Device and method for testing abrasion of damping table of fan blade with damping table

Abstract

The device for testing the abrasion of the damping table of the fan blade with the damping table is suitable for a vibration abrasion test of a group of blades with damping table structures, the other side face of each blade and the corresponding position of the damping table structure are provided with an extending part, and the device comprises vibration equipment used for generating exciting force; the clamping assembly is partially installed on a vibration table of the vibration equipment and used for fixing one end of the blade and installing the other end of the blade in the mode that the blade can move relatively in the vertical direction, and mutual vibration abrasion between damping table structures on the blade is achieved in a contact mode. And the controller is in communication connection with the vibration equipment and controls the vibration equipment to generate different excitation forces in a frequency conversion manner, so that the test and detection efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation blade testing equipment, and in particular relates to a testing device and a testing method for wear of a damping platform of a fan blade with a damping platform. Background Art

[0002] The low-pressure I-stage working blades of a certain type of engine are blades with a damping platform structure. The purpose of this structural design is to reduce the vibration of the blades when the engine is working and to increase the service life of the blades. After the engine has been working for a long time, the blade damping platform will have varying degrees of wear. In order to reduce wear and ensure its structural strength, a special material is usually infiltrated into the contact position of the two blade damping platforms to form a certain thickness of infiltration layer. In order to verify the wear resistance of the treated blades, a vibration wear test is required. The traditional method uses a fixed frequency and a fixed excitation force for testing. The single frequency cannot better fit the actual working conditions of the blades, and the probability of defective products is high, and the test detection efficiency is low. Summary of the invention

[0003] In view of this, the present invention provides a fan blade damping platform wear test device with a damping platform, which solves the technical problem of low efficiency in blade detection in traditional methods.

[0004] A test device for the wear of a damping platform of a fan blade with a damping platform is suitable for a vibration wear test of a group of blades with a damping platform structure. The other side of the blade and the damping platform structure are provided with a protruding part at a corresponding position, including:

[0005] Vibration equipment for generating exciting forces;

[0006] A clamping assembly, partially mounted on a vibration table of the vibration equipment, is used to fix one end of the blade and to mount the other end of the blade in a relatively movable manner in a vertical direction, so as to achieve mutual vibration wear between the damping table structures on the blade in a contacting manner;

[0007] The controller is connected to the vibration device for controlling the vibration device to generate different exciting forces in a variable frequency manner.

[0008] Beneficial Effects

[0009] At present, there is no test method for damping table wear using a vibration table in China. The test method proposed in this patent uses a vibration table to carry out variable frequency random vibration, and uses the vibration table to provide a vibration source to simulate the vibration of the engine when it is working. At the same time, a fixture is designed to fix the test blade so that the working surfaces of the two blade damping tables are in contact with each other, and upper and lower support sliders are added to adjust the tightness of the contact surface. The vibration table outputs a random vibration with a broadband and a narrow band superimposed, which drives the two blades to vibrate randomly at the same time, and causes the contact surfaces of the two blade damping tables to rub against each other, so that the vibration wear on the tester is the same as the wear mechanism during actual work, which effectively verifies the wear resistance of the blade damping table and provides data support for the repair and process optimization of the damping table working surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0011] Figure 1 It is a schematic diagram of the structure of the present invention;

[0012] Figure 2 It is a schematic diagram of the system of the present invention;

[0013] Figure 3 is a schematic diagram of the vibration spectrum, where

[0014] 1. Controller; 2. Base; 21. Mounting block; 22. First groove; 23. Second groove; 24. First baffle; 25. Second baffle; 26. Arc surface; 3. Bottom plate; 4. Flat plate; 5. Support frame; 51. First support plate; 52. Second support plate; 53. First compression spring; 54. Second compression spring; 55. First moving block; 56. Second moving block; 6. Damping platform structure; 7. Extension; 8. Lifting ring. DETAILED DESCRIPTION

[0015] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0016] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0017] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0018] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The drawings only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0019] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, one skilled in the art will appreciate that aspects may be practiced without these specific details.

[0020] like Figures 1 to 3 The test device for the wear of the damping platform of the fan blade with the damping platform shown is suitable for the vibration wear test of a group of blades with the damping platform structure 6, generally, two blades. The other side of the blade is provided with a protruding portion 7 at a corresponding position with the damping platform structure 6, including:

[0021] Vibration equipment is used to generate exciting force. Generally, it vibrates for a standard time according to the design specifications. After vibration, it is tested whether the performance of the blade meets the standard. The exciting force is related to the frequency density value PSD.

[0022] The clamping assembly is partially mounted on the vibration table of the vibration equipment, and is used to fix one end of the blade, and to mount the other end of the blade in a relatively movable manner in the vertical direction, so as to achieve mutual vibration and wear between the damping platform structures 6 on the blades in a contact manner. Specifically, the clamping assembly includes a movable clamping assembly and a base 2, and the base 2 is mounted on the vibration table and a mounting block 21 is detachably mounted on the base 2, such as by using a bolt assembly for installation, as follows:

[0023] 1) Structure of mounting block 21

[0024] The first groove 22 and the second groove 23 are arranged at intervals on the side of the mounting block 21 facing the movable clamping assembly. The axis angle of the first groove 22 and the second groove 23 is an acute angle, for example, 5°-10°, and they are arranged in an inclined manner and the shape is adapted to the side size of one end of the blade. The first adjustment assembly is fixedly installed at one end of the first groove 22 and the second groove 23. The first adjustment assembly is used to adjust the position of the blade in the groove in the first direction. The other end of the first groove 22 and the second groove 23 is rotatably installed with a second adjustment assembly. The second adjustment assembly is used to adjust the position of the blade in the groove in the second direction. The directions of adjusting the blade position in the first direction and the second direction are opposite, and the adjustment is performed along the direction of the groove, and the adjustment direction is opposite. The first adjustment assembly includes a first baffle 24 and a bolt assembly respectively installed on the left side of the first groove 22 and the second groove 23. The two first baffles 24 are respectively installed on the left notch of the first groove 22 and the second groove 23. The bolt assembly is used to pass through the first groove 22 and the second groove 23 respectively. Therefore, the position in the first groove 22 and the second groove 23 can be adjusted by rotating the bolt assembly.

[0025] The second adjustment assembly includes a second baffle 25 and a bolt assembly. The second baffle 25 is installed on the right side of the first groove 22 and the second groove 23 by means of a pin or a rotating shaft, and the bolt assembly is used to pass through the first groove 22 and the second groove 23 respectively. The position of the blade can be adjusted by rotating the corresponding bolt assembly. Therefore, the positions of the two blades are adjusted by the first adjustment assembly and the second adjustment assembly to ensure that the respective damping platform structures 6 on the two blades can contact to meet the test requirements of contact friction.

[0026] Furthermore, the mounting block 21 is provided with an arc surface 26, and the first groove 22 and the second groove 23 are both provided on the arc surface 26. The arc surface 26 can increase the contact area between the first groove 22 and the second groove 23 and the blade to provide a stable clamping force, and the angles between the first groove 22 and the second groove 23 and the horizontal plane are both acute angles, and the height of one end of the first groove 22 and the second groove 23 in the vertical direction is greater than the height of the other end in the vertical direction, and the length of the first groove 22 and the second groove 23 is greater than the width of one end of the blade, so that the damping platform structures 6 on the two blades can be aligned. The first moving block 55 and the second moving block 56 mentioned above are both provided in a triangular structure, and their respective inclined surfaces are in contact with the corresponding extension 7 in a surface contact manner. Under the action of the two compression springs, force is transmitted to ensure that the damping platform structures 6 of the two blades can be in periodic friction contact to achieve an overall vibration friction test.

[0027] 2) The movable clamping assembly supports the blade in a manner that the blade can move relatively in the vertical direction. The movable clamping assembly includes a base plate 3 arranged adjacent to the vibration device. A support frame 5 is arranged at a position corresponding to the mounting block 21 on the base plate 3. The support frame 5 is provided with a first support plate 51 and a second support plate 52 spaced apart in the vertical direction. Specifically,

[0028] The bottom end of the support frame 5 is mounted on the bottom plate 3 in a movable or fixed manner through the flat plate 4 to improve the stability of the support frame 5. The movable manner, for example, is arranged in the form of a slide groove and a slide rail to ensure that the support frame 5 can be adjusted on the bottom plate 3.

[0029] The first support plate 51 and the second support plate 52 are both arranged in a "concave"-shaped structure. The first support plate 51 is installed at the top of the support frame 5, and the second support plate 52 is arranged near the bottom of the support frame 5 and the bottom surface contacts the top surface of the flat plate 4. The second support plate 52 is supported by the flat plate 4. Specifically,

[0030] The first support plate 51 is adjacent to one end of the mounting block 21, and is provided with a third groove at a position corresponding to the damping platform structure 6 on the blade, in which a first compression spring 53 is installed, and a first moving block 55 is installed at the free end of the first compression spring 53, and the first moving block 55 presses down a protruding portion 7 on a blade in a surface contact manner, and the maximum cross-sectional area of ​​the first moving block 55 is adapted to the cross-sectional area of ​​the third groove, and under the action of the vibration device, the first moving block 55 can reciprocate in the vertical direction;

[0031] The second support plate 52 is adjacent to one end of the mounting block 21 and is provided with a fourth groove at a position corresponding to the damping platform structure 6 on the blade. A second compression spring 54 is installed in the fourth groove. A second moving block 56 is installed at the free end of the second compression spring 54. The second moving block 56 supports the extension 7 on another blade in a surface contact manner. The maximum cross-sectional area of ​​the second moving block 56 is adapted to the cross-sectional area of ​​the fourth groove. Under the action of the vibration device, the second moving block 56 can reciprocate in the vertical direction.

[0032] The vibration equipment starts and outputs the exciting force in a variable frequency manner. Under the joint action of the first moving block 55 and the second moving block 56, the damping platform structure 6 on the two blades periodically contacts and rubs in the vertical direction to realize the vibration wear test of the two blades. Preferably, the top surface of the mounting block 21 and the top surface of the base plate 3 are both installed with a lifting ring 8 to facilitate the movement and lifting of the overall equipment.

[0033] Furthermore, the free ends of the two blades are limited by the damping platform limiter to ensure that the friction effect of the respective damping platform structures 6 in the vertical direction is better.

[0034] Secondly, a test method is provided, which uses the above-mentioned controller 1, which is connected to the vibration device for communication, and controls the vibration device to generate different exciting forces in a variable frequency manner. Preferably, the vibration device is controlled to generate different exciting forces in a variable frequency manner. Specifically,

[0035] Obtain the bending vibration mode, torsional vibration mode, dual bending vibration mode and compound bending-torsional vibration mode corresponding to the signals of standard blades of different models, which can be determined based on the bending and bending frequency tests;

[0036] According to the bending vibration mode, torsional vibration mode, two-bending vibration mode and compound bending-torsion vibration mode, the first-order vibration frequency, the second-order vibration frequency, the third-order vibration frequency and the fourth-order vibration frequency corresponding to each standard blade are determined, that is, the maximum frequency;

[0037] Determine the first-order vibration frequency, second-order vibration frequency, third-order vibration frequency and fourth-order vibration frequency corresponding to the current blade, and determine the first-order vibration narrowband, second-order vibration narrowband, third-order vibration narrowband and fourth-order vibration narrowband according to the first-order vibration frequency, second-order vibration frequency, third-order vibration narrowband and fourth-order vibration narrowband corresponding to the current blade model. The narrowband refers to the deviation of the upper blade amplitude, which is similar to the tolerance range. Generally, the deviation is plus or minus 5%. Determine the vibration spectrum of the current blade. The first-order vibration narrowband, second-order vibration narrowband, third-order vibration narrowband and fourth-order vibration narrowband are all within the range of the vibration spectrum. Generally, the vibration spectrum is selected as 1Hz-1000Hz;

[0038] The vibration frequency is randomly allocated within the range of the vibration spectrum, and is randomly allocated according to the military standard or the national standard, and the vibration test is performed according to the preset rules. The vibration spectrum includes a small power spectrum density, a first-order vibration narrow band, a second-order vibration narrow band, a third-order vibration narrow band and a fourth-order vibration narrow band. The excitation forces corresponding to the first-order vibration narrow band, the second-order vibration narrow band, the third-order vibration narrow band and the fourth-order vibration narrow band are the same, such as the excitation force corresponding to 1PSD, and the excitation forces corresponding to the frequencies under the small power spectrum density are the same, such as the excitation force corresponding to 0.03PSD. The initial vibration frequency is preferably 1HZ. The vibration test is performed according to the preset rules. Preferably,

[0039] At least one vibration frequency is allocated within each of the first-order vibration narrow band, the second-order vibration narrow band, the third-order vibration narrow band and the fourth-order vibration narrow band, wherein:

[0040] If the random frequency is the third vibration frequency corresponding to the third-order vibration narrow band, the first longest duration is assigned to perform the vibration test;

[0041] If the random frequency is the fourth vibration frequency corresponding to the fourth-order vibration narrow band, the second longest duration is allocated for the vibration test;

[0042] If the random frequency is the second vibration frequency corresponding to the second-order vibration narrow band, the third longest duration is allocated for the vibration test;

[0043] If the random frequency is the first vibration frequency corresponding to the first-order vibration narrow band, the third longest duration is allocated for the vibration test;

[0044] If the random frequency is within the range of small power spectrum density, the fourth longest duration is allocated for vibration test;

[0045] The first maximum duration is greater than the second maximum duration, the second maximum duration is greater than the third maximum duration, the third maximum duration is greater than the fourth maximum duration, and the first maximum duration, the second maximum duration, the third maximum duration and the fourth maximum duration are determined by allocating different coefficients to the total vibration duration of the current blade. For example, the first maximum duration is 30 minutes, the fourth maximum duration is less than 2 minutes, the second maximum duration and the third maximum duration are generally 10 minutes to 25 minutes, and the total vibration duration is determined according to the specifications.

[0046] This method uses a resonant vibration shape to perform a vibration simulation experiment, which is different from the traditional method of using a fixed frequency for a fixed duration of vibration. The present invention provides for the first time a vibration simulation using a fourth-order vibration frequency, which is more in line with the wear condition test of the blade in an actual working environment.

[0047] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A test device for the wear of a damping platform of a fan blade with a damping platform, which is suitable for a vibration wear test of a group of blades with a damping platform structure, wherein the other side of the blade and the damping platform structure are provided with a protruding portion at a corresponding position, and is characterized in that: include, Vibration equipment for generating exciting forces; A clamping assembly, partially mounted on a vibration table of the vibration equipment, is used to fix one end of the blade and to mount the other end of the blade in a relatively movable manner in a vertical direction, so as to achieve mutual vibration wear between the damping table structures on the blade in a contacting manner; The controller is connected to the vibration device for controlling the vibration device to generate different exciting forces in a variable frequency manner.

2. The test device according to claim 1, characterized in that: The clamping assembly comprises a movable clamping assembly and a base, wherein the base is mounted on the vibration table and a mounting block is detachably mounted on the base, wherein: A first groove and a second groove are arranged at intervals on the side of the mounting block facing the movable clamping assembly, the axis angle between the first groove and the second groove is an acute angle and the first groove and the second groove are arranged in an inclined manner and the shape is adapted to the side size of one end of the blade; A first adjustment component is fixedly mounted on one end of each of the first groove and the second groove, and the first adjustment component is used to adjust the position of the blade in the groove in the first direction; A second adjustment component is rotatably mounted on the other end of the first groove and the second groove, and the second adjustment component is used to adjust the position of the blade in the groove in a second direction, and the first direction and the second direction are opposite to each other in adjusting the blade position; The movable clamping assembly movably supports the blade in a manner that the blade can relatively move in a vertical direction.

3. The test device according to claim 2, characterized in that: The mounting block is provided with an arc surface, and the first groove and the second groove are both provided on the arc surface.

4. The test device according to claim 2, characterized in that: The included angles between the first groove and the second groove and the horizontal plane are both acute angles, and the height of one end of the first groove and the second groove in the vertical direction is greater than the height of the other end in the vertical direction.

5. The test device according to claim 2, characterized in that: The lengths of the first groove and the second groove are both greater than the width of one end of the blade.

6. The test device according to claim 2, characterized in that: The movable clamping assembly includes a bottom plate arranged adjacent to the vibration device, a support frame is arranged at a position on the bottom plate corresponding to the mounting block, and the support frame is provided with a first support plate and a second support plate spaced apart in a vertical direction, wherein: The bottom end of the support frame is movably mounted on the bottom plate through a flat plate to improve the stability of the support frame; The first support plate and the second support plate are both arranged in a "concave"-shaped structure, the first support plate is installed at the top of the support frame, the second support plate is arranged adjacent to the bottom of the support frame and the bottom surface contacts the top surface of the flat plate, and the second support plate is supported by the flat plate; The first support plate is adjacent to one end of the mounting block and is provided with a third groove at a position corresponding to the damping platform structure on the blade, a first compression spring is installed in the third groove, a first moving block is installed at the free end of the first compression spring, the first moving block presses down a protruding portion on a blade in a surface contact manner, the maximum cross-sectional area of ​​the first moving block is adapted to the cross-sectional area of ​​the third groove, and under the action of the vibration device, the first moving block can reciprocate in the vertical direction; The second support plate is adjacent to one end of the mounting block and is provided with a fourth groove at a position corresponding to the damping platform structure on the blade, a second compression spring is installed in the fourth groove, a second moving block is installed at the free end of the second compression spring, the second moving block supports the extension portion on the other blade in a surface contact manner, the maximum cross-sectional area of ​​the second moving block is adapted to the cross-sectional area of ​​the fourth groove, and under the action of the vibration device, the second moving block can reciprocate in the vertical direction; The vibration equipment starts and outputs exciting force in a variable frequency manner. Under the joint action of the first moving block and the second moving block, the damping platform structures on the two blades periodically contact and rub in the vertical direction to achieve a vibration wear test on the two blades.

7. The test device according to claim 5, characterized in that: The top surface of the mounting block and the top surface of the bottom plate are both equipped with lifting rings.

8. A test method, characterized in that: Using the test device according to any one of claims 1 to 7, wherein controlling the vibration device to generate different exciting forces in a variable frequency manner comprises: Obtain the bending vibration mode, torsional vibration mode, two-bending vibration mode and compound bending-torsional vibration mode corresponding to the signals of standard blades of different models; Determine the first-order vibration frequency, second-order vibration frequency, third-order vibration frequency and fourth-order vibration frequency corresponding to each standard blade according to the bending vibration mode, torsional vibration mode, two-bending vibration mode and compound bending-torsion vibration mode; Determine the first-order vibration frequency, second-order vibration frequency, third-order vibration frequency and fourth-order vibration frequency corresponding to the current blade; Determine the first-order vibration narrow band, the second-order vibration narrow band, the third-order vibration narrow band and the fourth-order vibration narrow band according to the first-order vibration frequency, the second-order vibration frequency, the third-order vibration narrow band and the fourth-order vibration narrow band corresponding to the current blade, and determine the vibration spectrum of the current blade, the first-order vibration narrow band, the second-order vibration narrow band, the third-order vibration narrow band and the fourth-order vibration narrow band are all within the range of the vibration spectrum; The vibration frequencies are randomly assigned within the range of the vibration spectrum, and the vibration test is performed according to a preset rule.

9. The test method according to claim 8, characterized in that The vibration spectrum includes a small power spectrum density, a first-order vibration narrow band, a second-order vibration narrow band, a third-order vibration narrow band and a fourth-order vibration narrow band, the exciting forces corresponding to the first-order vibration narrow band, the second-order vibration narrow band, the third-order vibration narrow band and the fourth-order vibration narrow band are all the same, the exciting forces corresponding to the frequencies under the small power spectrum density are all the same, and the vibration test is performed according to a preset rule, including: At least one vibration frequency is allocated within each of the first-order vibration narrowband, the second-order vibration narrowband, the third-order vibration narrowband and the fourth-order vibration narrowband, wherein: If the random frequency is the third vibration frequency corresponding to the third-order vibration narrow band, the first longest duration is assigned to perform the vibration test; If the random frequency is the fourth vibration frequency corresponding to the fourth-order vibration narrow band, the second longest duration is allocated for the vibration test; If the random frequency is the second vibration frequency corresponding to the second-order vibration narrow band, the third longest duration is allocated for the vibration test; If the random frequency is the first vibration frequency corresponding to the first-order vibration narrow band, the third longest duration is allocated to perform the vibration test; If the random frequency is within the range of small power spectrum density, the fourth longest duration is allocated for vibration test; The first longest duration is greater than the second longest duration, the second longest duration is greater than the third longest duration, the third longest duration is greater than the fourth longest duration, and the first longest duration, the second longest duration, the third longest duration and the fourth longest duration are determined by allocating different coefficients according to the total vibration duration of the current blade.

10. The test method according to claim 9, characterized in that: The first longest duration is 30 minutes, and the fourth longest duration is less than 2 minutes.

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