CN112525476B

CN112525476B - Model supporting and coupling rolling driving device for unsteady force measurement wind tunnel test

Info

Publication number: CN112525476B
Application number: CN202011428124.1A
Authority: CN
Inventors: 李玉平; 杨海泳; 赵忠良; 李�浩; 马上; 王晓冰; 陈建中
Original assignee: High Speed Aerodynamics Research Institute of China Aerodynamics Research and Development Center
Current assignee: High Speed Aerodynamics Research Institute of China Aerodynamics Research and Development Center
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2022-04-15
Anticipated expiration: 2040-12-07
Also published as: CN112525476A

Abstract

The invention discloses a model supporting and coupling rolling driving device for an unsteady force measurement wind tunnel test. The device is of a T-shaped rod type structure and comprises a tail support rod which is horizontally arranged, a mandrel is arranged on the central axis of the tail support rod, the front end of the mandrel extends out of the tail support rod and is fixedly connected with a balance, and a model is fixedly connected on the balance; the rear end of the mandrel extends out of the tail support rod, a vertical rolling driving servo motor is fixed above the rear end of the mandrel, vertical torque compensation servo motors are symmetrically fixed below the rear end of the mandrel, the rolling driving servo motors drive the mandrel to drive the balance and the model to perform rolling motion, and the torque compensation servo motors output same-direction rolling torque to compensate energy loss of the rolling driving servo motors; the rear end of the mandrel wraps the rear section of the supporting rod, and the tail supporting rod is inserted into the rear section of the supporting rod and is fixedly connected with the rear section of the supporting rod. The device has better model adaptability and higher accuracy of the rolling driving angle.

Description

Model supporting and coupling rolling driving device for unsteady force measurement wind tunnel test

Technical Field

The invention belongs to the technical field of high-speed wind tunnel tests, and particularly relates to a model supporting and coupling rolling driving device for an unsteady force measuring wind tunnel test.

Background

The rolling freedom of a balance support rod in a traditional model supporting device for a high-speed wind tunnel force measurement test is in a locked state, and the free rolling motion of a test model cannot be realized, so that the balance cannot measure the unsteady aerodynamic force and moment of the model, and the model supporting device cannot simulate the aerodynamic force and moment dynamic hysteresis effect of an aircraft under the condition of maneuvering motion.

Although the free rolling test device commonly used in the dynamic high-speed wind tunnel test releases the rolling freedom degree of the model, the zero-damping working state of the free rolling test device cannot be realized due to the influence of self friction damping on moving parts such as a bearing in the free rolling test device, and the simulation authenticity of the free rolling motion of the model is influenced;

in addition, the forced rock test device commonly used in the dynamic high-speed wind tunnel test also has an imperfect place in function, and the length of the tail support rod available for the model is reduced because the driving motor is arranged in the tail support rod; meanwhile, the roll aerodynamic moment generated by the loaded model can also influence the accuracy of the angle output of the roll driving motor.

Currently, there is a need to develop a model supporting and coupled rolling driving device for unsteady force wind tunnel test.

Disclosure of Invention

The invention aims to solve the technical problem of providing a model supporting and coupling rolling driving device for an unsteady force measuring wind tunnel test.

The invention relates to a model supporting and coupling rolling driving device for an unsteady force measurement wind tunnel test, which is characterized in that the device is of a T-shaped rod type structure and comprises a tail support rod which is horizontally arranged, a central axis of the tail support rod is provided with a mandrel, the front end of the mandrel extends out of the tail support rod and is fixedly connected with a balance, and the balance is fixedly connected with a model; the rear end of the mandrel extends out of the tail support rod, a vertical rolling driving servo motor is fixed above the rear end of the mandrel, vertical torque compensation servo motors are symmetrically fixed below the rear end of the mandrel, the rolling driving servo motors drive the mandrel to drive the balance and the model to perform rolling motion, and the torque compensation servo motors output same-direction rolling torque to compensate energy loss of the rolling driving servo motors; the rear end of the mandrel wraps the rear section of the supporting rod, and the tail supporting rod is inserted into the rear section of the supporting rod and is fixedly connected with the rear section of the supporting rod.

Furthermore, the rolling driving servo motor is fixedly connected with a driving motor reducer through a rolling driving servo motor mounting screw, and the driving motor reducer is fixedly connected with an upper interface of the rear section of the support rod through a driving motor reducer mounting screw.

Furthermore, in the inner cavity of the rear section of the supporting rod, the rear end of the mandrel is fixedly connected with a signal slip ring through a coupling, and the signal slip ring is fixed on the tail end face of the rear section of the supporting rod through a locking screw.

Furthermore, the tail support rod is fixedly connected with the rear section of the support rod through a tail support rod mounting screw.

Furthermore, a group of steps from high to low is arranged at the rear section of the mandrel from front to back, and the step end face of each step is a positioning end face; the first positioning end face is a positioning end face I, the positioning end face I is a mandrel positioning end face, a shaft sleeve II is sleeved on the mandrel, the shaft sleeve II tightly pushes the mandrel positioning end face from back to front, a thrust bearing is sleeved on the shaft sleeve II, the thrust bearing is tightly pressed and fixed on the shaft sleeve II through a bearing inner compression ring, and the thrust bearing is tightly pressed and fixed on the end face of the inner cavity corresponding to the tail support rod through a bearing outer compression ring; the second positioning end face is a positioning end face II, the positioning end face II is a positioning end face of an encoder rotor fixing seat, an encoder rotor is fixed on the encoder rotor fixing seat, the encoder rotor fixing seat tightly abuts against the positioning end face II from back to front, an encoder stator is fixedly arranged on the encoder stator fixing seat through an encoder stator mounting screw, and the encoder stator fixing seat is tightly fixed on the end face of the inner cavity corresponding to the tail support rod from back to front; the third positioning end face is a positioning end face III, the positioning end face III is a positioning end face of a bevel gear I, the bevel gear I is sleeved on and positioned on the mandrel through a bevel gear positioning key I, the front end of the bevel gear I tightly supports the positioning end face III from back to front, the front end of the bevel gear I is positioned through a compression ring sleeved on the mandrel, a bevel gear II which is vertically installed and positioned through the bevel gear positioning key II is meshed with the bevel gear I above the mandrel, the bevel gear II is fixedly connected with the output end of the driving motor reducer through a bevel gear II tensioning screw, the bevel gear III which is symmetrical to the bevel gear II, vertically installed and positioned through the bevel gear positioning key III is meshed with the bevel gear I below the mandrel, and the bevel gear III is fixedly connected with the output end of the torque compensation motor reducer through a bevel gear III tensioning screw; the fourth positioning end face is a positioning end face IV, the positioning end face IV is a positioning end face of the deep groove ball bearing, the deep groove ball bearing is sleeved on the mandrel, the rear section of the supporting rod is sleeved on the deep groove ball bearing, the front end of the deep groove ball bearing tightly abuts against the positioning end face IV from back to front, and the rear end of the deep groove ball bearing is positioned through the bearing snap ring retaining ring.

Furthermore, a front section of the mandrel is in clearance fit with the tail support rod through a cylinder, a step is arranged in an inner cavity of the tail support rod, the end face of the step is the front end face of the tail support rod, two groups of needle roller bearings II and needle roller bearings I are sequentially sleeved on the front section of the mandrel from back to front in front of the front end face of the tail support rod, the needle roller bearings II and the needle roller bearings I are spaced through a shaft sleeve I, and the front end of the needle roller bearing I is positioned through a front check ring; and the rolling driving servo motor drives the mandrel to perform rolling motion in the tail supporting rod through the needle bearing II and the needle bearing I.

Further, the mandrel and the balance are integrally processed.

Furthermore, the torque compensation servo motor is fixedly connected with a torque compensation motor reducer through a torque compensation servo motor mounting screw, and the torque compensation motor reducer is fixedly connected with a lower interface of the rear section of the supporting rod through a torque compensation motor reducer mounting screw.

Furthermore, an adjusting gasket I is arranged between the bevel gear II and the driving motor reducer, and an adjusting gasket II is arranged between the bevel gear III and the torque compensation motor reducer.

The model supporting and coupling rolling driving device for the unsteady force measurement wind tunnel test is provided with the 90-degree conical gear set, so that the connection and transmission mode of the driving motor and the mandrel is changed, the available length of the tail support rod is effectively increased, and the adaptability of the rolling driving device to the size of a model is improved.

The model supporting and coupling rolling driving device for the unsteady force measurement wind tunnel test is provided with the torque compensation servo motor, so that the output deviation of the rolling driving servo motor caused by self mechanical damping and model pneumatic damping is corrected, and the accuracy of the rolling driving angle of the rolling driving device is improved.

The model supporting and coupling rolling driving device for the unsteady force measurement wind tunnel test can ensure that a rolling driving servo motor in the rolling driving device rotates according to the instruction speed and continuously and stably moves according to the driving instruction when the self mechanical damping is influenced by the aerodynamic force of the model to be unsteady and the rolling driving device bears the rolling moment in the environment of a complex flow field of the wind tunnel test, realizes the accurate simulation of the rocking and rolling movement attitude of the aircraft, and obtains the pitching/rolling coupling aerodynamic characteristics of the aircraft in a typical flight state.

Drawings

FIG. 1 is a schematic structural diagram of a model supporting and coupled rolling driving device for unsteady force wind tunnel test according to the present invention;

FIG. 2 is an enlarged view of a portion I of FIG. 1;

fig. 3 is a partial enlarged view of ii of fig. 1.

In the figure, 1, a rolling drive servo motor 2, a drive motor reducer 3, a support rod rear section 4, a tail support rod 5, a mandrel 6, a torque compensation motor reducer 7, a torque compensation servo motor 8, a rolling drive servo motor mounting screw 9, a drive motor reducer mounting screw 10, a torque compensation motor reducer mounting screw 11, a torque compensation servo motor mounting screw 12, a signal slip ring 13, a coupling 14, a locking screw 15, a deep groove ball bearing 16, a bearing snap ring retainer ring 17, a bevel gear II 18, a bevel gear III 19, a bevel gear positioning key II 20, a bevel gear I21, a bevel gear positioning key III 22, a pressure ring 23, an encoder stator mounting screw 24, an encoder stator 25, an encoder stator fixing seat 26, an encoder rotor 27, an encoder rotor fixing seat 28, a tail support rod mounting screw 29, an outer pressure ring bearing thrust ring 30, an inner pressure ring shaft 31, a pressure ring shaft inner shaft 22, a pressure ring 23 and a pressure ring 23 are arranged in the same direction The bearing 32, the shaft sleeve II 33, the needle bearing II 34, the shaft sleeve I35, the needle bearing I36, the front retainer ring 37, the balance 38, the front end surface 39 of the tail support rod, the shaft positioning end surface 40, the bevel gear positioning key I41, the adjusting gasket I42, the adjusting gasket II 43, the bevel gear III tensioning screw 44 and the bevel gear II tensioning screw.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in fig. 1, the model supporting and coupling rolling driving device for unsteady force measurement wind tunnel test of the present invention is a T-shaped rod structure, and comprises a tail support rod 4 horizontally placed, a mandrel 5 is installed on the central axis of the tail support rod 4, the front end of the mandrel 5 extends out of the tail support rod 4 and is fixedly connected with a balance 37, and the balance 37 is fixedly connected with a model; the rear end of the mandrel 5 extends out of the tail support rod 4, a vertical rolling driving servo motor 1 is fixed above the rear end of the mandrel 5, vertical torque compensation servo motors 7 are symmetrically fixed below the rear end of the mandrel 5, the rolling driving servo motor 1 drives the mandrel 5 to drive the balance 37 and the model to perform rolling motion, the torque compensation servo motor 7 outputs the same-direction rolling torque, and the energy loss of the rolling driving servo motor 1 is compensated; the rear end of the mandrel 5 is wrapped on the rear section 3 of the supporting rod, and the tail supporting rod 4 is inserted into the rear section 3 of the supporting rod and is fixedly connected with the rear section 3 of the supporting rod.

Furthermore, the rolling driving servo motor 1 is fixedly connected with the driving motor reducer 2 through a rolling driving servo motor mounting screw 8, and the driving motor reducer 2 is fixedly connected with an upper interface of the support rod rear section 3 through a driving motor reducer mounting screw 9.

Furthermore, in the inner cavity of the post rear section 3, the rear end of the mandrel 5 is fixedly connected with a signal slip ring 12 through a coupling 13, and the signal slip ring 12 is fixed on the tail end face of the post rear section 3 through a locking screw 14.

Furthermore, the tail support rod 4 is fixedly connected with the support rod rear section 3 through a tail support rod mounting screw 28.

Further, as shown in fig. 2, a group of steps from high to low is arranged from front to back on the rear section of the mandrel 5, and the step end face of each step is a positioning end face; the first positioning end face is a positioning end face I, the positioning end face I is a mandrel positioning end face 39, a mandrel 5 is sleeved with a shaft sleeve II 32, the shaft sleeve II 32 tightly props against the mandrel positioning end face 39 from back to front, a thrust bearing 31 is sleeved on the shaft sleeve II 32, the thrust bearing 31 is tightly pressed and fixed on the shaft sleeve II 32 through a bearing inner pressing ring 30, and the thrust bearing 31 is tightly pressed and fixed on the end face of an inner cavity corresponding to the tail support rod 4 through a bearing outer pressing ring 29; the second positioning end face is a positioning end face II, the positioning end face II is a positioning end face of an encoder rotor fixing seat 27, an encoder rotor 26 is fixed on the encoder rotor fixing seat 27, the encoder rotor fixing seat 27 tightly supports the positioning end face II from back to front, an encoder stator 24 is fixedly arranged on an encoder stator fixing seat 25 through an encoder stator mounting screw 23, and the encoder stator fixing seat 25 is tightly fixed on the end face of the inner cavity corresponding to the tail support rod 4 from back to front; the third positioning end face is a positioning end face III, the positioning end face III is a positioning end face of a bevel gear I20, the bevel gear I20 is sleeved and positioned on the mandrel 5 through a bevel gear positioning key I40, the front end of the bevel gear I20 tightly pushes the positioning end face III from back to front, the front end of the bevel gear I20 is positioned through a pressing ring 22 sleeved on the mandrel 5, a bevel gear II 17 which is vertically arranged above the mandrel 5 and is positioned by a bevel gear positioning key II 19 is meshed with a bevel gear I20, the bevel gear II 17 is fixedly connected with the output end of the driving motor speed reducer 2 by a bevel gear II tensioning screw 44, below the mandrel 5, a bevel gear III 18 which is symmetrical and vertically arranged with a bevel gear II 17 and is positioned by a bevel gear positioning key III 21 is meshed with a bevel gear I20, and the bevel gear III 18 is fixedly connected with the output end of the torque compensation motor reducer 6 by a bevel gear III tensioning screw 43; the fourth positioning end face is a positioning end face IV, the positioning end face IV is a positioning end face of the deep groove ball bearing 15, the deep groove ball bearing 15 is sleeved on the mandrel 5, the rear section 3 of the supporting rod is sleeved on the deep groove ball bearing 15, the front end of the deep groove ball bearing 15 tightly pushes the positioning end face IV from back to front, and the rear end of the deep groove ball bearing 15 is positioned through a bearing snap ring retaining ring 16.

Further, as shown in fig. 3, a front section of the mandrel 5 is in clearance fit with the tail support rod 4 through a cylinder, a step is arranged in an inner cavity of the tail support rod 4, the end face of the step is a front end face 38 of the tail support rod, two groups of needle bearings ii 33 and i 35 are sequentially sleeved on the front section of the mandrel 5 from back to front, the needle bearings ii 33 and the i 35 are separated by a shaft sleeve i 34, and the front end of the i 35 is positioned by a front retainer ring 36; the needle bearing II 33, the needle bearing I35 and the front section of the mandrel 5 are in clearance fit, the tail support rod 4, the needle bearing II 33 and the needle bearing I35 are in clearance fit, and the rolling driving servo motor 1 drives the mandrel 5 to perform rolling movement in the tail support rod 4 through the needle bearing II 33 and the needle bearing I35.

Further, the mandrel 5 and the balance 37 are integrally processed.

Further, the torque compensation servo motor 7 is fixedly connected with a torque compensation motor reducer 6 through a torque compensation servo motor mounting screw 11, and the torque compensation motor reducer 6 is fixedly connected with a lower interface of the supporting rod rear section 3 through a torque compensation motor reducer mounting screw 10.

Furthermore, an adjusting shim I41 is arranged between the bevel gear II 17 and the driving motor reducer 2, and an adjusting shim II 42 is arranged between the bevel gear III 18 and the torque compensation motor reducer 6.

Example 1

The installation process of this embodiment is as follows:

the front retainer 36 penetrates from the small-diameter end, namely the rear end, of the mandrel 5 until the front retainer contacts with the rear end face of the balance 37, the needle bearing I35, the shaft sleeve I34 and the needle bearing II 33 are sequentially installed in the same installation mode, the front retainer 36, the needle bearing I35, the shaft sleeve I34 and the needle bearing II 33 are in clearance fit with the mandrel 5, and the flexible rotation of the parts is guaranteed. The rear end of the mandrel 5 penetrates through the small-diameter end, namely the front end, of the tail support rod 4 until the needle bearing II 33 is contacted with the front end 38 of the tail support rod 4.

Circle and II 32 excircle cylinders transition fit of axle sleeve in the thrust bearing 31, the boss rear end face of end face and II 32 of axle sleeve is laminated mutually before thrust bearing 31, II 32 of axle sleeve penetrate until laminating with 5 terminal surfaces 39 of dabber from 5 ends of dabber, II 32 of axle sleeve and 5 cylinder clearance fits of dabber, thrust bearing 31 and 4 interior cylinder clearance fits of tail branch pole this moment, bearing inner pressure ring 30 adopts the cylinder screw thread with dabber 5 to link to each other, through bearing inner pressure ring 30 locking thrust bearing 31, the axial position of II 32 of axle sleeve on dabber 5. The bearing outer pressure ring 29 is connected with the tail support rod 4 in a cylindrical threaded connection mode, and the axial position of the thrust bearing 31 on the tail support rod 4 is locked by screwing the bearing outer pressure ring 29 in a threaded mode. After the bearing outer compression ring 29 and the bearing inner compression ring 30 are screwed, the axial and radial relative positions of the mandrel 5, the tail support rod 4, the thrust bearing 31 and the shaft sleeve II 32 are all locked, and meanwhile, the needle bearing II 33, the needle bearing I35 and the shaft sleeve I34 are axially limited to move in a small range, so that the rotation flexibility of the needle bearing is ensured.

Encoder rotor fixing base 27 adopts the threaded connection form with dabber 5, and it is continuous with encoder rotor fixing base 27 adoption end face flange connection form, with dabber 5 contactless after the installation of encoder rotor 26, encoder stator fixing base 25 together with encoder stator 24 adopts the flange connection form terminal surface to link to each other with tail branch 4 through 4 encoder stator mounting screws 23 in the lump, and encoder stator 24 and encoder stator fixing base 25 do not contact with encoder rotor 26. In order to ensure that the

encoders

24 and 26 can accurately measure the rotation angle of the mandrel 5, the encoder stator 24, the encoder rotor 26 and the mandrel 5 need to be installed with good coaxiality.

Bevel gear I20 and 5 cylindrical clearance fit of dabber, the location of the roll-over between bevel gear I20 and the dabber 5 is realized through bevel gear navigation key I40, and axial positioning is realized through clamping ring 22, and clamping ring 22 adopts the cylindrical screw thread form with dabber 5 to link to each other. The inner ring of the deep groove ball bearing 15 is connected with the mandrel 5 in a clearance fit mode, and the axial positioning between the deep groove ball bearing 15 and the mandrel 5 is realized through a positioning boss of the mandrel 5 and a bearing clamp spring retainer ring 16. The post-section 3 of the strut is penetrated through the tail end of the mandrel 5, is in clearance fit with the outer ring of the deep groove ball bearing 15, is in clearance fit with the tail strut 4 in a cylindrical manner, and is fixedly connected with the tail strut through 4 tail strut mounting screws 28.

The motor shaft of the rolling servo driving motor 1 is connected with the rear shaft hole cylinder of the driving motor reducer 2 in a clearance fit mode, the radial positioning between the motor shaft and the driving motor reducer 2 is achieved through the positioning boss at the front end of the motor 1 and the positioning concave hole at the rear end of the driving motor reducer 2, and the axial positioning is achieved through a motor key. The driving motor reducer 2 and the supporting rod rear section 3 are in flange connection, the driving motor reducer 2 is attached to the end face of the supporting rod rear section 3, the driving motor reducer is fixed through 4 driving motor reducer mounting screws 9, and the driving motor reducer and the supporting rod rear section are radially positioned in a boss mode. The bevel gear II 17 is installed on the front shaft of the speed reducer 2 of the rolling driving motor, the bevel gear II 17 and the front shaft of the speed reducer 2 of the rolling driving motor are connected in a cylindrical clearance fit mode, the positioning in the rolling direction is carried out through a bevel gear positioning key II 19, the bevel gear II 17 is axially positioned through a bevel gear II tensioning screw 44 and installed on the front shaft of the speed reducer 2 of the driving motor, the clearance between the bevel gear II 17 and the bevel gear I20 is realized through an adjusting gasket I41, the axial relative position between the bevel gear II 17 and the speed reducer 2 of the driving motor can be changed by changing the thickness of the adjusting gasket I41, and therefore the gap size of the bevel gear is changed.

The motor shaft of the torque compensation servo motor 7 is connected with the rear shaft hole cylinder of the torque compensation motor reducer 6 in a clearance fit mode, the radial positioning between the motor shaft and the torque compensation motor reducer 6 is achieved through the positioning boss at the front end of the motor 7 and the positioning concave hole at the rear end of the torque compensation motor reducer 6, and the axial positioning is achieved through a motor key. The torque compensation motor reducer 6 and the supporting rod rear section 3 are in flange connection, the torque compensation motor reducer 6 is attached to the end face of the supporting rod rear section 3, the torque compensation motor reducer is fixed through 4 torque compensation motor reducer mounting screws 10, and the torque compensation motor reducer is radially positioned in a boss mode. The bevel gear III 18 is arranged on the front shaft of the torque compensation motor reducer 6 and connected in a cylindrical clearance fit mode, the bevel gear III 18 is located in the rolling direction through a bevel gear locating key III 21, the bevel gear III 18 is axially located through a bevel gear III tightening screw 43 and is arranged on the front shaft of the torque compensation motor reducer 6, the clearance between the bevel gear III 18 and the bevel gear I20 is achieved through an adjusting gasket II 42, the axial relative position between the bevel gear III 18 and the torque compensation motor reducer 6 can be changed by changing the thickness of the adjusting gasket II 42, and therefore the gap size of the bevel gear is changed.

The signal slip ring 12 is connected with the coupling 13 in a cylindrical transition fit mode, the other end of the coupling 13 is connected with the mandrel 5 in a meshing mode, the signal slip ring 12 is fixed on the rear section 3 of the supporting rod through a locking screw 14, an output signal line of the rolling encoder stator 24 is connected with one end of the signal slip ring 12, and a line at the other end of the signal slip ring 12 is output to an external measurement design for data acquisition.

The working process of the embodiment is as follows:

during wind tunnel test, the rolling servo driving motor 1 rotates according to a control instruction after being electrified, the rotating motion is transmitted to the bevel gear II 17 after being decelerated by the driving motor reducer 2, the bevel gear I20 drives the mandrel 5 to roll and move after being converted in the motion direction of the 90-degree bevel gear set, and finally the rotating motion is transmitted to a test model through a balance 37 at the front end of the mandrel 5 to generate the rolling instruction motion. The front-end balance 37 converts the measured rolling torque into a torque driving instruction of the torque compensation servo motor 7 through data processing, the torque compensation servo motor 7 drives the torque compensation motor reducer 6 to output driving torque with the same magnitude according to the compensation instruction, the bevel gear III 18 transmits the rolling driving torque to the bevel gear I20, and finally the rolling torque compensation function of the mandrel 5, the balance 37 and the test model is achieved.

Although embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples, but rather, to one skilled in the art, all features of the invention disclosed, or all steps of any method or process so disclosed, may be combined in any suitable manner, except for mutually exclusive features and/or steps, without departing from the principles of the invention. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.

Claims

1. The model supporting and coupling rolling driving device for the unsteady force-measuring wind tunnel test is characterized in that the device is of a T-shaped rod type structure and comprises a tail support rod (4) which is horizontally arranged, a mandrel (5) is installed on the central axis of the tail support rod (4), the front end of the mandrel (5) extends out of the tail support rod (4) and is fixedly connected with a balance (37), and a model is fixedly connected on the balance (37); the rear end of the mandrel (5) extends out of the tail support rod (4), a vertical rolling driving servo motor (1) is fixed above the rear end of the mandrel (5), vertical torque compensation servo motors (7) are symmetrically fixed below the rear end of the mandrel (5), the mandrel (5) is driven by the rolling driving servo motor (1) to drive the balance (37) and the model to perform rolling motion, the torque compensation servo motor (7) outputs the same-direction rolling torque, and the energy loss of the rolling driving servo motor (1) is compensated; the rear end of the mandrel (5) is wrapped on the rear section (3) of the supporting rod, and the tail supporting rod (4) is inserted into the rear section (3) of the supporting rod and is fixedly connected with the rear section (3) of the supporting rod;

the rear section of the mandrel (5) is provided with a group of steps from high to low from front to back, and the step end face of each step is a positioning end face; the first positioning end face is a positioning end face I, the positioning end face I is a mandrel positioning end face (39), a mandrel (5) is sleeved with a shaft sleeve II (32), the shaft sleeve II (32) tightly pushes the mandrel positioning end face (39) from back to front, the shaft sleeve II (32) is sleeved with a thrust bearing (31), the thrust bearing (31) is tightly pressed and fixed on the shaft sleeve II (32) through a bearing inner pressing ring (30), and the thrust bearing (31) is tightly pressed and fixed on the end face of an inner cavity corresponding to the tail support rod (4) through a bearing outer pressing ring (29); the second positioning end face is a positioning end face II, the positioning end face II is a positioning end face of an encoder rotor fixing seat (27), an encoder rotor (26) is fixed on the encoder rotor fixing seat (27), the encoder rotor fixing seat (27) tightly pushes the positioning end face II from back to front, an encoder stator (24) is fixedly installed on the encoder stator fixing seat (25) through an encoder stator installing screw (23), and the encoder stator fixing seat (25) is tightly fixed on the end face of the inner cavity corresponding to the tail support rod (4) from back to front; the third positioning end face is a positioning end face III, the positioning end face III is a positioning end face of a bevel gear I (20), the bevel gear I (20) is sleeved on and positioned on the mandrel (5) through a bevel gear positioning key I (40), the front end of the bevel gear I (20) is tightly jacked from back to front to position the positioning end face III, the front end of the bevel gear I (20) is positioned through a pressing ring (22) sleeved on the mandrel (5), a bevel gear II (17) which is vertically installed and positioned through a bevel gear positioning key II (19) is meshed with the bevel gear I (20) above the mandrel (5), the bevel gear II (17) is fixedly connected with the output end of the driving motor reducer (2) through a bevel gear II tensioning screw (44), the bevel gear III (18) which is symmetrical to the bevel gear II (17) and vertically installed below the mandrel (5) and positioned through the bevel gear positioning key III (21) is meshed with the bevel gear I (20), the bevel gear III (18) is fixedly connected with the output end of the torque compensation motor reducer (6) through a bevel gear III tensioning screw (43); the fourth positioning end face is a positioning end face IV, the positioning end face IV is a positioning end face of the deep groove ball bearing (15), the deep groove ball bearing (15) is sleeved on the mandrel (5), the supporting rod rear section (3) is sleeved on the deep groove ball bearing (15), the front end of the deep groove ball bearing (15) tightly abuts against the positioning end face IV from back to front, and the rear end of the deep groove ball bearing (15) is positioned through a bearing snap spring retaining ring (16).

2. The model supporting and coupling rolling driving device for the unsteady force measuring wind tunnel test according to claim 1, wherein the rolling driving servo motor (1) is fixedly connected with the driving motor reducer (2) through a rolling driving servo motor mounting screw (8), and the driving motor reducer (2) is fixedly connected with an upper interface of the supporting rod rear section (3) through a driving motor reducer mounting screw (9).

3. The model supporting and coupling rolling driving device for the unsteady force measuring wind tunnel test as claimed in claim 1, wherein in the inner cavity of the post rear section (3) of the strut, the rear end of the mandrel (5) is fixedly connected with a signal slip ring (12) through a coupling (13), and the signal slip ring (12) is fixed on the tail end face of the post rear section (3) of the strut through a locking screw (14).

4. The model supporting and coupling rolling driving device for unsteady force measuring wind tunnel test according to claim 1 is characterized in that the tail support rod (4) is fixedly connected with the support rod rear section (3) through a tail support rod mounting screw (28).

5. The model supporting and coupling rolling driving device for the unsteady force measuring wind tunnel test according to claim 1, wherein a front section of the mandrel (5) is in cylindrical clearance fit with the tail support rod (4), a step is arranged in an inner cavity of the tail support rod (4), the end surface of the step is a front end surface (38) of the tail support rod, two groups of needle bearings II (33) and needle bearings I (35) are sequentially sleeved on the front section of the mandrel (5) from back to front in front of the front end surface (38) of the tail support rod, the needle bearings II (33) and the needle bearings I (35) are separated by a shaft sleeve I (34), and the front end of the needle bearing I (35) is positioned by a front check ring (36); the needle bearing II (33), the needle bearing I (35) and the front section of the mandrel (5) are in clearance fit, the tail support rod (4), the needle bearing II (33) and the needle bearing I (35) are in clearance fit, and the rolling driving servo motor (1) drives the mandrel (5) to perform rolling motion in the tail support rod (4) through the needle bearing II (33) and the needle bearing I (35).

6. The model supporting and coupled rolling driving device for unsteady force wind tunnel test as claimed in claim 1, wherein said mandrel (5) and balance (37) are integrally formed.

7. The model supporting and coupling roll driving device for the unsteady force measuring wind tunnel test according to claim 1, wherein the torque compensation servo motor (7) is fixedly connected with the torque compensation motor reducer (6) through a torque compensation servo motor mounting screw (11), and the torque compensation motor reducer (6) is fixedly connected with a lower interface of the supporting rod rear section (3) through a torque compensation motor reducer mounting screw (10).

8. The model supporting and coupling rolling driving device for the unsteady force measuring wind tunnel test according to claim 1, wherein an adjusting shim I (41) is installed between the bevel gear II (17) and the driving motor reducer (2), and an adjusting shim II (42) is installed between the bevel gear III (18) and the torque compensation motor reducer (6).