Bolt connection rotor multifunctional rub-impact simulation device and test method thereof

Abstract

The invention discloses a bolt connection rotor multifunctional rub-impact simulation device and a test method thereof. The multifunctional rub-impact simulation device is composed of a test bench base, a motor driving device, a rotor-disc system, a sensor test system and a multifunctional rub-impact simulation system. The multifunctional rub-impact simulation system comprises a rub-impact support, a threaded rod and a multifunctional rub-impact device, and the multifunctional rub-impact device is composed of an annular fixing device, a countersunk head structure, an arc-shaped rub-impact device, a gap adjusting bolt, a limiting nut, an inner hexagon bolt, a spring a and a spring b; the gap adjusting bolt sequentially passes through the through hole in the lower end of the countersunk head structure, the spring a, the screw hole in the upper end of the countersunk head structure, the spring b and the screw hole of the annular fixing device, and the countersunk head structure and the annular fixing device are connected into a whole by tightening the limiting nut. The arc-shaped rub-impact device and the countersunk head structure are connected through an inner hexagon bolt, the rub-impact gap can be adjusted through a telescopic gap adjusting bolt, and the rub-impact rigidity can be adjusted by replacing the size of a spring and the size of the arc-shaped rub-impact device.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of vibration testing technology of rubbing fault mechanical characteristics of aero-engine bolted rotor system, and particularly relates to a multifunctional rubbing simulation device for bolted rotor and a testing method thereof. BACKGROUND

[0002] With the increasing requirements of modern aero-engines for high thrust-to-weight ratio, low fuel efficiency, easy maintenance and compactness, the requirement for rotor-casing clearance has gradually become a key challenge. The trend of aero-engine structure is high thrust-to-weight ratio, low fuel consumption, lightweight and compactness, which reduces the rotor-casing clearance. Since the rotor is the main vibration source, its abnormal vibration may cause rotor-casing rubbing fault, which directly threatens the flight reliability and safety. In addition, reducing the rotor-casing clearance may cause the stiffness softening effect of the bolted connection structure, leading to vibration instability and rubbing fault. However, the specific influence of rubbing fault and connection structure performance change on the vibration characteristics of the rotor system needs further study. In the rotor system with bolted connection structure, its inherent and dynamic characteristics are different from those of the complete system, and for the aero-engine rotor system, the complexity and particularity of its structure lead to unclear vibration characteristics and causes of abnormal vibration. Therefore, to improve the design level of the bolted rotor system, master the vibration law of the system, reduce the occurrence of system vibration fault and improve the flight stability are the key objectives in the current aero-engine research field. However, the complexity of internal structure, harsh working conditions, limitations of experimental methods and limitations of numerical simulation technology make this research field face challenges and limitations.

[0003] Therefore, it is of great significance to design a multifunctional rubbing simulation device for bolted rotor and related testing method, aiming to fill the gap in the theoretical and experimental research on the influence of multi-point rubbing and whole-circle rubbing dynamics of the bolted rotor system, thereby laying a solid foundation for improving flight safety and engine performance. SUMMARY

[0004] In order to solve the above-mentioned problems in the art, the present application provides a multifunctional rubbing simulation device for bolted rotor and a testing method thereof, which can realize the research on the vibration characteristics of rubbing fault working conditions of the aero-engine bolted rotor system. Compared with the existing test bench, the multifunctional rubbing simulation device of the present application can realize variable stiffness and variable gap simulation. In addition, it can simulate single-point rubbing fault, multi-point rubbing fault and whole-circle rubbing fault of rotating machinery, making up for the lack of design of multi-point and whole-circle rubbing simulation device for bolted rotor system and its vibration testing method, and enabling the related experimental research on the influence of bolt pretightening force, rubbing clearance and rubbing stiffness on the vibration characteristics of the rotor system and the influence of single-point rubbing, multi-point rubbing and whole-circle rubbing on the vibration characteristics of the rotor system.

[0005] The technical solutions of the present application are as follows:

[0006] A bolted rotor multifunctional rubbing simulation device, comprising: a test bench base 1, a motor driving device A, a rotor-disc system B, a sensor test system C and a multifunctional rubbing simulation system D. The test bench base 1 is provided with a T-shaped groove slide and a plurality of anchor bolts for fixing the motor base 2, the base a5, the sensor support 9, the rubbing support 11 and the base b17 arranged from left to right. The motor base 2, the base a5, the sensor support 9, the rubbing support 11 and the base b17 can be adjusted and installed along the slide according to the test requirements.

[0007] Further, the motor driving device A comprises a variable frequency motor 3, a motor base 2 and a shaft coupling 4; the motor base 2 is fixed on the test bench base 1; the variable frequency motor 3 is installed on the motor base 2 and is controlled by a frequency converter; one side of the shaft coupling 4 is installed on the output end of the variable frequency motor 3, and the other side is connected with the shaft segment a8.

[0008] The rotor-disc system B comprises a rotor, a bolted structure 13 and two left and right support structures, and the rotor is divided into two segments, namely the shaft segment a8 and the shaft segment b14. The left support structure comprises the base a5, the bearing seat a7, the angular contact ball bearing and the bearing seat end cover a6, and the right support structure comprises the base b17, the bearing seat b15, the cylindrical roller bearing and the bearing seat end cover b16. The base a5 is installed on the test bench base 1, the bearing seat a7 is installed on the base a5 by bolts, and the angular contact ball bearing is installed in the bearing seat a7 and fixed by the bearing seat end cover a6. The base b17 is installed on the other end of the test bench base 1, the bearing seat b15 is installed on the base b17, and the cylindrical roller bearing is installed in the bearing seat b15 and fixed by the bearing seat end cover b16.

[0009] Further, the bolted structure 13 comprises a disc a18, a disc b19, bolts and nuts. One end of the shaft segment a8 and the shaft segment b14 is provided with two threaded holes, the center of the disc a18 and the disc b19 is provided with an annular protrusion, two screw holes are arranged in the annular protrusion, and the shaft segment a8 and the shaft segment b14 are matched by bolts respectively. The disc b19 has a stop structure, the disc a18 has no stop structure, a plurality of screw holes are uniformly distributed along the circumference of the disc edge, and the disc a18 and the disc b19 are fastened as a whole by bolts. One end of the shaft segment a8 with a screw hole is connected with the disc a18, and the other end passes through the angular contact ball bearing and is connected with the shaft coupling 4. One end of the shaft segment b14 with a screw hole is connected with the disc b19, and the other end passes through the cylindrical roller bearing.

[0010] The sensor test system C comprises an eddy current displacement sensor, a sensor support 9 and a data acquisition system; the sensor support 9 is provided with screw holes for mounting the eddy current displacement sensor, the sensor support 9 is installed on one side of the bolt connection structure 13, the eddy current displacement sensor is mounted on the sensor support 9 through the screw holes, and the eddy current displacement sensor transmits test data to a computer through the data acquisition system.

[0011] The multifunctional rubbing simulation system D comprises a rubbing support 11, a threaded rod 10 and a multifunctional rubbing device 12; the rubbing support 11 is a U-shaped structure, is installed on the test bench base 1 through foundation bolts and is located below the disc a 18 or the disc b 19, the top end of the protruding part on the two sides of the rubbing support 11 is provided with a threaded hole, the threaded rod 10 is matched with the threaded hole and is installed on the rubbing support 11.

[0012] The multifunctional rubbing device 12 comprises an annular fixing device 20, a countersunk structure 21, an arc-shaped rubbing device 22, a gap adjusting bolt 23, a limiting nut 24, an internal hexagonal bolt 25, a spring a 26 and a spring b 27; the outer surface of the annular fixing device 20 is provided with two symmetrical horizontal protrusions, the protrusions are provided with screw holes, the annular fixing device 20 is fastened on the threaded rod 10 through nuts, and a plurality of block structures are distributed on the outer surface of the annular fixing device 20 along the circumference.

[0013] Further, the block structure is provided with two screw holes for mounting the countersunk structure 21; the upper end of the countersunk structure 21 is provided with two screw holes, the lower end is provided with two through holes, the two sides are respectively provided with one threaded hole, the gap adjusting bolt 23 passes through the lower end through hole of the countersunk structure 21, the spring a 26, the upper end screw hole of the countersunk structure 21, the spring b 27 and the screw hole of the block structure in sequence, the annular fixing device 20 and the countersunk structure 21 are connected as a whole through the limiting nut 24 fastening, and the countersunk structure 21 is located in the annular fixing device 20; the two sides of the arc-shaped rubbing device 22 are provided with screw holes, the internal hexagonal bolt 25 passes through the two sides screw holes of the arc-shaped rubbing device 22 and is matched with the threaded holes on the two sides of the countersunk structure 21, so that the arc-shaped rubbing device 22 and the countersunk structure 21 are connected as a whole, each countersunk structure 21 corresponds to one arc-shaped rubbing device 22; the lower surface of the arc-shaped rubbing device 22 is in contact with the outer surface of the disc a 18 or the disc b 19.

[0014] Compared with the prior art, the present application has the following effects:

[0015] (1) The multifunctional rub-impact simulation system is used for realizing rub-impact simulation of the bolted rotor system of the aero-engine, adjusting the extension length of the bolt 23 by controlling the gap, realizing rub-impact gap adjustment, better reflecting the influence of the rub-impact gap on the vibration characteristics of the rotor system, and being capable of carrying out the nonlinear behavior of the bolted rotor caused by different stiffnesses by replacing the wire diameter of the spring.

[0016] (2) Compared with the existing test bench, the multifunctional rub-impact simulation device of the bolted rotor is more simple and reasonable in structure, is designed according to the structural characteristics of the real bolted rotor of the aero-engine, realizes rub-impact simulation experiments on each disc of the bolted structure 13 by moving horizontally on the T-shaped groove slide of the test bench base 1, controls the rub-impact position by disassembling and assembling the countersunk structure 21 and the arc-shaped rub-impact device 22, simulates single-point rub-impact faults, multi-point rub-impact faults and whole-circle rub-impact faults of the aero-engine rotor system, makes up for the lack of the test method for multi-point rub-impact and whole-circle rub-impact of the bolted rotor of the existing test bench, and can carry out related experimental researches considering the influence of the bolt pretightening force, the rub-impact gap and the rub-impact stiffness on the vibration transmission characteristics of the rotor system.

[0017] (3) The multifunctional rub-impact simulation device can effectively control the rub-impact gap and the rub-impact stiffness, simulate single-point rub-impact, multi-point rub-impact and whole-circle rub-impact, and better reflect the influence of the rub-impact faults on the aero-engine rotor system and the vibration transmission law. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The bolted rotor multifunctional rub-impact simulation device system is composed of the bolted rotor multifunctional rub-impact simulation device.

[0019] Figure 2 The bolted rotor multifunctional rub-impact simulation device structure is shown in detail.

[0020] Figure 3 The bolted rotor multifunctional rub-impact simulation device is shown in detail.

[0021] Figure 4 The bolted rotor multifunctional rub-impact simulation device is shown in detail.

[0022] Figure 5 The bolted rotor multifunctional rub-impact simulation device is shown in detail.

[0023] Figure 6 The bolted rotor multifunctional rub-impact simulation device is shown in detail.

[0024] Figure 7 This is a schematic diagram of the countersunk head structure in the bolt-connected rotor multi-functional collision simulation device of the present invention;

[0025] Figure 8 This is a schematic diagram of the arc-shaped rubbing device in the multifunctional rubbing simulation device for bolted rotors of the present invention;

[0026] Figure 9 This is a schematic diagram of the spring between the annular fixing device and the countersunk head structure in the multifunctional collision simulation device for bolted rotors of the present invention.

[0027] Figure 10 This is a schematic diagram of the spring between the countersunk structure and the arc-shaped rubbing device in the multifunctional collision simulation device for bolted rotors of the present invention.

[0028] In the diagram: A. Motor drive device; B. Rotor-disc system; C. Sensor testing system; D. Multifunctional collision simulation system; 1. Test bench base; 2. Motor base; 3. Variable frequency motor; 4. Coupling; 5. Base a; 6. Bearing housing end cover a; 7. Bearing housing a; 8. Shaft section a; 9. Sensor bracket; 10. Threaded rod; 11. Collision support; 12. Multifunctional collision device; 13. Bolted connection structure; 14. Shaft section b; 15. Bearing housing b; 16. Bearing housing end cover b; 17. Base b; 18. Disc a; 19. Disc b; 20. Annular fixing device; 21. Countersunk structure; 22. Arc-shaped collision device; 23. Gap adjusting bolt; 24. Limit nut; 25. Socket head bolt; 26. Spring a; 27. Spring b. Detailed Implementation

[0029] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and technical solutions.

[0030] This invention provides a multifunctional collision simulation device for bolt-connected rotors, such as... Figure 1 As shown, it mainly consists of a test bench base 1 and a motor drive device A, a rotor-disc system B, a sensor testing system C, and a multi-functional collision simulation system D, which are installed horizontally in sequence. Specifically, the test bench base 1 is equipped with T-slot slides and multiple anchor bolts to secure each system and provide stable experimental conditions. The motor drive device A is mounted on the test bench base 1 via anchor bolts and connected to the left side of the rotor-disc system B. The sensor testing system C is located on one side of the bolted connection structure 13, and the multi-functional collision simulation system D is located on one of the discs of the bolted connection structure 13.

[0031] Specifically, such as Figure 2As shown, the motor drive device A includes a variable frequency motor 3, a motor base 2 and a shaft coupling 4. The motor base 2 is fixed on the T-shaped groove slide of the test bench base 1 through anchor bolts, the variable frequency motor 3 is fixed on the motor base 2 through bolts, the variable frequency motor 3 is controlled through a frequency converter, the shaft coupling 4 is installed at the output end of the variable frequency motor 3, and the other end of the shaft coupling 4 is connected with the shaft segment a8.

[0032] Specifically, as shown in the figure, Figure 2 and Figure 3 The rotor-disc system B of the application includes two support structures, a bolt connection structure 13 and a rotor (including a shaft segment a8 and a shaft segment b14). The left support structure is composed of a base a5, a bearing seat a7, an angular contact ball bearing and a bearing seat end cover a6; the right support structure is composed of a base b17, a bearing seat b15, a cylindrical roller bearing and a bearing seat end cover b16; the base a5 is fixed on the right side of the motor drive device A through anchor bolts, the bearing seat a7 is installed on the base a5 through bolts, the angular contact ball bearing is installed in the bearing seat a7 and is fixed through the bearing seat end cover a6; the base b17 is fixed on the right end of the test bench base 1 through anchor bolts, the bearing seat b15 is installed on the base b17, and the cylindrical roller bearing is installed in the bearing seat b15 and is fixed through the bearing seat end cover b16. The bolt connection structure 13 includes a disc a18 and a disc b19; the center of the disc a18 and the disc b19 is provided with two screw holes and an annular protruding structure, the shaft segment a8 and the shaft segment b14 are connected through an internal hexagonal bolt, the disc b19 is provided with a stop opening, the disc a18 is not provided with a stop opening, the disc edge is provided with a plurality of screw holes which are uniformly distributed along the circumference and are connected through bolts; the bottom of the shaft segment a8 and the shaft segment b14 is provided with two threaded holes, one side of the shaft segment a8 is connected with the disc a18, the other side penetrates through the angular contact ball bearing and is connected with the shaft coupling, the other side is a three-step structure, the first step is used for connecting the shaft coupling, the second step is used for installing the bearing, one side of the shaft segment b14 is connected with the disc b19, the other side penetrates through the cylindrical roller bearing, and the other side is a two-step structure, the first step is used for installing the bearing.

[0033] Specifically, as shown in the figure, Figure 4 The sensor test system C is composed of an eddy current displacement sensor, a sensor support 9 and a data acquisition system, the sensor support 9 is installed on one side of the bolt connection structure 13, and the upper surface of the sensor support 9 is provided with screw holes for installing the eddy current displacement sensor, the eddy current displacement sensor is installed on the sensor support 9 through the screw holes, and the test data is transmitted to the computer through the data acquisition system.

[0034] Specifically, as shown in the figure, Figure 2 The multifunctional rub-impact simulation system D of the application includes a rub-impact support 11, a threaded rod 10 and a multifunctional rub-impact device 12, the rub-impact support 11 is fixed below the disc through anchor bolts, the upper end of the rub-impact support 11 is provided with two threaded holes, the threaded rod 10 is matched with the threaded holes and is installed on the rub-impact support 11.

[0035] Specifically, such as Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the multifunctional friction device 12 includes an annular fixing device 20, a countersunk structure 21, an arc-shaped friction device 22, a gap adjusting bolt 23, a limiting nut 24, an internal hex bolt 25, a spring a26, and a spring b27. The annular fixing device 20 has screw holes at both ends and is fastened to the threaded rod 10 by nuts. The annular fixing device 20 has multiple block structures evenly distributed around the outer end of the annulus, and each block structure has two screw holes. The countersunk structure 21 has two screw holes at the upper end, two through holes at the lower end, and a threaded hole on each side. The gap adjusting bolt 23 passes through the through hole at the lower end of the countersunk structure 21 and the spring a26 in sequence. 6. The countersunk structure 21 has a screw hole at its upper end, a spring b27, and an annular fixing device 20. The annular fixing device 20 is connected to the countersunk structure 21 as a whole, and the rubbing gap is fixed by a limiting nut 24. The arc-shaped rubbing device 22 has screw holes on both sides. The internal hexagon bolts 25 pass through the screw holes on both sides of the arc-shaped rubbing device 22 and mate with the threaded holes on both sides of the countersunk structure 21, so that the arc-shaped rubbing device 22 and the countersunk structure 21 are connected as a whole. The lower surface of the arc-shaped rubbing device 22 contacts the outer surface of the disc a18 or disc b19. The gap between the lower surface of the arc-shaped rubbing device 22 and the outer surface of the disc a18 or disc b19 is adjusted by the limiting nut 24. The rubbing stiffness can be adjusted by changing the dimensions of the spring a26, spring b27, and arc-shaped rubbing device 22.

[0036] This invention proposes a testing method based on the aforementioned multifunctional impact simulation device for bolted rotors, specifically including the following steps:

[0037] (1) Specifically, such as Figure 2 As shown, two eddy current displacement sensors are passed through the top screw hole and the side screw hole of the sensor bracket 9 respectively and fixed to measure the vibration response signal of the rotor in the vertical and horizontal directions. The eddy current displacement sensor, signal conditioner, LMS system and computer are connected in sequence, and the sampling time and sampling rate of the sampling system are set on the computer.

[0038] (2) By rotating the limit nut 24, the height of the clearance adjusting bolt 23 is increased, that is, the test is carried out without the fault of contact and friction. The same preload is applied to each bolt of the disc by using a constant torque wrench to tighten them in sequence so that they have the same connection stiffness. The speed of the variable frequency motor 3 is adjusted by the frequency converter, and the frequency sweep test is carried out under multiple sets of preload. The collected displacement response signals are plotted into a time domain response diagram to analyze the influence of preload on the response amplitude of the bolt-connected rotor. The time domain signal is converted into a frequency domain signal by Fourier transform, and the waterfall diagram and amplitude-frequency characteristic curve are plotted to analyze the influence of different preloads on the natural frequency of the bolt-connected rotor and the vibration transmission law.

[0039] (3) Apply the same preload to each bolt of the disc by tightening it in sequence using a constant torque wrench to make them have the same connection stiffness; adjust the gap between the arc-shaped rubbing device 22 and the disc by rotating the limit nut 24 and adjusting the length of the expansion gap adjusting bolt 23; measure the displacement response signal at each speed under different rubbing gaps in sequence; draw the time domain response diagram, waterfall diagram and amplitude frequency characteristic curve; and analyze the influence of different rubbing gaps on the bolt-connected rotor system and the vibration transmission law.

[0040] (4) Apply the same preload to each bolt of the disc by tightening it in sequence with a constant torque wrench so that it has the same connection stiffness. Fix the extension length of the gap adjustment bolt 23 by tightening the limit nut 24, that is, fix the gap between the arc-shaped friction device 22 and the disc. Adjust the friction stiffness by changing the wire diameter of spring a26 and spring b27. Measure the vibration response signal at each speed under different friction stiffnesses in sequence, and draw the time domain response diagram, waterfall diagram and amplitude frequency characteristic curve to analyze the influence of different friction stiffnesses on the bolt-connected rotor system and the vibration transmission law.

Claims

1. A multifunctional collision simulation device for bolt-connected rotors, characterized in that, The bolt-connected rotor multi-functional collision simulation device includes: a test bench base (1), a motor drive device (A), a rotor-disc system (B), a sensor testing system (C), and a multi-functional collision simulation system (D); the test bench base (1) is provided with a T-slot slide and multiple anchor bolts for fixing the motor base (2), base a (5), sensor bracket (9), collision support (11), and base b (17) arranged from left to right. The motor base (2), base a (5), sensor bracket (9), collision support (11), and base b (17) can be adjusted in installation position along the slide according to test requirements. The motor drive device (A) includes a variable frequency motor (3), a motor base (2), and a coupling (4); the motor base (2) is fixed on the test bench base (1); the variable frequency motor (3) is installed on the motor base (2) and controlled by a frequency converter; one side of the coupling (4) is installed at the output end of the variable frequency motor (3), and the other side is connected to the shaft segment a (8); The rotor-disc system (B) consists of a rotor, a bolted connection structure (13), and two support structures on the left and right sides. The rotor is divided into two sections: shaft section a (8) and shaft section b (14). The left support structure includes a base a (5), a bearing housing a (7), an angular contact ball bearing, and a bearing housing end cover a (6). The right support structure includes a base b (17), a bearing housing b (15), a cylindrical roller bearing, and a bearing housing end cover b (16). The base a (5) is installed on the test bench base (1). The bearing housing a (7) is installed on the base a (5) by bolts. The angular contact ball bearing is installed in the bearing housing a (7) and fixed by the bearing housing end cover a (6). The base b (17) is installed on the other end of the test bench base (1). The bearing housing b (15) is installed on the base b (17). The cylindrical roller bearing is installed in the bearing housing b (15) and fixed by the bearing housing end cover b (16). The bolted connection structure (13) includes a disc a (18), a disc b (19), bolts and nuts. One end of the shaft segment a (8) and the shaft segment b (14) is provided with two threaded holes. The center of the disc a (18) and the disc b (19) is provided with an annular protrusion, and the annular protrusion is provided with two threaded holes. The bolts are used to engage with the shaft segment a (8) and the shaft segment b (14) respectively. The disc b (19) has a stop structure, while the disc a (18) does not have a stop structure. The edge of the disc has multiple threaded holes evenly distributed around the circumference. The bolts are used to fasten the disc a (18) and the disc b (19) into a whole. One end of the shaft segment a (8) with a threaded hole is connected to the disc a (18), and the other end passes through an angular contact ball bearing and is connected to the coupling (4). One end of the shaft segment b (14) with a threaded hole is connected to the disc b (19), and the other end passes through a cylindrical roller bearing. The sensor testing system (C) includes an eddy current displacement sensor, a sensor bracket (9), and a data acquisition system. The sensor bracket (9) is provided with screw holes for mounting the eddy current displacement sensor. The sensor bracket (9) is mounted on one side of the bolt connection structure (13). The eddy current displacement sensor is mounted on the sensor bracket (9) through the screw holes. The eddy current displacement sensor transmits test data to the computer through the data acquisition system. The multi-functional collision simulation system (D) includes a collision support (11), a threaded rod (10), and a multi-functional collision device (12); the collision support (11) is a U-shaped structure, which is installed on the test bench base (1) by anchor bolts, located below disk a (18) or disk b (19), and the top of the protruding parts on both sides are provided with threaded holes, and the threaded rod (10) is matched with the threaded holes and installed on the collision support (11); The multi-functional friction device (12) includes an annular fixing device (20), a countersunk structure (21), an arc-shaped friction device (22), a gap adjusting bolt (23), a limiting nut (24), an internal hex bolt (25), a spring a (26), and a spring b (27); the outer surface of the annular fixing device (20) is provided with two symmetrical horizontal protrusions, and the protrusions are provided with screw holes. The annular fixing device (20) is fastened to the threaded rod (10) by the nut. Multiple block structures are evenly distributed along the circumference on the outer surface of the annular fixing device (20); The block structure has two screw holes for installing the countersunk head structure (21); the countersunk head structure (21) has two screw holes at the upper end, two through holes at the lower end, and a threaded hole on each side. The gap adjusting bolt (23) passes through the through hole at the lower end of the countersunk head structure (21), spring a (26), the screw hole at the upper end of the countersunk head structure (21), spring b (27), and the screw hole of the block structure in sequence, and is fastened by the limiting nut (24) to connect the annular fixing device (20) and the countersunk head structure (21) into a whole. The head structure (21) is located inside the annular fixing device (20); the arc-shaped rubbing device (22) has screw holes on both sides, and the internal hex bolts (25) pass through the screw holes on both sides of the arc-shaped rubbing device (22) and cooperate with the threaded holes on both sides of the countersunk structure (21), so that the arc-shaped rubbing device (22) and the countersunk structure (21) are connected as a whole, and each countersunk structure (21) corresponds to one arc-shaped rubbing device (22); the lower surface of the arc-shaped rubbing device (22) is in contact with the outer surface of disk a (18) or disk b (19).

2. The multifunctional collision simulation device for bolted rotors according to claim 1, characterized in that, Adjust the rubbing gap by adjusting the gap between the lower surface of the arc-shaped rubbing device (22) and the outer surface of disc a (18) or disc b (19) using the limiting nut (24); adjust the rubbing stiffness by changing the spring a (26) and spring b (27) and the size of the arc-shaped rubbing device (22).

3. The test method for a multifunctional impact simulation device for bolted rotors as described in claim 1 or 2, characterized in that, Includes the following steps: (1) Pass two eddy current displacement sensors through the top screw hole and the side screw hole of the sensor bracket (9) respectively and fix them to measure the vibration response signal of the rotor in the vertical and horizontal directions; connect the eddy current displacement sensor, the signal conditioner, the LMS system and the computer in sequence, and set the sampling time and sampling rate of the sampling system on the computer; (2) By rotating the limit nut (24), the height of the gap adjusting bolt (23) is increased, that is, the test is carried out without the fault of contact and friction. The same preload is applied to each bolt of the disc by using a constant torque wrench in a sequential tightening manner so that they have the same connection stiffness. The speed of the variable frequency motor (3) is adjusted by the frequency converter, and the frequency sweep test is carried out under multiple sets of preload. The collected displacement response signals are plotted into a time domain response diagram to analyze the influence of preload on the response amplitude of the bolt-connected rotor. The time domain signal is converted into a frequency domain signal by Fourier transform, and the waterfall diagram and amplitude-frequency characteristic curve are plotted to analyze the influence of different preloads on the natural frequency of the bolt-connected rotor and the vibration transmission law. (3) Apply the same preload to each bolt of the disc by tightening it in sequence using a constant torque wrench so that they have the same connection stiffness; adjust the gap between the arc-shaped rubbing device (22) and the disc by rotating the limit nut (24) and adjusting the length of the telescopic gap adjusting bolt (23); measure the displacement response signal at each speed under different rubbing gaps in sequence, draw the time domain response diagram, waterfall diagram and amplitude frequency characteristic curve, and analyze the influence of different rubbing gaps on the bolt-connected rotor system and the vibration transmission law; (4) Apply the same preload to each bolt of the disc by tightening it in sequence with a constant torque wrench so that they have the same connection stiffness. Fix the extension length of the gap adjustment bolt (23) by tightening the limit nut (24), that is, fix the gap between the arc-shaped rubbing device (22) and the disc. Adjust the rubbing stiffness by changing the wire diameter of spring a (26) and spring b (27). Measure the vibration response signal at each speed under different rubbing stiffnesses in sequence, and draw the time domain response diagram, waterfall diagram and amplitude frequency characteristic curve to analyze the influence of different rubbing stiffnesses on the bolt-connected rotor system and the vibration transmission law.

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