Blade high-frequency vibration testing device and blade high-frequency vibration testing system

Abstract

The invention relates to the technical field of vibration fatigue tests, in particular to a blade high-frequency vibration testing device and a blade high-frequency vibration testing system. A blade high-frequency vibration testing device in the blade high-frequency vibration testing system comprises a high-frequency piezoelectric excitation assembly, connecting pieces, a clamping assembly and a counterweight assembly, the high-frequency piezoelectric excitation assembly is used for driving a blade to vibrate at the frequency within a preset range, and the connecting pieces are arranged at the two ends of the high-frequency piezoelectric excitation assembly in the vibration direction correspondingly; any one of the two connecting pieces is connected with the clamping assembly, the other connecting piece is connected with the balance weight assembly, the clamping assembly is used for clamping and fixing the blade, the balance weight assembly comprises a first balance weight piece and a second balance weight piece which are detachably fixed, and the mass of the first balance weight piece and the mass of the second balance weight piece can be adjusted in an equivalent progressive increase or equivalent progressive decrease mode. The progressive increase value or the progressive decrease value of the first counterweight is smaller than the progressive increase value or the progressive decrease value of the second counterweight, so that different test requirements are met, and the applicability is improved.

Description

Technical Field

[0001] This invention relates to the field of vibration fatigue testing technology, and in particular to a blade high-frequency vibration testing device and a blade high-frequency vibration testing system. Background Technology

[0002] As researchers continue to study the fatigue life of engine blades, they have discovered that high-frequency stress has a significant impact on the fatigue life of engine blades. The effect of high-frequency vibration on the fatigue limit of blades is particularly pronounced. Generally speaking, the fatigue limit of blades under high-frequency vibration is significantly lower than that under low-frequency vibration, thus causing them to enter the fatigue failure stage earlier.

[0003] The impact of high-frequency vibration on blade fatigue life is mainly manifested in accelerated fatigue damage, intensified crack propagation, localized fatigue caused by stress concentration, and thermo-mechanical coupling effects. To extend blade service life, effective high-frequency vibration research is needed to develop reasonable fatigue life prediction models, optimize blade material and structural design, and address the destructive effects of high-frequency vibration. Furthermore, due to differences in resonant frequencies between different orders of the same blade and between different blades of the same order, the resonant frequency of the power source used to drive blade vibration needs to be rapidly adjusted during experiments to meet varying resonant excitation requirements.

[0004] Therefore, there is an urgent need to invent a high-frequency vibration testing device and a blade high-frequency vibration testing system to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a high-frequency vibration testing device and a blade high-frequency vibration testing system, so as to meet different testing requirements under high-frequency vibration conditions by adjusting the mass of the counterweight structure and adjusting the vibration frequency of the blade driven by the high-frequency piezoelectric excitation component.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The blade high-frequency vibration testing device includes:

[0008] A high-frequency piezoelectric excitation assembly is used to drive blades to vibrate at frequencies within a preset range.

[0009] The high-frequency piezoelectric excitation assembly includes a connector, a clamping assembly, and a counterweight assembly. The connector is provided at both ends along the vibration direction. One of the two connectors is connected to the clamping assembly, and the other is connected to the counterweight assembly.

[0010] The clamping assembly is used to clamp and fix the blade;

[0011] The counterweight assembly includes a detachable and fixed first counterweight and a second counterweight. The mass of the first counterweight and the second counterweight can be adjusted by increasing or decreasing the mass by the same amount. The increase or decrease value of the first counterweight is less than the increase or decrease value of the second counterweight.

[0012] As an optional solution, the high-frequency piezoelectric excitation assembly includes:

[0013] At least three piezoelectric ceramic sheets are stacked sequentially along the vibration direction, and the piezoelectric ceramic sheets located at both ends of the vibration direction are respectively connected to the connector.

[0014] Leads and a power supply, wherein the leads are configured to connect all the piezoelectric ceramic sheets in parallel and to the power supply.

[0015] As an optional solution, each piezoelectric ceramic sheet has two exposed electrode areas on its outer peripheral wall. One of the two exposed electrode areas is positive and the other is negative. Each piezoelectric ceramic sheet is also provided with a marking point, which is located next to the exposed electrode area with positive polarity or next to the exposed electrode area with negative polarity.

[0016] As an optional solution, the outer surface of the exposed electrode area is coated with a conductive silver layer, and the lead is welded and fixed to the conductive silver layer.

[0017] As an optional solution, the high-frequency piezoelectric excitation assembly further includes:

[0018] The locking rod is provided with a first through hole extending along the vibration direction of the piezoelectric ceramic sheet. The locking rod is housed in a plurality of the first through holes, and the axial ends of the locking rod extend out of the outer end faces of the first through holes located at both ends of the vibration direction of all the piezoelectric ceramic sheets. The connector is provided with a threaded through hole, and the axial ends of the locking rod are respectively threadedly fixed to the threaded through hole of the connector.

[0019] As an optional solution, the outer peripheral wall of the connector is provided with a first gripping groove.

[0020] As an optional feature, the preset range is 5kHz to 20kHz.

[0021] As an optional solution, the clamping assembly includes:

[0022] Two opposing grippers, with the blade disposed between the two opposing grippers; and

[0023] A clamping drive is connected to the connecting member. The output end of the clamping drive is connected to two opposing grippers. The clamping drive can drive the two opposing grippers to move relative to each other or away from each other.

[0024] Alternatively, the connector can be detachably fixed to the clamping assembly, and the connector can be detachably fixed to the counterweight assembly.

[0025] A high-frequency vibration testing system for blades includes a laser vibration measuring device, a control device, a power amplifier device, and the high-frequency vibration testing device for blades as described above. The laser vibration measuring device is used to detect the vibration state of the blade. The laser vibration measuring device is communicatively connected to the control device, and the control device is communicatively connected to the power amplifier device. The laser vibration measuring device can transmit detection information to the control device. The control device sends an electrical signal to the power amplifier device according to the detection information. The power amplifier device is used to drive the high-frequency piezoelectric excitation assembly.

[0026] The beneficial effects of this invention are:

[0027] The high-frequency vibration testing device for blades provided by this invention uses connecting members at both ends of a high-frequency piezoelectric excitation assembly along the vibration direction. One of these connecting members is connected to a clamping assembly, and the other is connected to a counterweight assembly. The clamping assembly holds the blade. The natural frequency of the two-degree-of-freedom system within the high-frequency piezoelectric base testing device is an inherent property, affected only by the system's mass and stiffness. By enabling the high-frequency piezoelectric excitation assembly to drive the blade to vibrate within a preset frequency range, the natural frequency of the two-degree-of-freedom system is adjusted from a stiffness perspective. Furthermore, by configuring the counterweight assembly as a first and second counterweight that can be detachably fixed together, and ensuring that the masses of both the first and second counterweights can be adjusted by equal increments or decreases, the natural frequency of the two-degree-of-freedom system is adjusted from a mass perspective, thus meeting different testing requirements for blades and improving applicability. Furthermore, since the increment or decrement value of the first counterweight is smaller than that of the second counterweight, when the mass of the counterweight assembly needs to be adjusted within a larger range, the mass of the second counterweight can be adjusted quickly. When the mass of the counterweight assembly needs to be adjusted within a higher precision range, the mass of the first counterweight can be adjusted quickly. This improves both the mass adjustment range and the mass adjustment precision of the counterweight assembly, further meeting different testing needs and enhancing applicability.

[0028] The present invention also provides a blade high-frequency vibration testing system. By applying the above-mentioned blade high-frequency vibration testing device, the vibration natural frequency of the two-degree-of-freedom system composed of the blade and the high-frequency piezoelectric base testing device can be adjusted from the aspects of mass and stiffness, respectively, to meet different testing requirements and has a wide range of applications. Attached Figure Description

[0029] Figure 1 This is a first schematic diagram of the high-frequency vibration testing device for blades and the blade provided in Embodiment 1 of the present invention;

[0030] Figure 2 This is a second schematic diagram of the high-frequency vibration testing device for blades and the blade provided in Embodiment 1 of the present invention;

[0031] Figure 3 This is a first schematic diagram of the high-frequency piezoelectric vibration assembly provided in Embodiment 1 of the present invention;

[0032] Figure 4 This is a second schematic diagram of the high-frequency piezoelectric vibration assembly provided in Embodiment 1 of the present invention;

[0033] Figure 5 This is a third schematic diagram of the high-frequency piezoelectric vibration assembly provided in Embodiment 1 of the present invention;

[0034] Figure 6 This is a first schematic diagram of the high-frequency vibration testing device for blades and the blade provided in Embodiment 2 of the present invention;

[0035] Figure 7 This is a second schematic diagram of the high-frequency vibration testing device for blades and the blade provided in Embodiment 2 of the present invention;

[0036] Figure 8 This is a first schematic diagram of the high-frequency vibration testing device for blades and the blade provided in Embodiment 3 of the present invention;

[0037] Figure 9 This is a second schematic diagram of the high-frequency vibration testing device for blades and the blade provided in Embodiment 3 of the present invention;

[0038] Figure 10 This is a schematic diagram of the blade high-frequency vibration testing system and blade provided in Embodiment 4 of the present invention.

[0039] In the picture:

[0040] 100. High-frequency piezoelectric excitation assembly; 110. Piezoelectric ceramic sheet; 111. Exposed electrode area; 112. Identification point; 113. First through hole; 120. Lead wire;

[0041] 200. Connector; 210. First gripping groove;

[0042] 300. Clamping assembly;

[0043] 400, counterweight assembly; 410, first counterweight; 420, second counterweight; 421, second gripping groove;

[0044] 2000, blades;

[0045] 3000, Laser vibration measurement device;

[0046] 4000, Control device;

[0047] 5000, Power Amplifier. Detailed Implementation

[0048] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0049] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0052] Example 1

[0053] The impact of high-frequency vibration on blade fatigue life is mainly manifested in accelerated fatigue damage, intensified crack propagation, localized fatigue caused by stress concentration, and thermo-mechanical coupling effects. To extend blade service life, effective high-frequency vibration research is needed to develop reasonable fatigue life prediction models, optimize blade material and structural design, and address the destructive effects of high-frequency vibration. Furthermore, due to differences in resonant frequencies between different orders of the same blade and between different blades of the same order, the resonant frequency of the power source used to drive blade vibration needs to be rapidly adjusted during experiments to meet varying resonant excitation requirements.

[0054] To solve the above problems, such as Figure 1 and Figure 2 As shown, this embodiment provides a blade high-frequency vibration testing device. The blade high-frequency vibration testing device includes a high-frequency piezoelectric excitation assembly 100, connecting members 200, a clamping assembly 300, and a counterweight assembly 400. The high-frequency piezoelectric excitation assembly 100 drives the blade 2000 to vibrate at a frequency within a preset range. Connecting members 200 are respectively provided at both ends of the high-frequency piezoelectric excitation assembly 100 along the vibration direction. Either connecting member 200 is connected to the clamping assembly 300, and the other is connected to the counterweight assembly 400. The clamping assembly 300 is used to clamp and fix the blade 2000. The counterweight assembly 400 includes a detachably fixed first counterweight 410 and a second counterweight 420. The mass of the first counterweight 410 and the second counterweight 420 increases or decreases by an equal amount, and the increase or decrease value of the first counterweight 410 is less than the increase or decrease value of the second counterweight 420.

[0055] This high-frequency vibration testing device for blades uses connecting members 200 at both ends of the high-frequency piezoelectric excitation assembly 100 along the vibration direction. One of the connecting members 200 is connected to a clamping assembly 300, and the other is connected to a counterweight assembly 400. The clamping assembly 300 holds the blade 2000. The natural frequency of the two-degree-of-freedom system within the high-frequency piezoelectric base testing device is an inherent property, affected only by the system's mass and stiffness. By enabling the high-frequency piezoelectric excitation assembly 100 to drive the blade 2000 to vibrate within a preset frequency range, the natural frequency of the two-degree-of-freedom system is adjusted from the perspective of stiffness. Furthermore, by configuring the counterweight assembly 400 as a first counterweight 410 and a second counterweight 420 that are detachably fixed together, and ensuring that the masses of both the first and second counterweights can be adjusted by equal increments or decreases, the natural frequency of the two-degree-of-freedom system is adjusted from the perspective of mass, thus meeting different testing requirements for the blade 2000 and improving its applicability. Furthermore, since the increment or decrement value of the first counterweight 410 is less than that of the second counterweight 420, when the mass of the counterweight assembly 400 needs to be adjusted within a larger range, the mass of the second counterweight 420 can be adjusted quickly. When the mass of the counterweight assembly 400 needs to be adjusted within a higher precision range, the mass of the first counterweight 410 can be adjusted quickly. This improves both the mass adjustment range and the mass adjustment precision of the counterweight assembly 400, further meeting different testing needs and enhancing its applicability.

[0056] In this embodiment, the preset range is 5kHz to 20kHz. Conventional blade vibration testing devices can only perform tests in the range below 10kHz, and cannot test the blade 2000 under high-frequency vibration conditions. The high-frequency piezoelectric excitation component 100 provided in this embodiment can drive the blade 2000 to vibrate at frequencies from 5kHz to 20kHz, achieving true high-frequency excitation of the blade 2000, and can be applied to various occasions such as blade 2000 vibration fatigue life testing, vibration characteristic testing, and vibration stress distribution testing.

[0057] Combination Figure 3 and Figure 4The specific structure of the high-frequency piezoelectric vibration assembly 100 is described below. The high-frequency piezoelectric vibration assembly 100 includes at least three piezoelectric ceramic sheets 110, leads 120, and a power supply (not shown in the figure). All the piezoelectric ceramic sheets 110 are stacked sequentially along the vibration direction. The piezoelectric ceramic sheets 110 located at both ends of the vibration direction are connected to the connector 200. The leads 120 are configured to connect all the piezoelectric ceramic sheets 110 in parallel and are connected to the power supply. By setting at least three piezoelectric ceramic sheets 110, stacking them sequentially along the vibration direction, and connecting them in parallel with the power supply using the leads 120, the power supply drives all the piezoelectric ceramic sheets 110 to work synchronously, improving the vibration effect on the blade 2000. It should be noted that in this embodiment, the high-frequency piezoelectric vibration assembly 100 has three piezoelectric ceramic sheets 110. In other embodiments, the specific number of piezoelectric ceramic sheets 110 can be adjusted according to actual needs; this embodiment does not impose a specific limitation.

[0058] Specifically, each piezoelectric ceramic sheet 110 has two exposed electrode areas 111 on its outer peripheral wall. One of the exposed electrode areas 111 is positive, and the other is negative. Each piezoelectric ceramic sheet 110 also has a marking point 112, which is located next to either the positive or negative exposed electrode area 111. By placing the marking point 112 next to either the positive or negative exposed electrode area 111, it is easier for operators to distinguish between the positive and negative electrodes of the piezoelectric ceramic sheet 110, ensuring that operators can correctly connect the piezoelectric ceramic sheet 110 using the lead wire 120. This not only improves the protection of the piezoelectric ceramic sheet 110 but also improves the parallel connection efficiency of the piezoelectric ceramic sheet 110. It should be noted that in this embodiment, the marking points 112 are all located next to the exposed electrode area 111 with positive polarity. In other embodiments, the marking points 112 may also be located next to the exposed electrode area 111 with negative polarity; this embodiment does not impose any specific limitation. Furthermore, the specific structure and working principle of the piezoelectric ceramic sheet 110 are existing technologies and will not be described in detail here.

[0059] In this embodiment, the outer surface of the exposed electrode area 111 is coated with a conductive silver layer, and the lead wire 120 is soldered to the conductive silver layer. By coating the outer surface of the exposed electrode area 111 with a conductive silver layer and soldering the lead wire 120 to the conductive silver layer, the fixation effect between the lead wire 120 and the exposed electrode area 111 can be guaranteed.

[0060] To further improve the conductivity of lead 120, in this embodiment, the soldering material includes solder paste and flux, and the solder paste contains metallic silver; lead 120 is made of copper. In other embodiments, lead 120 may also be made of other conventional metal materials with conductive properties; this embodiment does not impose specific limitations.

[0061] In one of the alternative solutions, such as Figure 3 As shown, the high-frequency piezoelectric excitation assembly 100 also includes a locking rod (not shown in the figure). The piezoelectric ceramic sheet 110 is provided with a first through hole 113 extending along the vibration direction. The locking rod is accommodated in a plurality of first through holes 113, and the axial ends of the locking rod extend out of the outer end faces of the first through holes 113 located at both ends of the vibration direction of all the piezoelectric ceramic sheets 110. The connector 200 is provided with a threaded through hole (not shown in the figure), and the axial ends of the locking rod are threadedly fixed to the threaded through hole of the connector 200. By providing a first through hole 113 extending along the vibration direction in the piezoelectric ceramic sheet 110, and setting a locking rod in multiple first through holes 113, the axial ends of the locking rod extend out of the outer end faces of the first through holes 113 at both ends of the piezoelectric ceramic sheet 110 in the vibration direction. Threaded through holes are also provided on the connector 200, and the axial ends of the locking rod are threadedly fixed to the threaded through holes of the connector 200. This allows the two connectors 200 to clamp and fix all the piezoelectric ceramic sheets 110 along the vibration direction, further improving the driving effect of the high-frequency piezoelectric excitation assembly 100 on the blade 2000.

[0062] For example, 3~ Figure 5 As shown, in this embodiment, the axial length of a single piezoelectric ceramic sheet 110 is 10 mm. Three piezoelectric ceramic sheets 110 are stacked in a cylindrical structure along the vibration direction, and two exposed electrode areas 111 are arranged opposite each other on the outer peripheral wall of the cylindrical structure. The outer diameter of the cylindrical structure, i.e., the outer diameter of the piezoelectric ceramic sheet 110, is φ1, which is 20 mm; the inner diameter of the cylindrical structure, i.e., the diameter of the first through hole 113 in the piezoelectric ceramic sheet 110, is φ2, which is 12 mm; when the lead wire 120 is welded and fixed to the conductive silver layer on the exposed electrode area 111, the diameter of the cylindrical structure with the lead wire 120 is D1, which is 15 mm.

[0063] To ensure the normal driving of the blade 2000 by the high-frequency piezoelectric excitation assembly 100, it is necessary to ensure that the force generated by the expansion and contraction of the piezoelectric ceramic sheet 110 during operation can drive the blade 2000 to move. Furthermore, the magnitude of the force generated by the expansion and contraction of the piezoelectric ceramic sheet 110 is proportional to the specifications of the piezoelectric ceramic sheet 110. Therefore, the outer diameter of the piezoelectric ceramic sheet 110 and the diameter of the first through hole 113 are proportional to the mass of the blade 2000. In actual testing, the outer diameter of the piezoelectric ceramic sheet 110 and the diameter of the first through hole 113 can be adaptively adjusted according to the specific mass of the blade 2000 to ensure the normal operation of the high-frequency piezoelectric excitation assembly 100. This embodiment does not impose specific limitations.

[0064] In addition, when welding and fixing the lead 120 to the conductive silver layer, it is also necessary to adjust the diameter D1 of the cylindrical structure with the lead 120 accordingly to avoid excessive welding slag at the welding position during the welding process, which would cause the diameter D1 of the cylindrical structure with the lead 120 to be too large, so as to ensure the structural compactness and aesthetics of the subsequent high-frequency piezoelectric excitation assembly 100.

[0065] To further facilitate the threaded fastening of the connector 200 and the locking rod, a first gripping groove 210 is provided on the outer peripheral wall of the connector 200. When it is necessary to screw the connector 200 relative to the locking rod, the operator can place their fingers in the first gripping groove 210 to facilitate screwing the connector 200.

[0066] As an optional solution, the connector 200 can be detachably fixed to the clamping assembly 300, and the connector 200 can be detachably fixed to the counterweight assembly 400. By detachably fixing the connector 200 to the clamping assembly 300 and the counterweight assembly 400 respectively, when it is necessary to inspect or maintain the connector 200, the clamping assembly 300 or the counterweight assembly 400 in the future, the connector 200, the clamping assembly 300 or the counterweight assembly 400 can be disassembled individually, reducing the difficulty of subsequent inspection and maintenance.

[0067] In one optional embodiment, the clamping assembly 300 includes a clamping drive (not shown in the figure) and two opposing grippers (not shown in the figure). The blade 2000 is positioned between the two opposing grippers. The clamping drive is detachably connected to the connecting member 200. The output ends of the clamping drive are connected to the two opposing grippers, respectively. The clamping drive can drive the two opposing grippers to move relative to each other or away from each other. By detachably connecting the clamping drive to the connecting member 200 and connecting the two opposing grippers to their output ends, the blade 2000 is positioned between the two opposing grippers. The clamping drive drives the two grippers to move relative to each other or away from each other, thus achieving the clamping and releasing of the blade 2000 by the two grippers. It should be noted that in this embodiment, the clamping drive is a double-headed cylinder, and the two grippers are respectively positioned at the two output ends of the double-headed cylinder. The double-headed cylinder is highly responsive, simple in structure, and easy to assemble and disassemble. In other embodiments, the clamping drive can also be any other structure capable of driving the two grippers to move relative to each other or in opposite directions; this embodiment does not impose any specific limitations.

[0068] Furthermore, in this embodiment, the clamping drive member and the connector 200 are fixed together by bolts, and the second counterweight 420 is fixed together with the connector 200 by bolts.

[0069] As an optional solution, the first counterweight 410 and the second counterweight 420 are threaded together. Specifically, the first counterweight 410 has a threaded protrusion, and the second counterweight 420 has a threaded groove, with the threaded protrusion and the threaded groove being threaded together. It should be noted that, in this embodiment, as... Figure 1 and Figure 2 As shown, the mass of the first counterweight 410 is 9g, and the mass of the second counterweight 420 is 360g. The increment or decrement of the first counterweight 410 is 1g, and the increment or decrement of the second counterweight 420 is 10g.

[0070] In addition, to improve the fixing efficiency of the first counterweight 410 and the second counterweight 420, a second gripping groove 421 is provided on the second counterweight 420. When screwing and fixing the first counterweight 410 and the second counterweight 420, the operator can place his / her fingers in the second gripping groove 421.

[0071] Example 2

[0072] like Figure 5 and Figure 6As shown, this embodiment provides a high-frequency piezoelectric vibration device. The specific structure of the high-frequency piezoelectric vibration device provided in this embodiment is basically the same as that in Embodiment 1. The differences between the specific structure of the high-frequency piezoelectric vibration device provided in this embodiment and Embodiment 1 are: the mass and increment or decrement value of the first counterweight 410 are different, and the mass and increment or decrement value of the second counterweight 420 are different.

[0073] Specifically, in this embodiment, the first counterweight 410 has a mass of 5g, and its increment or decrement is 0.5g; the second counterweight 420 has a mass of 150g, and its increment or decrement is 5g. The mass adjustment accuracy of the counterweight assembly 400 in the high-frequency piezoelectric vibration device provided in this embodiment is higher than that of the counterweight assembly 400 in the high-frequency piezoelectric vibration device provided in Embodiment 1.

[0074] Example 3

[0075] like Figure 7 and Figure 8 As shown, this embodiment provides a high-frequency piezoelectric vibration device. The specific structure of the high-frequency piezoelectric vibration device provided in this embodiment is basically the same as that in Embodiment 2. The differences between the specific structure of the high-frequency piezoelectric vibration device provided in this embodiment and Embodiment 2 are: the mass and increment or decrement value of the first counterweight 410 are different, and the mass and increment or decrement value of the second counterweight 420 are different.

[0076] Specifically, in this embodiment, the first counterweight 410 has a mass of 2g, and its increment or decrement is 0.1g; the second counterweight 420 has a mass of 80g, and its increment or decrement is 2g. The mass adjustment accuracy of the counterweight assembly 400 in the high-frequency piezoelectric vibration device provided in this embodiment is higher than that of the counterweight assembly 400 in the high-frequency piezoelectric vibration device provided in Embodiment 2.

[0077] It is understood that the specific mass and increment or decrement value of the first counterweight 410 and the specific mass and increment or decrement value of the second counterweight 420 in Embodiments 1 to 3 above are merely illustrative examples. In other embodiments, the specific mass and increment or decrement value of the first counterweight 410 and the specific mass and increment or decrement value of the second counterweight 420 can be adjusted according to actual needs, and this embodiment does not impose specific limitations.

[0078] Example 4

[0079] like Figure 9As shown, this embodiment provides a high-frequency vibration testing system for blades. The system includes a laser vibration measuring device 3000, a control device 4000, a power amplifier 5000, and the high-frequency vibration testing device for blades as described in Embodiments 1 to 3 above. The laser vibration measuring device 3000 is used to detect the vibration state of the blade 2000. The laser vibration measuring device 3000 is communicatively connected to the control device 4000, and the control device 4000 is communicatively connected to the power amplifier 5000. The laser vibration measuring device 3000 can transmit detection information to the control device 4000. The control device 4000 sends an electrical signal to the power amplifier 5000 based on the detection information. The power amplifier 5000 is used to drive the high-frequency piezoelectric excitation assembly 100.

[0080] Specifically, when the control device 4000 transmits an electrical signal to the power amplifier device 5000, the power amplifier device 5000 drives the high-frequency piezoelectric vibration excitation component 100 to work, causing the blade 2000 to be forced to resonate. The laser vibration measurement device 3000 collects the vibration state of the blade 2000 in real time without contact, that is, it collects the displacement vibration signal of the blade 2000 at a specified position. The laser vibration measurement device 3000 transmits the detection information to the control device 4000. The control device 4000 compares the detection information with the original correct information. If there is no difference between the two, the high-frequency piezoelectric vibration excitation component 100 is working normally. If there is a difference between the two, the generated difference is transmitted to the power amplifier device 5000 in real time via an electrical signal. After receiving the signal with the difference, the power amplifier device 5000 adjusts the vibration frequency of the high-frequency piezoelectric vibration excitation component 100 that drives the blade 2000, so that the entire blade high-frequency vibration test system is in a controlled negative feedback state. Ultimately, this high-frequency vibration testing system for blades will be able to be applied, and in accordance with the statistical method for vibration fatigue testing of blades 2000, batch testing and verification of vibration fatigue life, vibration characteristic analysis, or vibration stress distribution of blades 2000 will be carried out.

[0081] It should be noted that the specific structure and working principle of the laser vibration measuring device 3000, the control device 4000, and the power amplification device 5000 are all existing technologies, and will not be elaborated here for the sake of brevity.

[0082] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. Blade high frequency vibration test device, characterized in that: include: A high-frequency piezoelectric excitation component (100) is used to drive the blade (2000) to vibrate at a frequency within a preset range; A connecting member (200), a clamping assembly (300) and a counterweight assembly (400), wherein the connecting members (200) are respectively arranged at both ends of the high-frequency piezoelectric excitation assembly (100) along the vibration direction, and any one of the two connecting members (200) is connected to the clamping assembly (300), and the other is connected to the counterweight assembly (400); The clamping assembly (300) is used to clamp and fix the blade (2000); The counterweight assembly (400) comprises a first counterweight component (410) and a second counterweight component (420) which are detachably fixed, the masses of the first counterweight component (410) and the second counterweight component (420) can be adjusted by increasing or decreasing the same amount, and the increasing value or decreasing value of the first counterweight component (410) is smaller than the increasing value or decreasing value of the second counterweight component (420).

2. The blade high frequency vibration testing device according to claim 1, characterized in that: The high-frequency piezoelectric excitation component (100) comprises: At least three piezoelectric ceramic sheets (110), all of the piezoelectric ceramic sheets (110) are stacked in sequence along the vibration direction, and the piezoelectric ceramic sheets (110) located at both ends of the vibration direction among all of the piezoelectric ceramic sheets (110) are respectively connected to the connecting member (200); A lead wire (120) and a power source, wherein the lead wire (120) is configured to connect all the piezoelectric ceramic sheets (110) in parallel and communicate with the power source.

3. The blade high frequency vibration testing device according to claim 2, characterized in that: The outer peripheral wall of each piezoelectric ceramic sheet (110) is provided with two exposed electrode areas (111), one of the two exposed electrode areas (111) has a positive polarity and the other has a negative polarity. Each piezoelectric ceramic sheet (110) is also provided with an identification point (112), the identification point (112) is arranged next to the exposed electrode area (111) with a positive polarity, or the identification point (112) is arranged next to the exposed electrode area (111) with a negative polarity.

4. The blade high frequency vibration testing device according to claim 3, characterized in that: The outer surface of the exposed electrode region (111) is coated with a conductive silver layer, and the lead wire (120) is fixed to the conductive silver layer by welding.

5. The blade high frequency vibration testing device according to claim 2, characterized in that: The high-frequency piezoelectric excitation component (100) further comprises: A locking rod, the piezoelectric ceramic sheet (110) is provided with a first through hole (113) extending along the vibration direction, the locking rod is accommodated in a plurality of the first through holes (113), and the axial ends of the locking rod respectively extend along the vibration direction from the outer end surfaces of the first through holes (113) at both ends of the vibration direction in all the piezoelectric ceramic sheets (110), the connecting piece (200) is provided with a threaded through hole, and the axial ends of the locking rod are respectively threadedly fixed to the threaded through holes of the connecting piece (200).

6. The blade high frequency vibration testing device according to claim 5, characterized in that: The outer peripheral wall of the connecting piece (200) is provided with a first gripping groove (210).

7. The blade high frequency vibration testing device according to claim 1, characterized in that: The preset range is 5kHz to 20kHz.

8. The blade high frequency vibration testing device according to claim 1, characterized in that: The clamping assembly (300) comprises: Two clamping jaws arranged opposite to each other, the blade (2000) being arranged between the two clamping jaws arranged opposite to each other; and A clamping drive member, the clamping drive member is connected to the connecting member (200), the output ends of the clamping drive member are respectively connected to the two clamping jaws arranged opposite to each other, and the clamping drive member can drive the two clamping jaws arranged opposite to each other to move relative to each other or move away from each other.

9. The blade high frequency vibration testing device according to claim 1, characterized in that: The connecting member (200) and the clamping assembly (300) are detachably fixed, and the connecting member (200) and the counterweight assembly (400) are detachably fixed.

10. Blade high frequency vibration test system, characterized in that: The invention comprises a laser vibration measuring device (3000), a control device (4000), a power amplifying device (5000), and a blade high-frequency vibration testing device as claimed in any one of claims 1 to 9, wherein the laser vibration measuring device (3000) is used to detect the vibration state of the blade (2000), the laser vibration measuring device (3000) is communicatively connected to the control device (4000), the control device (4000) is communicatively connected to the power amplifying device (5000), the laser vibration measuring device (3000) can transmit detection information to the control device (4000), the control device (4000) transmits an electrical signal to the power amplifying device (5000) according to the detection information, and the power amplifying device (5000) is used to drive the high-frequency piezoelectric excitation component (100).

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