CN217207469U

CN217207469U - Vibration isolation metamaterial device based on equivalent mass amplification

Info

Publication number: CN217207469U
Application number: CN202220827155.2U
Authority: CN
Inventors: 袁柯柯; 杜秋姣; 郭乃泉
Original assignee: China University of Geosciences
Current assignee: China University of Geosciences
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2022-08-16
Anticipated expiration: 2032-04-11

Abstract

The utility model discloses a vibration isolation metamaterial device based on equivalent mass is enlarged, include: the shock insulation assembly structure comprises a plurality of mass columns, a plurality of wave reduction devices and a cross-shaped mass frame, wherein the wave reduction devices are welded and fixed to the tops of the mass columns, and the tail end parts of the cross-shaped mass frame are welded and fixed to the tops of the wave reduction devices. The utility model discloses based on equivalent mass enlargies the principle, design shock insulation assembly structure obtains the forbidden band of lower frequency to satisfy the requirement in seismic wave field, make the rayleigh wave in the band gap all can't see through this protective screen. The utility model discloses a shock insulation assembly structure attenuates to the Rayleigh wave of certain wave band, can effectively protect all regional buildings behind the protective screen.

Description

Vibration isolation metamaterial device based on equivalent mass amplification

Technical Field

The utility model relates to a shock insulation technical field. More specifically, the utility model relates to a vibration isolation metamaterial device in equivalent mass enlargies.

Background

The earliest measures for building earthquake protection were to design the structure of the building to withstand earthquake, the principle of operation of which was to store and consume earthquake energy using the non-linear state of the individual structures themselves. The general method is to enlarge the cross section of the building structure, increase the reinforcing bars, ensure the structure to have enough strength, rigidity and ductility, and further enhance the seismic performance of the main body structure to resist the earthquake action. However, the method has some disadvantages, such as generally poor durability, short service life, and need to be used carefully in corrosive and other severe environments, wherein the anti-vibration support is expensive, and the cost is limited when the vibration-isolation support is laid in a large area; in addition, the reinforcement and earthquake resistance of the building are limited in engineering, and the building cannot resist sudden high-strength great earthquakes; in addition, it is difficult to protect an already-built building, such as an ancient site, by adopting the vibration-resistant method.

Based on the continuous exploration of the physics theory, the regulation and control of the waves are developed from electromagnetic waves to mechanical waves, particularly the rapid development in the field of metamaterials, and the breakthrough of the correlation theory of controlling large wavelength in a small size provides possibility for the regulation and control of seismic waves. Researchers are gradually turning to metamaterial regulated seismic surface waves from traditional seismic design to achieve seismic isolation. At present, three types of seismic isolation modes are mainly designed based on metamaterials, one type is a Bragg scattering type seismic metamaterial, and the design requires that the size of a seismic isolation structure is equivalent to the wavelength of seismic waves, so that the seismic waves are difficult to regulate and control under the theory. The second is a local resonance type seismic metamaterial, and theoretically, the large wavelength regulation and control of a small-size seismic isolation structure are realized. But only an extremely narrow frequency band can be regulated, so that the vibration isolation is difficult to play. The third is seismic wave metamaterial under an equivalent mass amplification mechanism, and a wider frequency band can be obtained under the equivalent mass amplification mechanism. However, the existing seismic isolation structure adopting an equivalent amplification mechanism is inconvenient to mount and transport and has a complex structure.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to solve at least the above problems and to provide at least the advantages which will be described later.

The utility model discloses still another purpose provides a vibration isolation metamaterial device based on equivalent mass is enlarged, including a plurality of shock insulation assembly structure, shock insulation assembly structure includes a plurality of quality posts, a plurality of ripples device and the cross quality frame of subtracting. The utility model discloses mainly utilize equivalent mass to enlarge the regulation and control principle to the earthquake wave, designed the shock insulation assembly structure of effective shock insulation of ability. The shock insulation assembly structure is made of steel materials common in life, is simple in design, low in requirement on manufacturing process, suitable in size and convenient to transport and install, is formed by combining simple geometric structures, does not have the requirement on periodic arrangement of the structure, is extremely low in requirement on construction precision, and has application value.

In order to achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a vibration isolation metamaterial device based on equivalent mass amplification, including: the shock insulation assembly structure comprises a plurality of mass columns, a plurality of wave reduction devices and a cross-shaped mass frame, wherein the wave reduction devices are welded and fixed to the tops of the mass columns, and the tail end parts of the cross-shaped mass frame are welded and fixed to the tops of the wave reduction devices.

Preferably, the seismic isolation mounting structure further comprises: the fixing seats are welded at the bottoms of the mass columns, and the horizontal projection of the mass columns is located in the fixing seats.

Preferably, the wave reduction device includes rotation portion and fixed part, rotation portion includes the balancing weight and the protruding dwang of establishing the balancing weight upper end, the dwang rotates to be connected in the fixed part.

Preferably, the vertical projection of the counterweight block is in a semi-elliptical structure.

Preferably, the fixed part includes a pair of support column and spacing portion, spacing portion welding is in the upper end of a pair of support column, and one side in opposite directions of a pair of support column is provided with the side groove, the side inslot is fixed with the bearing, the dwang with the side inslot the bearing is connected.

Preferably, the upper end part of the balancing weight is arc-shaped, and the radian of the bottom of the limiting part is greater than that of the upper end part of the balancing weight.

The utility model discloses at least, include following beneficial effect:

the shock insulation assembly structure obtains a lower-frequency forbidden band based on an equivalent mass amplification principle, and realizes a low-frequency band gap effect which cannot be achieved by the traditional shock insulation material so as to meet the application requirements of the seismic metamaterial. Compared with the traditional engineering earthquake resistance, the structure can attenuate Rayleigh waves in a band gap range, and can effectively protect buildings in all areas behind a barrier.

The shock insulation assembly structure is made of steel materials common in life, is simple in design, low in requirement on manufacturing process, suitable in size and convenient to transport and mount, is integrally formed by combining simple geometric structures, does not have periodic arrangement requirement on the structure, is extremely low in requirement on construction precision and has application value.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic structural view of the vibration isolation metamaterial device of the present invention;

FIG. 2 is a schematic structural view of the seismic isolation assembly structure of the present invention;

FIG. 3 is a schematic structural view of the wave-damping device of the present invention;

fig. 4 is an exploded schematic view of the wave-damping device of the present invention;

FIG. 5 is a schematic structural view of the fixing base of the present invention;

FIG. 6 is a schematic structural view of the support post of the present invention;

fig. 7 is the utility model discloses shock insulation assembly structure's assembly structure sketch map.

Reference numerals: shock insulation assembly structure 1, mass column 2, wave reduction device 3, rotating part 31, balancing weight 311, rotating rod 312, fixing part 32, support column 321, limiting part 322, cross-shaped mass frame 4, fixing seat 5, side groove 6, bearing 7, screw 8, screw hole 9 and groove 10

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

It should be noted that, in the description of the present invention, the terms "top", "bottom", "inner", "outer", "upper end", "side facing" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of description of the present invention and simplification of description, and do not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1, the utility model provides a vibration isolation metamaterial device based on equivalent mass is enlarged, this antidetonation model device is formed by metamaterial preparation, include: a plurality of shock insulation assembly structures 1, as shown in figure 2, shock insulation assembly structure 1 includes a plurality of quality posts 2, a plurality of subtracts ripples device 3 and cross quality frame 4, subtract ripples device 3 welded fastening in quality post 2 top, cross quality frame 4 terminal portion welded fastening in a plurality of subtract ripples device 3 tops. The four mass columns 2 are arranged in a cross shape, the wave reduction device 3 is welded at the top of each mass column 2, the wave reduction device 3 is also in a cross structure, and the lower surface of the tail end of the cross mass frame 4 is welded on the wave reduction device 3. For the installation of making things convenient for shock insulation assembly structure 1, shock insulation assembly structure 1 still includes: a plurality of fixing seats 5, as shown in fig. 5, the fixing seats 5 are welded at the bottom of the mass column 2, the horizontal projection of the mass column 2 is located in the fixing seats 5, the projection area of the fixing seats 5 is larger than that of the mass column 2, so that the vibration isolation assembly structure 1 can be conveniently fixed in a mounting area by using large-size screws 8 in screw holes 9 around the fixing seats 5.

As shown in fig. 3 and 4, the wave-reducing device 3 includes a rotating portion 31 and a fixing portion 32, the rotating portion 31 includes a weight block 311 and a rotating rod 312 protruding from an upper end of the weight block 311, and the rotating rod 312 is rotatably connected in the fixing portion 32. The rayleigh waves (surface waves) caused by the earthquake cause the weight 311 to rotate relative to the fixed portion 32. The counterweight 311 is in a semi-elliptical structure relative to the vertical projection of the fixing portion 32, so that the counterweight can rotate relative to the fixing portion 32.

Fixed part 32 includes a pair of support column 321 and spacing portion 322, spacing portion 322 welds the upper end at a pair of support column 321, and one side that a pair of support column 321 is in opposite directions is provided with side channel 6, as shown in fig. 6, side channel 6 internal fixation has bearing 7, dwang 312 with in the side channel 6 bearing 7 connects, and the rotation of balancing weight 311 leans on the rotation of bearing 7 to realize. The upper end of the balancing weight 311 is arc-shaped, and the radian of the bottom of the limiting part 322 is greater than that of the upper end of the balancing weight 311, so that the balancing weight 311 rotates relative to the limiting part 322.

In the process of seismic wave propagation, the seismic wave mainly poses a great threat to buildings in a surface wave mode, and after the seismic surface wave propagates to an area where a plurality of seismic isolation assembly structures form a barrier, partial frequency surface waves are reflected or rotated in a wave mode so as to realize suppression of surface wave propagation. The embodiment provides a vibration isolation metamaterial device using method based on equivalent mass amplification, for convenient transportation, the mass column 2, a plurality of wave reduction devices 3 and a cross-shaped mass frame 4 in the vibration isolation assembly structure 1 are all placed as independent parts, after transportation to a destination, the vibration isolation assembly structure 1 is placed in an open area, a rectangular area is selected on the surface of the open area, a square groove 10 is excavated, then a fixing seat 5 is fixed in the square groove 10 through a large-size screw 8, then the mass column 2 is welded on a base in a welding mode, and assembly below the wave reduction devices 3 is completed, as shown in fig. 7. Then, a wave-reducing device 3 is fixed above each mass column 2, the overall structure of the wave-reducing device 3 is shown in fig. 3, the wave-reducing device 3 includes a rotating portion 31, a pair of support columns 321 and a limiting portion 322, the limiting portion 322 is welded to the pair of support columns 321, the rotating portion 31 is rotatably connected to the pair of support columns 321, and the pair of support columns 321 is welded to the mass columns 2. Spacing portion 322 welds in the upper end of a pair of support column 321, and the opposite one side of a pair of support column 321 is provided with side channel 6, side channel 6 internal fixation has bearing 7, dwang 312 with in the side channel 6 bearing 7 is connected.

When an earthquake reaches the surface, a part of energy is reflected and propagates to the underground in the form of bulk waves, and the rest energy propagates to the surface in the form of rayleigh waves (surface waves). Research has shown that Rayleigh waves caused by earthquakes are the main contributor to building damage, and the frequency of these seismic waves is mostly below 20 Hz. When Rayleigh waves in the band gap range reach the shock insulation assembly structure group 1, the shock insulation assembly structures form a barrier, and the Rayleigh waves are scattered to be transmitted towards the underground and cannot be continuously transmitted along the earth surface, so that the effect of resisting earthquakes is achieved.

The utility model discloses based on equivalent mass enlargies the principle, obtain the forbidden band of lower frequency to satisfy the requirement in seismic wave field, make the seismic wave in the band gap all can't see through this protective screen. Compared with the traditional engineering earthquake resistance, the device attenuates earthquake waves with a certain wave band, and can effectively protect buildings in all areas behind the barrier. Compared with other anti-seismic metamaterials, the shock insulation structure has the advantages of ingenious design, excellent shock insulation effect and lower installation and maintenance cost. By adopting the mode of hollowing out the middle part, the lower frequency seismic band gap is achieved, and the material cost is saved.

While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.

Claims

1. A vibration isolation metamaterial device based on equivalent mass amplification is characterized by comprising: the shock insulation assembly structure comprises a plurality of mass columns, a plurality of wave reduction devices and a cross-shaped mass frame, wherein the wave reduction devices are welded and fixed to the tops of the mass columns, and the tail end parts of the cross-shaped mass frame are welded and fixed to the tops of the wave reduction devices.

2. The vibration isolation metamaterial device based on equivalent mass amplification of claim 1, wherein the vibration isolation mounting structure further comprises: the fixing seats are welded at the bottoms of the mass columns, and the horizontal projection of the mass columns is located in the fixing seats.

3. The vibration isolation metamaterial device based on equivalent mass amplification of claim 1, wherein the wave reduction device comprises a rotating portion and a fixing portion, the rotating portion comprises a balancing weight and a rotating rod convexly arranged at the upper end of the balancing weight, and the rotating rod is rotatably connected in the fixing portion.

4. The vibration isolation metamaterial device based on equivalent mass amplification of claim 3, wherein the vertical projection of the weight block is in a semi-elliptical structure.

5. The vibration isolation metamaterial device based on equivalent mass amplification of claim 3, wherein the fixing portion comprises a pair of support pillars and a limiting portion, the limiting portion is welded at the upper end portions of the pair of support pillars, side grooves are formed in the opposite sides of the pair of support pillars, bearings are fixed in the side grooves, and the rotating rod is connected with the bearings in the side grooves.

6. The vibration isolation metamaterial device based on equivalent mass amplification of claim 5, wherein the upper end of the weight block is arc-shaped, and the radian of the bottom of the limiting portion is greater than that of the upper end of the weight block.