CN114034463B

CN114034463B - Single-point abdominal support device of two-stage attack angle mechanism and control method

Info

Publication number: CN114034463B
Application number: CN202210019130.4A
Authority: CN
Inventors: 曹清媛; 赵昱; 田昊; 杨本川
Original assignee: Low Speed Aerodynamics Institute of China Aerodynamics Research and Development Center
Current assignee: Low Speed Aerodynamics Institute of China Aerodynamics Research and Development Center
Priority date: 2022-01-10
Filing date: 2022-01-10
Publication date: 2022-03-25
Anticipated expiration: 2042-01-10
Also published as: CN114034463A

Abstract

The invention discloses a single-point abdominal bracing device of a two-stage attack angle mechanism and a control method thereof, and the single-point abdominal bracing device comprises a base, a curved knife and a strut base, wherein two opposite outer side surfaces of the curved knife are respectively provided with a first guide rail, a rack and a second guide rail, the base is provided with a curved knife supporting seat, the curved knife supporting seat is provided with a first slider and a first gear, the strut base is provided with a second slider and a second gear, the second slider is connected to the second guide rail, the second gear is meshed with the rack, the first gear and the second gear are respectively meshed with the racks on different side surfaces of the curved knife, and the first gear and the second gear are respectively and independently connected with a driving motor. The invention adopts a two-stage attack angle mechanism to reach a large attack angle range of-30 degrees to 30 degrees, has small volume, is suitable for narrow and small installation space, adopts a dual-motor driven anti-backlash structure, compensates the problems of installation error, structural deformation, gear abrasion and the like, and realizes the effect of keeping anti-backlash for a long time.

Description

Single-point abdominal support device of two-stage attack angle mechanism and control method

Technical Field

The invention relates to the technical field of aerospace industry aerodynamic wind tunnel tests, in particular to a single-point abdominal support device of a two-stage attack angle mechanism and a control method.

Background

The common web bracing device for the wind tunnel test is divided into a single-strut web bracing device, a double-strut web bracing device, a multi-strut web bracing device and the like, and the bent knife mechanism is a bent knife-shaped single-point web bracing device and has the characteristics of basically same influence on airflow when the bent knife mechanism runs to any angle and good data repeatability.

The first mode is that the bent blade mechanism is arranged outside the wind tunnel, and the influence of the bent blade mechanism on the flow field of the wind tunnel is not considered, so that the bent blade mechanism has huge volume and can be adjusted within a larger attack angle range. Such as that described in patent publication CN 105157949A. The second type is in order to satisfy experimental needs setting in the wind-tunnel, and the vertical installation of curved knife mechanism is in the wind-tunnel, carries out the tail boom support to the model. The structural arrangement needs to meet the adjustment of a large attack angle range, occupies a very large space, has certain interference on a model, and cannot meet the test requirement. Such as the solutions described in patent publications CN110207939A or CN 113029498A.

Disclosure of Invention

The invention aims to design an attack angle mechanism adopting two-stage driving, which meets the application scenes of small occupied space and large attack angle range, eliminates motor interference in the two-stage driving process and improves the control precision.

In order to achieve the purpose, the invention adopts the following technical scheme:

a single-point abdominal bracing device of a two-stage attack angle mechanism, which comprises a base, a curved knife and a strut base,

a first guide rail, a rack and a second guide rail are respectively arranged on two opposite outer side surfaces of the curved knife,

the base is provided with a curved knife supporting seat, the curved knife supporting seat is provided with a first sliding block and a first gear, the first sliding block is connected to a first guide rail, the first gear is meshed with the rack,

a second sliding block and a second gear are arranged on the support rod base, the second sliding block is connected to a second guide rail, the second gear is meshed with the rack,

the first gear and the second gear are respectively meshed with racks on different side surfaces of the bent knife, the first gear is connected with a first driving motor, and the second gear is connected with a second driving motor.

In the above technical scheme, the curved knife supporting seat is of a U-shaped structure, wherein one U-shaped surface is only provided with the first sliding block, and the other opposite U-shaped surface is respectively provided with the first sliding block, the first driving motor and the first gear.

In the above technical scheme, the supporting rod base is of a U-shaped structure, one U-shaped surface is only provided with the second sliding block, and the other opposite U-shaped surface is respectively provided with the second sliding block, the second driving motor and the second gear.

In the technical scheme, the U-shaped surface of the support rod base, which is only provided with the second sliding block, and the U-shaped surface of the bent knife supporting seat, which is provided with the first sliding block, the first driving motor and the first gear, are connected to the same side surface of the bent knife together; the support rod base is provided with a second sliding block, a second driving motor, a second gear and a U-shaped surface of the bent knife supporting seat, wherein the U-shaped surface is only provided with the first sliding block, and the second sliding block, the second driving motor and the second gear are connected to the same side face of the bent knife.

In the technical scheme, the base is provided with two bent knife supporting seats for supporting the bent knives simultaneously, the supporting rod base is provided with two second gears connected with the bent knives, and the two first gears and the second gears are meshed with the racks simultaneously.

A control method of a single-point abdominal supporting device of a two-stage attack angle mechanism is characterized in that a first stage attack angle mechanism drives a second gear to drive a strut base to slide along a second guide rail on a bent knife through a second driving motor, so that the attack angle is adjusted within the range of [ -20 degrees, 20 degrees ],

the second-stage angle-of-attack mechanism drives the first gear to drive the bent knife to slide on the bent knife supporting seat along the direction of the first guide rail through the first driving motor, and the angle-of-attack is adjusted within the range of [ -10 degrees, 10 degrees ].

In the technical scheme, the first-stage attack angle mechanism and the second attack angle mechanism are synchronously driven by double motors.

In the technical scheme, when the double-motor synchronous driving is carried out, the transmission clearance between the gear and the rack is eliminated in the following mode:

when the same-stage angle of attack mechanism is driven, when the first driving motor provides driving force, the gear of the first driving motor is in contact with the first rack tooth surface, the second driving motor provides movement resistance smaller than the driving force, the gear of the second driving motor is in contact with the second rack tooth surface, and the first rack tooth surface and the second rack tooth surface are located in opposite directions of the rack.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

(1) the two-stage attack angle mechanism is adopted to reach a large attack angle range of-30 degrees to 30 degrees, the size is small, and the device is suitable for narrow installation space.

(2) The double-motor driven anti-backlash structure is adopted, and an electric anti-backlash method is adopted on the premise of ensuring the installation precision of the transmission part, so that the problems of installation errors, structural deformation, gear abrasion and the like are compensated, and the effect of keeping anti-backlash for a long time is realized.

(3) The mode that the guide rails are symmetrically distributed on the two sides of the base is adopted, the supporting rods move on the symmetrical surface of the abdominal bracing device, the movement is stable, and the generation of tilting moment due to single-side installation is avoided.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of a two-stage angle of attack mechanism of the present invention;

FIG. 2 is a schematic front view of the structure of FIG. 1;

FIG. 3 is a schematic view of a first-order angle of attack mechanism of the present invention;

FIG. 4 is a schematic front view of the structure of FIG. 3;

FIG. 5 is a schematic diagram of dual motor backlash;

wherein: 1 is a base, 2 is a curved knife, 3 is a curved knife supporting seat, 4 is a first driving motor, 5 is a first gear, 6 is a first sliding block, 7 is a supporting rod base, 8 is a second driving motor, 9 is a second sliding block, 10 is a second gear, 11 is a first guide rail, 12 is a rack, 13 is a second guide rail, 14 is a supporting rod, and 15 is a motor supporting seat.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

As shown in fig. 1, 2, 3, and 4, which are schematic structural diagrams of this embodiment, in this embodiment, the main structure is a curved knife 2, a base 1, and a strut base 7, the strut base 7 moves along the curved knife 2, and the curved knife 2 moves along the base 1, so that two-stage movement is realized, and a wide range of movement of an angle of attack is realized.

The bending knife 2 is of a symmetrical distribution structure, the side faces of two sides of the base are respectively provided with a first guide rail 11, a rack 12 and a second guide rail 13, the first guide rail 11, the rack 12 and the second guide rail 13 are sequentially arranged from outside to inside, the first guide rail 11 is used for being connected with the bending knife supporting seat 3, and the second guide rail 13 is used for being connected with the supporting rod base 7.

In this embodiment, as shown in fig. 1, for more stably supporting the bent blade 2, the bent blade support base 3 is designed to be a U-shaped structure, the bent blade 2 is disposed in a U-shaped groove of the bent blade support base 3, only the first slider 6 is disposed on a U-shaped surface of one of the bent blade support bases 3, the first slider 6 and the first driving motor 4 are respectively disposed on a U-shaped surface of the other bent blade support base 3, the first sliders 6 on two U-shaped surfaces of the bent blade support base 3 are respectively clamped on the first guide rails 11 on two side surfaces of the bent blade 2, and the first driving motor 4 drives the first gear 5 to be engaged with the rack 12.

In the present embodiment, as shown in fig. 3, the strut base 7 for supporting the strut is also designed as a U-shaped structure, the U-shaped structure is buckled on the curved knife structure 2 in a reverse manner, one U-shaped surface of the strut base 7 is connected with the second driving motor 8 and the second slider 9 through the motor support 15, only the second slider 9 is arranged on the other U-shaped surface of the strut base 7, when the strut base 7 is buckled on the curved knife 2, the second sliders on the two U-shaped surfaces are respectively buckled on the second guide rail 13, and the second gear 10 connected with the second driving motor 8 is meshed with the rack 12.

As shown in fig. 1 to 4, when the supporting rod base 7 and the curved blade supporting seat 3 are simultaneously fastened to the curved blade 2, the second driving motor 8 connected to the supporting rod base 7 and the first driving motor 4 connected to the curved blade supporting seat 3 are respectively connected to different sides of the curved blade 2, so that the first driving motor 4 and the second driving motor 8 do not interfere with each other during the movement process.

In this embodiment, two curved blade supporting seats 3 are provided on the base 1, and the first driving motors 4 on the two curved blade supporting seats 3 drive the curved blades 2 to move simultaneously. And two second driving motors 8 are also arranged on the supporting rod base 7 on the curved knife 2, and the supporting rod base 7 is driven to move by the two second driving motors 8.

In this embodiment, the main function of the mechanism is to drive the strut 14 to rotate to realize the change of the attack angle of the model. In the embodiment, the motion of the support rod base 7 on the curved knife 2 is regarded as a first-stage attack angle mechanism, so that the change range of the attack angle of the model supported by the support rod can be realized to be-20 degrees; the curved knife 2 moves on the curved knife supporting seat 3 to be regarded as a second-stage attack angle mechanism, the change range of the attack angle of the model supported by the supporting rod can be realized to be-10 degrees to 10 degrees, and the combined movement of the whole mechanism can reach the attack angle range of-30 degrees to 30 degrees.

In this embodiment, because first order angle of attack mechanism and second order angle of attack mechanism have all adopted two motor synchronous drive, consequently two motors drive the in-process of gear and rack meshing and must appear the transmission clearance, the existence of transmission clearance can lead to the precision of angle of attack to change, adopts following process for eliminating the transmission clearance:

as shown in fig. 5, in the same stage of the angle of attack mechanism, when one of the motors provides a driving force, a gear a mounted on the motor is in contact with a first rack tooth surface a; the other motor provides motion resistance smaller than the driving force to drive the gear B to contact with a second rack tooth surface B, and the first rack tooth surface a and the second rack tooth surface B are opposite to the rack. When the gears are reversed, the gear B is converted to provide driving force, the gear A provides movement resistance, but the contact surfaces of the two gears and the rack are unchanged, so that the contact surface conversion caused by the reverse direction is avoided, and the gear transmission clearance can be eliminated.

The two-stage attack angle mechanism of the embodiment is mainly applied to the closed wind tunnel section, and due to the adoption of the two-stage motion mechanism, when the same attack angle range point abdominal bracing design is realized for the traditional one-stage motion mechanism, the whole occupied space is very small, and the device is arranged in the wind tunnel relative to the volume of the traditional mechanism, so that the interference on a model is reduced.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.

Claims

1. The utility model provides a single-point abdominal bracing device of two-stage angle of attack mechanism, includes base, curved sword and branch base, its characterized in that:

the base is provided with a curved knife supporting seat which is of a U-shaped structure, one U-shaped surface is only provided with a first sliding block, the other opposite U-shaped surface is respectively provided with a first sliding block, a first driving motor and a first gear, the first sliding block is connected to a first guide rail, the first gear is meshed with the rack,

the support rod base is of a U-shaped structure, only a second sliding block is arranged on one U-shaped surface, the U-shaped surface which is provided with a first sliding block, a first driving motor and a first gear on the curved knife supporting seat is connected to the same side surface of the curved knife, a second sliding block, a second driving motor and a second gear are respectively arranged on the other opposite U-shaped surface on the support rod base, the U-shaped surface which is only provided with the first sliding block on the curved knife supporting seat is connected to the same side surface of the curved knife, the second sliding block is connected to a second guide rail, and the second gear is meshed with the rack,

2. The single point abdominal brace device of a two-stage angle of attack mechanism of claim 1, wherein:

the base is provided with two bent knife supporting seats for supporting the bent knives simultaneously, the supporting rod base is provided with two second gears connected with the bent knives, and the two first gears and the second gears are meshed with the racks simultaneously.

3. The single-point abdominal bracing device of the two-stage attack angle mechanism according to claim 1, characterized by comprising the following control method:

the first-stage attack angle mechanism drives a second gear to drive the support rod base to slide along a second guide rail on the bent knife through a second driving motor, so that the attack angle is adjusted within the range of [ -20 degrees, 20 degrees ],

4. The single point abdominal brace device of a two-stage angle of attack mechanism of claim 3, wherein: the first-stage angle-of-attack mechanism and the second angle-of-attack mechanism are both synchronously driven by double motors.

5. The single point abdominal brace device of a two-stage angle of attack mechanism of claim 4, wherein:

when the double-motor synchronous driving is carried out, the transmission clearance between the gear and the rack is eliminated in the following way: