Vibration excitation device, use method of vibration excitation device and vibration reduction device

Abstract

The invention discloses a vibration excitation device, a use method of the vibration excitation device and a vibration damper, and relates to the technical field of vibration control. The simple pendulum excitation mechanism comprises a swing rod and a mass block connected with one end of the swing rod, and the other end of the swing rod is rotatably connected to the cross beam; and the frequency modulation mechanism is movably connected with the swing rod, and the frequency modulation mechanism is used for moving in the axial direction of the swing rod to change the swing length of the simple pendulum excitation mechanism so as to adjust the inherent frequency of the simple pendulum excitation mechanism. The inherent frequency of the simple pendulum excitation mechanism is actively adjusted through the frequency adjustment mechanism, the frequency adjustment range is wide, adjustment is convenient, and the multi-order modal frequency of a bridge can be comprehensively covered.

Description

Technical Field

[0001] This invention relates to the field of vibration control technology, specifically to a vibration excitation device, a method of using the vibration excitation device, and a vibration reduction device. Background Technology

[0002] Currently, modal identification of bridge structures is an important means of assessing the dynamic characteristics and structural health of long-span bridges. In tests on long-span bridges (such as suspension bridges and cable-stayed bridges), artificial vibration is often required to induce lateral vibrations in the structure in order to determine its natural frequencies and mode shapes. The lateral vibrator is a key piece of equipment in modal testing, and its performance directly affects the accuracy and comprehensiveness of the test results. Existing bridge lateral vibration devices mainly fall into two categories: rotating eccentric mass vibrators and actuator-driven vibrators. The former generates periodic lateral inertial forces by rotating an eccentric mass through a motor, while the latter uses hydraulic or electric actuators to reciprocate and vibrate the mass mass.

[0003] However, the rotating eccentric mass exciter has a relatively simple structure, and its excitation frequency is determined by the rotational speed, which is usually difficult to fix or adjust, and cannot cover the multi-order modal frequencies of the bridge. Although the excitation frequency of the actuator-driven exciter is adjustable within a certain range, its maximum output excitation force is limited due to the small movable mass, making it difficult to effectively excite low-frequency, large-mass bridge modes. Summary of the Invention

[0004] This invention provides a vibration excitation device, a method for using the vibration excitation device, and a vibration reduction device, which can solve the problem that existing vibrators are difficult to adjust in frequency and cannot meet the requirements of bridge multimodal identification tests.

[0005] In a first aspect, embodiments of the present invention provide a vibration excitation device, comprising: Support frame, wherein the support frame is provided with a crossbeam; A pendulum excitation mechanism, comprising a pendulum rod and a mass block connected to one end of the pendulum rod, the other end of the pendulum rod being rotatably connected to a crossbeam; A frequency modulation mechanism is movably connected to the pendulum rod. The frequency modulation mechanism is used to move along the axial direction of the pendulum rod to change the pendulum length of the pendulum excitation mechanism, so as to adjust the natural frequency of the pendulum excitation mechanism.

[0006] In conjunction with the first aspect, in one embodiment, the support frame includes: A base plate and a first column and a second column, one end of which is fixedly connected to the base plate; The other ends of the first and second columns are respectively fixedly connected to the crossbeam.

[0007] In conjunction with the first aspect, in one embodiment, the frequency modulation mechanism includes: The first tension spring assembly includes a first tension spring and a first adjustment unit connected to one end of the first tension spring. The first adjustment unit is fixedly connected to the first column, and the first tension spring assembly is movably connected to the swing arm through the other end of the first tension spring. The second tension spring assembly includes a second tension spring and a second adjustment unit connected to one end of the second tension spring. The second adjustment unit is fixedly connected to the second column, and the second tension spring assembly is movably connected to the swing arm through the other end of the second tension spring.

[0008] In conjunction with the first aspect, in one embodiment, the first adjustment unit and the second adjustment unit include: The first servo motor and the second servo motor are fixedly connected to the first column and the second column, respectively. The first ball screw shaft and the second ball screw lever shaft are respectively fixedly connected at one end to the output end of the first servo motor and the second servo motor.

[0009] Two ball nuts are respectively sleeved on the first ball screw shaft and the second ball screw shaft. The first servo motor and the second servo motor drive the first ball screw shaft and the second ball screw lever shaft to rotate, so as to drive the two ball nuts to move axially along the first ball screw shaft and the second ball screw lever shaft respectively.

[0010] In conjunction with the first aspect, in one implementation, it further includes: An actuator, wherein the base of the actuator is fixedly connected to the first column, and the piston rod end of the actuator is movably connected to the mass block; The reciprocating motion of the actuator causes the mass block to oscillate periodically.

[0011] In conjunction with the first aspect, in one implementation, it further includes: An inertia amplification mechanism includes a flywheel and a transmission mechanism connected to the flywheel. The transmission mechanism is also connected to the mass block, and the mass block drives the flywheel to rotate through the transmission mechanism.

[0012] In conjunction with the first aspect, in one embodiment, the transmission mechanism includes: A primary crank, which is fixedly connected to the mass block; A second-stage connecting rod, one end of which is rotatably connected to the first-stage crank; A secondary slider, wherein the secondary slider is rotatably connected to the other end of the secondary connecting rod; A third-stage crank is fixedly connected to the second-stage slider, and the third-stage crank is limited to linear motion along its axial direction. When the mass block oscillates periodically, it drives the third-stage crank to perform reciprocating linear motion, and the third-stage crank then drives the flywheel to perform circular motion.

[0013] In conjunction with the first aspect, in one embodiment, the transmission mechanism further includes: The variable speed gear set adjusts the rotational speed of the flywheel by adjusting the ratio of the number of gears in the gear set to the number of large and small gears.

[0014] Secondly, embodiments of the present invention provide a method for using a vibration excitation device, comprising the following steps: The pendulum length of the pendulum excitation mechanism is changed by moving the pendulum rod along the axis of the pendulum excitation mechanism using a frequency modulation mechanism, thereby adjusting the natural frequency of the pendulum excitation mechanism.

[0015] Thirdly, embodiments of the present invention provide a vibration damping device, including the excitation device as described in claim 1.

[0016] The beneficial effects of the technical solutions provided by the embodiments of the present invention include: This invention discloses a vibration excitation device, a method for using the vibration excitation device, and a vibration reduction device. The vibration excitation device includes: a support frame with a crossbeam; a pendulum vibration excitation mechanism, comprising a pendulum rod and a mass block connected to one end of the pendulum rod, the other end of the pendulum rod being rotatably connected to the crossbeam; and a frequency tuning mechanism movably connected to the pendulum rod, the frequency tuning mechanism being used to move along the axial direction of the pendulum rod to change the pendulum length of the pendulum vibration excitation mechanism, thereby adjusting the natural frequency of the pendulum vibration excitation mechanism. This invention actively adjusts the natural frequency of the pendulum vibration excitation mechanism through the frequency tuning mechanism, providing a wide frequency adjustment range and convenient adjustment, and can comprehensively cover the multi-mode frequencies of bridges. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the excitation device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the single pendulum excitation mechanism of the excitation device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the support frame structure of the vibration excitation device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the frequency modulation mechanism of the excitation device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the inertia amplification mechanism of the excitation device according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the actuator structure of the excitation device according to an embodiment of the present invention.

[0019] In the diagram: 10. Support frame; 101. Base plate; 102. First column; 103. Second column; 105. Crossbeam; 20. Single pendulum excitation mechanism; 202. Pendulum rod; 204. Mass block; 30. Frequency modulation mechanism; 31. First tension spring assembly; 32. Second tension spring assembly; 33. First adjustment unit; 34. Second adjustment unit; 305. First tension spring; 306. Second tension spring; 307. Ball nut; 3011. First ball screw shaft; 3012. Second ball screw shaft; 3021. First servo motor; 3022. Second servo motor; 40. Actuator; 401. Foot; 402. Piston rod end; 50. Inertia amplification mechanism; 501. First-stage crank; 504. Second-stage connecting rod; 505. Second-stage slider; 506. Flywheel; 508. Third-stage crank; 510. Transmission mechanism. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: See Figure 1 , 2 As shown in Figure 3, the excitation device includes: a support frame 10, which is provided with a crossbeam 105; a pendulum excitation mechanism 20, which includes a pendulum rod 202 and a mass block 204 connected to one end of the pendulum rod 202, the other end of the pendulum rod 202 being rotatably connected to the crossbeam 105; and a frequency modulation mechanism 30, which is movably connected to the pendulum rod 202 and is used to move along the axial direction of the pendulum rod 202 to change the pendulum length of the pendulum excitation mechanism 20, thereby adjusting the natural frequency of the pendulum excitation mechanism 20.

[0022] The support frame 10 is provided with a crossbeam 105 for supporting the pendulum excitation mechanism 20.

[0023] The pendulum excitation mechanism 20 consists of a pendulum rod 202 and a mass block 204. One end of the pendulum rod 202 is rotatably connected to the crossbeam 105, and the other end is connected to the mass block 204. When the mass block 204 swings, it drives the pendulum rod 202 to swing around the connection point between the pendulum rod 202 and the crossbeam 105 as the base point.

[0024] One end of the swing arm 202 is rotatably connected to the crossbeam 105, which is achieved by a main pivot bearing seat welded to the lower surface of the crossbeam 105 and a main pivot shaft provided on the swing arm 202.

[0025] The mass block 204 can also be a steel box, and a counterweight can be placed inside the box. The counterweight can be added or removed as needed to change the weight of the mass block 204.

[0026] The frequency modulation mechanism 30 is movably connected to the pendulum rod 202 and can move along the axial direction of the pendulum rod 202 to change the pendulum length of the pendulum excitation mechanism 20, thereby adjusting the natural frequency of the pendulum excitation mechanism 20.

[0027] The pendulum length is the vertical distance from the movable connection point between the frequency modulation mechanism 30 and the pendulum rod 202 to the connection point between the pendulum rod 202 and the crossbeam 105.

[0028] In use, the connection position between the frequency modulation mechanism 30 and the pendulum rod 202 is adjusted by adjusting the frequency modulation mechanism 30 to change the pendulum length of the pendulum excitation mechanism 20, thereby adjusting the natural frequency of the pendulum excitation mechanism 20.

[0029] This invention provides a vibration excitation device that adjusts the natural frequency of a single pendulum vibration mechanism by changing the pendulum length through a frequency tuning mechanism that moves along the axial direction of the pendulum rod. This design allows for active adjustment of the vibration device's frequency to meet the requirements of multi-mode identification testing for long-span bridges.

[0030] Example 2: See Figure 1 , 3 As shown, the support frame 10 of the excitation device further includes: a base plate 101 and a first column 102 and a second column 103, one end of which is fixedly connected to the base plate 101; the other ends of the first column 102 and the second column 103 are respectively fixedly connected to the crossbeam 105.

[0031] The base plate 101 is made of steel plate with high-strength bolt holes at the four corners, which are rigidly connected to the steel beams of the bridge deck or the steel plates embedded in the concrete.

[0032] The first column 102 and the second column 103 are welded square steel pipes, with their lower ends fully welded to the base plate 101 and their top ends beveled to the crossbeam 105.

[0033] The present invention provides a support frame for an excitation device, which also includes a base plate and columns. The crossbeam is supported by the first column and the second column to provide space for the pendulum excitation mechanism to swing.

[0034] Example 3: See Figure 1 , 4 As shown, the frequency modulation mechanism 30 of the excitation device includes: a first tension spring assembly 31, which includes a first tension spring 305 and a first adjustment unit 33 connected to one end of the first tension spring 305. The first adjustment unit 33 is fixedly connected to the first column 102, and the first tension spring assembly 31 is movably connected to the swing rod 202 through the other end of the first tension spring 305; and a second tension spring assembly 32, which includes a second tension spring 306 and a second adjustment unit 34 connected to one end of the second tension spring 306. The second adjustment unit 34 is fixedly connected to the second column 103, and the second tension spring assembly 32 is movably connected to the swing rod 202 through the other end of the second tension spring 306.

[0035] The first tension spring 305 and the second tension spring 306 are connected to the rocker arm 202 at the same position, and the first tension spring 306 and the second tension spring 305 have the same axial linear stiffness k.

[0036] The first adjustment unit 33 and the second adjustment unit 34 synchronously adjust their connection positions with the first tension spring 305 and the second tension spring 306, and the connection positions of the first tension spring 305 and the second tension spring 306 with the rocker arm 202 move synchronously with the connection positions of the first adjustment unit 33 and the second adjustment unit 34 with the first tension spring 305 and the second tension spring 306.

[0037] The present invention provides a frequency modulation mechanism for an excitation device, comprising a first tension spring assembly and a second tension spring assembly. The first tension spring and the second tension spring are kept horizontal by the driving of a first adjustment unit and a second adjustment unit, so that the direction of the force provided by the first tension spring and the second tension spring is always consistent.

[0038] Example 4: See Figure 1 , 4As shown, the first adjustment unit 33 and the second adjustment unit 34 of the vibration excitation device include: a first servo motor 3021 and a second servo motor 3022, which are fixedly connected to the first column 102 and the second column 103, respectively; a first ball screw shaft 3011 and a second ball lever shaft 3012, one end of which is fixedly connected to the first servo motor 3021 and the second servo motor 3022, respectively. Two ball nuts 307 are respectively sleeved on the first ball screw shaft 3011 and the second ball screw shaft 3012. The first servo motor 3021 and the second servo motor 3022 drive the first ball screw shaft 3011 and the second ball lever shaft 3012 to rotate, so as to drive the two ball nuts 307 to move axially along the first ball screw shaft 3011 and the second ball lever shaft 3012, respectively.

[0039] The first servo motor 3021 and the second servo motor 3022 are fixedly connected to the first column 102 and the second column 103 respectively, and maintain the same horizontal height.

[0040] When frequency adjustment is required, the first servo motor 3021 and the second servo motor 3022 are started, driving the first ball screw shaft 3011 and the second ball screw shaft 3012 to rotate synchronously, which in turn drives the two ball nuts 307 to move synchronously, always keeping them on the same horizontal plane.

[0041] Furthermore, a third adjustment unit, identical to the first adjustment unit 33 and the second adjustment unit 34, is also fixed on the rocker arm 202. When the frequency needs to be adjusted, the three ball nuts 307 move synchronously and always remain on the same horizontal plane.

[0042] Example 5: See Figure 1 , 6 As shown, the excitation device further includes: an actuator 40, the base 401 of the actuator 40 is fixedly connected to the first column 102, and the piston rod end 402 of the actuator 40 is movably connected to the mass block 204; the reciprocating motion of the actuator 40 drives the mass block 204 to generate periodic oscillation.

[0043] The actuator 40 is the power source that drives the pendulum excitation mechanism 20 to vibrate. The base 401 of the actuator 40 is fixed to the first column 102 by a trunnion hinge, and its piston rod end 402 is movably connected to the mass block 204. The reciprocating motion of the actuator 40 drives the tension spring to extend and retract, causing the pendulum rod-mass block to oscillate periodically.

[0044] Example 6: See Figure 1 , 6 As shown, the excitation device further includes: The inertia amplification mechanism 50 includes a flywheel disk 506 and a transmission mechanism 510 connected to the flywheel disk 506. The transmission mechanism 510 is also connected to the mass block 204, and the mass block 204 drives the flywheel disk 506 to rotate through the transmission mechanism 510.

[0045] Mass block 204 is connected to flywheel disk 506 with large rotational inertia through transmission mechanism 510. When mass block 204 oscillates at a small angle, it moves approximately back and forth in a straight line. Through transmission mechanism 510, the approximately back and forth straight line motion of mass block 204 is converted into the rotation of flywheel disk 506.

[0046] This invention provides a vibration excitation device that, by adding an inertia amplification mechanism, can significantly amplify the rotational inertia and effectively excite low-frequency, high-mass bridge modes.

[0047] Example 7: See Figure 1 , 6 As shown, the excitation device and the transmission mechanism 510 include: a primary crank 501, which is fixedly connected to the mass block 204; a secondary connecting rod 504, one end of which is rotatably connected to the primary crank 501; a secondary slider 505, the other end of which is rotatably connected to the secondary connecting rod 504; and a tertiary crank 508, which is fixedly connected to the secondary slider 505 and is limited to linear motion along its axial direction. When the mass block 204 oscillates periodically, it drives the tertiary crank 508 to perform reciprocating linear motion, and the tertiary crank 508 then drives the flywheel 506 to perform circular motion.

[0048] During excitation, the mass block 204 swings left and right, causing the first-stage crank 501, which is fixedly connected to the mass block 204, to swing left and right together. The end of the second-stage connecting rod 504, rotatably connected to the first-stage crank 501, also swings left and right synchronously. The second-stage connecting rod 504 drives the second-stage slider 505, rotatably connected to the second-stage connecting rod 504, to reciprocate linearly. Furthermore, the second-stage slider 505 is movably connected to a slide rail fixed to the inertia amplification mechanism 50, which restricts the second-stage slider 505 to reciprocating linearly along the slide rail. The second-stage slider 505 drives the third-stage crank 508 to reciprocate linearly. A protruding shank is fixed on the transmission shaft connected to the flywheel 506, and the protruding shank is inserted into an elongated hole on the third-stage crank 508. When the third-stage crank 508 reciprocates linearly, the elongated hole causes the protruding shank to rotate along the axis, and the protruding shank drives the flywheel 506, which has a large rotational inertia, to rotate together via the transmission shaft.

[0049] Example 8: See Figure 1 , 5As shown, the transmission mechanism 510 of the excitation device further includes a speed-changing gear set, which adjusts the rotational speed of the flywheel 506 by adjusting the ratio of the number of gears to the number of large and small gears.

[0050] The transmission gear set consists of multiple sets of gear combinations connected in series, where a large number of driving gears drives a small number of driven gears. The transmission gear set uses these gear combinations to increase the rotational speed of the flywheel 506. Multiple gear combinations allow for multiple amplification of the flywheel 506's rotational speed to meet practical needs. Preferably, the transmission gear set has two such gear combinations.

[0051] The present invention provides an inertia amplification mechanism for an excitation device, which can effectively amplify the rotational speed of the flywheel disk by setting a variable speed gear set to meet the excitation requirements.

[0052] Example 9: See Figure 1 As shown, the method of using the excitation device includes the following steps: using the frequency tuning mechanism 30 to move along the axial direction of the pendulum rod 202 of the pendulum excitation mechanism 20 to change the pendulum length of the pendulum excitation mechanism 20, so as to adjust the natural frequency of the pendulum excitation mechanism 20.

[0053] Example 10: See Figure 1 As shown, the vibration damping device includes the excitation device described in Embodiment 1. The excitation device includes: a support frame 10, which is provided with a crossbeam 105; a pendulum excitation mechanism 20, which includes a pendulum rod 202 and a mass block 204 connected to one end of the pendulum rod 202, the other end of the pendulum rod 202 being rotatably connected to the crossbeam 105; and a frequency modulation mechanism 30, which is movably connected to the pendulum rod 202. The frequency modulation mechanism 30 is used to move along the axial direction of the pendulum rod 202 to change the pendulum length of the pendulum excitation mechanism 20, thereby adjusting the natural frequency of the pendulum excitation mechanism 20.

[0054] The specific working principle of the excitation device in this invention is as follows: In small-angle linear changes:

[0055] When the rocker arm deflects by θ, the spring connection node and the outer frame produce a horizontal relative displacement.

[0056] Each tension spring generates an axial restoring force of

[0057] Its torque about the pivot is

[0058] The device is symmetric about the left and right, and the total rotational torque of the two tension springs is

[0059] The gravitational rotational torque of the classic pendulum is

[0060] Therefore, the total restoring force is

[0061] Therefore, the total equivalent rotational stiffness of the system

[0062] Linearized motion equation and natural frequency The total rotational inertia of the system is

[0063] Using Newton-Euler or Lagrange method, the differential equation of small-amplitude free vibration can be obtained:

[0064] Therefore, the natural angular frequency:

[0065] Corresponding frequency:

[0066] It can be seen from the above formula that the natural frequency increases monotonically with the increase of x. Therefore, the pendulum-type inertia amplification exciter with active frequency modulation in this paper can adjust the position of the ball screw through the servo motor to adjust the excitation frequency of the exciter.

[0067] In the above formula, m is the mass of the mass block 204. Only the mass block 204 at the lower end of the pendulum rod is considered, and the self-weights of the other rods are omitted; l is the geometric length of the pendulum rod, x is the pendulum length from the active connection points of the first tension spring 305 and the second tension spring 306 to the connection point of the pendulum rod 202 and the cross beam 105, 0 < x ≤ l; k is the axial linear stiffness of the single-sided tension spring, one on each side, with the same parameters; J f is the equivalent rotational inertia of the flywheel; I is the total rotational inertia of the system; θ is the pendulum angle, positive in the clockwise direction; g is the gravitational constant, g = 9.8 m / s2.

[0068] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0069] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0070] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A vibration excitation device, characterized in that, It includes: Support frame (10), the support frame (10) is provided with crossbeam (105); A pendulum excitation mechanism (20) includes a pendulum rod (202) and a mass block (204) connected to one end of the pendulum rod (202). The other end of the pendulum rod (202) is rotatably connected to a crossbeam (105). Frequency modulation mechanism (30) is movably connected to the pendulum rod (202). The frequency modulation mechanism (30) is used to move along the axial direction of the pendulum rod (202) to change the pendulum length of the pendulum excitation mechanism (20) in order to adjust the natural frequency of the pendulum excitation mechanism (20).

2. The excitation device according to claim 1, characterized in that, The support frame (10) includes: The base plate (101) and the first column (102) and the second column (103) are fixedly connected to the base plate (101) at one end. The other ends of the first column (102) and the second column (103) are respectively fixedly connected to the crossbeam (105).

3. The excitation device according to claim 2, characterized in that, The frequency modulation mechanism (30) includes: The first tension spring assembly (31) includes a first tension spring (305) and a first adjustment unit (33) connected to one end of the first tension spring (305). The first adjustment unit (33) is fixedly connected to the first column (102), and the first tension spring assembly (31) is movably connected to the swing rod (202) through the other end of the first tension spring (305). The second tension spring assembly (32) includes a second tension spring (306) and a second adjustment unit (34) connected to one end of the second tension spring (306). The second adjustment unit (34) is fixedly connected to the second column (103), and the second tension spring assembly (32) is movably connected to the swing rod (202) through the other end of the second tension spring (306).

4. The excitation device according to claim 3, characterized in that, The first adjustment unit (33) and the second adjustment unit (34) include: The first servo motor (3021) and the second servo motor (3022) are fixedly connected to the first column (102) and the second column (103) respectively; The first ball screw shaft (3011) and the second ball screw lever shaft (3012) are respectively fixedly connected at one end to the output end of the first servo motor (3021) and the second servo motor (3022). Two ball nuts (307) are respectively sleeved on the first ball screw shaft (3011) and the second ball screw shaft (3012). The first servo motor (3021) and the second servo motor (3022) drive the first ball screw shaft (3011) and the second ball screw lever shaft (3012) to rotate, so as to drive the two ball nuts (307) to move axially along the first ball screw shaft (3011) and the second ball screw lever shaft (3012) respectively.

5. The excitation device according to claim 1, characterized in that, Also includes: Actuator (40), the base (401) of the actuator (40) is fixedly connected to the first column (102), and the piston rod end (402) of the actuator (40) is movably connected to the mass block (204); The reciprocating motion of the actuator (40) causes the mass block (204) to oscillate periodically.

6. The excitation device according to claim 1, characterized in that, Also includes: An inertia amplification mechanism (50) includes a flywheel disk (506) and a transmission mechanism (510) connected to the flywheel disk (506). The transmission mechanism (510) is also connected to the mass block (204), and the mass block (204) drives the flywheel disk (506) to rotate through the transmission mechanism (510).

7. The excitation device according to claim 6, characterized in that, The transmission mechanism (510) includes: A first-stage crank (501) is fixedly connected to the mass block (204); A second-stage connecting rod (504), one end of which is rotatably connected to the first-stage crank (501); A secondary slider (505) is rotatably connected to the other end of the secondary connecting rod (504); The third-stage crank (508) is fixedly connected to the second-stage slider (505), and the third-stage crank (508) is limited to linear motion along its axial direction. When the mass block (204) oscillates periodically, it drives the three-stage crank (508) to perform reciprocating linear motion, and the three-stage crank (508) then drives the flywheel (506) to perform circular motion.

8. The excitation device according to claim 7, characterized in that, The transmission mechanism (510) further includes: The speed of the flywheel (506) is adjusted by adjusting the ratio of the number of gears to the number of large and small gears.

9. A method of using the excitation device according to claim 1, characterized in that, Includes the following steps: The frequency modulation mechanism (30) is used to move along the axial direction of the pendulum rod (202) of the pendulum excitation mechanism (20) to change the pendulum length of the pendulum excitation mechanism (20) in order to adjust the natural frequency of the pendulum excitation mechanism (20).

10. A vibration damping device, characterized in that, Includes the excitation device as described in claim 1.

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