CN113237664A - Gas excitation load applying device - Google Patents
Gas excitation load applying device Download PDFInfo
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- CN113237664A CN113237664A CN202110500734.6A CN202110500734A CN113237664A CN 113237664 A CN113237664 A CN 113237664A CN 202110500734 A CN202110500734 A CN 202110500734A CN 113237664 A CN113237664 A CN 113237664A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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Abstract
The invention relates to the field of vibration excitation of mechanical parts, in particular to a gas excitation load applying device which can convert high-pressure gas generated by an external gas source into multi-branch high-pressure jet gas flow rotating around a rotating axis. The device has the advantages of simple structure, easy control, capability of generating traveling wave excitation load and the like.
Description
Technical Field
The invention relates to the field of vibration excitation of mechanical parts. In particular to a gas excitation load applying device, which is a gas excitation load applying device of an aeroengine blade disc structure.
Background
In the operation process of the aero-engine, the moving blades of the rotating blade disc and the static blades in the front of the rotating blade disc interact in a flow field to form a fluid interference effect between rotors and stators, so the vibration problem of the aero-engine blade disc is essentially the vibration problem under the excitation of non-uniform aerodynamic loads, and the aerodynamic excitation load borne by the blades in the blade disc structure in the rotating state has the characteristic of traveling wave excitation, namely the excitation load borne by each blade has a fixed phase angle in the phase direction. In the aspect of the resonance test research of the blade disc structure, because the test cost of the real online operation test of the aero-engine is higher, the vibration characteristic research of the blade disc structure is mostly carried out in an offline mode at present. The existing off-line test method is mainly used for applying corresponding excitation load on a blade disc in a non-rotating state according to the characteristics of the excitation load borne by the blade disc in a running stage. In order to better simulate the load excitation borne by the engine blade disc, the controllable and low-cost excitation load applying device is designed, and the device has important significance for the experimental study of the vibration excitation and the resonance characteristic of the off-line engine blade disc.
In the aspect of applying vibration excitation load to a blade disc structure, because the load borne by the blade disc has the characteristic of traveling wave excitation, the existing feasible excitation modes of the non-rotating blade disc mainly comprise the following steps: piezoelectric ceramic excitation, acoustic excitation, and the like. The French scholar Claude Gibert in the document "On forced response of a rotating integrating disk: the use of piezoelectric ceramics to build excitation systems for blisk structures is reported in the expressions and experiments. The American scholars John A Judge reported in the literature "Traveling-wave excitation and optical measurement techniques for non-contacting excitation of a coated disk structure" a method of exciting a disk structure with acoustic excitation. For piezoelectric ceramic excitation, PZT piezoelectric ceramics are generally adhered to the surface of each blade in the circumferential direction of an engine blade disc structural member, and the traveling wave excitation load form is simulated by controlling the excitation frequency and the phase of the piezoelectric ceramics. For acoustic excitation, which is a non-contact excitation mode compared with piezoelectric excitation, an acoustic excitation device is also arranged in the blade tip area, and a corresponding controller is arranged, so that the simulation of the traveling wave excitation load is realized. For the piezoelectric ceramic excitation and the acoustic excitation modes, excitation signals with different phases need to be applied to each blade on the blade disc, and particularly when the number of the blades is large, a controller of the piezoelectric ceramic excitation and acoustic excitation mode needs more signal channels, so the cost is high.
As for the gas excitation method of the vane disk structure, a gas excitation method of the vane disk structure in a rotating state by providing a fixed form of gas injection port on the opposite side of the vane disk structure in a rotating state is reported in an invention patent "rotor blade multi-modal vibration excitation device and excitation method thereof" of the seian university of transportation "(201910342458.8). However, this patent only discloses an air flow excitation device with a fixed mounting position for a rotating blade disc, and this method cannot perform resonance excitation for a stationary blade disc. In the field of equipment cleaning, there are many patents, such as "rotating nozzle system" (201210233158.4), which propose a rotating nozzle device driven by a turbine impeller; the 'nozzle electric rotating device' (02257788.2) proposes a nozzle rotating device for air humidification and atomization, but the rotating nozzle structure involved in the field is generally driven by high-pressure fluid, so that the rotating speed cannot be accurately regulated. However, since the motor-driven rotary head structure is not designed for vibration excitation, it is not suitable or practical to apply the motor-driven rotary head structure to excitation of the disk structure.
Disclosure of Invention
In order to solve the problems, the invention provides a traveling wave pneumatic load applying device for a static state blade disc structure, which converts gas with constant pressure generated by an external gas source into multi-branch high-pressure jet flow rotating around a rotating axis.
In order to achieve the purpose, the invention adopts the following technical scheme:
a gas excitation load applying device mainly comprises a supporting assembly 1, a driving and controlling assembly 2 and a gas spraying assembly 3.
The supporting assembly 1 mainly comprises a static cavity 4, a bolt 5, a motor bracket 6 and a sealing washer a 7; the motor bracket 6 is used for fixing the stepping motor 13 in the driving and controlling assembly 2 and is used as a fixing base of the whole device, and a through hole is formed in the motor bracket 6; one end of the static cavity 4 is fixed on one side of the motor support 6 through a bolt 5, the static cavity 4 is over against a through hole on the motor support 6 and is used for enclosing a static part of a high-pressure gas chamber, an air inlet 21 is arranged on the circumferential surface of the static cavity 4, and constant-pressure airflow generated by an external air source is introduced into the cavity through the air inlet 21; a sealing gasket a7 is arranged between the static cavity 4 and the motor bracket 6 for closing the chamber.
The driving and control assembly 2 mainly comprises a stepping motor driving plate 8, a stepping motor speed regulating plate 9, a driving shaft 10, a coupler 11, a sealing washer b12 and a stepping motor 13; the stepping motor 13 is arranged on the other side of the motor support 6, an output shaft of the stepping motor 13 penetrates through a through hole in the motor support 6, the stepping motor 13 provides rotary power for the whole device, and a sealing gasket b12 is arranged between the stepping motor 13 and the motor support 6 and used for sealing a cavity; the stepping motor 13 is connected with the shaft end of the driving shaft 10 through the coupler 11, the flange side of the driving shaft 10 is connected with the rotating cavity 15 in the air injection assembly 3 through bolts, the driving shaft 10 transmits the torque from the stepping motor 13 to the rotating cavity 15, and the coupler 11 and the driving shaft 10 are positioned in the cavity; the stepping motor driving plate 8 is connected with the stepping motor 13 through a lead and is used for driving the stepping motor 13 to run; the stepping motor speed regulation plate 9 is connected with the stepping motor drive plate 8 through a lead and is used for regulating the speed of the stepping motor 13.
The gas injection assembly 3 mainly comprises a gas injection pipe 14, a rotary cavity 15, an angular contact ball bearing 16, a sealing washer c17, a bearing end cover 18, a sealing ring a19 and a sealing ring b 20; the angular contact ball bearing 16 is installed at the other end of the static cavity 4, the outer side end of the rotating cavity 15 is of a sealing structure, the inner side end of the rotating cavity 15 is sleeved at the end part of the static cavity 4, and the angular contact ball bearing 16 supports the rotating cavity 15 to rotate; the plurality of gas nozzles 14 are uniformly distributed on the circumferential surface of the rotating cavity 15, the gas nozzles 14 are communicated with the inside of the rotating cavity 15, the rotating cavity 15 enables the gas nozzles 14 to rotate around the center to generate traveling wave excitation load meeting the actual rotating blade disc structure, and therefore the gas nozzles 14 guide high-pressure gas to flow from the gas cavity to the gas nozzle outlet to generate high-pressure jet flow; the bearing end cover 18 is mounted at the end part of the inner side end of the rotating cavity 15 through a bolt, a sealing washer c17 is arranged between the bearing end cover 18 and the rotating cavity 15 and used for sealing the cavity and restraining the outer ring of the angular contact ball bearing 16, a sealing washer a19 is arranged among the inner ring of the angular contact ball bearing 16, the bearing end cover 18 and the static cavity 4, and a sealing washer b20 is arranged between the bearing end cover 18 and the static cavity 4 and used for sealing the cavity.
The invention has the beneficial effects that: the controllable gas excitation applying device designed by the invention can convert high-pressure gas generated by an external gas source into multi-branch high-pressure jet gas flow rotating around a rotating axis, can conveniently apply traveling wave gas excitation to the integral blade disc structure of the aircraft engine, and provides powerful support for vibration characteristic test research of the blade disc structure in a static state.
Drawings
FIG. 1 is a schematic view of a gas stimulus application device;
FIG. 2 is a cross-sectional view of a gas stimulus applying means;
FIG. 3 is a partial cross-sectional view of the bearing end cap and static cavity seal area;
FIG. 4 is a schematic view of a support assembly;
FIG. 5 is a schematic view of a drive and control assembly;
FIG. 6 is a schematic view of a rotary jet module.
In the figure: the air inlet structure comprises a support assembly 1, a drive and control assembly 2, an air injection assembly 3, a static cavity 4, a bolt 5, a motor support 6, a sealing washer a7, a stepping motor drive plate 8, a stepping motor speed regulation plate 9, a drive shaft 10, a coupler 11, a sealing washer b12, a stepping motor 13, an air injection pipe 14, a rotating cavity 15, an angular contact ball bearing 16, a sealing washer c17, a bearing end cover 18, a sealing washer a19, a sealing washer b20 and an air inlet hole 21.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
As shown in fig. 1 to 5, the gas-excited load applying apparatus of the present invention mainly comprises a supporting assembly 1, a driving and controlling assembly 2, and a gas spraying assembly 3, and specifically comprises: the device comprises a static cavity 4, a bolt 5, a motor support 6, a sealing washer a7, a stepping motor driving plate 8, a stepping motor speed adjusting plate 9, a driving shaft 10, a coupler 11, a sealing washer b12, a stepping motor 13, an air injection pipe 14, a rotating cavity 15, an angular contact ball bearing 16, a sealing washer c17, a bearing end cover 18, a sealing washer a19, a sealing washer b20 and an air inlet 21. The connection relation and the function of each component are as follows:
the supporting component 1 is used for fixing the stepping motor 13, installing the rotary air injection component 3, simultaneously forming a static part of an air chamber (comprising a static cavity 4 and a rotary cavity 15), namely the static cavity 4, and arranging an air inlet 21 of an external air source on the circumferential surface of the static cavity 4.
The drive and control assembly 2 is used to provide rotational power to the rotary jet assembly 3.
The rotary jet assembly 3 is used to guide the high pressure gas flow, and the high pressure jet gas flow generated at the outlet of the gas jet pipe 14 excites the vibration of the blade disc structure and also serves as a rotating part enclosing the gas chamber.
The static cavity 4 is fixed on the motor bracket 6 through a bolt 5 and is used for enclosing a static part of a high-pressure gas chamber and introducing a constant-pressure gas flow generated by an external gas source into the cavity through an air inlet 21.
The bolts 5 are used to fix the stationary housing 4 to the motor bracket 6.
The motor bracket 6 is used for fixing the stepping motor 13 and serves as a fixing base of the whole device.
The sealing gasket a7 is arranged between the static cavity 4 and the motor bracket 6 and is used for sealing the chamber and preventing high-pressure gas in the chamber from leaking.
The stepping motor driving plate 8 is connected with the stepping motor 13 through a lead and is used for driving the stepping motor 13 to operate.
The stepping motor speed regulation plate 9 is connected with the stepping motor drive plate 8 through a lead and is used for regulating the speed of the stepping motor 13.
The driving shaft 10 is used for transmitting the torque from the stepping motor 13 to the rotating cavity 15, the flange side of the driving shaft 10 is connected with the rotating cavity 15 through bolts, and the shaft end of the driving shaft 10 is connected with the coupling 11.
The coupling 11 is used to connect the driving shaft 10 and the stepping motor 13, and transmits the torque from the stepping motor 13.
The sealing washer b12 is installed between the stepping motor 13 and the motor support 6 to seal the cavity and prevent the high-pressure gas from leaking.
The stepper motor 13 is used to provide rotational power to the entire device.
The gas nozzles 14 are uniformly distributed on the circumferential surface of the rotary cavity 15, and the total number of the gas nozzles is 10, and the gas nozzles are used for guiding high-pressure gas to flow from the gas cavity to the gas nozzle outlet to generate high-pressure jet flow.
The rotating cavity 15 is used for enabling the gas ejector pipe 14 to rotate around the center, and traveling wave excitation load meeting the actual requirements of the rotating blade disc is generated.
The angular contact ball bearing 16 is mounted on the stationary chamber 4 for supporting the rotation of the rotating chamber 15.
The sealing washer c17 is installed between the rotating chamber 15 and the bearing end cover 18 to seal the chamber and prevent the leakage of high pressure gas.
The bearing end cap 18 is connected to the rotating chamber 15 by a bolt and a sealing washer c17 to close the chamber and restrain the outer race of the angular contact ball bearing 16.
The sealing ring a19 is installed between the bearing end cover 18 and the static cavity 4 to seal the cavity and prevent high-pressure gas from leaking.
The sealing ring b20 is also installed between the bearing end cover 18 and the static cavity 4 to seal the cavity and prevent high-pressure gas from leaking.
The air inlet hole 21 is used for connecting high-pressure air generated by an external air pump.
The working process is as follows: during the operation of the gas excitation applying device, high-pressure gas generated by an external gas source enters a gas chamber enclosed by the static cavity 4, the motor bracket 6, the stepping motor 13, the rotating cavity 15, the bearing end cover 18, the sealing washer a7, the sealing washer b12, the sealing washer c17, the sealing washer a19 and the sealing washer b20 through the gas inlet 21 formed in the surface of the static cavity 4. Meanwhile, the stepping motor 13 is driven to rotate by the stepping motor driving plate 8, and the driving shaft 10 is driven by the coupler 11 to drive the rotating cavity 15 to rotate. The rotating speed of the stepping motor 13 can be adjusted by the stepping motor speed adjusting plate 9 during the operation process. Because the 14 gas ejector pipes are uniformly arranged on the circumferential surface of the 15 rotating cavity and communicated with the gas cavity, high-pressure gas in the cavity can form high-pressure jet flow rotating around the axial lead of the driving shaft 10 under the driving of the rotating cavity 15, so that high-pressure gas excitation load meeting the characteristic of traveling wave excitation is generated at the outlet of the gas ejector pipe 14 and is used for performing traveling wave excitation on the blade disc structure.
Claims (1)
1. The gas excitation load applying device is characterized by mainly comprising a supporting assembly (1), a driving and controlling assembly (2) and a gas spraying assembly (3);
the support assembly (1) mainly comprises a static cavity (4), a bolt (5), a motor bracket (6) and a sealing washer a (7); the motor support (6) is used for fixing the stepping motor (13) in the driving and controlling assembly (2) and is used as a fixing base of the whole device, and a through hole is formed in the motor support (6); one end of the static cavity (4) is fixed on one side of the motor support (6) through a bolt (5), the static cavity (4) is opposite to a through hole on the motor support (6) and used for enclosing a static part of a high-pressure gas chamber, an air inlet hole (21) is formed in the circumferential surface of the static cavity (4), and constant-pressure airflow generated by an external air source is introduced into the cavity through the air inlet hole (21); a sealing gasket a (7) is arranged between the static cavity (4) and the motor bracket (6) and used for sealing the cavity;
the driving and controlling assembly (2) mainly comprises a stepping motor driving plate (8), a stepping motor speed regulating plate (9), a driving shaft (10), a coupler (11), a sealing washer b (12) and a stepping motor (13); the stepping motor (13) is arranged on the other side of the motor support (6), an output shaft of the stepping motor (13) penetrates through a through hole in the motor support (6), the stepping motor (13) provides rotating power for the whole device, and a sealing gasket b (12) is arranged between the stepping motor (13) and the motor support (6) and used for sealing a cavity; the stepping motor (13) is connected with the shaft end of the driving shaft (10) through a coupler (11), the flange side of the driving shaft (10) is connected with a rotating cavity (15) in the air injection assembly (3) through a bolt, the driving shaft (10) transmits the torque from the stepping motor (13) to the rotating cavity (15), and the coupler (11) and the driving shaft (10) are positioned in the cavity; the stepping motor driving plate (8) is connected with the stepping motor (13) through a lead and is used for driving the stepping motor (13) to operate; the stepping motor speed regulation plate (9) is connected with the stepping motor driving plate (8) through a lead and is used for regulating the speed of the stepping motor (13);
the air injection assembly (3) mainly comprises an air injection pipe (14), a rotary cavity (15), an angular contact ball bearing (16), a sealing washer c (17), a bearing end cover (18), a sealing washer a (19) and a sealing washer b (20); the angular contact ball bearing (16) is arranged at the other end of the static cavity (4), the outer side end of the rotating cavity (15) is of a sealing structure, the inner side end of the rotating cavity (15) is sleeved at the end part of the static cavity (4), and the angular contact ball bearing (16) supports the rotating cavity (15) to rotate; the gas injection pipes (14) are uniformly distributed on the circumferential surface of the rotary cavity (15), the gas injection pipes (14) are communicated with the inside of the rotary cavity (15), the rotary cavity (15) enables the gas injection pipes (14) to rotate around the center to generate traveling wave excitation load meeting the requirement of the actual rotary blade disc structure, and therefore the gas injection pipes (14) guide high-pressure gas to flow from the gas cavity to the gas injection nozzle outlet to generate high-pressure jet flow; the bearing end cover (18) is mounted at the end part of the inner side end of the rotating cavity (15) through a bolt, a sealing washer c (17) is arranged between the bearing end cover (18) and the rotating cavity (15) and used for sealing the cavity and limiting the outer ring of the angular contact ball bearing (16), a sealing washer a (19) is arranged among the inner ring of the angular contact ball bearing (16), the bearing end cover (18) and the static cavity (4), and a sealing washer b (20) is arranged between the bearing end cover (18) and the static cavity (4) and used for sealing the cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110500734.6A CN113237664A (en) | 2021-05-08 | 2021-05-08 | Gas excitation load applying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110500734.6A CN113237664A (en) | 2021-05-08 | 2021-05-08 | Gas excitation load applying device |
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| CN113237664A true CN113237664A (en) | 2021-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110500734.6A Withdrawn CN113237664A (en) | 2021-05-08 | 2021-05-08 | Gas excitation load applying device |
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| CN (1) | CN113237664A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115081348A (en) * | 2022-05-07 | 2022-09-20 | 重庆大学 | Traveling wave excitation system of periodically symmetrical blade disc structure |
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| CN102861685A (en) * | 2011-07-06 | 2013-01-09 | 莱希勒有限公司 | Rotating nozzle system |
| US20130081476A1 (en) * | 2008-03-12 | 2013-04-04 | Rolls-Royce Plc | Fatigue test arrangement |
| CN105699033A (en) * | 2016-02-18 | 2016-06-22 | 东北大学 | High frequency air excitation test device for fiber-reinforced combined thin wall member |
| CN106370369A (en) * | 2016-08-16 | 2017-02-01 | 中国航空工业集团公司沈阳发动机设计研究所 | High frequency gas excitation tester |
| CN108444665A (en) * | 2018-03-16 | 2018-08-24 | 北京化工大学 | Rotating vane excitation system and apparatus for rotating vane vibration test system |
| CN109141794A (en) * | 2018-10-08 | 2019-01-04 | 北京化工大学 | A kind of rotating vane exciting test device and system |
| CN109612663A (en) * | 2019-01-08 | 2019-04-12 | 大连交通大学 | A kind of rotation high-frequency alternating air-flow excitation experimental rig |
| CN109708835A (en) * | 2019-02-21 | 2019-05-03 | 哈尔滨汽轮机厂有限责任公司 | A kind of steam turbine blade intrinsic frequency measurement excitation system |
| CN110068439A (en) * | 2019-04-25 | 2019-07-30 | 西安交通大学 | Rotor blade multiple modal vibrations exciting bank and its motivational techniques |
-
2021
- 2021-05-08 CN CN202110500734.6A patent/CN113237664A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130081476A1 (en) * | 2008-03-12 | 2013-04-04 | Rolls-Royce Plc | Fatigue test arrangement |
| CN102861685A (en) * | 2011-07-06 | 2013-01-09 | 莱希勒有限公司 | Rotating nozzle system |
| CN105699033A (en) * | 2016-02-18 | 2016-06-22 | 东北大学 | High frequency air excitation test device for fiber-reinforced combined thin wall member |
| CN106370369A (en) * | 2016-08-16 | 2017-02-01 | 中国航空工业集团公司沈阳发动机设计研究所 | High frequency gas excitation tester |
| CN108444665A (en) * | 2018-03-16 | 2018-08-24 | 北京化工大学 | Rotating vane excitation system and apparatus for rotating vane vibration test system |
| CN109141794A (en) * | 2018-10-08 | 2019-01-04 | 北京化工大学 | A kind of rotating vane exciting test device and system |
| CN109612663A (en) * | 2019-01-08 | 2019-04-12 | 大连交通大学 | A kind of rotation high-frequency alternating air-flow excitation experimental rig |
| CN109708835A (en) * | 2019-02-21 | 2019-05-03 | 哈尔滨汽轮机厂有限责任公司 | A kind of steam turbine blade intrinsic frequency measurement excitation system |
| CN110068439A (en) * | 2019-04-25 | 2019-07-30 | 西安交通大学 | Rotor blade multiple modal vibrations exciting bank and its motivational techniques |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115081348A (en) * | 2022-05-07 | 2022-09-20 | 重庆大学 | Traveling wave excitation system of periodically symmetrical blade disc structure |
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Application publication date: 20210810 |