A turbofan engine eccentric rotation exciter tester

Abstract

The application belongs to the technical field of vibrating machinery, and particularly relates to a turbofan engine eccentric rotation excitation tester. The tester comprises a shell, a rotating shaft and a driving motor. The shell is of a segmented structure, a plurality of shell segments are assembled into an integrated whole through a support disc, an eccentric block is installed on the support disc through a sliding block type bearing seat, and a force sensor is installed on the support disc through a sensor mounting seat; the rotating shaft passes through the center of the support disc and is connected with the sliding block type bearing seat; the driving motor is connected with the support disc through a mounting frame, and the driving motor is provided with a speed increaser, and the speed increaser is connected with the rotating shaft through a belt assembly. The turbofan engine eccentric rotation excitation tester can provide high-speed rotation unbalanced vibration excitation load, can keep consistent with engine mass, center of mass and inertia, can avoid high and low pressure rotor frequency resonance zones of certain engine, and can more truly reproduce engine vibration working conditions.

Description

An eccentric rotating excitation tester for a turbofan engine Technical Field

[0001] This application belongs to the field of vibration machinery technology, and specifically relates to an eccentric rotation excitation tester for a turbofan engine. Background Technology

[0002] As the power plant for flight, the aero-engine is one of the most significant sources of noise and vibration, with rotor unbalance vibration being the primary cause. Currently, engine vibration-related tests generally employ vibration load loading methods based on exciters / vibration tables. However, the additional stiffness introduced by components such as exciter rods alters the boundaries of the research object, further affecting load transmission characteristics. Therefore, there is an urgent need to design an engine simulator capable of simulating the fundamental characteristics of engine rotational unbalance vibration, providing vibration load input for engine vibration transmission tests.

[0003] Therefore, it is desirable to have a technical solution to overcome or at least mitigate one of the aforementioned defects of the prior art. Summary of the Invention

[0004] The purpose of this application is to provide an eccentric rotational excitation tester for turbofan engines to solve at least one problem existing in the prior art.

[0005] The technical solution of this application is:

[0006] An eccentric rotational excitation test apparatus for a turbofan engine, comprising:

[0007] The housing has a segmented structure, with multiple housing segments assembled into one unit by a support plate. An eccentric block is mounted on the support plate via a slider-type bearing seat, and a force sensor is mounted on the support plate via a sensor mounting seat.

[0008] A rotating shaft passes through the center of the support disk and is connected to the slider-type bearing seat;

[0009] A drive motor is provided, which is connected to the support plate via a mounting bracket, and the drive motor is equipped with a speed increaser, which is connected to the rotating shaft via a belt assembly.

[0010] In at least one embodiment of this application, the support plate is connected to the housing segment by bolts, and the support plate has an elongated hole at its center.

[0011] In at least one embodiment of this application, the slider-type bearing housing includes a bearing housing end cover, a bearing housing slider, and a ball bearing, wherein,

[0012] The bearing seat slider is embedded in the elongated hole of the support plate, and the bearing seat slider is provided with a sensor mounting hole;

[0013] The bearing seat end cap is disposed on one side of the bearing seat slider, and both the bearing seat end cap and the bearing seat slider have a central hole for the shaft to pass through.

[0014] The ball bearing is disposed in the center hole of the bearing housing slider and is interference-fitted with the bearing housing slider.

[0015] In at least one embodiment of this application, the eccentric block and the bearing seat end cover are respectively located on both sides of the support plate, and the eccentric block and the bearing seat end cover are fixedly connected by bolts to realize the positioning and installation of the slider bearing seat and the eccentric block.

[0016] In at least one embodiment of this application, one end of the sensor mounting base is provided with a double-ear structure, the two ears of the double-ear structure are respectively located on both sides of the support plate and are fixedly connected to the support plate by bolts, one end of the force sensor is screwed to the end of the sensor mounting base away from the double-ear structure, and the other end of the force sensor is screwed to the bearing seat slider.

[0017] In at least one embodiment of this application, the belt assembly includes a large pulley, a high-speed belt, and a small pulley, wherein,

[0018] One end of the speed increaser is connected to the large pulley, the large pulley is connected to the small pulley via the high-speed belt, and the small pulley is connected to the rotating shaft.

[0019] In at least one embodiment of this application, the housing includes four housing segments, and adjacent housing segments are connected by a first support plate, a second support plate, and a third support plate, respectively.

[0020] In at least one embodiment of this application, the eccentric block includes a first eccentric block, a second eccentric block, and a third eccentric block. The first eccentric block is mounted on the first support plate via a first slider-type bearing seat, the second eccentric block is mounted on the second support plate via a second slider-type bearing seat, and the third eccentric block is mounted on the third support plate via a third slider-type bearing seat.

[0021] The eccentricity of the first eccentric block, the second eccentric block, and the third eccentric block can be adjusted within a range of 0 to 20 mm.

[0022] In at least one embodiment of this application, the first slider bearing seat, the second slider bearing seat, and the third slider bearing seat are all provided with oil filling holes for adding lubricating oil before the test begins.

[0023] In at least one embodiment of this application, the force sensor includes a first force sensor, a second force sensor, and a third force sensor. The first force sensor is mounted on the first support plate via a first sensor mounting base, the second force sensor is mounted on the second support plate via a second sensor mounting base, and the third force sensor is mounted on the third support plate via a third sensor mounting base.

[0024] The invention has at least the following beneficial technical effects:

[0025] The turbofan engine eccentric rotation excitation tester of this application can provide high-speed rotational unbalanced vibration excitation load while maintaining consistency with the engine's mass, center of mass, and inertia, and avoids the high and low pressure rotor frequency resonance zone of a certain type of engine, thus more realistically reproducing the engine vibration condition. Attached Figure Description

[0026] Figure 1 is an overall schematic diagram of a turbofan engine eccentric rotation excitation tester according to one embodiment of this application.

[0027] Figure 2 is a first angle view of the test apparatus after removing the shell according to one embodiment of this application;

[0028] Figure 3 is a second-angle view of the test apparatus after removing the shell according to one embodiment of this application;

[0029] Figure 4 is a schematic diagram of a support plate according to one embodiment of this application;

[0030] Figure 5 is a schematic diagram of a slider-type bearing housing according to one embodiment of this application;

[0031] Figure 6 is a schematic diagram of an eccentric block according to one embodiment of this application;

[0032] Figure 7 is a schematic diagram of an eccentric block according to another embodiment of this application;

[0033] Figure 8 is a schematic diagram of a sensor mounting base according to one embodiment of this application;

[0034] Figure 9 is a schematic diagram of a belt assembly according to one embodiment of this application;

[0035] Figure 10 is a schematic diagram of a mounting bracket according to one embodiment of this application;

[0036] Figure 11 is a schematic diagram of the engine thrust loading point according to one embodiment of this application.

[0037] in:

[0038] 1-Housing; 2-Drive motor; 3-Speed ​​increaser; 4-Belt assembly; 5-Shaft; 6-First eccentric block; 7-Second eccentric block; 8-Third eccentric block; 9-First mounting bracket; 10-First support plate; 11-Second support plate; 12-Third support plate; 13-First slider bearing seat; 14-Second slider bearing seat; 15-Third slider bearing seat; 16-First sensor mounting seat; 17-Second sensor mounting seat; 18-Third sensor mounting seat; 19-First force sensor; 20-Second force sensor; 21-Third force sensor; 22-Large pulley; 23-High-speed belt; 24-Small pulley; 25-Second mounting bracket; 26-Bearing seat end cover; 27-Bearing seat slider; 28-Ball bearing; 29-Sensor mounting hole; 30-Engine thrust loading point. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0040] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, 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 limiting the scope of protection of this application.

[0041] The present application will now be described in further detail with reference to Figures 1 to 11.

[0042] This application provides an eccentric rotational excitation tester for a turbofan engine, comprising: a housing 1, a rotating shaft 5, and a drive motor 2.

[0043] Specifically, as shown in Figures 1-3, the shell 1 has a segmented structure. Adjacent shell segments are connected by support plates, and multiple shell segments are assembled into one unit via support plates. Eccentric blocks are mounted on the support plates via slider-type bearing seats, and force sensors are mounted on the support plates via sensor mounting seats. The force sensors are used to realize real-time measurement and analysis of the eccentric force of each eccentric block. The rotating shaft 5 passes through the center of the support plate and is connected to the slider-type bearing seat. The drive motor 2 is connected to the support plate via a mounting bracket, and the drive motor 2 is equipped with a speed increaser 3. The speed increaser 3 is connected to the rotating shaft 5 via a belt assembly 4. In this test apparatus, the drive motor 2 and the speed increaser 3 are flexibly connected to the rotating shaft 5 via the belt assembly 4. While increasing the rotational speed, the flexible connection of the belt drive can greatly reduce the damage to the drive motor 2 and the speed increaser 3 caused by the vibration of the rotating shaft 5 during eccentric operation, allowing for long-term vibration testing.

[0044] In a preferred embodiment of this application, as shown in FIG4, mounting holes are evenly provided circumferentially along the outer edge of the support disk for bolt connection with each housing segment. An elongated hole is provided at the center of the support disk, and mounting holes for mounting the slider-type bearing seat and sensor mounting base are provided around this elongated hole. The rotating shaft 5 can pass through the elongated hole at the center of the support disk to assemble with the slider-type bearing seat.

[0045] In a preferred embodiment of this application, as shown in FIG5, the slider-type bearing housing includes a bearing housing end cover 26, a bearing housing slider 27, and a ball bearing 28. The bearing housing slider 27 is embedded in an elongated hole in the support plate, and a sensor mounting hole 29 for assembling a force sensor is provided on the bearing housing slider 27. The bearing housing end cover 26 is located on one side of the bearing housing slider 27, and both the bearing housing end cover 26 and the bearing housing slider 27 have a central hole for the rotating shaft 5 to pass through. The ball bearing 28 is located in the central hole of the bearing housing slider 27 and is interference-fitted with the bearing housing slider 27. The ball bearing 28 can be a standard shelf product from the market. The eccentric block and the bearing housing end cover 26 are located on opposite sides of the support plate, and are fixedly connected by bolts, thereby locking the slider-type bearing housing and the eccentric block onto the support plate, achieving the positioning and installation of the slider-type bearing housing and the eccentric block, and preventing slippage during high-speed rotation.

[0046] In a preferred embodiment of this application, as shown in Figures 6-7, two types of eccentric block structures are provided: a circular eccentric block and an elliptical eccentric block. The circular eccentric block is suitable for generating eccentric excitation loads at high-speed rotation (15000 R / min), with an adjustable eccentricity range of 0–20 mm. The elliptical eccentric block is suitable for generating eccentric excitation loads at medium-to-high speeds (3500 R / min), with an adjustable eccentricity range of 0–20 mm.

[0047] In a preferred embodiment of this application, as shown in FIG8, one end of the sensor mounting base is provided with a double-ear structure. The two ears of the double-ear structure are respectively located on both sides of the support plate and are fixedly connected to the support plate by bolts. One end of the force sensor is screwed to the end of the sensor mounting base away from the double-ear structure, and the other end of the force sensor is screwed to the bearing seat slider 27.

[0048] In a preferred embodiment of this application, as shown in FIG9, the belt assembly 4 includes a large pulley 22, a high-speed belt 23, and a small pulley 24. One end of the speed increaser 3 is connected to the large pulley 22, the large pulley 22 is connected to the small pulley 24 via the high-speed belt 23, and the small pulley 24 is connected to the rotating shaft 5. In this embodiment, the outer diameter of the large pulley 22 is 90mm, with a protrusion on one side inserted into the speed increaser 3 for connection. The outer diameter of the small pulley 24 is 30mm, with its center inserted into the rotating shaft 5 for connection. The large pulley 22 and the small pulley 24 are connected via the high-speed belt 23, and the speed ratio between the large pulley 22 and the small pulley 24 is 1:3. Through the two-stage speed increase via the speed increaser 3 and the belt assembly 4, the speed ratio between the drive motor 2 and the rotating shaft 5 reaches 1:9, and the maximum speed of the rotating shaft 5 and its eccentric blocks can reach 20000 R / min.

[0049] The turbofan engine eccentric rotation excitation tester of this application has a drive motor 2 connected to a support plate via a mounting bracket, as shown in Figure 10. The first mounting bracket 9 and the second mounting bracket 25 fix the drive motor 2 and the speed increaser 3 to the support plate. The drive motor 2 and the speed increaser 3 can be selected from standard shelf products on the market.

[0050] In a preferred embodiment of this application, a specific test apparatus structure is provided, wherein the housing 1 comprises four housing segments, adjacent housing segments being connected by a first support plate 10, a second support plate 11, and a third support plate 12, respectively. The test apparatus has eccentric blocks at three different locations, including a first eccentric block 6, a second eccentric block 7, and a third eccentric block 8. The first eccentric block 6 is circular, while the second eccentric block 7 and the third eccentric block 8 are elliptical. The first eccentric block 6 is mounted on the first support plate 10 via a first sliding bearing seat 13, the second eccentric block 7 is mounted on the second support plate 11 via a second sliding bearing seat 14, and the third eccentric block 8 is mounted on the third support plate 12 via a third sliding bearing seat 15. The first eccentric block 6 can simulate vibration excitation at the high-pressure rotor of an engine, the second eccentric block 7 can simulate vibration excitation at the engine's center of mass, and the third eccentric block 8 can simulate vibration excitation at the low-pressure rotor of an engine, achieving simulation of single-point or multi-point synchronous excitation of the engine. Moreover, the eccentricity of each eccentric block can be finely adjusted (0-20mm), and the vibration excitation level at different positions can be adjusted according to the requirements at the same rotation speed.

[0051] Furthermore, the first slider bearing housing 13, the second slider bearing housing 14, and the third slider bearing housing 15 are all provided with oiling holes for adding lubricating oil before the test begins, in order to reduce the friction surface of the ball bearing inside the slider bearing housing, so as to withstand long-term vibration and improve service life. The force sensors include a first force sensor 19, a second force sensor 20, and a third force sensor 21. The first force sensor 19 is mounted on the first support plate 10 via a first sensor mounting base 16, the second force sensor 20 is mounted on the second support plate 11 via a second sensor mounting base 17, and the third force sensor 21 is mounted on the third support plate 12 via a third sensor mounting base 18.

[0052] The turbofan engine eccentric rotation excitation tester of this application is assembled by first screwing the various sections of the housing 1 together using three support plates. Next, three eccentric blocks and their corresponding sliding bearing seats are sequentially installed on the rotating shaft 5. Then, the rotating shaft 5 and other components are passed through the support plates, and the sliding bearing seats, eccentric blocks, and sensor mounting seats are locked to the support plates. Next, the drive motor 2 and the speed increaser 3 are screwed onto the first support plate 10 using the first mounting bracket 9 and the second mounting bracket 25. The other end of the speed increaser 3 is connected to the large pulley 22, which is connected to the small pulley 24 via a high-speed belt 23. The small pulley 24 is fixedly connected to the rotating shaft 5, thereby driving the rotating shaft 5 to rotate. Finally, three force sensors are fixed to the respective support plates using their corresponding sensor mounting seats. A fan is installed inside the housing 1 of the tester. An engine thrust loading point 30 is set on the central cylinder of the fan, capable of withstanding a maximum engine thrust of 23 kN, enabling combined loading of static and dynamic engine loads.

[0053] The eccentric rotational excitation tester for turbofan engines disclosed in this application, through tight assembly, can provide high-speed rotating unbalanced vibration excitation load while maintaining the center of mass, mass, and triaxial moment of inertia parameters basically consistent with those of a certain type of engine, further simulating engine vibration characteristics. Moreover, its critical speed avoids the frequency resonance zone of the high and low pressure rotors of a certain type of engine, and can more realistically reproduce the engine vibration conditions. It is suitable for eccentric rotational excitation within the speed range of 0 to 20000 R / min, and can achieve stepless adjustment of vibration excitation force within the range of 0 to 5000 N at speeds of 3500 R / min (low pressure rotor speed of a certain type of engine) and 15000 R / min (high pressure rotor speed of a certain type of engine), which can meet the speed and excitation force requirements in the relevant tests of a certain domestic engine development.

[0054] The eccentric rotational excitation test apparatus for turbofan engines disclosed in this application can simulate the basic characteristics of rotational unbalanced vibration of turbofan engines, providing vibration load input for vibration transmission testing of aero-engines. Unlike traditional exciter / vibration table excitation methods, it eliminates the boundary changes caused by these methods. This application features a relatively simple structure and is easy to install, providing a reference for high-speed rotational testing needs in other industries.

[0055] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A turbofan engine eccentric rotational excitation test apparatus, characterized in that, include: A housing (1) is a segmented structure, with multiple housing segments assembled together by a support plate. An eccentric block is mounted on the support plate via a slider-type bearing seat, and a force sensor is mounted on the support plate via a sensor mounting seat. A rotating shaft (5) passes through the center of the support plate and is connected to the slider-type bearing seat. A drive motor (2) is connected to the support plate via a mounting bracket, and the drive motor (2) is equipped with a speed increaser (3), which is connected to the rotating shaft (5) via a belt assembly (4). The slider-type bearing seat includes... The bearing housing end cap (26), bearing housing slider (27), and ball bearing (28) are provided. The bearing housing slider (27) is embedded in the elongated hole of the support plate, and a sensor mounting hole (29) is provided on the bearing housing slider (27). The bearing housing end cap (26) is located on one side of the bearing housing slider (27), and a central hole for the rotating shaft (5) to pass through is provided in the center of both the bearing housing end cap (26) and the bearing housing slider (27). The ball bearing (28) is located in the central hole of the bearing housing slider (27) and is interference-fitted with the bearing housing slider (27).

2. The turbofan engine eccentric rotation excitation test apparatus according to claim 1, characterized in that, The support plate is connected to the housing section by bolts, and the support plate has an elongated hole in the center.

3. The turbofan engine eccentric rotation excitation test apparatus according to claim 2, characterized in that, The eccentric block and the bearing seat end cover (26) are located on both sides of the support plate, and the eccentric block and the bearing seat end cover (26) are fixedly connected by bolts to realize the positioning and installation of the slider bearing seat and the eccentric block.

4. The turbofan engine eccentric rotation excitation test apparatus according to claim 3, characterized in that, One end of the sensor mounting base is provided with a double-ear structure. The two ears of the double-ear structure are located on both sides of the support plate and are fixedly connected to the support plate by bolts. One end of the force sensor is screwed to the end of the sensor mounting base away from the double-ear structure, and the other end of the force sensor is screwed to the bearing seat slider (27).

5. The turbofan engine eccentric rotation excitation test apparatus according to claim 1, characterized in that, The belt assembly (4) includes a large pulley (22), a high-speed belt (23) and a small pulley (24). One end of the speed increaser (3) is connected to the large pulley (22), the large pulley (22) is connected to the small pulley (24) through the high-speed belt (23), and the small pulley (24) is connected to the rotating shaft (5).

6. The turbofan engine eccentric rotation excitation test apparatus according to claim 1, characterized in that, The housing (1) includes four housing segments, and adjacent housing segments are connected by a first support plate (10), a second support plate (11) and a third support plate (12), respectively.

7. The turbofan engine eccentric rotation excitation test apparatus according to claim 6, characterized in that, The eccentric block includes a first eccentric block (6), a second eccentric block (7), and a third eccentric block (8). The first eccentric block (6) is mounted on the first support plate (10) via a first slider bearing seat (13). The second eccentric block (7) is mounted on the second support plate (11) via a second slider bearing seat (14). The third eccentric block (8) is mounted on the third support plate (12) via a third slider bearing seat (15). The eccentricity of the first eccentric block (6), the second eccentric block (7), and the third eccentric block (8) can be adjusted within a range of 0 to 20 mm.

8. The turbofan engine eccentric rotation excitation test apparatus according to claim 7, characterized in that, The first slider bearing seat (13), the second slider bearing seat (14) and the third slider bearing seat (15) are all provided with oil filling holes for adding lubricating oil before the test begins.

9. The turbofan engine eccentric rotation excitation test apparatus according to claim 8, characterized in that, The force sensor includes a first force sensor (19), a second force sensor (20), and a third force sensor (21). The first force sensor (19) is mounted on the first support plate (10) via a first sensor mounting base (16). The second force sensor (20) is mounted on the second support plate (11) via a second sensor mounting base (17). The third force sensor (21) is mounted on the third support plate (12) via a third sensor mounting base (18).

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