Test bench and test system for testing wind turbine blade and pitch system

Abstract

A test bench for testing a wind turbine blade and a pitch system, comprising a foundational platform (1), a transition flange (2), a pitch bearing (3), a pitch motor, and a full-scale test blade (4). The transition flange has one end fixedly connected to the foundational platform and the other end fixedly connected to an outer ring of the pitch bearing by means of a bolt; the pitch bearing is in driving connection with the pitch motor; and an inner ring of the pitch bearing is fixedly connected to the full-scale test blade by means of a bolt. Also provided is a system for testing a wind turbine blade and a pitch system. The test bench expands the testing function of a conventional blade test platform, reduces the number of times a blade is detached for testing in different directions, and lowers the time and manpower input.

Description

An experimental bench and a test system for wind power blade and variable pitch system test

[0001] The present application claims priority to the Chinese patent application No. 202410648234.0, filed on May 23, 2024, and entitled "An experimental bench and a test system for wind power blade and variable pitch system test", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application belongs to the technical field of wind power generation, and particularly relates to an experimental bench and a test system for wind power blade and variable pitch system test. BACKGROUND

[0003] Both the blade and the variable pitch bearing are core components of a wind turbine generator, and it is of great significance to test them accordingly. However, the existing full-size blade and variable pitch system tests are carried out separately, and the blade and variable pitch system tests cannot be carried out simultaneously. That is, the full-size blade test platform only has blade test function, and usually the blade is fixed on the test platform for corresponding test. When the test direction needs to be adjusted, the blade is often disassembled from the test platform, the direction is adjusted, and then the blade is reassembled. The time for disassembly and assembly usually needs at least one week, which is time-consuming and laborious. In addition, since it is manual installation, the personnel experience and the requirements for calibration and installation are relatively high.

[0004] SUMMARY

[0005] The present application aims to provide an experimental bench and a test system for wind power blade and variable pitch system test, which solves the defect of single function of the existing wind power blade test platform.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0007] The present application provides an experimental bench for wind power blade and variable pitch system test, comprising a base platform, a transition flange, a variable pitch bearing, a variable pitch motor and a full-size test blade, wherein:

[0008] One end of the transition flange is fixedly connected with the base platform, and the other end is fixedly connected with the outer ring of the variable pitch bearing by bolts; the variable pitch bearing is drivingly connected with the variable pitch motor; the inner ring of the variable pitch bearing is fixedly connected with the full-size test blade by bolts.

[0009] Optionally, the variable pitch motor is installed in the inner cavity of the transition flange.

[0010] A system for wind power blade and variable pitch system test based on the experimental bench, comprising:

[0011] a vibration test assembly for modal test of the full-size test blade;

[0012] A fatigue test assembly for fatigue testing of a full-size test blade;

[0013] A variable pitch test assembly for testing a variable pitch bearing.

[0014] Optionally, the vibration test assembly comprises a first signal acquisition unit for acquiring blade vibration acceleration.

[0015] Optionally, the first signal acquisition unit comprises a plurality of biaxial vibration acceleration sensors, a plurality of first uniaxial vibration acceleration sensors, and a plurality of second uniaxial vibration acceleration sensors, wherein a pair of biaxial vibration acceleration sensors are arranged at each of at least three spanwise positions of the blade from the blade root to the blade tip, and the pair of biaxial vibration acceleration sensors are respectively pasted at the blade leading edge and the blade web at each spanwise position; the installation directions of the pair of biaxial vibration acceleration sensors respectively correspond to the blade edgewise and flapwise directions.

[0016] A pair of first uniaxial vibration acceleration sensors are arranged at each of at least five spanwise positions of the outer wall of the blade from the blade root to the blade tip, and the pair of first uniaxial vibration acceleration sensors are respectively pasted at the corresponding suction surface and pressure surface at each spanwise position.

[0017] The installation directions of the pair of first uniaxial vibration acceleration sensors are consistent with the blade edgewise direction.

[0018] A pair of second uniaxial vibration acceleration sensors are arranged at each of at least five spanwise positions of the outer wall of the blade from the blade root to the blade tip, and the pair of second uniaxial vibration acceleration sensors are respectively pasted at the corresponding blade leading edge and blade trailing edge at each spanwise position.

[0019] The installation directions of the pair of second uniaxial vibration acceleration sensors are consistent with the blade edgewise direction.

[0020] The spanwise positions where the first uniaxial vibration acceleration sensors and the second uniaxial vibration acceleration sensors are installed include the position at the blade tip.

[0021] Optionally, the fatigue test assembly comprises a second signal acquisition unit, a blade clamp, an exciter, and a blade fatigue excitation control system, wherein:

[0022] The control end of the exciter is connected to the output end of the blade fatigue excitation control system, the exciter is connected to the blade clamp, the blade clamp is clamped on the full-size test blade, and the second signal acquisition unit is used to acquire the strain signal of the full-size test blade.

[0023] Optionally, the second signal acquisition unit comprises a plurality of strain sensors, and each group of strain sensors is arranged on the outer wall of the blade at an interval of 2 meters from the blade root to the blade tip, and each group of strain sensors is provided with four strain sensors, and the installation positions of the four strain sensors are the leading edge UD, the trailing edge UD, the suction surface and the pressure surface of the blade respectively.

[0024] The installation direction of at least one strain sensor arranged at the blade root is perpendicular to the blade span direction, and the installation direction of the other strain sensors is consistent with the blade span direction.

[0025] Optionally, the pitch test assembly comprises a third signal acquisition unit and a pitch control unit, wherein:

[0026] The pitch control unit is connected with the pitch motor control, and the third signal acquisition unit is used for acquiring the vibration acceleration signal of the pitch bearing.

[0027] Optionally, the third signal acquisition unit comprises a plurality of three-axis vibration acceleration sensors, one current sensor and one voltage sensor, wherein three three-axis vibration acceleration sensors are arranged on the outer ring of the pitch bearing, and the three three-axis vibration acceleration sensors are respectively pasted and installed at the positions of 0°, 120° and 240° of the outer ring of the pitch bearing.

[0028] One three-axis vibration acceleration sensor is pasted and installed at the position of 90° of the inner ring of the pitch bearing.

[0029] The pitch motor is internally provided with one current sensor and one voltage sensor.

[0030] Compared with the prior art, the beneficial effects of the present application are:

[0031] The experimental bench for testing the wind power blade and the pitch system provided by the present application connects the pitch system, the full-size test blade and the base platform through the transition flange, realizes the synchronous test of the blade and the pitch system and the pitch function, and can realize the corresponding test requirements by selectively carrying different test systems. The experimental bench greatly expands the test functions of the traditional blade test platform, and controls the rotation of the pitch bearing and the full-size test blade through the pitch control system, thereby significantly reducing the disassembly times of the blade during testing in different directions and reducing the time and personnel investment. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 is a front view of the experimental bench;

[0033] Fig. 2 is a rear view of the experimental bench;

[0034] Fig. 3 is a data acquisition system architecture diagram in the test system;

[0035] Fig. 4 is a schematic diagram of a fatigue excitation system;

[0036] Wherein, 1-base platform, 2-transition flange, 3-pitch bearing, 4-full-size test blade, 5-control room, 6-blade fatigue excitation control system, 7-clamp, 8-vibration exciter. DETAILED DESCRIPTION

[0037] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, technologies, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0038] Embodiment 1

[0039] As shown in FIG. 1, the test bench for testing wind turbine blade and pitch system provided by the embodiment includes a base platform, a transition flange, a pitch bearing, a pitch motor, a full-size test blade, and a pitch control system, wherein:

[0040] One end of the transition flange is fixedly connected with the base platform, and the other end is fixedly connected with the outer ring of the pitch bearing.

[0041] The pitch motor is installed in the inner cavity of the transition flange.

[0042] Meanwhile, the output shaft of the pitch motor is connected with the pitch bearing through gear engagement.

[0043] The control end of the pitch motor is connected with the pitch control system.

[0044] The full-size test blade is connected with the inner ring of the pitch bearing through bolts.

[0045] Working process of the embodiment:

[0046] The torque of the pitch motor is controlled by the pitch control system, and the rotation of the pitch bearing and the full-size test blade is driven by the pitch motor.

[0047] Embodiment 2

[0048] Based on embodiment 1, the test system for testing wind turbine blade and pitch system provided by the embodiment includes:

[0049] a vibration test assembly for modal testing of the full-size test blade;

[0050] a fatigue test assembly for fatigue testing of the full-size test blade;

[0051] Pitch test assembly used for testing pitch bearings.

[0052] Example 3

[0053] Based on Embodiment 2, this embodiment provides a test system for testing wind turbine blades and pitch systems, wherein the vibration test component includes a first signal acquisition unit for acquiring blade vibration acceleration.

[0054] Example 4

[0055] Based on Embodiment 3, this embodiment provides a test system for testing wind turbine blades and pitch systems. The first signal acquisition unit includes multiple biaxial vibration acceleration sensors, multiple first uniaxial vibration acceleration sensors, and multiple second uniaxial vibration acceleration sensors. In the inner cavity of the blade, at least three spanwise positions from the blade root to the blade tip are each provided with a pair of biaxial vibration acceleration sensors. The pair of biaxial vibration acceleration sensors are respectively attached to the leading edge of the blade and the blade web at each spanwise position.

[0056] The installation directions of the pair of biaxial vibration acceleration sensors correspond to the blade flapping and oscillating directions, respectively, and the installation positions of the pair of biaxial vibration acceleration sensors can include the farthest accessible position inside the blade.

[0057] The sampling frequency of the dual-axis vibration accelerometer is ≥128Hz.

[0058] A pair of first uniaxial vibration acceleration sensors are arranged at at least five spanwise positions on the outer wall of the blade from the blade root to the blade tip. The pair of first uniaxial vibration acceleration sensors are respectively attached to the suction surface and pressure surface at each spanwise position.

[0059] The installation orientation of the pair of first uniaxial vibration acceleration sensors is consistent with the blade flapping direction.

[0060] A pair of second uniaxial vibration acceleration sensors are arranged at at least five spanwise positions on the outer wall of the blade from the root to the tip. The pair of second uniaxial vibration acceleration sensors are respectively attached to the leading edge and trailing edge of the blade at each spanwise position.

[0061] The installation direction of the pair of second uniaxial vibration acceleration sensors is consistent with the direction of blade oscillation.

[0062] The first and second uniaxial vibration acceleration sensors are both installed at the blade tip position in the spanwise direction.

[0063] The sampling frequencies of both the first and second uniaxial vibration acceleration sensors are ≥128Hz.

[0064] Embodiment 5

[0065] Based on embodiment 2, the test system for testing wind power blade and variable pitch system provided by the embodiment comprises a second signal acquisition unit, a blade clamp, an exciter and a blade fatigue excitation control system, wherein:

[0066] The control end of the exciter is connected with the output end of the blade fatigue excitation control system, the exciter is connected with the blade clamp, the blade clamp is clamped on the full-size test blade, and the second signal acquisition unit is used to acquire the strain signal of the full-size test blade.

[0067] Embodiment 6

[0068] Based on embodiment 5, the test system for testing wind power blade and variable pitch system provided by the embodiment, the second signal acquisition unit comprises a plurality of strain sensors, one group of strain sensors is arranged on the outer wall of the blade every 2 meters from the blade root to the blade tip, each group of strain sensors is provided with four strain sensors, and the installation positions of the four strain sensors are respectively the leading edge UD, the trailing edge UD, the suction surface and the pressure surface of the blade.

[0069] The installation direction of at least one strain sensor of the strain sensors arranged at the blade root is perpendicular to the span direction, and the installation direction of the other strain sensors is consistent with the span direction.

[0070] The sampling frequency of the strain sensor is greater than or equal to 50 Hz.

[0071] The laying range corresponding to the plurality of strain sensors covers at least the position from the blade root to 70% of the blade span.

[0072] Embodiment 7

[0073] Based on embodiment 2, the test system for testing wind power blade and variable pitch system provided by the embodiment, the variable pitch test assembly comprises a third signal acquisition unit and a variable pitch control unit, wherein:

[0074] The variable pitch control unit is connected with the variable pitch motor control, and the third signal acquisition unit is used to acquire the vibration acceleration signal of the variable pitch bearing.

[0075] Embodiment 8

[0076] On the basis of embodiment 7, the test system for testing wind power blade and variable pitch system provided by the embodiment comprises a third signal acquisition unit, wherein the third signal acquisition unit comprises a plurality of three-axis vibration acceleration sensors, a current sensor and a voltage sensor.

[0077] One three-axis vibration acceleration sensor is attached to the inner ring of the variable pitch bearing at a position of 90°.

[0078] One current sensor and one voltage sensor are attached to the inside of the variable pitch motor.

[0079] The sampling frequency of the current sensor is ≥128Hz, and the sampling frequency of the voltage sensor is ≥128Hz.

[0080] Embodiment 9

[0081] On the basis of embodiment 2, the test system for testing wind power blade and variable pitch system provided by the embodiment further comprises an acoustic emission test system for damage propagation test of the full-size test blade.

[0082] Embodiment 10

[0083] On the basis of embodiment 9, the test system for testing wind power blade and variable pitch system provided by the embodiment, the acoustic emission unit comprises a plurality of acoustic emission sensors, and at least three spanwise positions from the blade root to the blade tip of the blade are each provided with a pair of acoustic emission sensors, which are respectively attached to the corresponding girder positions of the web and the pressure surface at each spanwise position.

[0084] Each acoustic emission sensor is connected with an amplifier.

[0085] The sampling frequency of the acoustic emission sensor is ≥1MHz.

[0086] Embodiment 11

[0087] On the basis of embodiment 2, the test system for testing wind power blade and variable pitch system provided by the embodiment further comprises a noise test system for noise test of the full-size test blade.

[0088] The noise test assembly comprises a pickup, and the pickup is installed on the ground close to the blade tip.

[0089] The sampling frequency of the pickup is ≥2kHz.

[0090] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A test bench for wind turbine blade and pitch system testing, characterized in that, The experimental table comprises a base platform, a transition flange, a variable pitch bearing, a variable pitch motor and a full-size test blade, wherein: One end of the transition flange is fixedly connected with the base platform, and the other end is fixedly connected with an outer ring of the variable pitch bearing through bolts; the variable pitch bearing is drivingly connected with the variable pitch motor; an inner ring of the variable pitch bearing is fixedly connected with the full-size test blade through bolts.

2. A test bench for wind turbine blade and variable pitch system testing according to claim 1, characterized in that, The variable pitch motor is installed in an inner cavity of the transition flange.

3. A system for wind turbine blade and variable pitch system testing, characterized in that, The experimental table according to claim 1 or 2 comprises: a vibration test assembly for modal testing of the full-size test blade; a fatigue test assembly for fatigue testing of the full-size test blade; a variable pitch test assembly for testing of the variable pitch bearing.

4. The system for testing of wind turbine blade and variable pitch system according to claim 3, characterized in that, The vibration test assembly comprises a first signal acquisition unit for acquisition of blade vibration acceleration.

5. The system for testing of wind turbine blade and variable pitch system according to claim 4, characterized in that, The first signal acquisition unit comprises a plurality of biaxial vibration acceleration sensors, a plurality of first uniaxial vibration acceleration sensors and a plurality of second uniaxial vibration acceleration sensors, wherein a pair of biaxial vibration acceleration sensors are arranged at each of at least three spanwise positions of the blade from the blade root to the blade tip, and the pair of biaxial vibration acceleration sensors are respectively pasted at the blade leading edge and the blade web at each spanwise position; the installation directions of the pair of biaxial vibration acceleration sensors respectively correspond to the flapping and edgewise directions of the blade; a pair of first uniaxial vibration acceleration sensors are arranged at each of at least five spanwise positions of the outer wall of the blade from the blade root to the blade tip, and the pair of first uniaxial vibration acceleration sensors are respectively pasted at the corresponding suction surface and pressure surface at each spanwise position; the installation directions of the pair of first uniaxial vibration acceleration sensors are consistent with the flapping direction of the blade; a pair of second uniaxial vibration acceleration sensors are arranged at each of at least five spanwise positions of the outer wall of the blade from the blade root to the blade tip, and the pair of second uniaxial vibration acceleration sensors are respectively pasted at the corresponding blade leading edge and blade trailing edge at each spanwise position; the installation directions of the pair of second uniaxial vibration acceleration sensors are consistent with the edgewise direction of the blade; the spanwise positions where the first uniaxial vibration acceleration sensors and the second uniaxial vibration acceleration sensors are installed include the position at the blade tip.

6. The system for testing of wind turbine blade and variable pitch system according to claim 3, characterized in that, The fatigue test assembly comprises a second signal acquisition unit, a blade clamp, an exciter and a blade fatigue excitation control system, wherein: a control end of the exciter is connected with an output end of the blade fatigue excitation control system, the exciter is connected with the blade clamp, the blade clamp is clamped on the full-size test blade, and the second signal acquisition unit is used for acquisition of strain signals of the full-size test blade.

7. The system for testing of wind turbine blade and variable pitch system according to claim 6, characterized in that, The second signal acquisition unit comprises a plurality of strain sensors, and a group of strain sensors are arranged on the outer wall of the blade at every interval of 2 meters from the blade root to the blade tip, and each group of strain sensors is provided with four strain sensors; the installation positions of the four strain sensors are respectively the leading edge UD, the trailing edge UD, the suction surface and the pressure surface of the blade; at least one strain sensor arranged at the blade root has an installation direction perpendicular to the span direction of the blade, and the installation directions of the other strain sensors are consistent with the span direction of the blade.

8. The system for testing of wind turbine blade and variable pitch system according to claim 3, characterized in that, The variable pitch test assembly comprises a third signal acquisition unit and a variable pitch control unit, wherein: The variable pitch control unit is connected with a variable pitch motor control; and the third signal acquisition unit is configured to acquire a vibration acceleration signal of the variable pitch bearing.

9. The system for testing of wind turbine blade and variable pitch system according to claim 8, characterized in that, The third signal acquisition unit comprises a plurality of triaxial vibration acceleration sensors, one current sensor and one voltage sensor. Three triaxial vibration acceleration sensors are arranged on the outer ring of the variable pitch bearing, and are respectively attached to the outer ring of the variable pitch bearing at positions of 0°, 120° and 240°. One triaxial vibration acceleration sensor is attached to the inner ring of the variable pitch bearing at a position of 90°. The variable pitch motor is internally provided with one current sensor and one voltage sensor.

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