Vibration excitation device and method with adjustable vibration excitation frequency

Abstract

The invention belongs to the field of engine blade testing, and discloses a vibration excitation device and method with adjustable vibration excitation frequency. A motor with adjustable rotating speed is arranged on the mounting plate; a first synchronous pulley is arranged on an output shaft of the motor; a driving crankshaft is arranged on the mounting plate, a connecting plate is arranged on the driving crankshaft, and a connecting part for connecting an engine blade and a tool thereof is arranged on the connecting plate; a transmission belt is arranged on the first synchronous pulley and is connected with a second synchronous pulley arranged on the driving crankshaft; a rotating speed sensor for acquiring the rotating frequency of the driving crankshaft is arranged on the mounting plate. By adjusting the rotating speed of the motor, power transmitted by the transmission belt can be accurately controlled, then the rotating speed of the driving crankshaft is changed, flexible adjustment of the excitation frequency is achieved, diversified experiment and production requirements are met, and different vibration requirements for engine blades and tools of the engine blades in different testing or working environments can be met; and by accurately controlling the excitation frequency, a vibration environment closer to an actual working state can be simulated, so that the accuracy and the reliability of the test are improved.

Description

Technical Field

[0001] The invention belongs to the field of engine blade testing and relates to an excitation device and method with adjustable excitation frequency. Background Art

[0002] The vibration frequency test of engine blades is a crucial step before the assembly of engine blades. This is mainly to ensure that the engine blades can operate stably during operation and avoid damage, reduced efficiency or even failure due to excessive vibration. The working environment of engine blades, especially those in turbines and gas turbines, is extremely harsh and needs to withstand the huge stress caused by high temperature, high pressure and high-speed rotation. Therefore, the vibration characteristics of engine blades are directly related to the performance, reliability and safety of the entire engine.

[0003] At present, when testing the vibration frequency of engine blades, an electromagnetic vibration table is usually used to provide the engine blades with the frequency of excitation vibration. The electromagnetic vibration table then scans the blade vibration frequency through the frequency sweeping technology to obtain the system's response characteristics to different frequencies. The frequency sweeping signal is provided by a signal generator, and the frequency of the signal source is adjusted to achieve continuous frequency changes within a specific frequency range. However, due to the limitations of its working principle and structure, the electromagnetic vibration table is usually subject to internal power supply interference and magnetic field interference, which has a certain impact on the scanning blade's natural frequency, resulting in inaccurate test results. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and to provide an excitation device and method with adjustable excitation frequency.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] According to a first aspect of the present invention, there is provided an excitation device with an adjustable excitation frequency, comprising a mounting plate; a motor with an adjustable speed is arranged on the mounting plate; a first synchronous pulley is arranged on the output shaft of the motor; a driving crankshaft is arranged on the mounting plate, a connecting plate is arranged on the driving crankshaft, a connecting portion for connecting the engine blades and their tooling is arranged on the connecting plate; a transmission belt is arranged on the first synchronous pulley, and the transmission belt is connected to a second synchronous pulley arranged on the driving crankshaft; and a speed sensor for obtaining the rotation frequency of the driving crankshaft is arranged on the mounting plate.

[0007] Optionally, a pulse meter is also included, which is connected to the speed sensor and is used to display the rotation frequency of the active crankshaft obtained by the speed sensor.

[0008] Optionally, a speed controller is also included, which is connected to the motor and is used to adjust the speed of the motor.

[0009] Optionally, a positioning pin is provided on the connecting plate, and the positioning pin is connected to the mounting plate and is used to fix the initial position between the connecting plate and the mounting plate.

[0010] Optionally, a connecting belt is provided on the positioning pin, and the connecting belt is connected to the mounting plate.

[0011] Optionally, a plurality of driven crankshafts are arranged on the mounting plate, and the plurality of driven crankshafts are connected to the connecting plate.

[0012] Optionally, two driven crankshafts are provided, and the two driven crankshafts and the driving crankshaft are distributed in a triangle, and the two driven crankshafts are located on two symmetrical sides of the driving crankshaft.

[0013] Optionally, a mounting seat is provided on the bottom of the mounting plate, and the speed sensor is connected to the mounting plate via the mounting seat; the speed sensor is fixed to the mounting seat via a plurality of mounting nuts.

[0014] Optionally, a fixing block is provided at the bottom of the mounting plate, and a plurality of T-shaped bolts for connecting the operating table and a plurality of bolts for connecting the mounting plate are provided on the fixing block.

[0015] A second aspect of the present invention provides an excitation method with adjustable excitation frequency based on the above-mentioned excitation frequency-adjustable excitation device, comprising: obtaining the excitation frequency requirement and obtaining the rotation frequency requirement of the active crankshaft according to the excitation frequency requirement; obtaining the real-time value of the rotation frequency of the active crankshaft through a speed sensor, and obtaining the speed control requirement of the motor according to the real-time value of the rotation frequency of the active crankshaft and the rotation frequency requirement of the active crankshaft, and controlling the speed of the motor according to the speed control requirement of the motor.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The excitation device with adjustable excitation frequency of the present invention can accurately control the power transmitted by the transmission belt by adjusting the rotation speed of the motor, thereby changing the rotation speed of the active crankshaft, realizing flexible adjustment of the excitation frequency, meeting diversified experimental and production requirements, and being able to adapt to different vibration requirements of engine blades and their tooling under different test or working environments, and by accurately controlling the excitation frequency, being able to simulate a vibration environment closer to the actual working state, thereby improving the accuracy and reliability of the test. The joint design of the active crankshaft and the connecting plate ensures that the engine blades and their tooling can be stably and accurately installed on the excitation device. This stable connection method not only ensures the safety during the test or working process, but also enables the excitation force to be accurately and effectively transmitted to the engine blades, realizing accurate excitation and analysis of the vibration characteristics of the engine blades. The use of a conveyor belt transmission system makes the operation of the device more stable and low in noise, and the synchronous belt is wear-resistant and has a long service life, reducing the maintenance and replacement costs. In addition, the speed sensor can monitor the rotation frequency of the active crankshaft in real time, providing intuitive feedback to the operator, making the adjustment process simpler and faster. The whole device is cleverly designed, and the components are compactly arranged, which effectively saves installation space. This is especially important for occasions where high-precision vibration testing is required in a limited space, such as engine R&D laboratories and aerospace component testing centers. At the same time, the compact structure also facilitates the transportation, installation and maintenance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of an excitation device with adjustable excitation frequency according to an embodiment of the present invention.

[0019] Figure 2 It is a top view of an excitation device with adjustable excitation frequency according to an embodiment of the present invention.

[0020] Figure 3 For the embodiment of the present invention Figure 2 AA section view.

[0021] Figure 4 For the embodiment of the present invention Figure 2 BB cross-sectional view.

[0022] Figure 5 Schematic diagram of the mounting plate structure of an embodiment of the present invention.

[0023] Figure 6 For the embodiment of the present invention Figure 5 AA section view.

[0024] Figure 7 Schematic diagram of the connecting plate structure according to an embodiment of the present invention.

[0025] Figure 8 For the embodiment of the present invention Figure 7AA section view.

[0026] Fig. 9 For the embodiment of the present invention Figure 7 BB cross-sectional view.

[0027] Fig.10 It is a schematic diagram of the main structure of the active crankshaft according to an embodiment of the present invention.

[0028] Fig.11 It is a schematic diagram of the side view structure of the active crankshaft according to an embodiment of the present invention.

[0029] Fig.12 It is a schematic diagram of the front view structure of the driven crankshaft according to an embodiment of the present invention.

[0030] Fig.13 It is a schematic diagram of the side view structure of the driven crankshaft according to an embodiment of the present invention.

[0031] Fig.14 Schematic diagram of the fixed block structure of an embodiment of the present invention.

[0032] Fig.15 Schematic diagram of the positioning pin structure according to an embodiment of the present invention.

[0033] Fig.16 Schematic diagram of the structure of a rotation speed sensor according to an embodiment of the present invention.

[0034] Fig.17 It is a schematic diagram of the side structure of the mounting base according to an embodiment of the present invention.

[0035] Fig.18 It is a schematic diagram of the main structure of the mounting base according to an embodiment of the present invention.

[0036] Among them: 1-mounting plate; 2-motor; 3-locating pin; 4-driving crankshaft; 5-driven crankshaft; 6-connecting plate; 7-fixing block; 8-first synchronous pulley; 81-second synchronous pulley; 9-transmission belt; 10-mounting nut; 11-speed sensor; 12-mounting seat. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0040] See also Figures 1 to 11 In one embodiment of the present invention, there is provided an excitation device with adjustable excitation frequency, including a mounting plate 1; a motor 2 with adjustable speed is arranged on the mounting plate 1; a first synchronous pulley 8 is arranged on the output shaft of the motor 2; an active crankshaft 4 is arranged on the mounting plate 1, a connecting plate 6 is arranged on the active crankshaft 4, and a connecting portion for connecting the engine blades and their tooling is arranged on the connecting plate 6; a transmission belt 9 is arranged on the first synchronous pulley 8, and the transmission belt 9 is connected to a second synchronous pulley 81 arranged on the active crankshaft 4; a speed sensor 11 for obtaining the rotation frequency of the active crankshaft 4 is arranged on the mounting plate 1.

[0041] The engine blades and their tooling are installed using the connecting plate 6, and then the driving crankshaft 4 is connected to the mounting plate 1. The driving crankshaft 4 rotates under the drive of the transmission belt 9 and the first synchronous pulley 8 and the second synchronous pulley 81. The motor 2 is installed on the mounting plate 1, the first synchronous pulley 8 is on the output shaft of the motor 2, and the speed sensor 11 is installed on the mounting plate 1 to measure the rotation frequency of the driving crankshaft 4. The speed of the motor 2 is adjusted by the rotation frequency of the driving crankshaft 4 until the required rotation rate is obtained.

[0042] The transmission belt 9 can be a transmission belt or a transmission synchronous belt. The transmission belt or the transmission synchronous belt can be selected according to actual needs to ensure high operational stability.

[0043] The excitation device with adjustable excitation frequency of the present invention can accurately control the power transmitted by the transmission belt 9 by adjusting the rotation speed of the motor 2, thereby changing the rotation speed of the active crankshaft 4, realizing flexible adjustment of the excitation frequency, meeting diverse experimental and production requirements, and being able to adapt to different vibration requirements of the engine blades and their tooling under different test or working environments, and by accurately controlling the excitation frequency, being able to simulate a vibration environment closer to the actual working state, thereby improving the accuracy and reliability of the test. The joint design of the active crankshaft 4 and the connecting plate 6 ensures that the engine blades and their tooling can be stably and accurately installed on the excitation device. This stable connection method not only ensures the safety during the test or working process, but also enables the excitation force to be accurately and effectively transmitted to the engine blades, realizing accurate excitation and analysis of the vibration characteristics of the engine blades. The use of a conveyor belt transmission system makes the operation of the device more stable and low in noise, and the synchronous belt is wear-resistant and has a long service life, reducing the maintenance and replacement costs. In addition, the speed sensor 11 can monitor the rotation frequency of the active crankshaft 4 in real time, providing intuitive feedback to the operator, making the adjustment process simpler and faster. The whole device is cleverly designed, and the components are compactly arranged, which effectively saves installation space. This is especially important for occasions where high-precision vibration testing is required in a limited space, such as engine R&D laboratories and aerospace component testing centers. At the same time, the compact structure also facilitates the transportation, installation and maintenance of the equipment.

[0044] In a possible implementation, the excitation device with adjustable excitation frequency further includes a pulse meter, which is connected to the rotation speed sensor 11 and is used to display the rotation frequency of the active crankshaft 4 obtained by the rotation speed sensor 11 .

[0045] The pulse meter displays the rotation frequency of the active crankshaft 4 in real time, so that the operator can intuitively understand the current vibration frequency of the excitation device, which is convenient for monitoring and adjustment, and improves the convenience and accuracy of operation.

[0046] In a possible implementation manner, the excitation device with adjustable excitation frequency further includes a speed controller, which is connected to the motor 2 and is used to adjust the speed of the motor 2 .

[0047] By setting a speed controller, the speed of the motor 2 can be accurately adjusted, thereby achieving precise control of the excitation frequency. This automated adjustment method not only improves work efficiency, but also reduces errors caused by manual operation, ensuring the stability and reliability of the excitation frequency.

[0048] In a possible implementation manner, a positioning pin 3 is provided on the connecting plate 6 , and the positioning pin 3 is connected to the mounting plate 1 , so as to fix the initial position between the connecting plate 6 and the mounting plate 1 .

[0049] The positioning pin 3 is used to fix the initial position between the connecting plate 6 and the mounting plate 1, ensuring that the connecting plate 6 can be accurately aligned during the initial installation, reducing the difficulty of installation and adjustment. At the same time, the positioning pin 3 also enhances the connection strength between the connecting plate 6 and the mounting plate 1, improving the stability of the entire excitation device.

[0050] See also Figures 12 to 13 In a possible implementation manner, a plurality of driven crankshafts 5 are arranged on the mounting plate 1 , and the plurality of driven crankshafts 5 are connected to the connecting plate 6 .

[0051] The arrangement of the driven crankshaft 5 can disperse and transmit vibration energy, making the vibration more uniform and stable.

[0052] In a possible implementation manner, two driven crankshafts 5 are provided, and the two driven crankshafts 5 and the driving crankshaft 4 are distributed in a triangle, and the two driven crankshafts 5 are located on two symmetrical sides of the driving crankshaft 4 .

[0053] Multiple driven crankshafts 5 and the driving crankshaft 4 are distributed in a triangle and are located on both sides of the driving crankshaft 4. This layout helps to balance the vibration and reduce the impact of the vibration on the excitation device itself and the surrounding environment. This layout not only achieves uniform transmission and dispersion of vibration, but also enhances the stability of the entire excitation device. The triangular structure formed by the two driven crankshafts 5 and the driving crankshaft 4 has good stability and load-bearing capacity, can cope with large vibration loads, and prolongs the service life of the excitation device.

[0054] In a possible implementation manner, a fixing block 7 is disposed at the bottom of the mounting plate 1 , and a plurality of T-shaped bolts for connecting the operating table and a plurality of bolts for connecting the mounting plate 1 are disposed on the fixing block 7 .

[0055] See also Fig.14 , wherein the fixing block 7 is divided into two fixing components, which are respectively connected to the left and right sides of the bottom of the mounting plate 1. The design of the fixing block 7 and the T-bolt enables the vibration device to be conveniently connected to the operating table, improving the flexibility and adaptability of the installation. At the same time, the use of multiple bolts also enhances the firmness and stability of the connection, ensuring the safety and reliability of the vibration device during operation.

[0056] See also Fig.15 In a possible implementation manner, a connecting belt is provided on the positioning pin 3, and the connecting belt is connected to the mounting plate 1. The positioning pin 3 is accommodated by providing the connecting belt.

[0057] See also Fig.16 In a possible implementation manner, a mounting seat 12 is provided on the bottom of the mounting plate 1 , and the speed sensor 11 is connected to the mounting plate 1 via the mounting seat 12 .

[0058] The mounting base 12 provides a stable mounting base for the rotation speed sensor 11, reducing the risk of sensor loosening and damage caused by vibration. At the same time, this design also facilitates the installation and removal of the rotation speed sensor 11, improving the convenience of maintenance.

[0059] See also Fig.17 and Fig.18 In a possible implementation manner, the rotation speed sensor 11 is fixed on the mounting seat 12 via a plurality of mounting nuts 10 .

[0060] The mounting nut 10 ensures a firm connection between the speed sensor 11 and the mounting base 12, and prevents the speed sensor 11 from loosening or falling off during vibration. The fastening method is simple and reliable, and is easy to operate and maintain.

[0061] The specific use process of the excitation device with adjustable excitation frequency of the present invention is as follows:

[0062] 1. Preparation stage: Place the vibration device on a stable workbench or designated location, and ensure that the bottom of the mounting plate 1 is in good contact with the table surface. Use the T-bolts on the fixing block 7 to firmly connect the vibration device to the operating table. Ensure that all bolts are tightened to prevent the vibration device with adjustable excitation frequency from moving or vibrating during operation.

[0063] 2. Install the engine blades and their tooling: Install the engine blades and their tooling through the connection part on the connecting plate 6. Ensure that the connection is firm and not loose. Use the positioning pin 3 to fix the connecting plate 6 and the mounting plate 1 in the initial position to enhance the stability and accuracy of the connection.

[0064] 3. Check the conveyor belt transmission system: confirm that the first synchronous pulley 8 and the second synchronous pulley 81 are correctly installed on the output shaft of the motor 2 and the active crankshaft 4. Check whether the transmission belt 9 is correctly installed and tensioned to ensure that it can run smoothly during the transmission process without slipping or falling off.

[0065] 4. Connect the speed sensor 11 and the speed controller: Fix the speed sensor 11 on the mounting plate 1 through the mounting seat 12 and the mounting nut 10 to ensure that the speed sensor 11 can accurately measure the rotation frequency of the active crankshaft 4. Connect the pulse meter to the speed sensor 11 to display the rotation frequency in real time. Connect the speed controller to the motor 2 so that the speed of the motor 2 can be accurately adjusted through the speed controller.

[0066] 5. Start and adjust: Start the motor 2, observe the display of the speed sensor 11 and the pulse meter, and confirm that the motor 2 is running normally. According to the experimental or production requirements, adjust the speed of the motor 2 through the speed controller to change the rotation speed and excitation frequency of the active crankshaft 4. During the adjustment process, continue to observe the feedback of the speed sensor 11 to ensure that the required excitation frequency is achieved.

[0067] 6. Conduct vibration test or experiment: After confirming that the excitation frequency has reached the requirement, start the vibration test or experiment. Observe and record the vibration response and characteristics of the engine blades and their tooling under the excitation. If necessary, the excitation frequency can be adjusted to simulate different working environments or test conditions.

[0068] 7. Monitoring and maintenance: During the test or experiment, continuously monitor the operating status of the excitation device to ensure that all components are working properly without abnormal vibration or noise. Regularly check the wear of components such as the conveyor belt drive system, connecting plate 6 and positioning pin 3, and replace severely worn components in time to ensure long-term stable operation.

[0069] Through the above steps, various vibration tests or experiments can be carried out efficiently and accurately using the excitation device with adjustable excitation frequency.

[0070] In another embodiment of the present invention, a vibration excitation method with adjustable excitation frequency is provided. The vibration excitation method with adjustable excitation frequency can be implemented based on the above-mentioned vibration excitation device with adjustable excitation frequency, and can provide different excitation frequencies for the vibration frequency test of the engine blades to achieve a comprehensive vibration frequency test of the engine blades. Specifically, the vibration excitation method with adjustable excitation frequency includes the following steps:

[0071] Obtain the excitation frequency requirement and obtain the rotation frequency requirement of the active crankshaft 4 based on the excitation frequency requirement; obtain the real-time value of the rotation frequency of the active crankshaft 4 through the speed sensor 11, and obtain the speed control requirement of the motor 2 based on the real-time value of the rotation frequency of the active crankshaft 4 and the rotation frequency requirement of the active crankshaft 4, and control the speed of the motor 2 according to the speed control requirement of the motor 2.

[0072] Specifically, by adjusting the speed of the motor 2, the power transmitted by the transmission belt 9 can be accurately controlled, thereby changing the rotation speed of the active crankshaft 4, realizing flexible adjustment of the excitation frequency, meeting diverse experimental and production requirements, and being able to adapt to different vibration requirements for engine blades and their tooling under different tests or working environments, and by accurately controlling the excitation frequency, being able to simulate a vibration environment closer to the actual working state, thereby improving the accuracy and reliability of the test. In addition, the speed sensor 11 can monitor the rotation frequency of the active crankshaft 4 in real time, thereby providing a data basis for the speed control of the motor 2, providing intuitive feedback to the operator, and making the adjustment process simpler and faster.

[0073] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A vibration device with adjustable vibration frequency, characterized in that: comprising a mounting plate (1); A motor (2) with adjustable speed is arranged on the mounting plate (1); A first synchronous pulley (8) is arranged on the output shaft of the motor (2); A driving crankshaft (4) is arranged on the mounting plate (1), a connecting plate (6) is arranged on the driving crankshaft (4), and a connecting portion for connecting an engine blade and a tooling thereof is arranged on the connecting plate (6); A transmission belt (9) is arranged on the first synchronous pulley (8), and the transmission belt (9) is connected to a second synchronous pulley (81) arranged on the driving crankshaft (4); A rotation speed sensor (11) for acquiring the rotation frequency of the active crankshaft (4) is arranged on the mounting plate (1).

2. The excitation device with adjustable excitation frequency according to claim 1, characterized in that: It also includes a pulse meter, which is connected to the rotation speed sensor (11) and is used to display the rotation frequency of the active crankshaft (4) obtained by the rotation speed sensor (11).

3. The excitation device with adjustable excitation frequency according to claim 1, characterized in that: It also includes a speed controller, which is connected to the motor (2) and is used to adjust the speed of the motor (2).

4. The excitation device with adjustable excitation frequency according to claim 1, characterized in that: A positioning pin (3) is provided on the connecting plate (6), and the positioning pin (3) is connected to the mounting plate (1) and is used to fix the initial position between the connecting plate (6) and the mounting plate (1).

5. The excitation device with adjustable excitation frequency according to claim 4, characterized in that: A connecting belt is provided on the positioning pin (3), and the connecting belt is connected to the mounting plate (1).

6. The excitation device with adjustable excitation frequency according to claim 1, characterized in that: A plurality of driven crankshafts (5) are arranged on the mounting plate (1), and the plurality of driven crankshafts (5) are connected to a connecting plate (6).

7. The excitation device with adjustable excitation frequency according to claim 6, characterized in that: Two driven crankshafts (5) are provided, and the two driven crankshafts (5) and the driving crankshaft (4) are distributed in a triangle, and the two driven crankshafts (5) are located on two symmetrical sides of the driving crankshaft (4).

8. The excitation device with adjustable excitation frequency according to claim 1, characterized in that: A mounting seat (12) is provided on the bottom of the mounting plate (1), and the rotation speed sensor (11) is connected to the mounting plate (1) via the mounting seat (12); The rotation speed sensor (11) is fixed on the mounting seat (12) via a plurality of mounting nuts (10).

9. The excitation device with adjustable excitation frequency according to claim 1, characterized in that: A fixing block (7) is arranged at the bottom of the mounting plate (1), and a plurality of T-shaped bolts for connecting the operating table and a plurality of bolts for connecting the mounting plate (1) are arranged on the fixing block (7).

10. An excitation method with adjustable excitation frequency based on the excitation device with adjustable excitation frequency according to claim 1, characterized in that: include: Obtaining an excitation frequency requirement and obtaining a rotation frequency requirement of the active crankshaft (4) according to the excitation frequency requirement; The real-time value of the rotational frequency of the active crankshaft (4) is obtained through a rotational speed sensor (11), and the rotational speed control requirement of the motor (2) is obtained based on the real-time value of the rotational frequency of the active crankshaft (4) and the rotational frequency requirement of the active crankshaft (4), and the rotational speed of the motor (2) is controlled based on the rotational speed control requirement of the motor (2).

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