阅读说明：本技术 一种带有双稳态非线性能量阱的周期结构 (A kind of periodic structure with bistable state nonlinear energy trap ) 是由 万水 周鹏 王国清 李志聪 张钰伯 景茂武 符俊冬 王潇 年玉泽 李夏元 程红光 于 2019-09-03 设计创作，主要内容包括：本发明涉及一种带有双稳态非线性能量阱的周期结构,该周期结构包括板基体,以及按照周期性或者拟周期性排列在所述板基体上凸起设置的m行n列的双稳态NES；其中双稳态NES由两个弹簧、一个阻尼器和一个小质量块组成；每个弹簧通过刚性固定端与板基体固结在一起；刚性固定端的轴线垂直于板基体的表面,弹簧一端与刚性固定端相连,另一端与小质量块相连；阻尼器一端与小质量块相连,另一端与板基体表面相连。与传统的隔振吸振结构相比,这种带有双稳态非线性能量阱的周期结构具有附加质量小、振动抑制频带宽、可完成定向靶能量传递、可靠性高、鲁棒性强、无需外界提供能源等优点,在冲击与冲击波防护领域具有广泛的应用前景。(The present invention relates to a kind of periodic structure with bistable state nonlinear energy trap, which includes plate matrix, and the bistable state NES arranged according to the m row n that periodicity or relaxed periodicity are arranged in protrusion setting on the plate matrix；Wherein bistable state NES is made of two springs, a damper and a small mass block；Each spring is consolidated by rigidly fixing end with plate matrix；The surface of the axis perpendicular to plate matrix at end is rigidly fixed, spring one end is connected with end is rigidly fixed, and the other end is connected with small mass block；Damper one end is connected with small mass block, and the other end is connected with plate matrix surface.Compared with traditional vibration isolation vibration absorbing structure, this periodic structure with bistable state nonlinear energy trap has many advantages, such as small additional mass, vibration suppression bandwidth, achievable orientation target energy transmission, high reliablity, strong robustness, is not necessarily to the extraneous offer energy, is with a wide range of applications in impact with blast protection field.)

1. a kind of periodic structure with bistable state nonlinear energy trap, which is characterized in that the periodic structure includes plate matrix (1), and according to periodicity or relaxed periodicity it is arranged in the bistable state of the m row n column of protrusion setting on the plate matrix (1) NES(2)；Wherein bistable state NES (2) is by two springs (2-1), a damper (2-2) and one small mass block (2-3) group At；Each spring (2-1) is consolidated by rigidly fixing end (3) with plate matrix (1)；The axis for rigidly fixing end (3) hangs down Directly in the surface of plate matrix (1), spring one end (2-1) is connected with end (3) is rigidly fixed, the other end and small mass block (2-3) phase Even；Damper one end (2-2) is connected with small mass block (2-3), and the other end is connected with plate matrix (1) surface.

2. a kind of periodic structure with bistable state nonlinear energy trap according to claim 1, which is characterized in that described Angle of the spring (2-1) between axis and horizontal line is θ, as | θ | for it is a certain be greater than 0 ° of angle when, two springs (2-1) are in Drift l₀, the structure is generally in equilibrium state at this time；When θ=0 °, two springs (2-1) length is l, l < l₀, at this time Two springs (2-1) are in compressive state, and structure is generally in non-equilibrium state.

3. a kind of periodic structure with bistable state nonlinear energy trap according to claim 1, which is characterized in that described The vibration being stacked by one layer of soft material (4) and one layer of hard material (5) that first onboard protrusion setting m row n is arranged on plate matrix (1) Son, then bistable state NES (2) are set on each oscillator, and by rigidly fixing end (3) consolidation.

4. a kind of periodic structure with bistable state nonlinear energy trap according to claim 3, which is characterized in that described Bistable state NES (2) and protrusion setting the scatterer oscillator being stacked by soft material (4) and hard material (5) in parent plate (1) It is upper to be arranged for unilateral or bilateral.

5. a kind of periodic structure with bistable state nonlinear energy trap according to claim 1, which is characterized in that described The small mass block (2-3) of bistable state NES (2) be cylinder, cuboid or spherical shape；The shape for rigidly fixing end (3) is Cylindrical or cuboid.

6. a kind of periodic structure with bistable state nonlinear energy trap according to claim 3, which is characterized in that described Soft material (4) and hard material (5) shape it is identical or different, for cylindrical or cuboid.

7. a kind of periodic structure with bistable state nonlinear energy trap according to claim 1, which is characterized in that described The thickness of parent plate (1), the small mass block (2-3) of bistable state NES (2) and soft material (4), hard material (5) is identical or different.

8. a kind of periodic structure with bistable state nonlinear energy trap according to claim 1, which is characterized in that described M row n column bistable state NES (2) composition periodic structure the smallest repetitive unit be called unit cell, the arrangement shape between each unit cell Shape is square, equilateral triangle or other polygons.

9. a kind of periodic structure with bistable state nonlinear energy trap according to claim 1, which is characterized in that described The material of parent plate (1) is metal, concrete, ceramics, fibre reinforced composites or rubber or polyurethane material.

10. a kind of periodic structure with bistable state nonlinear energy trap according to claim 3, which is characterized in that institute Stating soft material (4) is the high molecular materials such as rubber or polyurethane；The small mass block (2-3) of hard material (5) and bistable state NES (2) Material be metal, concrete, ceramics or fibre reinforced composites.

Technical field

The present invention relates to a kind of periodic structures, tie more particularly to a kind of period with bistable state nonlinear energy trap Structure.Belong to the technical field of vibration, impact and the manufacture of surge guard material.

Background technique

The concept of periodic structure, also known as phonon crystal, phonon crystal is derived by photonic crystal, in phonon crystal, The elastic constant material periodicities different with density arrange, and the material being connected between each other is known as matrix, disconnected material Material is known as scatterer.Vibration is usually to be propagated in periodic structure in the form of elastic wave, and elastic wave band gaps can be described as vibrating again Band gap.The elastic wave band gaps of periodic structure can be used for vibration damping, on the one hand can provide certain frequency model for high-precision system of processing Interior processing environment without friction is enclosed, guarantees higher requirement on machining accuracy；It on the other hand can be special precision instrument or equipment Chatter-free operation environment within the scope of certain frequency is provided, operating accuracy and reliability is improved, prolongs its service life simultaneously.

The concept of nonlinear energy trap (nonlinear energy sink, NES) is set forth in 2000 or so, it be It developed on the basis of dynamic vibration absorber.Linear power bump leveller needs to occur to resonate with main structure to realize vibration damping, this Cause it to can be only applied to vibration frequency and changes lesser equipment.Small nonlinearity dynamic vibration absorber can be widened to a certain extent Vibration damping frequency band, however it still can only absorb vibrational energy from a certain special frequency band.Semi-active type, active and hybrid absorbing Device design, makes dynamic vibration absorber have frequency-tracking or multiband damping capacity, however these schemes need the additional energy to fill It sets and controller, therefore there are significant limitations for its application.Nonlinear energy trap is a kind of absorbing with pure non-linear rigidity Device has attracted the concern of a large number of researchers due to having many advantages, such as wideband absorbing, lightweight.And distinctive stable state in bistable state NES Transition can be improved the sphere of action of efficient target energy transmission.The research of NES structure and its TET mechanism is that design has shock wave The metamaterial structure of modulating properties has established theoretical basis, is expected to prevent for the impact of the important equipments such as naval vessel, plate armour and shock wave Shield provides technical support.

Summary of the invention

Technical problem: the object of the present invention is to provide a kind of periodic structures with bistable state nonlinear energy trap, pass through Bistable state nonlinear energy trap is periodically set on parent plate, to realize the inhibition and absorption to transient impact energy.

Technical solution: the present invention is a kind of periodic structure with bistable state nonlinear energy trap, which includes Plate matrix, and the bistable state arranged according to the m row n that periodicity or relaxed periodicity are arranged in protrusion setting on the plate matrix NES；Wherein bistable state NES is made of two springs, a damper and a small mass block；Each spring is by rigidly fixing End is consolidated with plate matrix；It rigidly fixes the surface of the axis perpendicular to plate matrix at end, spring one end and rigidly fixes end It is connected, the other end is connected with small mass block；Damper one end is connected with small mass block, and the other end is connected with plate matrix surface.

Angle between the axle of spring and horizontal line is θ, as | θ | for it is a certain be greater than 0 ° of angle when, at two springs In drift l₀, the structure is generally in equilibrium state at this time；When θ=0 °, two lengths are l, l < l₀, two bullet at this time Spring is in compressive state, and structure is generally in non-equilibrium state.

The scatterer oscillator of the bistable state NES and protrusion setting being stacked by soft material and hard material is in parent plate It is upper to be arranged for unilateral or bilateral.

The small mass block of the bistable state NES is cylinder, cuboid or spherical shape；The shape for rigidly fixing end is Cylindrical or cuboid.

The shape of the soft material and hard material is identical or different, for cylindrical or cuboid.

The small mass block of described matrix plate bistable state NES and the thickness of soft material, hard material are identical or different.

The smallest repetitive unit of the bistable state NES composition periodic structure of the described m row n column is called unit cell, each unit cell it Between spread geometry be square, equilateral triangle or other polygons.

The material of described matrix plate is metal, concrete, ceramics, fibre reinforced composites or rubber or polyurethane material Material.

The soft material is the high molecular materials such as rubber or polyurethane；The material of the small mass block of hard material and bistable state NES Material is metal, concrete, ceramics or fibre reinforced composites.

The utility model has the advantages that compared with prior art, present invention has the advantage that

1) periodic structure is small relative to other impact energy absorber part sizes, low cost.It is easy to make simultaneously, it is convenient for Standardized production.

2) big machinery often will appear wideband feature in complicated dynamics environment.The previous vibration for being directed to wideband structure Dynamic control, mainly applies active-passive integratedization vibration isolation technique.However, for the vibration control mechanism with wideband feature, main quilt Movement and motor-driven integrative vibration control technology is difficult to adapt to complex working condition.And distinctive stable state transition can be improved efficiently in bistable state NES The sphere of action of target energy transmission.Simultaneously have small additional mass, vibration suppression bandwidth, achievable orientation target energy transmission, High reliablity, strong robustness are not necessarily to extraneous the advantages that providing the energy.

Detailed description of the invention

Fig. 1 is that the small mass block of bistable state NES of the present invention is spherical periodic structure figure；

Fig. 2 is the unit cell figure of Fig. 1 periodic structure of the present invention；

Fig. 3 is that the small mass block of bistable state NES of the present invention is the periodic structure figure of cuboid；

Fig. 4 is that the small mass block of the bistable state NES of rebuilding of the present invention is spherical periodic structure figure；

Fig. 5 is top view of the periodic structure of the present invention according to equilateral triangle arrangement；

Fig. 6 is the periodic structure figure that the present invention is additionally provided with cylindrical oscillator between parent plate and bistable state NES；

Fig. 7 is the unit cell figure of Fig. 6 periodic structure of the present invention；

Fig. 8 is the planar structure schematic diagram of bistable state NES of the present invention.

Have in figure: plate matrix 1, bistable state nonlinear energy trap 2, spring 2-1, damper 2-2, small mass block 2- 3, end 3, soft material layer 4, hard material layer 5 are rigidly fixed.

Specific embodiment

Implementation method of the invention is as follows:

The periodic structure includes plate matrix, and is arranged in protrusion on the plate matrix according to periodicity or relaxed periodicity The bistable state NES of the m row n column of setting；Wherein bistable state NES is made of two springs, a damper and a small mass block； Each spring is consolidated by rigidly fixing end with plate matrix；The surface of the axis perpendicular to plate matrix at end is rigidly fixed, Spring one end is connected with end is rigidly fixed, and the other end is connected with small mass block；Damper one end is connected with small mass block, the other end It is connected with plate matrix surface.

The bistable state nonlinear energy trap of m row n column is arranged on parent plate according to periodicity or relaxed periodicity； The oscillator being stacked by one layer of soft material and hard material can be set between parent plate and each bistable state nonlinear energy trap. Bistable state nonlinear energy trap and oscillator can be arranged in the unilateral side of parent plate or bilateral.It is arranged between each unit cell of periodic structure The shape of column can be square, triangle or other polygons.The material of parent plate can be metal, concrete, ceramics, fibre The dimension enhancing materials such as composite material or rubber, polyurethane.Soft material can be the high molecular materials such as rubber or polyurethane.Hard material It can be metal, concrete, ceramics or fibre reinforced composites with the material of the small mass block of bistable state nonlinear energy trap Deng.

With reference to the accompanying drawing, by embodiment, invention is further described in detail: