In-shaft control five-degree-of-freedom anti-twisting device for coaxial double-rotor test bench

Abstract

The invention provides an in-shaft control five-degree-of-freedom anti-twisting device for a coaxial dual-rotor test bed. The device comprises an upper rotor control shaft, an upper rotor control shaft hollow pipe, an automatic inclinator moving ring, an automatic inclinator fixed ring, an actuator, an actuator support, a five-degree-of-freedom anti-twisting disc and a bearing support. Through the five-degree-of-freedom anti-twisting device, the motion of a non-rotating part in the in-shaft control system in the twisting direction is restrained in a limited space, meanwhile, other directions are free, and it is ensured that a control load cannot be transmitted to a test bed body through an anti-twisting mechanism; the invention provides an in-shaft control five-degree-of-freedom anti-twisting device for a coaxial dual-rotor test bed, which realizes the constraint of the motion in the twisting direction of an in-shaft control system, ensures that the control load is not transmitted to the test bed body through an anti-twisting mechanism, and ensures the accuracy and effectiveness of the measurement of the control load.

Description

Technical Field

[0001] The present application belongs to the technical field of rotor test bench control systems, and in particular relates to a five-degree-of-freedom anti-twist device for in-axis control of a coaxial twin-rotor test bench. Background Art

[0002] The rotor test bench needs to carry out full-scale functional tests and aerodynamic performance tests of the new rotor system. When conducting the above tests, it is necessary to change and manipulate the blade angle. The test bench design takes into account the impact of the hub space and the control system on the rotor force measurement. The upper rotor control system is bottom-mounted with a long control path. The inner ring of the upper rotor automatic tilt device is a dynamic ring, and the outer ring is a stationary ring. The outer ring is connected to the actuator and the actuator support and is fixed to the bearing support. When the inner ring and other rotating parts in the upper rotor control system rotate, they will be torsionally driven by friction and other forces, such as the actuator and the actuator support, and cause the control system in the coaxial twin rotor shaft to produce unstable shaking, affecting the normal operation of the control system. If conventional fixed anti-twist devices are used, the transmission and measurement of the control load will not be effective. Summary of the invention

[0003] Purpose of the invention: To provide a five-degree-of-freedom anti-torsion device for in-axis control of a coaxial twin-rotor test bench. The five-degree-of-freedom anti-torsion device constrains the horizontal torsional movement of non-rotating parts such as actuators and actuator supports in the in-axis control system of the coaxial twin-rotor test bench, thereby ensuring the stability and reliability of the non-rotating parts of the in-axis control system. In addition, due to the reasonable structural arrangement of the mechanism, the degrees of freedom in the remaining five directions are unconstrained, ensuring that the control load of the upper rotor system will not be transmitted to the platform body through the anti-torsion mechanism, but will be completely transmitted to the balance system for force measurement, thereby ensuring the accuracy of the control load measurement and meeting the needs of rotor load measurement.

[0004] The present application provides a coaxial twin-rotor test bench in-axis control five-degree-of-freedom anti-twist device, the device comprising: an upper rotor control shaft, an upper rotor control shaft hollow tube, an automatic tilter dynamic ring, an automatic tilter static ring, an actuator, an actuator support, a five-degree-of-freedom anti-twist plate, and a bearing support;

[0005] Among them, the five-degree-of-freedom anti-twist device constrains the torsional movement of the non-rotating parts in the in-axis control system within a limited space, while the remaining directions are free, ensuring that the control load will not be transmitted to the test bench through the anti-twist mechanism.

[0006] Preferably, the five-degree-of-freedom anti-twist disc is composed of an outer floating circular frame, a middle floating circular frame, an inner floating circular frame, a metal pin shaft, an elastic cylindrical pin, and a mounting support.

[0007] Preferably, the overall shape of the outer floating circular frame is a circular ring, symmetrically distributed along the vertical orthogonal axis, and the overall upper and lower surface parallelism needs to be controlled not to exceed 0.025, and the flatness is controlled not to exceed 0.01 to ensure the overall rotation and translation functions of the five-degree-of-freedom anti-twist disk are normal.

[0008] Preferably, the overall shape of the middle floating circular frame is a circular ring, symmetrically distributed along the vertical orthogonal axis, and the overall upper and lower surface parallelism needs to be controlled not to exceed 0.025, and the flatness is controlled not to exceed 0.01 to ensure the overall rotation and translation functions of the five-degree-of-freedom anti-twist disk are normal.

[0009] Preferably, the overall shape of the inner floating circular frame is a circular ring, symmetrically distributed along the vertical orthogonal axis, and the overall upper and lower surface parallelism needs to be controlled not to exceed 0.025, and the flatness is controlled not to exceed 0.01 to ensure the overall rotation and translation functions of the five-degree-of-freedom anti-twist disk are normal.

[0010] Preferably, the five-degree-of-freedom anti-twist disk is assembled as a whole structure, and the outer floating circular frame and the middle floating circular frame are connected by two longitudinal metal pins. The middle floating circular frame and the two longitudinal metal pins are interference fitted, and the two longitudinal metal pins are respectively at the normal through holes of the middle floating circular frame, and are fixed by elastic cylindrical pins at the ends. After assembly, the distance between the outer floating circular frame and the middle floating circular frame should be controlled to be no less than 10 mm to ensure that the structure has a certain amount of movement space and does not cause interference or jamming during normal work.

[0011] Preferably, the middle floating circular frame and the inner floating circular frame are connected by two horizontal metal pins. The inner floating circular frame and the two horizontal metal pins are interference fitted. The two horizontal metal pins are respectively located at the normal through holes of the inner floating circular frame and are fixed by elastic cylindrical pins at the ends. After assembly, the distance between the middle floating circular frame and the inner floating circular frame should be controlled to be no less than 10 mm to ensure that the structure has a certain amount of movement space and does not cause interference or jamming during normal work.

[0012] Preferably, the outer floating circular frame is connected to the mounting support by bolts and fixed to the test bench body;

[0013] After the five-degree-of-freedom anti-twist plate assembly is installed, the entire anti-twist plate can move and rotate flexibly in the directions of all degrees of freedom except the torsion direction without any jamming.

[0014] This application has the following technical effects:

[0015] The present application provides a five-degree-of-freedom anti-torsion mechanism for in-axis control of a coaxial twin-rotor test bench, which realizes the constraint of the torsional direction movement of the in-axis control system, while ensuring that the control load will not be transmitted to the test bench body through the anti-torsion mechanism, thereby ensuring the accuracy and effectiveness of the control load measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the five-degree-of-freedom anti-twist mechanism for in-axis manipulation;

[0017] Figure 2 It is a schematic diagram of a five-degree-of-freedom anti-torsion disk;

[0018] Figure 3 It is a schematic diagram of the outer floating circular frame;

[0019] Figure 4 It is a schematic diagram of the middle-level floating circular frame;

[0020] Figure 5 It is a schematic diagram of the inner floating circular frame;

[0021] Figure 6 It is a schematic diagram of the installation support;

[0022] Figure 7 It is a schematic diagram of the hollow tube of the upper rotor control shaft;

[0023] Figure 8 This is a schematic diagram of the upper rotor control axis. DETAILED DESCRIPTION

[0024] See also Figure 1-Figure 8 A coaxial twin-rotor test bench in-axis control five-degree-of-freedom anti-twist device is provided, comprising an upper rotor control shaft 1, an upper rotor control shaft hollow tube 2, an automatic tilting device moving ring 3, an automatic tilting device fixed ring 4, an actuator 5, an actuator support 6, a five-degree-of-freedom anti-twist plate 7, and a bearing support 8, such as Figure 1 shown.

[0025] The five-degree-of-freedom anti-twist plate 7 is composed of an outer floating circular frame 7.1, a middle floating circular frame 7.2, an inner floating circular frame 7.3, a metal pin shaft 7.4, an elastic cylindrical pin 7.5, and a mounting support 7.6. Figure 2 shown.

[0026] Among them, the outer floating circular frame 7.1 is as follows Figure 3As shown, the overall shape is a circular ring, symmetrically distributed along the vertical orthogonal axis, the overall upper and lower surface parallelism must be controlled not to exceed 0.025, and the flatness must be controlled not to exceed 0.01, so as to ensure the normal overall rotation and translation functions of the five-degree-of-freedom anti-twist disc 7. Square arms are arranged horizontally at the left and right ends in the horizontal plane, and the square arms are evenly distributed with through holes not less than M12, which are used to be installed and fixed with the rotor test bench body to prevent the five-degree-of-freedom anti-twist disc 7 from twisting in the horizontal direction, and finally transfer the torque load to the ground to achieve the anti-twist effect. Circular through holes are evenly distributed vertically along the axis at the upper and lower ends. The through holes need special treatment and are equipped with retaining ring grooves and bosses of appropriate sizes to achieve reasonable assembly and connection with the metal pin shaft 7.4. The thickness of the inner and outer rings shall not be less than one-tenth of the diameter of the inner ring to meet the overall stability requirements. The outer floating circular frame 7.1 is made of metal material as a whole, which needs to be tempered and artificially aged.

[0027] Among them, the middle floating round frame 7.2 Figure 4 As shown, the overall shape is in the shape of a ring, symmetrically distributed along the vertical orthogonal axis, the overall upper and lower surface parallelism must be controlled not to exceed 0.025, and the flatness must be controlled not to exceed 0.01, so as to ensure the normal overall rotation and translation functions of the five-degree-of-freedom anti-twist disc 7. Four bosses are evenly distributed on the symmetric axis, and the thickness of the bosses is not less than 1.5 times the thickness of the inner and outer rings. Through holes are arranged inside, and connected with the outer floating circular frame 7.1 through two metal pins 7.4, so that the outer floating circular frame 7.1 can freely translate in the horizontal plane along the vertical axis and freely rotate around the vertical axis, thereby achieving the effect of releasing two degrees of freedom in the horizontal plane, one up and down translation and one rotation. The transverse through hole is connected with the inner floating circular frame 7.3 through two metal pins 7.4, so that the inner floating circular frame 7.3 can freely translate in the horizontal plane along the transverse axis and freely rotate around the transverse axis, thereby achieving the effect of releasing two degrees of freedom in the horizontal plane, one left and right translation and one rotation. The four metal pins 7.4 can release the free translation and rotation of the five-degree-of-freedom anti-twist plate 7 in the horizontal plane, a total of four degrees of freedom. At the vertical through hole, two through holes are evenly distributed in the normal direction to fix the two metal pins 7.4 on the vertical axis. The thickness of the inner and outer rings is not less than one tenth of the diameter of the inner ring to meet the overall stability requirements. The middle floating round frame 7.2 is made of the same metal material as the outer floating round frame 7.1, and needs to be tempered and artificially aged.

[0028] Among them, the inner floating circular frame 7.3 is as follows Figure 5As shown, the overall shape is a ring shape, symmetrically distributed along the vertical orthogonal axis, the overall upper and lower surface parallelism must be controlled not to exceed 0.025, and the flatness must be controlled not to exceed 0.01, so as to ensure the normal overall rotation and translation functions of the five-degree-of-freedom anti-torsion disk 7. Two bosses are evenly distributed on the inner ring of the vertical axis, which cooperate with the guide groove of the bearing support 8 to constrain the torsional movement of the inner floating circular frame 7.3 in the horizontal plane, and at the same time, it can move up and down on the vertical plane along the guide groove to release the degree of freedom in this direction. Two bosses are evenly distributed on the outer ring of the transverse axis, and through holes are arranged inside, which are connected to the middle floating circular frame 7.2 through two metal pins 7.4. At the transverse through hole, two through holes are evenly distributed in the normal direction to fix the two metal pins 7.4 on the transverse axis, and the thickness of the inner and outer rings is not less than one-tenth of the diameter of the inner ring to meet the overall stability requirements. The middle floating circular frame 7.2 is made of the same metal material as the outer floating circular frame 7.1, and needs to be tempered and artificially aged.

[0029] Among them, the five-degree-of-freedom anti-twist disk 7 is assembled as an overall structure, the outer floating circular frame 7.1 and the middle floating circular frame 7.2 are connected by two longitudinal metal pins 7.4, the middle floating circular frame 7.2 and the two longitudinal metal pins 7.4 are interference fitted, the two longitudinal metal pins 7.4 are respectively at the normal through holes of the middle floating circular frame 7.2, and are fixed by elastic cylindrical pins 7.5 at the ends. After assembly, the distance between the outer floating circular frame 7.1 and the middle floating circular frame 7.2 should be controlled to be no less than 10 mm to ensure that the structure has a certain movement space and does not cause interference and jamming during normal work.

[0030] Among them, the middle floating circular frame 7.2 is connected to the inner floating circular frame 7.3 through two transverse metal pins 7.4. The inner floating circular frame 7.3 and the two transverse metal pins 7.4 are interference fit. The two transverse metal pins 7.4 are respectively fixed at the normal through holes of the inner floating circular frame 7.3 through the elastic cylindrical pins 7.5 at the ends. After assembly, the distance between the middle floating circular frame 7.2 and the inner floating circular frame 7.3 should be controlled to be no less than 10 mm to ensure that the structure has a certain movement space and does not cause interference and jamming during normal work. The outer floating circular frame 7.1 is connected to the mounting support 7.6 by bolts and fixed to the test bench body. After the five-degree-of-freedom anti-twist disc is assembled and installed, the entire anti-twist disc can move and rotate flexibly in all other degrees of freedom directions except the torsion direction without jamming.

[0031] How it works

[0032] During the coaxial twin-rotor test bench test, the control system drives the entire transmission chain to perform in-axis control through the actuator 5 → automatic tilting device fixed ring 4 → automatic tilting device dynamic ring 3 → upper rotor control shaft 1. When the upper rotor blades are driven to perform torque control movement, the actuator 5 will transfer the generated control load to the bearing support 8 through the non-rotating component actuator support 6, and then transfer it to the upper rotor control shaft hollow tube 2 through the bearing and finally to the balance force measurement system to measure all loads except torque. During the test, when the upper rotor control shaft 1 and the upper rotor control shaft hollow tube 2 and other rotating components rotate, the friction and other external forces will drive the non-rotating component actuator support 6 to move, so the movement of the non-rotating components of the entire control system must be constrained to make them fixed. At the same time, the control load cannot be transferred to the test bench body through methods such as fixed support constraints, otherwise it will cause measurement leakage of the balance force measurement system. Through the five-degree-of-freedom anti-twist plate 7, only the torsional movement of the bearing support 8 in the horizontal plane can be constrained. At the same time, the freedom of other lateral, translational, rolling, pitching and other directional movements in the horizontal plane is not constrained. The control load will not be transmitted to the platform body, causing measurement leakage of the control load, thereby ensuring the accuracy and effectiveness of the control load measurement.

[0033] The five-degree-of-freedom anti-twist device constrains the torsional movement of the non-rotating parts in the in-axis control system within a limited space, while the remaining directions are free, ensuring that the control load will not be transmitted to the test bench through the anti-twist mechanism, thereby ensuring the accuracy and effectiveness of the control load measurement.

[0034] The present application designs a five-degree-of-freedom anti-twist mechanism for in-axis control of a coaxial twin-rotor test bench, which realizes the constraint of the torsional direction movement of the in-axis control system, while ensuring that the control load will not be transmitted to the test bench body through the anti-twist mechanism, thereby ensuring the accuracy and effectiveness of the control load measurement.

Claims

1. A coaxial twin-rotor test bench in-axis control five-degree-of-freedom anti-twist device, characterized in that: The device comprises: an upper rotor control shaft, an upper rotor control shaft hollow tube, an automatic tilting device moving ring, an automatic tilting device fixed ring, an actuator, an actuator support, a five-degree-of-freedom anti-twist plate, and a bearing support; Among them, the five-degree-of-freedom anti-twist device constrains the torsional movement of the non-rotating parts in the in-axis control system within a limited space, while the remaining directions are free, ensuring that the control load will not be transmitted to the test bench through the anti-twist mechanism.

2. The device according to claim 1, characterized in that The five-degree-of-freedom anti-twist plate consists of an outer floating circular frame, a middle floating circular frame, an inner floating circular frame, a metal pin shaft, an elastic cylindrical pin and a mounting support.

3. The device according to claim 2, characterized in that The overall shape of the outer floating circular frame is a circular ring, which is symmetrically distributed along the vertical orthogonal axis. The overall upper and lower surface parallelism must be controlled not to exceed 0.025, and the flatness must be controlled not to exceed 0.01 to ensure the normal overall rotation and translation functions of the five-degree-of-freedom anti-twist disk.

4. The device according to claim 3, characterized in that The overall shape of the middle floating circular frame is a circular ring, which is symmetrically distributed along the vertical orthogonal axis. The overall upper and lower surface parallelism must be controlled not to exceed 0.025, and the flatness must be controlled not to exceed 0.01 to ensure the normal overall rotation and translation functions of the five-degree-of-freedom anti-twist disk.

5. The device according to claim 4, characterized in that The overall shape of the inner floating circular frame is a circular ring, which is symmetrically distributed along the vertical orthogonal axis. The overall upper and lower surface parallelism must be controlled not to exceed 0.025, and the flatness must be controlled not to exceed 0.01 to ensure the normal overall rotation and translation functions of the five-degree-of-freedom anti-twist disk.

6. The device according to claim 5, characterized in that The overall structure of the five-degree-of-freedom anti-twist disk is assembled, the outer floating circular frame and the middle floating circular frame are connected by two longitudinal metal pins, the middle floating circular frame and the two longitudinal metal pins are interference fitted, the two longitudinal metal pins are respectively at the normal through holes of the middle floating circular frame, and are fixed by elastic cylindrical pins at the ends. After assembly, the distance between the outer floating circular frame and the middle floating circular frame should be controlled to be no less than 10 mm to ensure that the structure has a certain amount of movement space and does not cause interference and jamming during normal work.

7. The device according to claim 6, characterized in that The middle floating circular frame and the inner floating circular frame are connected by two horizontal metal pins. The inner floating circular frame and the two horizontal metal pins are interference fitted. The two horizontal metal pins are respectively at the normal through holes of the inner floating circular frame and are fixed by elastic cylindrical pins at the ends. After assembly, the distance between the middle floating circular frame and the inner floating circular frame should be controlled to be no less than 10 mm to ensure that the structure has a certain movement space and no interference or jamming occurs during normal work.

8. The device according to claim 7, characterized in that The outer floating circular frame is connected to the mounting support by bolts and fixed to the test bench body; After the five-degree-of-freedom anti-twist plate assembly is installed, the entire anti-twist plate can move and rotate flexibly in the directions of all degrees of freedom except the torsion direction without any jamming.

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