Vibration excitation device and oil injection vibration excitation system

Abstract

The application discloses a vibration exciting device and an oil injection vibration exciting system. The vibration exciting device comprises a vibration exciting device body, a nozzle and an adjusting assembly. The vibration exciting device body comprises a plurality of adjusting units. All the adjusting units are connected in sequence, and the interval between the adjacent adjusting units is adjustable. One end of the adjusting assembly is connected to the vibration exciting device body, and the other end of the adjusting assembly is connected to the nozzle. The interval between the adjacent adjusting units is adjustable, so that the length of the vibration exciting device is adjustable, and the position of the adjusting assembly and the nozzle connected to the vibration exciting device body is adjustable correspondingly. The performance test of the aero-engine of different sizes can be adapted, the adjustment is convenient, and the test efficiency and economic benefits are improved. The oil injection vibration exciting system is used for a rotor system of an aero-engine. The oil injection vibration exciting system comprises an oil supply and return device and the vibration exciting device. The vibration exciting device is installed on the periphery of the rotor system. The oil supply and return device is communicated with the nozzle.

Description

Technical Field

[0001] This invention relates to a vibration excitation device and an oil-injection vibration system. Background Technology

[0002] During operation, turbine rotor blades in aero-engines operate in an unsteady flow field environment, making them prone to vibration. Excessive vibration loads can lead to fatigue failure of the turbine rotor blades, causing serious damage to the engine. Therefore, it is essential to control the vibration stress of the turbine rotor blades within acceptable limits.

[0003] Currently, both domestic and international researchers are conducting experimental studies and simulation predictions on the vibration characteristics and vibration levels of turbine rotor blades, and designing flange dampers to reduce rotor blade vibration stress and prevent high-cycle fatigue failure. High-pressure turbine rotor blades have very high pass frequencies, and the blades are connected to the rotor via a tenon joint structure. During testing, the resonant frequency of the rotor blades under high-speed rotation and the vibration reduction effect of the damper are measured. This testing method can more closely approximate the boundary conditions in the centrifugal load conditions during engine operation, realizing the nonlinear connection of the rotor blades and the frictional motion between the damper and the rotor blades, thus obtaining more reliable experimental data.

[0004] A commonly used test system takes the rotor system as the research object, uses atomized oil droplets as the excitation source, and performs non-contact excitation on the rotor blades on a high-speed rotating test bench to obtain the blade vibration characteristics of the rotor system and the vibration reduction effect of the damper.

[0005] Under the condition of high-speed turbine rotation, the excitation frequency that excites the engine rotor blades must satisfy the following formula: f=N×n / 60

[0006] In the formula, f is the excitation frequency in Hz; N is the number of fuel injectors; and n is the rotational speed in r / m.

[0007] Because the injector brackets in existing atomized fuel droplet injection systems are not adjustable, tests can only be conducted on engines of the same model. If the engine size changes, the injector bracket needs to be redesigned, resulting in long preparation times. Furthermore, the injector bracket cannot adjust the number, angle, and position of injectors in real time according to different engine speeds, leading to poor test repeatability and low test efficiency. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the defect of the non-adjustable nozzle support in the existing atomized oil droplet injection system, and to provide an excitation device and an injection excitation system.

[0009] The present invention solves the above-mentioned technical problems through the following technical solution:

[0010] A vibration excitation device, comprising:

[0011] The vibration device body includes several adjustment units, all of which are connected in sequence. The spacing between adjacent adjustment units is adjustable, so as to realize the adjustable length of the vibration device body.

[0012] nozzle;

[0013] An adjustment component, one end of which is connected to the body of the excitation device, and the other end of which is connected to the nozzle.

[0014] In this scheme, the length of the excitation device is adjustable by adjusting the spacing between adjacent adjustment units. Correspondingly, the positions of the adjustment components and nozzles connected to the excitation device body are adjustable to adapt to the performance testing of aero engines of different sizes. The adjustment is convenient and improves test efficiency and economic benefits.

[0015] Preferably, there are multiple adjustment components and multiple nozzles, with the multiple adjustment components spaced apart along the length of the excitation device body, and each adjustment component is equipped with at least one nozzle.

[0016] In this solution, the above-mentioned structural form is adopted, which makes it easy to set multiple nozzles at intervals on the body of the excitation device, so that spraying can be performed from multiple positions.

[0017] Preferably, any of the nozzles described can be switched between open and closed states.

[0018] In this solution, the above-described structure allows for adjustment of the number of nozzles that can be opened as needed.

[0019] Preferably, the length of the adjusting component is adjustable.

[0020] In this solution, the above-described structure allows for adjustment of the nozzle position as needed.

[0021] Preferably, the adjustment component is adjustable in angle relative to the body of the excitation device.

[0022] In this solution, the above-mentioned structural form is adopted, and the angle of the nozzle relative to the body of the excitation device can be adjusted as needed.

[0023] Preferably, the adjustment assembly includes a connecting rod and a ball joint structure, and there are multiple connecting rods and ball joint structures. The multiple connecting rods are connected through the ball joint structures. The first end of the connecting rod is connected to the body of the excitation device, and the tail end of the connecting rod is equipped with the ball joint structure. The nozzle is installed on the ball joint structure.

[0024] In this scheme, the above-mentioned structural form allows the nozzle to flexibly adjust the spray angle and range within a wider range, thereby obtaining the optimal spray position and obtaining an angle that is more conducive to exciting blade resonance.

[0025] Preferably, adjacent adjustment units are hinged to each other, and at least one adjustment unit is detachably connected to an adjacent adjustment unit.

[0026] In this design, the aforementioned structural form facilitates adjustment of the spacing between adjacent adjustment units, and also allows for the addition or removal of adjustment units to adjust the length or coverage area of ​​the excitation device body over a wider range. When the nozzle of the excitation device cannot cover the aero-engine valve cover, adjustment units can be added or removed at the disassembly location without disassembling the entire excitation device, making operation convenient.

[0027] Preferably, the adjustment unit is a support rod.

[0028] In this design, the support rod structure is simple, and the support rods are hinged together to form a certain angle. The spacing between adjacent adjustment units can be adjusted by adjusting the relative angle between the support rods.

[0029] Preferably, the adjustment unit includes two support rods, the two support rods being hinged at the middle to form a fork-shaped structure.

[0030] In this solution, by adopting the above-mentioned structural form, the length of the excitation device body can be adjusted by adjusting the included angle of the fork-shaped structure. At the same time, the fork-shaped structure can also form a stable support structure.

[0031] Preferably, all the adjustment units are connected in sequence to form a closed ring structure or a ring structure with an opening.

[0032] In this design, the above-mentioned structural form is adopted, which facilitates the arrangement of more nozzles.

[0033] Preferably, the excitation device further includes a fixed shaft that extends radially along the annular structure, and the adjustment unit is connected to the fixed shaft and is adjustable along the axial direction of the fixed shaft.

[0034] In this design, the fixed shaft is used to support and fix the body of the excitation device.

[0035] Preferably, the adjustment unit includes two support rods, the middle parts of the two support rods are hinged together by a hinge shaft to form a fork-shaped structure, and the fixed shaft and the hinge shaft are the same shaft.

[0036] In this scheme, the above-mentioned structural form is adopted to prevent interference from occurring in the adjustment unit during the adjustment process.

[0037] Preferably, the connection position of the adjustment component to the body of the excitation device is close to the connection position between adjacent adjustment units.

[0038] In this solution, the above-mentioned structural form is adopted to keep the distance between the adjustment components at an optimal position and to avoid interference between the adjustment components during adjustment.

[0039] Preferably, the vibration device further includes a mounting plate and a fixing rod, and the number of fixing rods and the number of fixing shafts are both multiple and are arranged in a one-to-one correspondence. One end of the fixing rod is connected to a surface of the mounting plate, and the other end of the fixing rod is connected to the fixing shaft.

[0040] In this solution, the above-mentioned structural form is adopted, which makes it easy to fix the excitation device body on the mounting plate to form a stable support structure.

[0041] A fuel injection vibration system for use in the rotor system of an aircraft engine, the fuel injection vibration system comprising a fuel supply and return device and a vibration device as described above, the vibration device being mounted on the periphery of the rotor system, the fuel supply and return device being connected to the nozzle.

[0042] In this scheme, the length of the excitation device is adjustable by adjusting the spacing between adjacent adjustment units. Correspondingly, the positions of the adjustment components and nozzles connected to the excitation device body are adjustable to adapt to the performance testing of aero engines of different sizes, and to effectively excite the rotor blades in a rotating state to obtain test data.

[0043] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0044] The positive and progressive effects of this invention are as follows: the length of the excitation device is adjustable by adjusting the spacing between adjacent adjustment units, and the positions of the adjustment components and nozzles connected to the excitation device body are adjusted accordingly to adapt to the performance testing of aero engines of different sizes. The adjustment is convenient and improves the test efficiency and economic benefits. Attached Figure Description

[0045] Figure 1 This is a first-view structural schematic diagram of the excitation device according to a preferred embodiment of the present invention.

[0046] Figure 2 This is a schematic diagram of the excitation device from a second perspective, representing a preferred embodiment of the present invention.

[0047] Figure 3 This is a structural schematic diagram of the excitation device according to a preferred embodiment of the present invention from a third-view perspective.

[0048] Figure 4 This is a partial structural schematic diagram of the excitation device according to a preferred embodiment of the present invention.

[0049] Figure 5 This is a schematic diagram of the structure of the fuel injection vibration system according to a preferred embodiment of the present invention.

[0050] Explanation of reference numerals in the attached figures:

[0051] Vibration device 10

[0052] Vibration device body 1

[0053] Adjustment unit 11

[0054] Nozzle 2

[0055] Adjustment component 3

[0056] Link 31

[0057] 32 ball joint structure

[0058] Fixed shaft 4

[0059] Installation disk 5

[0060] Fixed rod 6

[0061] Rotor system 20

[0062] Oil supply and return device 30

[0063] Pipeline 301

[0064] Motor 40

[0065] Test chamber 50 Detailed Implementation

[0066] The present invention will be described more clearly and completely below by way of embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments described herein.

[0067] like Figures 1-4 As shown, this embodiment discloses a vibration excitation device 10, which includes a vibration excitation device body 1, a nozzle 2, and an adjustment unit 11. The vibration excitation device body 1 includes a plurality of adjustment units 11, all of which are connected in sequence. The spacing between adjacent adjustment units 11 is adjustable to achieve adjustable length of the vibration excitation device body 1. One end of the adjustment component 3 is connected to the vibration excitation device body 1, and the other end of the adjustment component 3 is connected to the nozzle 2.

[0068] In this embodiment, the length of the excitation device 10 is adjustable by adjusting the spacing between adjacent adjustment units 11. Correspondingly, the positions of the adjustment components 3 and nozzles 2 connected to the excitation device body 1 are adjustable to adapt to the performance testing of aero engines of different sizes. The adjustment is convenient and improves the test efficiency and economic benefits.

[0069] In this embodiment, the connection position of the adjustment component 3 and the vibration device body 1 is close to the connection position between adjacent adjustment units 11, so that the spacing between the adjustment components 3 is kept at a better position and interference between multiple adjustment components 3 is avoided during adjustment.

[0070] The device includes multiple adjustment components 3 and multiple nozzles 2. Multiple adjustment components 3 are spaced apart along the length of the excitation device body 1. Each adjustment component 3 is equipped with at least one nozzle 2, which facilitates the arrangement of multiple nozzles 2 at intervals on the excitation device body 1, allowing spraying from multiple positions.

[0071] Furthermore, each nozzle 2 can switch between open and closed states, facilitating adjustment of the number of nozzles 2 open. During testing, the number of nozzles 2 open is adjusted according to the resonant frequency and rotational speed. Specifically, a threaded interface is provided on the nozzle 2, and threaded plugs can be installed on the nozzle 2 to close unnecessary nozzles 2.

[0072] Preferably, the length of the adjusting component 3 is adjustable, so the distance between the nozzle 2 and the vibrating device body 1 can be adjusted, that is, the position of the nozzle 2 is adjustable. Furthermore, the angle of the adjusting component 3 relative to the vibrating device body 1 can be adjusted to achieve adjustable spray angle of the nozzle 2, so as to cover a larger spray range.

[0073] like Figure 1 , Figure 2 and Figure 4 As shown, the adjustment component 3 in this embodiment includes a connecting rod 31 and a ball joint structure 32. There are multiple connecting rods 31 and ball joint structures 32. The multiple connecting rods 31 are connected via the ball joint structures 32. The first end of each connecting rod 31 is connected to the excitation device body 1, and the tail end of each connecting rod 31 is fitted with a ball joint structure 32. A nozzle 2 is mounted on the ball joint structure 32. By adjusting the connecting rods 31 and the ball joint structure 32, the nozzle 2 can flexibly adjust its spray angle and range within a wider range to obtain the optimal spray position, thereby achieving an angle and position more conducive to exciting blade resonance.

[0074] To facilitate adjustment of the spacing between adjacent adjustment units 11, adjacent adjustment units 11 are hinged together. At least one adjustment unit 11 is detachably connected to an adjacent adjustment unit 11, allowing for the addition or removal of adjustment units 11 to adjust the length or coverage area of ​​the excitation device body 1 over a wider range. When the nozzle of the excitation device cannot cover the aircraft engine, adjustment units can be added or removed at the detached position without disassembling the entire excitation device, making operation convenient.

[0075] Specifically, the adjustment unit 11 can be a support rod, with multiple support rods sequentially hinged to form the excitation device body 1. The support rods form a certain angle with each other to allow for adjustable spacing between adjacent support rods. Adjusting the angle between the support rods allows for adjustable length of the excitation device body 1.

[0076] In this embodiment, the adjustment unit 11 includes two support rods, which are hinged at the middle to form a fork-shaped structure. During adjustment, the length of the excitation device body 1 can be adjusted by adjusting the included angle of the fork-shaped structure. At the same time, the fork-shaped structure can also form a stable support structure.

[0077] In this embodiment, to facilitate the arrangement of more nozzles 2 and to form a stable structure, all the adjustment units 11 are connected end to end in sequence to form a closed ring structure. In other alternative embodiments, the adjustment units 11 may also be connected in sequence to form a ring structure with an opening.

[0078] like Figure 1 As shown, the excitation device 10 also includes a fixed shaft 4, which extends radially along the annular structure. An adjustment unit 11 is connected to the fixed shaft 4 and is adjustable along the axial direction of the fixed shaft 4. When fixed, the fixed shaft 4 provides support and fixation to the excitation device body 1; when adjusted, the adjustment unit 11 slides along the fixed shaft 4 and is fixed after adjustment. In this embodiment, the fixed shaft 4 and the hinge shaft are on the same axis to prevent interference during adjustment of the adjustment unit 11.

[0079] The vibration excitation device 10 also includes a mounting plate 5 and fixing rods 6. Multiple fixing rods 6 and fixing shafts 4 are provided, each corresponding to the other. One end of each fixing rod 6 is connected to a surface of the mounting plate 5, and the other end is connected to the fixing shaft 4. By providing the mounting plate 5, the vibration excitation device body 1 can be fixed onto the mounting plate 5, forming a stable support structure.

[0080] A method for adjusting the body of a vibration excitation device includes the following steps:

[0081] 1. Loosen the nuts on each fixed shaft 4 used to fix the adjusting unit 11;

[0082] 2. Adjust the position of the adjustment unit 11 relative to the fixed shaft 4;

[0083] 3. Tighten the nut used to fix the adjustment unit 11.

[0084] In step 2, when the adjusting unit 11 slides outward along the fixed axis, the included angle between the two support rods increases, and the inner diameter of the annular excitation device body 1 increases; when the adjusting unit 11 slides inward along the fixed axis, the included angle between the two support rods decreases, and the inner diameter of the annular excitation device body 1 decreases.

[0085] like Figure 5 As shown, this embodiment also discloses a fuel injection vibration system for testing the vibration and damping effect of the rotor system 20 of an aero-engine under high-speed rotation. The fuel injection vibration system includes a fuel supply and return device 30 and a vibration device 10. The rotor system 20 is installed inside the test chamber 50, and the motor 40 drives the rotor system 20 to rotate. The vibration device 10 is installed on the periphery of the rotor system 20. In this embodiment, there are two vibration devices 10, which are symmetrically arranged on both sides of the rotor system. The fuel supply and return device 30 is connected to the nozzle 2 through an oil pipe 301 and is used to supply fuel to the nozzle 2.

[0086] The vibration excitation device 10 can be adjusted in length by adjusting the spacing between adjacent adjustment units 11. Correspondingly, the positions of the adjustment components 3 and nozzles 2 connected to the vibration excitation device body 1 can be adjusted to adapt to the performance testing of aero engines of different sizes, and to effectively excite the rotor blades in a rotating state to obtain test data.

[0087] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A vibration excitation device, characterized in that, It includes: The vibration device body includes several adjustment units connected sequentially. The spacing between adjacent adjustment units is adjustable to achieve adjustable length of the vibration device body. The adjustment unit is a support rod, and multiple support rods are sequentially hinged to form the body of the excitation device. The support rods form a certain angle with each other, so that the spacing between adjacent support rods can be adjusted; or the adjustment unit includes two support rods, and the middle of the two support rods are hinged to form a fork-shaped structure. By adjusting the angle of the fork-shaped structure, the length of the excitation device body can be adjusted. nozzle; An adjustment component, one end of which is connected to the body of the excitation device, and the other end of which is connected to the nozzle.

2. The excitation device as described in claim 1, characterized in that, The number of adjustment components and nozzles are both multiple, and the multiple adjustment components are arranged at intervals along the length direction of the excitation device body, with at least one nozzle installed on each adjustment component.

3. The excitation device as described in claim 2, characterized in that, Each of the nozzles described can be switched between open and closed states.

4. The excitation device as described in claim 1, characterized in that, The length of the adjustment component is adjustable.

5. The excitation device as described in claim 4, characterized in that, The adjustment component is adjustable in angle relative to the body of the excitation device.

6. The excitation device as described in claim 5, characterized in that, The adjustment assembly includes a connecting rod and a ball joint structure. There are multiple connecting rods and ball joint structures. The multiple connecting rods are connected through the ball joint structure. The first end of the connecting rod is connected to the body of the excitation device, and the tail end of the connecting rod is equipped with the ball joint structure. The nozzle is installed on the ball joint structure.

7. The excitation device as described in claim 1, characterized in that, At least one of the adjustment units is detachably connected to an adjacent adjustment unit.

8. The excitation device as described in claim 1, characterized in that, All the adjustment units are connected in sequence to form a closed ring structure or a ring structure with an opening.

9. The excitation device as described in claim 8, characterized in that, The excitation device further includes a fixed shaft that extends radially along the annular structure. The adjustment unit is connected to the fixed shaft and is adjustable along the axial direction of the fixed shaft.

10. The excitation device as described in claim 9, characterized in that, The adjustment unit includes two support rods, the middle parts of which are hinged together to form a fork-shaped structure, and the fixed shaft and the hinge shaft are the same shaft.

11. The excitation device as described in claim 1, characterized in that, The connection position of the adjustment component to the body of the excitation device is close to the connection position between the adjacent adjustment units.

12. A fuel injection vibration system for use in the rotor system of an aero-engine, characterized in that, The oil injection vibration system includes an oil supply and return device and a vibration device as described in any one of claims 1-11, wherein the vibration device is installed on the periphery of the rotor system and the oil supply and return device is connected to the nozzle.

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