A performance test device and test method for a new fan vibration reduction structure

Abstract

The application discloses a performance test device and test method for a new fan damping structure, and relates to the technical field of performance test devices, comprising a test tool, a workpiece is connected to the test tool through threads, the workpiece comprises a test piece and a testee, a test bed is connected to the bottom of the test tool through threads, a vibration source group is transmissionally connected below the test bed, a first sensing part is fixedly installed at the side of the upper surface of the test bed, a second sensing part is fixedly installed at the side of the top of the workpiece, a control end is arranged outside the test bed, and the control end is signal-connected with the vibration source group, the first sensing part and the second sensing part; the test piece is composed of a cover plate, an outer cover, a side plate, multiple connecting parts and an imitation weight-increasing part, and the testee is multiple ground foot parts, and the device realizes the performance test process of the new fan damping structure.

Description

Technical Field

[0001] This invention relates to the field of performance testing equipment technology, specifically to a performance testing device and testing method for a novel wind turbine vibration reduction structure. Background Technology

[0002] When a wind turbine is subjected to external excitation, it may resonate with itself, leading to damage. Considering economic factors, vibration reduction measures are necessary to reduce the vibration load transmitted from the power system to the turbine structure, improve the overall vibration environment, and enhance structural durability. Therefore, vibration-damping components are installed between the wind turbine and the mounting plate, and these components are made of a damping alloy. This damping alloy is a novel damping alloy material that possesses rubber-like damping properties while maintaining the strength of structural steel. Its principle is to dissipate the energy generated by vibration through the formation and movement of internal twins, thereby achieving vibration reduction. Therefore, performance tests, especially vibration tests, are required before using the vibration-damping components, as this directly determines the actual performance of the new wind turbine after the installation of the vibration-damping components. Summary of the Invention

[0003] The purpose of this invention is to provide a performance testing device and method for a novel wind turbine vibration reduction structure, so as to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a performance testing device for a novel wind turbine vibration reduction structure, comprising a testing fixture, on which a workpiece is threadedly connected, the workpiece including a test piece and a test piece, a test bench is threadedly connected to the bottom of the testing fixture, a vibration source group is drivenly connected to the bottom of the test bench, a first sensing unit is fixedly installed on the side of the upper surface of the test bench, a second sensing unit is fixedly installed on the side of the top of the workpiece, and a control terminal is provided on the outside of the test bench, the control terminal being signal-connected to the vibration source group, the first sensing unit, and the second sensing unit; The test specimen consists of a cover plate, an outer cover, side plates, multiple sets of connecting parts, and imitation weight-adding parts. The test specimen consists of multiple sets of foot pieces. The test fixture includes a base, two sets of protrusions, multiple sets of fixing nuts, and a support base. The support base is divided into an upper ring, a lower ring, and a base plate. The base has an installation groove at the position corresponding to the bottom of the imitation weight-adding parts. A set of pressure-sensitive pads is embedded in the inner wall of the upper ring of the support base. A third sensor is connected to the side of the pressure-sensitive pads away from the inside of the support base. Imitation support sources are evenly distributed on the inner wall of the lower ring of the support base. The base plate of the support base runs through the installation groove, and a set of telescopic cylinders is evenly fixed on the bottom surface of the base plate. The output end of the telescopic cylinders is fixedly connected to the base plate to complete various simulated support states. A fourth sensor is embedded in the base plate of the support base.

[0005] The present invention further describes that the cover plate is fixedly connected to the top of the outer cover, the second sensing part is fixedly installed on one side of the top of the cover plate, the imitation weight-adding part is fixed inside the outer cover, the imitation weight-adding part is composed of a fan-shaped upper part and a cylindrical lower part, the cylindrical lower part protrudes from the bottom of the outer cover, and the side plate and the bottom side of the outer cover are integrally formed. The number and position of multiple sets of connectors and multiple sets of anchors are consistent. The top side of the anchor is fastened to the top of the connector by bolts, and the bottom side of the connector is fastened to the side plate by bolts. The height of the horizontal plane where the top surface of the anchor is located is higher than the height of the horizontal plane where the top surface of the side plate is located.

[0006] The present invention further describes that two sets of protrusions are fixed in parallel on both sides of the upper surface of the base and distributed on the outside of the imitation weight-adding parts. The upper surface of the protrusions is fastened to the middle of the bottom surface of the foot piece by bolts. Multiple sets of fixing nuts are used to fasten the connecting parts and the side plate. The side of the support seat facing the workpiece is set as an opening and hollow inside.

[0007] The present invention further describes that the imitation support source includes a support side plate, a telescopic rod and a receiving groove. The side surface of the support side plate facing the inside of the support base is rounded. The support side plate is slidably connected to the inside of the receiving groove. The telescopic rod includes an outer rod fixedly installed inside the support side plate, an inner rod slidably connected inside the outer rod, and a spring fixedly connected between the inner rod and the outer rod. The other side of the inner rod is fixed to the inner wall of the receiving groove.

[0008] The present invention further illustrates that the fourth sensing unit is signal-connected to the control terminal, and the signal input terminal of the fourth sensing unit is fixedly connected to a supporting inner plate, which is located below the lower ring of the support base.

[0009] The present invention further describes that the base has locking holes arranged in an array on its side. Locking nuts are spirally tightened inside the locking holes. The lower half of the locking nuts is locked to the surface of the test bench. A locking component is provided on one side of the locking holes. The locking component is composed of an upper horizontal plate, a vertical plate, and a lower horizontal plate. The lower horizontal plate is fastened to the test bench by bolts. The upper horizontal plate abuts against the upper surface of the base at the location of the locking holes. A fifth sensing unit is connected through and fixedly connected to the upper horizontal plate directly above the locking holes. The detection end of the fifth sensing unit contacts the top surface of the locking nut. The top surface of the locking nut is flat.

[0010] A performance testing method for a novel wind turbine vibration damping structure, implemented using a performance testing device, includes: The first step is to install the test fixture onto the test bench, and the locking parts further define the installation position of the test fixture according to their respective locking holes; The second step is to install the workpiece onto the test fixture. The first and second sensing units are fastened to the preset measuring points, and the control terminal is used to receive the feedback vibration data. The third step is to determine the simulated support state of the workpiece being measured by using the positional relationship between the support base and the simulated weight-adding component. The fourth step involves determining the simulated support state of the workpiece, with the first and second sensing units performing data calibration, and the third, fourth, and fifth sensing units providing corresponding pressure data feedback. The fifth step involves conducting preliminary tests of random vibration in three directions, sinusoidal frequency sweep, and flat spectrum in sequence. After the tests, it is determined whether there is a risk of harmful deformation. If there is a risk of harmful deformation, the subsequent durability vibration test is suspended, and the test proceeds to the eighth step. If there is no risk of harmful deformation, the durability vibration test continues. Step 6: Perform the durability vibration test. Pre-set the vibration time and test vibration parameters in the three directions under the durability vibration test, and then start the durability vibration test. Step 7: During the durability vibration test, conduct real-time fault monitoring. If a vibration fault occurs that is sufficient to affect the test results, immediately stop the test and proceed to step 8; otherwise, continue the test until the time limit is reached. Step 8: The vibration test is complete, and the user retrieves the test results from the control terminal.

[0011] Compared with the prior art, the beneficial effects achieved by the present invention are: the present invention adopts test fixtures and various sensing units, which can complete the vibration test process under various simulated support conditions, and can realize harmful risk analysis during the test, thereby improving the accuracy of the test results. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall installation structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the experimental tooling and the workpiece connection of the present invention; Figure 3 This is a schematic diagram of the overall structure of the workpiece of the present invention; Figure 4 This is a front view schematic diagram of the connection between the experimental fixture and the workpiece of the present invention; Figure 5 This is a schematic diagram of the overall structure of the experimental tooling of the present invention; Figure 6 This is the present invention. Figure 5 A top-view structural diagram; Figure 7This is the present invention. Figure 5 A schematic diagram of the cross-sectional structure; Figure 8 This is a cross-sectional structural diagram of the locking component installation position of the present invention; In the diagram: 1. Test fixture; 11. Base; 12. Locking hole; 121. Locking nut; 13. Protrusion; 14. Fixing nut; 15. Support seat; 16. Pressure-sensitive pad; 17. Telescopic cylinder; 18. Simulation support source; 181. Support side plate; 182. Telescopic rod; 183. Receiving groove; 19. Support inner plate; 2. Test bench; 3. Vibration source group; 31. Z-axis vibration source; 32. Y-axis vibration source; 33. X-axis vibration source; 4. Workpiece; 41. Cover plate; 42. Outer cover; 43. Side plate; 44. Connector; 45. Foot piece; 46. Simulation weight-adding piece; 5. First sensor unit; 6. Second sensor unit; 7. Third sensor unit; 8. Fourth sensor unit; 9. Locking piece; 10. Fifth sensor unit. Detailed Implementation

[0013] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0014] Please see Figures 1 to 8 This invention provides a technical solution: a performance testing device for a novel wind turbine vibration reduction structure, comprising a testing fixture 1, on which a workpiece 4 is threadedly connected. The testing fixture 1 is used to perform vibration testing of the novel wind turbine vibration reduction structure. The workpiece 4 is made of aluminum alloy material mimicking the shape of a wind turbine. A testing platform 2 is threadedly connected to the bottom of the testing fixture 1, and a vibration source group 3 is drivenly connected below the testing platform 2 to perform a three-dimensional vibration process, such as... Figure 1 As shown, a first sensing unit 5 is fixedly installed on the upper side of the test bench 2, and a second sensing unit 6 is fixedly installed on the top side of the workpiece 4. These two locations are usually set as measuring points. The first sensing unit 5 and the second sensing unit 6 are triaxial accelerometers. A control terminal is set on the outside of the test bench 2. The control terminal is connected to the vibration source group 3, the first sensing unit 5 and the second sensing unit 6. After inputting the required vibration data, the vibration source group 3 is started, and then the vibration test on the workpiece 4 and the closed-loop feedback of the vibration data are effectively executed. The vibration reduction effect is obtained through the vibration data fed back by the first sensing unit 5 and the second sensing unit 6.

[0015] Further, workpiece 4 includes a test piece and a sample piece. The sample piece consists of multiple sets of foot pieces 45. The test piece is composed of a cover plate 41, an outer cover 42, a side plate 43, multiple sets of connecting parts 44, and a simulated weight-adding part 46. Specifically, the cover plate 41 is fixedly connected to the top of the outer cover 42. The aforementioned second sensing unit 6 is fixedly installed on one side of the top of the cover plate 41. The simulated weight-adding part 46 is fixed inside the outer cover 42. The simulated weight-adding part 46 consists of a fan-shaped upper part and a cylindrical lower part. The cylindrical lower part protrudes from the bottom of the outer cover 42. The side plate 43 is integrally formed with the bottom side of the outer cover 42 and is used for... The external structure is connected, in this embodiment, to the vibration damping structure, namely the anchor piece 45. The anchor piece 45 adopts a spring-type vibration damping alloy. Specifically, the number and position of the multiple sets of connectors 44 are consistent with those of the multiple sets of anchor pieces 45. The top side of the anchor piece 45 is fastened to the top of the connector 44 by bolts, and the bottom side of the connector 44 is fastened to the side plate 43 by bolts. It should be noted that the height of the horizontal plane where the top surface of the anchor piece 45 is located is higher than the height of the horizontal plane where the top surface of the side plate 43 is located. The multiple sets of anchor pieces 45 are evenly distributed around the side plate 43 to achieve a uniform vibration damping effect.

[0016] Furthermore, the vibration source group 3 includes a Z-axis vibration source 31, a Y-axis vibration source 32, and an X-axis vibration source 33, which are driven and installed below the test bench 2 in three directions. The vibration source group 3 adopts an electric vibration table. After receiving the vibration data from the control terminal, it uses alternating electromagnetic force to drive the test bench 2 to perform reciprocating motion in the corresponding direction, thereby performing the vibration test procedure of the workpiece 4.

[0017] refer to Figures 4 to 7 The test fixture 1 includes a base 11, two sets of protrusions 13, multiple sets of fixing nuts 14, and a support base 15. The two sets of protrusions 13 are fixed parallel to each other on both sides of the upper surface of the base 11 and distributed on the outside of the imitation weight-adding parts 46. The upper surface of the protrusions 13 is fastened to the middle of the bottom surface of the foot piece 45 by bolts, thereby realizing the support connection between the protrusions 11 and the workpiece 4. The multiple sets of fixing nuts 14 are used to fasten the connecting parts 44 and the side plate 43. Therefore, when the test bench 2 vibrates, the base 11 and protrusions 13 in the test fixture 1 will drive the workpiece 4 to vibrate synchronously. The base 11 has an installation groove at the bottom of the imitation weight-adding component 46. The inner wall diameter of the support 15 is the same as the diameter of the installation groove, and the size of the installation groove is larger than the bottom size of the imitation weight-adding component 46, so that the bottom of the imitation weight-adding component 46 can be stably and accurately inserted into the interior of the support 15, thereby enabling the workpiece 4 to achieve vibration detection under various simulated support conditions.

[0018] Furthermore, the support base 15 is configured with an opening on the side facing the workpiece 4 and is hollow inside. The interior of the support base 15 is divided into an upper ring, a lower ring, and a base plate.

[0019] A set of pressure-sensitive pads 16 are embedded in the inner wall of the upper ring of the support base 15. The pressure-sensitive pads 16 are arranged in a semi-circular shape. A third sensing unit 7 is connected to the side of the pressure-sensitive pads 16 away from the inside of the support base 15. The third sensing unit 7 is a pressure sensor. The outer wall of the third sensing unit 7 is fixedly installed on the outer wall of the support base 15. When the bottom of the imitation weight-adding component 46 is located inside the upper ring of the support base 15, the third sensing unit 7 will determine the tilt state of the imitation weight-adding component 46 by the pressure value of the pressure-sensitive pads 16.

[0020] The lower ring of the support base 15 has uniformly arranged imitation support sources 18 on its inner wall to simulate the side wall support state of the imitation weight-adding component 46. Specifically, the imitation support source 18 includes a support side plate 181, a telescopic rod 182, and a receiving groove 183. The side surface of the support side plate 181 facing the inside of the support base 15 is rounded. The support side plate 181 is slidably connected to the inside of the receiving groove 183. The telescopic rod 182 includes an outer rod fixedly installed inside the support side plate 181 and an inner rod slidably connected inside the outer rod. The rod and the spring fixedly connected between the inner rod and the outer rod, the other side of the inner rod is fixed to the inner wall of the receiving groove 183. When the support side plate 181 is subjected to pressure parallel to the extension direction of the telescopic rod 182 and toward the inside of the receiving groove 183, the support side plate 181 will slide toward the receiving groove 183 along the extension direction of its inner telescopic rod 182, and the telescopic rod 182 will retract. When the pressure is removed, under the rebound action of the spring inside the telescopic rod 182, the support side plate 181 will extend to its original extended state.

[0021] The base plate of the support 15 extends through the mounting groove, and a set of telescopic cylinders 17 are evenly fixed on the bottom surface of the base plate. The telescopic cylinders 17 are fixedly installed on the test bench 2. An air pipe is connected inside the telescopic cylinder 17, and the air pipe is connected to an air pump. The air pump is located outside the overall device and is not shown in the figure. In addition, a pipe groove is opened in the middle of the surface of the base 11 near the test bench 2. The pipe groove is used to gather the air pipe and the conductive wire. The output end of the telescopic cylinder 17 is fixedly connected to the base plate. When the telescopic cylinder 17 is started, its output end can drive the entire support 15 to adjust its height position through the base plate, thereby adjusting the support state between the support 15 and the simulated weight-adding component 46 to complete various simulated support states.

[0022] Furthermore, a fourth sensor 8 is embedded inside the base plate of the support 15. The fourth sensor 8 can be a gravity sensor. The fourth sensor 8 is connected to the control terminal, and the signal input terminal of the fourth sensor 8 is fixedly connected to the inner support plate 19. The inner support plate 19 is located below the lower ring of the support 15. When the inner support plate 19 abuts against the imitation weight-adding component 46, the fourth sensor 8 will transmit a gravity signal to the control terminal, indicating that the bottom of the imitation weight-adding component 46 has been abutted and fixed.

[0023] refer to Figure 4 and Figure 8 The base 11 has locking holes 12 arranged in an array on its side. A locking nut 121 is screwed into each locking hole 12. The lower half of the locking nut 121 is locked to the surface of the test bench 2. A locking element 9 is provided on one side of the locking hole 12. The locking element 9 is composed of an upper horizontal plate, a vertical plate, and a lower horizontal plate. The lower horizontal plate is fastened to the test bench 2 by bolts. The upper horizontal plate abuts against the upper surface of the base 11 at the location of the locking hole 12. The upper horizontal plate is directly above the locking hole 12 and is fixedly connected to a locking element 9. The fifth sensor 10 is a pressure sensor and is connected to the control terminal signal. The detection end of the fifth sensor 10 is in contact with the top surface of the locking nut 121, and the top surface of the locking nut 121 is flat. When installing the test fixture 1, the locking part 9 is used to improve the connection tightness of the test fixture 1 on the test bench 2. At the same time, the fifth sensor 10 is used to monitor whether there is any loosening problem in the installation of the test fixture 1 in real time or at regular intervals, so as to determine the availability of the measured vibration data.

[0024] When installing the first sensor unit 5, the second sensor unit 6, the third sensor unit 7, the fourth sensor unit 8, and the fifth sensor unit 10, screws or glue can be used for fastening. It should be noted that the mounting surface needs to be cleaned before installation to improve the tightness between the sensor unit and the mounting surface.

[0025] When conducting performance tests on the novel wind turbine vibration reduction structure in this embodiment, the specific test methods used with this device are as follows: The first step is to install the test fixture 1 onto the test bench 2, and the locking parts 9 further limit the installation position of the test fixture 1 according to their respective locking holes 12; This improves the tightness of the connection between the test fixture 1 and the test bench 2. At the same time, the fifth sensor 10 monitors in real time or at regular intervals whether the test fixture 1 is loose during the vibration test, thereby determining the usability of the measured vibration data.

[0026] Specifically, after the overall installation of the test fixture 1 and the locking component 9 is completed, the detection end of the fifth sensor 10 abuts against the top surface of the locking nut 121 and acquires the pressure value. A standard pressure value is preset. During the locking process of the locking component 9, the pressure values ​​Fd of all fifth sensors 10 are required to reach the standard pressure value Fd0, which is the initial locking state of the test fixture 1. The pressure value represented by each fifth sensor 10 is recorded as Fd. i i is an integer between 1 and n, where n is the total number of locking elements 9 or fifth sensing units 10, and i represents the serial number of the locking elements 9 or fifth sensing units 10; when in the initial locking state, Fd i If it equals Fd0, the user then executes the second step; The second step is to install the workpiece 4 onto the test fixture 1. The first sensor 5 and the second sensor 6 are fastened to the preset measuring points. The control terminal is used to receive the feedback vibration data. The test piece and the protrusion 13 are fastened together by bolts. The simulated weight-adding part 46 is required to be located directly above the support base 15.

[0027] The third step is to determine the simulated support state of the workpiece 4 by using the positional relationship between the support base 15 and the imitation weight-adding component 46. The simulated support conditions include the following: Simulated support state one: The telescopic cylinder 17 is in the initial state and the imitation weight-adding component 46 is located above the upper ring of the support base 15. In this state, the pressure values ​​Fg1 and Fg2 of the two sets of pressure-sensitive pads 16 are both 0; used to simulate the state in which the new type of fan is supported only by the test piece. Simulated support state two: The telescopic cylinder 17 drives the support base 15 to rise and the imitation weight-adding component 46 is located in the upper ring of the support base 15. The side wall of the imitation weight-adding component 46 does not apply pressure to the pressure-sensitive pads 16, that is, the pressure values ​​Fg1 and Fg2 of the two sets of pressure-sensitive pads 16 are both 0. This is used to simulate the external object-assisted support state when the new type of fan relies on the test piece for support and also exists under vibration within a certain gap range. Simulated support state three: The telescopic cylinder 17 drives the support base 15 to rise and the imitation weight-adding component 46 is located in the lower ring of the support base 15. It imitates the support source 18 to provide uniform support to the side wall of the imitation weight-adding component 46, and the side wall of the imitation weight-adding component 46 does not apply pressure to the pressure-sensitive pads 16. That is, the pressure values ​​Fg1 and Fg2 of the two sets of pressure-sensitive pads 16 are both 0. It is used to simulate the support state of the new type of fan when the test specimen is supported, supported in the X direction, and supported in the Y direction. Simulated support state four: The telescopic cylinder 17 drives the support base 15 to rise, simulating the support source 18 supporting the side wall of the simulated weight-adding component 46, and the bottom plate of the support base 15 presses against the bottom of the simulated weight-adding component 46. The pressure values ​​Fg1 and Fg2 of the two sets of pressure-sensitive pads 16 are both 0. The pressure value measured by the fourth sensor 8 is recorded as Fc. The pressure value Fc is required to reach the standard pressure value Fc0. This is used to simulate the support state of the new type of fan when the test piece is supported, supported in the X direction, supported in the Y direction, and supported in the Z direction. Before conducting a vibration test, the user should first select the simulated support state and then conduct the vibration test under the corresponding state.

[0028] Fourth step: After determining the simulated support state of workpiece 4, the first sensing unit 5 and the second sensing unit 6 perform data calibration, and the third sensing unit 7, the fourth sensing unit 8 and the fifth sensing unit 10 provide corresponding pressure data feedback to ensure that it is in the standard state corresponding to the simulated support state before measurement; to avoid resonance problems caused by loose parts before measurement. The requirements for the standard state are the same as the numerical requirements for each simulated support state in step three.

[0029] The fifth step involves conducting preliminary tests of random vibration in three directions, sinusoidal frequency sweep, and flat spectrum in sequence. Before conducting the preliminary tests, the vibration time and test vibration parameters are preset. After the test, it is determined whether there is a risk of harmful deformation. If there is a risk of harmful deformation, the subsequent durability vibration test is paused and the test proceeds to the eighth step. If there is no risk of harmful deformation, the durability vibration test continues. For example, in the random vibration test, the vibration time in all three directions is set to 5 minutes, and the test vibration parameters include frequency and the corresponding power spectral density in the three directions; in the sinusoidal sweep test, the vibration time in all three directions is set to 5 minutes, and the test vibration parameters are on the sweep frequency order of 0.5 G; in the flat spectrum test, the vibration time in all three directions is set to 5 minutes, and the test vibration parameters are on the flat spectrum order of 0.02 G (10-2000 Hz). After completing the above tests, a harmful deformation assessment is performed to determine whether a harmful deformation state has occurred, which could easily lead to severe deformation later. A harmful deformation prediction formula D is established, specifically as follows: ; The above formula requires ∆Fd represents the maximum value of the difference between the actual pressure resistance value and the standard pressure resistance value measured after the initial test, ∆Fdmax is the preset maximum limit of the pressure resistance difference value, ∆Fg represents the maximum value of the actual pressure resistance value among the two sets of pressure-sensing pads 16 measured after the initial test, ∆Fgmax is the preset maximum limit of the pressure resistance value, ∆Fc represents the actual bearing pressure value measured after the initial test, ∆Fcmax is the preset maximum limit of the bearing pressure value; therefore , , The values ​​of each are in the range of [0, 1]. , , The weighting percentages for changes in actual pressure, actual pressure felt, and actual pressure bearing value after the initial test are respectively specified. ; Therefore in In this case, the value of D ranges from [0, 1]. Furthermore, when there is or or In any given scenario, D directly takes the value 1; When D is 0, it means that there is no risk of harmful deformation between test fixture 1 and workpiece 4 after the initial test, and the subsequent durability vibration test should be carried out directly. As D approaches 1, it indicates that the risk of harmful deformation between test fixture 1 and workpiece 4 is higher after the initial test. The user pre-sets the harmful deformation parameter d, where 0 < d < 1. When 0 ≤ D < d, the possibility of harmful deformation is ignored and the durability vibration test continues. When d < D ≤ 1, the risk of harmful deformation is high, and subsequent durability vibration tests will be suspended. The lower the value of d, the lower the risk. Through the above settings, the specific risk situation during the test can be accurately monitored, and the test efficiency can be guaranteed within the allowable risk range.

[0030] The sixth step is to perform a durability vibration test. Pre-set the vibration time and test vibration parameters in the three directions under the durability vibration test, and then start the durability vibration test.

[0031] Step 7: During the durability vibration test, conduct real-time fault monitoring. If a vibration fault occurs that is sufficient to affect the test results, immediately stop the test and proceed to step 8; otherwise, continue the test until the time limit is reached. In addition to abnormal vibration data, vibration faults can also include the occurrence of harmful deformation risks. It should be noted that a fault deformation parameter e can be set, and it is required that 0 < d < e < 1, because the possibility of fault deformation causing problems in test results is significantly greater than that of harmful deformation, and there is no possibility of error tolerance. For specific judgment methods, please refer to the above content.

[0032] Step 8: The vibration test is completed. The user retrieves the test results from the control terminal, thus completing the vibration test procedure for the new type of wind turbine vibration reduction structure.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A performance test device for a new fan vibration reduction structure, comprising a test tool (1), characterized in that: The test fixture (1) is connected to a workpiece (4) by a thread. The workpiece (4) includes a test piece and a test piece. The bottom of the test fixture (1) is connected to a test bench (2) by a thread. A vibration source group (3) is connected to the bottom of the test bench (2). A first sensing unit (5) is fixedly installed on the side of the upper surface of the test bench (2). A second sensing unit (6) is fixedly installed on the side of the top of the workpiece (4). A control terminal is provided on the outside of the test bench (2). The control terminal is connected to the vibration source group (3), the first sensing unit (5), and the second sensing unit (6) by a signal. The test specimen consists of a cover plate (41), an outer cover (42), a side plate (43), multiple sets of connecting parts (44), and a simulated weight-adding part (46). The test specimen consists of multiple sets of foot pieces (45). The test fixture (1) includes a base (11), two sets of protrusions (13), multiple sets of fixing nuts (14), and a support base (15). The support base (15) is divided into an upper ring, a lower ring, and a bottom plate. The base (11) has an installation groove at the position corresponding to the bottom of the simulated weight-adding part (46). The inner wall of the upper ring of the support base (15) is relatively embedded. A set of pressure-sensitive pads (16) are installed in the recess. A third sensor (7) is connected to the side of the pressure-sensitive pads (16) away from the inside of the support base (15). Simulation support sources (18) are evenly arranged on the inner wall of the lower ring of the support base (15). The bottom plate of the support base (15) passes through the inside of the mounting groove and a set of telescopic cylinders (17) are evenly fixed on the bottom surface of the bottom plate. The output end of the telescopic cylinder (17) is fixedly connected to the bottom plate to complete various simulated support states. A fourth sensor (8) is embedded in the bottom plate of the support base (15).

2. The performance test device for the new fan vibration reduction structure according to claim 1, characterized in that: The cover plate (41) is fixedly connected to the top of the outer cover (42), the second sensing part (6) is fixedly installed on one side of the top of the cover plate (41), the imitation weight-adding part (46) is fixed inside the outer cover (42), the imitation weight-adding part (46) is composed of a fan-shaped upper part and a cylindrical lower part, the cylindrical lower part protrudes from the bottom of the outer cover (42), and the side plate (43) and the bottom side of the outer cover (42) are integrally formed. The number and position of the multiple sets of connectors (44) and the multiple sets of anchors (45) are consistent. The top side of the anchor (45) is fastened to the top of the connector (44) by bolts, and the bottom side of the connector (44) is fastened to the side plate (43) by bolts. The height of the horizontal plane where the top surface of the anchor (45) is located is higher than the height of the horizontal plane where the top surface of the side plate (43) is located.

3. The performance test device for the new fan vibration reduction structure according to claim 2, characterized in that: The two sets of protrusions (13) are fixed parallel to each other on both sides of the upper surface of the base (11) and distributed on the outside of the imitation weight-adding part (46). The upper surface of the protrusions (13) is fastened to the middle of the bottom surface of the foot piece (45) by bolts. The multiple sets of fixing nuts (14) are used to fasten the connecting piece (44) and the side plate (43). The support base (15) is set to be open on the side facing the workpiece (4) and hollow inside.

4. The performance testing device for a novel wind turbine vibration reduction structure according to claim 3, characterized in that: The simulated support source (18) includes a support side plate (181), a telescopic rod (182), and a receiving groove (183). The side surface of the support side plate (181) facing the inside of the support base (15) is rounded. The support side plate (181) is slidably connected to the inside of the receiving groove (183). The telescopic rod (182) includes an outer rod fixedly installed inside the support side plate (181), an inner rod slidably connected inside the outer rod, and a spring fixedly connected between the inner rod and the outer rod. The other side of the inner rod is fixed to the inner wall of the receiving groove (183).

5. The performance testing device for a novel wind turbine vibration reduction structure according to claim 4, characterized in that: The fourth sensing unit (8) is connected to the control terminal signal and the signal input terminal of the fourth sensing unit (8) is fixedly connected to the inner support plate (19). The inner support plate (19) is located below the lower ring of the support base (15).

6. The performance testing device for a novel wind turbine vibration reduction structure according to claim 5, characterized in that: The base (11) has locking holes (12) arranged in an array on its side. The locking holes (12) are screwed with locking nuts (121). The lower half of the locking nuts (121) is locked to the surface of the test bench (2). A locking component (9) is provided on one side of the locking holes (12). The locking component (9) is composed of an upper horizontal plate, a vertical plate and a lower horizontal plate. The lower horizontal plate is fastened to the test bench (2) by bolts. The upper horizontal plate abuts against the upper surface of the base (11) at the location of the locking holes (12). The upper horizontal plate is connected to a fifth sensing unit (10) through and fixedly connected directly above the locking holes (12). The detection end of the fifth sensing unit (10) is in contact with the top surface of the locking nuts (121). The top surface of the locking nuts (121) is set as a plane.

7. A performance testing method for a novel wind turbine vibration damping structure, implemented based on the performance testing apparatus for a novel wind turbine vibration damping structure as described in claim 6, characterized in that: include: The first step is to install the test fixture (1) onto the test bench (2), and the locking parts (9) further limit the installation position of the test fixture (1) according to their respective locking holes (12); The second step is to install the workpiece (4) onto the test fixture (1), and the first sensor (5) and the second sensor (6) are fastened to the preset measuring points. The control terminal is used to receive the feedback vibration data. The third step is to determine the simulated support state of the workpiece (4) by using the positional relationship between the support base (15) and the imitation weight-adding part (46); In the fourth step, after determining the simulated support state of the workpiece (4), the first sensor (5) and the second sensor (6) perform data calibration, and the third sensor (7), the fourth sensor (8) and the fifth sensor (10) provide corresponding pressure data feedback. The fifth step involves conducting preliminary tests of random vibration in three directions, sinusoidal frequency sweep, and flat spectrum in sequence. After the tests, it is determined whether there is a risk of harmful deformation. If there is a risk of harmful deformation, the subsequent durability vibration test is suspended, and the test proceeds to the eighth step. If there is no risk of harmful deformation, the durability vibration test continues. Step 6: Perform the durability vibration test. Pre-set the vibration time and test vibration parameters in the three directions under the durability vibration test, and then start the durability vibration test. Step 7: During the durability vibration test, conduct real-time fault monitoring. If a vibration fault occurs that is sufficient to affect the test results, immediately stop the test and proceed to step 8; otherwise, continue the test until the time limit is reached. Step 8: The vibration test is complete, and the user retrieves the test results from the control terminal.

8. The performance testing method for a novel wind turbine vibration reduction structure according to claim 7, characterized in that: The specific content of the first step is as follows: After completing the overall installation of the test fixture (1) and the locking component (9), the detection end of the fifth sensor (10) abuts against the top surface of the locking nut (121) and obtains the pressure value. The standard pressure value is preset. During the locking process of the locking component (9), the pressure values ​​Fd of all the fifth sensors (10) are required to reach the standard pressure value Fd0, which is the initial locking state of the test fixture (1). The pressure value represented by each fifth sensor (10) is recorded as Fd. i i is an integer between 1 and n, where n is the total number of locking parts (9) or fifth sensing parts (10), and i represents the marking number of the locking parts (9) or fifth sensing parts (10); when in the initial locking state, Fd i It equals Fd0.

9. A performance testing method for a novel wind turbine vibration reduction structure according to claim 8, characterized in that: The simulated support state in the third step includes: Simulated support state 1: The telescopic cylinder (17) is in the initial state and the imitation weight-adding component (46) is located above the upper ring of the support base (15). In this state, the pressure values ​​Fg1 and Fg2 of the two sets of pressure-sensitive pads (16) are both 0. Simulated support state 2: The telescopic cylinder (17) drives the support base (15) to rise and the imitation weight-adding part (46) is located in the upper ring of the support base (15). The side wall of the imitation weight-adding part (46) does not apply pressure to the pressure-sensitive pad (16), that is, the pressure values ​​Fg1 and Fg2 of the two sets of pressure-sensitive pads (16) are both 0. Simulated support state three: The telescopic cylinder (17) drives the support base (15) to rise and the imitation weight-adding part (46) is located in the lower ring of the support base (15). The imitation support source (18) provides uniform support to the side wall of the imitation weight-adding part (46) and the side wall of the imitation weight-adding part (46) does not apply pressure to the pressure-sensitive pad (16). That is, the pressure values ​​Fg1 and Fg2 of the two sets of pressure-sensitive pads (16) are both 0. Simulated support state four: The telescopic cylinder (17) drives the support seat (15) to rise, imitating the support source (18) to support the side wall of the imitation weight-adding part (46), and the bottom plate of the support seat (15) and the bottom of the imitation weight-adding part (46) press against each other. The pressure values ​​Fg1 and Fg2 of the two sets of pressure-sensitive pads (16) are both 0. The pressure value measured by the fourth sensor (8) is recorded as Fc. The pressure value Fc is required to reach the standard pressure value Fc0.

10. A performance testing method for a novel wind turbine vibration reduction structure according to claim 8, characterized in that: The fifth step involves determining harmful deformation, specifically establishing a harmful deformation prediction formula D: ; The above formula requires ; ∆Fd represents the maximum value of the difference between the actual pressure resistance value and the standard pressure resistance value measured after the initial test, ∆Fdmax is the maximum limit of the pressure resistance difference value set in advance, ∆Fg represents the maximum value of the actual pressure resistance value among the two sets of pressure-sensitive pads (16) measured after the initial test, ∆Fgmax is the maximum limit of the pressure resistance value set in advance, ∆Fc represents the actual bearing pressure value measured after the initial test, ∆Fcmax is the maximum limit of the bearing pressure value set in advance; therefore , , The values ​​of each are in the range of [0, 1]. , , The weighting percentages for changes in actual pressure, actual pressure felt, and actual pressure bearing value after the initial test are respectively specified. ; Therefore in In this case, the value of D ranges from [0, 1]. Furthermore, when there is or or In any given scenario, D directly takes the value 1; When D is 0, it means that there is no risk of harmful deformation between the test fixture (1) and the workpiece (4) after the initial test, and the subsequent durability vibration test should be carried out directly. When D approaches 1, it indicates that the risk of harmful deformation between the test fixture (1) and the workpiece (4) is higher after the initial test. The user pre-sets the harmful deformation parameter d, where 0 < d < 1. When 0 ≤ D < d, the possibility of harmful deformation is ignored and the durability vibration test continues. When d < D ≤ 1, the risk of harmful deformation is high, and the subsequent durability vibration test will be suspended.

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