A wind tunnel test model putty adhesion effect verification method and device

Abstract

The present invention relates to the field of wind tunnel test technology, and provides a method and device for verifying the adhesion effect of putty on a wind tunnel test model. The method is as follows: a plurality of points along the edge of a model wiring trough are selected as model marking points on an established wind tunnel test model; the deformation of the model wiring trough area under a target test load is calculated using finite element analysis software, and the displacement data of each model marking point is recorded; a sample is then designed based on the displacement data of each model marking point to simulate the stiffness and structure of the model wiring trough area; the sample wiring trough on the sample is then pre-embedded with embedded parts and filled and reshaped with putty; finally, one end of the sample is fixed, and a load is applied to the other end of the sample to cause the sample to be directional and quantitatively bent, and the putty adhesion effect is observed and verified. The present invention provides data support for the adhesion effect of wiring troughs and putty for the structural design, manufacturing, and processing of wind tunnel test models, and has a significant auxiliary effect on aircraft design.

Description

Technical Field

[0001] The present invention relates to the technical field of wind tunnel testing, and in particular to a method and device for verifying the adhesion effect of putty on a wind tunnel test model. Background Art

[0002] Putty is a frequently used material for wind tunnel test models. Certain thinner areas of the model require the placement of embedded components (such as pressure gauges, conduits, wiring harnesses, sensors, and other components). Due to the thinness of these areas, wiring covers are often not possible, and open wiring troughs must be used to arrange the embedded components and wiring. In these situations, putty is used to fill the wiring troughs to prevent the embedded components from being exposed. Simultaneously, streamlining the putty surface and the model surface can reduce damage to the model surface caused by holes and grooves, maintain the integrity of the model's aerodynamic shape, and obtain more realistic and accurate test data.

[0003] During the test, the adhesion of putty must be ensured to prevent blistering, delamination, breakage, and shedding, which could affect the accuracy of the test data. However, there is currently no method specifically designed to verify the adhesion of putty in wind tunnel test models. Therefore, how to verify the adhesion of putty is an urgent problem in this field. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and device for verifying the adhesion effect of putty in a wind tunnel test model, so as to achieve the purpose of verifying the adhesion effect of putty after deformation.

[0005] The present invention is achieved through the following technical solutions:

[0006] A method for verifying the adhesion effect of putty in a wind tunnel test model comprises the following steps:

[0007] S1. Establish a wind tunnel test model to be verified, and select several points along the edge of the model wiring trough as model marking points;

[0008] S2. Use finite element analysis software to calculate the deformation of the model wiring trough area under the target test load and record the displacement data of each model mark point;

[0009] S3. Based on the displacement data of each model marking point, a sample is designed with a stiffness consistent with the model wiring trough area. The sample has a sample wiring trough consistent with the model wiring trough, and sample marking points are marked on the sample at the corresponding model marking points;

[0010] S4. Pre-embed the embedded parts and fill and modify the wiring trough on the sample with putty;

[0011] S5. Fix one end of the sample and apply a load to the other end of the sample to perform directional and quantitative bending of the sample, and record the displacement data of each sample mark point on the sample until the displacement data of each sample mark point is consistent with the displacement data of the corresponding model mark point in step S2;

[0012] S6. Check the adhesion of putty.

[0013] Optionally, before step S6, the use environment of putty is simulated.

[0014] The present invention also provides a wind tunnel test model putty adhesion effect verification device, which adopts any of the verification methods described above, including a workbench, a clamping component and a loading component, the clamping component and the loading component are arranged on the top of the workbench, one end of the sample is clamped and fixed by the clamping component, and the loading component is used to apply a load to the other end of the sample to cause it to be bent.

[0015] Optionally, the sample has a clamping section, a simulation section and a force-bearing section, the clamping section is arranged at one end of the simulation section, and the force-bearing section is arranged at the other end of the simulation section; the clamping section is used to be clamped and fixed by the clamping component, the simulation section is used to simulate the stiffness of the model wiring trough area and the model wiring trough structure, and the force-bearing section is used to bear the load applied by the loading component.

[0016] Optionally, the clamping component includes a support platform and a fixing plate, the support platform is fixedly arranged, and the fixing plate and the support platform are connected by fasteners to clamp and fix the clamping section between the fixing plate and the support platform.

[0017] Optionally, a positioning groove capable of cooperating with the clamping section is provided on the top of the support platform to limit the position of the sample.

[0018] Optionally, the loading component includes a pressure plate, a force nut, a guide rod with a thread on the top and a height-adjustable support member, one end of the pressure plate is pressed on the support member, and the other end of the pressure plate is pressed on the end of the force-bearing section. A strip hole is provided in the middle of the pressure plate, and the guide rod passes through the strip hole. The force nut is connected to the guide rod and presses the pressure plate, so that the sample is bent by the downward displacement of the force nut.

[0019] Optionally, a semi-cylindrical boss for contacting the pressure plate is provided at the end of the force-bearing section.

[0020] Optionally, the supporting member is a jack.

[0021] Optionally, a T-shaped slot is provided on the workbench, and the guide rod is a bolt, and the head of the bolt is arranged in the T-shaped slot.

[0022] The technical solution of the present invention has at least the following advantages and beneficial effects: In the present invention, several points are selected along the edge of the model wiring trough on the established wind tunnel test model as model marking points, and the deformation of the model wiring trough area under the target test load is calculated by finite element analysis software, and the displacement data of each model marking point is recorded; then, according to the displacement data of each model marking point, a sample is designed to simulate the stiffness of the model wiring trough area and the model wiring trough structure; then, the sample wiring trough on the sample is pre-embedded with embedded parts and filled and reshaped with putty; finally, one end of the sample is fixed, and a load is applied to the other end of the sample to make the sample bend in a direction and quantitatively, thereby achieving the purpose of verifying the adhesion effect of the putty, providing data support for the adhesion effect of the wiring trough and putty for the structural design, manufacturing and processing of the wind tunnel test model, which has a great auxiliary effect on the design of the aircraft and has positive significance for promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a wing model in the prior art;

[0024] Figure 2 It is a structural diagram of the sample;

[0025] Figure 3 A schematic structural diagram of a wind tunnel test model putty adhesion effect verification device provided by the present invention;

[0026] Figure 4 Schematic diagram of the structure of the support platform;

[0027] Figure 5 It is a structural diagram of the pressing plate;

[0028] Figure 6 This is an initial state diagram of a wind tunnel test model putty adhesion effect verification device provided by the present invention;

[0029] Figure 7 for Figure 6 The state diagram of the sample after being bent;

[0030] Figure markings: 1-sample, 101-simulation section, 1011-sample wiring groove, 102-clamping section, 103-force section, 1031-semi-cylindrical boss, 2-putty, 3-pressure measuring tube, 4-fixing plate, 5-support platform, 501-positioning groove, 6-workbench, 601-T-slot, 7-support member, 8-pressure plate, 801-bar hole, 9-guide rod, 10-force nut, 11-wing model, 1101-model wiring groove. DETAILED DESCRIPTION

[0031] In this embodiment, the wind tunnel test model is a wing model 11, the embedded component is a pressure measuring tube 3, and the use environment of the putty 2 is low temperature (for example, in a low-temperature wind tunnel test model). It should be understood that in other embodiments, the verification method and device provided by the present invention can certainly be used on other models, the embedded component can certainly be other components described in the background art, and the use environment of the putty 2 is certainly not limited to low temperatures.

[0032] A method for verifying the adhesion effect of putty in a wind tunnel test model comprises the following steps:

[0033] S1. Establish the wind tunnel test model to be verified (i.e. Figure 1 The wing model 11 shown is easy to understand, and only part of the model is captured in the figure for display). Several points are selected along the edge of the model wiring trough 1101 on the model as model marking points. It is easy to understand that the selected positions and number of the model marking points should be able to roughly cover the changing trend of the model wiring trough 1101, that is, the range of possible deformation of the model wiring trough 1101 should be covered. In practical applications, the number of model marking points is greater than or equal to five. In this embodiment, as an option, six model marking points are selected, which are recorded as P', A', B', C', D' and E' in the direction in which the wing gradually becomes thinner.

[0034] S2. Use finite element analysis software to calculate the deformation of the model wiring trough 1101 area under the target test load and record the displacement data of each model mark point.

[0035] S3. Based on the displacement data of each model marking point (easy to understand, the stiffness can be inversely calculated based on the deformation), a sample 1 with the same stiffness as the model wiring groove 1101 is designed. The sample 1 has a sample wiring groove 1011 that is consistent with the model wiring groove 1101, and the sample marking point is marked on the sample 1 at the corresponding model marking point. It should be understood that the position of the sample marking point relative to the sample wiring groove 1011 is completely consistent with the position of the model marking point relative to the model wiring groove 1101 in height. The sample marking point is allowed to translate in the length direction perpendicular to the sample wiring groove 1011 so that the sample marking point is at the edge of the sample 1 for easy measurement. The corresponding model marking points are recorded as P, A, B, C, D and E (such as Figure 2 shown).

[0036] S4. Pre-embed the embedded parts in the sample wiring groove 1011 on the sample 1 and fill and reshape it with putty 2. That is, in this embodiment, the pressure measuring tube 3 is pre-embedded inside the sample wiring groove 1011 and the pressure measuring tube 3 is passed through the wiring hole of the sample 1, and the sample wiring groove 1011 is filled and reshaped with low-temperature resistant putty 2.

[0037] S5. Fix one end of the sample 1 and apply a load to the other end of the sample 1 to make the sample 1 bend in a directional and quantitative manner, and record the displacement data of each sample 1 mark point on the sample 1 until the displacement data of each sample 1 mark point is consistent with the displacement data of the corresponding model mark point in step S2, that is, the sample 1 simulates the actual deformation in the wind tunnel test model.

[0038] S6. Check the adhesion effect of putty 2, that is, check whether putty 2 and sample 1 have any phenomena such as falling off, bulging, or separation. In actual application, multiple tests are performed to improve test accuracy.

[0039] As can be seen from the above, the present invention selects several points along the edge of the model wiring groove 1101 on the established wind tunnel test model as model marking points, and uses finite element analysis software to calculate the deformation of the model wiring groove 1101 area under the target test load, and records the displacement data of each model marking point; then, based on the displacement data of each model marking point, designs a sample 1 to simulate the stiffness of the model wiring groove 1101 area and the structure of the model wiring groove 1101; then, the sample wiring groove 1011 on the sample 1 is pre-embedded with embedded parts and filled and reshaped with putty 2; finally, one end of the sample 1 is fixed, and a load is applied to the other end of the sample 1, so that the sample 1 is directional and quantitatively bent, thereby achieving the purpose of verifying the adhesion effect of putty 2, providing data support for the adhesion effect of the wiring groove and putty 2 for the structural design, manufacturing and processing of the wind tunnel test model, which has a great auxiliary effect on the design of the aircraft and has positive significance for promotion and use.

[0040] As an option, in this embodiment, before step S6 (i.e., after the sample 1 reaches the target deformation), the use environment of the putty 2 is simulated to improve the accuracy of the verification. On the basis that the use environment of the putty 2 in this embodiment is low temperature, the sample 1 is placed in a closed environment, and liquid nitrogen is introduced to make the closed environment reach the actual use temperature of the putty 2 (in other embodiments, the corresponding use environment is simulated, such as simulating high temperature, high salt fog and other environments). It is easy to understand that in actual application, the adhesion effect verification of the putty 2 is achieved by a corresponding verification device, and the verification device should be placed in an experimental cabin that can be opened and closed to simulate the use environment of the putty 2. Only the verification device itself is introduced below, and the above-mentioned experimental cabin is not described in detail.

[0041] refer to Figure 3 、 Figure 6 and Figure 7The present invention also provides a device for verifying the adhesion effect of putty in a wind tunnel test model, which adopts the above-mentioned verification method. Specifically, the verification device includes a workbench 6, a clamping component, and a loading component. The clamping component and the loading component are arranged on the top of the workbench 6. One end of the sample 1 is clamped and fixed by the clamping component, and the loading component is used to apply a load to the other end of the sample 1 to bend it. As an option, in this embodiment, a T-slot 601 is provided on the workbench 6 to facilitate accommodating the head of the bolt, thereby facilitating the adjustment of the position of the connecting parts. It should be noted that the workbench 6 in the accompanying drawings is only a cutaway representation. In actual application, a plurality of T-slots 601 can be arranged side by side on the workbench 6.

[0042] Reference again Figure 2 As an option, in this embodiment, the sample 1 comprises a clamping section 102, a simulation section 101, and a load-bearing section 103. The clamping section 102 is located at one end of the simulation section 101, and the load-bearing section 103 is located at the other end of the simulation section 101. The clamping section 102 is used to be clamped and fixed, the load-bearing section 103 is used to bear the applied load, and the simulation section 101 is used to simulate the stiffness and structure of the model wiring trough 1101. Furthermore, in this embodiment, the clamping section 102 is a rectangular beam with a uniform cross-section for easy clamping. The load-bearing section 103 is provided at the end with a semi-cylindrical boss 1031 for easy load bearing. The simulation section 101 can achieve the purpose of simulating the stiffness of the model wiring trough 1101 by varying the cross-section parameters (thickness, width, shape, etc.).

[0043] As an option, the specific structure of the clamping component in this embodiment is as follows: the clamping component includes a support platform 5 and a fixing plate 4. The support platform 5 is fixedly arranged on the basis of the T-shaped slot 601 provided on the workbench 6. The support platform 5 is fixed by bolts and nuts. The head of the bolt is placed in the T-shaped slot 601. The shank of the bolt passes through the through hole in the support platform 5 and is locked by the nut. The bolt is preferably a lag bolt to limit its rotation and facilitate tightening the nut. The fixing plate 4 and the support platform 5 are connected by fasteners (preferably screws) to clamp the clamping section 102 between the fixing plate 4 and the support platform 5.

[0044] refer to Figure 4 Furthermore, a positioning groove 501 is provided on the top of the support platform 5, which can cooperate with the clamping section 102 to limit the position of the sample 1. It should be understood that the depth of the positioning groove 501 is slightly smaller than the thickness of the clamping section 102 of the sample 1 to ensure that the fixing plate 4 can clamp the sample 1 after being connected and tightened.

[0045] It should be understood that the above-mentioned structure of the clamping component is only an option and not a limitation. In other embodiments, the clamping component can certainly be clamped and fixed by other means, such as providing two clamping blocks, one of which is fixed, and the other clamping block is clamped and released by a linear displacement drive element (such as a cylinder, an electric push rod, a hydraulic cylinder, etc.); or by providing appropriate force through a pressure device (such as a press) to press the clamping section 102, thereby achieving clamping.

[0046] As an option, in this embodiment, the loading component includes a pressure plate 8, a force nut 10, a guide rod 9 with a thread on the top and a height-adjustable support member 7. One end of the pressure plate 8 is pressed on the support member 7, and the other end of the pressure plate 8 is pressed on the end of the force-bearing section 103. On the basis that the force-bearing section 103 is provided with a semi-cylindrical boss 1031, the semi-cylindrical boss 1031 at the end of the force-bearing section 103 contacts the pressure plate 8. It is worth noting that such an arrangement makes the contact surface between the semi-cylindrical boss 1031 of the force-bearing section 103 and the pressure plate 8 always the top busbar of the semi-cylindrical boss 1031, which can ensure that the direction of the loading force always points to the axis of the semi-cylindrical boss 1031 and also make the loading force transition smoothly.

[0047] A strip hole 801 is provided in the middle of the pressure plate 8, through which the guide rod 9 passes. The force nut 10 is connected to the guide rod 9 and presses the pressure plate 8. Since one end of the pressure plate 8 is supported by the support member 7, by turning the nut downward, the other end of the pressure plate 8 (i.e., the end in contact with the sample 1) will bend the sample 1 downward. In actual application, by turning the nut downward and changing the support height of the support member 7, the sample 1 can achieve the target deformation. Figure 5 As an option, both sides of the pressure plate 8 are chamfered inward and downward, and the other two sides are slightly smaller than the middle section, in order to reduce the loading surface.

[0048] As an option, in this embodiment, a jack is selected as the supporting member 7. Furthermore, based on the T-slot 601 provided on the workbench 6, the guide rod 9 in this embodiment is a bolt, the head of the bolt is set in the T-slot 601, and the bolt is preferably a square head bolt to limit its rotation and facilitate tightening the nut.

[0049] It should be understood that the above-mentioned structure of the loading component and the downward loading method are only an option and not a limitation. In other embodiments, the loading component can of course be in other forms. For example, the loading component selects a pressure device (such as a press) to bend the sample 1 by a downward loading method; another example is that the loading component selects a jack, and the jack is directly pressed under the force-bearing section 103, and the sample 1 is bent by an upward loading method. It is easy to understand that in this way, if the force-bearing section 103 is provided with a semi-cylindrical boss 1031, the sample 1 should be turned over and clamped and fixed, even if the semi-cylindrical boss 1031 is loaded; another example is that the loading component is a combination of a jack and a downward pressing member, and the downward pressing member is fixed on the top of the jack. The downward pressing member presses the sample 1 downward by retracting the jack, thereby bending the sample 1.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A wind tunnel test model putty adhesion effect verification method, characterized in that, The following steps are involved: S1. Establish a wind tunnel test model to be verified, and select several points along the edge of the model wiring trough as model marking points; S2. Use finite element analysis software to calculate the deformation of the model wiring trough area under the target test load and record the displacement data of each model mark point; S3. Based on the displacement data of each model marking point, a sample is designed with a stiffness consistent with the model wiring trough area. The sample has a sample wiring trough consistent with the model wiring trough, and sample marking points are marked on the sample at the corresponding model marking points; S4. Pre-embed the embedded parts and fill and modify the wiring trough on the sample with putty; S5. Fix one end of the sample and apply a load to the other end of the sample to perform directional and quantitative bending of the sample, and record the displacement data of each sample mark point on the sample until the displacement data of each sample mark point is consistent with the displacement data of the corresponding model mark point in step S2; S6. Check the adhesion of putty.

2. The wind tunnel test model putty adhesion effect verification method according to claim 1, characterized in that: Before step S6, the use environment of putty is simulated.

3. A wind tunnel test model putty adhesion effect verification device, using the verification method according to claim 1 or 2, characterized in that: It includes a workbench, a clamping component and a loading component. The clamping component and the loading component are arranged on the top of the workbench. One end of the sample is clamped and fixed by the clamping component, and the loading component is used to apply a load to the other end of the sample to make it bend.

4. The wind tunnel test model putty adhesion effect verification device according to claim 3, characterized in that: The sample has a clamping section, a simulation section and a force-bearing section, the clamping section is arranged at one end of the simulation section, and the force-bearing section is arranged at the other end of the simulation section; the clamping section is used to be clamped and fixed by the clamping component, the simulation section is used to simulate the stiffness of the model wiring trough area and the model wiring trough structure, and the force-bearing section is used to bear the load applied by the loading component.

5. The wind tunnel test model putty adhesion effect verification device according to claim 4, characterized in that: The clamping component includes a support platform and a fixed plate. The support platform is fixedly arranged. The fixed plate and the support platform are connected by fasteners to clamp and fix the clamping section between the fixed plate and the support platform.

6. The wind tunnel test model putty adhesion effect verification device according to claim 5, characterized in that: The top of the support platform is provided with a positioning groove which can cooperate with the clamping section and is used to limit the position of the sample.

7. The wind tunnel test model putty adhesion effect verification device according to claim 4, characterized in that: The loading component includes a pressure plate, a force nut, a guide rod with a thread on the top and a height-adjustable support member. One end of the pressure plate is pressed on the support member, and the other end of the pressure plate is pressed on the end of the force-bearing section. A strip hole is provided in the middle of the pressure plate, and the guide rod passes through the strip hole. The force nut is connected to the guide rod and presses the pressure plate so that the sample is bent by the downward displacement of the force nut.

8. The wind tunnel test model putty adhesion effect verification device according to claim 7, characterized in that: The end of the force-bearing section is provided with a semi-cylindrical boss for contacting the pressure plate.

9. The wind tunnel test model putty adhesion effect verification device according to claim 7, characterized in that: The supporting member is a jack.

10. The wind tunnel test model putty adhesion effect verification device according to claim 7, characterized in that: The workbench is provided with a T-shaped slot, the guide rod is a bolt, and the head of the bolt is arranged in the T-shaped slot.

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