Bent-torsional coupling rotor test device and method capable of applying transverse and torsional excitation

Abstract

The invention belongs to a test device and method in the field of rotary machinery, and discloses a bending-torsion coupling rotor test device and method capable of applying transverse and torsional excitation, and the bending-torsion coupling rotor test device comprises a driving device part, a bending-torsion coupling rotor part, a transverse excitation device part and a torsional excitation device part. The transverse excitation device part is used for applying transverse excitation to the rotating shaft in two radial directions which are perpendicular to each other to enable the rotating shaft to generate precession, and the twisting excitation device part is used for applying torque to the rotating circumferential direction of the rotating shaft; the device is simple in structure and easy to disassemble, and response characteristics of the bending-torsion coupling rotor under transverse, torsion and unbalanced excitation can be studied.

Description

Technical Field

[0001] The invention relates to a testing device and a method in the field of rotating machinery, and in particular to a bending-torsion coupling rotor testing device and a method capable of applying lateral and torsional excitation. Background Art

[0002] Bending and torsional vibrations of aircraft engine rotor systems are two basic forms of shaft vibration. Among them, bending vibration has attracted people's attention and research as early as the beginning of the last century due to its obvious vibration phenomenon. However, due to its hidden nature, research on torsional vibration was carried out relatively late. The engine is affected by factors such as air flow pulsation and friction during operation. The rotor will be subjected to torque excitation that changes with time, resulting in torsional vibration during operation. Since the rotor generally has no damping device in the torsional direction, once torsional modal vibration occurs, it will be very dangerous!

[0003] Traditional rotor dynamics analysis usually ignores torsional vibration and its coupling with bending vibration. In fact, any unbalanced rotor has the potential to cause bending-torsion coupling vibration. Studies have shown that: 1) a rotor subjected to lateral excitation will exhibit frequency-modulated vibration components of rotational frequency and external excitation in the torsional direction; 2) a rotor subjected to torsional excitation will exhibit frequency-modulated vibration components in the lateral direction; 3) when the operating speed is equal to the sum of the torsional modal frequency and the bending modal frequency, an unbalanced rotor may experience bending-torsion coupling instability.

[0004] In summary, it is necessary to fully study the torsional vibration and bending-torsion coupled vibration of the unbalanced rotor in order to more accurately predict the bending-torsion dynamic characteristics of the aero-engine rotor system during normal operation, and even guide the improved design of the aero-engine system. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a bending-torsion coupling rotor test device and method capable of applying lateral and torsional excitations to solve the problems in the prior art. The technical solution adopted by the present invention is:

[0006] A bending-torsion coupling rotor test device capable of applying lateral and torsional excitations, comprising a driving device part, a bending-torsion coupling rotor part, a lateral excitation device part and a torsional excitation device part;

[0007] The bending-torsion coupling rotor part includes a first wheel disc, a second wheel disc, a rotating shaft, a low torsional stiffness shaft, a torque sensor and a matching coupling, a bearing, and a support structure; the second wheel disc is arranged on the rotating shaft;

[0008] The lateral excitation device part is arranged beside the second wheel disc, and the lateral excitation device part is used to apply excitation to the rotating shaft along two mutually perpendicular radial directions to generate vibration, so as to make the rotating shaft precess eccentrically, and the precession trajectory is a perfect circle;

[0009] One end of the rotating shaft away from the driving device is connected to the torsional vibration excitation device part, and the torsional vibration excitation device part is used to apply torque to the rotational circumference of the rotating shaft. The other end of the rotating shaft is connected to the driving device part through a low torsional stiffness shaft, a torque sensor, and a first wheel.

[0010] Furthermore, the driving device part includes a motor and a motor coupling; the motor shaft head of the motor is connected to one end of the motor coupling, and the other end of the motor coupling is connected to the first wheel.

[0011] Furthermore, the first wheel is connected to one end of the low torsional stiffness shaft through a torque sensor and a first coupling in sequence, the other end of the low torsional stiffness shaft is connected to the rotating shaft through a second coupling, and the second wheel is sleeved on the rotating shaft through a wheel expansion sleeve.

[0012] Furthermore, both ends of the rotating shaft are connected to the test bench through a first supporting structure and a second supporting structure respectively, and the lateral excitation device part and the second wheel disc are located between the first and second supporting structures.

[0013] Further, the lateral excitation device part includes two top rod type exciters, namely: a first top rod type exciter and a second top rod type exciter;

[0014] The output ends of the two mandrel-type vibration exciters are respectively fixedly connected to the first threaded mandrel and the second threaded mandrel;

[0015] The ends of the first threaded push rod and the second threaded push rod are both connected to the push rod bearing seat, and the push rod bearing seat is rotatably connected to the rotating shaft through the push rod bearing;

[0016] The first threaded push rod and the second threaded push rod are perpendicular to each other, and both are located in the radial direction of the rotating shaft.

[0017] Furthermore, the lateral excitation device part also includes a first signal generator, a first power amplifier and a second power amplifier;

[0018] The first signal generator is connected to the first power amplifier and the second power amplifier, the first power amplifier is connected to the first top-rod vibration exciter, and the second power amplifier is connected to the second top-rod vibration exciter.

[0019] Further, the torsional vibration excitation device part includes a torsional vibration excitation coupling and a torsional vibration exciter;

[0020] The torsional vibration exciter is connected to the rotating shaft via the torsional vibration excitation coupling.

[0021] Furthermore, the torsional vibration excitation device also includes a second signal generator and a third power amplifier; the second signal generator is connected to the third power amplifier, and the third power amplifier is connected to the torsional vibration exciter.

[0022] A method for partially applying circular precession excitation to a lateral excitation device comprises the following steps:

[0023] The first step is to close the torsional excitation device;

[0024] The second step is to give the angular frequency and amplitude of the circular precession trajectory;

[0025] The third step is to set the first signal generator to output two simple harmonic signals with phase difference to the first and second power amplifiers;

[0026] In the fourth step, the first and second power amplifiers are respectively set to corresponding amplification factors, and output power signals to two top-rod vibrators, so that the rotating shaft is stimulated to undergo circular precession.

[0027] A method for partially applying torsional excitation to a torsional excitation device comprises the following steps:

[0028] The first step is to turn off the lateral vibration excitation device and disconnect the torsional vibration exciter connection;

[0029] The second step is to drive the car to a set speed;

[0030] The third step is to measure the voltage across the torsional exciter, recorded as V1;

[0031] Step 4: Set the DC voltage amplitude of the second signal generator and the power generator amplification factor so that the output DC voltage amplitude is equal to V1;

[0032] Step 5, the second signal generator signal is superimposed with a simple harmonic vibration signal of a given frequency;

[0033] Step 6, connecting the torsional exciter to the third power amplifier;

[0034] Step 7: The torsional vibrator outputs a fluctuating torque.

[0035] The present invention has the following beneficial effects:

[0036] (1) The device has a simple structure and is easy to disassemble. It can study the response characteristics of the bending-torsion coupled rotor under lateral, torsional and unbalanced excitations.

[0037] (2) The bending-torsion coupling rotor has two wheels, which are connected by a coupling, a low torsional stiffness shaft, and a rotating shaft. By adjusting the material, diameter, and length of the low torsional stiffness shaft, its torsional stiffness is adjusted to change the torsional modal frequency of the rotor system. By adjusting the support position of the rotating shaft to which the wheel is fixed, the lateral modal frequency of the rotor system can be changed. By adjusting the axial position of the wheel on the rotating shaft, the lateral modal frequency and vibration type of the rotor system can be changed. The adjustability of the above structure is conducive to changing the test state and obtaining good test results.

[0038] (3) The present invention uses a torque sensor to measure the fluctuating torque of the shaft system; the torque sensor is a mature industrial product with low cost and high precision;

[0039] (4) The lateral excitation device can apply positive or negative precession excitation of arbitrary waveform, amplitude and frequency to the bending-torsion coupled rotor, which is convenient for conducting tests on modulated vibration in the torsional direction under lateral excitation;

[0040] (5) The torsional excitation device can apply torque excitation of arbitrary waveform, amplitude and frequency to the bending-torsion coupled rotor, making it convenient to carry out experiments on lateral modulated vibration under torsional excitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0042] Figure 2 It is an overall three-dimensional oblique view of the present invention;

[0043] Figure 3 is a schematic diagram of the lateral excitation application scheme;

[0044] Figure 4 It is a flow chart of the transverse excitation method;

[0045] Figure 5 is a schematic diagram of the torsional excitation application scheme;

[0046] Figure 6 It is a flow chart of the torsional excitation method;

[0047] In the figure: drive device part 10, active motor 11, motor shaft head 11A, motor shaft center line 11B, motor coupling 12, bending and torsion coupling rotor part 20, first wheel disc 21, torque sensor 22, first coupling 23, second coupling 25, low torsional stiffness shaft 24, first support bearing expansion sleeve 26, second support bearing expansion sleeve 31, ball bearing 27, first support bearing seat 28, second support bearing seat 33, wheel disc expansion sleeve 29, second wheel disc 30, unbalanced threaded hole 30A, roller bearing 32, rotating shaft 34, test bench 40, torque sensor Support 41, first support 42, second support 45, first load-bearing frame 43, second load-bearing frame 46, first bearing seat adapter flange 44, second bearing seat adapter flange 47, lateral vibration excitation device part 50, first push rod type vibration exciter 51A, second push rod type vibration exciter 51B, first threaded push rod 52A, second threaded push rod 52B, push rod bearing seat 53, push rod bearing 54, push rod bearing expansion sleeve 55, torsional vibration excitation device part 60, torsional vibration coupling 61, torsional vibration exciter 62, adapter flange 63, third load-bearing frame 64, third support 65. DETAILED DESCRIPTION

[0048] The following will be combined with the embodiments of the present invention Figure 1-Figure 6 , the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0049] A bending-torsion coupling rotor test device capable of applying lateral and torsional excitations comprises a driving device part 10, a bending-torsion coupling rotor part 20, a lateral excitation device part 20 and a torsional excitation device part 60;

[0050] The bending-torsion coupling rotor part 20 includes a rotor and a stator, specifically including a first wheel disc 21, a second wheel disc 30, a rotating shaft 34, a torque sensor 22, a low torsional stiffness shaft 24, a first coupling 23, a second coupling 25, a first supporting bearing expansion sleeve 26, a second supporting bearing expansion sleeve 31, a ball bearing 27, a first supporting bearing seat 28, a second supporting bearing seat 33, a wheel disc expansion sleeve 29, an unbalanced threaded hole 30A, a roller bearing 32, a test bench 40, a torque sensor support 41, a first support 42, a second support 45, a first load-bearing frame 43, a second load-bearing frame 46, a first bearing seat adapter flange 44, and a second bearing seat adapter flange 47;

[0051] The second wheel disc 30 is disposed on the rotating shaft 34;

[0052] The lateral excitation device part 20 is arranged beside the second wheel disc 30, and the lateral excitation device part 20 is used to apply excitation to the rotating shaft 34 along two mutually perpendicular radial directions to generate vibration, so as to make the rotating shaft 34 eccentrically precess, and the precession trajectory can be a perfect circle or other complex shapes;

[0053] One end of the driving device part 10 of the rotating shaft 34 is connected to the torsional vibration excitation device part 60, and the torsional vibration excitation device part 60 is used to apply torque to the rotational circumference of the rotating shaft 34. The other end of the rotating shaft 34 is connected to the driving device part 10 through a low torsional stiffness shaft 24, a torque sensor 22, and a first wheel 21.

[0054] In the initial state of the bending-torsion coupling rotor part 20 of the present invention, the first wheel disc 21, the second wheel disc 30 and the rotating shaft 34 are coaxially distributed. When the rotating shaft 34 is acted upon by the lateral excitation device part 20, radial bending occurs, so that the part of the rotating shaft 34 connected to the lateral excitation device part 20 changes from self-rotation around its axis in the initial state to revolution (or precession) around its original axis.

[0055] Further, the driving device part 10 includes a motor 11 and a motor coupling 12; the motor shaft head 11A of the motor 11 is connected to one end of the motor coupling 12, and the other end of the motor coupling 12 is connected to the first wheel 21. Preferably, the motor coupling 12 is a rope coupling, which can better isolate the adverse vibration from the motor.

[0056] Furthermore, the first wheel 21 is connected to one end of the low torsional stiffness shaft 24 through the torque sensor 22 and the first coupling 23 in sequence, and the other end of the low torsional stiffness shaft 24 is connected to the rotating shaft 34 through the second coupling 25, and the second wheel 30 is sleeved on the rotating shaft 34 through the wheel expansion sleeve 29.

[0057] The polar moment of inertia of the first wheel disc 21 is much larger than that of the second wheel disc 30. The first wheel disc 21 is connected to the torque sensor 22 by a cylindrical interference fit. Preferably, the rotating shaft 34 is a quenched and tempered alloy steel smooth shaft. The first coupling 23 and the second coupling 25 are selected as diaphragm couplings. The diaphragm coupling is a flexible coupling with large torsional stiffness, high strength, no rotational clearance, and good continuity, which is conducive to ensuring the linear elastic assumption and test effect of the rotor system. The low torsional stiffness shaft 24 is made of aluminum alloy. The low torsional stiffness shaft 24 forms a detachable and replaceable structure. By changing the diameter and length of the shaft, its torsional stiffness can be adjusted, and finally the torsional modal frequency of the bending-torsion coupling rotor can be adjusted. The disk shaft expansion sleeve 29 tightens the rotating shaft 34 inwardly and expands the second wheel disc 30 outwardly, and locates and transmits the load between the second wheel disc 30 and the rotating shaft 34 in the axial direction through friction.

[0058] The axial position of the second wheel disc 30 is adjustable to change the transverse modal vibration shape and frequency of the bending-torsion coupling rotor. The second wheel disc 30 is provided with an unbalanced threaded hole, which allows screws to be screwed in to change the unbalanced state of the rotor.

[0059] Furthermore, both ends of the rotating shaft 34 are connected to the test bench 40 through a first supporting structure and a second supporting structure respectively, and the lateral excitation device part 20 and the second wheel disc 30 are located between the first and second supporting structures.

[0060] The first supporting structure and the second supporting structure are identical in construction:

[0061] The first supporting structure includes a ball bearing 27, a first supporting bearing expansion sleeve 26, a first supporting bearing seat 28, a first bearing seat adapter flange 44, a first load-bearing frame 43 and a first support seat 42. The inner ring of the ball bearing 27 is connected to the rotating shaft 34 through the first supporting bearing expansion sleeve 26, and the outer ring of the ball bearing 27 is fixed to the test bench 40 through the first supporting bearing seat 28, the first bearing seat adapter flange 44, the first load-bearing frame 43 and the first support seat 42 in sequence;

[0062] The second supporting structure includes a roller bearing 32, a second supporting bearing expansion sleeve 31, a second supporting bearing seat 33, a second bearing seat adapter flange 47, a second load-bearing frame 46, and a second support 45. The inner ring of the roller bearing 32 is connected to the rotating shaft 34 through the expansion sleeve 31, and the outer ring thereof is fixed to the test bench 40 through the second supporting bearing seat 33, the second bearing seat adapter flange 47, the second load-bearing frame 46, and the second support 45 in sequence.

[0063] The first load-bearing frame 43 is connected to the first support 42 by bolts, and the second load-bearing frame 46 is connected to the second support 45 by bolts. The positions of the ball bearing 27 and the roller bearing 32 of the rotating shaft 34 are adjustable to change the transverse modal frequency of the bending-torsion coupling rotor.

[0064] refer to Figure 1 , Figure 2 , Figure 3 , the lateral excitation device part 20 includes two top rod type exciters, namely: a first top rod type exciter 51A and a second top rod type exciter 51B;

[0065] The output ends of the two mandrel-type vibration exciters are respectively fixedly connected to the first threaded mandrel 52A and the second threaded mandrel 52B;

[0066] The ends of the first threaded push rod 52A and the second threaded push rod 52B are both connected to the push rod bearing seat 53, and the push rod bearing seat 53 is rotatably connected to the rotating shaft 34 through the push rod bearing 54;

[0067] The first threaded push rod 52A and the second threaded push rod 52B are perpendicular to each other and both are located in the radial direction of the rotating shaft 34 .

[0068] The push rod bearing 54 is connected to the rotating shaft 34 through a tightening sleeve 55. Preferably, the push rod vibrator 51B and the second threaded push rod 52B are located in a horizontal direction, while the first push rod vibrator 51A and the first threaded push rod 52A are located in a vertical direction.

[0069] Furthermore, the lateral excitation device part 20 also includes a first signal generator, a first power amplifier and a second power amplifier;

[0070] The first signal generator is connected to the first power amplifier and the second power amplifier. The first power amplifier is connected to the first top-rod vibration exciter 51A. The second power amplifier is connected to the second top-rod vibration exciter 51B.

[0071] The first signal generator can output two vibration signals, which are connected to the first power amplifier and the second power amplifier respectively. The first power amplifier outputs power to the top rod exciter 51A, and finally drives the rotating shaft 34 to vibrate in the vertical direction. The second power amplifier outputs power to the top rod exciter 51B, and finally drives the rotating shaft 34 to vibrate in the horizontal direction. Obviously, the superposition of the vibrations in the vertical and horizontal directions makes the axis of the rotating shaft 34 have a specific trajectory. If the displacement vibrations excited by the adjustment of the rotating shaft 34 in the vertical and horizontal directions are simple harmonic, and the frequency is the same, the amplitude is equal, and the phase difference is 90°, then the axis trajectory of the rotating shaft 34 is positive or negative precession, and at this time the lateral excitation device forms positive or negative precession excitation on the rotor. The waveform, frequency, and amplitude of the applied lateral excitation can be customized.

[0072] refer to Figure 1 , Figure 2 , Figure 5 , the torsional vibration excitation device part 60 includes a torsional vibration excitation coupling 61 and a torsional vibration exciter 62;

[0073] The torsional vibration exciter 62 is connected to the rotating shaft 34 via the torsional vibration excitation coupling 61 .

[0074] Furthermore, the torsional vibration excitation device part 60 also includes a second signal generator and a third power amplifier; the second signal generator is connected to the third power amplifier, and the third power amplifier is connected to the torsional vibration exciter 62.

[0075] Preferably, the torsional excitation coupling 61 is a diaphragm coupling. The second signal generator outputs a signal formed by the superposition of a simple harmonic fluctuating voltage signal and a DC voltage signal. The signal is input into the third power amplifier, and the third power amplifier then outputs an amplified voltage. The amplified DC voltage output is used to resist the electromotive force formed by the torsional exciter 62 (DC motor) being driven by the active motor 11, and the amplified fluctuating voltage output is used to form a fluctuating torque, causing torsional excitation to the bend-torsion coupling rotor 20. The waveform, frequency, and amplitude of the applied torsional excitation can be customized. Preferably, the model of the power amplifier is ATA-309C manufactured by Xi'an Antai Electronics.

[0076] refer to Figure 4 , a method for partially applying circular precession excitation to a lateral excitation device, comprising the following steps:

[0077] The first step is to close the torsional excitation device part 60;

[0078] The second step is to give the angular frequency and amplitude of the circular precession trajectory;

[0079] The third step is to set the first signal generator to output two simple harmonic signals with phase difference to the first and second power amplifiers;

[0080] In the fourth step, the first and second power amplifiers are respectively set to corresponding amplification factors, and output power signals to the two top-rod vibrators, so that the rotating shaft 34 is stimulated to precess.

[0081] refer to Figure 6 , a method for partially applying torsional excitation to a torsional excitation device, comprising the following steps:

[0082] The first step is to close the lateral vibration excitation device part 20 and disconnect the torsional vibration exciter connection;

[0083] The second step is to drive the car to a set speed;

[0084] The third step is to measure the voltage across the torsional exciter 62, which is recorded as V1;

[0085] Step 4: Set the DC voltage amplitude of the second signal generator and the power generator amplification factor so that the output DC voltage amplitude is equal to V1;

[0086] Step 5, the second signal generator signal is superimposed with a simple harmonic vibration signal of a given frequency;

[0087] Step 6: Connect the torsional exciter 62 to the third power amplifier;

[0088] In the seventh step, the torsional exciter 62 outputs a fluctuating torque.

[0089] The embodiments described above are only descriptions of the preferred modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, modifications, and substitutions made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A bending-torsion coupled rotor test device capable of applying lateral and torsional excitation, characterized in that: It comprises a driving device part (10), a bending-torsion coupling rotor part (20), a lateral vibration exciting device part (20) and a torsional vibration exciting device part (60); The bending-torsion coupling rotor part (20) comprises a first wheel disc (21), a second wheel disc (30), a rotating shaft (34), a low torsional stiffness shaft (24), a torque sensor (22), and a matching coupling, bearing, and support structure; the second wheel disc (30) is arranged on the rotating shaft (34); The lateral excitation device part (20) is arranged beside the second wheel disc (30), and the lateral excitation device part (20) is used to apply excitation to the rotating shaft (34) along two mutually perpendicular radial directions to generate vibration, thereby causing the rotating shaft (34) to precess eccentrically, and the precession trajectory is a perfect circle; One end of the rotating shaft (34) away from the driving device part (10) is connected to the torsional vibration excitation device part (60), and the torsional vibration excitation device part (60) is used to apply torque to the rotational circumference of the rotating shaft (34); the other end of the rotating shaft (34) is connected to the driving device part (10) via a low torsional stiffness shaft (24), a torque sensor (22), and a first wheel (21).

2. The bending-torsion coupled rotor testing device capable of applying lateral and torsional excitation according to claim 1, characterized in that: The driving device part (10) comprises a motor (11) and a motor coupling (12); a motor shaft head (11A) of the motor (11) is connected to one end of the motor coupling (12), and the other end of the motor coupling (12) is connected to the first wheel (21).

3. The bending-torsion coupled rotor testing device capable of applying lateral and torsional excitation according to claim 1, characterized in that: The first wheel (21) is connected to one end of a low torsional stiffness shaft (24) via a torque sensor (22) and a first coupling (23) in sequence; the other end of the low torsional stiffness shaft (24) is connected to the rotating shaft (34) via a second coupling (25); and the second wheel (30) is sleeved on the rotating shaft (34) via a wheel expansion sleeve (29).

4. The bending-torsion coupled rotor testing device capable of applying lateral and torsional excitation according to claim 1, characterized in that: The two ends of the rotating shaft (34) are connected to the test bench (40) through a first supporting structure and a second supporting structure respectively, and the lateral vibration excitation device part (20) and the second wheel disc (30) are located between the first and second supporting structures.

5. The bending-torsion coupled rotor testing device capable of applying lateral and torsional excitation according to any one of claims 1 to 4, characterized in that: The lateral vibration excitation device part (20) comprises two top rod type vibration exciters, namely: a first top rod type vibration exciter (51A) and a second top rod type vibration exciter (51B); The output ends of the two mandrel-type vibration exciters are respectively fixedly connected to a first threaded mandrel (52A) and a second threaded mandrel (52B); The ends of the first threaded push rod (52A) and the second threaded push rod (52B) are both connected to a push rod bearing seat (53), and the push rod bearing seat (53) is rotatably connected to the rotating shaft (34) via a push rod bearing (54); The first threaded push rod (52A) and the second threaded push rod (52B) are perpendicular to each other and both are located in the radial direction of the rotating shaft (34).

6. The bending-torsion coupled rotor testing device capable of applying lateral and torsional excitation according to claim 5, characterized in that: The lateral excitation device part (20) also includes a first signal generator, a first power amplifier and a second power amplifier; The first signal generator is connected to the first power amplifier and the second power amplifier, the first power amplifier is connected to the first top-rod vibration exciter (51A), and the second power amplifier is connected to the second top-rod vibration exciter (51B).

7. The bending-torsion coupled rotor testing device capable of applying lateral and torsional excitation according to any one of claims 1 to 4, characterized in that: The torsional vibration excitation device part (60) comprises a torsional vibration excitation coupling (61) and a torsional vibration exciter (62); The torsional vibration exciter (62) is connected to the rotating shaft (34) via the torsional vibration excitation coupling (61).

8. The bending-torsion coupled rotor testing device capable of applying lateral and torsional excitation according to claim 7, characterized in that: The torsional vibration excitation device part (60) also includes a second signal generator and a third power amplifier; the second signal generator is connected to the third power amplifier, and the third power amplifier is connected to the torsional vibration exciter (62).

9. A method for partially applying circular precession excitation to a lateral excitation device, applied to the bending-torsion coupled rotor test device capable of applying lateral and torsional excitation as claimed in claim 6, characterized in that: The following steps are involved: The first step is to close the torsional vibration excitation device part (60); The second step is to give the angular frequency and amplitude of the circular precession trajectory; The third step is to set the first signal generator to output two simple harmonic signals with phase difference to the first and second power amplifiers; In the fourth step, the first and second power amplifiers are respectively set to corresponding amplification factors, and output power signals to two top-rod vibrators, so that the rotating shaft (34) is stimulated to precess.

10. A method for partially applying torsional excitation to a torsional excitation device, applied to the bending-torsion coupled rotor test device capable of applying lateral and torsional excitation as claimed in claim 8, characterized in that: The following steps are involved: The first step is to close the lateral vibration excitation device part (20) and disconnect the torsional vibration exciter connection; The second step is to drive the car to a set speed; The third step is to measure the voltage across the torsional exciter (62), which is recorded as V1; Step 4: Set the DC voltage amplitude of the second signal generator and the power generator amplification factor so that the output DC voltage amplitude is equal to V1; Step 5, the second signal generator signal is superimposed with a simple harmonic vibration signal of a given frequency; Step 6: Connect the torsional exciter (62) to the third power amplifier; In the seventh step, the torsional vibration exciter (62) outputs a fluctuating torque.

Images