Semi-active nonlinear energy trap device

Abstract

The invention relates to a semi-active nonlinear energy trap device which comprises a base and a sliding rail arranged on the base. The mass block is arranged on the sliding rail in a sliding manner; the lead screw sliding block mechanism is arranged on the base; the lead screw sliding block mechanism comprises a guide rail, baffles, a lead screw rotationally arranged between the baffles and a sliding block which is arranged on the lead screw and can slide on the guide rail, and the sliding block is connected with the mass block through a spring. The first driving mechanism is arranged on the base; and the second driving mechanism is arranged on the base and connected with the first driving mechanism, and the second driving mechanism is connected with a lead screw of the lead screw sliding block mechanism. Compared with the prior art, the semi-active non-linear energy sink device can adjust the non-linear stiffness characteristic of the semi-active non-linear energy sink device in real time under the action of wind or / and earthquakes and other dynamic loads, can effectively cope with structural vibration of different strengths, and is high in energy robustness.

Description

Technical Field

[0001] The 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 in various engineering fields, such as civil engineering, marine engineering, mechanical processing and precision instruments. Vibration not only reduces the working efficiency of the system, but also may cause fatigue damage, component failure and even structural failure. Therefore, effectively suppressing structural vibration is crucial to improving building safety and comfort, as well as the processing quality of parts and extending the service life of machinery.

[0003] According to the characteristics of the stiffness unit or damping unit, the energy dissipation and vibration reduction device can be divided into two forms: linear and nonlinear. Common linear dampers, such as tuned mass dampers and tuned liquid dampers, are simple in principle and widely used, but they are sensitive to changes in the characteristics of the main structure and are prone to misalignment, resulting in a decrease in the vibration reduction effect. In severe cases, it will 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 current research has made great progress in the vibration reduction performance of NES, there are still some problems. The vibration frequency of traditional passive NES is very sensitive to the vibration amplitude of the controlled structure, that is, the energy robustness is poor. Therefore, it is of great significance to develop semi-active, strong robustness, and high vibration reduction rate additional substructure vibration control technology. 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 disposed on the base;

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

[0010] A screw slider mechanism is arranged on the base; the screw slider mechanism comprises a guide rail, a baffle, a screw rotatably arranged between the baffles, and a slider arranged 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 arranged 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 arranged 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 bottom plate, and the guide rail and the baffle are both installed on the bottom 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 a collection system, and the collection system is used to collect dynamic response and external excitation information of the controlled structure and transmit the collected 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 detuning 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 cope with structural vibrations of different intensities, and has 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 It is a schematic diagram of the overall structure of the semi-active nonlinear energy sink device of the present invention.

[0030] Figure 2 It is a top view of the semi-active nonlinear energy well 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 It is a schematic diagram of the connection relationship between the first driving mechanism and the second driving mechanism of the present invention.

[0034] Figure 6 It is a structural schematic diagram of the first driving mechanism of the present invention.

[0035] Figure 7It is a schematic structural diagram of the second driving mechanism of the present invention.

[0036] Figure 8 It is an equivalent schematic diagram of the semi-active nonlinear energy sink device of the present invention.

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

[0038] Fig.10 It is a schematic diagram of the nonlinear stiffness of the semi-active nonlinear energy sink device of the present invention.

[0039] Description of the markings 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 driving mechanism, 61-first driving wheel, 62-first driven wheel, 63-electric driving part; 7-second driving mechanism, 71-second driving wheel, 72-second driven wheel, 73-transmission shaft; 8-control system; 9-acquisition system. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with 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", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly 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, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill 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, further definition and explanation thereof is not required in subsequent drawings.

[0044] Embodiment 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, the screw slider mechanism 4 is arranged on the base 1, and the screw slider mechanism 4 includes a guide rail 41, a baffle 42, a screw 43 rotatably arranged between the baffles 41, and a slider 44 arranged on the screw 43 and capable of sliding on the guide rail 41, and the slider 44 is connected to the mass block 3 through a spring 5. The first drive mechanism 6 and the second drive mechanism 7 are both arranged on the base 1, and 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, in this embodiment, the first driving mechanism 6 drives the second driving mechanism 7 to rotate, 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 motion trajectory of the mass block 3 on the slide rail 2, thereby changing the nonlinear stiffness characteristics of the semi-active nonlinear energy sink device of this embodiment, so as to achieve the vibration reduction target under different external excitations and vibration intensities of the controlled structure.

[0048] Embodiment 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 the embodiment 1 is that two slide rails 2 are arranged in parallel on the base 1 of the 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 arranged on the base 1, and the screw slider mechanisms 4 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.

[0051] The screw slider mechanism 4 of this embodiment 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 plates 45 of the screw slider mechanism 4 are both mounted on the side plates 11. The screw 43 of the screw slider mechanism 4 passes through the slider 44 and is connected to the slider 44 through 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 through 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 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] Embodiment 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, which is connected to the electric drive 63 through an electric wire and can output current to drive the rotation of the electric drive 63. The control system 8 is also connected to a collection system 9, which is used to collect the dynamic response and external excitation information of the controlled structure and transmit the collected information to the control system 8. Under the action of wind and / or earthquake and other dynamic loads, the collection system 9 records the vibration of the controlled structure and the external excitation information in real time, and transmits it to the control system 8 as an input signal. The control system 8 outputs the feedback as current through calculation, thereby controlling the rotation of the electric drive 63.

[0056] Embodiment 4:

[0057] The present embodiment provides a semi-active nonlinear energy well device, which is integrally installed on a main structure, and includes a base 1, a side panel 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 a collection system 9.

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

[0059] The driving system of this embodiment includes an electric drive member 63, a first driving mechanism 6, a second driving mechanism 7, a transmission shaft 73 and a screw slider mechanism 4. The first driving mechanism 6 and the second driving mechanism 7 are both double driven bevel gear systems, wherein the first driving mechanism 6 includes a first driving wheel 61 and two first driven wheels 62, and the second driving mechanism 7 includes a second driving wheel 71 and two second driven wheels 72. The driving wheels of the first driving mechanism 6 and the second driving mechanism 7 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 perpendicular to the plane where the driving wheel is located. The first driving wheel 61 of the first driving mechanism 6 is fixedly connected to the output shaft of the electric drive member 63 (servo motor), and the first driving wheel 61 is driven to rotate by the servo motor. The number of the second driving mechanism 7 is two, and the two second driving wheels 71 are respectively connected to the two first driven wheels 62 of the first driving mechanism 6 through the transmission shaft 73, ensuring that the first driven wheel 62 can drive the rotation of the second driving wheel 71.

[0060] The screw slider mechanisms 4 of this embodiment are symmetrically arranged on both sides, and there are four of them. The bottom plate 45 of the screw slider mechanism 4 is fixedly connected to the side plate 11 of the base 1. The four screw rods 43 are respectively fixedly connected to the second driven wheel 72 of the second driving mechanism 7. The screw rods 43 pass through the slider 44 and are connected to the slider 44 through nuts, ensuring that the slider 44 moves in a translational manner along the axis of the screw rod 43 while the second driven wheel 72 drives the screw rod 43 to rotate.

[0061] The number of springs 5 ​​in this embodiment is four. One end of the spring 5 is fixedly connected to the slider 44, and the other end is fixedly connected to the mass block 3. Initially, the four springs 5 ​​are symmetrically arranged to provide nonlinear elastic restoring force when the mass block 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 trap device of this embodiment is as follows:

[0064] The semi-active nonlinear energy trap 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, and when mass block 3 moves a distance x along the slide rail, the nonlinear restoring force provided by four springs 5 ​​along the moving direction of mass block 3 can be expressed as:

[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 results and nonlinear stiffness results are shown in Figure 9-10 As shown in the figure. It can be seen that when the position of the slider changes, that is, when l3 changes, the nonlinear stiffness characteristics of the semi-active nonlinear energy sink system change accordingly. When the energy of the seismic input to the controlled structure is different, the corresponding optimal nonlinear stiffness curve is also different. 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 the semi-active nonlinear energy sink device of this embodiment, under the action of wind or / and earthquake and other dynamic loads, the acquisition system 9 records the information of the controlled structure vibration and external excitation in real time, and transmits it as an input signal to the control system 8. The control system 8 calculates and outputs the feedback as current, thereby controlling the rotation of the electric drive member 63, and driving the translation of the slider 44 through the transmission shaft 73 and the second drive mechanism 7, thereby changing the nonlinear stiffness characteristics of the semi-active nonlinear energy sink device, and achieving the optimal vibration reduction target under different external excitations and vibration intensities of the controlled structure.

[0068] In summary, the present invention provides a semi-active nonlinear energy sink device with adjustable nonlinear stiffness characteristics, strong energy robustness and 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 to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and 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) disposed on the base (1); A mass block (3) slidably disposed on the slide rail (2); A screw-slider mechanism (4) is arranged on a base (1); the screw-slider mechanism (4) comprises a guide rail (41), a baffle (42), a screw rod (43) rotatably arranged between the baffles (41), and a slider (44) arranged 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) disposed on the base (1); A second drive mechanism (7) is arranged on the base (1) and connected to the first drive mechanism (6); the second drive mechanism (7) is connected to a screw (43) of a screw slider mechanism (4).

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. A semi-active nonlinear energy sink device according to claim 1, characterized in that: A total of four groups of screw slider mechanisms (4) are arranged on the base (1), the screw slider mechanisms (4) are symmetrically arranged on both sides of the mass block (3), and the sliders (44) of each group of screw slider mechanisms (4) are connected to the mass block (3).

4. A semi-active nonlinear energy sink device according to claim 1, characterized in that: The screw slider mechanism (4) further comprises a bottom plate (45), and the guide rail (41) and the baffle (42) are both mounted on the bottom plate (45).

5. A semi-active nonlinear energy sink device according to claim 4, characterized in that: The base (1) is provided with side plates (11) on both sides along the length direction of the slide rail (2), and the bottom plates (45) of the screw slider mechanism (4) are both installed on the side plates (11).

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

7. A semi-active nonlinear energy sink device according to claim 1, characterized in that: The first driving mechanism (6) comprises 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) comprises 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).

8. A semi-active nonlinear energy sink device according to claim 7, characterized in that: 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).

9. A semi-active nonlinear energy sink device according to claim 7, characterized in that: The electric drive component (63) is connected to a control system (8).

10. A semi-active nonlinear energy sink device according to claim 9, characterized in that: The control system (8) is connected to a collection system (9), and the collection system (9) is used to collect dynamic response and external excitation information of the controlled structure and transmit the collected information to the control system (8).

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