Drill rod damping device based on semi-active nonlinear energy trap

Abstract

The invention relates to the technical field of drill rod vibration reduction, in particular to a drill rod vibration reduction device based on a semi-active nonlinear energy trap. In order to solve the problem that a traditional active non-linear energy trap vibration suppression structure cannot be suitable for vibration reduction during deep hole machining, the novel drill rod vibration reduction device based on the semi-active non-linear energy trap is provided and comprises a connecting base, an NES mechanism and a PID controller. The NES mechanism comprises two flexible hinges, two mass blocks, a left elastic auxiliary beam, an elastic main beam and a right elastic auxiliary beam, the left elastic auxiliary beam is composed of two left semi-arcs, the two left semi-arcs are distributed at the axial left end in the annular groove in a front-back mode, the right elastic auxiliary beam is composed of two right semi-arcs, the two right semi-arcs are distributed at the axial right end in the annular groove in a front-back mode, and the two right semi-arcs are distributed at the axial left end in the annular groove in a front-back mode. The elastic main beam is composed of two main semicircles, and the two main semicircles are distributed in the axial middle of the interior of the annular groove in a front-and-back mode. The device is simple in structure and obvious in damping effect.

Description

Technical Field

[0001] The present invention relates to the technical field of drill pipe vibration reduction, and specifically to a drill pipe vibration reduction device based on a semi-active non-linear energy sink. Background Art

[0002] During the deep hole machining process, when the length-diameter ratio of the machined hole is relatively large, the drill pipe is prone to chatter, which will cause a significant decline in the machining quality of the part. In severe cases, the part may even be directly scrapped. Therefore, the research on the mechanical vibration control method of the drill pipe is particularly important. As the main factors affecting machining accuracy, tool durability and cutting efficiency, the main reasons for the formation of drill pipe vibration are as follows: when drilling a deep hole with a relatively large length-diameter ratio, the drill pipe is relatively slender, equivalent to a cantilever beam, with weak bending stiffness; the self-weight of the tool bar and the imbalance of the cutting forces between the cutting edges; the poor stiffness of the power transmission system; the unevenness of the workpiece material, etc.

[0003] To effectively suppress the vibration of the drill pipe system, the currently mainly adopted methods are damping vibration reduction and vibration absorption technologies. Among them, the non-linear energy sink has remarkable effects in non-linear passive vibration suppression. The traditional non-linear energy sink is a passive control technology and has remarkable effects in vibration suppression. It mainly consists of three parts, namely a lighter additional mass, a strong non-linear stiffness and a damping element. The mechanism of energy transfer between the non-linear energy sink and the main structure is targeted energy transfer, which has the characteristics of fast transfer speed and unidirectionality (irreversibility). However, the vibration suppression structure of the traditional active non-linear energy sink is relatively complex and has certain limitations in application. For example, during deep hole machining, the environment is narrow, sealed and complex, and the vibration suppression structure of the traditional active non-linear energy sink cannot be applied and has poor vibration suppression effect. Summary of the Invention

[0004] In order to solve the problem that the vibration suppression structure of the traditional active non-linear energy sink cannot be applied to vibration reduction during deep hole machining and has poor vibration suppression effect, the present invention provides a new drill pipe vibration reduction device based on a semi-active non-linear energy sink.

[0005] The present invention is realized by adopting the following technical solutions: A drill pipe vibration damping device based on a semi-active non-linear energy sink, comprising a columnar connection base, a strip-shaped mounting plate, a NES mechanism, and a PID controller. An annular groove is formed in the axial middle of the connection base, and mounting grooves are respectively formed at the top parts of the two side walls of the annular groove. The mounting plate is placed in the annular groove and its two ends are respectively fixed in the two mounting grooves. The NES mechanism includes two square flexible frames, two piezoelectric ceramic stacks, two mass blocks, a left elastic auxiliary beam, an elastic main beam, and a right elastic auxiliary beam. The two piezoelectric ceramic stacks are respectively placed in the two flexible frames to form two flexible hinges. The two flexible hinges are distributed front and back in the axial middle of the mounting plate, and their telescopic deformation directions are arranged circumferentially. The left elastic auxiliary beam is composed of two left semi-circular arcs, and the two left semi-circular arcs are distributed front and back at the axial left end in the annular groove. Left strain gauges are arranged on both of the two left semi-circular arcs. The upper ends of the two left semi-circular arcs are respectively fixed to the front and back ends of the left end of the mounting plate. The left side surfaces of the two flexible frames are respectively fixedly connected to the right side surfaces of the upper ends of the two left semi-circular arcs. A left spacing is provided between the lower ends of the two left semi-circular arcs. The right elastic auxiliary beam is composed of two right semi-circular arcs, and the two right semi-circular arcs are distributed front and back at the axial right end in the annular groove. Right strain gauges are arranged on both of the two right semi-circular arcs. The upper ends of the two right semi-circular arcs are respectively fixed to the front and back ends of the right end of the mounting plate. The right side surfaces of the two flexible frames are respectively fixedly connected to the left side surfaces of the upper ends of the two right semi-circular arcs. A right spacing is provided between the lower ends of the two right semi-circular arcs. The elastic main beam is composed of two main semi-circular arcs, and the two main semi-circular arcs are distributed front and back in the axial middle of the annular groove. Main strain gauges are arranged on both of the two main semi-circular arcs. The upper ends of the two main semi-circular arcs are respectively fixedly connected to the front and back side surfaces of the flexible frame. An axial spacing is provided between the left elastic auxiliary beam, the elastic main beam, and the right elastic auxiliary beam. A radial spacing is provided between the left elastic auxiliary beam, the elastic main beam, and the right elastic auxiliary beam and the bottom of the annular groove of the connection base. The two mass blocks are respectively fixed between the lower end of the left elastic auxiliary beam and the lower end of the elastic main beam, and between the lower end of the elastic main beam and the lower end of the right elastic auxiliary beam. The input end of the PID controller receives the signals of the left strain gauge, the right strain gauge, and the main strain gauge, and the output end of the PID controller controls the piezoelectric ceramic stack to drive the flexible frame to expand and contract and deform.

[0006] Working principle: In the NES mechanism described in the present invention, the elastic main beam acts as a non-linear spring, and the damping elements are the left elastic auxiliary beam and the right elastic auxiliary beam. During use, one end of the columnar connection base is connected to the drill pipe, and the other end is connected to the drill bit. When the drill pipe vibrates within a certain frequency band, the left strain gauge and the right strain gauge detect the existing vibration signal and transmit the vibration signal to the PID controller. The PID controller outputs a certain voltage to the piezoelectric ceramic stack according to the vibration magnitude, and then drives the flexible frame to push the elastic main beam to generate a bending deflection, adjusting the elastic main beam to the non-linear stiffness suitable for vibration suppression at this moment. The main strain gauge feeds back the stiffness value of the elastic main beam detected to the PID controller. When the bending deflection of the elastic main beam reaches the requirement, driving the flexible frame through the piezoelectric ceramic stack is stopped. When the bending deflection of the elastic main beam does not reach the requirement, due to the reduction of vibration energy at this time, the non-linear vibration will escape from the vibration suppression range of the existing non-linear stiffness. The left strain gauge and the right strain gauge will detect the vibration situation again and repeat the above process until the bending deflection of the elastic main beam reaches the requirement, and then driving the flexible frame through the piezoelectric ceramic stack is stopped.

[0007] Furthermore, the front and rear sides of the two flexible frames are both in a V shape, which is convenient for telescopic deformation.

[0008] Furthermore, a vertical partition is provided in the middle of the mounting plate in the front and rear directions. The left end and the right end of the mounting plate are respectively fixed with a left limiting plate and a right limiting plate. The left and right ends of the vertical partition are respectively fixed to the middle of the front and rear directions of the left limiting plate and the middle of the front and rear directions of the right limiting plate. The two flexible hinges are respectively located on the front and rear sides of the vertical partition. The upper ends of the two left semi-circular arcs are both fixed with left connecting plates. The left side surfaces of the two left connecting plates are respectively in close contact with the front and rear ends of the right side surface of the left limiting plate. The front / rear side surfaces of the two left connecting plates are respectively in close contact with the front and rear side surfaces of the left end of the vertical partition. The upper ends of the two right semi-circular arcs are both fixed with right connecting plates. The right side surfaces of the two right connecting plates are respectively in close contact with the front and rear ends of the left side surface of the right limiting plate. The front / rear side surfaces of the two right connecting plates are respectively in close contact with the front and rear side surfaces of the right end of the vertical partition. The structure is more stable, specific, and standardized.

[0009] Furthermore, left semi-circular grooves are provided on the outer side surfaces of the lower ends of the two left semi-circular arcs, right semi-circular grooves are provided on the outer side surfaces of the lower ends of the two right semi-circular arcs, middle semi-circular grooves are provided on the inner side surfaces of the lower ends of the two main semi-circular arcs, connecting round holes are provided at the front and rear ends of the two mass blocks, and the left semi-circular grooves, the connecting round holes, the middle semi-circular grooves, and the right semi-circular grooves are arranged in a matching manner. The two connecting rods respectively pass through the corresponding left semi-circular grooves, connecting round holes, middle semi-circular grooves, and right semi-circular grooves to realize the connection of the two mass blocks with the elastic main beam, the corresponding left elastic auxiliary beam, and the corresponding right elastic auxiliary beam. The structure is specific, standardized, and convenient for installation and disassembly.

[0010] Furthermore, the entire NES mechanism is located within the annular groove, occupying a small space and being suitable for the deep-hole environment, thus avoiding the complexity and bulkiness of the overall structure that are not applicable to the deep-hole machining environment.

[0011] Furthermore, the left end of the connecting base is provided with an external thread for connecting to the drill pipe, and the right end of the connecting base is provided with an internal thread for connecting to the drill bit, facilitating installation and disassembly during use.

[0012] The beneficial effects of the present invention are as follows: Based on the semi-active non-linear energy sink, the present invention can effectively dissipate the energy generated by the vibration of the drill pipe, and the vibration suppression effect is relatively significant. The non-linear stiffness in the semi-active non-linear energy sink can ensure internal resonance with the main structure, and good vibration suppression ability can be achieved within a relatively wide frequency band. The present invention is reasonably designed, has a simple structure, occupies a small space, effectively reduces the vibration of the drill pipe, improves the machining quality of the workpiece, and provides new ideas and methods for vibration suppression during deep-hole machining. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present invention and, together with the specification, are used to explain the principles of the present invention.

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the connector structure; Figure 3 is a schematic diagram of the mounting plate structure; Figure 4 is a schematic diagram of the NES mechanism; Figure 5 is a schematic diagram of the structure of the left semi-circular arc, right semi-circular arc, main semi-circular arc and the connecting rod; Figure 6 is a schematic diagram of the structure of the left mass block / right mass block; Figure 7 is a simulation of the free vibration attenuation of the drill pipe with the NES component described in the present invention; Figure 8 is a schematic diagram of the amplitudes of the drill pipe with and without the NES component described in the present invention.

[0016] In the figure: 1 - connecting base, 2 - mounting plate, 3 - annular groove, 4 - mounting groove, 5 - flexible hinge, 6 - mass block, 7 - left elastic auxiliary beam, 8 - right elastic auxiliary beam, 9 - elastic main beam, 10 - vertical partition board, 11 - left limit plate, 12 - right limit plate, 13 - left connecting plate, 14 - right connecting plate, 15 - connecting rod. Detailed implementation manners

[0017] In order to more clearly understand the above objects, features and advantages of the present invention, the solution of the present invention will be further described below. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0018] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should be noted that unless otherwise clearly defined and limited, the terms "mount", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0019] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] As Figures 1 to 6As shown in the figure, a drill pipe vibration damping device based on a semi-active non-linear energy sink includes a columnar connection base 1, a strip-shaped mounting plate 2, a NES mechanism, and a PID controller. An annular groove 3 is formed in the axial middle of the connection base 1. Mounting grooves 4 are respectively formed at the top parts of the two side walls of the annular groove 3. The mounting plate 2 is placed in the annular groove 3 and its two ends are respectively fixed in the two mounting grooves 4. The NES mechanism includes two square flexible frames, two piezoelectric ceramic stacks, two mass blocks 6, a left elastic sub-beam 7, an elastic main beam 9, and a right elastic sub-beam 8. The two piezoelectric ceramic stacks are respectively placed in the two flexible frames to form two flexible hinges 5. The two flexible hinges 5 are distributed front and back in the axial middle of the mounting plate 2 and their telescopic deformation directions are arranged circumferentially. The left elastic sub-beam 7 is composed of two left semi-circular arcs. The two left semi-circular arcs are distributed front and back at the axial left end in the annular groove 3. Left strain gauges are provided on both of the two left semi-circular arcs. The upper ends of the two left semi-circular arcs are respectively fixed to the front and rear ends of the left end of the mounting plate 2. The left side surfaces of the two flexible frames are respectively fixedly connected to the right side surfaces of the upper ends of the two left semi-circular arcs. A left spacing is provided between the lower ends of the two left semi-circular arcs. The right elastic sub-beam 8 is composed of two right semi-circular arcs. The two right semi-circular arcs are distributed front and back at the axial right end in the annular groove 3. Right strain gauges are provided on both of the two right semi-circular arcs. The upper ends of the two right semi-circular arcs are respectively fixed to the front and rear ends of the right end of the mounting plate 2. The right side surfaces of the two flexible frames are respectively fixedly connected to the left side surfaces of the upper ends of the two right semi-circular arcs. A right spacing is provided between the lower ends of the two right semi-circular arcs. The elastic main beam 9 is composed of two main semi-circular arcs. The two main semi-circular arcs are distributed front and back in the axial middle of the annular groove 3. Main strain gauges are provided on both of the two main semi-circular arcs. The upper ends of the two main semi-circular arcs are respectively fixedly connected to the front and rear side surfaces of the flexible frame. An axial spacing is provided between the left elastic sub-beam 7, the elastic main beam 9, and the right elastic sub-beam 8. A radial spacing is provided between the left elastic sub-beam 7, the elastic main beam 9, the right elastic sub-beam 8 and the bottom of the annular groove of the connection base. The two mass blocks 6 are respectively arranged between the lower end of the left elastic sub-beam 7 and the lower end of the elastic main beam 9, and between the lower end of the elastic main beam 9 and the lower end of the right elastic sub-beam 8. The input end of the PID controller receives the signals of the left strain gauge, the right strain gauge, and the main strain gauge. The output end of the PID controller controls the piezoelectric ceramic stack to drive the flexible frame to expand and contract and deform.

[0022] Working principle: In the NES mechanism described in the present invention, the elastic main beam 9 acts as a non-linear spring, and the damping elements are the left elastic auxiliary beam 7 and the right elastic auxiliary beam 8. During use, one end of the columnar connection base is connected to the drill pipe, and the other end is connected to the drill bit. When the drill pipe vibrates within a certain frequency band, the left strain gauge and the right strain gauge detect the existing vibration signal and transmit the vibration signal to the PID controller. The PID controller outputs a certain voltage to the piezoelectric ceramic stack according to the vibration magnitude, and then drives the flexible frame to push the elastic main beam to generate a bending deflection, adjusting the elastic main beam to the non-linear stiffness suitable for vibration suppression at this moment. The main strain gauge feeds back the stiffness value of the elastic main beam detected to the PID controller. When the bending deflection of the elastic main beam reaches the requirement, driving the flexible frame through the piezoelectric ceramic stack is stopped. When the bending deflection of the elastic main beam does not reach the requirement, due to the reduction of the vibration energy at this time, the non-linear vibration will escape from the vibration suppression range of the existing non-linear stiffness. The left strain gauge and the right strain gauge will detect the vibration situation again and repeat the above process until the bending deflection of the elastic main beam reaches the requirement, and then driving the flexible frame through the piezoelectric ceramic stack is stopped.

[0023] During specific implementation, the front and rear sides of the two flexible frames are both V-shaped, which is convenient for telescopic deformation.

[0024] During specific implementation, a vertical partition 10 is provided in the middle of the mounting plate 2 in the front-rear direction. The left end and the right end of the mounting plate 2 are respectively fixed with a left limit plate 11 and a right limit plate 12. The left and right ends of the vertical partition 10 are respectively fixed with the middle parts in the front-rear direction of the left limit plate 11 and the middle parts in the front-rear direction of the right limit plate 12. The two flexible hinges 5 are respectively located on the front and rear sides of the vertical partition 10. The upper ends of the two left semi-circular arcs are both fixed with left connecting plates 13. The left side surfaces of the two left connecting plates 13 are respectively in close contact with the front and rear ends of the right side surface of the left limit plate 11. The front / rear side surfaces of the two left connecting plates 13 are respectively in close contact with the front and rear side surfaces of the left end of the vertical partition 10. The upper ends of the two right semi-circular arcs are both fixed with right connecting plates 14. The right side surfaces of the two right connecting plates 14 are respectively in close contact with the front and rear ends of the left side surface of the right limit plate 12. The front / rear side surfaces of the two right connecting plates 14 are respectively in close contact with the front and rear side surfaces of the right end of the vertical partition 10. The structure is more stable, specific and standardized.

[0025] During specific implementation, left semi-circular grooves are provided on the outer sides of the lower ends of the two left semi-circular arcs, right semi-circular grooves are provided on the outer sides of the lower ends of the two right semi-circular arcs, middle semi-circular grooves are provided on the inner sides of the lower ends of the two main semi-circular arcs, connecting round holes are provided at the front and rear ends of the two mass blocks 6, and the left semi-circular grooves, connecting round holes 16, middle semi-circular grooves, and right semi-circular grooves are arranged in a matching manner. The two connecting rods 15 respectively pass through the corresponding left semi-circular grooves, connecting round holes, middle semi-circular grooves, and right semi-circular grooves to realize the connection of the two mass blocks 6 with the elastic main beam 9, the corresponding left elastic auxiliary beam 7, and the corresponding right elastic auxiliary beam 8. The structure is specific, standardized, and convenient for installation and disassembly.

[0026] During specific implementation, the entire NES mechanism is located within the annular groove 3, occupying a small space, adapting to the deep-hole environment, and avoiding the overall structure being complex and huge and not suitable for the deep-hole machining environment.

[0027] During specific implementation, an external thread for connecting with a drill pipe is provided at the left end of the connecting base 1, and an internal thread for connecting with a drill bit is provided at the right end of the connecting base 1, which is convenient for installation and disassembly during use.

[0028] To verify the vibration suppression situation of the device, a free vibration decay simulation of the drill pipe is now carried out. As Figure 7 shown, it can be seen that the amplitude of the NES fluctuates, and target energy transfer occurs when the first high amplitude of the NES appears, consuming the vibration energy of the drill pipe, and the amplitude of the drill pipe with the NES decreases; then the amplitude of the NES decreases, and at this time the amplitude of the drill pipe with the NES will increase. This is because after the previous target energy transfer, due to the energy of the drill pipe system escaping from the vibration damping frequency band of the NES, the NES cannot capture the existing vibration form for vibration damping. At this time, after controlling the driving piezoelectric ceramic stack through the PID controller to control the stiffness of the elastic main beam 9, a high amplitude of the NES appears again, and target energy transfer occurs again, and so on until it exceeds the variable stiffness ability range.

[0029] In addition, from Figure 8 it can be seen that the amplitude of the drill pipe with the NES is significantly lower than that of the drill pipe without the NES, and the vibration suppression effect is obvious. Thus, it can be proved that the device described in the present invention has a good vibration damping effect, and its structure is simple, occupies a small space, and is suitable for deep-hole machining.

[0030] The above are only specific implementation manners of the present invention, enabling those skilled in the art to understand or implement the present invention. Although the foregoing embodiments have been described in detail, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the foregoing embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A drill pipe vibration reduction device based on a semi-active nonlinear energy sink, characterized in that: The invention comprises a columnar connection base (1), a strip-shaped mounting plate (2), an NES mechanism, and a PID controller. The connection base (1) is provided with an annular groove (3) in the middle of the axial direction, and mounting grooves (4) are respectively provided at the tops of the two side walls of the annular groove (3). The mounting plate (2) is placed in the annular groove (3) and its two ends are respectively fixed in the two mounting grooves (4). The NES mechanism comprises two square flexible frames, two piezoelectric ceramic stacks, two mass blocks (6), a left elastic sub-beam (7), an elastic main beam (9), and a right elastic sub-beam (8). The two piezoelectric ceramic stacks are respectively placed in the two flexible frames to form two flexible hinges. (5), the two flexible hinges (5) are distributed front and rear at the axial middle part of the mounting plate (2) and their telescopic deformation direction is arranged along the circumferential direction, the left elastic subbeam (7) is composed of two left semicircular arcs, the two left semicircular arcs are distributed front and rear at the axial left end part of the annular groove (3), the two left semicircular arcs are provided with left strain gauges, the upper ends of the two left semicircular arcs are respectively fixed to the front and rear ends of the left end part of the mounting plate (2), the left sides of the two flexible frames are respectively fixedly connected to the right sides of the upper ends of the two left semicircular arcs, and a left spacing is provided between the lower ends of the two left semicircular arcs, and the right elastic subbeam (8) is composed of two right semicircular arcs, the two The right semicircular arcs are distributed front and back at the axial right end portion in the annular groove (3), and right strain gauges are provided on the two right semicircular arcs. The upper ends of the two right semicircular arcs are respectively fixed to the front and rear ends of the right end portion of the mounting plate (2), and the right sides of the two flexible frames are respectively fixedly connected to the left sides of the upper ends of the two right semicircular arcs. A right spacing is provided between the lower ends of the two right semicircular arcs. The elastic main beam (9) is composed of two main semicircular arcs. The two main semicircular arcs are distributed front and back at the axial middle portion in the annular groove (3), and main strain gauges are provided on the two main semicircular arcs. The upper ends of the two main semicircular arcs are respectively fixedly connected to the front and rear side surfaces of the flexible frame. An axial spacing is provided between the left elastic sub-beam (7), the elastic main beam (9), and the right elastic sub-beam (8); a radial spacing is provided between the left elastic sub-beam (7), the elastic main beam (9), the right elastic sub-beam (8) and the bottom of the annular groove connected to the base; two mass blocks (6) are respectively provided between the lower end of the left elastic sub-beam (7) and the lower end of the elastic main beam (9), and between the elastic main beam (9) and the lower end of the right elastic sub-beam (8); an input end of a PID controller receives signals of a left strain gauge, a right strain gauge, and a main strain gauge; an output end of the PID controller controls a piezoelectric ceramic stack to drive the flexible frame to telescopically deform.

2. A drill pipe vibration reduction device based on a semi-active nonlinear energy sink according to claim 1, characterized in that: The front and rear sides of the two flexible frames are both V-shaped.

3. A drill pipe vibration reduction device based on a semi-active nonlinear energy sink according to claim 2, characterized in that: A vertical partition (10) is provided in the middle of the mounting plate (2) in the front-to-back direction. A left limit plate (11) and a right limit plate (12) are fixed to the left and right ends of the mounting plate (2) respectively. The left and right ends of the vertical partition (10) are respectively fixed to the middle of the left limit plate (11) in the front-to-back direction and the middle of the right limit plate (12) in the front-to-back direction. Two flexible hinges (5) are respectively located on the front and back sides of the vertical partition (10). The upper ends of the two left semicircular arcs are both fixed with left connecting plates (13). The two left connecting plates (13) are fixed to the left and right ends of the mounting plate (2). The left side surfaces of the two left connecting plates (13) are respectively in close contact with the front and rear ends of the right side surface of the left limiting plate (11), the front / rear side surfaces of the two left connecting plates (13) are respectively in close contact with the front and rear side surfaces of the left end of the vertical partition (10), the upper ends of the two right semicircular arcs are both fixed with right connecting plates (14), the right side surfaces of the two right connecting plates (14) are respectively in close contact with the front and rear ends of the left side surface of the right limiting plate (12), and the front / rear side surfaces of the two right connecting plates (14) are respectively in close contact with the front and rear side surfaces of the right end of the vertical partition (10).

4. The drill pipe vibration reduction device based on a semi-active nonlinear energy sink according to claim 3 is characterized in that: The outer side surfaces of the lower ends of the two left semicircular arcs are each provided with a left semicircular arc groove, the outer side surfaces of the lower ends of the two right semicircular arcs are each provided with a right semicircular arc groove, the inner side surfaces of the lower ends of the two main semicircular arcs are each provided with a middle semicircular arc groove, the front and rear ends of the two mass blocks (6) are each provided with a connecting circular hole (16), the left semicircular arc groove, the connecting circular hole, the middle semicircular arc groove, and the right semicircular arc groove are adaptively arranged, and the two connecting rods (15) respectively pass through the corresponding left semicircular arc groove, the connecting circular hole, the middle semicircular arc groove, and the right semicircular arc groove to realize the connection between the two mass blocks (6) and the elastic main beam (9), the corresponding left elastic auxiliary beam (7), and the corresponding right elastic auxiliary beam (8).

5. A drill pipe vibration reduction device based on a semi-active nonlinear energy sink according to claim 4, characterized in that: The NES mechanism is entirely located in the annular groove (3).

6. A drill pipe vibration reduction device based on a semi-active nonlinear energy sink according to claim 5, characterized in that: The left end of the connection base (1) is provided with an external thread for connecting to a drill rod, and the right end of the connection base (1) is provided with an internal thread for connecting to a drill bit.

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