CN112857719B - Fixed airfoil flutter ground test device and method - Google Patents
Fixed airfoil flutter ground test device and method Download PDFInfo
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- CN112857719B CN112857719B CN202011612115.8A CN202011612115A CN112857719B CN 112857719 B CN112857719 B CN 112857719B CN 202011612115 A CN202011612115 A CN 202011612115A CN 112857719 B CN112857719 B CN 112857719B
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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Abstract
The invention belongs to the technical field of pneumatic elasticity. A fixed airfoil flutter ground test device and method are designed, the device comprises: the test system comprises a ground power system, a test mounting platform and an airfoil test bench; the test mounting platform is mounted on a ground power system, the ground power system provides horizontal plane rotary power for the test mounting platform, the airfoil test bench is mounted on the test mounting platform, the distance between the airfoil test bench and the rotating shaft and the angle of the airfoil test bench are adjustable, and the flutter test sample piece 9 is mounted on the airfoil test bench. The invention not only can realize the ground test verification of the flutter characteristics of fixed airfoils such as aircraft wings and the like under the non-wind tunnel test condition, but also can realize the parametric variation test research under different states through the adjustment of the rotation frequency, the installation angle and the rotation radius, and realize the real-time safety protection of the airfoils through the signal correlation between the test system and the ground power system.
Description
Technical Field
The invention belongs to the technical field of pneumatic elasticity.
Background
At present, the laboratory verification technology for the flutter characteristics at home and abroad mainly comprises a model flutter wind tunnel test and a dry wind tunnel flutter ground test, which have limitations, the model flutter wind tunnel test needs to provide a stable wind speed flow field, the cost is high, the wind speed is difficult to be reduced immediately, and the model is easy to destroy; the dry wind tunnel ground test needs to simulate the action of pneumatic force through efficient numerical calculation and loading by using a vibration exciter, and the system is complex and difficult to operate, is still in an exploration and research stage at present, and has low maturity. Therefore, in order to efficiently and accurately check the flutter characteristics of the lifting surface of the aircraft, a fixed airfoil flutter ground test device needs to be designed, test verification of the fixed airfoil flutter characteristics is realized under the non-wind tunnel test condition, and the effect of reducing test cost is achieved.
Disclosure of Invention
Object of the Invention
The invention designs a fixed airfoil flutter ground test device and a fixed airfoil flutter ground test method, which not only can realize ground test verification of fixed airfoil flutter characteristics of an aircraft wing and the like under a non-wind tunnel test condition, but also can realize variable parameter test research under different states, and realize real-time safety protection of the airfoil.
Technical proposal
A stationary airfoil flutter ground test apparatus comprising:
the test system comprises a ground power system, a test mounting platform and an airfoil test bench;
the test mounting platform is mounted on a ground power system, the ground power system provides horizontal plane rotary power for the test mounting platform, the airfoil test bench is mounted on the test mounting platform, the distance between the airfoil test bench and the rotating shaft and the angle of the airfoil test bench are adjustable, and the flutter test sample piece 9 is mounted on the airfoil test bench.
The ground power system comprises a fixed base 1, a rotating motor 2, a rotating shaft 3 and a rotating frequency controller 4;
the rotating motor 2 is located on the fixed base 1, the rotating shaft 3 is connected to the upper portion of the rotating motor 2, the rotating shaft 3 is upwards connected with the test installation platform, the rotating frequency controller 4 is located on the rotating motor 2, the rotating speed of the rotating motor 2 is controlled, and then the rotating speed of the rotating shaft 3 is controlled.
The test mounting platform comprises a rotating platform 5 driven by a rotating shaft 3 and sliding adjusting grooves 6 symmetrically arranged on the rotating platform 5.
The airfoil test bench comprises a sliding base 7 arranged on a rotating platform 5, an angle adjusting groove 8 is formed in the sliding base 7, and a flutter test sample piece 9 is arranged on the sliding base 7.
Further comprises: the test system comprises a sensor 14 arranged on the flutter test sample 9, vibration signals measured by the sensor 14 are transmitted to a signal collector 16 through a first wire 15, and the signal collector 16 transmits the signals to the rotating frequency controller 4 through a second wire 17.
Further comprises: the dynamic balance adjusting system comprises a sliding base 10 arranged on a test mounting platform 5, a stand column 11 is vertically arranged on the sliding base 10, a stop groove 12 is formed in the stand column 11, a counterweight 13 is arranged on the stand column 11, and the position of the counterweight is fixed through a limit bolt in the stop groove 12.
A stationary airfoil flutter ground test method comprising:
step 1, moving a sliding base to be away from the center of a circle of a test mounting platform on a test benchThe position is fixed, a flutter test sample is connected to the sliding base, a sensor and a wire are arranged on the flutter test sample, and after the flutter test sample and the test system are installed, the dynamic balance adjusting system is fixed to a distance away from the center of the circle of the installation platform>The position is provided with a counterweight to be installed and fixed according to the weight characteristic of the airfoil test bench, and after all preparations are completed, the test installation platform is driven to rotate through a ground power system, and the rotation frequency is +.>The stability of the whole system can be observed by rotating at a small frequency just at the beginning and the rotation frequency is increased until the test piece generates unstable divergent oscillation, at the moment +.>Namely, the vibration speed +.>
Further comprises:
step 2, lead toOver rotation frequencyRadius of rotation->The combination adjustment of the device realizes the flutter test under different deformation states; at this time, the deformation of the airfoil and the centrifugal force Mω generated by the rotation of the airfoil 2 R is directly related; further, by rotating the frequencyRadius of rotation->And the airfoil installation angle alpha are combined and adjusted to realize a flutter test in a deformation-free state; at this time, centrifugal force Mω generated by the rotation of the airfoil 2 R and aerodynamic force 1/2 ρV generated by airfoil forward movement 2 C lα The airfoil deformations produced by αs cancel each other out.
Advantageous effects
The flutter ground test device comprises a ground power system, a test mounting platform, an airfoil test bench, a dynamic balance adjusting system and a test system, so that the flutter characteristics of fixed airfoils such as airfoils can be simulated, and the flutter characteristics test verification of the fixed airfoils under different deformation conditions can be realized through the combined action of rotation frequency, rotation radius and mounting angle. Compared with the prior art, the fixed airfoil flutter ground test technology provided by the invention develops a new way, a brand-new flutter test way is created, the designed flutter ground test device has the advantages of simple structure, convenient operation and low running cost, the test efficiency is far higher than that of the current flutter wind tunnel test and dry wind tunnel ground test, the safety of the test technology is far higher than that of the flutter wind tunnel test, the test technology is mainly beneficial to the real-time transmission of airfoil vibration signals to a rotating frequency controller, the airfoil advancing speed can be reduced immediately, and the wind speed in the flutter wind tunnel test is difficult to reduce immediately, so that the model is destroyed. The device is portable and practical, and can be used for teaching and displaying in schools besides scientific researches and model tests.
Drawings
FIG. 1 is a schematic view of a flutter floor test apparatus according to the present invention.
FIG. 2 is a schematic view of an airfoil bench according to the invention.
Detailed Description
The flutter ground test device designed here mainly comprises five parts: the test system comprises a ground power system, a test mounting platform, an airfoil test bed, a dynamic balance adjusting system and a test system, wherein the test mounting platform is shown in figures 1 and 2.
The ground power system comprises a base 1 fixed with the ground, a motor 2 for providing rotation power, a rotating shaft 3 for driving the platform to rotate, and a rotation frequency controller 4 for adjusting the rotation frequency;
the test mounting platform comprises a rotating platform 5 which is connected with the rotating shaft 3, and a sliding adjusting groove 6 which can adjust the mounting position of the test piece is arranged on the rotating platform 5;
the airfoil test bed comprises a sliding base 7 arranged on a test mounting platform 5, an angle adjusting groove 8 capable of adjusting the mounting angle of a test piece is arranged on the sliding base 7, and a flutter test sample piece 9 is vertically arranged on the sliding base 7;
the dynamic balance adjusting system comprises a sliding base 10 arranged on the test mounting platform 5, wherein the sliding base 10 is connected with a stand column 11, a stop groove 12 is formed in the stand column 11, and a balance weight 13 is arranged on the stand column 11 and is adjusted and fixed in position through the stop groove so as to ensure that the weight characteristic of the dynamic balance adjusting device is consistent with that of the airfoil test bench;
the test system comprises a sensor 14 arranged on the flutter test sample 9, vibration signals measured by the sensor are transmitted to a signal collector 16 through a first lead 15, the signal collector 16 can transmit signals to the rotating frequency controller 4 through a second lead 17, and safety protection control is formed by setting a threshold value.
Through ground driving system, test mounting platform, airfoil test bench, dynamic balance governing system and test system, constitute a flutter ground test device that can operate under atmospheric environment, not only can simulate fixed airfoil flutter characteristics such as wing, also can realize fixed airfoil flutter characteristic test under the different deformation circumstances through rotation frequency, turning radius and installation angle's combined action, realize the real-time safety protection of airfoil through the signal correlation between test system and the ground driving system moreover.
The fixed airfoil flutter test embodiments are:
1. fixed airfoil conventional flutter test: on the test bench, the sliding base is moved to a distance from the center of the test installation platformFixing the test piece, connecting the test piece with the sliding base, arranging a sensor and a wire on the test piece, and fixing the dynamic balance adjusting system to be away from the center distance +.>The balance weight is installed and fixed according to the weight characteristic of the airfoil test bench, and after all the balance weights are prepared properly, the test installation platform is driven to rotate through a ground power system, and the rotation frequency is +.>The stability of the whole system can be observed by rotating at a small frequency just at the beginning and regulated by the rotating frequency controller, and the rotating frequency slowly increases until the test piece generates unstable divergent oscillation, at the moment +.>Namely, the vibration speed +.>
2. Fixed airfoil parametric chatter test: by rotating the frequency on the basis of conventional flutter testRadius of rotation/>The combination adjustment of the device realizes the flutter test under different deformation states. At this time, the deformation of the airfoil and the centrifugal force Mω generated by the rotation of the airfoil 2 R is directly related. Further, by the rotation frequency->Radius of rotation->And the airfoil installation angle alpha can realize flutter test in a deformation-free state. At this time, centrifugal force Mω generated by the rotation of the airfoil 2 R and aerodynamic force 1/2 ρV generated by airfoil forward movement 2 C lα The airfoil deformations produced by αs cancel each other out.
Claims (3)
1. A stationary airfoil flutter ground test apparatus, comprising:
the test system comprises a ground power system, a test mounting platform and an airfoil test bench;
the test mounting platform is arranged on a ground power system, the ground power system provides horizontal plane rotation power for the test mounting platform, the airfoil test bench is arranged on the test mounting platform, the distance between the airfoil test bench and the rotating shaft and the angle of the airfoil test bench are adjustable, the flutter test sample piece (9) is arranged on the airfoil test bench,
the ground power system comprises a fixed base (1), a rotating motor (2), a rotating shaft (3) and a rotating frequency controller (4);
the rotating motor (2) is positioned on the fixed base (1), the upper part of the rotating motor (2) is connected with the rotating shaft (3), the rotating shaft (3) is upwards connected with the test mounting platform, the rotating frequency controller (4) is positioned on the rotating motor (2) to control the rotating speed of the rotating motor (2) and further control the rotating speed of the rotating shaft (3),
the test installation platform comprises a rotating platform (5) driven by a rotating shaft (3) and sliding adjustment grooves (6) symmetrically arranged on the rotating platform (5),
the airfoil test bed comprises a sliding base (7) arranged on a rotating platform (5), an angle adjusting groove (8) is arranged on the sliding base (7), a flutter test sample piece (9) is arranged on the sliding base (7),
further comprises:
the test system comprises a sensor (14) arranged on a flutter test sample piece (9), vibration signals measured by the sensor (14) are transmitted to a signal collector (16) through a first lead (15), the signal collector (16) transmits the signals to a rotating frequency controller (4) through a second lead (17),
further comprises:
the dynamic balance adjusting system comprises a sliding base (10) arranged on a test mounting platform (5), wherein an upright post (11) is vertically arranged on the sliding base (10), a stop groove (12) is formed in the upright post (11), and a counterweight (13) is arranged on the upright post (11) and is fixed in position through a limit bolt in the stop groove (12).
2. A stationary airfoil flutter ground test method based on the stationary airfoil flutter ground test apparatus of claim 1, comprising:
step 1, moving a sliding base to be away from the center of a circle of a test mounting platform on a test benchThe position is fixed, a flutter test sample is connected to the sliding base, a sensor and a wire are arranged on the flutter test sample, and after the flutter test sample and the test system are installed, the dynamic balance adjusting system is fixed to a distance away from the center of the circle of the installation platform>The position is provided with a counterweight to be installed and fixed according to the weight characteristic of the airfoil test bench, and after all preparations are completed, the test installation platform is driven to rotate through a ground power system, and the rotation frequency is +.>Is regulated by a rotation frequency controller, along with the increase of the rotation frequency, until the test piece generates unstable divergent oscillation, at the moment +.>Namely, the vibration speed +.>
3. A method of stationary airfoil flutter ground test as set forth in claim 2, further comprising:
step 2, by rotating the frequencyRadius of rotation->The combination adjustment of the device realizes the flutter test under different deformation states; at this time, the deformation of the airfoil and the centrifugal force Mω generated by the rotation of the airfoil 2 R is directly related; further, by the rotation frequency->Radius of rotation->And the airfoil installation angle alpha are combined and adjusted to realize a flutter test in a deformation-free state; at this time, centrifugal force Mω generated by the rotation of the airfoil 2 R and aerodynamic force 1/2 ρV generated by airfoil forward movement 2 C lα The airfoil deformations produced by αs cancel each other out.
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| CN202011612115.8A CN112857719B (en) | 2020-12-29 | 2020-12-29 | Fixed airfoil flutter ground test device and method |
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| CN202011612115.8A CN112857719B (en) | 2020-12-29 | 2020-12-29 | Fixed airfoil flutter ground test device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115072002A (en) * | 2022-08-02 | 2022-09-20 | 哈尔滨理工大学 | Multifunctional spoiler test bench |
| CN116161213B (en) * | 2023-04-24 | 2023-07-21 | 中国航空工业集团公司沈阳空气动力研究所 | Wing flutter suppression device and method based on piezoelectric energy harvesting module |
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