Rotor test device blade total pitch angle debugging method

Abstract

A method for adjusting the collective pitch angle of a rotor test device, belonging to the field of icing wind tunnel testing, is disclosed to address the problem of high difficulty in adjusting the collective pitch angle of existing rotor test devices. First, the tilt angles of the fixed support and rotor shaft are adjusted. Then, random data consisting of the random rotor position of the blade angle drive motor and the arithmetic mean of the blade angles is established. This random data is selected as the boundary for interpolating the rotor position. Interpolation calculations are used to obtain the interpolated rotor position corresponding to the target collective pitch angle. If the deviation meets the error requirements, the interpolated rotor position can be used as the theoretical rotor position, thus obtaining the correspondence between the target collective pitch angle and the theoretical rotor position. This invention allows for the rapid acquisition of the correspondence between the blade collective pitch angle and the theoretical rotor position of the blade angle drive motor, significantly shortening the adjustment time.

Description

Technical Field

[0001] This invention belongs to the field of icing wind tunnel testing, and particularly relates to a method for adjusting the collective pitch angle of rotor blades in a rotor testing device. Background Technology

[0002] Wind tunnel testing, a widely adopted method in aerodynamics research, provides essential support for the development of aviation, aerospace, and railway transportation. The rotor is the primary component providing lift for helicopters; rotor blade icing can cause blade vibration, increased torque, and other problems, significantly impacting helicopter flight safety. Compared to flight tests under real icing weather conditions, conducting icing wind tunnel tests to study rotor icing characteristics can significantly reduce research costs and testing risks. Some rotor blade icing tests require that the rotor test device lack periodic pitch control and that the collective pitch angle of each blade be uniformly adjusted to study the rotor blade icing characteristics under a specific collective pitch angle condition. The accuracy of the collective pitch angle and the consistency of the blade angles both affect the icing characteristics. Before conducting wind tunnel tests, the angle control accuracy of the rotor test device's collective pitch angle needs to be adjusted to obtain accurate icing characteristics under different collective pitch angle states. The existing rotor test device is a rotor test device that adjusts the collective pitch angle of each blade uniformly and does not have the function of periodic pitch adjustment. The angle cannot be measured after the blades are installed, and the collective pitch angle required for the test is difficult and time-consuming to adjust. Summary of the Invention

[0003] The purpose of this invention is to provide a method for adjusting the collective pitch angle of rotor blades in a rotor testing device, thereby solving the problem of the high difficulty in adjusting the collective pitch angle of existing rotor testing devices. The technical solution adopted by this invention is as follows:

[0004] A method for adjusting the collective pitch angle of a rotor test device includes the following steps:

[0005] Step 1: Fix and level the fixed support of the test device;

[0006] Step 2: Adjust the tilt angle of the rotor shaft to a vertical position;

[0007] Step 3: Measure the blade angles of several blades in real time;

[0008] Step 4: Establish random data consisting of the random rotor position and the arithmetic mean of the blade angles of the blade angle drive motor;

[0009] Step 5: Calculate the deviation between each blade angle in the random data and the arithmetic mean of the corresponding blade angles. If the deviation is greater than the error requirement, adjust the mechanism clearance and repeat Step 4.

[0010] Step 6: First, select the range of interpolated rotor positions from the random data according to the target collective pitch angle required for the experiment. Obtain the interpolated rotor position through difference calculation. Then, measure the interpolated blade angle of each blade under the interpolated rotor position state and calculate the arithmetic mean of the interpolated blade angle.

[0011] Step 7: Calculate the deviation between the interpolated blade angle arithmetic mean and the target collective pitch angle. If the deviation is greater than the error requirement, take the interpolated rotor position and the corresponding interpolated blade angle arithmetic mean that are greater than the error requirement as new random data, and repeat Step 6 to obtain a new interpolated rotor position and a new interpolated blade angle arithmetic mean until the deviation between the final interpolated blade angle arithmetic mean and the target collective pitch angle meets the requirement. Take the final interpolated rotor position as the theoretical rotor position and record the corresponding data between the theoretical rotor position and the target collective pitch angle.

[0012] Step 8: Repeat steps 6 and 7 to obtain all the theoretical rotor positions and corresponding target collective pitch angle experimental relationship data required for the experiment;

[0013] Step 9: Select some typical data from all the experimental relationship data and test the repeatability deviation of the target total distance angle data. If the deviation exceeds the error requirement, adjust the mechanism clearance and repeat Step 4.

[0014] Step 10: After debugging, reinstall the blades. Using the test relationship data obtained in Step 8, the target collective pitch angle required for the test can be quickly obtained from the theoretical rotor position.

[0015] Furthermore, the specific method of step one is as follows: the four corners of the fixed support of the test device are all threaded with lifting screws, so that the fixed support is supported on the mounting base by the lifting screws. The fixed support is leveled by turning each lifting screw. The plane of the fixed support is measured with an angle measuring instrument until the levelness of the two vertical directions on the plane of the fixed support meets the requirements. Then, the fixed support and the mounting base are tightened by tightening screws.

[0016] Further, the specific method for step two is as follows: remove the upper blade of the rotor hub, several blades, several cranks and pitch box, install the main shaft tilt angle measuring platform on the lower blade of the rotor hub, place an angle measuring instrument on the main shaft tilt angle measuring platform, adjust the tilt angle of the rotor main shaft by tilt motor, observe the reading of the angle measuring instrument until the rotor main shaft is in a vertical state.

[0017] Furthermore, the specific method of step three is as follows: make a blade angle measurement platform with connection conditions consistent with the blades, disassemble the main shaft tilt angle measurement platform, reinstall the upper blade of the blade hub, and use several blade angle measurement platforms to replace several blades and install them between the lower blade of the blade hub and the upper blade of the blade hub. An angle measuring instrument is placed on the blade angle measurement platform to display the blade angle of the corresponding blade in real time.

[0018] Furthermore, the specific method for step four is as follows: Within the required blade angle range for the experiment, arbitrarily select i blade angles to drive the rotor rotation angle of the motor as random rotor positions, and mark them sequentially as follows: , ... Measure the blade angle of each blade at each random rotor position, calculate the arithmetic mean of the random blade angles corresponding to each random rotor position, and label them sequentially. , ... The j-th random blade angle arithmetic mean is labeled as... Let j be any number in i, then Calculated using the following formula:

[0019] ;

[0020] In the formula:

[0021] n is the number of blades;

[0022] The blade angle measurement value of the nth blade at the jth random rotor position;

[0023] The arithmetic mean of i random rotor positions and the corresponding i blade angles is used as random data, where i is a natural number greater than or equal to 2.

[0024] Furthermore, the specific method for step five is as follows: The blade angle of the nth blade under the j-th random rotor position state. and corresponding arithmetic mean The deviation is ,like If the error exceeds the tolerance, adjust the clearance between the blades, crank, and pitch sleeve. If it is less than the error index, then it is considered... Equal to the collective pitch angle of the blades under the corresponding random rotor position state .

[0025] Furthermore, the specific method for step six is ​​as follows: First, based on the target collective distance angle required for any experiment... The size is determined by selecting the arithmetic mean of two adjacent random rotor positions and their corresponding blade angles from the random data. The two selected random positions are defined as follows: and The arithmetic mean of the two blade angles are respectively and Assuming the target blade angle is the arithmetic mean It can be considered equal to Then make < < ,exist and Set interpolation rotor position between , The result is obtained through interpolation:

[0026] ;

[0027] Rotate the rotor of the blade angle drive motor to the interpolation rotor position. Measure the blade angle of each blade at this time, and calculate the arithmetic mean of the interpolated blade angles. .

[0028] Furthermore, the specific method for step seven is as follows: If If it exceeds the error requirement, then Re-marked as ,Will Re-marked as Then and As new random data, repeat step six;

[0029] until If the error requirement is met, then... As the theoretical rotor position ,think It is the collective distance angle of the target. The corresponding rotor rotation angle position of the propeller angle drive motor.

[0030] Furthermore, in steps four through eight, when adjusting the blade angle, in order to avoid the influence of mechanical clearance, each blade moves in one direction to change the blade angle.

[0031] Furthermore, in step two, when adjusting the tilt angle of the rotor main shaft, in order to avoid the influence of mechanical backlash, the rotor main shaft is made to move in one direction to change the tilt angle.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] This invention eliminates the influence of installation and main shaft tilt on blade angle measurement by adjusting the fixed support and rotor shaft tilt angle; it solves the problem of not being able to measure blade angles after installation by machining a blade angle measurement platform parallel to the chord of the blade's characteristic section; it installs angle measurement platforms at all blade positions and uses the arithmetic mean of blade angles as the nominal collective pitch angle of the blades, effectively ensuring the consistency of blade angles and obtaining more accurate icing characteristics during high-speed blade rotation; the relationship between blade collective pitch angle and blade angle drive motor rotor position is non-linear, and the correspondence between blade collective pitch angle and theoretical rotor position of blade angle drive motor can be quickly obtained through interpolation calculation, which can significantly shorten the debugging time. Attached Figure Description

[0034] Figure 1 This is a flowchart of the method of the present invention;

[0035] Figure 2 This is a schematic diagram of the overall structure of the experimental device of the present invention;

[0036] Figure 3 yes Figure 2 AA section view;

[0037] Figure 4 This is a schematic diagram of the collective pitch angle adjustment component;

[0038] Figure 5 yes Figure 4 EE sectional view;

[0039] Figure 6 yes Figure 5 Enlarged view of a section at point C;

[0040] Figure 7 yes Figure 5 Enlarged view of a section at point D;

[0041] Figure 8 yes Figure 4 BB section view;

[0042] Figure 9 This is a schematic diagram showing the connection between the pitch box and the blades;

[0043] Figure 10 This is a schematic diagram showing the variable pitch sleeve slidingly mounted on the variable pitch box;

[0044] Figure 11 This is a schematic diagram of the blade structure;

[0045] Figure 12 This is a schematic diagram of the crank mechanism;

[0046] Figure 13 This is a schematic diagram showing the connection between the spindle tilt angle measurement platform and the lower blade of the propeller hub;

[0047] Figure 14 This is a schematic diagram showing the connection between the blade angle measurement platform and the blade hub.

[0048] In the diagram, 1. Blade, 2. Upper hub plate, 3. Lower hub plate, 4. Rotor main shaft, 5. Guide key, 6. Stationary ring cover, 7. Stationary ring, 8. Anti-torsion arm, 9. Six-component balance, 10. Base, 11. Commutator, 12. Rotor motor, 13. Pitch control push rod, 14. Electric cylinder, 15. Bearing housing, 16. Speed ​​encoder, 17. Coupling, 18. Torque sensor, 19. Moving ring cover, 20. Collective pitch adjustment bearing, 21. Moving ring, 22. Push rod pin, 23. Bearing cover, 24. Main shaft bearing, 25. Locking nut, 26. Blade bearing, 27. Crank, 28. Pressure ring, 29. Upper pitch control box plate, 30. Pitch control sleeve, 31. 32. Lower plate of the pitch box; 33. Slide groove; 34. Square insertion hole; 35. Circular plate; 36. Square protrusion; 37. Rocker arm; 38. Double-sided milled flat section; 39. Fixed support; 40. Fastening screw; 41. Lifting screw; 42. Tilt motor; 43. Tilt drive shaft; 100. Collective pitch angle adjustment assembly; 200. Tilt adjustment assembly; 300. Mounting base; 400. Main shaft tilt angle measurement platform; 500. Blade angle measurement platform. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0050] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as bolted connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can be found to achieve this function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a bolted connection can be chosen for detachable connections.

[0051] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0052] Example: Figures 1 to 14 As shown, the test device is the prior art, including collective pitch adjustment assembly 100 and tilt adjustment assembly 200. The collective pitch adjustment assembly 100 includes several blades 1, rotor main shaft 4, six-component balance 9, base 10, rotor motor 12, variable pitch push rod 13, bearing seat 15, torque sensor 18, crank 27 and variable pitch sliding sleeve 30.

[0053] The bearing housing 15, the six-component balance 9, and the base 10 are connected in sequence from top to bottom. The lower part of the rotor main shaft 4 is rotatably engaged with the bearing housing 15 through two main shaft bearings 24. The variable pitch push rod 13 is axially slidingly engaged with the upper part of the rotor main shaft 4, and the variable pitch push rod 13 is circumferentially limited to the upper part of the rotor main shaft 4. The lower end of the rotor main shaft 4 passes through the six-component balance 9 and is connected to one end of the torque sensor 18. The other end of the torque sensor 18 is connected to the output shaft of the rotor motor 12 through the commutator 11. The bearing housing 15 is provided with a lifting mechanism, and the output end of the lifting mechanism is connected to the variable pitch push rod 13.

[0054] The rotor hub is located at the top of the rotor main shaft 4. The rotor hub is composed of an upper rotor plate 2 and a lower rotor plate 3 connected vertically. The rotor hub has a pitch-changing cavity. The circumferential wall of the rotor hub has several connecting holes. The roots of several blades 1 are rotatably engaged with several of the connecting holes. The root end face of the blade 1 has a square insertion hole 33. The top of the pitch-changing push rod 13 is fitted with a pitch-changing box. The pitch-changing box is located in the pitch-changing cavity. Several openings are formed on the outer periphery of the pitch-changing box. The slide groove 32 has a variable pitch sleeve 30 slidably disposed therein. The crank 27 includes a central circular plate 34. A square protrusion 35 is provided on one side end face of the circular plate 34, and a rocker arm 36 is eccentrically disposed on the other side end face of the circular plate 34. The square protrusions 35 of several cranks 27 are inserted into and engaged with the square insertion holes 33 of several blades 1 in a corresponding manner. The rocker arm 36 of several cranks 27 is hinged to the variable pitch sleeve 30 in a corresponding manner. The slide groove 32 is perpendicular to the corresponding blade 1.

[0055] The pitch box includes an upper pitch box piece 29 and a lower pitch box piece 31 connected vertically. Several sliding grooves 32 are formed on the outer periphery of the lower pitch box piece 31 and extend upward through the lower pitch box piece 31. The upper pitch box piece 29 blocks the upper openings of the sliding grooves 32. The top of the pitch push rod 13 is provided with a double-sided milled flat section 37. The upper pitch box piece 29 and the lower pitch box piece 31 are sleeved on the double-sided milled flat section 37. The clamping ring 28 is connected to the top of the pitch push rod 13 and presses the upper pitch box piece 29 and the lower pitch box piece 31 onto the shoulder at the bottom of the double-sided milled flat section 37.

[0056] A speed encoder 16 is provided on the base 10, and the measuring ring of the speed encoder 16 is connected to the rotor main shaft 4.

[0057] The upper part of the rotor main shaft 4 is provided with an inner hole, and the variable pitch push rod 13 is slidably disposed in the inner hole of the rotor main shaft 4.

[0058] The lifting mechanism includes several electric cylinders 14 and an automatic tilter. The automatic tilter includes a stationary ring cover 6, a stationary ring 7, a moving ring 21, a moving ring cover 19, and a collective pitch adjusting bearing 20. The inner sidewall of the rotor shaft 4 has two through oblong holes, which are vertically oriented. The bottom of the variable pitch push rod 13 has a push rod pin 22. The stationary ring cover 6 and the stationary ring 7 are clamped on both sides of the outer ring of the collective pitch adjusting bearing 20. The moving ring 21 and the moving ring cover 19 are clamped on both sides of the inner ring of the collective pitch adjusting bearing 20. The moving ring 21 is sleeved on the rotor shaft 4. The two ends of the push rod pin 22 pass through the two oblong holes respectively and are connected to the moving ring 21. The push rod pin 22 slides with the two oblong holes respectively. The rear cylinder cover of the electric cylinder 14 is connected to the bearing seat 15. Several connecting ears are evenly arranged on the outer circumference of the stationary ring 7. The piston rods of the electric cylinders 14 are connected to the connecting ears one by one.

[0059] The drive motor of the electric cylinder 14 is named the blade angle drive motor. The blade angle drive motor drives the piston rod of the electric cylinder 14 to extend and retract, which in turn drives the automatic tilter to slide up and down, thereby adjusting the blade angle of each blade 1. The blade angle drive motor has its own encoder, and the rotor rotation angle of the blade angle drive motor can be identified and measured by the encoder. The rotor rotation angle has a one-to-one correspondence with the blade angle of each blade 1.

[0060] Two guide keys 5 are provided on the outer periphery of the rotor main shaft 4, and two keyways are vertically opened on the inner periphery of the moving ring 21. The two guide keys 5 slide in corresponding fit with the two keyways.

[0061] The bearing housing 15 and the stationary ring 7 are connected by the anti-torsion arm 8.

[0062] The tilt adjustment assembly 200 includes a fixed support 38 and a tilt motor 41. The left and right ends of the base 10 are rotatably mounted on the fixed support 38 via a tilt drive shaft 42 and a tilt driven shaft 43, respectively. The tilt motor 41 is mounted on the fixed support 38, and the output end of the tilt motor 41 is connected to the tilt drive shaft 42. A tilt sensor is mounted on the base 10.

[0063] A method for adjusting the collective pitch angle of a rotor test device includes the following steps:

[0064] Step 1: Fix and level the fixed support 38 of the test device;

[0065] Step 2: Adjust the tilt angle of the rotor main shaft 4 to a vertical position;

[0066] Step 3: Measure the blade angles of several blades 1 in real time;

[0067] Step 4: Establish random data consisting of the random rotor position and the arithmetic mean of the blade angles of the blade angle drive motor;

[0068] Step 5: Calculate the deviation between each blade angle in the random data and the arithmetic mean of the corresponding blade angles. If the deviation is greater than the error requirement, adjust the mechanism clearance and repeat Step 4.

[0069] Step 6: First, select the range of interpolated rotor positions from the random data according to the target collective pitch angle required for the experiment. Obtain the interpolated rotor position through difference calculation. Then, measure the interpolated blade angle of each blade 1 under the interpolated rotor position state and calculate the arithmetic mean of the interpolated blade angle.

[0070] Step 7: Calculate the deviation between the interpolated blade angle arithmetic mean and the target collective pitch angle. If the deviation is greater than the error requirement, take the interpolated rotor position and the corresponding interpolated blade angle arithmetic mean that are greater than the error requirement as new random data, and repeat Step 6 to obtain a new interpolated rotor position and a new interpolated blade angle arithmetic mean until the deviation between the final interpolated blade angle arithmetic mean and the target collective pitch angle meets the requirement. Take the final interpolated rotor position as the theoretical rotor position and record the corresponding data between the theoretical rotor position and the target collective pitch angle.

[0071] Step 8: Repeat steps 6 and 7 to obtain all the theoretical rotor positions and corresponding target collective pitch angle experimental relationship data required for the experiment;

[0072] Step 9: Select some typical data from all the experimental relationship data and test the repeatability deviation of the target total distance angle data. If the deviation exceeds the error requirement, adjust the mechanism clearance and repeat Step 4.

[0073] Step 10: After debugging, reinstall blade 1. Using the test relationship data obtained in step 8, the target collective pitch angle required for the test can be quickly obtained from the theoretical rotor position.

[0074] The specific method of step one is as follows: The four corners of the fixed support 38 of the test device are threaded with lifting screws 40, so that the fixed support 38 is supported on the mounting base 300 by the lifting screws 40. The fixed support 38 is leveled by turning each lifting screw 40. The plane of the fixed support 38 is measured with an angle measuring instrument until the levelness of the two vertical directions on the plane of the fixed support 38 meets the requirements. Then, the fixed support 38 and the mounting base 300 are tightened by fastening screws 39.

[0075] The specific method for step two is as follows: remove the upper blade 2 of the rotor hub, several blades 1, several cranks 27 and pitch box, install the main shaft tilt angle measuring platform 400 on the lower blade 3 of the rotor hub, place an angle measuring instrument on the main shaft tilt angle measuring platform 400, adjust the tilt angle of the rotor main shaft 4 by tilt motor 41, observe the reading of the angle measuring instrument until the rotor main shaft 4 is in a vertical state.

[0076] The specific method for step three is as follows: make a blade angle measuring platform 500 with connection conditions consistent with blade 1, disassemble the main shaft tilt angle measuring platform 400, reinstall the upper blade 2 of the blade hub, and use several blade angle measuring platforms 500 to replace several blades 1 and install them between the lower blade 3 and the upper blade 2 of the blade hub. An angle measuring instrument is placed on the blade angle measuring platform 500 to display the blade angle of the corresponding blade 1 in real time.

[0077] The specific method for step four is as follows: Within the required blade angle range for the experiment, arbitrarily select i blade angles to drive the rotor rotation angle of the motor as random rotor positions, and mark them sequentially as follows: , ... Measure the blade angle of each blade 1 under each random rotor position, calculate the arithmetic mean of the random blade angles corresponding to each random rotor position, and label them sequentially as follows: , ... The j-th random blade angle arithmetic mean is labeled as... Let j be any number in i, then Calculated using the following formula:

[0078] ;

[0079] In the formula:

[0080] n is the number of blades 1;

[0081] The blade angle measurement value of the nth blade 1 under the jth random rotor position;

[0082] The arithmetic mean of i random rotor positions and the corresponding i blade angles is used as random data. The blade angle measurement data must include the minimum and maximum blade angles required for the test conditions, so i is a natural number greater than or equal to 2.

[0083] The specific method for step five is as follows: In the j-th random rotor position state, the blade angle of the n-th blade 1... and corresponding arithmetic mean The deviation is ,like If the error exceeds the tolerance, adjust the clearance between blade 1, crank 27, and pitch sleeve 30. If it is less than the error index, then it is considered... Equal to the collective pitch angle of the blades under the corresponding random rotor position state .

[0084] The specific method for step six is ​​as follows: First, determine the target collective distance angle required for any experiment. The size is determined by selecting the arithmetic mean of two adjacent random rotor positions and their corresponding blade angles from the random data. The two selected random positions are defined as follows: and The arithmetic mean of the two blade angles are respectively and Assuming the target blade angle is the arithmetic mean It can be considered equal to Then make < < ,exist and Set interpolation rotor position between , The result is obtained through interpolation:

[0085] ;

[0086] Rotate the rotor of the blade angle drive motor to the interpolation rotor position. Measure the blade angle of each blade 1 at this time, and calculate the arithmetic mean of the interpolated blade angles. .

[0087] The specific method for step seven is as follows: If If it exceeds the error requirement, then Re-marked as ,Will Re-marked as Then and As new random data, repeat step six;

[0088] until If the error requirement is met, then... As the theoretical rotor position ,think It is the collective distance angle of the target. The corresponding rotor rotation angle position of the propeller angle drive motor.

[0089] In steps four through eight, when adjusting the blade angle, in order to avoid the influence of mechanical clearance, each blade 1 moves in one direction to change the blade angle.

[0090] In step two, when adjusting the tilt angle of the rotor main shaft 4, in order to avoid the influence of mechanical backlash, the rotor main shaft 4 is moved in one direction to change the tilt angle.

[0091] This invention eliminates the influence of installation and rotor shaft tilt on blade angle measurement by adjusting the fixed support 38 and the tilt angle of the rotor shaft 4. It solves the problem of being unable to measure the angle of blade 1 after installation by machining a blade angle measurement platform 500 parallel to the chord of the characteristic section of blade 1. Angle measurement platforms are installed at all blade positions, and the arithmetic average of the blade angles is used as the nominal collective pitch angle of the blades, effectively ensuring the consistency of blade angles and obtaining more accurate icing characteristics during high-speed blade rotation. The relationship between the blade collective pitch angle and the rotor position of the blade angle drive motor is non-linear; interpolation calculations quickly obtain the correspondence between the blade collective pitch angle and the theoretical rotor position of the blade angle drive motor, significantly shortening the debugging time. The blade collective pitch angle debugging method for rotor test devices proposed in this invention is beneficial for standardizing the debugging process of test devices that lack periodic pitch adjustment functionality and require unified adjustment of the collective pitch angle of each blade.

[0092] The above embodiments are merely illustrative examples of the present invention and do not limit its scope of protection. Those skilled in the art can make partial changes to them, as long as they do not exceed the spirit and essence of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A method for adjusting the collective pitch angle of a rotor test device, characterized in that, Includes the following steps: Step 1: Fix and level the fixed support (38) of the test device; Step 2: Adjust the tilt angle of the rotor main shaft (4) to a vertical position; Step 3: Measure the blade angle of several blades (1) in real time; Step 4: Establish random data consisting of the random rotor position and the arithmetic mean of the blade angles of the blade angle drive motor; Step 5: Calculate the deviation between each blade angle in the random data and the arithmetic mean of the corresponding blade angles. If the deviation is greater than the error requirement, adjust the mechanism clearance and repeat Step 4. Step 6: First, select the range of interpolated rotor positions from the random data according to the target collective pitch angle required for the experiment. Obtain the interpolated rotor position through difference calculation. Then, measure the interpolated blade angle of each blade (1) under the interpolated rotor position state and calculate the arithmetic mean of the interpolated blade angle. Step 7: Calculate the deviation between the interpolated blade angle arithmetic mean and the target collective pitch angle. If the deviation is greater than the error requirement, take the interpolated rotor position and the corresponding interpolated blade angle arithmetic mean that are greater than the error requirement as new random data, and repeat Step 6 to obtain a new interpolated rotor position and a new interpolated blade angle arithmetic mean until the deviation between the final interpolated blade angle arithmetic mean and the target collective pitch angle meets the requirement. Take the final interpolated rotor position as the theoretical rotor position and record the corresponding data between the theoretical rotor position and the target collective pitch angle. Step 8: Repeat steps 6 and 7 to obtain all the theoretical rotor positions and corresponding target collective pitch angle experimental relationship data required for the experiment; Step 9: Select some typical data from all the experimental relationship data and test the repeatability deviation of the target total distance angle data. If the deviation exceeds the error requirement, adjust the mechanism clearance and repeat Step 4. Step 10: After debugging, reinstall the blades (1). Using the test relationship data obtained in step 8, the target collective pitch angle required for the test can be quickly obtained from the theoretical rotor position.

2. The method for adjusting the collective pitch angle of a rotor test device according to claim 1, characterized in that, The specific method of step one is as follows: the fixed support (38) of the test device is threaded with lifting screws (40) at all four corners, so that the fixed support (38) is supported on the mounting base (300) by the lifting screws (40). The fixed support (38) is leveled by turning each lifting screw (40). The plane of the fixed support (38) is measured by an angle measuring instrument until the levelness of the two vertical directions on the plane of the fixed support (38) meets the requirements. Then the fixed support (38) and the mounting base (300) are tightened by fastening screws (39).

3. The method for adjusting the collective pitch angle of a rotor test device according to claim 2, characterized in that, The specific method of step two is as follows: remove the upper blade (2), several blades (1), several cranks (27) and pitch box of the rotor hub, install the main shaft tilt angle measuring platform (400) on the lower blade (3) of the rotor hub, place an angle measuring instrument on the main shaft tilt angle measuring platform (400), adjust the tilt angle of the rotor main shaft (4) by tilt motor (41), observe the reading of the angle measuring instrument until the rotor main shaft (4) is in a vertical state.

4. The method for adjusting the collective pitch angle of a rotor test device according to claim 3, characterized in that, The specific method of step three is as follows: make a blade angle measurement platform (500) with the same connection conditions as the blade (1), disassemble the main shaft tilt angle measurement platform (400), reinstall the upper blade of the blade hub (2), and use several blade angle measurement platforms (500) to replace several blades (1) and install them between the lower blade of the blade hub (3) and the upper blade of the blade hub (2). An angle measuring instrument is placed on the blade angle measurement platform (500) to display the blade angle of the corresponding blade (1) in real time.

5. The method for adjusting the collective pitch angle of a rotor test device according to claim 1, characterized in that, The specific method for step four is as follows: Within the required blade angle range for the experiment, arbitrarily select i blade angles to drive the rotor rotation angle of the motor as random rotor positions, and mark them sequentially as follows: , ... Measure the blade angle of each blade (1) under each random rotor position, calculate the arithmetic mean of the random blade angles corresponding to each random rotor position, and label them sequentially as follows: , ... The j-th random blade angle arithmetic mean is labeled as... Let j be any number in i, then Calculated using the following formula: ； In the formula: n is the number of blades (1); The blade angle measurement value of the nth blade (1) under the jth random rotor position; The arithmetic mean of i random rotor positions and the corresponding i blade angles is used as random data, where i is a natural number greater than or equal to 2.

6. The method for adjusting the collective pitch angle of a rotor test device according to claim 5, characterized in that, The specific method for step five is as follows: the blade angle of the nth blade (1) under the j-th random rotor position state. and corresponding arithmetic mean The deviation is ,like If the error exceeds the tolerance, adjust the clearance between the blade (1), crank (27), and pitch sleeve (30). If it is less than the error index, then it is considered... Equal to the collective pitch angle of the blades under the corresponding random rotor position state .

7. The method for adjusting the collective pitch angle of a rotor test device according to claim 6, characterized in that, The specific method for step six is ​​as follows: First, determine the target collective distance angle required for any experiment. The size is determined by selecting the arithmetic mean of two adjacent random rotor positions and their corresponding blade angles from the random data. The two selected random positions are defined as follows: and The arithmetic mean of the two blade angles are respectively and Assuming the target blade angle is the arithmetic mean It can be considered equal to Then make < < ,exist and Set interpolation rotor position between , The result is obtained through interpolation: ； Rotate the rotor of the blade angle drive motor to the interpolation rotor position. Measure the blade angle of each blade (1) at this time, and calculate the arithmetic mean of the interpolated blade angle. .

8. The method for adjusting the collective pitch angle of a rotor test device according to claim 7, characterized in that, The specific method for step seven is as follows: If If it exceeds the error requirement, then Re-marked as ,Will Re-marked as Then and As new random data, repeat step six; until If the error requirement is met, then... As the theoretical rotor position ,think It is the collective distance angle of the target. The corresponding rotor rotation angle position of the propeller angle drive motor.

9. A method for adjusting the collective pitch angle of a rotor test device according to claim 8, characterized in that, In steps four through eight, when adjusting the blade angle, in order to avoid the influence of mechanical clearance, each blade (1) moves in one direction to change the blade angle.

10. The method for adjusting the collective pitch angle of a rotor test device according to claim 3, characterized in that, In step two, when adjusting the tilt angle of the rotor main shaft (4), in order to avoid the influence of mechanical clearance, the rotor main shaft (4) is moved in one direction to change the tilt angle.

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