A rotor measurement device

Abstract

An embodiment of the present invention provides a rotor measurement device, which includes: a rotor fixing assembly and an external load loading assembly; the rotor fixing assembly includes a rotor fixing bracket and a connecting plate, and the connecting plate is rotatably connected to the fixing bracket; the external load loading assembly includes an external load loading bracket, a clamping block, a first fixed pulley and a second fixed pulley arranged on the top of the external load loading bracket, a first rope wound around the first fixed pulley, a second rope wound around the second fixed pulley, a first loading machine and a second loading machine; one end of the first rope is fixedly connected to the first loading machine, and the other end is fixedly connected to the clamping block; one end of the second rope is fixedly connected to the second loading machine, and the other end is fixedly connected to the clamping block, and the connection positions of the first rope and the second rope with the clamping block are different. When using the rotor measurement device of the present invention to measure the rotor, the number of measurement devices required for measuring the rotor and the measurement time can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of helicopters, and particularly to a rotor measuring device. Background Art

[0002] The helicopter rotor is a key component of a helicopter. The stiffness of the helicopter rotor has a great influence on the vibration, reliability, safety, speed, and maneuverability of the helicopter. Therefore, the stiffness measurement of each cross-section of the helicopter rotor is one of the key experiments of the helicopter. The cross-section stiffness of the helicopter rotor mainly includes flapping stiffness, lag stiffness, and torsional stiffness.

[0003] When measuring the stiffness of each cross-section of the rotor using the existing rotor measuring device, it is necessary to use a flapping stiffness measuring device, a lag stiffness measuring device, and a torsional stiffness measuring device respectively to measure the flapping stiffness, lag stiffness, and torsional stiffness of the rotor.

[0004] Since the existing rotor measuring device can only achieve the measurement of one kind of stiffness, if you want to measure the three cross-section stiffnesses of the rotor, you need to conduct experiments on three different devices respectively. This not only requires a large number of devices for measurement, but also takes a long time for measurement. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide a rotor measuring device to reduce the number of measuring devices and the measurement time required when measuring the rotor. The specific technical solutions are as follows:

[0006] The embodiments of the present invention provide a rotor measuring device, which includes: a rotor fixing component and an external load loading component;

[0007] The rotor fixing component includes a rotor fixing bracket and a connecting plate, and the connecting plate is rotatably connected to the fixing bracket;

[0008] The external load loading component includes an external load loading bracket, a clamping block, a first fixed pulley and a second fixed pulley arranged on the top of the external load loading bracket, a first rope wound around the first fixed pulley, a second rope wound around the second fixed pulley, a first loading machine and a second loading machine;

[0009] One end of the first rope is fixedly connected to the first loading machine, and the other end is fixedly connected to the clamping block; one end of the second rope is fixedly connected to the second loading machine, and the other end is fixedly connected to the clamping block. The connection positions of the first rope and the second rope with the clamping block are different.

[0010] Optionally, the device further includes a central shaft; a central shaft hole is provided on the rotor fixing bracket; one end of the central shaft is fixedly connected to the connecting plate, and the other end extends into the central shaft hole; the diameter of the central shaft hole is greater than the diameter of the part of the central shaft extending into the central shaft hole.

[0011] Optionally, a rotor insertion hole is provided on the clamping block; the connection positions of the first rope and the second rope with the clamping block are respectively located on both sides of the rotor insertion hole.

[0012] Optionally, the rotor fixing assembly further includes a locking chuck; the central shaft hole is a through hole; one end of the central shaft is fixedly connected to the connecting plate, and after passing through the central shaft hole, the other end is fixedly connected to the locking chuck.

[0013] Optionally, the connecting plate includes a rotor connecting plate and a connecting seat fixedly connected perpendicular to the rotor connecting plate; a through hole is opened on the rotor connecting plate; one end of the central shaft is fixedly connected to the connecting seat.

[0014] Optionally, the rotor fixing assembly further includes a mounting chassis, a central through hole is opened on the mounting chassis, one end of the central shaft is fixedly connected to the connecting plate, and after passing through the central through hole, the other end extends into the central shaft hole.

[0015] Optionally, the rotor fixing bracket includes a main bracket and a central shaft connecting plate fixedly connected to the main bracket; the central shaft hole is provided on the central shaft connecting plate.

[0016] Optionally, the external load loading assembly further includes a roller and a third rope wound around the roller; one end of the first rope is fixedly connected to the first loading machine, and the other end is fixedly connected to the roller; both ends of the third rope are respectively fixedly connected to both sides of the rotor insertion hole on the clamping block.

[0017] Optionally, the external load loading assembly further includes a third fixed pulley and a fourth fixed pulley provided at the top of the external load loading bracket; the first rope is sequentially wound around the first fixed pulley and the third fixed pulley; the second rope is sequentially wound around the second fixed pulley and the fourth fixed pulley.

[0018] Optionally, the external load loading assembly further includes at least two pulley brackets, the cross section of the pulley bracket is semi-frame-shaped; the at least two pulley brackets are respectively fixedly connected to the first fixed pulley and the second fixed pulley, and the pulley bracket is slidably connected to the cross beam at the top of the external load loading bracket.

[0019] Optionally, the device further includes a central shaft and a mounting chassis; a central shaft hole is provided on the rotor fixing bracket;

[0020] The central axis includes a circular shaft end baffle and a shaft body; the mounting chassis is provided with a central through hole, and the central through hole is a counterbore; the shaft body of the central axis passes through the central through hole and extends into the central axis hole, and the shaft end baffle is arranged in the counterbore of the central through hole; the outer diameter of the shaft end baffle is smaller than the diameter of the counterbore part of the central through hole, and the outer diameter of the shaft end baffle is larger than the diameter of the straight hole part of the central through hole; the mounting chassis is fixedly connected with the connecting plate; the diameter of the central axis hole is larger than the diameter of the part of the shaft of the central axis extending into the central axis hole.

[0021] The rotor measurement device provided by the embodiment of the present invention includes a rotor fixing assembly and an external load loading assembly; the rotor fixing assembly includes a rotor fixing bracket and a connecting plate; the connecting plate is rotatably connected with the fixing bracket; the external load loading assembly includes an external load loading bracket, a clamping block, a first fixed pulley and a second fixed pulley arranged at the top of the external load loading bracket, a first rope wound around the first fixed pulley, a second rope wound around the second fixed pulley, a first loading machine and a second loading machine; one end of the first rope is fixedly connected with the first loading machine, and the other end is fixedly connected with the clamping block; one end of the second rope is fixedly connected with the second loading machine, and the other end is fixedly connected with the clamping block, and the connection positions of the first rope and the second rope with the clamping block are different.

[0022] When using the rotor measurement device of the present invention to measure the rotor, the tail of the rotor is fixed between the connection positions of the first rope and the second rope on the clamping block, and the root is fixed on the connecting plate. By respectively controlling the magnitudes of the forces applied by the first loading machine and the second loading machine, the rotor can be rotated at any angle, and at the same time, the rotor is subjected to flapping force, waving force and torsional force. According to the magnitudes of the output forces of the first loading machine and the second loading machine and the deformation of the rotor, the flapping stiffness, flutter stiffness and torsional stiffness of the rotor can be obtained respectively, without the need to measure on other measuring devices, thereby reducing the number of measuring devices required for measuring the rotor and the measurement time. Of course, it is not necessary for any product or method implementing the present invention to achieve all the above-mentioned advantages at the same time. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of a rotor measurement device provided by an embodiment of the present invention;

[0025] Figure 2Schematic diagram of the structure of the rotor fixing assembly according to an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the structure of the external load loading assembly according to an embodiment of the present invention;

[0027] Figure 4 Schematic diagram for measuring the flapping stiffness according to an embodiment of the present invention. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In order to reduce the number of measuring devices required for measuring the rotor and the measurement time, an embodiment of the present invention provides a rotor measuring device, and the rotor measuring device provided by the embodiment of the present invention will be introduced below.

[0030] It should be noted that a rotor measuring device provided by an embodiment of the present invention can be used for measuring the stiffness of a helicopter rotor.

[0031] As Figure 1 shown, an embodiment of the present invention provides a rotor measuring device, which is characterized in that the device includes: a rotor fixing assembly 1 and an external load loading assembly 2.

[0032] The rotor fixing assembly 1 includes a rotor fixing bracket 110 and a connecting plate 120, and the connecting plate 120 is rotatably connected to the fixing bracket 110.

[0033] The external load loading assembly 2 includes an external load loading bracket 210, a clamping block 220, a first fixed pulley 230 and a second fixed pulley 240 arranged on the top of the external load loading bracket 210, a first rope 250 wound around the first fixed pulley 230, a second rope 260 wound around the second fixed pulley 240, a first loading machine 270 and a second loading machine 280.

[0034] One end of the first rope 250 is fixedly connected to the first loading machine 270, and the other end is fixedly connected to the clamping block 220; one end of the second rope 260 is fixedly connected to the second loading machine 280, and the other end is fixedly connected to the clamping block 220, and the connection positions of the first rope 250 and the second rope 260 with the clamping block 220 are different.

[0035] When measuring a helicopter rotor using the rotor measuring device provided by the embodiment of the present invention, the root of the rotor 3 can be fixedly connected to the connecting plate 120, and the tail is fixed to the clamping block 220. The rotor fixing assembly 1 and the external load loading assembly 2 are placed relatively parallel. Since the connecting plate 120 is rotatably connected to the fixing bracket 110, the rotor 3 can also rotate relative to the rotor fixing bracket 110. By applying forces to different positions of the clamping block 220 through the first loading machine 270 and the second loading machine 280, the rotor 3 rotates to different degrees along with the clamping block 220. When the first loading machine 270 and the second loading machine 280 apply a certain force to the clamping plate 220, the rotor 3 can be simultaneously subjected to the action of flapping force, lag force and torsion force according to the different heights and inclination angles of the clamping plate 220. By reading the magnitudes of the forces applied by the above two loading machines and measuring the deformation of the rotor, the lag stiffness, flapping stiffness and torsion stiffness of the rotor can be calculated. Thus, the number of measuring devices required for measuring the rotor and the measuring time are reduced.

[0036] In an implementation manner of the embodiment of the present invention, the above-mentioned rotor fixing assembly 1 and external load loading assembly 2 can be two separate components without a connection relationship, or can be two connected components. For the convenience of handling, storing and pose adjustment during measurement of the device, in the embodiment of the present invention, it is preferably set that the rotor fixing assembly 1 and the external load loading assembly 2 are two separate components without a connection relationship.

[0037] It can be understood that shaft connection can conveniently realize the rotational connection of two components, and the shaft connection has the characteristics of stable connection and reliable rotation. Therefore, in an implementation manner of the embodiment of the present invention, to realize the rotational connection between the connecting plate 120 and the fixing bracket 110, as Figure 2 shown, the above-mentioned device may further include a middle shaft 130; a middle shaft hole 111 is provided on the above-mentioned rotor fixing bracket 110; one end of the middle shaft 130 is fixedly connected to the connecting plate 120, and the other end extends into the middle shaft hole 111; the diameter of the middle shaft hole 111 is larger than the diameter of the part of the middle shaft 130 extending into the middle shaft hole 111.

[0038] After connecting the connecting plate 120 and the fixing bracket 110 with the middle shaft 130, the middle shaft can rotate in the middle shaft hole 111 of the fixing bracket 110, so that after the rotor 3 is fixed on the connecting plate 120, it can also rotate relative to the fixing bracket 110, and the connection with the shaft is highly reliable, so that the connection reliability between the rotor 3 and the rotor fixing assembly 1 is also relatively high.

[0039] For the convenience of connecting the rotor 3 and the clamping block 220, in an implementation manner of the embodiment of the present invention, as Figure 3As shown, rotor insertion holes 221 can be provided on the clamping block 220; the connection positions of the first rope 250 and the second rope 260 with the clamping block 220 are respectively located on both sides of the rotor insertion hole 221.

[0040] After the rotor insertion holes 221 are provided on the clamping block 220, the tail of the rotor 3 can be inserted into the rotor insertion holes 221, so that the installation during rotor measurement is very convenient, and the measurement speed and efficiency are improved.

[0041] In practical applications, when the central shaft 130 passes through the central shaft hole 111, the shaft end of the central shaft 130 may fall off from the central shaft hole 111. Therefore, in order to prevent the shaft end of the central shaft 130 from falling off from the central shaft hole 111, in an implementation manner of the embodiment of the present invention, as Figure 2 shown, the rotor fixing assembly 1 may further include a locking chuck 140; the central shaft hole 111 is a through hole; one end of the central shaft 130 is fixedly connected to the connecting plate 120, and the other end passes through the central shaft hole 111 and is fixedly connected to the locking chuck 140.

[0042] The locking chuck 140 is a component commonly used in the mechanical field for clamping and positioning workpieces. Those skilled in the art can select a suitable locking chuck 140 according to the actual situation, and the present application does not limit the specific structure of the locking chuck 140.

[0043] When the locking chuck 140 is provided at the shaft end of the central shaft 130, the locking chuck 140 can stably position the central shaft 130, preventing the shaft end of the central shaft 130 from falling off from the central shaft hole 111, thereby improving the reliability and stability of the rotor measuring device during the measurement process.

[0044] It can be understood that generally, connection holes for connecting with the helicopter main body are provided at the root of the helicopter rotor 3. Therefore, in order to facilitate the connection between the root of the rotor 3 and the measuring device of the present application, in an implementation manner of the embodiment of the present invention, as Figure 2 shown, the connecting plate 120 may include a rotor connecting plate 121 and a connecting seat 122 fixedly connected perpendicularly to the rotor connecting plate 121; through holes are provided on the rotor connecting plate 121; one end of the central shaft 130 is fixedly connected to the connecting seat 122.

[0045] During rotor measurement, the connection hole at the root of the rotor 3 and the through hole on the rotor connecting plate 121 can be connected with connecting components such as bolts, screws or pins. When measuring the rotor 3, the rotor 3 can be conveniently installed and disassembled, improving the measurement efficiency.

[0046] It can be understood that after the rotor 3 is installed on the above-mentioned measuring device, when the self-weight of the rotor 3 itself is relatively large, the requirement for the structural strength of the above-mentioned measuring device will be relatively high. Therefore, in an implementation manner of the embodiment of the present invention, the rotor fixing assembly 1 may further include a mounting chassis 150. The mounting chassis 150 is provided with a central through hole 151. One end of the central shaft 130 is fixedly connected to the connecting plate 120, and the other end passes through the central through hole 151 and extends into the central shaft hole 111. The connecting plate 120 is fixedly connected to the mounting chassis 150.

[0047] After adding the mounting chassis 150, since the central shaft 130 can be supported on the mounting chassis after passing through the central through hole 151, the possibility of deformation or fracture of the central shaft 130 due to overload is reduced. At the same time, the mounting chassis 150 is fixedly connected to the connecting plate 120, which can also improve the strength of the connecting plate 120, thereby improving the accuracy and reliability of the rotor measuring device during measurement.

[0048] During the measurement process, the rotation of the central shaft 130 in the central shaft hole 111 may damage the entire rotor fixing bracket 110, thereby affecting the structural strength of the rotor fixing bracket 110. To optimize the structure of the rotor measuring device and reduce the damage to the rotor fixing bracket 110 during measurement, in an implementation manner of the embodiment of the present invention, the rotor fixing bracket 110 may include a main bracket 112 and a central shaft connecting plate 113 fixedly connected to the main bracket 112; the central shaft hole 111 is provided on the central shaft connecting plate 113.

[0049] Since the central shaft 130 rotates in the central shaft hole 111 on the central shaft connecting plate 113, the damage to the central shaft hole 111 will only affect the structural performance of the central shaft connecting plate 113 and will not affect the structural performance of the main bracket 112, thereby reducing the impact of the damage to the central shaft hole 111 on the rotor fixing bracket 110 and improving the reliability of the above device. In addition, when the central shaft connecting plate 113 is damaged, only the central shaft connecting plate 113 can be replaced, thereby simplifying the maintenance process and maintenance cost of the rotor measuring device.

[0050] It can be understood that if both the first loading machine and the second loading machine adjust the height and tilt angle of the chuck 220 at the same time, then when calculating the strength of the rotor 3 using the loading force displayed by the loading machine, multiple steps of force analysis are required. Therefore, in an implementation manner of the embodiment of the present invention, to further simplify the complexity of the calculation process, such as Figure 3As shown, the external load loading component 2 may further include a roller 290 and a third rope 2100 wound around the roller 290; one end of the first rope 250 is fixedly connected to the first loading machine 270, and the other end is fixedly connected to the roller 290; both ends of the third rope 2100 are respectively fixedly connected to both sides of the rotor insertion hole 221 on the clamping block 220.

[0051] After both ends of the rope 2100 are respectively fixedly connected to both sides of the rotor insertion hole 221 on the clamping block 220, the adjustment of the height of the clamping block 220 can be completed only by using the first loading machine 270, and the adjustment of the tilt angle of the clamping block 220 can be completed only by using the second loading machine 280. Since the forces in different directions received by the clamping block can be directly obtained from the loading machines, the strength of the rotor 3 can be calculated more intuitively and simply by using the magnitudes of the loading forces of different loading machines.

[0052] It can be understood that when a rope is wound around a fixed pulley, due to the limitation of the diameter of the fixed pulley, the components connected to both ends of the rope wound around the fixed pulley may interfere with each other, affecting the measurement accuracy. Therefore, in an implementation manner of the embodiment of the present invention, the external load loading component 2 may further include a third fixed pulley 2110 and a fourth fixed pulley 2120 provided at the top of the external load loading bracket 210; the first rope 250 is sequentially wound around the first fixed pulley 230 and the third fixed pulley 2110; the second rope 260 is sequentially wound around the second fixed pulley 240 and the fourth fixed pulley 2120, and the above four fixed pulleys are arranged collinearly.

[0053] After adding the third fixed pulley 2110 and the fourth fixed pulley 2120, the components connected to both ends of the rope wound around the fixed pulley can be kept at a relatively large reasonable distance, thereby avoiding the interference of the components connected to both ends of the rope and improving the measurement accuracy.

[0054] To flexibly adjust the attitude of the rotor 3 after installation, in an implementation manner of the embodiment of the present invention, the external load loading component 2 may further include at least two pulley brackets 2130, and the cross-section of the pulley bracket 2130 is semi-frame-shaped; the at least two pulley brackets 2130 are respectively fixedly connected to the first fixed pulley 230 and the second fixed pulley 240, and the pulley bracket 2130 is slidably connected to the cross beam 211 at the top of the external load loading bracket 210.

[0055] When the fixed pulley is installed on the external load loading bracket 210 through the pulley bracket 2130, the position of the clamping block 220 can be flexibly adjusted by sliding the pulley bracket 2130, so as to flexibly adjust the position of the rotor 3, thereby simplifying the adjustment operation in the measurement process of the rotor 3.

[0056] For the convenience of reading the loading force and simplifying the stiffness calculation after measurement, in an implementation manner of the embodiment of the present invention, when measuring the stiffness of the rotor 3, after the rotor 3 is installed in the above-mentioned measuring device, a third loading machine 2140 can also be hung on the part of the rotor 3 extending out of the rotor insertion hole 221 at the tail of the rotor 3. Among them, the above-mentioned first loading machine 270 and the second loading machine 280 level the position of the rotor 3, and the third loading machine 2140 is used to apply a flapping force to the rotor 3, and the torsional force is still applied jointly by the first loading machine and the second loading machine.

[0057] After the third loading machine 2140 is arranged at the tail of the rotor 3, when measuring the flapping stiffness of the rotor 3, the rotor 3 can be placed in a horizontal posture, and the third loading machine 2140 applies a force to the tail of the rotor 3, and the flapping stiffness of the rotor 3 can be calculated by the magnitude of the output force of the third loading machine 2140; when measuring the lead-lag stiffness of the rotor 3, the rotor 3 can be placed in a vertical posture, and the third loading machine 2140 applies a force to the tail of the rotor 3, and the lead-lag stiffness of the rotor 3 can be calculated by the magnitude of the output force of the third loading machine 2140. Thus, the stiffness calculation can be directly carried out from the magnitude of the output force obtained by the third loading machine 2140, without having to calculate the flapping force or lead-lag force received by the rotor 3 after performing a force analysis based on the output forces of the first loading machine 270 and the second loading machine 280, and then performing the stiffness calculation. The stiffness calculation process is simplified, the error rate in the calculation process is reduced, the speed of obtaining the measurement result is increased, and thus the efficiency of rotor measurement is improved.

[0058] It can be understood that the electric loading machine has characteristics such as high controllability and small structural volume. Therefore, in an implementation manner of the embodiment of the present invention, the first loading machine 270 and the second loading machine 280 can both be electric loading machines, thereby simplifying the structure of the rotor measuring device and being able to more accurately control the loading force during rotor measurement, improving the accuracy of rotor measurement.

[0059] For the convenience of device disassembly, in an implementation manner of the embodiment of the present invention, the above-mentioned device further includes a central shaft 130 and a mounting chassis 150; a central shaft hole 111 is provided on the rotor fixing bracket 110;

[0060] The central shaft 130 includes a circular shaft end baffle 131 and a shaft body 132; the mounting chassis 150 is provided with a central through hole 151, and the central through hole 151 is a countersunk hole; the shaft body 132 of the central shaft 130 passes through the central through hole 151 and extends into the central shaft hole 111, and the shaft end baffle 131 is arranged in the countersunk head of the central through hole 151; the outer diameter of the shaft end baffle 131 is smaller than the diameter of the countersunk part of the central through hole 151, and the outer diameter of the shaft end baffle 131 is larger than the diameter of the straight hole part of the central through hole 151; the mounting chassis 150 is fixedly connected with the connecting plate 120; the diameter of the central shaft hole 111 is larger than the diameter of the part of the shaft of the central shaft 130 extending into the central shaft hole 111. In practical applications, the mounting chassis 150 and the connecting plate 120 can be fixedly connected by bolts.

[0061] When the central shaft 130 is connected through the mounting chassis 150 and the connecting plate 120, it is more convenient for the installation and disassembly of the central shaft 130, thus making the replacement of the parts of the device more convenient.

[0062] When using the measuring device provided by the embodiment of the present invention to measure the stiffness, the attitude of the rotor 3 fixed on the connecting plate 120 relative to the rotor fixing bracket 110 can be adjusted by rotating the connecting plate 120, so as to realize the measurement of different stiffnesses.

[0063] When measuring the flapping stiffness of the rotor 3, the rotor 3 is placed in a horizontal attitude by rotating the connecting plate 120, and the flapping stiffness of the rotor can be measured in the following way: as Figure 4 shown, a certain number of strain gauges are pasted on the section to be measured, and a certain load F is applied by a third loading machine 2140 at a specific section z1 , and the distance between the loading section and the specific section is defined as D1. Under the action of F z1 , the strain values of each strain gauge are respectively defined as ε1, ε2, …, ε n , where the distance from the i-th strain gauge to the horizontal plane of the section of the rotor 3 is z i .

[0064] According to the formula of material mechanics, the flapping stiffness of the rotor 3 at the section to be measured is:

[0065]

[0066] When measuring the lead-lag stiffness of the rotor 3, after the rotor 3 is placed in a vertical attitude by rotating the connecting plate 120, using the same measurement method as the flapping stiffness, the lead-lag stiffness of the rotor 3 at the section to be measured can be measured as:

[0067]

[0068] The measurement of the torsional stiffness GJ is the data obtained for the relative torsional angle of a section of the blade, referring to the average torsional stiffness of this section of the blade.

[0069] When measuring the torsional stiffness of the rotor 3, the rotor 3 is placed in a horizontal attitude by rotating the connecting plate 120. The first loading machine 270 and the second loading machine 280 apply forces of a certain magnitude respectively, causing the rotor 3 to twist by a certain angle. The torsional stiffness of the rotor 3 can be measured in the following way:

[0070] Select a section of the rotor 3 with a length of l formed by section A and section B of the rotor 3. Four displacement sensors are respectively arranged at the leading edge and trailing edge points of section A and section B of the rotor 3. The four displacement sensors measure the torsional angles α1 and α2 of each section. Then the torsional angle of this section of the blade is Δα = |α1 - α2|. According to the mechanics of materials, the torsional stiffness of the rotor 3 can be obtained as:

[0071]

[0072] Among them, d1 and d2 are the rotational displacements of the leading edge and trailing edge of section A measured by the displacement sensors; d3 and d4 are the rotational displacements of the leading edge and trailing edge of section B measured by the displacement sensors, and M tor is the torque applied to the rotor, and this torque can be calculated from the loading forces of the first loading machine 270 and the second loading machine 280. c is the chord length of the rotor section.

[0073] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0074] Each embodiment in this specification is described in a related manner. The same or similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are all included in the protection scope of the present invention.

Claims

1. A rotor measurement device, characterized in that, Comprising: A rotor fixing assembly (1) and an external load loading assembly (2); The rotor fixing assembly (1) includes a rotor fixing bracket (110) and a connecting plate (120), and the connecting plate (120) is rotatably connected to the fixing bracket (110); The external load loading assembly (2) includes an external load loading bracket (210), a clamping block (220), a first fixed pulley (230) and a second fixed pulley (240) arranged at the top of the external load loading bracket (210), a first rope (250) wound around the first fixed pulley (230), a second rope (260) wound around the second fixed pulley (240), a first loading machine (270) and a second loading machine (280); One end of the first rope (250) is fixedly connected to the first loading machine (270), and the other end is fixedly connected to the clamping block (220); one end of the second rope (260) is fixedly connected to the second loading machine (280), and the other end is fixedly connected to the clamping block (220). The connection positions of the first rope (250) and the second rope (260) with the clamping block (220) are different. By applying forces to different positions of the clamping block (220) through the first loading machine (270) and the second loading machine (280), the measured rotor (3) rotates to different degrees along with the clamping block (220). With the different heights and inclination angles of the clamping block (220), the measured rotor (3) can be simultaneously subjected to flapping force, lag force and torsional force; The device further includes a central shaft (130); a central shaft hole (111) is provided on the rotor fixing bracket (110); one end of the central shaft (130) is fixedly connected to the connecting plate (120), and the other end extends into the central shaft hole (111); the diameter of the central shaft hole (111) is larger than the diameter of the part of the central shaft (130) extending into the central shaft hole (111); A rotor insertion hole (221) is provided on the clamping block (220); the connection positions of the first rope (250) and the second rope (260) with the clamping block (220) are respectively located on both sides of the rotor insertion hole (221).

2. The device according to claim 1, characterized in that The rotor fixing assembly (1) further includes a locking chuck (140); the central shaft hole (111) is a through hole; one end of the central shaft (130) is fixedly connected to the connecting plate (120), and after passing through the central shaft hole (111), the other end is fixedly connected to the locking chuck (140).

3. The device according to claim 1, characterized in that, The connecting plate (120) includes a rotor connecting plate (121) and a connecting seat (122) fixedly connected perpendicular to the rotor connecting plate (121); through holes are provided on the rotor connecting plate (121); one end of the central shaft (130) is fixedly connected to the connecting seat (122).

4. The device according to claim 1, characterized in that The rotor fixing assembly (1) further includes a mounting chassis (150). The mounting chassis (150) is provided with a central through hole (151). One end of the central shaft (130) is fixedly connected to the connecting plate (120), and the other end passes through the central through hole (151) and extends into the central shaft hole (111).

5. The device according to claim 1, characterized in that The rotor fixing bracket (110) includes a main bracket (112) and a central shaft connecting plate (113) fixedly connected to the main bracket (112). The central shaft hole (111) is provided on the central shaft connecting plate (113).

6. The device according to claim 1, characterized in that The external load loading assembly (2) further includes a roller (290) and a third rope (2100) wound around the roller (290). One end of the first rope (250) is fixedly connected to the first loading machine (270), and the other end is fixedly connected to the roller (290). The two ends of the third rope (2100) are respectively fixedly connected to both sides of the rotor insertion hole (221) on the clamping block (220).

7. The device according to claim 1, characterized in that, The external load loading assembly (2) further includes a third fixed pulley (2110) and a fourth fixed pulley (2120) provided at the top of the external load loading bracket (210). The first rope (250) is successively wound around the first fixed pulley (230) and the third fixed pulley (2110). The second rope (260) is successively wound around the second fixed pulley (240) and the fourth fixed pulley (2120).

8. The device according to claim 1, characterized in that, The device further includes a central shaft (130) and a mounting chassis (150). A central shaft hole (111) is provided on the rotor fixing bracket (110). The central shaft (130) includes a circular shaft end baffle (131) and a shaft body (132). The mounting chassis (150) is provided with a central through hole (151), and the central through hole (151) is a countersunk hole. The shaft body (132) of the central shaft (130) passes through the central through hole (151) and extends into the central shaft hole (111). The shaft end baffle (131) is arranged in the countersink of the central through hole (151). The outer diameter of the shaft end baffle (131) is smaller than the diameter of the countersink part of the central through hole (151), and the outer diameter of the shaft end baffle (131) is larger than the diameter of the straight hole part of the central through hole (151). The mounting chassis (150) is fixedly connected to the connecting plate (120). The diameter of the central shaft hole (111) is larger than the diameter of the part of the shaft of the central shaft (130) extending into the central shaft hole (111).

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