A three-freedom vacation support mechanism

Abstract

A three-degree-of-freedom dummy support mechanism belongs to the technical field of aviation aerodynamic wind tunnel testing. The present invention includes a pitch transmission mechanism, a roll transmission mechanism, a mounting seat, and a longitudinal and transverse adapter frame. The pitch transmission mechanism and the roll transmission mechanism are connected via the longitudinal and transverse adapter frames, and a mounting seat is provided on the rear side of the roll transmission mechanism. The research and development purpose of the present invention is to solve the problem of real-time adjustment of the position of the dummy support, avoid interference between the dummy support and the model, and solve the problem of inaccurate balance measurement. The transmission mechanism of the present invention can realize three-degree-of-freedom adjustment, thereby improving the efficiency of the support interference correction test; and for different main supports, the dummy support shape is replaceable, and is suitable for a variety of support interference correction tests. This mechanism integrates long-term experience and lessons in the development and use of test equipment, and finally develops a three-degree-of-freedom adjustable dummy support mechanism suitable for a variety of support interference correction tests.

Description

Technical Field

[0001] The invention relates to a pseudo support mechanism with three degrees of freedom, belonging to the technical field of aviation aerodynamic wind tunnel testing. Background Art

[0002] During wind tunnel testing, the presence of the support system distorts the model's flow field, generating support interference. Support interference in conventional wind tunnel testing is divided into "far-field interference" and "near-field interference." Far-field interference refers to the effects of deviations in the flow field within the wind tunnel test section and the presence of central supports on the flow field within the test section. Near-field interference refers to the presence of the model's support system and the resulting disruption to the model's turbulent flow caused by localized distortion of the model's shape due to the supports. The effects of near-field interference are often mitigated through experimental correction.

[0003] The main test correction method is a two-step approach. First, basic aerodynamic data is obtained using the main support, and then interference from the main support is deducted using auxiliary and combined supports. When combining supports, while the auxiliary supports support the model, dummy supports are used to simulate the original main support shape. In this case, the force measurement of the balance does not include the aerodynamic force of the dummy supports. However, due to the weak stiffness of the auxiliary supports themselves or the high test angle of attack, the dummy supports easily interfere with the model, resulting in inaccurate force measurements on the balance.

[0004] Therefore, it is urgent to propose a three-freedom dummy support mechanism for wind tunnel testing, which can adjust the position of the dummy support in real time, avoid interference between the dummy support and the model, and solve the problem of inaccurate balance measurement. Summary of the Invention

[0005] The present invention is developed to provide a method for adjusting the position of dummy supports in real time, thereby preventing interference between the dummy supports and the model and resolving the issue of inaccurate balance measurements. A brief overview of the present invention is provided below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify key or important aspects of the present invention, nor is it intended to limit the scope of the present invention.

[0006] The technical solution of the present invention:

[0007] A three-freedom holiday support mechanism is provided, through which the model is connected to the auxiliary bracket, and includes a pitch transmission mechanism, a roll transmission mechanism, a mounting seat, and a longitudinal and transverse adapter frame. The pitch transmission mechanism and the roll transmission mechanism are connected through the longitudinal and transverse adapter frame, and a mounting seat is provided on the rear side of the roll transmission mechanism.

[0008] In order to solve the problem that the device can perform pitching motion, the present invention proposes the following technical solutions:

[0009] Preferably: the pitch transmission mechanism includes a pitch main transmission member, a pitch rotation axis, a pitch mounting frame, a pitch transmission shaft, a linear guide rail, an electric cylinder and a false tail support housing connecting member, the output end of the electric cylinder is equipped with a pitch transmission shaft, one end of the pitch transmission shaft is slidingly connected to the rear side of the pitch main transmission member, and the other end of the pitch transmission shaft is slidingly connected to the linear guide rail, the front side of the pitch main transmission member and the pitch mounting frame are hinged through the pitch rotation axis, and the front end of the pitch main transmission member is provided with a false tail support housing connecting member.

[0010] Preferably, a pitch rotation axis bearing is sleeved on the outer side of the pitch rotation axis, and a pitch transmission axis bearing is sleeved on the outer side of the pitch transmission axis.

[0011] In order to solve the problem that the device can perform circular rotation, the present invention proposes the following technical solutions:

[0012] Preferably: the rolling transmission mechanism includes a rolling transmission shaft, a rolling transmission bearing, a rolling bearing sleeve, a reducer, and a motor. The outer wall of the rolling transmission shaft establishes a rotational connection with the rolling bearing sleeve through the rolling transmission bearing, and the output end of the motor establishes a connection with the rolling transmission shaft through the reducer.

[0013] In order to solve the problem of achieving different heights of the entire mechanism relative to the mounting base, the present invention proposes the following technical solutions:

[0014] Preferably, limit blocks are provided on both the upper and lower sides of the mounting seat.

[0015] The present invention has the following beneficial effects:

[0016] 1. The three-degree-of-freedom artificial support mechanism of the present invention can realize the adjustment of the three degrees of freedom of the artificial support, thereby improving the efficiency of the support interference correction test;

[0017] 2. The three-freedom false support mechanism of the present invention can replace different false support shells according to different main supports, and is suitable for different support interference correction tests;

[0018] 3. The three-freedom dummy support mechanism of the present invention has a pitch axis that is relatively far from the model area, and a ±2° adjustment range that can effectively solve the problem of longitudinal interference between the dummy support and the model;

[0019] 4. The three-freedom dummy support mechanism of the present invention has a roll transmission mechanism that can achieve an adjustment range of ±180°. Combined with pitch adjustment, it can effectively solve the problem of lateral interference between the dummy support and the model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-freedom holiday support mechanism in use state one diagram;

[0021] Figure 2It is a three-freedom holiday support mechanism in use state two diagram;

[0022] Figure 3 It is a structural diagram of a three-freedom holiday support mechanism;

[0023] Figure 4 Schematic diagram of the pitch transmission mechanism of the present invention;

[0024] Figure 5 Schematic diagram of the structure of the rolling transmission mechanism of the present invention;

[0025] Figure 6 2. It is a comparative schematic diagram of the vertical and horizontal adapter frame corresponding to two usage states of the present invention;

[0026] In the figure, 0-1-model, 0-2-auxiliary bracket, 1-pitch transmission mechanism, 2-roll transmission mechanism, 3-mounting seat, 4-longitudinal and transverse adapter frame, 5-pitch main transmission component, 6-pitch rotation axis, 7-pitch rotation axis bearing, 8-pitch mounting frame, 9-pitch transmission shaft, 10-pitch transmission shaft bearing, 11-linear guide, 12-electric cylinder, 13-fake tail support housing connector, 14-roll transmission shaft, 15-roll transmission bearing, 16-roll bearing jacket, 17-reducer, 18-motor. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0028] The connections mentioned in the present invention are divided into fixed connections and detachable connections. The fixed connection refers to a non-detachable connection, including but not limited to conventional fixed connection methods such as hem connection, rivet connection, adhesive connection, and welding connection. The detachable connection refers to but not limited to conventional detachable connection methods such as threaded connection, snap connection, pin connection, and hinge connection. When the specific connection method is not clearly specified, it is assumed that at least one connection method can always be found among the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example, a welded connection is selected for a fixed connection, and a hinge connection is selected for a detachable connection.

[0029] Specific implementation method 1: Combination Figures 1-6 This embodiment describes a three-freedom holiday support mechanism of this embodiment, such as Figure 1 and 2As shown, model O-1 is connected to auxiliary support O-2 via a three-freedom swivel support mechanism, comprising a pitch transmission mechanism 1, a roll transmission mechanism 2, a mounting base 3, and a longitudinal and transverse adapter 4. Pitch transmission mechanism 1 and roll transmission mechanism 2 are connected via longitudinal and transverse adapter 4, with mounting base 3 located behind roll transmission mechanism 2. Pitch transmission mechanism 1 drives model O-1 to achieve pitch motion, while roll transmission mechanism 2 drives model O-1 to achieve rotation.

[0030] The pitch transmission mechanism 1 includes a pitch main transmission member 5, a pitch rotation axis 6, a pitch mounting frame 8, a pitch transmission shaft 9, a linear guide 11, an electric cylinder 12 and a false tail support housing connector 13. The output end of the electric cylinder 12 is equipped with a pitch transmission shaft 9. One end of the pitch transmission shaft 9 is slidably connected to the rear side of the pitch main transmission member 5, and the other end of the pitch transmission shaft 9 is slidably connected to the linear guide 11. The front side of the pitch main transmission member 5 and the pitch mounting frame 8 are hinged through the pitch rotation axis 6. The front end of the pitch main transmission member 5 is provided with a false tail support housing connector 13. The electric cylinder 12 pushes the pitch transmission shaft 9, driving the pitch main transmission member 5 to convert the linear displacement into an angle. The false tail support housing connector 13 can be connected to different model 0-1 outer shells. The installation of the linear guide 11 improves the rigidity of the pitch transmission mechanism 1. The pitch rotation axis 6 is far away from the model area, and the ±2° adjustment range can effectively solve the longitudinal interference problem between the false support and the model.

[0031] A pitch rotation axis bearing 7 is sleeved on the outer side of the pitch rotation axis 6 , and a pitch transmission axis bearing 10 is sleeved on the outer side of the pitch transmission axis 9 .

[0032] The roll transmission mechanism 2 comprises a roll transmission shaft 14, a roll transmission bearing 15, a roll bearing housing 16, a speed reducer 17, and a motor 18. The outer wall of the roll transmission shaft 14 is rotationally connected to the roll bearing housing 16 via the roll transmission bearing 15, and the output end of the motor 18 is connected to the roll transmission shaft 14 via the speed reducer 17. The speed reducer 17 at the output end of the motor 18 drives the transmission shaft 14 to achieve real-time adjustment of the mechanism's roll degree of freedom within a ±180° range. Combined with pitch adjustment, this effectively resolves lateral interference between the false supports and the model.

[0033] Limit blocks are provided on both the upper and lower sides of the mounting base 3. By adding limit blocks of different heights between the mounting base 3 and the mounting base, the entire mechanism can be placed at different heights relative to the mounting base.

[0034] The vertical and horizontal adapter frame 4 has a pitch angle, and different vertical and horizontal adapter frames 4 and false support outer shells are replaced, such as Figure 6 As shown, the relative position change of the pitch transmission mechanism and the roll transmission mechanism can be achieved, which is suitable for different support interference correction tests.

[0035] The working principle is:

[0036] The pitch transmission mechanism 1 is mounted at the output of the roll transmission mechanism 2. An electric cylinder 12 pushes the pitch transmission shaft 9, driving the pitch main transmission member 5 to convert linear displacement into angle. The installation of linear guides 11 increases the rigidity of the transmission mechanism. The pitch transmission mechanism 1 can achieve a real-time adjustment range of ±2°.

[0037] The roll transmission mechanism 14 is mounted on the mounting base 3 , and the motor 18 drives the roll transmission shaft 14 to achieve real-time adjustment of the roll freedom of the mechanism, with an adjustable range of ±180°.

[0038] By adding limit blocks of different heights between the mounting seat 3 and the mounting base, the entire mechanism can be placed at different heights relative to the mounting base.

[0039] 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0040] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments 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 drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0041] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0042] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0043] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0044] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be permuted and combined. Those skilled in the art can exhaust all possibilities based on the mathematical knowledge of permutations and combinations. Therefore, the present invention will no longer describe the technical solutions after permutations and combinations one by one, but it should be understood that the technical solutions after permutations and combinations have been disclosed by the present invention.

[0045] The foregoing description is merely a preferred embodiment of the present invention and is 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 are intended to be within the scope of protection of the present invention.

Claims

1. A three-freedom holiday support mechanism, wherein the model (0-1) is connected to the auxiliary support (0-2) via the three-freedom holiday support mechanism, characterized in that: The invention comprises a pitch transmission mechanism (1), a roll transmission mechanism (2), a mounting seat (3) and a longitudinal and transverse transfer frame (4), wherein the pitch transmission mechanism (1) and the roll transmission mechanism (2) are connected via the longitudinal and transverse transfer frame (4), and a mounting seat (3) is provided on the rear side of the roll transmission mechanism (2); The pitch transmission mechanism (1) comprises a pitch main transmission member (5), a pitch rotation shaft (6), a pitch mounting frame (8), a pitch transmission shaft (9), a linear guide rail (11), an electric cylinder (12) and a false tail support housing connecting member (13); the output end of the electric cylinder (12) is provided with a pitch transmission shaft (9); one end of the pitch transmission shaft (9) is slidably connected to the rear side of the pitch main transmission member (5); the other end of the pitch transmission shaft (9) is slidably connected to the linear guide rail (11); the front side of the pitch main transmission member (5) and the pitch mounting frame (8) are hinged via the pitch rotation shaft (6); and the front end of the pitch main transmission member (5) is provided with a false tail support housing connecting member (13); The pitch rotation shaft (6) is sheathed with a pitch rotation shaft bearing (7) on the outside, and the pitch transmission shaft (9) is sheathed with a pitch transmission shaft bearing (10) on the outside; The rolling transmission mechanism (2) comprises a rolling transmission shaft (14), a rolling transmission bearing (15), a rolling bearing outer sleeve (16), a speed reducer (17), and a motor (18); the outer wall of the rolling transmission shaft (14) is connected to the rolling bearing outer sleeve (16) through the rolling transmission bearing (15); the output end of the motor (18) is connected to the rolling transmission shaft (14) through the speed reducer (17); the speed reducer (17) at the output end of the motor (18) drives the rolling transmission shaft (14) to achieve real-time adjustment of the rolling freedom of the mechanism within a range of ±180°; The longitudinal and transverse adapter frames (4) have pitch angles, and by replacing different longitudinal and transverse adapter frames (4) and the false support outer shell, the relative position of the pitch transmission mechanism and the roll transmission mechanism (2) can be changed; The pitch transmission mechanism (1) is installed at the output end of the roll transmission mechanism (2), and the electric cylinder (12) pushes the pitch transmission shaft (9), driving the pitch main transmission member (5) to convert the linear displacement into an angle, so that the pitch transmission mechanism (1) achieves a real-time adjustment range of ±2°; The roll transmission mechanism (2) is mounted on the mounting base (3), and the motor (18) drives the roll transmission shaft (14) to achieve real-time adjustment of the roll freedom of the mechanism, with an adjustable range of ±180°; Limiting blocks are provided on both the upper and lower sides of the mounting seat (3).

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