Rotary motion driving device for aircraft control surface dynamics experiment

Abstract

The invention discloses a rotary motion driving device for an aircraft control surface dynamics experiment, which belongs to the field of aircraft structure dynamics experiments and consists of a rotary driving part and a frequency modulation and amplitude modulation part. According to the rotation driving part, a sliding block reciprocates along a sliding rail, a driving spring plate is driven to swing left and right, a fork lug connected to the driving spring plate stirs a rotation driving sleeve, and a shaft drives a control surface to rotate around the shaft clockwise and anticlockwise. The reciprocating motion of the sliding block is driven by the frequency modulation motor through the eccentric wheel, so that the sliding block reciprocates on the sliding rail. The frequency of the rotation motion is adjusted through a frequency modulation motor. A lifting platform is arranged in order to adjust the amplitude of rotary motion, the height of an eccentric wheel and the height of a sliding rail are changed through lifting of the platform, a sliding block reciprocates at different heights of a driving spring plate, the amplitude of a fork lug is changed, and then the deflection angle of a control surface is changed.

Description

Technical Field

[0001] The invention belongs to the field of aircraft structure dynamics test, and in particular relates to a rotary motion driving device used for aircraft control surface dynamics test. Background Art

[0002] Aircraft usually have many control surfaces to maintain flight stability and control flight maneuvers. Control surfaces are crucial to flight control. Most control surfaces rotate around an axis. To ensure flight safety, a large number of tests and verifications are often required for each link of the aircraft control surface structure and control system. Control surface dynamics tests include dynamic response tests, buffeting tests, and flutter tests. During the test, it is usually necessary to simulate different vibration environments, and it is necessary to simulate the changes in vibration frequency and vibration amplitude at the same time. Sometimes the vibration amplitude will expand rapidly in a short period of time. When conducting control surface dynamics tests on aircraft, certain dynamic devices are required to simulate the rotation of the control surfaces.

[0003] Currently, there are few devices that simulate the rotational motion environment of control surfaces, which limits the relevant test content. For some typical tests such as flutter and buffeting tests, parametric test research is very inconvenient. Summary of the invention

[0004] The invention discloses a device capable of driving the rotational motion of an aircraft control surface, which is used to simulate the rotational vibration environment in the process of the aircraft control surface dynamics experiment. The device of the invention can simulate the vibration of the control surface at different frequencies and amplitudes by driving the control surface to rotate around an axis.

[0005] The present invention is achieved in that:

[0006] A rotary motion driving device for aircraft control surface dynamics experiments, the device comprising a rotary driving sleeve, the outer surface of the rotary driving sleeve is a cylindrical surface, the inner surface of the rotary driving sleeve is a hexagonal prism surface, the outer surface of the rotary driving sleeve is connected to two horizontal first connecting rods and a vertical driving rod; the hexagonal prism surface is connected to the control surface rotating shaft, and the axes of the two coincide.

[0007] Furthermore, two first connecting rods in the horizontal direction are fixedly connected to the left and right sides of the rotating drive sleeve, are in the same straight line as the diameter of the rotating drive sleeve, and are respectively connected to the restoring springs; the driving rod is fixedly connected to the bottom of the sleeve, is perpendicular to the axis of the sleeve, and the end of the driving rod is provided with a cross bar parallel to the axis of the sleeve, the cross bar is perpendicular to the driving rod, and is placed in the groove of the fork ear. The cross bar is driven by the fork ear to move around the rotating shaft, and the cross bar slides in the fork ear; the rotating drive sleeve is connected to the rudder surface rotating shaft to control the frequency and amplitude of the rotating shaft deflection.

[0008] Furthermore, one end of the restoring spring is fixed, and the other end of the restoring spring is connected to the first connecting rod of the rotating drive sleeve, so as to overcome the system gap and provide a restoring torque; the length and diameter of the first connecting rod depend on the inertia of the rudder surface and the stiffness of the restoring spring, so as to ensure that the first connecting rod does not produce excessive bending and does not resonate within the frequency range of the test; the two first connecting rods are fixedly connected to the left and right sides of the rotating drive sleeve, are in the same straight line with the diameter of the sleeve, and are respectively connected to the restoring springs.

[0009] Furthermore, the bottom of the fork ear is connected to the top of the driving spring plate, the fork ear opening is upward, and the driving rod and the cross bar are placed inside the opening; the fork ear drives the driving rod to deflect the rotating driving sleeve;

[0010] The fork ear notch is arranged on the ear plate of the fork ear, the fork ear notch is located in the middle of the ear plate, the height of the fork ear notch is 2 / 3 of the depth of the fork ear groove, and the width of the fork ear notch is larger than the diameter of the driving rod, so that the fork ear and the driving rod do not interfere with each other during the rotation process.

[0011] Furthermore, the driving spring plate is a slender strip metal plate with appropriate rigidity, the normal direction of the plate surface is perpendicular to the axial direction of the rudder surface shaft, the length direction is perpendicular to the axial direction of the shaft, the bottom end is fixed, and the top end is connected to the bottom of the fork ear; two cylindrical rods are installed on the top of the slider to clamp the driving spring plate; given the rigidity of the driving spring plate, the reciprocating motion of the slider can drive the driving spring plate to swing left and right, drive the driving rod to produce sufficient deflection, and at the same time the driving spring plate has a certain elasticity. When the deflection of the rudder surface is restricted, the deflection angle of the driving rod is 0, and the elastic deformation of the driving spring plate is used to coordinate the displacement of relevant components; two cylindrical rods are arranged on the top of the slider, and the slider is connected to the driving spring plate through the two cylindrical rods. The cylindrical rods clamp the driving spring plate and slide along the height direction of the driving spring plate.

[0012] Furthermore, the bottom cross-section of the slider is trapezoidal and is placed in the slide rail. The top of the slider is higher than the slide rail groove by a certain height. The bottom of the slider cooperates with the dovetail groove of the slide rail, and the slide rail defines the movement trajectory of the slider.

[0013] The two cylindrical rods are short cylindrical rods, the length of which is greater than the width of the driving spring plate and fixed to the top of the slider. The two cylindrical rods clamp the driving spring plate and slide along the height direction of the driving spring plate. A short double-ear rod extends from the cylindrical rod close to the eccentric wheel side, and the slider is connected to the connecting ring on the eccentric wheel through the short double-ear rod and the second connecting rod, thereby generating reciprocating motion along the axis direction of the slide rail.

[0014] Furthermore, the hexagonal cylindrical surface of the rotary drive sleeve is connected to the rudder surface rotating shaft, the cylindrical surface size is adapted to the inscribed hexagon of the rudder surface rotating shaft, and the length and thickness of the rotary drive sleeve are required to ensure its effective connection with the rudder surface rotating shaft; the rudder surface rotating shaft support is located below the rudder surface rotating shaft;

[0015] The first connecting rod and the driving rod are fixedly connected to the outside of the rotating driving sleeve; the driving rod is fixedly connected to the bottom of the wall of the rotating driving sleeve and is used to drive the rotating driving sleeve to rotate; the end of the driving rod is provided with a cross bar parallel to the rudder surface rotation axis and perpendicular to the driving rod, and the cross bar is a short rod, which is placed in the groove of the fork ear and slides relative to the fork ear; when the rotating driving sleeve is not deflected, the lowest point of the cross bar is close to the lowest point of the middle groove of the fork ear, and when the rotating driving sleeve is deflected to the maximum angle, the upper end of the cross bar is close to the upper part of the middle groove of the fork ear, and a fork ear notch is provided in the middle of the ear plate of the fork ear, so that the fork ear and the driving rod do not interfere with each other during rotation.

[0016] Furthermore, the slider is connected to the connecting ring, the second connecting rod is the connecting part between the slider and the connecting ring, the second connecting rod is hinged to the slider, the second connecting rod is fixed to the connecting ring, and the second connecting rod drives the slider to reciprocate along the slide rail; the slide rail is fixed to the front end plate, arranged horizontally, and the slider moves along the slide rail; a certain dovetail angle is set in the slide rail groove to prevent the slider from falling out of the slide rail during movement; the eccentric wheel is divided into two parts: an eccentric wheel shaft and an eccentric wheel disc, and the eccentric wheel shaft is connected to the shaft of the frequency modulation motor; the axis of the eccentric wheel shaft Being at the same horizontal height as the central axis of the slide rail, the lifting platform can control the height of the eccentric wheel and the slider, so that the rotation amplitude can be adjusted; the supporting base plate is the main bearing structure of the frequency modulation and amplitude modulation part, and the front end plate and the rear end plate are welded to the supporting base plate; the frequency modulation motor is installed on the rear end plate, and the motor shaft extends from the front end plate. The shaft is connected to the eccentric wheel and drives the eccentric wheel to rotate, and the slider produces reciprocating motion along the slide rail through the connecting ring, and the frequency of the reciprocating motion is adjustable. The rotation frequency of the frequency modulation motor is the frequency of the reciprocating motion of the slider.

[0017] Furthermore, there are three through holes on the support base plate, corresponding to a support column and two studs respectively, and the height of the support base plate is adjusted by the lifting nuts on the studs; the front end plate is welded to the support base plate, and plays the role of fixing the slide rail and supporting the motor shaft; the rear end plate is fixed to the support base plate, and plays the role of supporting the motor, and can balance the torque generated by the rotation of the motor;

[0018] The rotating shaft of the eccentric wheel is connected to the rotating shaft of the frequency modulation motor. A generatrix of the eccentric wheel coincides with a generatrix of the rotating shaft of the eccentric wheel. The radius is greater than the radius of the rotating shaft. The radius difference is the eccentricity. During the movement, the wheel center of the eccentric wheel rotates around the axis of the rotating shaft of the eccentric wheel to form a circle with a radius of the eccentricity. A connecting ring is arranged on the eccentric wheel. The eccentric rotation causes the end point of the connecting ring to generate a pulsating displacement of a given frequency and amplitude. An annular groove is arranged on the eccentric wheel to limit the sliding of the connecting ring along the axial direction.

[0019] The connecting ring is in the shape of a ring, the inner diameter of which is the same as the diameter of the eccentric wheel. The connecting ring is connected to the eccentric wheel by a pin and can slide relatively in the circumferential direction. A second connecting rod is fixed on the outer ring of the connecting ring, and the other end of the rod is connected to the slider by a pin.

[0020] Furthermore, a stepper motor is installed under the supporting base plate, and the stepper motor drives the lifting nut through the driving gear to adjust the lifting nut, thereby adjusting the height of the supporting base plate and the frequency modulation motor;

[0021] The driving gear is installed on the rotating shaft of the stepping motor, connecting the stepping motor and the lifting nut. The lifting nut is arranged on two studs and is composed of a frustum and an outer edge gear.

[0022] The upper surface of the circular table contacts the supporting bottom plate, the outer edge gear meshes with the driving gear, the inner diameter is adapted to the stud, and the lifting nut controls the height of the supporting bottom plate by moving on the stud.

[0023] The base is rectangular, with a fixed support column and two studs to support the entire lifting device; the driving spring plate can also be fixed on the base to facilitate the coordination of spatial dimensions when moving the position; the support column and the two studs are fixed on the base, and the two lifting nuts are adapted to the two studs and coordinated and synchronized to adjust the height of the support base plate.

[0024] The installation and use method of the whole device of the present invention is as follows: the first step is to determine the position of the rudder surface rotating shaft and its rudder surface rotating shaft support; further, the rotating drive sleeve is connected and positioned with the rudder surface rotating shaft, and the restoring spring, fork ear, and driving spring plate are installed according to the position of each connecting rod; further, the sliding block, eccentric wheel, lifting platform and other devices are connected and installed in sequence (the lifting platform of the present invention is Figure 3 The device shown in the figure is capable of changing the height of the eccentric wheel and the slide rail, so that the slider reciprocates at different heights of the driving spring plate, thereby changing the amplitude of the fork ear, and then changing the deflection angle of the rudder surface), install the base and press it down with a heavy object to ensure the stability of the device, and the entire device is installed; further, determine the height adjustment range of the lifting platform according to the rotation amplitude range, and adjust the height of the lifting platform by a stepper motor; further, select the frequency of the frequency modulation motor according to the required rotation frequency.

[0025] The beneficial effects of the present invention compared with the prior art are:

[0026] The rotary motion driving device for aircraft control surface dynamics experiment of the present invention is composed of a rotary driving part and a frequency modulation and amplitude modulation part. The rotary driving part is composed of a slider that reciprocates along the slide rail, driving the driving spring plate to swing left and right, and the fork ears connected to the driving spring plate to move the rotary driving sleeve, so that the shaft drives the control surface to rotate clockwise (counterclockwise) around the axis. The reciprocating motion of the slider is driven by the frequency modulation motor through the eccentric wheel, so that it produces reciprocating motion on the slide rail. The frequency of the rotary motion is adjusted by the frequency modulation motor. In order to adjust the amplitude of the rotary motion, a lifting platform is set, and the height of the eccentric wheel and the slide rail is changed by lifting the platform, so that the slider reciprocates at different heights of the driving spring plate, thereby changing the amplitude of the fork ears, and then changing the deflection angle of the control surface. The present invention solves the defects existing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of a rotary drive system of a rotary motion drive device for aircraft control surface dynamics experiments according to the present invention;

[0028] Figure 2 It is a schematic diagram of the eccentric structure of the frequency and amplitude modulation system of a rotary motion drive device used in aircraft control surface dynamics experiments;

[0029] Figure 3 A schematic diagram of a lifting platform of a frequency modulation and amplitude modulation system of a rotary motion drive device used for aircraft control surface dynamics experiments;

[0030] Figure 4 A schematic diagram of the connection between a rotary drive sleeve and a fork ear of a rotary motion drive device used in aircraft control surface dynamics experiments;

[0031] Figure 5 A schematic diagram of a slider of a rotary motion driving device used in aircraft control surface dynamics experiments;

[0032] Figure 6 A schematic diagram of the meshing of a driving gear and two lifting nuts of a rotary motion driving device used in aircraft control surface dynamics experiments;

[0033] Figure 7 A schematic diagram of an eccentric wheel of a rotary motion driving device used in aircraft control surface dynamics experiments;

[0034] Figure 8 A schematic cross-sectional view of a lifting nut of a rotary motion driving device used in aircraft control surface dynamics experiments;

[0035] Among them, 1-rotation drive sleeve, 2-rudder surface shaft, 3-rudder surface shaft support, 4-restoring spring, 5-fork ear, 6-drive spring plate, 7-slider;

[0036] 11-first connecting rod, 12-hexagonal prism, 13-driving rod, 14-cross rod, 15-cylindrical rod, 16-second connecting rod, 17-fork ear notch;

[0037] 21-slide rail, 22-front end plate, 23-frequency modulation motor, 24-rear end plate, 25-support bottom plate, 26-eccentric wheel, 27-connecting ring;

[0038] 31-support column, 32-stepping motor, 33-driving gear, 34-lifting nut, 35-stud, 36-base. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail by enumerating examples below. It should be noted that the specific implementation described here is only used to explain the present invention and is not used to limit the present invention.

[0040] like Figure 1 As shown, the rotary motion driving device for aircraft control surface dynamics experiment of the present invention is composed of a rotary driving part and a frequency modulation and amplitude modulation part. The rotary motion driving part includes a rotary driving sleeve 1, a control surface rotating shaft 2, a control surface rotating shaft support 3, a restoring spring 4, a driving spring plate 6, a fork ear 5, and a slider 7; the frequency modulation and amplitude modulation part includes a slide rail 21, a front end plate, a rear end plate 24, a supporting bottom plate 25, a frequency modulation motor 23, a slider 7, an eccentric wheel 26, a connecting ring 27 (including a second connecting rod 16), a stud 35, a supporting column 31, a stepping motor 32, a driving gear 33, and a lifting nut 34.

[0041] The rotary drive part is driven by the slider 7 to reciprocate along the slide rail 21, driving the spring plate 6 to swing left and right, driving the fork ear 5 connected to the spring plate 6 to move the rotary drive sleeve 1, so that the shaft drives the rudder surface to rotate clockwise (counterclockwise) around the axis. The reciprocating motion of the slider 7 is driven by the frequency modulation motor 23 through the eccentric wheel 26, so that it produces reciprocating motion on the slide rail 21, such as Figure 1 The frequency of the rotational motion is adjusted by a frequency-modulated motor. In order to adjust the amplitude of the rotational motion, a lifting platform is set up. By lifting the platform, the height of the eccentric wheel 26 and the slide rail 21 is changed, so that the slider 7 reciprocates at different heights of the driving spring plate 6, thereby changing the amplitude of the fork ear 5, thereby changing the deflection angle of the rudder surface, as shown in FIG. Figure 3 shown.

[0042] The outer surface of the rotating drive sleeve 1 is a cylindrical surface, and the inner surface is a hexagonal prism surface 12. The outer surface of the rotating drive sleeve 1 is connected to two horizontal first connecting rods 11 and a vertical driving rod 13. The hexagonal prism surface 12 is connected to the rudder surface rotating shaft 2, and the axes of the two coincide; the two first connecting rods 11 are fixedly connected to the left and right sides of the sleeve, are in the same straight line with the diameter of the sleeve, and are respectively connected to the restoring spring 4; the driving rod 13 is fixedly connected to the bottom of the sleeve, perpendicular to the axis of the sleeve, and the end of the driving rod 13 is provided with a cross bar 14 parallel to the axis of the sleeve, perpendicular to the driving rod 13, and the cross bar 14 is placed in the groove of the fork ear 5, driven by the fork ear 5 to move around the rotating shaft, and the cross bar 14 slides in the fork ear 5. The rotating drive sleeve 1 is connected to the rudder surface rotating shaft, and the frequency and amplitude of the rotating shaft deflection can be controlled.

[0043] One end of the restoring spring 4 is fixed, and the other end is connected to the first connecting rod 11 of the rotary drive sleeve 1, so as to overcome the system clearance and provide a restoring torque.

[0044] The bottom of the fork ear 5 is connected to the top of the driving spring plate 6, with the opening facing upward. The crossbar 14 of the driving rod 13 is placed inside the opening. The fork ear 5 drives the driving rod 13 to deflect the rotating driving sleeve 1. A fork ear notch 17 is set on the ear plate of the fork ear 5. The fork ear notch 17 is located in the middle of the ear plate, with a height of 2 / 3 of the groove depth and a width greater than the diameter of the driving rod 13, so that the fork ear 5 and the driving rod 13 do not interfere with each other during the rotation process. Figure 4 shown.

[0045] The driving spring plate 6 is a thin and long metal plate with appropriate rigidity. The normal direction of the plate surface is perpendicular to the axis of the rotating shaft, the length direction is perpendicular to the axis of the rotating shaft, the bottom end is fixed, and the top end is connected to the bottom of the fork ear 5. Given the rigidity of the driving spring plate 6, the reciprocating motion of the slider 7 can drive the driving spring plate 6 to swing left and right, and drive the driving rod 13 to produce sufficient deflection. At the same time, the driving spring plate 6 has a certain elasticity. When the deflection of the rudder surface is limited (the deflection angle of the driving rod is 0 at this time), the elastic deformation of the driving spring plate 6 is used to coordinate the displacement of various related components. The slider 7 is associated with the driving spring plate 6 through two cylindrical rods 15. The cylindrical rods 15 clamp the driving spring plate 6 and can slide along the height direction of the driving spring plate 6.

[0046] The bottom cross section of the slider 7 is trapezoidal and is placed in the slide rail 21. The top is higher than the slide rail groove by a certain height. The bottom cooperates with the dovetail groove of the slide rail 21. The slide rail 21 defines the movement trajectory of the slider 7. Two cylindrical rods 15 are set on the top of the slider 7 and are associated with the drive spring plate. The two cylindrical rods 15 are short cylindrical rods. The length of the cylindrical rods 15 is slightly larger than the width of the drive spring plate 6. They are fixed to the top of the slider 7. The two cylindrical rods 15 clamp the drive spring plate 6 and can slide along the height direction of the drive spring plate 6. A short double-ear rod extends from the cylindrical rod close to the lifting platform side, such as Figure 5As shown, the second connecting rod 16 is connected to the connecting ring 27 on the eccentric wheel to generate reciprocating motion along the axis direction of the slide rail.

[0047] The length and diameter of the first connecting rod 11 are determined by the inertia of the rudder surface and the stiffness of the restoring spring 4, ensuring that the first connecting rod 11 does not produce excessive bending and does not produce resonance within the test frequency range. The two first connecting rods 11 are fixed to the left and right of the rotating drive sleeve 1, are in the same straight line with the sleeve diameter, and are respectively connected to the restoring spring 4.

[0048] The hexagonal cylindrical surface 12 of the rotary drive sleeve 1 is connected to the rudder surface shaft 2. The size of the cylindrical surface is adapted to the inscribed hexagon of the rudder surface shaft 2. The length and thickness of the rotary drive sleeve 1 are required to ensure effective connection between the rotary drive sleeve 1 and the rudder surface shaft 2. The first connecting rod 11 and the driving rod 13 are fixedly connected to the outside of the rotary drive sleeve 1.

[0049] The driving rod 13 is fixedly connected to the wall of the rotating driving sleeve 1 just below, and is used to drive the rotating driving sleeve 1 to rotate. The end of the driving rod 13 is provided with a cross bar 14 which is parallel to the rotating shaft and perpendicular to the driving rod. The cross bar 14 is a short bar which is placed in the groove of the fork ear 5 and slides relative to the fork ear 5. When the rotating driving sleeve 1 is not deflected, the lowest point of the cross bar 14 is close to the lowest point of the groove in the fork ear 5. When the rotating driving sleeve 1 is deflected to the maximum angle, the upper end of the cross bar 14 is close to the upper part of the groove in the fork ear 5. A fork ear notch 17 is provided in the middle of the ear plate of the fork ear 5, so that the fork ear 5 and the driving rod 13 do not interfere with each other during the rotation process.

[0050] The second connecting rod 16 is a connecting component between the slider 7 and the connecting ring 27 , is hinged to the slider 7 , and is fixed to the connecting ring 27 . The second connecting rod 16 drives the slider 7 to reciprocate along the slide rail.

[0051] The slide rail 21 is fixed on the front end plate and arranged horizontally, and the slider 7 moves along the slide rail 21. The slide rail groove is set with a certain dovetail angle to prevent the slider 7 from slipping out of the slide rail during movement. The axis of the eccentric wheel 26 and the central axis of the slide rail 21 are at the same horizontal height, which can realize the height control of the eccentric wheel 26 and the slider 7 by the lifting platform, so that the rotation amplitude can be adjusted.

[0052] The frequency modulation motor 23 is installed on the rear end plate 24, driving the eccentric wheel 26 to rotate, and through the connecting ring 27, the slider 7 generates reciprocating motion along the slide rail, and the frequency of the reciprocating motion is adjustable. The rotation frequency of the frequency modulation motor 23 is the frequency of the reciprocating motion of the slider 7.

[0053] The support base plate 25 is the main bearing structure of the FM part. The front end plate and the rear end plate 24 are welded to the support base plate 25. There are three through holes on the support base plate 25, corresponding to a support column 31 and two studs 35 respectively. The height of the support base plate 25 is adjusted by the lifting nuts 34 on the studs. The front end plate is welded to the support base plate 25 to fix the slide rail and support the motor shaft. The rear end plate 24 is fixed to the support base plate 25 to support the motor and balance the torque generated by the rotation of the motor.

[0054] The rotating shaft of the eccentric wheel 26 is connected to the rotating shaft of the frequency modulation motor 23. A generatrix of the eccentric wheel coincides with a generatrix of the rotating shaft of the eccentric wheel. The radius is greater than the radius of the rotating shaft. The radius difference is the eccentricity. During the movement, the wheel center of the eccentric wheel rotates around the axis of the rotating shaft of the eccentric wheel to form a circle with a radius of the eccentricity. A connecting ring 27 is provided on the eccentric wheel 26. The eccentric rotation causes the end point of the connecting ring 27 to generate a pulsating displacement of a given frequency and amplitude. An annular groove is provided on the eccentric wheel 26 to limit the sliding of the connecting ring 27 along the axial direction.

[0055] The connecting ring 27 is in the shape of a ring, and the inner diameter of the ring is the same as the diameter of the eccentric wheel 26. The connecting ring 27 is connected to the eccentric wheel 26 by a pin and can slide relative to the eccentric wheel 26 in the circumferential direction. A second connecting rod 16 is fixed to the outer ring of the connecting ring 27, and the other end of the rod is connected to the slider 7 by a pin. Figure 2 shown.

[0056] The stepper motor 32 is installed under the supporting base plate 25 . The stepper motor 32 drives the lifting nut 34 through the driving gear 33 , so as to adjust the lifting nut 34 , thereby adjusting the height of the supporting base plate 25 and the frequency modulation motor 23 .

[0057] The driving gear 33 is mounted on the rotating shaft of the stepping motor 32, connecting the stepping motor 32 and the lifting nut 34. The lifting nut 34 is arranged on two studs 35, and is composed of a truncated cone and an outer edge gear. Figure 8 The upper surface of the truncated table contacts the supporting base plate 25, the outer edge gear meshes with the driving gear 33, and the inner diameter is adapted to the stud 35, as shown. Figure 6 The lifting nut 34 controls the height of the supporting base plate 25 by moving on the stud 35 .

[0058] The base 36 is rectangular and has three support columns fixed on it, which plays the role of supporting the entire lifting device. The base should be of sufficient size and can be pressed down with a counterweight to ensure the stability of the support. The arrangement distance between the stud 35 and the support column 31 should take into account the size of the frequency modulation motor 23. The driving spring plate 6 can also be selected to be fixed on the base 36 to facilitate the coordination of the spatial dimensions when moving the position. The support column 31 and the two studs 35 are all fixed on the base 36, and the two lifting nuts 34 are adapted to the two studs 35, and are coordinated and synchronized to adjust the height of the support base plate 25.

[0059] In summary, the installation and use methods of the entire device are as follows: the first step is to determine the position of the rudder shaft 2 and its shaft support; further, connect and position the rotation drive sleeve 1 and the rudder shaft 2, and install the restoring spring 4, fork ear 5, and drive spring plate 6 according to the position of each connecting rod; further, connect and install the slider 7, eccentric wheel 26, lifting platform and other devices in sequence, install the base 36 and press it with a heavy object to ensure the stability of the device, and the entire device is installed; further, determine the height adjustment range of the lifting platform according to the rotation amplitude range, and adjust the height of the lifting platform by a stepper motor; further, select the frequency of the frequency modulation motor according to the required rotation frequency.

[0060] The present invention is described below with specific data examples. Taking a rudder with a shaft diameter of 8 mm as an example, it is required that the frequency range of the device drive is 30 to 45 Hz, and the amplitude range of the rudder deflection vibration is 10° to 30°.

[0061] The outer diameter of the rotary drive sleeve 1 is selected to be 16mm, the inner hexagonal side length of the hexagonal prism is 4mm, and the circumscribed circle diameter is 8mm; the sleeve wall thickness is about 3-4mm, and the sleeve length is 20mm. The rotary drive sleeve 1 is made of high modulus and high hardness material, and the hexagonal prism part is nested and connected with the rotating shaft of the rudder surface and locked with a pin, so that the rotary drive sleeve 1 can rotate synchronously with the rotating shaft of the rudder surface.

[0062] The stiffness of the restoring spring and the length and diameter of the connecting rod are determined according to the inertia data. The stiffness of the restoring spring 4 is selected to be 0.2N / mm to overcome the system gap and provide a restoring torque. The length of the first connecting rod 11 is selected to be 50-60mm and the diameter is 4mm to ensure that the first connecting rod 11 does not bend too much and does not resonate within the frequency range of the test.

[0063] The diameter of the driving rod 13 is determined to be 4 mm and the length is 40-50 mm. The crossbar 14 at the end of the driving rod 13 is selected to be 4 mm in diameter and 12 mm in length, and is placed in the groove of the fork ear 5 so as to slide relative to the fork ear 5.

[0064] The length of the fork ear 5 is determined to be 30mm and the width is 16mm; the depth of the fork ear groove is 25mm and the width is 8mm, and the cross bar 14 of the driving rod 13 is placed inside; the depth of the fork ear notch 17 on the ear plate is 17mm and the width is 6mm.

[0065] The length of the driving spring plate 6 is determined to be 300 mm, the width is 10 mm, the thickness is 2.5 mm, the stiffness of the spring plate at the 100 mm position is 2.34 N / mm, and the stiffness at the 200 mm position is 0.82 N / mm. The material of the spring plate is 65Mn spring steel, and its density is 7.85 g / cm 3, the elastic modulus is 210GPa. According to the Euler beam theory, the natural frequency of the spring plate is 23.21Hz, which is lower than the lowest frequency of use and will not resonate; the working range of the cylindrical rod 15 is 100-200mm from the height of the spring plate to the table surface, and different heights can be adjusted according to different amplitude requirements.

[0066] Determine that the size a of the slider 7 is 20mm, b is 14mm, the bottom of the cross section is an isosceles trapezoid, the size c is 5mm, d is 10mm, the trapezoid bottom angle θ is 68°, and e is 4mm. Two cylindrical rods 15 are connected to the top of the slider 7, the rod diameter is 8mm, and the length is 15mm. A short rod with two ears extends from the cylindrical rod close to the lifting platform side, and is connected to the second connecting rod 16 through a pin with a diameter of 2mm. The driving spring plate 6 is clamped between the two rods for reciprocating motion. The reciprocating motion amplitude of the slider is selected to be within the range of 25-30mm. The length of the slide rail 21 is selected to be 70-80mm, the width is 20mm, the slide rail groove is 5mm deep, and the dovetail angle is 68° to prevent the slider 7 from slipping out of the slide rail during movement.

[0067] The eccentricity of the eccentric wheel 26 is determined to be 14mm, the diameter of the eccentric wheel shaft is set to 20mm, the wheel disc diameter is 48mm, and the thickness is 6mm; the cross-sectional dimensions of the second connecting rod 16 are 8mm×6mm, and the length is 60mm, so as to ensure the generation of a pulsating displacement of a given frequency and amplitude. In the present invention, the length of the eccentric wheel shaft is the same as the thickness of the eccentric wheel disc, the eccentric wheel shaft is virtualized, and the axis of the eccentric wheel shaft coincides with the axis of the frequency modulation motor shaft, such as Figure 7 During the installation process, a through hole with a diameter of 8 mm is dug at the center of the eccentric wheel shaft, and the wheel disc and the frequency modulation motor shaft are connected by a key.

[0068] The size of the supporting bottom plate 25 is determined to be 280mm×240mm and 5mm thick; the size of the front end plate is 80mm×70mm and 5mm thick; the size of the rear end plate 24 is 120mm×120mm and 5mm thick; the size of the base 36 is 320mm×280mm, so as to drive the installation of the spring plate 6 and press the weight to ensure the stability of the device.

[0069] The support column 31 is determined to have a diameter of 20 mm and a height of 250 mm. The two studs 35 are both 20 mm in diameter and 250 mm in height, and the straight-line distance between the studs is 120 mm. The distance between the midpoint of the position line of the studs 35 and the support column 31 is 200 mm.

[0070] The inner diameter of the driving gear 33 is determined to be 6.4 mm, which is compatible with the diameter of the stepper motor shaft, the pitch circle diameter is 100 mm, the number of teeth is 25, and the tooth thickness is 10 mm; the lifting nut 34 is composed of a frustum and an outer edge gear. Figure 8As shown. Among them, the outer diameter of the truncated cone is 40mm, the length is 20mm, the pitch circle diameter of the outer gear is 68mm, the number of teeth is 17, the tooth thickness is 10mm, the tooth angle and module of the two gears are equal, and the center distance is 84.9mm. The inner diameter of the lifting nut 34 is 20mm, and a thread is set inside. The thread starts from the lower surface of the outer gear, and the thread length is 20mm, which is adapted to the outer diameter of the stud; the lifting nut 34 controls the height of the support base plate 25 by moving on the stud 35.

[0071] The model of the frequency-modulated motor 23 is determined to be a 90ZYT04 permanent magnet DC motor. The motor size is 127mm×95mm, the rated speed is 3000rpm, the torque is 294mN·m, the adjustable range of rotation frequency is 10-50Hz; within the range of 100-200mm, the adjustable range of the rudder rotation amplitude is 10°-30°; the rated power is 230W, the rated voltage is 220V, and the current is not more than 1.5A; the installation form is the outer edge of the casing (A5). The frequency-modulated motor 23 makes the frequency of reciprocating motion adjustable.

[0072] The model of the stepper motor 32 is determined to be a 57BYG hybrid stepper motor. The motor size is 47.14mm×41mm, the step angle is 1.8°, and the holding torque is 3N·mm. The stepper motor 32 serves to adjust the lifting nut 34, thereby adjusting the height of the support base plate 25 and the frequency modulation motor 23. The stepper motor 32 is installed in such a way that the gear part of the driving gear 33 and the lifting nut 34 are as close to the support base plate 25 as possible.

[0073] In the present invention, the constraint on the rudder is ultimately provided by the support arm of the support frame, and the material and size need to be selected according to the specific size of the aircraft and the power of the rudder servo. The size provided in this example is intended to illustrate the present invention, not to limit the present invention. At the same time, the wing itself will also vibrate at high frequency during the test, and the connection method between the support arm and the rear wall also needs to be shock-resistant and tensile-resistant. The motor can be controlled by remote control, and its rotation in different directions of clockwise and counterclockwise is controlled to drive the eccentric wheel 26.

[0074] In the present invention, an annular groove is provided on the eccentric wheel 26, which is connected by a pin, and can slide relative to each other in the circumferential direction, but cannot move relative to each other in the axial direction. Therefore, the contact surface between the eccentric wheel 26 and the connecting ring 27 needs to be as smooth as possible, and the contact surface between the annular groove on the eccentric wheel 26 and the pin also needs to be as smooth as possible, so that the friction force is as small as possible, so that the driving force of the frequency modulation motor 23 can be transmitted as much as possible as the force acting on the slider 7.

[0075] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A rotary motion driving device for aircraft control surface dynamics experiment, characterized in that: The device comprises a rotary drive sleeve (1), the outer surface of the rotary drive sleeve (1) is a cylindrical surface, the inner surface of the rotary drive sleeve (1) is a hexagonal prism surface (12), and the outer surface of the rotary drive sleeve (1) is connected to two horizontal first connecting rods (11) and a vertical driving rod (13); The hexagonal prism surface (12) is connected to the rudder surface rotation shaft (2), and the axes of the two coincide with each other.

2. A rotary motion driving device for aircraft control surface dynamics experiment according to claim 1, characterized in that: Two first connecting rods (11) in the horizontal direction are fixedly connected to the left and right sides of the rotating drive sleeve (1), are in the same straight line as the diameter of the rotating drive sleeve (1), and are respectively connected to the restoring spring (4); the driving rod (13) is fixedly connected to the bottom of the sleeve, and is perpendicular to the axis of the sleeve. The end of the driving rod (13) is provided with a cross bar (14) parallel to the axis of the sleeve. The cross bar (14) is perpendicular to the driving rod (13) and is placed in the groove of the fork ear (5). The cross bar (14) is driven by the fork ear (5) to move around the rotating shaft, and the cross bar (14) slides in the fork ear (5); the rotating drive sleeve (1) is connected to the rudder surface rotating shaft (2) to control the frequency and amplitude of the rotating shaft deflection.

3. A rotary motion driving device for aircraft control surface dynamics experiment according to claim 2, characterized in that: One end of the restoring spring (4) is fixed, and the other end of the restoring spring (4) is connected to the first connecting rod (11) of the rotating drive sleeve (1) to overcome the system gap and provide a restoring torque; the length and diameter of the first connecting rod (11) depend on the inertia of the rudder surface and the stiffness of the restoring spring (4) to ensure that the first connecting rod (11) does not produce excessive bending and does not resonate within the frequency range of the test; the two first connecting rods (11) are fixed to the left and right of the rotating drive sleeve (1), are in the same straight line as the sleeve diameter, and are respectively connected to the restoring spring (4).

4. A rotary motion driving device for aircraft control surface dynamics experiment according to claim 2, characterized in that: The bottom of the fork ear (5) is connected to the top of the driving spring plate (6), the opening of the fork ear (5) is upward, and the driving rod (13) and the cross bar (14) are placed inside the opening; the fork ear (5) drives the driving rod (13) to deflect the rotating driving sleeve (1); The fork ear notch (17) is arranged on the ear plate of the fork ear (5), the fork ear notch (17) is located in the middle of the ear plate, the height of the fork ear notch (17) is 2 / 3 of the depth of the fork ear (5) groove, and the width of the fork ear notch (17) is greater than the diameter of the driving rod (13), so that the fork ear (5) and the driving rod (13) do not interfere with each other during the rotation process.

5. A rotary motion driving device for aircraft control surface dynamics experiment according to claim 4, characterized in that: The driving spring plate (6) is a slender strip metal plate with appropriate rigidity, the normal direction of the plate surface is perpendicular to the axial direction of the rudder surface rotating shaft (2), the length direction is perpendicular to the axial direction of the rotating shaft, the bottom end is fixed, and the top end is connected to the bottom of the fork ear (5); two cylindrical rods (15) are installed on the top of the slider (7) to clamp the driving spring plate (6); given the rigidity of the driving spring plate (6), the reciprocating motion of the slider (7) can drive the driving spring plate (6) to swing left and right, and drive the driving rod (13) to generate sufficient deflection, and the spring plate (6) has a certain elasticity. When the deflection of the rudder surface is restricted, the deflection angle of the driving rod (13) is 0, and the elastic deformation of the driving spring plate (6) is used to coordinate the displacement of various related components; two cylindrical rods (15) are arranged on the top of the slider (7), and the slider (7) is connected to the driving spring plate (6) through the two cylindrical rods (15). The cylindrical rods (15) clamp the driving spring plate (6) and slide along the height direction of the driving spring plate (6).

6. A rotary motion driving device for aircraft control surface dynamics experiment according to claim 5, characterized in that: The bottom cross-section of the slider (7) is trapezoidal and is placed in the slide rail (21). The top of the slider (7) is higher than the slide rail groove by a certain height. The bottom of the slider (7) cooperates with the dovetail groove of the slide rail (21). The slide rail (21) defines the movement trajectory of the slider (7). The two cylindrical rods (15) are cylindrical short rods, the length of which is greater than the width of the driving spring plate (6), and are fixedly connected to the top of the slider (7). The two cylindrical rods (15) clamp the driving spring plate (6) and slide along the height direction of the driving spring plate (6). A double-ear short rod extends from the cylindrical rod on one side of the eccentric wheel (26), and the slider (7) is connected to the connecting ring (27) on the eccentric wheel (26) through the double-ear short rod and the second connecting rod (16), so as to generate reciprocating motion along the axis direction of the slide rail.

7. The rotary motion driving device for aircraft control surface dynamics experiment according to claim 1, characterized in that: The hexagonal cylindrical surface (12) of the rotary drive sleeve (1) is connected to the rudder surface rotating shaft (2), the size of the cylindrical surface is adapted to the inscribed hexagon of the rudder surface rotating shaft (2), and the length and thickness of the rotary drive sleeve (1) are required to ensure effective connection between the rudder surface rotating shaft (2); the rudder surface rotating shaft support (3) is located below the rudder surface rotating shaft (2); The first connecting rod (11) and the driving rod (13) are fixedly connected to the outside of the rotating driving sleeve (1); the driving rod (13) is fixedly connected to the bottom of the wall of the rotating driving sleeve (1) and is used to drive the rotating driving sleeve (1) to rotate; the end of the driving rod (13) is provided with a cross bar (14) which is parallel to the rudder rotating shaft (2) and perpendicular to the driving rod, and the cross bar (14) is a short rod, which is placed in the groove of the fork ear (5) and slides relative to the fork ear (5); when the rotating driving sleeve (1) is not deflected, the lowest point of the cross bar (14) is close to the lowest point of the middle groove of the fork ear (5); when the rotating driving sleeve (1) is deflected to the maximum angle, the upper end of the cross bar (14) is close to the upper part of the middle groove of the fork ear (5), and a fork ear notch (17) is provided in the middle of the ear plate of the fork ear (5), so that the fork ear (5) and the driving rod (13) do not interfere with each other during the rotation process.

8. The rotary motion driving device for aircraft control surface dynamics experiment according to claim 5, characterized in that: The slider (7) is connected to the connecting ring (27), the second connecting rod (16) is a connecting component between the slider (7) and the connecting ring (27), the second connecting rod (16) is hinged to the slider (7), the second connecting rod (16) is fixed to the connecting ring (27), and the second connecting rod (16) drives the slider (7) to reciprocate along the slide rail; the slide rail (21) is fixed on the front end plate (22), arranged horizontally, and the slider (7) moves along the slide rail (21); a certain dovetail angle is set in the groove of the slide rail (21) to prevent the slider (7) from escaping from the slide rail during movement; the eccentric wheel (26) is divided into two parts: an eccentric wheel shaft and an eccentric wheel disc, and the eccentric wheel shaft is connected to the shaft of the frequency modulation motor (23); the eccentric wheel (26) ) is at the same horizontal height as the central axis of the slide rail (21), so that the lifting platform can control the height of the eccentric wheel (26) and the slider (7), so that the rotation amplitude can be adjusted; the supporting base plate (25) is the main bearing structure of the frequency modulation and amplitude modulation part, and the front end plate (22) and the rear end plate (24) are welded to the supporting base plate (25); the frequency modulation motor (23) is installed on the rear end plate (24), the motor shaft extends from the front end plate (22), the shaft is connected to the eccentric wheel (26), and drives the eccentric wheel (26) to rotate, and through the connecting ring (27), the slider (7) generates a reciprocating motion along the slide rail, and the frequency of the reciprocating motion is adjustable, and the rotation frequency of the motor (23) is the frequency of the reciprocating motion of the slider (7).

9. A rotary motion driving device for aircraft control surface dynamics experiment according to claim 8, characterized in that: The support base plate (25) has three through holes, which correspond to a support column (31) and two studs (35) respectively. The height of the support base plate (25) is adjusted by means of lifting nuts (34) on the studs. The front end plate (22) is welded to the support bottom plate (25) to fix the slide rail and support the motor shaft; the rear end plate (24) is fixed to the support bottom plate (25) to support the motor and balance the torque generated by the rotation of the motor; The rotating shaft of the eccentric wheel (26) is connected to the rotating shaft of the frequency modulation motor (23), a generatrix of the eccentric wheel coincides with a generatrix of the rotating shaft of the eccentric wheel, the radius is greater than the radius of the rotating shaft, and the radius difference is the eccentricity; during the movement, the wheel center of the eccentric wheel rotates around the axis of the rotating shaft of the eccentric wheel to form a circle with a radius equal to the eccentricity; a connecting ring (27) is provided on the eccentric wheel (26), and the eccentric rotation causes the end point of the connecting ring (27) to generate a pulsating displacement with a given frequency and amplitude; an annular groove is provided on the eccentric wheel (26) to limit the sliding of the connecting ring (27) along the axial direction; The connecting ring (27) is in the shape of a circular ring, the inner diameter of which is the same as the diameter of the eccentric wheel (26), and is connected to the eccentric wheel (26) by a pin and can slide relative to each other in the circumferential direction; a connecting rod (16) is fixed on the outer ring of the connecting ring (27), and the other end of the rod is connected to the slider (7) by a pin.

10. The rotary motion driving device for aircraft control surface dynamics experiment according to claim 8, characterized in that: The stepper motor (32) is installed below the supporting base plate (25). The stepper motor (32) drives the lifting nut (34) through the driving gear (33), and plays a role in adjusting the lifting nut (34), thereby adjusting the height of the supporting base plate (25) and the frequency modulation motor (23); The driving gear (33) is installed on the rotating shaft of the stepping motor (32), connecting the stepping motor (32) and the lifting nut (34); the lifting nut (34) is arranged on two studs (35), and is composed of a truncated cone and an outer edge gear. The upper surface of the circular table contacts the supporting base plate (25), the outer edge gear meshes with the driving gear (33), the inner diameter is adapted to the stud (35), and the lifting nut (34) controls the height of the supporting base plate (25) by moving on the stud (35). The base (36) is rectangular and fixed with the support column (31) and the two studs (35) to support the entire lifting device; the driving spring plate (6) can also be fixed on the base (36) to facilitate the coordination of spatial dimensions when the position is moved; the support column (31) and the two studs (35) are all fixed on the base (36), and the two lifting nuts (34) are adapted to the two studs (35) and coordinated and synchronized to adjust the height of the supporting bottom plate (25).

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