of optical fiber load sensors in the wind power industry still faces some technical challenges, especially the problem of fatigue damage under long-term large-strain alternating loads. This problem may become a major factor limiting the reliability and durability of optical fiber sensors. Therefore, in order to fully exploit the application potential of optical fiber load sensors in the wind power field, it is crucial to conduct in-depth research on their fatigue characteristics and perform rigorous testing.

[0003] According to the IEC standard and GB / T 15972.33, the axial tension method and the two-point bending method are the two main methods for testing the dynamic fatigue parameters of optical fiber load sensors. In experiments, optical fiber load sensors are usually fixed using mechanical clamping, and structures such as V-grooves and magnetic blocks are used to stabilize the bare optical fiber and the cylinder. However, this method cannot truly simulate the fatigue test environment under blade vibration conditions, resulting in low optical fiber strain transmission efficiency and low accuracy of sensor monitoring. SUMMARY

[0004] The utility model aims at overcoming the defects of prior art, providing a kind of wind turbine blade optical fiber fatigue test auxiliary device, can truly simulate the fatigue test environment under blade vibration conditions.

[0005] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0006] A kind of wind turbine blade optical fiber fatigue test auxiliary device, including base, clamp, crank slider mechanism, optical fiber load sensor and power source, the glass steel sample of the blade one end is fixed on base by clamp, its other end is connected with the one end of crank slider mechanism, the other end of the crank slider mechanism is connected with power source, the optical fiber load sensor is pasted on the surface of glass steel sample by structural glue, crank slider mechanism is driven by power source to do linear reciprocating motion, to simulate the fatigue test environment under blade vibration conditions.

[0007] Further, the crank slider mechanism comprises a slider, a connecting rod and a crank, the slider is connected with the glass steel sample, two ends of the connecting rod are hingedly connected with the slider and the crank respectively, and the crank is connected with an output end of the power source.

[0008] Further, the slider is in L-shaped structure, one side of which is connected with the glass steel sample through a bolt, and the other side of which is hingedly connected with the connecting rod.

[0009] Further, the clamp is composed of two L-shaped clamping pieces.

[0010] Further, the power source is a stepping motor.

[0011] Compared with the prior art, the auxiliary device has the following advantages and beneficial effects:

[0012] The auxiliary device can simulate the fatigue test environment under the blade vibration state, improve the optical fiber strain transmission efficiency and the accuracy of the sensor monitoring, and has the advantages of being reusable. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a three-dimensional schematic view of the utility model Figure One .

[0014] Figure 2 is a three-dimensional schematic view of the utility model Figure Two . DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0016] As shown in Figures 1 to 2 , the utility model provides a kind of wind turbine blade optical fiber fatigue test auxiliary device, including base 1, clamp 2, crank slider mechanism, optical fiber load sensor 7 and power source 8, one end of glass steel sample 6 of blade is fixed on base 1 by clamp 2, other end is connected with one end of crank slider mechanism, other end of crank slider mechanism is connected with power source 8, optical fiber load sensor 7 is pasted on the surface of glass steel sample 6 by structural adhesive, power source 8 is stepping motor, crank slider mechanism is driven by stepping motor, the reciprocating motion of slider 3 is realized by controlling the rotational speed and torque of stepping motor, to simulate the fatigue test environment under the blade vibration state.

[0017] Specifically, the slider-crank mechanism includes a slider 3, a connecting rod 4, and a crank 5. The slider 3 is connected to the fiberglass sample 6. The two ends of the connecting rod 4 are hinged to the slider 3 and the crank 5, respectively. The crank 5 is connected to the output end of the power source 8. The slider 3 is an L-shaped structure, one side of which is connected to the fiberglass sample 6 by bolts, and the other side is hinged to the connecting rod 4.

[0018] Specifically, the clamp 2 is composed of two L-shaped clamping parts connected together.

[0019] In order to improve the accuracy of sensor monitoring and ensure a firm connection between the sensor and the FRP sample, the following methods can be used: Figure 2 Use the method shown to paste. Use ERGO glue to glue the back of the sensor. The glue must be applied to the side of the sensor. Stick the sensor to the surface of the fiberglass sample. Divide the sensor into upper and lower sides along the center line. Press the side wall of the sensor and rub it up and down to squeeze out excess glue. Press the sensor with both hands until the glue solidifies. At this time, the optical fiber is not directly subjected to external force, which can effectively improve the strain transfer rate of the optical fiber.

[0020] The above is only a preferred embodiment of the present utility model patent, but the protection scope of the present utility model patent is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the present utility model patent based on the technical solution and the utility model patent concept of the present utility model patent, which falls within the protection scope of the present utility model patent.

Claims

1. An auxiliary device for optical fiber fatigue testing of wind turbine blades, characterized by: It includes a base, a clamp, a crank slider mechanism, a fiber optic load sensor and a power source. One end of the fiber optic reinforced plastic sample of the blade is fixed to the base by a clamp, and the other end thereof is connected to one end of the crank slider mechanism. The other end of the crank slider mechanism is connected to the power source. The fiber optic load sensor is attached to the surface of the fiber optic reinforced plastic sample by structural adhesive. The crank slider mechanism is driven by the power source to perform linear reciprocating motion, thereby simulating the fatigue test environment under the vibration state of the blade.

2. The wind turbine blade optical fiber fatigue test auxiliary device according to claim 1, characterized in that: The crank slider mechanism includes a slider, a connecting rod and a crank. The slider is connected to the fiberglass sample. The two ends of the connecting rod are hinged with the slider and the crank respectively. The crank is connected to the output end of the power source.

3. The wind turbine blade optical fiber fatigue test auxiliary device according to claim 2, characterized in that: The slider is L-shaped, one side of which is connected to the fiberglass sample by bolts, and the other side of which is hinged to the connecting rod.

4. The wind turbine blade optical fiber fatigue test auxiliary device according to claim 1, characterized in that: The clamp is composed of two L-shaped clamping parts connected together.

5. The wind turbine blade optical fiber fatigue test auxiliary device according to claim 1, characterized in that: The power source is a stepping motor.

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