Impact counting device for flutter test

Abstract

The invention provides an impact counting device for a flutter test, and the device is characterized in that an insulating glue coating layer and a conductive film are sequentially arranged on a limiting shaft body of a test airfoil limiting shaft, and insulating glue coating layers and conductive films are sequentially arranged on two side frames of a limiting lock; the two wiring terminals of the counting unit are jointly connected with the conductive film on the limiting shaft body through the wire, and then the two wiring terminals are connected with the conductive films on the frames on the two sides of the limiting lock respectively, so that the phenomenon that a test piece collides with the limiting lock accidentally in the flutter test process can be monitored; statistics of collision times between the test piece and the two sides of the limiting lock is realized, and a basis is provided for flutter test analysis. By applying the technical scheme of the invention, the technical problem that the accidental impact of the test piece and the limiting lock in the flutter test cannot be reliably counted in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of flutter test for aircraft design, and in particular to an impact counting device for flutter test. Background Art

[0002] During the flutter test, a reliable safety mechanism is required to avoid structural damage during the flutter test and the test must be stopped immediately. The safety mechanism is generally designed at a location where the structural vibration amplitude is large. However, in nonlinear flutter tests such as gap nonlinear flutter tests, the structure is allowed to enter the limit cycle flutter and the test will not be stopped. The limit lock of the safety mechanism is generally installed at a location where the structural vibration amplitude is large, and the limit shaft may collide with the limit lock, which is undesirable during the test. Therefore, it is necessary to monitor the collision between the limit shaft and the limit lock, and record the number of limit times to provide a basis for flutter test analysis.

[0003] At present, there are two types of counters on the market, namely manual counters and inductive counters. Manual counters are usually powered by batteries and count by manually pressing buttons, which is time-consuming and laborious, and the recording process is prone to errors. Inductive counters count by blocking the light path. This type of counter requires a large installation space and requires the light path to be completely blocked. It is not suitable for vibration testing and may lead to omissions and misrecording. Summary of the invention

[0004] The present invention provides an impact counting device for a flutter test, which can solve the technical problem in the prior art that the unexpected impacts between a test piece and a limit lock in a flutter test cannot be reliably counted.

[0005] According to one aspect of the present invention, there is provided an impact counting device for a flutter test, the device comprising:

[0006] Support plate;

[0007] A driving unit, the driving unit is arranged on the supporting plate and is used to provide driving force;

[0008] A limit slider, which is arranged on the support plate and has a guide groove;

[0009] A test wing surface limiting shaft, the test wing surface limiting shaft comprises a limiting shaft body and a first insulating glue coating layer and a first conductive film sequentially arranged on the limiting shaft body from the inside to the outside;

[0010] A limit lock, wherein the limit lock has a limit plate and a mounting plate connected at an angle, the limit lock is connected to the drive unit through the mounting plate, and is slidably matched with the guide groove through the limit plate, the limit plate has a rectangular hole, an oblong hole and a transition hollow section for connecting the rectangular hole and the oblong hole, the oblong hole and the rectangular hole, the width of the rectangular hole is greater than the diameter of the oblong hole, the diameter of the oblong hole is equal to the diameter of the test wing surface limit axis, during a normal flutter test, the test wing surface limit axis is arranged in the rectangular hole, when the flutter test is abnormal, the limit plate slides along the guide groove under the push of the driving force, and the test wing surface limit axis enters the oblong hole through the transition hollow section to be locked, the rectangular hole has a first frame and a second frame which are parallel to the driving force direction and arranged oppositely, a second insulating glue coating layer and a second conductive film are sequentially arranged on the first frame from the inside to the outside, and a third insulating glue coating layer and a third conductive film are sequentially arranged on the second frame from the inside to the outside;

[0011] A counting unit, the counting unit comprises a first terminal, a second terminal, a first digital tube, a second digital tube, a first reset button and a second reset button, the first terminal and the second terminal are both connected to the first conductive film through a wire, the first terminal is connected to the second conductive film through a wire, the second terminal is connected to the third conductive film through a wire, the first digital tube is respectively connected to the first reset button and the first terminal, the first digital tube is used to increase a count value each time the wing surface limit shaft impacts the first frame during the flutter test, the first reset button is used to clear the count value of the first digital tube, the second digital tube is respectively connected to the second reset button and the second terminal, the second digital tube is used to increase a count value each time the wing surface limit shaft impacts the second frame during the flutter test, and the second reset button is used to clear the count value of the second digital tube.

[0012] Furthermore, the thickness of the first conductive film, the second conductive film and the third conductive film is no more than 0.2 mm.

[0013] Further, the thickness of the second conductive film is equal to the thickness of the third conductive film.

[0014] Further, the first conductive film, the second conductive film and the third conductive film are all metal films.

[0015] Furthermore, the driving unit is a cylinder.

[0016] Furthermore, the matching mode between the limiting plate and the guide groove is a clearance match, and the value range of the clearance size is 0.15 to 0.25 mm.

[0017] By applying the technical solution of the present invention, an impact counting device for flutter test is provided. The device sequentially arranges an insulating glue coating layer and a conductive film on the limit shaft body of the test wing surface limit shaft, and sequentially arranges an insulating glue coating layer and a conductive film on both side frames of the limit lock, and uses two wiring terminals of the counting unit to connect with the conductive film on the limit shaft body through wires, and then uses the two wiring terminals to connect with the conductive films on both side frames of the limit lock, respectively, so as to monitor the accidental collision between the test piece and the limit lock during the flutter test, realize the statistics of the collision times between the test piece and the two sides of the limit lock, and provide a basis for flutter test analysis. The device is easy to implement, simple to operate, small in size, and highly reliable. It can also be used to monitor the contact phenomenon of other two or more structures, and has certain versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic structural diagram of an impact counting device for a flutter test provided according to a specific embodiment of the present invention is shown;

[0020] Figure 2 It shows a schematic structural diagram of a test wing surface limit shaft provided according to a specific embodiment of the present invention;

[0021] Figure 3 Shows Figure 2 A side view of the test airfoil limiting axis in FIG.

[0022] Figure 4 It shows a schematic structural diagram of a limit lock provided according to a specific embodiment of the present invention;

[0023] Figure 5 Shows Figure 4 Sectional view of section AA;

[0024] Figure 6 Shows Figure 4 Sectional view of the middle BB section;

[0025] Figure 7 A schematic structural diagram of a counting unit provided according to a specific embodiment of the present invention is shown;

[0026] Figure 8 Shows Figure 7 Front view of the middle counting unit;

[0027] Fig. 9 Shows Figure 7 Left view of the middle counting unit;

[0028] Fig.10 A schematic diagram showing the matching relationship between a limit lock and a limit slider provided according to a specific embodiment of the present invention is shown. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0032] like Figure 1 , Figure 2 , Figure 4 and Figure 7 As shown, according to a specific embodiment of the present invention, an impact counting device for a flutter test is provided, the device comprising:

[0033] Support plate 10;

[0034] A driving unit 20, which is disposed on the supporting plate 10 and is used to provide a driving force;

[0035] A limiting slider 30, which is disposed on the support plate 10, and a guide groove 31 is provided on the limiting slider 30;

[0036] The test wing surface limiting shaft 40 comprises a limiting shaft body 41 and a first insulating glue coating layer 42 and a first conductive film 43 which are sequentially arranged on the limiting shaft body 41 from the inside to the outside;

[0037] The limit lock 50 has a limit plate 51 and a mounting plate 52 connected at an angle. The limit lock 50 is connected to the drive unit 20 through the mounting plate 52, and is slidably matched with the guide groove 31 through the limit plate 51. The limit plate 51 has a rectangular hole 511, an oblong hole 512, and a transition hollow section 513 for connecting the rectangular hole 511 and the oblong hole 512. The width of the oblong hole 512 and the rectangular hole 511 are greater than the diameter of the oblong hole 512. The diameter of the oblong hole 512 is equal to the diameter of the test wing surface limit shaft 40. During the normal flutter test, the test wing surface limit shaft 40 is arranged in the rectangular hole 511. When the flutter test is abnormal, the limit plate 51 slides along the guide groove 31 under the push of the driving force, and the test wing surface limit shaft 40 enters the oblong hole 512 through the transition hollow section 513 to be locked. The rectangular hole 511 has a first frame 511a and a second frame 511b that are parallel to the driving force direction and opposite to each other. The first frame 511a is provided with a second insulating glue coating layer 511aa and a second conductive film 511ab in sequence from the inside to the outside, and the second frame 511b is provided with a third insulating glue coating layer and a third conductive film in sequence from the inside to the outside.

[0038] The counting unit 60 includes a first terminal 61, a second terminal 62, a first digital tube 63, a second digital tube 64, a first reset button 65 and a second reset button 66. The first terminal 61 and the second terminal 62 are both connected to the first conductive film 43 through a wire, the first terminal 61 is connected to the second conductive film 511ab through a wire, the second terminal 62 is connected to the third conductive film through a wire, the first digital tube 63 is respectively connected to the first reset button 65 and the first terminal 61, the first digital tube 63 is used to increase a count value each time the wing surface limit axis impacts the first frame 511a during the flutter test, the first reset button 65 is used to clear the count value of the first digital tube 63, the second digital tube 64 is respectively connected to the second reset button 66 and the second terminal 62, the second digital tube 64 is used to increase a count value each time the wing surface limit axis impacts the second frame 511b during the flutter test, and the second reset button 66 is used to clear the count value of the second digital tube 64.

[0039] By using this configuration, an impact counting device for flutter test is provided. The device sequentially arranges an insulating glue coating layer and a conductive film on the limit shaft body of the test wing surface limit shaft, and sequentially arranges an insulating glue coating layer and a conductive film on both side frames of the limit lock 50. The two terminals of the counting unit are connected to the conductive film on the limit shaft body through wires, and the two terminals are respectively connected to the conductive films on the two side frames of the limit lock. The device can monitor the accidental collision between the test piece and the limit lock during the flutter test, and realize the statistics of the number of collisions between the test piece and the two sides of the limit lock, providing a basis for the flutter test analysis. The device is easy to implement, simple to operate, small in size, and highly reliable. It can also be used to monitor the contact phenomenon of two or more other structures, and has certain versatility. Compared with the prior art, the technical solution of the present invention can solve the technical problem that the prior art cannot reliably count the accidental impacts between the test piece and the limit lock in the flutter test.

[0040] In the above embodiment, the limiting shaft body 41 in the test airfoil limiting shaft 40 is a part of the structure on the flutter test piece (test airfoil). Figure 2 and Figure 3 In one embodiment of the present invention, an insulating adhesive is first applied to the limit shaft body 41 to form an insulating adhesive film, and then a conductive film is adhered to the insulating adhesive film. In order to achieve connection with the first terminal 61 and the second terminal 62, a cable (conductor) is welded on the conductive film near one end of the wing surface and connected to the terminal outside the test piece, such as Figure 370. In another embodiment of the present invention, since the limit shaft 41 is usually made of metal, the limit shaft body 41 is not coated with insulating glue or conductive film, and the wire is directly welded on the limit shaft 41 and connected to the terminal of the counting unit, which has higher reliability.

[0041] Please refer to Figure 4 , Figure 5 and Figure 6 In one embodiment of the present invention, insulating glue is coated on the two side shafts of the limit lock 50 to form an insulating glue film, and then a conductive film is adhered to the insulating glue film, and wires are respectively led out from the conductive films on both sides and connected to the first wiring terminal 61 and the second wiring terminal 62, such as Figure 4 80 and 90. In another embodiment of the present invention, a wire insulated from the limit lock 50 is used to replace the conductive film inside the limit lock 50. The wire is preliminarily reliably connected to both sides of the limit lock, and the conductive cable is exposed on the side of the wire facing the test wing limit shaft 40 and the insulation layer is scraped off.

[0042] Furthermore, in the above embodiment, in order to ensure the reliability of counting, the thickness of the first conductive film 43, the second conductive film 511ab and the third conductive film are not more than 0.2 mm, and the thickness of the second conductive film 511ab is equal to the thickness of the third conductive film. The material of the conductive film is determined according to actual conditions. As a specific embodiment of the present invention, the first conductive film 43, the second conductive film 511ab and the third conductive film are all metal films.

[0043] In addition, in the embodiment of the present invention, the driving unit 20 is a cylinder, and the cylinder is connected to the limit lock 50. The limit lock 50 can slide in the guide groove 31 of the limit slider 30 under the push of the cylinder, and the matching mode of the limit plate 51 and the guide groove 31 is a clearance match, such as Fig.10 The gaps d1 and d2 are shown in the figure, and the gap size ranges from 0.15 to 0.25 mm, for example, 0.2 mm. This configuration can ensure reliable movement of the limit lock 50 and limit the left and right swing displacement of the limit lock 50.

[0044] Furthermore, the counting unit 60 further includes a switch 67, a housing 68 and an interface 69. The first wiring terminal 61, the second wiring terminal 62, the first digital tube 63, the second digital tube 64, the first reset button 65, the second reset button 66, the switch 67 and the interface 69 are all arranged on the housing 68. The power supply of the digital tube and the internal circuit is controlled by the switch 67. As a specific embodiment of the present invention, Figure 8 and 9As shown, the interface 69 adopts the Type C universal electrical interface, the external power supply is universal, for example, a universal mobile phone charging DC 5V power supply can be used, the first digital tube 63 and the second digital tube 64 are 4-digit digital tubes, the shell 68 is a rectangular structure, the first reset button 65 and the second reset button 66 are flush with the outer surface of the shell 68, and the switch 67 is exposed on the upper surface of the shell 68 in the open circuit state. When it is turned on, it is pressed and flush with the outer surface of the shell 68 to prevent accidental touch.

[0045] During debugging, shake the wing surface test piece so that the limit shaft of the test piece contacts the two sides of the limit lock 50. The digital tube displays normally and records the limit lock positions where the two digital tubes contact. During the test, the wing surface vibrates. When the digital tube displays a non-zero number, it indicates that the limit shaft of the test piece has contacted the safety mechanism. The displayed number is the number of contacts. The two digital tubes record the number of contacts between the limit shaft and the two sides of the limit lock. When the first reset button is pressed, the first digital tube displays 0 and the displayed number is re-recorded; when the second reset button is pressed, the second digital tube displays 0.

[0046] In summary, the present invention provides an impact counting device for flutter test, which sequentially arranges an insulating glue coating layer and a conductive film on the limit shaft body of the test wing surface limit shaft, and sequentially arranges an insulating glue coating layer and a conductive film on both side frames of the limit lock 50, uses two wiring terminals of the counting unit to connect with the conductive film on the limit shaft body through wires, and then uses the two wiring terminals to connect with the conductive films on both side frames of the limit lock, so as to monitor the accidental collision between the test piece and the limit lock during the flutter test, realize the statistics of the number of collisions between the test piece and the two sides of the limit lock, and provide a basis for flutter test analysis. The device is easy to implement, simple to operate, small in size, and highly reliable. It can also be used to monitor the contact phenomenon of other two or more structures, and has certain versatility. Compared with the prior art, the technical solution of the present invention can solve the technical problem that the prior art cannot reliably count the accidental impacts between the test piece and the limit lock in the flutter test.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An impact counting device for a flutter test, characterized in that: The device comprises: Support plate (10); a driving unit (20), the driving unit (20) being arranged on the supporting plate (10) and being used for providing a driving force; A limiting slider (30), wherein the limiting slider (30) is arranged on the supporting plate (10), and a guide groove (31) is provided on the limiting slider (30); A test wing surface limiting shaft (40), the test wing surface limiting shaft (40) comprising a limiting shaft body (41) and a first insulating glue coating layer (42) and a first conductive film (43) sequentially arranged on the limiting shaft body (41) from the inside to the outside; A limit lock (50), wherein the limit lock (50) comprises a limit plate (51) and a mounting plate (52) connected at an angle, wherein the limit lock (50) is connected to the drive unit (20) via the mounting plate (52), and is slidably matched with the guide groove (31) via the limit plate (51), wherein the limit plate (51) comprises a rectangular hole (511), an oblong hole (512), and a transition hollow section (513) for connecting the rectangular hole (511) and the oblong hole (512), wherein the width of the oblong hole (512) and the rectangular hole (511) are greater than the diameter of the oblong hole (512), and the diameter of the oblong hole (512) is equal to the diameter of the test wing surface limit axis (40), and the normal flutter test When the flutter test is abnormal, the test wing surface limiting shaft (40) is arranged in the rectangular hole (511); when the flutter test is abnormal, the limiting plate (51) slides along the guide groove (31) under the push of the driving force, and the test wing surface limiting shaft (40) enters the oblong hole (512) through the transition hollow section (513) to be locked; the rectangular hole (511) has a first frame (511a) and a second frame (511b) which are parallel to the driving force direction and arranged opposite to each other; the first frame (511a) is provided with a second insulating glue coating layer (511aa) and a second conductive film (511ab) in sequence from the inside to the outside; the second frame (511b) is provided with a third insulating glue coating layer and a third conductive film in sequence from the inside to the outside; A counting unit (60), the counting unit (60) comprising a first wiring terminal (61), a second wiring terminal (62), a first digital tube (63), a second digital tube (64), a first reset button (65) and a second reset button (66), the first wiring terminal (61) and the second wiring terminal (62) are both connected to the first conductive film (43) through a wire, the first wiring terminal (61) is connected to the second conductive film (511ab) through a wire, the second wiring terminal (62) is connected to the third conductive film through a wire, the first digital tube (63) is connected to the first reset button (65) and the first wiring terminal (61), respectively. The first digital tube (63) is connected to the second terminal (61), the first digital tube (63) is used to increase a count value each time the wing surface limit axis impacts the first frame (511a) during the flutter test, the first reset button (65) is used to clear the count value of the first digital tube (63), the second digital tube (64) is connected to the second reset button (66) and the second wiring terminal (62) respectively, the second digital tube (64) is used to increase a count value each time the wing surface limit axis impacts the second frame (511b) during the flutter test, and the second reset button (66) is used to clear the count value of the second digital tube (64).

2. The device according to claim 1, characterized in that The thickness of the first conductive film (43), the second conductive film (511ab) and the third conductive film is no more than 0.2 mm.

3. The device according to claim 2, characterized in that The thickness of the second conductive film (511ab) is equal to the thickness of the third conductive film.

4. The device according to claim 3, characterized in that The first conductive film (43), the second conductive film (511ab) and the third conductive film are all metal films.

5. The device according to claim 1, characterized in that The driving unit (20) is a cylinder.

6. The device according to any one of claims 1 to 4, characterized in that The matching mode between the limiting plate (51) and the guide groove (31) is clearance matching, and the value range of the clearance size is 0.15-0.25 mm.

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