CN111043213A

CN111043213A - Stable-state controllable laminated compression bar and transient vibration suppression structure based on same

Info

Publication number: CN111043213A
Application number: CN201911257323.8A
Authority: CN
Inventors: 方辉; 孟祥剑; 段利亚; 李华军; 刘勇
Original assignee: Ocean University of China
Current assignee: Ocean University of China
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-04-21
Anticipated expiration: 2039-12-10
Also published as: CN111043213B

Abstract

The invention discloses a stable controllable laminating compression bar and a transient vibration suppression structure based on the same, wherein the stable controllable laminating compression bar comprises a rigid material layer and a low-modulus material layer which are vertically arranged, the rigid material layer is of an eccentric structure, the low-modulus material layer is fixed on the rigid material layer, and the arrangement direction of the low-modulus material layer is opposite to the eccentric side of the rigid material layer; the laminated compression bar is formed by compounding a rigid material layer and a low-modulus material layer, the rigid material layer adopts an eccentric structure, and the axial rigidity of the compounded laminated compression bar is basically consistent with that of a compression bar with a rigid eccentric structure with the same specification; however, due to the constraint effect of the low-modulus material layer, the central shaft of the laminated compression bar is obviously deviated when the laminated compression bar is bent, so that the equivalent rigidity of the bent laminated compression bar is increased, the steady-state conversion threshold value is greatly increased, and the hysteresis loop area of the laminated compression bar is far larger than that of a rigid eccentric structure compression bar with the same specification.

Description

Stable-state controllable laminated compression bar and transient vibration suppression structure based on same

Technical Field

The invention relates to the technical field of oceans and ships, in particular to a steady-state controllable laminated compression bar and a transient vibration suppression structure based on the same.

Background

The marine and marine engineering structure must bear short-time high-amplitude load (such as slamming) and then generates transient vibration, and because the inherent damping of the structural metal is extremely small, the transient vibration is continuously transmitted, the structural damage is gradually accumulated and finally destroyed, and the effective implementation of transient vibration suppression becomes an important requirement for ensuring the safety of the marine engineering structure.

In the traditional vibration suppression method, viscoelastic materials and the like are introduced into a structure, and according to a linear principle, the materials need to reach a certain proportion to realize effective dissipation, but the materials have low rigidity, so that the integral rigidity of the structure is reduced. Within the linear principle range, if the structural design meets the rigidity requirement, effective dissipation cannot be realized, and if the high dissipation design is adopted, the bearing requirement cannot be met.

Disclosure of Invention

In view of the defects in the prior art, the invention aims to provide a steady-state controllable layer laminating pressure rod which is applied to a transient vibration suppression structure, so that the suppression structure has high rigidity and high dissipation at the same time.

Further, the invention provides a transient vibration suppression structure based on the steady-state controllable layer laminating compression bar.

The technical scheme adopted by the invention is as follows:

the stable controllable laminating compression bar comprises a rigid material layer and a low-modulus material layer which are vertically arranged, wherein the rigid material layer is of an eccentric structure, the low-modulus material layer is fixed on the rigid material layer, and the arrangement direction of the low-modulus material layer is opposite to the eccentric side of the rigid material layer.

Further, a notch is vertically formed in one side of the rigid material layer, and the low-modulus material layer is fixed to one side of the notch of the rigid material layer.

Further, the rigid material layer is made of a metal material.

Further, the low modulus material layer is made of polymethyl methacrylate, resin, or plastic.

Further, the low modulus material layer is adhered to the rigid material layer.

Further, the invention provides a transient vibration suppression structure based on a steady-state controllable laminating compression bar, which comprises an upper pressure plate, a lower pressure plate, a linear spring, a first shell and a second shell, wherein the linear spring is connected between the upper pressure plate and the lower pressure plate in a tensioning manner, the long axes of the first shell and the second shell are superposed, and the short axes of the first shell and the second shell are vertically crossed and matched together; the lower side of the upper end face of the first shell is provided with a first bulge, the lower end face of the first shell is provided with a first through hole, the upper side of the lower end face of the second shell is provided with a second bulge, the upper end face of the second shell is provided with a second through hole, the first bulge is telescopically assembled in the second through hole, the second bulge is telescopically assembled in the first through hole, the height of the first bulge is greater than the depth of the second through hole, and the height of the second bulge is greater than the depth of the first through hole; the device also comprises a layer laminating compression bar, the layer laminating compression bar adopts the stable controllable layer laminating compression bar, the layer laminating compression bar is clamped between the upper pressure plate and the lower pressure plate, and the rigidity of the first shell and the second shell is greater than that of the layer laminating compression bar.

Further, the installation position of the laminating compression bar is coincident with the long axes of the first shell and the second shell.

Further, the laminated pressing rod, the upper pressing plate, the lower pressing plate, the linear spring, the first shell and the second shell are all made of steel.

Further, the laminated compression bar has a local bending configuration and a bending configuration in sequence during the process of gradually increasing the compression load.

By adopting the technical scheme, the invention has the following beneficial effects:

the laminated compression bar is formed by compounding a rigid material layer and a low-modulus material layer, the rigid material layer adopts an eccentric structure, and the axial rigidity of the compounded laminated compression bar is basically consistent with that of a compression bar with a rigid eccentric structure with the same specification; however, due to the constraint effect of the low-modulus material layer, the central shaft of the laminated compression bar is obviously deviated when the laminated compression bar is bent, so that the equivalent rigidity of the bent laminated compression bar is increased, the steady-state conversion threshold value is greatly increased, and the hysteresis loop area of the laminated compression bar is far larger than that of a rigid eccentric structure compression bar with the same specification. The steady-state controllable laminating pressure lever is applied to the transient vibration suppression structure, and the transient vibration suppression effect of the transient vibration suppression structure can be obviously improved.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a schematic view of a steady state controllable layer laminating compression bar according to an embodiment of the present invention;

fig. 2 is a transient vibration suppression structure based on the above-described laminated pressing rod according to the embodiment of the present invention;

FIG. 3a is a schematic structural view of a laminated compression bar in a straightened state according to an embodiment of the present invention;

FIG. 3b is a schematic view of a laminated compression bar according to an embodiment of the present invention in a partially bent state;

FIG. 3c is a schematic view of a laminated compression bar according to an embodiment of the present invention in a bent state;

FIG. 4 is a load-displacement graph of a laminated compression bar and an eccentrically constructed compression bar without a layer of low modulus material in accordance with an embodiment of the present invention;

FIG. 5 is a transient vibration attenuation curve for a laminated strut and an eccentrically constructed strut without a layer of low modulus material according to an embodiment of the present invention.

Wherein, 1 is the lamination depression bar, 11 is the rigidity material layer, 12 is the low modulus material layer, 2 is the top board, 3 is the holding down plate, 4 is linear spring, 5 is first shell, 51 is first arch, 6 is the second shell, 61 is the second through-hole.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

Referring to fig. 1, the steady-state controllable laminating compression bar 1 comprises a rigid material layer 11 and a low modulus material layer 12 which are vertically arranged, wherein the rigid material layer 11 is of an eccentric structure, and the low modulus material layer 12 is fixed on the rigid material layer 11 and is arranged in the direction opposite to the eccentric side of the rigid material layer 11.

The laminated compression bar 1 is formed by compounding a rigid material layer 11 and a low-modulus material layer 12, the rigid material layer 11 adopts an eccentric structure, and the axial rigidity of the laminated compression bar 1 formed by compounding is basically consistent with that of a compression bar with a rigid eccentric structure with the same specification; however, due to the constraint action of the low-modulus material layer 12, the central axis of the laminated compression bar 1 is significantly deviated during bending, so that the equivalent stiffness of the bent laminated compression bar 1 is increased, the steady-state conversion threshold value is greatly increased, and the hysteresis loop area of the laminated compression bar 1 is far larger than that of a rigid eccentric structure compression bar with the same specification. The steady-state controllable laminated compression bar 1 is applied to a transient vibration suppression structure, and the transient vibration suppression effect can be obviously improved.

Preferably, the rigid material layer 11 is made of a metal material, and specifically, the rigid material layer 11 is made of steel. The low modulus material layer 12 is made of a low modulus polymer, specifically, polymethyl methacrylate, resin or plastic. One side of the rigid material layer 11 is vertically provided with a notch, the low-modulus material layer 12 is fixed on one side of the notch of the rigid material layer 11, and specifically, the low-modulus material layer 12 is adhered to the rigid material layer 11.

Referring to fig. 2, further, the invention provides a transient vibration suppression structure based on a steady-state controllable laminating pressure rod 1, which comprises a laminating pressure rod 1, an upper pressure plate 2, a lower pressure plate 3, a linear spring 4, a first shell 5 and a second shell 6. The laminating pressure bar 1 adopts the stable controllable laminating pressure bar 1, and the laminating pressure bar 1 is clamped between the upper pressure plate 2 and the lower pressure plate 3. Linear spring 4 is connected in a tensioned manner between upper pressure plate 2 and lower pressure plate 3, the major axis coincidence of first shell 5 and second shell 6, minor axis are crossed and matched together perpendicularly, the up end of second shell 6 is located the downside of the up end of first shell 5, the lower end of second shell 6 is located the downside of the lower end of first shell 5, upper pressure plate 2 is hugged closely the downside of the up end of second shell 6, lower pressure plate 3 is hugged closely the upside of the lower end of first shell 5. The lower side of the upper end face of the first housing 5 is provided with a first protrusion 51, the lower end face of the first housing 5 is provided with a first through hole, the upper side of the lower end face of the second housing is provided with a second protrusion, the upper end face of the second housing is provided with a second through hole 61, the first protrusion 51 is telescopically assembled in the second through hole 61, the second protrusion is telescopically assembled in the first through hole, the height of the first protrusion 51 is greater than the depth of the second through hole 61, and the height of the second protrusion is greater than the depth of the first through hole. The stiffness of the first and second shells is greater than the stiffness of the laminated compression bar 1.

In one aspect of the embodiment of the present invention, the linear springs 4 have two, symmetrically connected between the upper platen 2 and the lower platen 3 with respect to the laminating press bar 1, and the linear springs 4 are parallel to the laminating press bar 1. The laminated compression bar 1 and the linear spring 4 are jointly arranged between the upper pressure plate 2 and the lower pressure plate 3 to form a bearing structure, the bearing structure is pre-compressed and then is installed between the first shell 5 and the second shell 6, the upper pressure plate 2, the lower pressure plate 3, the laminated compression bar 1, the first shell 5 and the second shell 6 are in close and stable contact, and the rigidity of the first shell 5 and the rigidity of the second shell 6 are far greater than that of the laminated compression bar 1; preferably, the rigidity of the first and

second housings

5 and 6 is 20 to 40 times the rigidity of the laminated pressure lever 1.

In one aspect of the present embodiment, the mounting position of the laminated strut 1 coincides with the long axis of the first and

second shells

5, 6. To ensure the vertical stress of the laminated press rod 1.

In one aspect of the embodiment of the present invention, the upper side of the upper end surface of the first housing 5 is fixedly connected to the isolated structure, and the lower side of the lower end surface of the second housing 6 is fixedly connected to the support structure; or the upper side of the upper end surface of the first shell 5 is fixedly connected with the supporting structure, and the lower side of the lower end surface of the second shell 6 is fixedly connected with the isolated structure.

In one aspect of the embodiment of the present invention, the first housing 5 and the second housing 6 have the same structure and are both rectangular frame-shaped structures. Preferably, the materials of the laminated press rod 1, the upper press plate 2, the lower press plate 3, the linear spring 4, the first shell 5 and the second shell 6 are all steel. So as to realize the optimization of the structure and the mechanical property of the device.

In one aspect of the present embodiment, the laminating press bar 1 comprises a rigid material layer 11 and a low modulus material layer 12, and the laminating press bar 1 is subjected to a local bending configuration and a bending configuration in sequence during the process of gradually increasing compressive load.

When the restraining structure is used, the axial direction of the restraining structure is consistent with the load acting direction, if an external tensile load acts on the upper end of the first shell 5, the second shell 6 is fixed, the first shell 5 moves along the tensile direction, the displacement of the upper pressure plate 2 is restrained by the upper end of the second shell 6, and the laminated pressure rod 1 bears the compressive stress. If the first shell 5 moves along the compression direction, the second shell 6 is fixed, the first bulge 51 connected to the lower side of the upper end surface of the first shell 5 penetrates through the second through hole 61 of the upper end surface of the second shell to apply load on the upper pressure plate 2, the lower pressure plate 3 at the lower end of the laminated pressure lever 1 is constrained by the lower end of the second shell 6, the second bulge at the upper side of the lower end surface of the second shell 6 penetrates through the first through hole of the lower end surface of the first shell 5 to abut against the lower pressure plate 3, and at the moment, the laminated pressure lever 1 still bears the pressure stress. The rigidity of the first and

second housings

5, 6 is much greater than that of the laminated pressure lever 1, and the deformation of the first and

second housings

5, 6 in the above process is negligible. It can be seen that no matter the restraining structure bears the tensile and compression action on the upper end of the first shell 5 or the tensile and compression action on the lower end of the second shell 6, the laminated compression bar 1 bears the compressive stress, when the load reaches the elastic buckling threshold of the laminated compression bar 1, the stable state conversion occurs, the straight bar configuration is converted into the bent configuration, for example, the straight bar configuration in fig. 3a, the partial bent configuration in fig. 3b, and the bent configuration in fig. 3c, and the bent configuration rebounds to the straight bar during unloading. The laminated compression bar 1 is changed from axial compression bearing to bending bearing, the rigidity of the laminated compression bar is greatly reduced, the laminated compression bar rebounds from a low potential energy state during unloading, so that a phase difference exists between load and displacement (as shown in a load-displacement curve chart of the laminated compression bar 1 shown in fig. 4, wherein the load unit is N, and the displacement unit is m), namely hysteresis dissipation is generated, external force acting is firstly converted into elastic potential energy of a straight bar in the process, after steady state conversion, the rigidity of the bent bar is reduced, the potential energy storage capacity of the bent bar is greatly reduced, original potential energy is converted into kinetic energy after being released, the kinetic energy is dissipated in a coulomb damping or sound energy mode, under the combined action of structure softening and hysteresis dissipation, external high acceleration excitation is isolated, and the acceleration of isolated equipment is. The rigid material layer 11 is made of structural steel materials, has high rigidity in a static state, and the laminated compression bar 1 is elastically bent when impact load acts, a plurality of stable balance states sequentially appear, and hysteresis loop is generated under the action of cyclic load, so that energy dissipation is realized. In consideration of the above processes, compared with the existing rigid eccentric structure compression bar without the low modulus material layer 12, the initial stiffness of the compression bar is similar under the cyclic load (fig. 4), the buckling of the rigid eccentric structure compression bar occurs earlier along with the increase of the load, the buckling threshold of the laminated compression bar 1 is obviously increased, after the load cycle is completed, the hysteresis loop area of the laminated compression bar 1 is far larger than that of the existing rigid eccentric structure compression bar, the two generate transient vibration under the action of impact load, and the transient vibration of the laminated compression bar 1 is suppressed more quickly compared with the existing rigid eccentric structure compression bar in the prior art (fig. 5).

In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral combinations thereof; may be an electrical connection; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, systems, and techniques have not been shown in detail in order not to obscure an understanding of this description.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, system, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, systems, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims

1. The steady-state controllable laminating compression bar is characterized by comprising a rigid material layer (11) and a low-modulus material layer (12) which are vertically arranged, wherein the rigid material layer (11) is of an eccentric structure, and the low-modulus material layer (12) is fixed on the rigid material layer (11) and is arranged in the direction opposite to the eccentric side of the rigid material layer (11).

2. A steady state controllable layer laminating pressure bar according to claim 1, characterised in that one side of the layer of rigid material (11) is vertically notched and the layer of low modulus material (12) is fixed to the notched side of the layer of rigid material (11).

3. A steady state controllable layer laminating pressure bar according to claim 1 or 2, characterized in that the rigid material layer (11) is made of a metallic material.

4. Steady-state controllable layer laminating pressure bar according to claim 1 or 2, characterized in that the layer of low modulus material (12) is made of polymethylmethacrylate, resin or plastic.

5. A steady state controllable layer laminating pressure bar according to claim 1 or 2, characterised in that the layer of low modulus material (12) is glued to the layer of rigid material (11).

6. The transient vibration suppression structure based on the steady-state controllable laminated compression bar comprises an upper pressure plate (2), a lower pressure plate (3), a linear spring (4), a first shell (5) and a second shell (6), wherein the linear spring (4) is connected between the upper pressure plate (2) and the lower pressure plate (3) in a tensioning mode, the long axes of the first shell (5) and the second shell (6) are overlapped, the short axes of the first shell (5) and the second shell (6) are vertically crossed and matched together, the upper end face of the second shell (6) is located on the lower side of the upper end face of the first shell (5), the lower end face of the second shell (6) is located on the lower side of the lower end face of the first shell (5), the upper pressure plate (2) is tightly attached to the lower side of the upper end face of the second shell (6), and the lower pressure plate (3) is tightly attached to the upper side of the lower end face of the first shell (5; the lower side of the upper end face of the first shell (5) is provided with a first bulge (51), the lower end face of the first shell (5) is provided with a first through hole, the upper side of the lower end face of the second shell (6) is provided with a second bulge, the upper end face of the second shell (6) is provided with a second through hole (61), the first bulge (51) is telescopically assembled in the second through hole (61), the second bulge is telescopically assembled in the first through hole, the height of the first bulge (51) is greater than the depth of the second through hole, and the height of the second bulge is greater than the depth of the first through hole; it is characterized in that the preparation method is characterized in that,

the laminated compression bar (1) is a stable controllable laminated compression bar (1) as claimed in any one of claims 1-5, the laminated compression bar (1) is clamped between the upper pressure plate (2) and the lower pressure plate (3), and the rigidity of the first shell (5) and the second shell (6) is larger than that of the laminated compression bar (1).

7. The transient vibration suppression structure based on a steady state controllable layer lamination strut (1) according to claim 6, characterized in that the installation position of the lamination strut (1) coincides with the first shell (5) and the second shell (6) long axis.

8. The transient vibration suppression structure based on the steady-state controllable lamination pressure bar according to claim 6, characterized in that the materials of the lamination pressure bar (1), the upper pressure plate (2), the lower pressure plate (3), the linear spring (4), the first housing (5) and the second housing (6) are all steel.

9. The transient vibration suppression structure based on a steady state controllable lamination pressure bar according to claim 6, characterized in that the lamination pressure bar (1) exhibits a local bending configuration and a bending configuration in sequence during the process of gradually increasing applied compressive load.