Large-deformation damping testing device for wind power blade

Abstract

The utility model discloses a wind power blade large deformation damping testing device, comprising a test bench, an acceleration sensor, a displacement sensor, a displacement support, a motor support and at least one excitation motor, a blade is connected to the test bench through an adapter flange, a damper is arranged on the blade, the motor support is detachably fixed on the ground, and the motor support is detachably fixed on the test bench. The excitation motor is installed on the motor support, a traction rope of the excitation motor extends in the direction of the blade and is fixed to the blade, the displacement support is detachably fixed to the ground according to the preset installation position and is located beside the blade, and the displacement sensor is installed on the displacement support. The steel wire rope extends towards the direction of the blade and is fixed on the blade, and the two acceleration sensors are respectively mounted on the blade according to preset mounting positions. According to the utility model, the blade can be excited to large deformation, and the requirement of large deformation damping test of the blade is met.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbine blades, in particular to a large deformation damping test device for wind turbine blades. Background Art

[0002] Due to their enormous size, wind turbine blades are subject to a variety of forces during operation, including inertia, centrifugal forces, and aerodynamic forces. Under certain conditions, these forces can cause significant deformation or even flutter in the blades. Flutter is a self-excited vibration that, if not effectively controlled, can damage the blade structure, compromising the proper operation and safety of the wind turbine. Currently, dampers are primarily installed on the blades to address this issue. To verify the effectiveness of these dampers, large blade deformation damping tests are required.

[0003] Currently, wind turbine blades are mounted on a test bench for damping testing. Excitation methods typically involve manual vibration or hammering. These methods can only produce a certain amount of excitation force and small deformation on the blades, but cannot meet the requirements for large deformation. Therefore, how can blades be excited to achieve large deformation to meet the requirements of large deformation damping testing? Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a large deformation damping test device for wind turbine blades, which can excite the blades to large deformation and meet the requirements of large deformation damping test of the blades.

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

[0006] A large deformation damping test device for wind turbine blades comprises a test bench, a damper, an acceleration sensor, a displacement sensor, a displacement bracket, a motor bracket and at least one excitation motor. The blade is arranged horizontally, and its blade root is connected to the test bench through an adapter flange. The damper is arranged on the blade and is located on a side close to the blade root. The motor bracket is detachably fixed to the ground and is located next to a preset excitation position of the blade. The excitation motors are mounted on the motor bracket, and their number is determined according to the required excitation force. The traction rope of the excitation motor extends toward the blade and is fixed to the blade. The displacement bracket is detachably fixed to the ground according to a preset installation position and is located next to the blade. The displacement sensor is mounted on the displacement bracket, and its wire rope extends toward the blade and is fixed to the blade. There are two acceleration sensors, which are respectively mounted on the blade according to the preset installation positions.

[0007] Furthermore, the installation height of the excitation motor is consistent with the height of the shear center of the preset excitation position of the blade.

[0008] Furthermore, a counterweight is provided at the bottom of the motor bracket.

[0009] Furthermore, the motor bracket is detachably fixed to the ground by anchor bolts.

[0010] Furthermore, the axis of the motor bracket is perpendicular to the axis of the blade in space.

[0011] Furthermore, the distance between the displacement sensor and the blade is determined according to the blade amplitude.

[0012] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0013] 1. The test device of the utility model has a simple structure and is easy to operate. By adjusting the excitation frequency of the excitation motor to make it equal to the natural frequency of the blade itself, the blade can achieve the required large deformation through the resonance method. While meeting the large deformation, it can also ensure that there is no additional mass on the blade after unloading, meeting the requirements of the damping test.

[0014] 2. The installation position of the excitation motor in the test device of the utility model can be adjusted according to the required excitation position, and the excitation force can be solved by increasing the number of motors or increasing the motor model, which has strong flexibility and high practicality.

[0015] 3. The utility model is applicable to the damper test of bare blades or wind farms in urgent need, and can meet various needs of current blade damping tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0017] Figure 2 It is a top view of the utility model.

[0018] Figure 3 It is a side view of the present utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] like Figures 1 to 3As shown, this embodiment provides a large deformation damping test device for wind turbine blades, including a test bench 1, a damper 2, an acceleration sensor 3, a displacement sensor 4, a displacement bracket 5, a motor bracket 6 and at least one excitation motor 7. The blade 8 is arranged horizontally, and its blade root is connected to the test bench 1 through an adapter flange. The damper 2 is arranged on the blade 8 and is located on the side close to the blade root. The motor bracket 6 is detachably fixed to the ground with anchor bolts and is located next to the preset excitation position of the blade 8. The axis of the motor bracket 6 is perpendicular to the axis of the blade 8 in space. The excitation motor 7 is installed on the motor bracket 6, and its number According to the required exciting force, the traction rope 701 of the exciting motor 7 extends toward the blade 8 and is fixed on the blade 8. The installation height of the exciting motor 7 is consistent with the height of the shear center of the preset exciting position of the blade 8. The displacement bracket 5 is detachably fixed to the ground according to the preset installation position and is located next to the blade 8. The displacement sensor 4 is installed on the displacement bracket, and its wire rope 401 extends toward the blade 8 and is fixed on the blade 8. The distance between the displacement sensor 4 and the blade 8 is determined according to the amplitude of the blade 8. There are two acceleration sensors 3, which are installed on the blade 8 according to the preset installation positions.

[0021] In order to prevent the motor bracket from moving during the operation of the excitation motor, a counterweight block is provided at the bottom of the motor bracket.

[0022] The method of using the test device of this embodiment is as follows:

[0023] 1) Connect the blade to the test bench through the adapter flange, and apply the flange bolt preload as required to ensure that the blade is completely fixed to the test bench.

[0024] 2) Install the displacement sensor and accelerometer at the pre-set locations according to the test requirements. Leave enough clearance between the displacement sensor and the blade horizontally based on the amplitude. Ensure the excitation motor is installed at the same height as the shear center of the blade's pre-set excitation location.

[0025] 3) According to the blade's natural frequency, adjust the given cycle time t (ms) of the excitation motor

[0026] t=1 / f;

[0027] Where f is the blade natural frequency (Hz), which is excited according to the calculated given cycle time.

[0028] 4) Calculate the deformation of the position using the data collected by the acceleration sensor. The calculation formula is as follows:

[0029] A=a / (2πf)²;

[0030] Where A is the deformation amplitude (m); a is the peak-to-peak acceleration (m / s²); and f is the blade natural frequency (Hz).

[0031] 5) The displacement sensor is used to measure the data and record the deformation at that position.

[0032] 6) Based on the data measured by the acceleration and displacement sensors, the effective and true deformation can be obtained. If the deformation required by the test outline is reached, the excitation motor is immediately stopped and unloaded. Ensure that there is no additional mass on the blade after unloading, allowing the blade to decay freely while collecting acceleration and displacement data. If the excitation force of a single motor is insufficient to achieve the required deformation, it is necessary to gradually increase the number of motors to obtain sufficient excitation force to meet the requirements.

[0033] 7) Collect acceleration and displacement data during the free decay phase, calculate the damping ratio respectively, and verify the effectiveness of the test.

[0034] 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. A wind turbine blade large deformation damping test device, characterized by: It includes a test bench, a damper, an acceleration sensor, a displacement sensor, a displacement bracket, a motor bracket and at least one excitation motor. The blade is arranged horizontally, and its blade root is connected to the test bench through an adapter flange. The damper is arranged on the blade and is located on the side close to the blade root. The motor bracket is detachably fixed to the ground and is located next to the preset excitation position of the blade. The excitation motor is installed on the motor bracket, and the number of the excitation motors is determined according to the required excitation force. The traction rope of the excitation motor extends toward the blade and is fixed to the blade. The displacement bracket is detachably fixed to the ground according to the preset installation position and is located next to the blade. The displacement sensor is installed on the displacement bracket, and its wire rope extends toward the blade and is fixed to the blade. There are two acceleration sensors, which are installed on the blade according to the preset installation positions.

2. The wind turbine blade large deformation damping test device according to claim 1, characterized in that: The installation height of the excitation motor is consistent with the height of the shear center of the preset excitation position of the blade.

3. The wind turbine blade large deformation damping test device according to claim 1, characterized in that: A counterweight is provided at the bottom of the motor bracket.

4. The wind turbine blade large deformation damping test device according to claim 1, characterized in that: The motor bracket is detachably fixed to the ground by anchor bolts.

5. The wind turbine blade large deformation damping test device according to claim 1, characterized in that: The axis of the motor bracket is vertical to the axis of the blade in space.

6. The wind turbine blade large deformation damping test device according to claim 1, characterized in that: The distance between the displacement sensor and the blade is determined according to the blade amplitude.

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