A semi-active nonlinear energy sink device

Abstract

The present invention relates to a semi-active nonlinear energy sink device, comprising a base, a slide rail provided on the base, a mass block slidably provided on the slide rail, a screw slider mechanism provided on the base, the screw slider mechanism comprising a guide rail, a baffle, a screw rod rotatably provided between the baffles, and a slider provided on the screw rod and capable of sliding on the guide rail, wherein the slider and the mass block are connected via a spring, a first driving mechanism provided on the base, a second driving mechanism provided on the base and connected to the first driving mechanism, wherein the second driving mechanism is connected to the screw rod of the screw slider mechanism. Compared with the prior art, the semi-active nonlinear energy sink device of the present invention can adjust the nonlinear stiffness characteristics of the semi-active nonlinear energy sink device in real time under the action of wind and / or earthquake and other dynamic loads, effectively cope with structural vibrations of different intensities, and has strong energy robustness.

Description

Technical Field

[0001] The present invention relates to the technical field of structural vibration control, in particular to a semi-active nonlinear energy sink device. Background Art

[0002] Structural vibration is a common problem across various engineering fields, including civil engineering, marine engineering, machining, and precision instrumentation. Vibration not only reduces system efficiency but can also lead to fatigue damage, component failure, and even structural failure. Therefore, effectively suppressing structural vibration is crucial to improving building safety and comfort, ensuring component quality, and extending the service life of machinery.

[0003] Energy dissipation and vibration reduction devices can be divided into two types: linear and nonlinear, depending on the characteristics of the stiffness unit or damping unit. Common linear dampers, such as tuned mass dampers and tuned liquid dampers, although simple in principle and widely used, are sensitive to changes in the main structural characteristics and are prone to imbalance effects, resulting in a decrease in the vibration reduction effect. In severe cases, it can even aggravate the vibration response of the main structure. Nonlinear Energy Sink (NES) is a typical energy dissipation and vibration reduction device with stiffness nonlinearity. With its advantages of light weight, simple structure, strong robustness, and wide vibration reduction bandwidth, it has shown good application prospects in nonlinear energy dissipation and vibration reduction.

[0004] Although significant progress has been made in the vibration reduction performance of NES, several challenges remain. The vibration frequency of traditional passive NES is highly sensitive to the vibration amplitude of the controlled structure, resulting in poor energy robustness. Therefore, developing semi-active, robust, and high-damping additional substructure vibration control technology is of great significance. Summary of the Invention

[0005] The purpose of the present invention is to provide a semi-active nonlinear energy sink device in order to overcome the defect of poor robustness of the existing passive nonlinear energy sink.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A semi-active nonlinear energy sink device comprises a base and further comprises:

[0008] a slide rail provided on the base;

[0009] A mass block slidingly arranged on the slide rail;

[0010] A screw-slider mechanism is provided on the base; the screw-slider mechanism includes a guide rail, a baffle, a screw that is rotatably provided between the baffles, and a slider provided on the screw and capable of sliding on the guide rail, wherein the slider is connected to the mass block via a spring;

[0011] a first driving mechanism disposed on the base;

[0012] A second driving mechanism is provided on the base and connected to the first driving mechanism, wherein the second driving mechanism is connected to the screw of the screw slider mechanism.

[0013] Furthermore, two slide rails are provided in parallel on the base, and rollers capable of sliding on the slide rails are installed at the four corners of the bottom of the mass block.

[0014] Furthermore, a total of four sets of screw slider mechanisms are provided on the base, and the screw slider mechanisms are symmetrically arranged on both sides of the mass block, and the sliders of each set of screw slider mechanisms are connected to the mass block.

[0015] Furthermore, the screw slider mechanism also includes a base plate, and the guide rail and the baffle are both installed on the base plate.

[0016] Furthermore, side panels are installed on both sides of the base along the length direction of the slide rail, and the bottom plates of the screw slider mechanism are installed on the side panels.

[0017] Furthermore, the screw of the screw slider mechanism passes through the slider and is connected to the slider via a nut.

[0018] Furthermore, the first driving mechanism includes a first driving wheel, a first driven wheel meshingly connected to the first driving wheel, and an electric driving member for driving the first driving wheel to rotate.

[0019] Furthermore, the second driving mechanism includes a second driving wheel and a second driven wheel meshingly connected to the second driving wheel.

[0020] Furthermore, the first driven wheel and the second driving wheel are connected via a transmission shaft.

[0021] Furthermore, one end of the screw rod is connected to one of the baffles via a bearing, and the other end of the screw rod passes through a reserved hole of the other baffle and is connected to the second driven wheel.

[0022] Furthermore, the electric drive component is connected to a control system.

[0023] Furthermore, the control system is connected to an acquisition system, which is used to acquire dynamic response and external excitation information of the controlled structure and transmit the acquired information to the control system.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The semi-active nonlinear energy sink device of the present invention has strong stiffness nonlinearity, which effectively overcomes the problem that traditional linear dampers are prone to imbalance effects when responding to changes in the main structural characteristics, broadens the damping frequency band of the damper, and has the advantages of instantaneous resonance capture and targeted energy transfer, can achieve rapid energy transfer, and has the characteristics of unidirectional irreversibility, which significantly improves the vibration reduction effect and system stability.

[0026] (2) The semi-active nonlinear energy sink device of the present invention can adjust the nonlinear stiffness characteristics of the semi-active nonlinear energy sink device in real time according to the structural vibration and external excitation information under the action of wind and / or earthquake and other dynamic loads, effectively responding to structural vibrations of different intensities, with strong energy robustness, which makes up for the shortcomings of traditional passive nonlinear energy sinks in this regard.

[0027] (3) The semi-active nonlinear energy sink device of the present invention records the dynamic response of the controlled structure and external excitation information in real time through the acquisition system, and inputs it into the control system in real time. The control system outputs feedback current in real time, controls the rotation of the servo motor, drives the slider of the screw slider mechanism to move, and changes the geometric arrangement of the spring, so as to achieve the effect of changing the nonlinear stiffness characteristics of the system and real-time control, improve the energy robustness of the nonlinear energy sink system, and achieve the vibration reduction target under different external excitations and vibration intensities of the controlled structure.

[0028] (4) The driving mechanism used in the semi-active nonlinear energy trap device of the present invention is a common mechanical device, such as a servo motor, gears, a screw-slider mechanism, etc., which has a simple structure, high reliability and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the overall structure of the semi-active nonlinear energy sink device of the present invention.

[0030] Figure 2 This is a top view of the semi-active nonlinear energy sink device of the present invention.

[0031] Figure 3 It is a front view of the semi-active nonlinear energy sink device of the present invention.

[0032] Figure 4 It is a structural schematic diagram of the screw slider mechanism of the present invention.

[0033] Figure 5 Schematic diagram of the connection relationship between the first drive mechanism and the second drive mechanism of the present invention.

[0034] Figure 6 Schematic diagram of the structure of the first driving mechanism of the present invention.

[0035] Figure 7Schematic diagram of the structure of the second driving mechanism of the present invention.

[0036] Figure 8 Schematic diagram of the equivalent semi-active nonlinear energy sink device of the present invention.

[0037] Figure 9 Schematic diagram of the nonlinear restoring force of the semi-active nonlinear energy sink device of the present invention.

[0038] Figure 10 Schematic diagram of the nonlinear stiffness of the semi-active nonlinear energy sink device of the present invention.

[0039] Description of the marks in the figure:

[0040] 1-base, 11-side panel; 2-slide rail; 3-mass block, 31-roller; 4-screw slider mechanism, 41-guide rail, 42-baffle, 43-screw, 44-slider, 45-bottom plate; 5-spring; 6-first drive mechanism, 61-first driving wheel, 62-first driven wheel, 63-electric drive component; 7-second drive mechanism, 71-second driving wheel, 72-second driven wheel, 73-drive shaft; 8-control system; 9-acquisition system. DETAILED DESCRIPTION

[0041] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0042] In the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance; in addition, unless otherwise expressly specified and limited, the terms "installed", "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 a direct connection, an indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0044] Example 1:

[0045] A semi-active nonlinear energy sink device, such as Figure 1-3 As shown, it includes a base 1, a slide rail 2, a mass block 3, a screw slider mechanism 4, a first drive mechanism 6 and a second drive mechanism 7.

[0046] The slide rail 2 of this embodiment is arranged on the base 1, and the mass block 3 is slidably arranged on the slide rail 2. Figure 4 As shown, a screw-slider mechanism 4 is provided on the base 1. The screw-slider mechanism 4 includes a guide rail 41, a baffle 42, a screw 43 rotatably disposed between the baffles 41, and a slider 44 disposed on the screw 43 and capable of sliding on the guide rail 41. The slider 44 is connected to the mass 3 via a spring 5. A first drive mechanism 6 and a second drive mechanism 7 are both provided on the base 1. The second drive mechanism 7 is connected to the first drive mechanism 6, and the second drive mechanism 7 is also connected to the screw 43 of the screw-slider mechanism 4.

[0047] Under the action of wind and / or earthquake and other dynamic loads, this embodiment drives the second driving mechanism 7 to rotate through the first driving mechanism 6, thereby driving the screw 43 of the screw slider mechanism 4 to rotate, and then driving the slider 44 of the screw slider mechanism 4 to move on the guide rail 41, thereby changing the geometric arrangement of the spring 5 and the movement trajectory of the mass block 3 on the slide rail 2, thereby changing the nonlinear stiffness characteristics of the semi-active nonlinear energy well device of this embodiment, so as to achieve the vibration reduction target under different external excitations and vibration intensities of the controlled structure.

[0048] Example 2:

[0049] A semi-active nonlinear energy sink device comprises a base 1, a slide rail 2, a mass block 3, a screw slider mechanism 4, a first drive mechanism 6 and a second drive mechanism 7.

[0050] The difference from Example 1 is that two parallel slide rails 2 are provided on the base 1 of this embodiment, and rollers 31 that can slide on the slide rails 2 are installed at the four corners of the bottom of the mass block 3. A total of four sets of screw slider mechanisms 4 are provided on the base 1, and the screw slider mechanisms 4 are symmetrically arranged on both sides of the mass block 3. The sliders 44 of each set of screw slider mechanisms 4 are connected to the mass block 3.

[0051] The screw-slider mechanism 4 of this embodiment also includes a base plate 45, on which the guide rail 41 and baffle 42 are mounted. The base 1 is provided with side plates 11 on both sides of the length of the guide rail 2, and the base plates 45 of the screw-slider mechanism 4 are mounted on these side plates 11. The screw 43 of the screw-slider mechanism 4 passes through the slider 44 and is connected to the slider 44 via a nut.

[0052] like Figure 5-7 As shown, the first driving mechanism 6 of this embodiment includes a first driving wheel 61, a first driven wheel 62 meshingly connected to the first driving wheel 61, and an electric driving member 63 for driving the first driving wheel 61 to rotate. The electric driving member 63 can be a conventional servo motor. The second driving mechanism 7 includes a second driving wheel 71 and a second driven wheel 72 meshingly connected to the second driving wheel 71. The first driven wheel 62 and the second driving wheel 71 are connected by a transmission shaft 73. One end of the screw rod 43 is connected to one of the baffles 41 through a bearing, and the other end of the screw rod 43 passes through the reserved hole of the other baffle 41 and is connected to the second driven wheel 72. The driving wheels of the first driving mechanism 6 and the second driving mechanism 7 of this embodiment can both drive the rotation of the corresponding driven wheels, thereby realizing the transmission of the rotation of the plane where the driving wheel is located to the rotation of the plane where the two driven wheels are located that are perpendicular to the plane where the driving wheel is located. In this embodiment, two first driven wheels 62 and two second driven wheels 72 are provided, and finally four second driven wheels 72 are provided in total, and each second driven wheel 72 is connected to the screw 43 of the corresponding screw slider mechanism 4.

[0053] Example 3:

[0054] A semi-active nonlinear energy sink device comprises a base 1, a slide rail 2, a mass block 3, a screw slider mechanism 4, a first drive mechanism 6 and a second drive mechanism 7.

[0055] The difference from Example 2 is that the electric drive 63 of this embodiment is connected to a control system 8. This control system 8 is connected to the electric drive 63 via electrical wiring and can output current to drive the rotation of the electric drive 63. The control system 8 is also connected to a data acquisition system 9, which is used to collect dynamic response information and external excitation information of the controlled structure and transmit this collected information to the control system 8. Under the influence of wind and / or earthquakes and other dynamic loads, the data acquisition system 9 records the vibration of the controlled structure and external excitation information in real time and transmits it as input signals to the control system 8. The control system 8 calculates and outputs the feedback as current, thereby controlling the rotation of the electric drive 63.

[0056] Example 4:

[0057] This embodiment provides a semi-active nonlinear energy well device, which is installed as a whole on the main structure, including a base 1, a side plate 11, a slide rail 2, a mass block 3, a roller 31, a first drive mechanism 6, a second drive mechanism 7, an electric drive component 63, a transmission shaft 73, a screw slider mechanism 4, a spring 5, a control system 8 and an acquisition system 9.

[0058] The mass block 3 of this embodiment is hollowed out in the middle, and four rollers 31 are installed at the bottom. The mass block 3 is placed above the slide rail 2 and can reciprocate along the axis of the slide rail 2. Initially, the mass block 3 is located in the middle of the slide rail 2.

[0059] The drive system of this embodiment includes an electric drive component 63, a first drive mechanism 6, a second drive mechanism 7, a transmission shaft 73, and a screw slider mechanism 4. The first drive mechanism 6 and the second drive mechanism 7 are both dual-driven bevel gear systems, wherein the first drive mechanism 6 includes a first driving wheel 61 and two first driven wheels 62, and the second drive mechanism 7 includes a second driving wheel 71 and two second driven wheels 72. The driving wheels of the first drive mechanism 6 and the second drive mechanism 7 can both drive the rotation of the corresponding driven wheels, thereby transmitting the rotation of the plane in which the driving wheel is located to the rotation of the plane in which the two driven wheels are located perpendicular to the plane in which the driving wheel is located. The first driving wheel 61 of the first drive mechanism 6 is fixedly connected to the output shaft of the electric drive component 63 (servo motor), and the servo motor drives the first driving wheel 61 to rotate. There are two second drive mechanisms 7, and the two second driving wheels 71 are respectively connected to the two first driven wheels 62 of the first drive mechanism 6 via transmission shafts 73, ensuring that the first driven wheel 62 can drive the rotation of the second driving wheel 71.

[0060] In this embodiment, four screw-slider mechanisms 4 are symmetrically arranged on either side. The base plates 45 of the screw-slider mechanisms 4 are fixedly connected to the side plates 11 of the base 1. Four screws 43 are respectively fixedly connected to the second driven wheels 72 of the second drive mechanism 7. The screws 43 pass through the sliders 44 and are connected to them via nuts, ensuring that when the second driven wheels 72 drive the screws 43 to rotate, the sliders 44 translate along the axis of the screws 43.

[0061] In this embodiment, there are four springs 5. One end of each spring 5 is fixedly connected to the slider 44, and the other end is fixedly connected to the mass 3. Initially, the four springs 5 ​​are symmetrically arranged to provide a nonlinear elastic restoring force when the mass 3 slides back and forth along the slide rail 2.

[0062] The control system 8 of this embodiment is connected to the electric drive component 63 and the acquisition system 9 respectively. The control system 8 receives the signal input by the acquisition system 9, calculates and outputs the corresponding current, and then drives the electric drive component 63 to rotate, realizes the translation of the slider 44, changes the geometric arrangement of the spring 5, and thus changes the nonlinear stiffness characteristics of the semi-active nonlinear energy sink device.

[0063] The specific working mechanism of the semi-active nonlinear energy sink device of this embodiment is as follows:

[0064] The semi-active nonlinear energy sink device of this embodiment can be expressed as: Figure 8 Assume that the original length of spring 5 is l0 and the stiffness is k. When spring 5 is perpendicular to side plate 11, its length is l1 (l1 ≥ l0). The sliding distance of slider 44 is l3. When mass block 3 moves a distance x along the slide rail, the nonlinear restoring force provided by the four springs 5 ​​along the moving direction of mass block 3 can be expressed as follows:

[0065]

[0066] In order to describe the nonlinear stiffness characteristics of the system under different sliding distances l3, the above nonlinear restoring force formula is visualized and the nonlinear stiffness variation curve is obtained by derivation. The parameters take specific values: k = 1, l0 = 200, l1 = 200. The final nonlinear restoring force and nonlinear stiffness results are shown as follows: Figure 9-10 As shown in Figure 1 , it can be seen that when the slider position changes, that is, when l3 changes, the nonlinear stiffness characteristics of the semi-active nonlinear energy sink system also change. When the seismic input energy of the controlled structure varies, the corresponding optimal nonlinear stiffness curve also varies. Therefore, when the current energy state of the controlled structure is monitored, the control system can output current to change the slider position and adjust to the optimal nonlinear stiffness curve, thereby ensuring the optimal vibration reduction effect and improving the energy robustness of the system.

[0067] In this embodiment, the semi-active nonlinear energy sink device, when subjected to wind and / or earthquake and other dynamic loads, uses a data acquisition system 9 to record the vibration of the controlled structure and external excitation information in real time, transmitting this information as input signals to a control system 8. The control system 8 calculates and outputs this feedback as an electric current, which in turn controls the rotation of the electric drive element 63 and drives the translation of the slider 44 via the transmission shaft 73 and the second drive mechanism 7. This modifies the nonlinear stiffness characteristics of the semi-active nonlinear energy sink device, achieving optimal vibration reduction under varying external excitations and controlled structure vibration intensities.

[0068] In summary, the present invention provides a semi-active nonlinear energy sink device with adjustable nonlinear stiffness characteristics, strong energy robustness, and a high vibration reduction rate. Under the action of wind and / or earthquake and other dynamic loads, the nonlinear stiffness characteristics of the semi-active nonlinear energy sink device can be adjusted in real time to effectively cope with structural vibrations of different intensities.

[0069] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A semi-active nonlinear energy sink device, comprising a base (1), characterized in that: Also includes: A slide rail (2) provided on the base (1); A mass block (3) slidably arranged on the slide rail (2); A screw-slider mechanism (4) is provided on the base (1); the screw-slider mechanism (4) comprises a guide rail (41), a baffle (42), a screw rod (43) rotatably provided between the baffles (41), and a slider (44) provided on the screw rod (43) and capable of sliding on the guide rail (41); the slider (44) is connected to the mass block (3) via a spring (5); A first driving mechanism (6) provided on the base (1); a second drive mechanism (7) provided on the base (1) and connected to the first drive mechanism (6), wherein the second drive mechanism (7) is connected to the screw (43) of the screw slider mechanism (4); The base (1) is provided with four sets of screw slider mechanisms (4), which are symmetrically arranged on both sides of the mass block (3), and the sliders (44) of each set of screw slider mechanisms (4) are connected to the mass block (3) via springs (5); The screw slider mechanism (4) further includes a bottom plate (45), and the guide rail (41) and the baffle (42) are both mounted on the bottom plate (45); the base (1) is mounted with side plates (11) on both sides along the length direction of the slide rail (2), and the bottom plate (45) of the screw slider mechanism (4) is mounted on the side plates (11); The first driving mechanism (6) includes a first driving wheel (61), a first driven wheel (62) meshingly connected to the first driving wheel (61), and an electric driving member (63) for driving the first driving wheel (61) to rotate; the second driving mechanism (7) includes a second driving wheel (71) and a second driven wheel (72) meshingly connected to the second driving wheel (71); the first driven wheel (62) and the second driving wheel (71) are connected via a transmission shaft (73); one end of the screw rod (43) is connected to one of the baffles (41) via a bearing, and the other end of the screw rod (43) passes through a reserved hole of the other baffle (41) and is connected to the second driven wheel (72); the electric driving member (63) is connected to a control system (8).

2. A semi-active nonlinear energy sink device according to claim 1, characterized in that: Two slide rails (2) are arranged in parallel on the base (1), and rollers (31) capable of sliding on the slide rails (2) are installed at the four corners of the bottom of the mass block (3).

3. The semi-active nonlinear energy sink device according to claim 1, characterized in that: The screw (43) of the screw slider mechanism (4) passes through the slider (44) and is connected to the slider (44) via a nut.

4. The semi-active nonlinear energy sink device according to claim 1, characterized in that: The control system (8) is connected to an acquisition system (9), and the acquisition system (9) is used to acquire dynamic response and external excitation information of the controlled structure and transmit the acquired information to the control system (8).

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