Rigid rotor rotation working mode identification device based on equiphase acquisition

Abstract

The invention provides a rigid rotor rotation working mode identification device based on equiphase acquisition. The rigid rotor rotation working mode identification device comprises rotation telemetering acquisition equipment (1), a rotor hub central part (2), a rigid rotor (4), an equiphase data acquisition assembly (5), a conical support assembly (6) and a computer, through the rigid rotor rotation working mode identification device based on equiphase acquisition, random interference in a test process can be effectively reduced under multiple average under the condition that the acquired rigid rotor load data is in a same phase angle state under each rotation circle number in a rigid rotor rotation process, and the test efficiency is improved. And the identification precision and effectiveness of the rotation working mode of the rigid rotor wing are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rotor test, and particularly relates to a rigid rotor rotating working mode identification device based on equal-phase acquisition. BACKGROUND

[0002] The inherent frequency of a rigid rotor in a rotating state is the basis for the dynamic design of the rigid rotor. The aerodynamic and structural coupling of the rigid rotor is more complex than that of a conventional rotor, making it very difficult to accurately analyze the dynamic performance of the rotor system. In addition, the differences between materials, manufacturing processes and theoretical design also affect the accuracy of theoretical analysis.

[0003] In this case, the rotating rotor dynamics test becomes the final basis for verifying the dynamic design of the rotor. The existing dynamic test method of the rotor in a rotating state is as follows: Strain gauges are arranged on the rotor, and the acquisition is performed at a preset sampling frequency. Then, the acquired data is divided into rings according to the rotating speed of the rotor, and the data is analyzed to obtain the working mode of the rotor in a rotating operating state. However, the actual rotating speed of the rotor fluctuates greatly, which seriously affects the division of the acquired data and further affects the identification of the working mode. SUMMARY

[0004] The application provides a rigid rotor rotating working mode identification device based on equal-phase acquisition. Through the matching design of the mass stiffness of the test bed, the inherent frequency of the device itself is improved and the composition is single, effectively reducing the interference of the test bed on the modal identification of the rigid rotor. Through the external clock rotating trigger device of the photoelectric sensor and the code disc, equal-phase data synchronous acquisition under different rotating speeds and different numbers of rings is realized, so that the rotating working mode identification of the rigid rotor is realized.

[0005] The application provides a rigid rotor rotating working mode identification device based on equal-phase acquisition, which comprises a rotating telemetry acquisition device 1, a rotor hub central part 2, a rigid rotor 4, an equal-phase data acquisition assembly 5, a conical support assembly 6 and a computer. The equal-phase data acquisition assembly 5 comprises a photoelectric code disc 5.1 and two photoelectric sensors 5.2. The conical support assembly 6 comprises a transmission shaft 6.1 and a bearing support 6.2. The rotor hub central part 2 is arranged on the transmission shaft 6.1, and the transmission shaft 6.1 is arranged on the bearing support 6.2. The rigid rotor 4 is connected to the rotor hub central part 2, and the rotating telemetry acquisition device 1 is arranged on the rigid rotor 4. The photoelectric code disc 5.1 is fixedly arranged on the top of the bearing support 6.2, The photoelectric sensor 5.2 is connected to the transmission shaft 6.1 and rotates with the transmission shaft 6.1, and is located below the rotor hub central part 2 and above the photoelectric code disc 5.1. The photoelectric encoder 5.1 is provided with outer circle reflective marks and inner circle reflective marks; the number of the outer circle reflective marks is multiple and is uniformly distributed along the circumference; the inner circle reflective mark is one and is in phase with one of the outer circle reflective marks; two photoelectric sensors 5.2 are respectively used for detecting the outer circle reflective marks and the inner circle reflective mark; The rotating remote measurement and collection device 1 is used for collecting the load on the rigid rotor 4 when the photoelectric sensor 5.2 detects the outer circle reflective mark; The computer is connected with the rotating remote measurement and collection device 1 and is used for performing rigid rotor rotating working mode identification according to the collected load data.

[0006] Optionally, the computer is specifically used for dividing the data collected by the rotating remote measurement and collection device 1 according to the number of the outer circle reflective marks, and performing rigid rotor rotating working mode identification.

[0007] Optionally, the computer is specifically used for detecting whether the number of the load data collected by the rotating remote measurement and collection device 1 in the collection period corresponding to the adjacent two inner circle reflective marks is consistent with the number of the outer circle reflective marks. If not, the data collected by the rotating remote measurement and collection device 1 is divided according to the number of the load data collected by the rotating remote measurement and collection device 1 in the collection period corresponding to the adjacent two inner circle reflective marks.

[0008] Optionally, the number of the outer circle reflective marks is 64 or 128.

[0009] Optionally, the overall shape of the photoelectric encoder 5.1 is a regular circular ring shape, and the parallelism of the upper and lower surfaces is not more than 0.025, and the flatness is not more than 0.01.

[0010] Optionally, the central axis of the photoelectric encoder 5.1 is consistent with the central axis of the transmission shaft 6.1.

[0011] Optionally, the bearing support 6.2 is arranged on the base 8. The base 8 has an overall appearance of a rectangular truss structure, and the natural frequency is greater than the natural frequency of the rigid rotor 4 to be measured.

[0012] Optionally, two square adjusting pads are welded on the top of the base 8, and the support mounting plate 7 is arranged thereon, and the bearing support 6.2 is arranged on the support mounting plate 7. The middle part is a square steel welded part, and two square adjusting pads are welded at the bottom. The square adjusting pad is used for adjusting the overall parallelism of the upper and lower surfaces of the base 8.

[0013] The application provides a rigid rotor rotating working modal identification device based on equal-phase acquisition, which realizes that the acquired rigid rotor load data is in the same phase angle state under each rotation number in the rigid rotor rotating process. When the rotor speed is m, the rotating telemetry acquisition device sampling rate is fixed as fs, the data acquisition point number of the rigid rotor per rotation is fs / m, if the fluctuation amount of the speed control error of a rotation is ±n in the process of the rotor rotating driven by the motor, the data acquisition point number of the rotation is fs / (m±n), the error is fs*n / m(m±n), and the loss and increase of the data will significantly reduce the effectiveness of the rotor working modal identification when the working modal identification is performed on the data by whole cycle resampling and averaging, especially for the rigid rotor, the inherent frequency and the data sampling rate in the rotating state are higher, and the error is more obvious than that of the conventional rotor. The patent adopts the equal-phase trigger acquisition mode combining the outer circle reflective marker and the inner circle reflective marker, when the outer circle reflective marker is 64k (k is a positive integer), the data acquisition point number of the rigid rotor per rotation is fixed as 64k, if there is a speed control error in a rotation, the data acquisition point number of the rotation is still 64k, which does not affect the processing of the related data in the modal identification process, and since the code disc is fixedly installed and the two photoelectric sensors rotate synchronously with the rigid rotor, the equal-phase trigger acquisition is performed, the acquired rotor load data signal is collected in the same physical position of each rotation number, the random interference caused by the speed and the like is effectively avoided, and the rotating working modal identification precision and effectiveness of the rigid rotor are improved. The rigid rotor rotating working modal identification device based on equal-phase acquisition can ensure that the acquired rigid rotor load data is in the same phase angle state under each rotation number in the rigid rotor rotating process, the random interference in the test process can be effectively reduced by multiple averaging, and the rotating working modal identification precision and effectiveness of the rigid rotor are improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. The drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0015] Figure 1 It is the rigid rotor rotating working modal identification device based on equal-phase acquisition of the present application; Figure 2 It is the equal-phase data acquisition assembly of the present application; Figure 3 It is the photoelectric code disc of the present application; Figure 4 It is the photoelectric fixed support of the present application; Figure 5 is the photoelectric distance measuring adjusting support of the present application; Figure 6 is the conical support assembly of the present application; Figure 7 is the transmission shaft of the present application; Figure 8 is the bearing support of the present application; Figure 9 is the upper bearing assembly of the present application; Figure 10 is the lower bearing assembly of the present application; Figure 11 is the support mounting plate of the present application; Figure 12 is the base of the present application; BRIEF DESCRIPTION OF DRAWINGS rotary telemetry acquisition device 1, rotor hub central piece 2, pitch adjusting joint 3, rigid rotor 4, equal phase data acquisition assembly 5, conical support assembly 6, support mounting plate 7, base 8, motor 9, photoelectric code disc 5.1, photoelectric sensor 5.2, photoelectric fixed support 5.3, photoelectric distance measuring adjusting support 5.4, transmission shaft 6.1, bearing support 6.2, upper bearing assembly 6.3, lower bearing assembly 6.4, elastic coupling 6.5, motor output shaft 6.6. DETAILED DESCRIPTION

[0016] So that the objects, technical solutions and advantages of the embodiments of the present application are more apparent, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application but not all the embodiments. Based on the embodiments in the present application, any person skilled in the art can obtain all other embodiments without creative effort, which should be within the scope of the present application.

[0017] The features and illustrative embodiments of various aspects of the present application will be described below in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely to provide a better understanding of the present application by showing examples of the present application. The present application is in no way limited to any particular set of details disclosed below, but covers any modifications, equivalents, and alternatives falling within the spirit of the present application. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessary obscuring of the present application.

[0018] It should be noted that the features in the embodiments and the embodiments can be combined with each other without conflict, and each embodiment can be mutually referred to and quoted. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0019] The present application will be further described in detail below in combination with the embodiments and the drawings, but the embodiments of the present application are not limited thereto.

[0020] As shown in Figures 1-12 , the present application provides a rigid rotor rotating working modal identification device based on equal phase acquisition, which comprises a rotating telemetry acquisition device 1, a rotor hub central part 2, a pitch adjusting joint 3, a rigid rotor 4, an equal phase data acquisition assembly 5, a conical support assembly 6, a support mounting plate 7, a base 8, and a motor 9, as shown in Figure 1 .

[0021] The equal phase data acquisition assembly 5 is composed of a photoelectric encoder 5.1, a photoelectric sensor 5.2, a photoelectric fixed support 5.3, and a photoelectric distance measuring adjusting support 5.4, as shown in Figure 2 .

[0022] The photoelectric encoder 5.1 is shown in Figure 3 , which has a regular circular shape, is symmetrically distributed along the vertical orthogonal axis, and the overall upper and lower surface parallelism needs to be controlled to be not more than 0.025, and the flatness needs to be controlled to be not more than 0.01. The outer circle of the photoelectric encoder is aligned radially, and a plurality of equal-size reflective markers are uniformly distributed along the spanwise direction, which can be selected according to different data sampling rate requirements, and are used to provide data signal trigger acquisition markers at equal angles / phases. The inner circle of the photoelectric encoder is aligned with the outer circle, and an equal-size reflective marker is arranged, which is used to provide data signal trigger acquisition markers at zero phase. The innermost circle of the photoelectric encoder is uniformly distributed with 6 through holes with a diameter of 9 mm, which is used to be fixed with the conical support assembly 6.

[0023] The photoelectric sensor 5.2 has two groups, which are respectively installed at different radial sizes on the left and right sides of the photoelectric fixed support 5.3, and are divided into inner and outer parts, which can realize high-precision non-contact distance measurement function under high-speed rotation state.

[0024] The photoelectric fixed support 5.3 is shown in Figure 4 , which has a sheet metal bending shape, 2 through holes with a diameter of 11 mm are arranged on the horizontal end surface side, which are used to be fixed with the transmission shaft 6.1, to realize synchronous rotation with the rotor at the same speed, 3 through holes with a diameter of 4 mm are arranged at equal intervals on the vertical end surface side, which are used to be fixed with the photoelectric distance measuring adjusting support 5.4, through the selection and installation of different through holes, which can be used to combine with different positions of the reflective markers on the photoelectric encoder 5.1, to realize the equal phase data signal trigger acquisition function and the zero phase data signal trigger acquisition function.

[0025] The photoelectric distance measuring adjusting support 5.4 is shown inFigure 5 As shown, the overall is a sheet metal square, the upper half of the distribution of 4 equal size waist-shaped hole, through the 4 diameter 3.2mm, 15mm long waist-shaped hole can install fixed photoelectric sensor 5.2, adjust and photoelectric encoder 5.1 working distance, the lower half of the uniform distribution of diameter 3.2mm through hole, used for fixed installation with photoelectric fixed support 5.3, through the installation of different position hole selection, can be respectively make photoelectric sensor 5.2 sensing work in the inner circle and outer circle of photoelectric encoder 5.1.

[0026] Tapered support assembly 6 by transmission shaft 6.1, bearing support 6.2, upper bearing assembly 6.3, lower bearing assembly 6.4, elastic coupling 6.5, motor output shaft 6.6, as shown in Figure 6 .

[0027] Transmission shaft 6.1 as shown in Figure 7 , the overall is a cylindrical forging, along the axis of symmetry structure. The top of the uniform distribution of 6 M10 threaded hole, can be connected with the rotor hub central piece 2 fixed, torque in the process of rotation test, can be achieved through the uppermost height of 20mm boss structure, rigid rotor 4→pitch adjusting joint 3→rotor hub central piece 2→transmission shaft 6.1, can effectively pass the torque in the whole power transmission chain, avoid the top of the M10 bolt shear failure, the bottom of the spline structure. Consider the overall installation and disassembly process, the cross section diameter of transmission shaft 6.1 from top to bottom, should be gradually reduced, and fully consider the installation of bearing positioning. When processing, the blank must be forged, artificial aging treatment, heat treatment should be overall quenching and tempering, ensure HRC28~32, the coaxiality of the top and bottom should be kept within 0.025.

[0028] Bearing support 6.2 as shown in Figure 8 , the overall shape is a conical barrel, as the main load-bearing components in the test, in addition to the torque generated by the rigid rotor 4 Fx, Fy, Fz, Mx and My load, through the upper bearing assembly 6.3 and lower bearing assembly 6.4 to bearing support 6.2 decomposition. The top platform of the uniform distribution of 8 M8 threaded hole, can be used for fixed upper bearing assembly 6.3 and photoelectric encoder 5.1, the wall surface up and down position front and rear face to hole distribution, can be used for installation and disassembly and observation during the test, the bottom platform of the uniform distribution of 8 diameter 40mm through hole, can be connected with the support plate 7 fixed, and through the lower end of the circular stop positioning. The upper and middle part of the middle axis hole respectively for the installation of upper bearing assembly 6.3 and lower bearing assembly 6.4, the coaxiality of the two with the lower end of the circular stop should be kept within 0.06, the middle area side of the hole for the lubricating grease filling, can ensure the working lubrication and heat dissipation of lower bearing assembly 6.4.

[0029] Upper bearing assembly 6.3 as shown in Figure 9As shown, the upper and lower parts are both labyrinth seals, which maintain a small gap with the transmission shaft to avoid solid contact. Through the arrangement of multiple annular sealing teeth around the transmission shaft, the injection of lubricating grease can achieve the effect of leakage prevention due to the throttling effect. The middle part is a standard deep groove ball bearing, which can effectively transfer the radial load generated during the test process according to the path of rigid rotor 4 → pitch adjustment joint 3 → rotor hub central part 2 → transmission shaft 6.1 → upper bearing assembly 6.3 → bearing support 6.2. The bottom part is a bearing support, which can fix and install the upper bearing assembly 6.3 on the bearing support 6.2 through the 6 evenly distributed 9mm diameter holes on the flange surface.

[0030] The lower bearing assembly 6.4 is as shown Figure 10 As shown, the upper and lower parts are both labyrinth seals, which maintain a small gap with the transmission shaft to avoid solid contact. Through the arrangement of multiple annular sealing teeth around the transmission shaft, the injection of lubricating grease can achieve the effect of leakage prevention due to the throttling effect. The middle part is a standard deep groove ball bearing, which can effectively transfer the radial load generated during the test process according to the path of rigid rotor 4 → pitch adjustment joint 3 → rotor hub central part 2 → transmission shaft 6.1 → upper bearing assembly 6.3 → bearing support 6.2. The bottom part is a bearing support, which can fix and install the upper bearing assembly 6.3 on the bearing support 6.2 through the 6 evenly distributed 9mm diameter holes on the flange surface.

[0031] The elastic coupling 6.5 is used to connect the transmission shaft 6.1 and the motor output shaft 6.6, which can effectively transfer the high-speed rotating motion and torque during the process, provide certain elasticity and damping function, and the upper interface is a spline, the size parameter is consistent with the lower end of the transmission shaft 6.1, and the lower interface is a flat key, the parameter is consistent with the motor output shaft 6.6.

[0032] The motor output shaft 6.6 is the power output component of the motor 9, which provides power input and rotating motion for the entire test device through the elastic coupling 6.5.

[0033] The support mounting plate 7 is as shown Figure 11 As shown, the whole is a square plate structure, an 8mm deep recess hole is arranged at the center of the upper surface to ensure that the positive tolerance can be positioned and assembled with the lower end of the bearing support 6.2 circular stop, and is fixed and installed through the evenly distributed 8 M24 threaded holes, a 15mm recess hole is arranged at the center of the lower surface to ensure that the positive tolerance can be positioned and assembled with the upper end of the motor 9 circular stop, and is fixed and installed through the evenly distributed 8 diameter 25mm holes, and 12 diameter 17mm holes are symmetrically and evenly distributed on the left and right edges, which can be used for installation and fixation with the base 8.

[0034] The base 8 is as shownFigure 12 As shown, the overall appearance is a cuboid truss structure, two square adjusting pads are welded on the top, used for installation and fixation with the support mounting plate 7, the overall parallelism of the upper structure of the device can be ensured by adjusting the top pad, the middle part is a square steel welded part, two square adjusting pads are welded on the bottom, which can be fixed and leveled with the ground through the uniform and symmetrical through holes.

[0035] The motor 9 is the power component of the device, has a variable frequency speed regulation function, and the rotation speed accuracy should be better than 0.1%, and is installed and fixed on the support mounting plate 7.

[0036] In the rigid rotor rotating working mode identification process, a digital communication mode is adopted, the motor 9 is remotely controlled in rotation speed through the host computer and the PLC control system, and the power transmission chain of the device drives the entire rigid rotor to rotate at high speed through the motor 9→the transmission shaft 6.1→the rotor hub central part 2→the photoelectric sensor 5.2→the pitch adjusting joint 3→the rigid rotor 4. In the rotating process, when the inner part of the photoelectric sensor 5.2 rotates through the inner circle reflective marker of the photoelectric encoder 5.1, the rising edge is measured and collected, a high level is collected, at this time the zero-phase channel in the software is displayed as 1, as the starting angle data of data collection, and the rotating telemetry collection device 1 is ready to collect at this moment; the photoelectric sensor 5.2 continues to rotate, when the outer part passes through the outer circle reflective marker of the photoelectric encoder 5.1, the rising edge is measured and collected, a high level is collected, at this time the equal-angle channel in the software is displayed as 1, the rotating telemetry collection device 1 collects and sends the load data on the rigid rotor 4, and stores to the host computer, every time the outer part of the photoelectric sensor 5.2 passes through the outer circle reflective marker of the photoelectric encoder 5.1, a group of load data of the rigid rotor 4 at the current angle is collected and stored, when the rigid rotor 4 rotates 360°, the inner part of the photoelectric sensor 5.2 passes through the inner circle reflective marker of the photoelectric encoder 5.1, at this time it is reset to zero as the starting angle data of data collection, i.e. zero-phase data, and the equal-angle and equal-phase rigid rotor load data collection within 360° is completed, the data is subjected to modal parameter identification, i.e. the working mode of the rigid rotor in the rotating operation state is identified.

[0037] The above specific embodiments are detailed descriptions of the present application, which cannot be recognized as being limited to these descriptions only, and for ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions and substitutions can be made without departing from the concept of the present application, which should be regarded as belonging to the protection scope of the present application.

Claims

1. A rigid rotor rotation mode identification device based on equal-phase acquisition, characterized in that, include: Rotary telemetry acquisition device (1), rotor hub central component (2), rigid rotor (4), equal phase data acquisition component (5), conical support component (6), and computer; The equal-phase data acquisition component (5) includes: an optical encoder (5.1) and two optical sensors (5.2); the tapered support component (6) includes: a drive shaft (6.1) and a bearing support (6.2); The rotor hub central component (2) is mounted on the drive shaft (6.1), and the drive shaft (6.1) is mounted on the bearing support (6.2); the rigid rotor (4) is connected to the rotor hub central component (2), and the rotating telemetry acquisition device (1) is mounted on the rigid rotor (4); The photoelectric encoder (5.1) is fixedly mounted on top of the bearing support (6.2). The photoelectric sensor (5.2) is connected to the drive shaft (6.1), rotates with the drive shaft (6.1), and is located below the rotor hub center piece (2) and above the photoelectric encoder (5.1); The photoelectric encoder (5.1) is provided with an outer ring reflective mark and an inner ring reflective mark; there are multiple outer ring reflective marks, which are evenly distributed along the circumference; there is one inner ring reflective mark, which is in phase with one of the outer ring reflective marks; two photoelectric sensors (5.2) are used to detect the outer ring reflective mark and the inner ring reflective mark, respectively. The rotating telemetry acquisition device (1) is used to acquire the load on the rigid rotor (4) when the photoelectric sensor (5.2) detects the outer ring reflective mark; The computer is connected to the rotating telemetry acquisition device (1) for identifying the rigid rotor rotation working mode based on the acquired load data.

2. The rigid rotor rotation mode identification device based on equal-phase acquisition according to claim 1, characterized in that, The computer is specifically used to divide the data collected by the rotating telemetry acquisition device (1) into circles and phases according to the number of reflective marks on the outer ring, and to identify the working mode of the rigid rotor rotation.

3. The rigid rotor rotation mode identification device based on equal-phase acquisition according to claim 1, characterized in that, Specifically, the computer is used to detect whether the number of load data collected by the rotating telemetry acquisition device (1) within the acquisition period corresponding to two adjacent inner ring reflective marks is consistent with the number of outer ring reflective marks; If there is a discrepancy, the data collected by the rotating telemetry acquisition device (1) is divided into circles and phases according to the number of load data collected by the rotating telemetry acquisition device (1) within the acquisition period corresponding to the two adjacent inner circle reflective marks.

4. The rigid rotor rotation mode identification device based on equal-phase acquisition according to claim 1, characterized in that, The number of reflective markings on the outer ring is 64 or 128.

5. The rigid rotor rotation mode identification device based on equal-phase acquisition according to claim 1, characterized in that, The photoelectric encoder (5.1) has a regular circular shape, with the parallelism of the upper and lower surfaces not exceeding 0.025 and the flatness not exceeding 0.

01.

6. The rigid rotor rotation mode identification device based on equal-phase acquisition according to claim 1, characterized in that, The central axis of the photoelectric encoder (5.1) is aligned with the central axis of the drive shaft (6.1).

7. The rigid rotor rotation mode identification device based on equal-phase acquisition according to claim 1, characterized in that, The bearing support (6.2) is mounted on the base (8); The base (8) has a rectangular truss structure and its natural frequency is greater than that of the rigid rotor (4) to be tested.

8. The rigid rotor rotation mode identification device based on equal-phase acquisition according to claim 7, characterized in that, Two square adjusting pads are welded to the top of the base (8), and a support mounting plate (7) is set on it. The bearing support (6.2) is set on the support mounting plate (7). The middle part is a square steel welded component, and the bottom is welded with two square adjustment pads; The square adjustment pad is used to adjust the overall parallelism of the upper and lower surfaces of the base (8).

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