Multi-degree-of-freedom supporting mechanism for high-speed wind tunnel

Abstract

The invention discloses a high-speed wind tunnel multi-degree-of-freedom supporting mechanism which comprises a main force bearing framework, a side sliding assembly rotating along a vertical axis is arranged on the main force bearing framework, an attack angle assembly rotating along a transverse horizontal axis is arranged on the side sliding assembly, and a rolling assembly rotating along a longitudinal horizontal axis is arranged on the attack angle assembly. And a model placement position is arranged on the rolling assembly. The invention has the following beneficial effects: a full-curved knife three-degree-of-freedom mechanism is adopted, free movement in three directions of attack angle, sideslip and rolling is realized, three postures required by a model can be continuously changed, full-curved knife arrangement is adopted, the rigidity of the whole supporting mechanism can be improved, the vertical symmetry of airflow is good, strong and weak current vertical wiring can be realized, and the reliability of the whole supporting mechanism is improved. And the influence of electromagnetic interference on high-precision measurement equipment data of sensors such as the balance is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of high-speed wind tunnels, and in particular relates to a multi-degree-of-freedom support mechanism for a high-speed wind tunnel. Background Art

[0002] A wind tunnel is a pipe-shaped experimental device that can artificially generate and control airflow to simulate the flow of gas around an aircraft or object, measure the effect of gas on the object, and observe physical phenomena. Wind tunnel tests usually fix the model or object in the wind tunnel and allow gas to flow through the model. This test method has the advantages of easy control of flow conditions, being basically unaffected by the external environment, convenient and accurate measurement, and repeatable and economical acquisition of experimental data. It is the most commonly used and effective experimental method for conducting aerodynamic experiments.

[0003] In large-scale high-speed wind tunnels, when aerodynamic tests are performed on models, the models are mounted on support structures to simulate various attitude angle changes of the models.

[0004] The existing model support mechanism is generally a dual-degree-of-freedom mechanism, namely the angle of attack and the rolling direction. The sideslip direction is generally coupled by a dual-axis mechanism. The sideslip angle needs to be decoupled from the angle of attack for calculation, and the sideslip angle replacement efficiency is low. There are also support mechanisms with a semi-scimitar eccentric load arrangement, which have weak overall structural rigidity, poor bearing capacity, and affect the symmetry and stability of the high-speed airflow flow field. Summary of the invention

[0005] The purpose of the present invention is to provide a high-speed wind tunnel multi-degree-of-freedom support mechanism, which improves the test efficiency and solves the problem that the existing model support mechanism has an eccentric load that affects the model and has poor flow field and bearing capacity.

[0006] The object of the present invention is achieved through the following technical solutions: A high-speed wind tunnel multi-degree-of-freedom support mechanism comprises a main load-bearing frame, on which is provided a side sliding assembly rotating along a vertical axis, on which is provided an angle of attack assembly rotating along a transverse horizontal axis, on which is provided an angle of attack assembly rotating along a longitudinal horizontal axis, and on which is provided a model placement position.

[0007] Furthermore, the rolling assembly includes a hollow motor and a rolling bracket. The hollow motor is arranged on the attack angle bracket. The hollow motor is connected to the rolling bracket. The rolling bracket is provided with a model placement position.

[0008] Furthermore, the angle of attack assembly includes an upper angle of attack blade, a middle angle of attack bracket and a lower angle of attack blade. The upper angle of attack blade is slidably arranged on the side sliding upper bracket, the lower angle of attack blade is slidably arranged on the side sliding lower bracket, and the middle angle of attack bracket is connected between the upper angle of attack blade and the lower angle of attack blade.

[0009] Furthermore, an attack angle cylinder is hinged between the side sliding upper bracket and the attack angle upper scimitar, the side sliding upper bracket is provided with a scimitar limiting slide that slides with both sides of the attack angle upper scimitar, and the side sliding upper bracket is provided with an attack angle locking component that locks with the attack angle upper scimitar.

[0010] Furthermore, upper scimitar sliders are provided on both sides of the upper scimitar at an attack angle, and the upper scimitar sliders are slidably matched with the upper scimitar guide rails on the side sliding upper bracket. Lower scimitar sliders are provided on both sides of the lower scimitar at an attack angle, and the lower scimitar sliders are slidably matched with the lower scimitar guide rails on the side sliding lower bracket.

[0011] Furthermore, the side-sliding assembly includes an upper side-sliding bracket, a lower side-sliding bracket and a side-sliding bearing seat. The upper side-sliding bracket is slidably arranged on the upper part of the main load-bearing frame, the lower side-sliding bracket is slidably arranged on the lower part of the main load-bearing frame, and the side-sliding bearing seat is arranged between the main load-bearing frame and the lower side-sliding bracket. The upper side-sliding bracket and the lower side-sliding bracket both rotate along the vertical axis where the side-sliding bearing seat is located.

[0012] Furthermore, an upper side-sliding oil cylinder is hingedly connected between the upper side-sliding bracket and the main load-bearing frame, and a lower side-sliding oil cylinder is hingedly connected between the lower side-sliding bracket and the main load-bearing frame.

[0013] Furthermore, the side-sliding upper bracket is connected to the side-sliding upper slide, the downward slider of the side-sliding upper bracket slides in sliding cooperation with the first upper guide rail and the second upper guide rail facing upward of the main load-bearing frame, and the downward slider of the main load-bearing frame slides in sliding cooperation with the third upper guide rail and the fourth upper guide rail facing upward of the side-sliding upper slide; the side-sliding lower bracket is connected to the side-sliding slide, the upward slider of the side-sliding lower bracket slides in sliding cooperation with the first lower guide rail facing downward of the main load-bearing frame, the downward slider of the side-sliding lower bracket slides in sliding cooperation with the fourth lower guide rail facing upward of the main load-bearing frame, and the second lower guide rail and the third lower guide rail facing downward of the side-sliding lower slide slide slides in sliding cooperation with the upward slider of the main load-bearing frame.

[0014] Beneficial effects of the present invention: (1) The full scimitar three-degree-of-freedom mechanism can continuously change the three postures required by the model, which are divided into free movements in three directions: angle of attack, sideslip, and roll.

[0015] (2) The full scimitar layout can improve the rigidity of the entire support mechanism and improve the upward and downward symmetry of the airflow.

[0016] (3) It can realize the separation of strong and weak electricity lines, reducing the impact of electromagnetic interference on the data of high-precision measurement equipment such as balance sensors.

[0017] The aforementioned main scheme of the present invention and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection by the present invention; and in the present invention, (non-conflicting options) options and other options can also be freely combined. After understanding the scheme of the present invention, those skilled in the art can understand that there are many combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present invention, and they are not exhaustively listed here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural stereogram of the present invention.

[0019] Figure 2 yes Figure 1 Enlarged view of A1.

[0020] Figure 3 yes Figure 1 Enlarged view of A2.

[0021] Figure 4 yes Figure 1 A3 of the enlarged view.

[0022] Figure 5 yes Figure 1 A4 enlarged view.

[0023] Figure 6 It is a structural stereogram (top view) of the present invention after removing the frame.

[0024] Figure 7 yes Figure 6 Enlarged view of B1.

[0025] Figure 8 yes Figure 6 Enlarged view of B2.

[0026] Fig. 9 yes Figure 6 Enlarged view of B3.

[0027] Fig.10 yes Figure 6 Enlarged view of B4.

[0028] Fig.11 It is a structural stereogram (looking up) of the present invention after the frame is removed.

[0029] Fig.12 yes Fig.11 Enlarged view of C1.

[0030] Fig.13 yes Fig.11 Enlarged view of C2.

[0031] Fig.14 yes Fig.11 Enlarged view of C3.

[0032] Fig.15 yes Fig.11 Enlarged view of C4.

[0033] Fig.16 It is a structural stereogram of the present invention after removing the frame and the side sliding bracket.

[0034] Fig.17 yes Fig.16 Enlarged view of D1.

[0035] Fig.18 yes Fig.16 Enlarged view of D2.

[0036] Fig.19 yes Fig.16 Enlarged view of D3.

[0037] Fig. 20 yes Fig.16 Enlarged view of D4.

[0038] In the figure: 1-main load-bearing frame, 2-side sliding assembly, 3-angle of attack assembly, 4-roll assembly; 211-side sliding upper bracket, 212-side sliding upper slide, 213-side sliding upper cylinder, 214-first upper guide rail, 215-second upper guide rail, 216-third upper guide rail, 217-fourth upper guide rail, 221-side sliding lower bracket, 222-side sliding slide, 223-side sliding lower cylinder, 224-first lower guide rail, 225-second lower Guide rail, 226-third lower guide rail, 227-fourth lower guide rail, 23-side sliding bearing seat; 311-upper scimitar of attack angle, 312-upper slider of scimitar, 313-upper guide rail of scimitar, 314-limiting slide seat of scimitar, 315-angle cylinder of attack angle, 316-angle locking assembly of attack angle, 321-middle bracket of attack angle, 331-lower scimitar of attack angle, 332-lower slider of scimitar, 333-lower guide rail of scimitar; 41-hollow motor, 42-rolling bracket. DETAILED DESCRIPTION

[0039] The following non-limiting examples serve to illustrate the invention.

[0040] Example 1 refer to Figure 1 to Figure 20 As shown, a high-speed wind tunnel multi-degree-of-freedom support mechanism includes a main load-bearing frame 1, a side sliding component 2, an angle of attack component 3 and a rolling component 4.

[0041] The main load-bearing skeleton 1 is a rectangular hollow frame structure, which is used to provide a foundation for installation or support of other structures. The main load-bearing skeleton 1 is provided with a side sliding component 2 that rotates along the vertical axis. The side sliding component 2 drives the angle of attack component 3, the rolling component 4 and the model to slide horizontally relative to the main load-bearing skeleton 1 to change the offset angle of the model. The side sliding component 2 is provided with an angle of attack component 3 that rotates along the transverse horizontal axis. The angle of attack component 3 drives the rolling component 4 and the model to slide relative to the side sliding component 2 to change the pitch angle of the model. The angle of attack component 3 is provided with a rolling component 4 that rotates along the longitudinal horizontal axis. The rolling component 4 is provided with a model placement position. The rolling component 4 drives the model to slide relative to the angle of attack component 3 to change the flipping angle of the model.

[0042] The angle of attack assembly 3 includes an upper angle of attack blade 311, a middle angle of attack bracket 321 and a lower angle of attack blade 331, and the middle angle of attack bracket 321 is connected between the upper angle of attack blade 311 and the lower angle of attack blade 331. The upper angle of attack blade 311 is slidably arranged on the side sliding upper bracket 211, and the lower angle of attack blade 331 is slidably arranged on the side sliding lower bracket 221. The upper and lower side sliding brackets realize the upper and lower symmetrical arrangement of the blade supports, thereby ensuring the symmetry and stability of the angle of attack.

[0043] The two sides of the upper scimitar 311 of the attack angle are provided with upper scimitar sliders 312, which are slidably matched with the upper scimitar guide rails 313 on the side sliding upper bracket 211, and the upper scimitar guide rails 313 are also located on both sides and are in an upper arc structure. The two sides of the lower scimitar 331 of the attack angle are provided with lower scimitar sliders 332, which are slidably matched with the lower scimitar guide rails 333 on the side sliding lower bracket 221, and the lower scimitar guide rails 333 are also located on both sides and are in a lower arc structure.

[0044] An angle-of-attack oil cylinder 315 is hinged between the side-sliding upper bracket 211 and the angle-of-attack upper curved blade 311. The angle-of-attack oil cylinder 315 provides the power for the angle of attack, and the angle-of-attack upper curved blade 311 drives the angle-of-attack middle bracket 321 and the angle-of-attack lower curved blade 331 to move relative to the upper and lower side-sliding brackets. The side-sliding upper bracket 211 is provided with a curved blade limiting slide 314 that is slidably matched with both sides of the angle-of-attack upper curved blade 311. The curved blade limiting slide 314 is located in the middle between the upper and lower parts, providing limiting support for the curved blade part in the middle without the guide rail function, thereby improving the stability of the curved blade angle of attack.

[0045] The side sliding upper bracket 211 is provided with an attack angle locking assembly 316 which is locked with the attack angle upper scimitar 311. The attack angle locking assembly 316 is preferably an oil cylinder, which drives the pin to be inserted into the corresponding sockets on the bracket and the scimitar. When the scimitar moves to a certain state, the position of the scimitar is locked.

[0046] The attack angle middle bracket 321 is used to install the rolling assembly 4. The rolling assembly 4 located in the middle of each assembly has good stability. The rolling assembly 4 includes a hollow motor 41 and a rolling bracket 42. The hollow motor 41 is arranged on the attack angle middle bracket 321. The hollow motor 41 is connected to the rolling bracket 42. The rolling bracket 42 is provided with a model placement position. The hollow motor 41 drives the rolling bracket 42 to rotate, and synchronously drives the model to roll.

[0047] The side sliding assembly 2 includes a side sliding upper bracket 211, a side sliding lower bracket 221 and a side sliding bearing seat 23. The side sliding upper bracket 211 is slidably arranged on the upper part of the main load-bearing frame 1, and the side sliding lower bracket 221 is slidably arranged on the lower part of the main load-bearing frame 1. The upper and lower side sliding brackets realize the upper and lower symmetrical arrangement of the side sliding support, thereby ensuring the symmetry and stability of the side sliding. The side sliding bearing seat 23 is arranged between the main load-bearing frame 1 and the side sliding lower bracket 221. The side sliding upper bracket 211 and the side sliding lower bracket 221 both rotate along the vertical axis where the side sliding bearing seat 23 is located, that is, the sliding movement of the upper and lower side sliding brackets is realized with the center of the side sliding bearing seat 23 as a reference.

[0048] An upper sliding cylinder 213 is hinged between the upper sliding bracket 211 and the main load-bearing frame 1, and a lower sliding cylinder 223 is hinged between the lower sliding bracket 221 and the main load-bearing frame 1. The upper and lower cylinders are used to independently drive the corresponding side sliding brackets to rotate, providing the power required for the rotational movement.

[0049] The side-sliding upper bracket 211 is connected to the side-sliding upper slide 212, and the slide further improves the stability of the sliding. The downward slider of the side-sliding upper bracket 211 slides with the first upper guide rail 214 and the second upper guide rail 215 of the main load-bearing frame 1. The first upper guide rail 214 is located at the front end and has an outer arc structure, and the second upper guide rail 215 is located at the middle front end and has an inner arc structure. The downward slider of the main load-bearing frame 1 slides with the third upper guide rail 216 and the fourth upper guide rail 217 of the side-sliding upper slide 212. The third upper guide rail 216 is located at the middle and rear end and has an inner arc structure, and the fourth upper guide rail 217 is located at the rear end and has an inner arc structure.

[0050] The side sliding lower bracket 221 is connected to the side sliding slide 222, and the sliding stability is further improved by the slide. The upward slider of the side sliding lower bracket 221 slides with the first lower guide rail 224 of the main load-bearing frame 1 downward, and the first lower guide rail 224 is located at the front end and has an inner arc structure. The downward slider of the side sliding lower bracket 221 slides with the fourth lower guide rail 227 of the main load-bearing frame 1 upward, and the fourth lower guide rail 227 is located at the rear end and has an inner arc structure. The second lower guide rail 225 and the third lower guide rail 226 of the side sliding lower slide 222 slide downward and the upward slider of the main load-bearing frame 1 slide, and the second lower guide rail 225 and the third lower guide rail 226 are located at the middle front end and the middle rear end respectively and are both inner arc structures.

[0051] A method for installing a high-speed wind tunnel multi-degree-of-freedom support mechanism comprises the following steps for the support mechanism.

[0052] First, install the side sliding bearing seat 23 on the main load-bearing frame 1, and then install the lower slider guide rail assembly on the main load-bearing frame 1, the side sliding lower bracket 221 and the side sliding lower slide 222. The lower slider guide rail assembly is centered with the side sliding bearing seat 23 to ensure that the lower slider guide rail assembly is concentric with the side sliding bearing seat 23. The four lower guide rails are adjusted to be concentric by dialing, and the four lower guide rails bear load at the same time.

[0053] Because of over-constraint, the installation requirements are high. The upper and lower side slides need to be concentric, and the center of the angle of attack assembly must be concentric with the side slide as much as possible to ensure smooth operation and stable data. Therefore, a mechanical concentric rod is then installed on the lower slider rail assembly to lead it to the upper part, and then the upper slider rail assembly is installed on the main load-bearing frame 1, the side slide upper bracket 211 and the side slide upper slide 212 based on the mechanical concentric rod to ensure that the upper and lower slider rail assemblies are concentric, wherein the first upper rail 214 and the second upper rail 215 are used to determine the rotation center and bear the force, and the third upper rail 216 and the fourth upper rail 217 are arranged at the rear end for bearing the force. Then install the corresponding oil cylinder and other components.

[0054] Then, an upper attack angle blade 311 is installed on the side sliding upper bracket 211, and an lower attack angle blade 331 is installed on the side sliding lower bracket 221. A rolling assembly 4 is installed on the middle attack angle bracket 321 between the upper attack angle blade 311 and the lower attack angle blade 331. The rolling assembly is a general rolling motion, and has the advantage of adopting a hollow motor reducer group, which is conducive to cable arrangement.

[0055] Since the angle of attack component adopts a full curved blade, the separation of strong and weak electricity is achieved in the full curved blade, and the strong and weak electricity are routed separately in upper and lower directions.

[0056] The above basic examples of the present invention and their further optional examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed for protection by the present invention. In the scheme of the present invention, each optional example can be arbitrarily combined with any other basic examples and optional examples.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-speed wind tunnel multi-degree-of-freedom support mechanism, comprising a main load-bearing frame (1), a side sliding assembly (2), an angle of attack assembly (3) and a rolling assembly (4), characterized in that: The main load-bearing frame (1) is provided with a side sliding component (2) that rotates along a vertical axis, the side sliding component (2) is provided with an angle of attack component (3) that rotates along a transverse horizontal axis, the angle of attack component (3) is provided with a rolling component (4) that rotates along a longitudinal horizontal axis, and the rolling component (4) is provided with a model placement position.

2. The high-speed wind tunnel multi-degree-of-freedom support mechanism according to claim 1, characterized in that: The rolling assembly (4) comprises a hollow motor (41) and a rolling bracket (42); the hollow motor (41) is arranged on the attack angle middle bracket (321); the hollow motor (41) is connected to the rolling bracket (42); and a model placement position is provided on the rolling bracket (42).

3. The high-speed wind tunnel multi-degree-of-freedom support mechanism according to claim 1, characterized in that: The angle of attack assembly (3) comprises an upper angle of attack blade (311), a middle angle of attack bracket (321) and a lower angle of attack blade (331); the upper angle of attack blade (311) is slidably mounted on the side-sliding upper bracket (211); the lower angle of attack blade (331) is slidably mounted on the side-sliding lower bracket (221); and the middle angle of attack bracket (321) is connected between the upper angle of attack blade (311) and the lower angle of attack blade (331).

4. The high-speed wind tunnel multi-degree-of-freedom support mechanism according to claim 3, characterized in that: An angle of attack oil cylinder (315) is hingedly connected between the side sliding upper bracket (211) and the angle of attack upper scimitar (311), a scimitar limiting slide seat (314) that slidably cooperates with both sides of the angle of attack upper scimitar (311) is provided on the side sliding upper bracket (211), and an angle of attack locking assembly (316) that locks with the angle of attack upper scimitar (311) is provided on the side sliding upper bracket (211).

5. The high-speed wind tunnel multi-degree-of-freedom support mechanism according to claim 3, characterized in that: Scimitar upper sliders (312) are provided on both sides of the attack angle upper scimitar (311), and the scimitar upper sliders (312) are slidably matched with scimitar upper guide rails (313) on the side sliding upper bracket (211); scimitar lower sliders (332) are provided on both sides of the attack angle lower scimitar (331), and the scimitar lower sliders (332) are slidably matched with scimitar lower guide rails (333) on the side sliding lower bracket (221).

6. The high-speed wind tunnel multi-degree-of-freedom support mechanism according to claim 1, characterized in that: The side sliding assembly (2) comprises a side sliding upper bracket (211), a side sliding lower bracket (221) and a side sliding bearing seat (23); the side sliding upper bracket (211) is slidably arranged on the upper part of the main load-bearing frame (1); the side sliding lower bracket (221) is slidably arranged on the lower part of the main load-bearing frame (1); the side sliding bearing seat (23) is arranged between the main load-bearing frame (1) and the side sliding lower bracket (221); and the side sliding upper bracket (211) and the side sliding lower bracket (221) both rotate along the vertical axis where the side sliding bearing seat (23) is located.

7. The high-speed wind tunnel multi-degree-of-freedom support mechanism according to claim 6, characterized in that: An upper side sliding oil cylinder (213) is hingedly connected between the upper side sliding bracket (211) and the main load-bearing frame (1), and a lower side sliding oil cylinder (223) is hingedly connected between the lower side sliding bracket (221) and the main load-bearing frame (1).

8. The high-speed wind tunnel multi-degree-of-freedom support mechanism according to claim 6, characterized in that: The side-sliding upper bracket (211) is connected to the side-sliding upper slide (212); the sliding block of the side-sliding upper bracket (211) is slidably matched with the first upper guide rail (214) and the second upper guide rail (215) of the main load-bearing frame (1) facing upward; the sliding block of the main load-bearing frame (1) is slidably matched with the third upper guide rail (216) and the fourth upper guide rail (217) of the side-sliding upper slide (212); the side-sliding lower bracket (221) is connected to the side-sliding lower slide (222); the sliding block of the side-sliding lower bracket (221) is slidably matched with the first lower guide rail (224) of the main load-bearing frame (1); the sliding block of the side-sliding lower bracket (221) is slidably matched with the fourth lower guide rail (227) of the main load-bearing frame (1); the second lower guide rail (225) and the third lower guide rail (226) of the side-sliding lower slide (222) are slidably matched with the sliding block of the main load-bearing frame (1) facing upward.

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