Non-contact blade modal parameter testing device and testing method

Abstract

The invention discloses a non-contact blade modal parameter testing device, comprising a test bench, a non-contact excitation head and a non-contact laser displacement measuring instrument; the test bench is provided with a mounting bracket for loading blades; the non-contact excitation head is installed on the test bench, and is used to apply excitation to the blades so that the blades vibrate under the action of the exciting force; the laser scanning head is installed on the test bench, and is used to test the blade shape coordinates and establish the blade three-dimensional entity; the non-contact laser displacement measuring instrument is installed on the test bench, and is used to collect the vibration signal on the blade and transmit it to the main control computer; the main control computer is used for system control and data management, and identifies the blade modal parameters according to the vibration signal of the blade; the non-contact excitation head, the non-contact laser displacement sensor, and the laser scanning head are controlled by the main control computer. The device uses the non-contact excitation head to apply excitation to the blades so that the blades vibrate, and has low cost and low energy consumption. The invention also provides a method for the above device.

Description

Technical Field

[0001] The present invention relates to the technical field of aerospace engine blade modal parameter testing, and more specifically, to a non-contact blade modal parameter testing device and a non-contact blade modal parameter testing method. Background Art

[0002] At present, the modal parameter test of aerospace engine blades is based on vibration testing and signal processing technology. The test requires the use of a large electromagnetic vibration table to apply external excitation, collect blade vibration signals through strain sensors, and determine the blade spectrum through FFT (Fast Fourier Transform) data analysis and use modal parameter identification technology to identify blade modal information. The entire measurement process needs to be carried out on a large electromagnetic vibration table, which provides vibration excitation to the blade. However, the electromagnetic vibration table has high procurement costs and high energy consumption.

[0003] In summary, how to reduce the equipment and energy consumption costs of blade modal parameter testing is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] In view of this, the present invention provides a non-contact blade modal parameter testing device, which uses a non-contact excitation head to apply excitation to the blade, so that the blade vibrates under the action of the exciting force, without the need for a vibration table, which can reduce procurement costs and energy consumption. The present invention also provides a non-contact blade modal parameter testing method, which is used in the above-mentioned testing device, without the need for a vibration table, which can reduce testing costs.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A non-contact blade modal parameter testing device, comprising:

[0007] A test bench, wherein the test bench is provided with a mounting bracket for loading the blades;

[0008] A non-contact excitation head, which is mounted on the test bench and is used to apply excitation to the blade so that the blade vibrates under the action of an exciting force;

[0009] A non-contact laser displacement measuring instrument, which is installed on the test bench and is used to collect vibration signals on the blade and transmit them to a main control computer; the main control computer is used to extract blade modal parameters according to the vibration signals of the blade;

[0010] The laser scanning head (non-contact 3D profiler) is used to test the 3D coordinates of the blade appearance in preparation for virtual test analysis;

[0011] Wherein, the non-contact excitation head is controlled by the main control computer.

[0012] Preferably, in the above-mentioned non-contact blade modal parameter testing device, the mounting bracket can adjust the posture of the blade.

[0013] Preferably, in the above-mentioned non-contact blade modal parameter testing device, the mounting bracket comprises:

[0014] a first drive motor, wherein the first drive motor is mounted on the test bench;

[0015] a first rotating platform, which is mounted at an output end of the first driving motor and can rotate around a first axis under the driving action of the first driving motor;

[0016] A second driving motor, the second driving motor is installed on the first rotating platform, and a second rotating platform is installed at the output end of the second driving motor; the second rotating platform can rotate around a second axis under the driving action of the second driving motor, and a blade clamp for clamping blades is provided on the second rotating platform.

[0017] Preferably, in the above-mentioned non-contact blade modal parameter testing device, the blade chuck comprises:

[0018] a mounting block, the mounting block being fixed on the second rotating platform;

[0019] A threaded push rod, the threaded push rod is installed at the threaded hole of the mounting block;

[0020] There are multiple threaded push rods, and each threaded push rod is used to tighten the installation tenon of the blade along different directions to achieve clamping of the blade.

[0021] Preferably, in the above-mentioned non-contact blade modal parameter testing device, a support frame is provided on the test bench, and the non-contact excitation head and the non-contact laser displacement measuring instrument are respectively mounted on the support frame.

[0022] Preferably, in the above-mentioned non-contact blade modal parameter testing device, a third driving motor is installed on the support frame, and a third rotating platform is provided at the output end of the third driving motor; and the non-contact excitation head is installed on the third rotating platform.

[0023] Preferably, the above-mentioned non-contact blade modal parameter testing device further includes a laser scanning head for acquiring the appearance geometric information of the blade, and the laser scanning head is installed on the test bench; the laser scanning head is connected to the main control computer.

[0024] A non-contact blade modal parameter testing method, used in the non-contact blade modal parameter testing device described in any one of the above technical solutions, comprising:

[0025] 1) Clamping the blade to be tested on the mounting bracket;

[0026] 2) applying excitation to the blade using the non-contact excitation head, so that the blade vibrates under the action of the exciting force;

[0027] 3) collecting vibration signals on the blades by means of a non-contact laser displacement measuring instrument and sending the signals to the main control computer;

[0028] 4) The main control computer extracts blade modal parameters according to the vibration signal to obtain test results.

[0029] Preferably, in the above-mentioned non-contact blade modal parameter testing method, after step 1) and before step 2), it also includes:

[0030] 12) Using a laser scanning head of a non-contact blade modal parameter testing device to obtain the appearance geometric information of the blade.

[0031] Preferably, in the above-mentioned non-contact blade modal parameter testing method, the step 4) further includes:

[0032] 5) The main control computer stores the blade modal parameters and the appearance geometric information of the blade for information query and data management.

[0033] The invention provides a non-contact blade modal parameter testing device, comprising a test bench, a non-contact excitation head and a non-contact laser displacement measuring instrument; the test bench is provided with a mounting bracket for loading blades; the non-contact excitation head is installed on the test bench and is used to apply excitation to the blades so that the blades vibrate under the action of the exciting force; the non-contact laser displacement measuring instrument is installed on the test bench and is used to collect vibration signals on the blades and transmit them to a main control computer; the main control computer is used to extract the blade modal parameters according to the vibration signals of the blades; wherein the non-contact excitation head is controlled by the main control computer.

[0034] In the non-contact blade modal parameter testing device provided by the present invention, a non-contact excitation head is used to apply excitation to the blade, so that the blade vibrates under the action of the exciting force, without the need to use a vibration table, which can reduce equipment costs, reduce energy consumption, and thus save testing costs.

[0035] The present invention also provides a non-contact blade modal parameter testing method, which is used for the above-mentioned testing device and does not require the use of a vibration table, thereby reducing the testing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic structural diagram of a non-contact blade modal parameter testing device provided by an embodiment of the present invention;

[0038] in, Figure 1 middle:

[0039] Test bench 1; motor multi-channel controller 2; first drive motor 3; first rotating platform 4; second drive motor 5; second rotating platform 6; blade clamp 7; blade of tested object 8; third drive motor 9; third rotating platform 10; non-contact excitation head 11; laser scanning head 12; non-contact laser displacement measuring instrument 13; main control computer 14; spare crossbeam 15. DETAILED DESCRIPTION

[0040] The embodiment of the present invention discloses a non-contact blade modal parameter testing device, which uses a non-contact excitation head to apply excitation to the blade, so that the blade vibrates under the action of the exciting force, without the need for a vibration table, which can reduce procurement costs and energy consumption. The embodiment of the present invention also discloses a non-contact blade modal parameter testing method, which is used in the above-mentioned testing device, without the need for a vibration table, which can reduce testing costs.

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figure 1An embodiment of the present invention provides a non-contact blade modal parameter testing device, comprising a test bench 1, a non-contact excitation head 11 and a non-contact laser displacement measuring instrument 13; the test bench 1 is provided with a mounting bracket for loading a blade 8 of a test object; the non-contact excitation head 11 is installed on the test bench 1, and is used to apply excitation to the blade 8 of the test object, so that the blade 8 of the test object vibrates under the action of the exciting force; the non-contact laser displacement measuring instrument 13 is installed on the test bench 1, and is used to collect vibration signals on the blade 8 of the test object and transmit them to a main control computer 14; the main control computer 14 is used to extract the modal parameters of the blade 8 of the test object according to the vibration signals of the blade 8 of the test object; wherein the non-contact excitation head 11 is controlled by the main control computer 14.

[0043] In the non-contact blade modal parameter testing device provided in an embodiment of the present invention, a non-contact excitation head 11 is used to apply excitation to the blade 8 of the test object, so that the blade 8 of the test object vibrates under the action of the exciting force. There is no need to use a vibration table, which can reduce equipment costs, reduce energy consumption, and thus save testing costs.

[0044] In order to ensure that the surface of the blade 8 of the tested object faces the non-contact excitation head 11 and the non-contact laser displacement measuring instrument 13, in the non-contact blade modal parameter testing device provided in the above embodiment, the mounting bracket is configured to be able to adjust the posture of the blade 8 of the tested object.

[0045] Specifically, the mounting bracket includes:

[0046] A first drive motor 3, the first drive motor 3 is installed on the test bench 1;

[0047] A first rotating platform 4, which is installed at the output end of the first driving motor 3 and can rotate around the first axis under the driving action of the first driving motor 3;

[0048] The second driving motor 5 is mounted on the first rotating platform 4, and a second rotating platform 6 is mounted on the output end of the second driving motor 5; the second rotating platform 6 can rotate around a second axis under the driving action of the second driving motor 5, and a blade clamp 7 for clamping a blade is provided on the second rotating platform 6. The first axis and the second axis are set to be perpendicular to each other.

[0049] Furthermore, in the non-contact blade modal parameter testing device provided in the above embodiment, the blade chuck 7 comprises:

[0050] A mounting block, the mounting block is fixed on the second rotating platform 6;

[0051] A threaded push rod, wherein the threaded push rod is installed at the threaded hole of the above-mentioned mounting block;

[0052] There are multiple threaded push rods, and each threaded push rod is used to push the mounting tenon of the tested object blade 8 in different directions to clamp the tested object blade 8. The tested object blade 8 includes a blade body and a mounting tenon fixed at the root of the blade body.

[0053] For the convenience of installation, the test bench 1 is provided with a support frame, and the non-contact excitation head 11 and the non-contact laser displacement measuring instrument 13 are respectively installed on the support frame, and the two are respectively installed on different beams of the support frame, and the support frame is also provided with a spare beam 15. A third driving motor 9 is installed on the support frame, and a third rotating platform 10 is provided at the output end of the third driving motor 9; the non-contact excitation head 11 is installed on the third rotating platform 10. When in use, the third driving motor 9 can be controlled to rotate as needed to adjust the angle of the non-contact excitation head 11.

[0054] The non-contact blade modal parameter testing device further includes a laser scanning head (i.e., a non-contact 3D profiler) 12, which is mounted on the test bench 1, specifically on the support frame; the laser scanning head 12 is connected to a main control computer 14. The laser scanning head 12 is used to test the 3D coordinates of the blade appearance to prepare for virtual test analysis.

[0055] The non-contact excitation head 11 is an airflow pulse excitation head or an ultrasonic excitation head, which is not limited in this embodiment. The non-contact laser displacement meter 13 refers to a self-mixing coherent laser displacement measurement system, which is different from other reflective laser vibration measuring instruments. The laser scanning head 12 is a 3D scanner that can accurately measure the appearance contour of the blade 8 of the test object. The main control computer 14 includes a motor multi-channel controller 2, a scanning controller, and a data collector. The motor multi-channel controller 2 controls the mounting bracket and the third drive motor 9. The scanning controller is used to control the laser scanning head 12; the data collector can convert the analog signal output by the non-contact laser displacement meter 13 into a digital signal for software analysis and processing. The blade 8 of the test object to be tested refers to the blade installed on the impeller in the turbine machinery.

[0056] In the non-contact blade modal parameter testing device provided in the present embodiment, the posture of the blade to be tested is automatically adjusted by using the mounting bracket, and the vibration signal of the blade 8 of the tested object is collected by using the non-contact laser displacement measuring instrument 13. There is no need to set a sensor on the blade 8 of the tested object, and there is no need to manually test and adjust the posture of the blade 8 of the tested object, the collection position of the sensor on the blade 8 of the tested object, and whether the sensor collection signal is complete every time a new blade 8 of the tested object is tested. The degree of automation is higher, the process can be simplified, and it is also conducive to improving work efficiency. It can also meet the verification test requirements of large-scale blade manufacturers for the blade 8 of the tested object. In addition, the testing device provided in the present embodiment can also save complete data information, which is convenient for query and data management. Furthermore, the testing device provided in the present embodiment has low cost and high versatility, and adopts non-contact excitation and non-contact measurement methods to reduce the influence of the additional mass and stiffness of the blade 8 of the tested object, which can improve the test accuracy.

[0057] The embodiment of the present invention further provides a non-contact blade modal parameter testing method, which is used in the non-contact blade modal parameter testing device provided in the above embodiment, comprising:

[0058] 1) Clamp the blade 8 to be tested on the mounting bracket;

[0059] 2) applying excitation to the blade 8 of the tested object by using the non-contact excitation head 11, so that the blade 8 of the tested object vibrates under the action of the excitation force;

[0060] 3) collecting vibration signals on the blade 8 of the tested object by means of a non-contact laser displacement measuring instrument 13 and sending the signals to a main control computer;

[0061] 4) The main control computer extracts the modal parameters of the blade 8 of the tested object according to the vibration signal.

[0062] Specifically, in the above test method, after step 1) and before step 2), it also includes: 12) using the laser scanning head 12 of the non-contact blade modal parameter testing device to obtain the appearance geometric information of the blade 8 of the tested object.

[0063] Specifically, step 1) is: using multiple threaded push rods to simultaneously clamp the mounting tenons of the blade 8 of the tested object; after step 1) and before step 2), it also includes: 012) using the mounting bracket to adjust the posture of the blade 8 of the tested object so that the surface of the blade 8 of the tested object faces the non-contact laser displacement measuring instrument 13 and the non-contact excitation head 11. In the implementation scheme with step 12), step 012) is arranged before step 12).

[0064] After step 4), the following further includes: 5) the main control computer stores the blade modal parameters and the appearance geometric information of the blade 8 of the tested object for information query and data management.

[0065] The non-contact blade modal parameter testing method provided in this embodiment is used for the testing device provided in the above embodiment, without using a vibration table, and the testing cost is low. Of course, the testing method provided in this embodiment also has other effects of the related testing device provided in the above embodiment, which will not be repeated here.

[0066] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0067] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A non-contact blade modal parameter testing device, characterized in that: include: A test bench, wherein the test bench is provided with a mounting bracket for loading the blades; A non-contact excitation head, which is mounted on the test bench and is used to apply excitation to the blade so that the blade vibrates under the action of the exciting force; the non-contact excitation head is an airflow pulse excitation head or an ultrasonic excitation head; A non-contact laser displacement measuring instrument, which is installed on the test bench and is used to collect vibration signals on the blade and transmit them to a main control computer; the main control computer is used to extract blade modal parameters according to the vibration signals of the blade; the non-contact laser displacement measuring instrument and the non-contact excitation head are located on the same side of the mounting bracket; Wherein, the non-contact excitation head is controlled by the main control computer; The mounting bracket is capable of adjusting the posture of the blade; The mounting bracket comprises: a first drive motor, wherein the first drive motor is mounted on the test bench; a first rotating platform, which is mounted at an output end of the first driving motor and can rotate around a first axis under the driving action of the first driving motor; a second driving motor, the second driving motor being mounted on the first rotating platform, and a second rotating platform being mounted on an output end of the second driving motor; the second rotating platform being capable of rotating around a second axis under the driving action of the second driving motor, and a blade clamp for clamping a blade being disposed on the second rotating platform; The blade chuck comprises: a mounting block, the mounting block being fixed on the second rotating platform; A threaded push rod, the threaded push rod is installed at the threaded hole of the mounting block; There are multiple threaded push rods, and each threaded push rod is used to tighten the installation tenon of the blade in different directions to achieve clamping of the blade; The test bench is provided with a support frame, and the non-contact excitation head and the non-contact laser displacement measuring instrument are respectively mounted on the support frame; A third driving motor is installed on the support frame, and a third rotating platform is provided at the output end of the third driving motor; the non-contact excitation head is installed on the third rotating platform; It also includes a laser scanning head for acquiring the geometric information of the blade appearance, and the laser scanning head is installed on the test bench; the laser scanning head is connected to the main control computer.

2. A non-contact blade modal parameter testing method, used in the non-contact blade modal parameter testing device according to claim 1, characterized in that: include: 1) Clamping the blade to be tested on the mounting bracket; 2) applying excitation to the blade using the non-contact excitation head, so that the blade vibrates under the action of the exciting force; 3) collecting vibration signals on the blades by means of a non-contact laser displacement measuring instrument and sending the signals to the main control computer; 4) The main control computer extracts blade modal parameters according to the vibration signal to obtain test results.

3. The non-contact blade modal parameter testing method according to claim 2, characterized in that: After step 1) and before step 2), the method further includes: 12) Using a laser scanning head of a non-contact blade modal parameter testing device to obtain the appearance geometric information of the blade.

4. The non-contact blade modal parameter testing method according to claim 3, characterized in that: The step 4) further comprises: 5) The main control computer stores the blade modal parameters and the appearance geometric information of the blade for information query and data management.

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