Large slenderness ratio force measurement test model structure
By using a transition column section to connect the warhead and the tail in the large-length and thin-ratio force measurement test model, and independently process the balance cone holes in it, the processing error problem caused by its own moment of inertia in the prior art is solved, and the processing accuracy and test data quality are improved. At the same time, the fastening form of positioning blocks and screws is adopted to avoid assembly errors caused by wear and improve structural stability and processing efficiency.
Patent Information
- Application Number
- CN202420969794.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-05-07
AI Technical Summary
When the existing large-length and thin-ratio force measurement test model rotates at high speed, the machining error caused by its own moment of inertia causes high processing difficulty and low accuracy. The traditional pin positioning form is severely worn after frequent disassembly, and the positioning accuracy becomes poor.
The transition column section is used to connect the warhead and the tail, and the balance cone hole is independently designed and processed in the transition column section to simplify the elastic body structure and improve stiffness; the fastening form of positioning blocks and screws is adopted to avoid assembly errors caused by wear.
The machining accuracy of the large-length and fine-level force measurement test model is greatly improved, the structural design is simplified, the processing cost is reduced, and the quality of wind tunnel test data is improved.
Smart Images
Figure CN222579573U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a large slenderness ratio force measurement test model structure, which is used for a large slenderness ratio force measurement model wind tunnel test. Background Art
[0002] The design of the test model is an important part of the wind tunnel test. The quality of its structural design not only directly determines the processing efficiency and accuracy of the model, but also affects the quality of the wind tunnel test data. The structural design of the conventional force measurement wind tunnel test model is basically divided into two parts: the projectile and the body, which are designed and processed separately. The balance cone hole is processed in the inner cavity of the body to cooperate with the balance system. However, for test models with a large aspect ratio and a long body, the complex body structure will greatly increase the processing difficulty and cost, and will also reduce the processing accuracy of the test model.
[0003] With the development of wind tunnel test technology for large aspect ratio models, more stringent requirements are placed on the design of large aspect ratio wind tunnel test models, mainly in simplifying the structural design of the projectile body and improving the model processing accuracy and efficiency.
[0004] like Figure 1 As shown in the figure, the existing large aspect ratio test model still retains the design method of the conventional force measurement wind tunnel test model, which separates the bullet head and the bullet body, and processes a balance cone hole in the inner cavity of the bullet body for the cooperation of the balance system. However, for processing, the long bullet body will produce large disturbance deformation under the influence of its own rotational inertia under high-speed rotation, resulting in swinging. It is difficult to ensure the process requirements for processing high-precision cone holes in the inner cavity of a long bullet body. Utility Model Content
[0005] The technical problem solved by the present application is: to overcome the deficiencies of the prior art and provide a large slenderness ratio force measurement test model structure for use in wind tunnel tests of large slenderness ratio force measurement models, which has a simple structure and is easy to manufacture, and greatly improves the machining accuracy of large slenderness ratio force measurement test models.
[0006] This patent independently designs the complex inner cavity of the projectile body, shortens the processing size of the complex structure, and increases the rigidity, which can effectively avoid the processing error caused by the rotational inertia of the large aspect ratio model when it rotates at high speed.
[0007] The technical solutions provided by this application are as follows:
[0008] A large slenderness ratio force measurement test model structure comprises a bullet nose section, a transition column section, a bullet body section and a measuring balance. The transition column section is provided with a balance taper hole, the end of the measuring balance cooperates with the balance taper hole, and the end of the measuring balance is connected to the transition column section. The bullet nose section and the bullet body section are respectively sleeved on the two ends of the transition column section.
[0009] The outer circumferential surface of the transition column section is provided with a convex ring, the body section is sleeved on one end outside the transition column section and the end of the body section contacts the convex ring, the nose section is sleeved on the other end outside the transition column section and the end of the nose section contacts the convex ring.
[0010] The end of the bullet section sleeved outside the transition column section is provided with a first positioning groove, the convex ring is provided with a second positioning groove, and positioning blocks are clamped in the first positioning groove and the second positioning groove. The positioning blocks are used to locate the circumferential installation positions of the bullet section and the transition column section.
[0011] Screws are arranged between the warhead section and the transition column section, and between the positioning block and the transition column section. The screws pass through the positioning block and are threadedly connected to the transition column section, and the screws pass through the warhead section and are threadedly connected to the transition column section.
[0012] The transition column section is provided with a cylindrical hole, the small diameter end of the balance cone hole is connected with one end of the cylindrical hole, and the diameter of the cylindrical hole is the same as the aperture of the small diameter end of the balance cone hole.
[0013] The screw is located opposite to the small diameter ends of the cylindrical hole and the balance cone hole.
[0014] The transition column section is provided with a mounting hole, which is connected to an end of the cylindrical hole away from the balance cone hole, and the aperture of the mounting hole is larger than the aperture of the cylindrical hole.
[0015] The body section and the transition column section are connected via a positioning pin.
[0016] The transition column section is connected to the measuring balance via a connecting assembly, which includes a balance tightening screw, a gasket and a balance taper sleeve. The balance taper sleeve is sleeved on the outer side of the end of the measuring balance, and the balance taper sleeve is inserted into the balance taper hole. After the balance tightening screw passes through the gasket, the balance tightening screw extends into the balance taper hole and is threadedly connected to the measuring balance.
[0017] In summary, this application at least includes the following beneficial technical effects:
[0018] (1) Compared with the conventional large slenderness ratio force measurement model, the utility model changes the structural design of the projectile body, and independently designs and processes the balance cone hole integrated with the projectile body. The new large slenderness ratio force measurement test model adopts a transition column section to connect the projectile head and the projectile tail, and the balance cone hole is processed in the transition column section. The transition column section is short in size and easy to process, which greatly improves the processing accuracy of the balance cone hole, improves the matching accuracy of the balance cone hole and the balance system, and improves the quality of wind tunnel test data.
[0019] (2) The utility model changes the positioning form of the bullet head and the bullet body, changing the traditional pin positioning to a positioning block plus screw fastening form. The traditional pin combination will be severely worn after the model is frequently disassembled, resulting in poor positioning accuracy of the pin. The positioning block plus screw form increases the contact area and can effectively avoid assembly errors caused by wear.
[0020] (3) The utility model can widely utilize protrusions on the surface of the model or cable covers as positioning blocks, thereby simplifying the structural design and improving processing efficiency.
[0021] (4) The various components of the utility model are mostly connected and fixed by threads, the structure is simple and reliable, the assembly is convenient, and it is suitable for force measurement test models of various sizes and shapes. Moreover, the screws are all standard parts, which are easy to replace. The pins are special accessories and need to be re-installed once they are worn. In addition, when replacing a balance system with a different taper, only one transition column section needs to be processed. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a conventional large aspect ratio force measurement test model structure.
[0023] Figure 2 This is a large aspect ratio force measurement test model structure of the utility model.
[0024] Explanation of the numbers in the attached figures: 1. warhead section; 2. warhead body section; 21. balance tightening screw; 22. balance cone sleeve; 23. measuring balance; 24. balance support rod; 25. positioning pin; 26. gasket;
[0025] 3. Transition column section; 31. Balance cone hole; 32. Cylindrical hole; 33. Mounting hole;
[0026] 4. Positioning block; 41. Screw. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the implementation methods disclosed in the present utility model will be further described in detail below in conjunction with the accompanying drawings.
[0028] Figure 1It is a conventional large aspect ratio force measurement test model structure, and the test model is divided into a warhead section 1 and a body section 2. A balance cone hole 31 is processed in the inner cavity of the body section 2, and it cooperates with the measuring balance 23 through the balance cone sleeve 22. The outer surface of the balance cone sleeve 22 needs to cooperate with the balance cone hole 31, so the processing of the balance cone hole 31 must meet high precision requirements. After the balance system composed of the measuring balance 23, the balance support rod 24, etc. cooperates with the body section 2, it needs to be tightened with the balance tightening screw 21. The balance tightening screw 21 is inserted through one end of the body section 2, and is tightened through the tightening screw 41 gasket 26, the balance cone hole 31, the balance cone sleeve 22 and the screw hole on the balance system. Finally, the warhead segment 1 is installed. The warhead segment 1 is sleeved on the outer side of the end of the body segment 2. At the matching surface of the warhead segment 1 and the body segment 2, a hole is set in the warhead segment 1 and a pin hole is set in the body segment 2. The positioning pin 25 passes through the hole of the warhead segment 1 and is inserted into the pin hole of the body segment 2 for positioning to complete the matching.
[0029] Large aspect ratio: The length to diameter ratio of the experimental model is above 20.
[0030] The present application embodiment discloses a large slenderness ratio force measurement test model structure, such as Figure 2 As shown, it includes a warhead section 1, a positioning block 4, a screw 41, a balance tightening screw 21, a gasket 26, a transition column section 3, a body section 2, a balance cone sleeve 22, a measuring balance 23 and a balance support rod 24.
[0031] A convex ring is provided on the outer circumferential surface of the transition column section 3, the body section 2 is sleeved on one end outside the transition column section 3 and the end of the body section 2 is in contact with the convex ring, the nose section 1 is sleeved on the other end outside the transition column section 3 and the end of the nose section 1 is in contact with the convex ring, and the transition column section 3 is matched with the ends of the nose section 1 and the body section 2 through the convex ring to ensure the consistency and accuracy of the installation position.
[0032] The transition column section 3 is provided with a balance cone hole 31, a cylindrical hole 32 and a mounting hole 33 in sequence along its own axial direction. The small diameter end of the balance cone hole 31 is connected to one end of the cylindrical hole 32, and the mounting hole 33 is connected to the other end of the cylindrical hole 32. The diameter of the cylindrical hole 32 is the same as the aperture of the small diameter end of the balance cone hole 31, and the aperture of the mounting hole 33 is larger than the aperture of the cylindrical hole 32. The balance cone sleeve 22 is sleeved on one end of the measuring balance 23, and the outer side of the balance cone sleeve 22 is inserted into the balance cone hole 31. The balance tightening screw 21 is inserted from one end of the mounting hole 33 of the transition column section 3, and the balance tightening screw 21 passes through the gasket 26, extends into the balance cone sleeve 22 and is connected to the measuring balance 23.
[0033] One end of the balance cone hole 31 of the transition column section 3 is inserted into the body section 2. The body section 2 and the transition column section 3 are connected via a positioning pin 25.
[0034] The end of the bullet section 1 sleeved outside the transition column section 3 is provided with a first positioning groove, the convex ring is provided with a second positioning groove, and the positioning block 4 is clamped in the first positioning groove and the second positioning groove. The positioning block 4, the first positioning groove and the second positioning groove are high-precision machined structures, which ensure the installation accuracy between the bullet section 1 and the transition column section 3. The screw 41 passes through the positioning block 4 and is threadedly connected to the transition column section 3, and the screw 41 passes through the bullet section 1 and is threadedly connected to the transition column section 3, thereby achieving the fixation of the bullet section 1 and the transition column section 3.
[0035] At the position of the cylindrical hole 32 of the transition column section 3, the transition column section 3 has a relatively large wall thickness, and the screw 41 is connected to this position of the transition column section 3, thereby ensuring the connection strength. At the same time, the arrangement of the cylindrical hole 32 and the mounting hole 33 makes the transition column section 3 have a relatively large length, so that the transition column section 3 has a relatively long sleeve length with the body section 2 and the nose section 1, thereby ensuring the connection accuracy and strength.
[0036] Compared with the traditional method of directly machining the balance cone hole 31 in the inner cavity of the body section 2, the present invention adopts the transition column section 3 to connect the nose section 1 and the body section 2. The balance cone hole 31 is separated from the body section 2 and machined in the transition column section 3. The function of the transition column section 3 is to improve the machining accuracy of the balance cone hole 31; the measuring balance 23 is matched with the balance cone hole 31 of the transition column section 3 through the balance cone sleeve 22, and the measuring balance 23 is tightened and fixed to the transition column section 3 through the balance tightening screw 21; the balance system composed of the measuring balance 23, the balance support rod 24, etc., supports the entire model in the wind tunnel through the transition column section 3, and the other end of the balance system is connected to the bracket in the wind tunnel.
[0037] When machining the tapered hole that matches the balance, the traditional model design is to insert the lathe tool from the tail of the model into the inner cavity for machining. However, for the large aspect ratio model, it is difficult for the lathe tool to accurately locate the axis of the inner cavity of the model, and the machining accuracy cannot be guaranteed. The new structure adopts the transition column segment 3 design, which shortens the machining size of the complex segment, can better guarantee the machining accuracy of the tapered hole 31 of the balance, and greatly improves the test accuracy.
[0038] The matching form of the warhead section 1 and the body section 2 is changed from the traditional pin matching to the form of fastening with the positioning block 4 plus the screw 41. The traditional pin matching will be severely worn after the model is frequently disassembled, resulting in poor positioning accuracy of the pin. The positioning block 4 plus the screw 41 form increases the contact area and can well avoid assembly errors caused by wear.
[0039] Most models have protrusions or cable covers on their surfaces. The positioning block 4 can be processed integrally with the cable cover or the protrusion to simplify the structure and improve the design and processing efficiency.
[0040] The utility model has been successfully applied to wind tunnel tests of large slenderness ratio force measurement models for dozens of times, improving the processing accuracy of the model and the quality of wind tunnel test data and shortening the test cycle.
[0041] The contents not described in detail in this application specification belong to the common knowledge of those skilled in the art.
[0042] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.
Claims
1. A large slenderness ratio force measurement test model structure, characterized in that: The invention comprises a warhead section (1), a transition column section (3), a body section (2) and a measuring balance (23); the transition column section (3) is provided with a balance cone hole (31); the end of the measuring balance (23) cooperates with the balance cone hole (31), and the end of the measuring balance (23) is connected to the transition column section (3); the warhead section (1) and the body section (2) are respectively sleeved on the two ends of the transition column section (3).
2. A large slenderness ratio force measurement test model structure according to claim 1, characterized in that: The outer circumferential surface of the transition column section (3) is provided with a convex ring, the body section (2) is sleeved on one end outside the transition column section (3) and the end of the body section (2) contacts the convex ring, and the nose section (1) is sleeved on the other end outside the transition column section (3) and the end of the nose section (1) contacts the convex ring.
3. The large slenderness ratio force measurement test model structure according to claim 1, characterized in that: The end of the bullet section (1) sleeved outside the transition column section (3) is provided with a first positioning groove, the convex ring is provided with a second positioning groove, and positioning blocks (4) are clamped in the first positioning groove and the second positioning groove. The positioning blocks (4) are used to locate the circumferential installation positions of the bullet section (1) and the transition column section (3).
4. A large slenderness ratio force measurement test model structure according to claim 3, characterized in that: A screw (41) is provided between the warhead section (1) and the transition column section (3), and between the positioning block (4) and the transition column section (3); the screw (41) passes through the positioning block (4) and is threadedly connected to the transition column section (3); the screw (41) passes through the warhead section (1) and is threadedly connected to the transition column section (3).
5. A large slenderness ratio force measurement test model structure according to claim 4, characterized in that: The transition column section (3) is provided with a cylindrical hole (32), the small diameter end of the balance cone hole (31) is connected to one end of the cylindrical hole (32), and the diameter of the cylindrical hole (32) is the same as the aperture of the small diameter end of the balance cone hole (31).
6. A large slenderness ratio force measurement test model structure according to claim 5, characterized in that: The screw (41) is located opposite to the small diameter ends of the cylindrical hole (32) and the balance cone hole (31).
7. The large slenderness ratio force measurement test model structure according to claim 5, characterized in that: The transition column section (3) is provided with a mounting hole (33), the mounting hole (33) is connected to one end of the cylindrical hole (32) away from the balance cone hole (31), and the diameter of the mounting hole (33) is larger than the diameter of the cylindrical hole (32).
8. The large slenderness ratio force measurement test model structure according to claim 1, characterized in that: The body section (2) and the transition column section (3) are connected via a positioning pin.
9. The large slenderness ratio force measurement test model structure according to claim 1, characterized in that: The transition column section (3) is connected to the measuring balance (23) via a connecting assembly, which comprises a balance tightening screw (21), a gasket (26) and a balance taper sleeve (22). The balance taper sleeve (22) is sleeved on the outer side of the end of the measuring balance (23), and the balance taper sleeve (22) is inserted into the balance taper hole (31). After the balance tightening screw (21) passes through the gasket (26), the balance tightening screw (21) extends into the balance taper hole (31) and is threadedly connected to the measuring balance (23).