Engine seven-degree-of-freedom test system

Abstract

The invention relates to a seven-degree-of-freedom test system for an engine. The device comprises a base station, a rotary frame rotatably mounted at the top of the base station, a first movement mechanism mounted on one side of the rotary frame and used for simulating yawing movement, and a second movement mechanism mounted on the first movement mechanism and used for simulating pitching movement, the third movement mechanism is installed on the second movement mechanism and used for simulating rolling movement, and the rotating axis of the reversing frame is arranged in the vertical direction. The engine seven-degree-of-freedom test system is compact in structure, mechanical properties of the test engine in flight states of yawing, pitching, rolling and the like are simulated under the condition that the test engine has large acceleration, the motion frequencies of three rotation degrees of freedom of yawing, pitching and rolling can be adjusted according to needs, the three degrees of freedom can be linked, the test range is wider, and the test efficiency is improved. And the device is suitable for long-term operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aero-engine test, and particularly relates to an engine seven-degree-of-freedom test system. BACKGROUND

[0002] An aero-engine is a highly complex and precise thermodynamic machine that provides the required power for an aircraft to fly. Testing an aero-engine is an extremely critical and indispensable link, which involves safety, reliability, performance, airworthiness certification, cost control, and continuous improvement, and many other important aspects.

[0003] During flight, yaw, pitch, and roll are three movements that are indispensable for the aircraft to turn around and ascend / descend. At this time, it is particularly important to simulate the mechanical properties and other parameters of the engine under the flight conditions of yaw, pitch, and roll with a large acceleration.

[0004] The existing simulation test system can only simulate and test one state, and the states cannot be linked and coordinated with each other. Therefore, the mechanical properties of the engine under a mixture of multiple states cannot be simulated, and there is a large limitation. In addition, different simulation systems need to be used for different state tests, which is low in testing efficiency and high in testing cost. SUMMARY

[0005] The present application provides an engine seven-degree-of-freedom test system, which solves the defect that the existing simulation test system can only simulate and test one state, and the states cannot be linked and coordinated with each other.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows: an engine seven-degree-of-freedom test system, which comprises: a base, a slewing ring rotatably mounted on the top of the base, a first movement mechanism mounted on one side of the slewing ring and used for simulating yaw movement, a second movement mechanism mounted on the first movement mechanism and used for simulating pitch movement, and a third movement mechanism mounted on the second movement mechanism and used for simulating roll movement, wherein the rotation axis of the slewing ring is arranged in a vertical direction.

[0007] Optimally, it further comprises a top bracing mechanism mounted between the slewing ring and the base, and a clamping mechanism fixed in the third movement mechanism.

[0008] Optimally, the first movement mechanism comprises a second mounting frame rotatably mounted on one side of the slewing ring, and the rotation axis of the second mounting frame is arranged in a vertical direction.

[0009] Optimally, the second movement mechanism comprises a turnover ring rotatably mounted on the inner side of the second mounting frame, and the turnover axis of the turnover ring is arranged in a horizontal direction.

[0010] Optimally, the third movement mechanism comprises a third mounting frame rotatably mounted in the turnover frame, and the rotation axis of the third mounting frame is arranged along a vertical direction.

[0011] Optimally, the clamping mechanism comprises a mounting plate and a clamping head fixed on the top of the mounting plate, the clamping head comprises a chuck, a first shrink block slidingly connected in the chuck and annularly arranged, a lifting block arranged on the top of the chuck in a liftable manner, an inclined slot obliquely arranged in the inner side of the lifting block, and an inclined pin integrally connected on the bottom of the first shrink block and matched with the inclined slot.

[0012] Optimally, the clamping head further comprises a second shrink block fixed on the top of the first shrink block, a clamping slot arranged in the inner side of the second shrink block, a clamping plate pivotally connected in the clamping slot, a butt head integrally connected on both sides of the clamping plate, and a contact part arranged in the inner side of the butt head.

[0013] Optimally, the top support mechanism comprises a first guide rail fixed on the top of the base, and a roller rotatably mounted on the bottom of the swivel frame and abutting against the first guide rail.

[0014] Optimally, the top support mechanism comprises a second guide rail fixed on the top of the base, a guide slot arranged in the inner side of the second guide rail, and a guide block fixed on the bottom of the swivel frame and matched with the guide slot.

[0015] Optimally, the top support mechanism comprises a support strip fixed on the top of the base, a rolling ball rollingly mounted in the support strip, and a butt plate fixed on the bottom of the swivel frame and abutting against the rolling ball.

[0016] Thanks to the use of the above technical solutions, the present application has the following advantages compared with the prior art: The engine seven-freedom test system of the present application has a compact structure, and can simulate the mechanical properties of a test engine in a flight state of yaw, pitch and roll under a large acceleration condition. The movement frequency of the three rotary freedoms of yaw, pitch and roll can be adjusted as required, and the three freedoms can be linked, so that the test range is wider, the work is maintenance-free, and the system is suitable for long-term operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of the present application; Figure 2 FIG. 2 is a working principle diagram of the present application; Figure 3 FIG. 3 is a partial enlarged view of the test box in the present application; Figure 2 FIG. 4 is a schematic diagram of the clamping mechanism in the test box of the present application; Figure 4 FIG. 5 is a schematic diagram of the clamping mechanism in the test box of the present application.Figure 5 This is a schematic diagram of the clamping mechanism of the present invention; Figure 6 This is a partial cross-sectional view of the clamping mechanism of the present invention; Figure 7 This is a schematic diagram of the top support mechanism in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the top support mechanism in Embodiment 2 of the present invention; Figure 9 This is a schematic diagram of the top support mechanism in Embodiment 3 of the present invention; Explanation of reference numerals in the attached figures: 1. Base; 2. First mounting bracket; 3. First motor; 4. First driving gear; 5. First driven gear; 6. Drive shaft; 7. Crossbeam; 8. Counterweight box; 9. Test chamber; 10. Second motor; 11. Second driving gear; 12. Second driven gear; 13. Mounting shaft; 14. Mounting sleeve; 15. Second mounting bracket; 16. Third motor; 17. Third driving gear; 18. Third driven gear; 19. Tilting frame; 20. Fourth motor; 21. Fourth driving gear; 22. Fourth driven gear; 23. Third mounting... Frame; 24. Fixing plate; 25. Lifting cylinder; 26. Mounting plate; 27. Clamping plate; 28. First shrinking block; 29. ​​Second shrinking block; 30. Clamping groove; 31. Clamping plate; 32. Abutment; 33. Contact part; 34. Inclined pin; 35. Lifting block; 36. Inclined groove; 37. First guide rail; 38. Wheel frame; 39. Roller; 40. Second guide rail; 41. Guide groove; 42. Guide block; 43. Connecting plate; 44. Support plate; 45. Ball groove; 46. Clamping plate; 47. Clamping groove; 48. Rolling ball; 49. Abutment plate. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings. Example 1

[0019] like Figure 1 , 2 The diagram shown is a structural schematic and working principle diagram of the engine seven-degree-of-freedom test system of the present invention. The base 1 is installed on the test workbench and mainly serves as a load-bearing structure to support the subsequent test structure. The base 1 is usually ring-shaped to match the running trajectory of the test structure above, while saving floor space (the shape of the base 1 is not limited to ring).

[0020] The first mounting frame 2 is in a box structure and is fixed on the top of the base 1 by screw fastening. The first mounting frame 2 is internally hollow for mounting the driving mechanism. The outer side wall of the first motor 3 is fixed on the inner side wall of the first mounting frame 2 by a metal plate (specifically, the metal plate can be an L-shaped angle plate, one side of the L-shaped angle plate is fixed on the inner side wall of the first mounting frame 2 by welding, and the shell of the first motor 3 is fixed on the other side of the L-shaped angle plate by screw fastening. The fixing mode of the motor is a conventional fixing mode. The installation modes of the second motor 10, the third motor 16 and the fourth motor 20 are the same as that of the first motor 3).

[0021] The first driving tooth 4 is installed on the motor shaft of the first motor 3 by key connection and is driven to rotate by the first motor 3. The driving shaft 6 is installed in the first mounting frame 2 in the vertical direction, and in order to ensure the stability of the rotation of the driving shaft 6, the driving shaft 6 is connected with the base 1 and the first mounting frame 2 through bearings. The first driven tooth 5 is fixed on the driving shaft 6 by key connection and is engaged with the first driving tooth 4.

[0022] The first driving tooth 4 is driven to rotate by the first motor 3, and since the first driving tooth 4 is engaged with the first driven tooth 5, the first driven tooth 5 is driven to rotate, and finally the driving shaft 6 is driven to rotate.

[0023] The cross beam 7 is fixed on the top of the driving shaft 6 by welding, i.e. on the side of the driving shaft 6 away from the base 1. When the driving shaft 6 rotates, the cross beam 7 is driven to rotate, and in turn the test box 9 on one side of the cross beam 7 is synchronously driven to rotate, so as to simulate the environment of rotary motion.

[0024] The counterweight box 8 is fixed on one side of the cross beam 7, and the test box 9 is fixed on the other side of the cross beam 7. The test box 9 is internally provided with a first motion mechanism, a second motion mechanism and a third motion mechanism for simulating yaw motion, pitch motion and roll motion. The counterweight box 8 is internally provided with a counterweight block for stabilizing the entire cross beam 7 and avoiding tilting of the cross beam 7 due to the difference in weight between the two sides of the cross beam 7.

[0025] The bracing mechanism is installed between the test box 9 and the base 1. When the driving shaft 6 drives the test box 9 to rotate, the test box 9 is lifted by the bracing mechanism to enhance the rigidity of the structure, thereby reducing the vibration caused by the rotation of the test piece in the test box 9. As shown in Figure 7 The bracing mechanism includes a first guide rail 37, a wheel carrier 38 and a roller 39. The first guide rail 37 is annular and is fixed on the upper surface of the base 1 by screw fastening.

[0026] The wheel frame 38 is fixed on the lower surface of the test box 9 (i.e. the side of the test box 9 close to the base 1) by screw fastening, the wheel frame 38 is in the shape of "[", and the opening of the "["-shaped wheel frame 38 faces downward. The bottom of the wheel frame 38 is rotatably installed with an axle through a bearing, and the roller 39 is fixed on the axle and in contact with the upper surface of the first guide rail 37. When the driving shaft 6 drives the test box 9 to rotate along the axis of the driving shaft 6, the test box 9 drives the roller 39 at the bottom to rotate, at this time, the roller 39 rotates against the upper surface of the first guide rail 37, thereby supporting the rotating test box 9.

[0027] By setting the supporting mechanism, the centrifugal force is balanced, the position of the center of mass can be basically kept unchanged, and the instability in the rotation process is reduced or even eliminated.

[0028] As shown in Figure 2 , 3 , the first movement mechanism, the second movement mechanism and the third movement mechanism are installed in the test box 9, and are respectively used for simulating yaw movement, pitch movement and roll movement. The first movement mechanism comprises a second motor 10, a second driving tooth 11, a second driven tooth 12, a mounting shaft 13, a mounting sleeve 14 and a second mounting frame 15, the outer side wall of the second motor 10 is fixed to the inner side wall of the test box 9 through a metal plate, the second driving tooth 11 is installed on the motor shaft of the second motor 10 through key connection, and the second driving tooth 11 is driven to rotate by the second motor 10.

[0029] The mounting shaft 13 is vertically fixed to the inner bottom of the test box 9 and located at one side of the second motor 10, the mounting sleeve 14 is installed on the outer side of the mounting shaft 13 through a bearing, and the mounting sleeve 14 can rotate around the axis of the mounting shaft 13 under the action of the bearing. The second driven tooth 12 is fixed to the outer side of the mounting sleeve 14 through welding and is engaged with the second driving tooth 11, the second driving tooth 11 is driven to rotate by the second motor 10, and since the second driving tooth 11 is engaged with the second driven tooth 12, the second driven tooth 12 is driven to rotate, and finally the mounting sleeve 14 is driven to rotate.

[0030] The second mounting frame 15 is fixed to the top of the mounting sleeve 14 through welding, and the mounting sleeve 14 drives the second mounting frame 15 to rotate when rotating (the rotation axis of the second mounting frame 15 is vertically arranged). The opening of the second mounting frame 15 faces upward and is used for installing the second movement mechanism and the third movement mechanism. As shown in Figure 2 , the steering direction of the first movement mechanism is w2, which is used for simulating yaw movement.

[0031] The second motion mechanism includes a third motor 16, a third driving gear 17, a third driven gear 18, and a tilting frame 19. The third motor 16 is fixed to one side of the second mounting frame 15 by a metal plate. The third driving gear 17 is mounted on the motor shaft of the third motor 16 by a key connection, and the third motor 16 drives the third driving gear 17 to rotate. The tilting frame 19 is mounted on the top of the inner side of the second mounting frame 15, and a bearing seat is horizontally mounted on the second mounting frame 15 corresponding to the position of the tilting frame 19. A bearing is installed in the bearing seat, and a rotating shaft passing through the bearing is fixed to the outer side of the tilting frame 19.

[0032] The third driven gear 18 is fixed on a rotating shaft on one side of the tilting frame 19 and meshes with the third driving gear 17. The third motor 16 drives the third driving gear 17 to rotate, which in turn drives the third driven gear 18 to rotate, ultimately driving the tilting frame 19 to rotate. Figure 2 As shown, the tilting axis of the tilting frame 19 is set in the horizontal direction and rotates at w3 to simulate pitch motion.

[0033] The third motion mechanism includes a fourth motor 20, a fourth driving gear 21, a fourth driven gear 22, and a third mounting bracket 23. The fourth motor 20 is fixed to the inner wall of the tilting frame 19 by a metal plate. The fourth driving gear 21 is mounted on the motor shaft of the fourth motor 20 by a key connection, and the fourth motor 20 drives the fourth driving gear 21 to rotate. Bearing seats are installed on both sides of the tilting frame 19 in the vertical direction, and bearings are installed in the bearing seats. The third mounting bracket 23 is fixed in the bearings (because there is a bearing between the third mounting bracket 23 and the tilting frame 19, the third mounting bracket 23 can rotate relative to the tilting frame 19).

[0034] The fourth driven gear 22 is fitted onto and fixed to the third mounting bracket 23. The fourth driven gear 22 meshes with the fourth driving gear 21. The fourth motor 20 drives the fourth driving gear 21 to rotate, thereby causing the fourth driven gear 22 and the third mounting bracket 23 to rotate. Figure 2 As shown, the rotation axis of the third mounting bracket 23 is set in the vertical direction and the direction of rotation is w4, which is used to simulate rolling motion.

[0035] The clamping mechanism is installed inside the third mounting bracket 23 and is used to clamp the specimen, such as Figures 4-6 As shown, the clamping mechanism includes a fixed plate 24, a lifting cylinder 25, a mounting plate 26, a clamping disc 27, a first shrinking block 28, a second shrinking block 29, a clamping groove 30, a clamping plate 31, a butt 32, a contact part 33, a wedge 34, a lifting block 35, and a wedge groove 36. The fixed plate 24 and the mounting plate 26 are horizontally fixed in the third mounting frame 23, and the fixed plate 24 is parallel to the mounting plate 26. The lifting cylinder 25 is fixed to one side of the fixed plate 24, and the piston rod of the lifting cylinder 25 passes through the mounting plate 26 and is connected to the lifting block 35.

[0036] The clamping plate 27 is fixed to the top of the mounting plate 26. The first shrinking block 28 is slidably connected to the inner side of the clamping plate 27 and is arranged in three sets. The specimen is clamped in the center through the three sets of first shrinking blocks 28 arranged in the circle.

[0037] The lifting block 35 is connected to the lifting cylinder 25 and is located within the clamping plate 27. The lifting cylinder 25 drives the lifting block 35 to move up and down. The inclined groove 36 is inclinedly opened within the lifting block 35. The inclined pin 34 is integrally connected to the top of the first shrinking block 28 and inserted into the inclined groove 36. The lifting cylinder 25 drives the lifting block 35 to move up and down, thereby causing the three sets of first shrinking blocks 28 to move inward or open outward simultaneously, achieving the centering and clamping of the specimen.

[0038] The second shrink block 29 is fixed to the bottom of the first shrink block 28 and moves synchronously with the first shrink block 28. The clamping groove 30 is opened inside the second shrink block 29, and the clamping plate 31 is disposed in the clamping groove 30 and connected to the clamping groove 30 by a pivot. Since the clamping plate 31 is connected to the second shrink block 29 by a pivot, the clamping plate 31 can swing freely in the clamping groove 30.

[0039] The abutment 32 is integrally connected to both sides of the clamping plate 31, and the inner side of the abutment 32 is provided with an arc-shaped contact portion 33. When the first shrink block 28 moves inward, it will drive the second shrink block 29 to move inward synchronously. Due to the pivotal connection between the clamping plate 31 and the second shrink block 29, the clamping plate 31 will swing itself when it moves inward, and finally the clamping plate 31 completes the floating clamping of the specimen (even if there are some defects on the surface of the specimen, such as dents or protrusions, the specimen can still be clamped).

[0040] Each clamping plate 31 has two abutments 32 on its inner side to increase the contact points with the specimen and improve the stability of clamping. The arc-shaped contact part 33 can better match the outer surface of the specimen. Example 2

[0041] The technical solution of Embodiment 2 is basically the same as that of Embodiment 1, the difference being the different supporting mechanism, such as... Figure 8 As shown, the top support mechanism includes a second guide rail 40, a guide groove 41, a guide block 42, and a connecting plate 43. The second guide rail 40 is annular and is fixed to the top of the base 1 by screws. The guide groove 41 is annular and is formed inside the second guide rail 40. The connecting plate 43 is fixed to the bottom of the test chamber 9. The guide block 42 is arc-shaped, fixed to the bottom of the connecting plate 43, and cooperates with the guide groove 41. When the test chamber 9 rotates, it drives the guide block 42 to rotate along the annular guide groove 41 of the second guide rail 40.

[0042] In this embodiment, since the shape of the guide block 42 matches that of the guide groove 41, the test chamber 9 will not exert lateral tension on the guide block 42 when it rotates, making the rotation more stable. Example 3

[0043] Embodiment three is basically the same as the technical solution of embodiment one, with the difference being the different top support mechanism, as shown in Figure 9 The top support mechanism comprises a support plate 44, a ball groove 45, a clamping plate 46, a clamping groove 47, a rolling ball 48 and a stop plate 49. The support plate 44 is annular and fixed on the top of the base 1. The ball groove 45 is semi-spherical and arranged on the top of the support plate 44 in a spaced manner. The rolling ball 48 is in a spherical structure and placed in the ball groove 45. The clamping plate 46 is fixed on the top of the support plate 44 by screw fastening. The clamping groove 47 is annularly arranged on the clamping plate 46 and matches the position of the ball groove 45. The clamping plate 46 is fixed on the support plate 44 and used to clamp the rolling ball 48 in the ball groove 45 to avoid the rolling ball 48 from falling out of the ball groove 45.

[0044] The stop plate 49 is fixed on the bottom of the test box 9 and in contact with the top of the rolling ball 48. When the test box 9 rotates, the stop plate 49 rotates against the top of the rolling ball 48. The contact area of the two is smaller, so the friction is smaller.

[0045] The test system of the present application has simple structure. The test requirements of the aero-engine are designed to test the mechanical properties and lubrication system performance of the engine in the flight states of yaw, pitch and roll under the condition of large acceleration (the yaw motion is simulated by w2 rotation, the pitch motion is simulated by w3 rotation, and the roll motion is simulated by w4 rotation). The electric mode is adopted to easily realize the automatic control of complex motion, realize uniform speed operation, ensure the constant centrifugal acceleration, easily control the ideal speed state, adjust the motion frequency of the three rotation degrees of freedom of yaw, pitch and roll according to the needs, and realize the linkage of the three degrees of freedom, so that the test range is wider, the work is maintenance-free, and the system is suitable for long-term operation.

[0046] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable the person skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A seven-degree-of-freedom engine testing system, characterized in that, It includes: The system comprises a base, a rotatable frame mounted on top of the base, a first motion mechanism mounted on one side of the rotatable frame for simulating yaw motion, a second motion mechanism mounted on the first motion mechanism for simulating pitch motion, and a third motion mechanism mounted on the second motion mechanism for simulating roll motion, wherein the rotation axis of the rotatable frame is arranged in the vertical direction.

2. The engine seven-degree-of-freedom test system according to claim 1, characterized in that: It also includes a top support mechanism installed between the slewing frame and the base (1) and a clamping mechanism fixed in the third motion mechanism.

3. The engine seven-degree-of-freedom test system according to claim 1, characterized in that: The first motion mechanism includes a second mounting bracket (15) rotatably mounted on one side of the rotary frame, the rotation axis of the second mounting bracket (15) being arranged in the vertical direction.

4. The engine seven-degree-of-freedom test system according to claim 3, characterized in that: The second motion mechanism includes a flipping frame (19) rotatably mounted inside the second mounting frame (15), the flipping axis of the flipping frame (19) being arranged in the horizontal direction.

5. The engine seven-degree-of-freedom test system according to claim 4, characterized in that: The third motion mechanism includes a third mounting bracket (23) rotatably mounted in the tilting frame (19), the rotation axis of the third mounting bracket (23) being arranged in the vertical direction.

6. The engine seven-degree-of-freedom test system according to claim 2, characterized in that: The clamping mechanism includes a mounting plate (26) and a clamping head fixed to the top of the mounting plate (26). The clamping head includes a clamping plate (27), a first shrinking block (28) slidably connected to the clamping plate (27) and arranged around it, a lifting block (35) movably disposed on the top of the clamping plate (27), an inclined groove (36) inclinedly opened on the inner side of the lifting block (35), and an inclined pin (34) integrally connected to the bottom of the first shrinking block (28) and cooperating with the inclined groove (36).

7. The engine seven-degree-of-freedom test system according to claim 6, characterized in that: The gripping head also includes a second shrink block (29) fixed to the top of the first shrink block (28), a clamping groove (30) opened inside the second shrink block (29), a clamping plate (31) pivotally connected in the clamping groove (30), abutments (32) integrally connected to both sides of the clamping plate (31), and a contact portion (33) provided inside the abutments (32).

8. The engine seven-degree-of-freedom test system according to claim 2, characterized in that: The top support mechanism includes a first guide rail (37) fixed to the top of the base (1) and a roller (39) rotatably mounted on the bottom of the slewing frame and abutting against the first guide rail (37).

9. The engine seven-degree-of-freedom test system according to claim 2, characterized in that: The top support mechanism includes a second guide rail (40) fixed to the top of the base (1), a guide groove (41) opened inside the second guide rail (40), and a guide block (42) fixed to the bottom of the rotary frame and cooperating with the guide groove (41).

10. The engine seven-degree-of-freedom test system according to claim 2, characterized in that: The top support mechanism includes a support bar fixed to the top of the base (1), a ball (48) rolled inside the support bar, and a stop plate (49) fixed to the bottom of the rotating frame and abutting against the ball (48).

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