阅读说明：本技术 几何非线性隔振系统 (Geometric non-linear vibration isolation system ) 是由 张家铭 黄谢恭 杨卓谚 于 2018-10-09 设计创作，主要内容包括：本发明提供了一种几何非线性隔振系统,其包括一承载台、一隔振器及一阻尼件。该隔振器连接该承载台,用以于承载台与隔振器间产生水平相对位移时提供一恢复力。该阻尼件铰接至该承载台,且阻尼件的轴线与水平方向呈正交或斜交。据此,当该承载台与该隔振器间沿该水平方向产生相对位移时,该阻尼件的该轴线与该水平方向间的夹角会随之改变,且该阻尼件会沿着平行该轴线的方向提供一阻尼力,以提升水平隔振效果。(The invention provides a geometric non-linear vibration isolation system which comprises a bearing platform, a vibration isolator and a damping piece. The vibration isolator is connected with the bearing platform and is used for providing restoring force when horizontal relative displacement is generated between the bearing platform and the vibration isolator. The damping piece is hinged to the bearing table, and the axis of the damping piece is orthogonal or oblique to the horizontal direction. Therefore, when the plummer and the vibration isolator generate relative displacement along the horizontal direction, the included angle between the axis of the damping piece and the horizontal direction can be changed along with the displacement, and the damping piece can provide a damping force along the direction parallel to the axis so as to improve the horizontal vibration isolation effect.)

1. A geometric non-linear vibration isolation system comprising:

the bearing table is used for mounting an object to be isolated;

a vibration isolator connected with the bearing platform, and a reset mechanism is assembled between the vibration isolator and the bearing platform and used for providing restoring force when the bearing platform and the vibration isolator generate relative displacement along a horizontal direction; and

and the damping part is hinged to the bearing platform, an axis of the damping part is orthogonal or oblique to the horizontal direction under the action of no external force, when the bearing platform and the vibration isolator generate relative displacement along the horizontal direction, an included angle between the axis of the damping part and the horizontal direction is changed along with the relative displacement, and the damping part provides a damping force along a direction parallel to the axis.

2. The system of claim 1, wherein the isolator is disposed below the carrier and opposite ends of the damping member are hinged to the carrier and the isolator, respectively.

3. The system of claim 2, wherein the restoring mechanism comprises at least one sliding slot and at least one sliding member, the sliding slot has a concave surface, and the sliding member slidably abuts against and contacts the concave surface of the sliding slot.

4. The system of claim 3, wherein the sliding member is located at the most concave point of the concave arc surface when no external force is applied.

5. The geometric nonlinear vibration isolation system of claim 3, wherein the vibration isolator comprises a support base and the at least one sliding member, the at least one sliding slot is formed on the bottom side of the carrier, and the at least one sliding member is disposed between the support base and the at least one sliding slot.

6. The system of claim 5, wherein the support base of the isolator has a base and at least one support member, the support member is vertically fixed to the base, and the sliding member is disposed at a top end of the support member.

7. The system of claim 6, wherein the damping member is disposed vertically or diagonally between the carrier and the base.

8. The system of claim 1, wherein the axis of the damping member is orthogonal to the horizontal direction when no external force is applied, the greater the relative displacement between the platform and the isolator, the greater the stretching of the damping member and the smaller the slope of the axis.

Technical Field

The invention relates to a geometric nonlinear vibration isolation system, in particular to a geometric nonlinear horizontal vibration isolation system.

Background

In recent years, various vibration isolation techniques have been actively developed to reduce disasters and damage caused by earthquakes. In particular, when the precision instruments or equipment in the factory building are damaged by earthquake, the loss often exceeds the value of the building, so it is important to develop a vibration isolation technique which can effectively reduce the damage of the instruments or equipment in the factory building caused by earthquake.

Most of the existing vibration isolation systems utilize damping members to improve the energy dissipation capability of the system when the system is subjected to vibration, and the damping members are generally installed in a manner parallel to the moving direction to achieve the purpose of maximum energy dissipation. As shown in fig. 1, a horizontal vibration isolation system 100 of the prior art is provided with a damping member 13 and an elastic member 15 horizontally mounted on a vibration isolation platform 11 for energy dissipation and vibration reduction in the horizontal direction. However, the horizontal vibration isolation system 100 of the prior art adopts a linear vibration isolation mechanism, which has a fixed vibration isolation frequency, and when the external vibration force approaches the natural frequency of the system, the vibration isolation system is likely to generate a resonance effect, so that the displacement and the acceleration of the vibration isolation platform 11 in the horizontal direction are amplified, and the vibration isolation effect is poor.

In view of this, there is a need to develop a nonlinear vibration isolation system capable of effectively avoiding resonance, so as to reduce the resonance characteristics of the vibration isolation system itself, avoid the excessive amplification reaction caused by resonance, and further break through the limitation of the conventional linear vibration isolation system, so as to realize vibration isolation of a large range of frequencies and improve the vibration isolation effect.

Disclosure of Invention

An object of the present invention is to provide a geometric non-linear vibration isolation system, which achieves a non-linear vibration isolation effect by disposing a damping member vertically or obliquely, so as to reduce the resonance characteristics of the vibration isolation system itself, avoid the over-amplification effect caused by resonance, and effectively reduce the damage of the vibration isolator to be subjected to horizontal vibration waves.

To achieve the above object, the present invention provides a geometric non-linear vibration isolation system comprising: the bearing table is used for mounting an object to be isolated; a vibration isolator connected with the bearing platform, and a reset mechanism is assembled between the vibration isolator and the bearing platform and used for providing restoring force when the bearing platform and the vibration isolator generate relative displacement along a horizontal direction; and a damping part which is hinged to the bearing platform, and under the action of no external force, an axis of the damping part is orthogonal or oblique to the horizontal direction, when the bearing platform and the vibration isolator generate relative displacement along the horizontal direction, an included angle between the axis of the damping part and the horizontal direction can be changed along with the relative displacement, and the damping part can provide a damping force along the direction parallel to the axis.

Therefore, the geometric non-linear vibration isolation system can be applied to vibration isolation of equipment (such as precision instruments or equipment), restoring force can be provided through the reset mechanism, and the non-linear vibration isolation effect is achieved by using the damping piece which is arranged orthogonally or obliquely, so that the vibration degree of the body to be isolated in the horizontal direction is reduced, and the body to be isolated is prevented from being seriously damaged by vibration waves in the horizontal direction.

In the present invention, the reset mechanism can be any mechanism that can provide a horizontal reset function. For example, a preferred embodiment of the present invention utilizes a sliding type reset mechanism, wherein the reset mechanism comprises at least one sliding slot and at least one sliding member, the sliding slot has a concave arc surface, and the sliding member slidably abuts against and contacts the concave arc surface of the sliding slot. Therefore, when the system is in an initial state without external force (such as seismic force), the sliding piece is located at the position of the most concave point of the concave arc surface, and when the system is subjected to the external force, the plummer and the vibration isolator can be in sliding fit by using an arc line, so that the effect of resetting after displacement is achieved.

In the invention, the vibration isolator can be arranged below the bearing platform, and two opposite ends of the damping piece can be respectively hinged to the bearing platform and the vibration isolator. For further example, the vibration isolator may include a supporting base and the sliding member, and the sliding groove may be formed on the bottom side of the supporting base, wherein the supporting base may have a bottom platform and at least one supporting member vertically fixed on the bottom platform, and the sliding member may be disposed on the top end of the supporting member and between the supporting base and the sliding groove. Therefore, the two opposite ends of the damping piece can be respectively hinged to the bearing platform and the base platform of the vibration isolator to be vertically or obliquely arranged between the bearing platform and the base platform.

In the present invention, when the damping member is installed in the system in a manner that the axis is orthogonal to the horizontal direction, the greater the relative displacement between the plummer and the vibration isolator, the greater the stretching amount of the damping member and the smaller the slope of the axis of the damping member (i.e., the greater the proportion of the horizontal component of the damping force). Therefore, under the condition of small and medium earthquake displacement, the damping piece can provide relatively small damping ratio, effectively exert the original efficiency of the vibration isolation system and maximize the effect of the vibration isolation system; under the condition of large earthquake displacement, the damping piece can provide a relatively large damping ratio, can effectively control the displacement of the vibration isolation layer and provides an effective energy dissipation mechanism.

In the present invention, "axial slope" is based on the definition relative to the horizontal direction. For example, when the axis of the damping member is parallel to the horizontal direction, the slope of the axis is defined as 0, and when the slope of the axis of the damping member is larger, this means that the horizontal component of the damping force provided by the damping member is smaller.

In order to make the aforementioned objects, features and advantages comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic view of a prior art horizontal vibration isolation system;

FIG. 2 is a schematic view of a geometric nonlinear vibration isolation system according to embodiment 1 of the present invention;

fig. 3 is a schematic diagram illustrating a displacement state of the geometric nonlinear vibration isolation system under the action of an external force according to embodiment 1 of the present invention;

FIG. 4 is a schematic view of a geometric nonlinear vibration isolation system according to embodiment 2 of the present invention;

fig. 5 to 7 are schematic views illustrating a displacement state of the geometric nonlinear vibration isolation system under the action of an external force in embodiment 2 of the present invention;

FIG. 8 is a graph showing the response of the system acceleration with horizontally mounted dampers and vertically mounted dampers;

FIG. 9 is a graph showing the response of the system displacement between the horizontally mounted damper and the vertically mounted damper.

[ notation ] to show

Vibration isolation system 100, 200, 300

Vibration isolation platform 11

Damping element 13, 60

Elastic member 15

Bearing table 20

Chute 21

Vibration isolator 40

Bearing block 41

Base table 411

Support 413

Sliding member 43

Horizontal direction D

Body M to be isolated

Axis X

First contact point P1

Second contact point P2

Length L of articulation_o

Length of stretch L_d

Compressed length L_c

Detailed Description

The following description of the embodiments of the present invention is provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. It should be noted that the following drawings are simplified schematic drawings, the number, shape and size of the elements in the drawings can be changed freely according to the actual implementation conditions, and the layout state of the elements can be more complicated. The invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention.

[ example 1]

Please refer to fig. 2, which is a schematic diagram of a geometric nonlinear vibration isolation system 200 according to an embodiment of the present invention. As shown in fig. 2, the geometric nonlinear vibration isolation system 200 of the present embodiment includes a loading platform 20, a vibration isolator 40 and a damping member 60, wherein the loading platform 20 is used for mounting a to-be-isolated object M thereon, and a reset mechanism is formed between the loading platform 20 and the vibration isolator 40, so that a mechanism of resetting after horizontal relative displacement can be generated between the loading platform 20 and the vibration isolator 40, so as to reduce and isolate the transmission of horizontal vibration, and the damping member 60 is hinged to the loading platform 20, so as to provide a damping force when horizontal relative displacement is generated between the loading platform 20 and the vibration isolator 40. A feature of the present embodiment is that, in an initial state without being subjected to an external force (such as a seismic force), the axis X of the damping member 60 is orthogonal to the horizontal direction D of the platform 20 (see fig. 2), when the platform 20 and the vibration isolator 40 generate a horizontal relative displacement due to the external force, an included angle between the axis X of the damping member 60 and the horizontal direction D of the platform 20 changes, and the damping member 60 provides a damping force along a direction parallel to the axis X (see fig. 3).

The following describes the structure of the main components and the connection relationship of the geometric non-linear vibration isolation system 200 in this embodiment in detail. Here, the sliding type returning mechanism is further exemplified in the embodiment, but the returning mechanism of the present invention can be designed into any other mechanism with a horizontal returning function according to the actual requirement, for example, the returning mechanism can also utilize the elastic deformation restoring force of a spring or metal to provide the horizontal returning function.

The vibration isolator 40 of the present embodiment comprises a supporting base 41 and two sliding members 43, wherein the supporting base 41 has a bottom platform 411 and two supporting members 413 vertically fixed on the bottom platform 411, and the two sliding members 43 are respectively disposed on the top ends of the two supporting members 413 and slidably abut against the bottom side of the supporting platform 20. Furthermore, the bottom side of the carrier 20 forms a sliding slot 21 having a concave arc surface, and the sliding member 43 slidably abuts against and contacts the concave arc surface of the sliding slot 21. In the initial state without external force (such as seismic force), the sliding member 43 is located at the position of the most concave point of the sliding slot 21 (see fig. 2), when the system is subjected to external force (such as seismic force), the bearing platform 20 and the vibration isolator 40 will generate horizontal relative displacement through a sliding mechanism (see fig. 3), and the concave arc surface design of the sliding slot 21 can provide the effect of resetting after displacement, so as to reduce the influence of vibration waves on the vibration isolator M in the horizontal direction. In addition, since the opposite ends of the damping member 60 are hinged to the platform 20 and the base 411 of the vibration isolator 40, when the platform 20 moves horizontally relative to the vibration isolator 40, the opposite ends of the damping member 60 also move horizontally relative to each other, and the damping member 60 is changed from the orthogonal initial state (see fig. 2) to the oblique stretching state (see fig. 3), so that the damping member 60 in the oblique stretching state can provide a damping force along a direction parallel to the axis X, and the horizontal component of the damping force can absorb the energy of the vibration transmitted in the horizontal direction, thereby achieving the effects of vibration damping and vibration isolation.

Furthermore, under the condition of no external force (such as seismic force), the damping member 60 is in an initial state vertically disposed between the supporting platform 20 and the base platform 411, and the hinge length between the first joint P1 hinged to the supporting platform 20 and the second joint P2 hinged to the base platform 411 is L_o(please refer to fig. 2), when the platform 20 and the vibration isolator 40 are displaced relative to each other in the horizontal direction D by an external force, the length from the first point P1 to the second point P2 of the damping member 60 is extended to the elongation L_d(see FIG. 3), wherein the greater the horizontal relative displacement between the platform 20 and the vibration isolator 40, the greater the amount of tension (L) of the damping member 60_d-L_o) The greater the slope of the axis X of the damping member 60 (i.e., the smaller the ratio of the vertical component to the horizontal component of the damping force), and conversely, the smaller the amount of horizontal relative displacement between the platform 20 and the vibration isolator 40, the greater the amount of tension (L) of the damping member 60_d-L_o) The smaller the slope of the axis X of the damping member 60 (i.e., the greater the ratio of the vertical to horizontal components of the damping force). Accordingly, since the horizontal damping force provided by the damping member 60 varies in a non-linear manner in a trigonometric function relationship, the resonance characteristics of the vibration isolation system can be reduced, and an over-amplification reaction caused by resonance can be avoided, thereby breaking through the limitation of the conventional linear vibration isolation system. The hinge length L of the damping element 60 is in this case_oAnd the damping coefficient C will influence the energy dissipation and vibration isolation effect of the system, so that proper parameter design can be made according to the requirement to realize the required vibration isolation effect. In addition, in the vibration isolation system with the damping member installed horizontally in the prior art, the initial position of the horizontal damping member must be set at a half-stroke position to cope with the stretching and compressing actions generated in different horizontal vibration directions; however, in the vibration damping system in which the damping member is installed in the vertical direction, since the damping member is changed in tension regardless of the horizontal vibration direction, the initial position of the damping member in the vertical direction can be set at the lowest point of the stroke. Thereby, compared with the prior art that the damping part is arranged horizontally, the stroke required by the damping part arranged vertically is smallerTherefore, the vibration isolation system of the invention can select a damping part with shorter stroke so as to reduce the cost of the system.

[ example 2]

For the purpose of brief description, any description that can be applied to the same in embodiment 1 is incorporated herein, and the same description need not be repeated.

Please refer to fig. 4, which is a schematic diagram of a geometric nonlinear vibration isolation system 300 according to another embodiment of the present invention. The geometric nonlinear vibration isolation system 300 of the present embodiment is substantially the same as that of embodiment 1, except that the damping member 60 of the present embodiment is obliquely disposed between the load-bearing platform 20 and the base platform 411.

More specifically, as shown in fig. 4, under the condition of no external force (such as seismic force), the axis X of the damping member 60 is oblique to the horizontal direction D, and the sliding member 43 is located at the most concave point of the sliding slot 21. When the platform 20 and the vibration isolator 40 move relatively in the direction of the arrow shown in fig. 5 due to external force, the length from the first connection point P1 to the second connection point P2 of the damping member 60 is changed from the original hinge length L_oIs stretched to an elongation L_dWherein the greater the horizontal relative displacement between the platform 20 and the vibration isolator 40, the greater the amount of tension (L) of the damping member 60_d-L_o) The larger and the smaller the slope of the axis X of the damping member 60 (i.e., the smaller the ratio between the vertical and horizontal components of the damping force). In addition, when the platform 20 and the vibration isolator 40 move relatively in the direction of the arrow shown in fig. 6 due to external force, the length from the first point P1 to the second point P2 of the damping member 60 will be changed from the original hinge length L_oIs compressed to a compressed length L_cAnd the slope of the axis X of the damping member 60 increases with the displacement until the damping member 60 is in a vertical state as shown in fig. 6, and the damping member 60 reaches the lowest point of the stroke. As the vibration isolator 40 continues to move relatively in the direction of the arrow shown in fig. 7, the slope of the axis X of the damping member 60 decreases as the amount of displacement increases and the damping member 60 is compressed by the length L shown in fig. 6_cReturning to the hinge length L shown in fig. 7_oWhen the displacement is increased in the same direction, the damping member 60 will be further extended from the hinge length L_oStretching to a tensile elongationDegree L_d(not shown).

[ simulation analysis ]

The simulation analysis is a geometric non-linear vibration isolation system as shown in FIG. 2, at L_oAnd performing multi-degree-of-freedom structural seismic response analysis under the assumption that the length is 0.25 meter, the vibration isolator M is 5 metric tons, and the period of the vibration isolator 40 is 2 seconds, and taking a traditional horizontal vibration isolation system as a comparison group. Here, the analysis is designed with the aim of reducing the acceleration of the body to be isolated, using non-smooth H_∞synthesis is used as a control design method to obtain a design damping ratio. The difference between the conventional horizontal Vibration isolation system and the geometric non-linear Vibration isolation system is that the damping member of the conventional horizontal Vibration isolation system is connected to the plummer in a horizontal installation manner, the damping coefficient of the damping member is obtained by combining the design ni bi with a linear analysis manner, and the geometric non-linear Vibration isolation system obtains the damping coefficient by using a Random Vibration theory (Random Vibration) of equivalent linearity. In the simulation analysis, the geometric nonlinear vibration isolation system generates the acceleration and displacement reaction of the object to be isolated through nonlinear simulation, while the conventional horizontal vibration isolation system generates the acceleration and displacement reaction of the object to be isolated through linear simulation, and the results are shown in fig. 8 and 9.

The analysis result shows that the acceleration of the vibration isolator to be isolated in the geometric nonlinear vibration isolation system (indicated by "vertically installed damping member" in the figure, the damping coefficient is 1) is lower (as shown in fig. 8) and the generated displacement is further reduced (as shown in fig. 9) compared with the conventional horizontal vibration isolation system (indicated by "horizontally installed damping member" in the figure, the damping coefficient is 0.62833). Therefore, the geometric non-linear vibration isolation system has more advantages compared with the traditional horizontal vibration isolation system.

In summary, the geometric non-linear vibration isolation system of the present invention can be applied to vibration isolation of equipment (such as precision instruments or equipment), and a non-linear vibration isolation mechanism is generated by vertically or obliquely disposing the damping member, so as to effectively reduce the resonance characteristics of the vibration isolation system and avoid the over-amplification effect caused by resonance. Under the condition that the displacement of the medium and small earthquakes is small, the damping pieces which are arranged in an orthogonal or oblique mode can provide a relatively small damping ratio, the original efficiency of the vibration isolation system is effectively exerted, and the effect of the vibration isolation system is maximized. Under the condition of large earthquake displacement, the damping pieces arranged orthogonally or obliquely can provide a relatively large damping ratio, so that the displacement of the vibration isolation layer can be effectively controlled, and an effective energy dissipation mechanism is provided.

The above examples are only intended to illustrate embodiments of the present invention and to illustrate technical features of the present invention, and are not intended to limit the scope of the present invention. Any arrangement which can be easily changed or equalized by a person skilled in the art is included in the scope of the present invention, which is defined by the claims and the description.