CN209961442U

CN209961442U - Novel wind-tunnel flow field calibration mechanism

Info

Publication number: CN209961442U
Application number: CN201920549936.8U
Authority: CN
Inventors: 姚裕; 李先影; 吴洪涛; 柯世堂; 陈彬; 易弢
Original assignee: Nanjing University of Aeronautics and Astronautics
Current assignee: Nanjing University of Aeronautics and Astronautics
Priority date: 2019-04-22
Filing date: 2019-04-22
Publication date: 2020-01-17
Anticipated expiration: 2029-04-22

Abstract

The utility model relates to a novel wind-tunnel flow field calibration mechanism, including multi freedom arm, base, guide rail, slider, probe, pressurized strut, radome fairing. The multi-degree-of-freedom mechanical arm is composed of a plurality of single mechanical arms, and the degrees of freedom of the multi-degree-of-freedom mechanical arms are controlled by motors respectively. The head end of the multi-degree-of-freedom mechanical arm is installed on a sliding block of the guide rail through a base, the tail end of the multi-degree-of-freedom mechanical arm is provided with a probe for measuring a flow field, and the peripheries of all the mechanical arms are provided with fairings. The guide rail is arranged on the wall of the wind tunnel test section and is vertically paved with the axis of the wind tunnel test section. The utility model discloses can realize that the probe freely removes in space three-dimensional coordinate system, have simple structure, the degree of freedom is many, degree of automation is high and to the characteristics that flow field interference is little, can wide application in wind-tunnel flow field test.

Description

Novel wind-tunnel flow field calibration mechanism

Technical Field

The utility model relates to an experiment aerodynamics field especially relates to a novel wind-tunnel flow field calibration mechanism and application method.

Background

The flow field calibration mechanism is used as a standard corollary device for a wind tunnel test and is mainly used for realizing the movement of the position of a probe so as to obtain the flow field parameters of each section position point of a test section, and the position precision of the flow field calibration mechanism is very important to the performance index of a wind tunnel flow field. The existing flow field calibration mechanism adopts a three-coordinate frame form, generally adopts a ball screw to perform automatic control in order to achieve higher measurement precision, but is only limited to small and medium wind tunnels, and an auxiliary supporting device is required to be additionally arranged on a large wind tunnel due to long stroke so as to improve rigidity. In the use process of the flow field calibration mechanism, the problems of low rigidity, low positioning precision, low automation degree, high blockage degree and the like generally exist.

Disclosure of Invention

The purpose of the invention is as follows: the utility model provides a wind-tunnel flow field calibration mechanism, this wind-tunnel flow field calibration mechanism have simple structure, rigidity height, positioning accuracy height, advantage that degree of automation is high.

The technical scheme is as follows: in order to achieve the purpose, the utility model discloses wind-tunnel flow field calibration mechanism adopts following technical scheme.

A novel wind tunnel flow field calibration mechanism comprises a guide rail, a slide block, a base, a multi-degree-of-freedom mechanical arm and a probe, wherein the slide block is positioned on the guide rail and slides along the guide rail;

the guide rail is arranged on the wall of the wind tunnel test section and is vertically paved with the axis of the wind tunnel test section;

the multi-degree-of-freedom mechanical arm at least comprises a first section of mechanical arm arranged on the base, a last section of mechanical arm connected with the first section of mechanical arm and a last section of mechanical arm hinged with the middle section of mechanical arm; the probe is installed at the tail end of the tail section mechanical arm.

Furthermore, the multi-degree-of-freedom mechanical arm further comprises at least one middle section of mechanical arm for connecting the first section of mechanical arm and the last section of mechanical arm; one end of the middle section mechanical arm is hinged with the first section mechanical arm, and the other end of the middle section mechanical arm is hinged with the last section mechanical arm.

Furthermore, an actuating cylinder is arranged on the tail section mechanical arm and is controlled by a motor to drive the tail section mechanical arm to do telescopic motion along the axis direction of the tail section mechanical arm.

Furthermore, the first section of mechanical arm, the middle section of mechanical arm and the last section of mechanical arm are all wrapped with fairings.

Furthermore, the first section of mechanical arm, the middle section of mechanical arm and the last section of mechanical arm are all controlled by the motor.

Has the advantages that: the utility model discloses can realize that the probe freely removes in space three-dimensional coordinate system, have simple structure, rigidity height, degree of freedom many, degree of automation height and to the characteristics that flow field interference is little, but wide application in wind-tunnel flow field test.

Drawings

Fig. 1 is a schematic structural view of a novel wind tunnel flow field calibration mechanism of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a schematic view of the assembly of the robot arm and the cowling according to the present invention;

fig. 4 is a three-dimensional schematic diagram of the present invention when used in a wind tunnel test section.

In the figure, 1, a multi-degree-of-freedom mechanical arm, 1-1, a first section of mechanical arm, 1-2, a middle section of mechanical arm, 1-3, a last section of mechanical arm, 2, a base, 3, a guide rail, 4, a slide block, 5, a probe, 6, an actuating cylinder, 7, a fairing, 8 and a wall of a wind tunnel test section hole are shown

Detailed Description

Referring to fig. 1-2, the present disclosure will be described with reference to the accompanying drawings, wherein the preferred embodiments are described for illustrating and explaining the present invention, and not for limiting the present invention.

As shown in fig. 1-4, the utility model discloses a novel wind-tunnel flow field calibration mechanism, including guide rail 3, be located guide rail 3 and along the gliding slider 4 of guide rail, install base 2 on slider 4, install multi freedom arm 1 on base 2, install and be equipped with probe 5 that is used for measuring the flow field at multi freedom arm 1 end. The guide rail 3 is installed on a tunnel wall 8 of the wind tunnel test section and is vertically paved with an axis of the wind tunnel test section. The multi-degree-of-freedom mechanical arm 1 comprises a first section of mechanical arm 1-1 installed on the base, a middle section of mechanical arm 1-2 hinged with the first section of mechanical arm 1-1, and a last section of mechanical arm 1-3 hinged with the middle section of mechanical arm 1-2. Each section of the multi-degree-of-freedom mechanical arm can rotate around a connecting shaft which is hinged with each other, and an actuating cylinder 6 is attached to the last section of the multi-degree-of-freedom mechanical arm 1-3, so that the last section of the multi-degree-of-freedom mechanical arm 1-3 can do telescopic motion along the axial direction of the last section of the multi-degree-of-freedom mechanical arm. The first section of mechanical arm 1-1, the middle section of mechanical arm 1-2, the last section of mechanical arm 1-3 and the actuating cylinder 6 are all controlled by motors.

In this embodiment, the guide rail is installed on the bottom wall of the wind tunnel test section, but in the field, the guide rail is installed on the upper wall or the side wall of the wind tunnel test section, which are replaceable structures, and will not be described herein again.

In this embodiment, the multi-degree-of-freedom mechanical arm has a structure of three sections of mechanical arms, but in this field, the multi-degree-of-freedom mechanical arm has a structure that two sections of mechanical arms (i.e., a first section of mechanical arm and a last section of mechanical arm) or more than three sections of mechanical arms (i.e., a middle section of mechanical arm having multiple sections) are replaceable structures, and details are not repeated here.

The first section of mechanical arm 1-1, the middle section of mechanical arm 1-2 and the last section of mechanical arm 1-3 are all wrapped with fairings 7 so as to reduce the interference of the mechanical arms on a flow field.

As shown in fig. 4, the using method of the novel wind tunnel flow field calibration mechanism comprises the following steps:

when the wind tunnel flow field is measured, the angle of each mechanical arm needing to be rotated and the length of the actuating cylinder needing to be adjusted are solved by the control module of the multi-degree-of-freedom mechanical arm, then a control instruction is sent to each motor, each single mechanical arm is located at an expected position, and finally the probe is located at a target measuring point, so that the measurement of the flow field is realized.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel wind-tunnel flow field calibration mechanism is characterized in that: the device comprises a guide rail, a slide block, a base, a multi-degree-of-freedom mechanical arm and a probe, wherein the slide block is positioned on the guide rail and slides along the guide rail;

the multi-degree-of-freedom mechanical arm at least comprises a first section of mechanical arm arranged on the base, a last section of mechanical arm connected with the first section of mechanical arm or a last section of mechanical arm hinged with the middle section of mechanical arm; the probe is installed at the tail end of the tail section mechanical arm.

2. The novel wind tunnel flow field calibration mechanism of claim 1, wherein: the multi-degree-of-freedom mechanical arm further comprises at least one middle section mechanical arm for connecting the first section mechanical arm and the last section mechanical arm; one end of the middle section mechanical arm is hinged with the first section mechanical arm, and the other end of the middle section mechanical arm is hinged with the last section mechanical arm.

3. A novel wind tunnel flow field calibration mechanism according to claim 1 or 2, characterized in that: the tail section mechanical arm is provided with an actuating cylinder, and the actuating cylinder is controlled by a motor to drive the tail section mechanical arm to do telescopic motion along the axis direction of the tail section mechanical arm.

4. The novel wind tunnel flow field calibration mechanism of claim 2, wherein: the first section of mechanical arm, the middle section of mechanical arm and the last section of mechanical arm are all wrapped with fairings.

5. The novel wind tunnel flow field calibration mechanism of claim 4, wherein: the first section of mechanical arm, the middle section of mechanical arm and the last section of mechanical arm are all controlled by the motor.