阅读说明：本技术 一种宽频段减振降噪超材料多跨梁结构 (Wide-frequency-band vibration-damping noise-reducing metamaterial multi-span beam structure ) 是由 郝帅民 李凤明 吴志静 于 2019-09-24 设计创作，主要内容包括：一种宽频段减振降噪超材料多跨梁结构,本发明属于工程减振降噪技术领域,主要为了解决现有技术中的多跨梁结构无法拓宽带隙频率范围,在多个频率范围内衰减结构振动幅度的问题,本发明主要包括底板、固定支撑组件、长梁、M个支撑组件和M+2个振子,M为正整数；固定支撑组件设置在底板上表面的一端,M个支撑组件沿底板的长度方向等距设置在底板的上表面上,M+2个振子沿长梁的长度方向等距设置在长梁的下表面上,且每个振子与长梁的下表面固定连接,长梁设置在固定支撑组件和M个支撑组件上,且长梁与固定支撑组件和每个支撑组件粘接固定,每个振子与一个支撑组件交错设置,本发明用于工程建造中的承重装置。(The invention discloses a wide-band vibration-damping noise-reducing metamaterial multi-span beam structure, belongs to the technical field of engineering vibration-damping noise reduction, and mainly aims to solve the problems that a multi-span beam structure in the prior art cannot widen a band gap frequency range and attenuate the vibration amplitude of the structure in multiple frequency ranges; the fixed supporting components are arranged at one end of the upper surface of the bottom plate, M supporting components are arranged on the upper surface of the bottom plate at equal intervals along the length direction of the bottom plate, M +2 vibrators are arranged on the lower surface of the long beam at equal intervals along the length direction of the long beam, each vibrator is fixedly connected with the lower surface of the long beam, the long beam is arranged on the fixed supporting components and the M supporting components, the long beam is fixedly bonded with the fixed supporting components and each supporting component, and each vibrator and one supporting component are arranged in a staggered mode.)

1. The utility model provides a many bridge structures of wide band section damping noise reduction metamaterial which characterized in that: the wide-frequency-band vibration-damping noise-reducing metamaterial multi-span beam structure comprises a bottom plate (1), a fixed supporting assembly, a long beam (7), M flexible supporting assemblies and M +2 vibrators, wherein M is a positive integer; bottom plate (1) is the cuboid, fixed supporting component sets up the one end at bottom plate (1) upper surface, M flexible supporting component sets up on the upper surface of bottom plate (1) along the length direction equidistance of bottom plate (1), and fixed supporting component and every flexible supporting component all with bottom plate (1) fixed connection, M +2 oscillators set up on the lower surface of long roof beam (7) along the length direction equidistance of long roof beam (7), and the lower fixed surface of every oscillator and long roof beam (7) is connected, long roof beam (7) set up on fixed supporting component and M flexible supporting component, and long roof beam (7) and fixed supporting component and every flexible supporting component bond fixedly, every supporting component sets up between two adjacent oscillators.

2. The wide-band vibration-damping and noise-reducing metamaterial multi-span beam structure as claimed in claim 1, wherein: fixed supporting component is including support cylinder A (9), smooth ring A (10) and two round hole supporting steel plate (2), two round hole supporting steel plate (2) set up relatively, the lateral wall upper portion of every round hole supporting steel plate (2) is equipped with a through-hole, the both ends of support cylinder A (9) set up respectively in a through-hole, and each end and a through-hole interference fit of support cylinder A, smooth ring A (10) cover is established at the middle part of support cylinder A (9) outer disc, and smooth ring A (10) rotate with support cylinder A (9) and be connected, the lower surface of long beam (7) bonds on smooth ring A (10), the bottom surface rigid coupling of every round hole supporting steel plate (2) is at the upper surface of bottom plate (1), the axis of support cylinder A (9) and the broadside parallel arrangement of bottom plate (1) upper surface.

3. The wide-band vibration-damping and noise-reducing metamaterial multi-span beam structure as claimed in claim 1, wherein: the flexible supporting component comprises a supporting cylinder B (4), a smooth circular ring B (8) and two long hole supporting steel plates (3), the two long hole supporting steel plates (3) are oppositely arranged, the upper part of the side wall of each long hole supporting steel plate (3) is provided with a horizontal strip-shaped hole, the two ends of the supporting cylinder B (4) are respectively arranged in the horizontal strip-shaped holes, each end of the supporting cylinder B (4) is connected with a horizontal bar-shaped hole in a sliding way, the smooth circular ring B (8) is sleeved in the middle of the outer circular surface of the supporting cylinder B (4), and smooth ring B (8) rotate with support cylinder B (4) and be connected, the lower surface of long roof beam (7) bonds on smooth ring B (8), the bottom surface rigid coupling of every slot hole supporting steel plate (3) is at the upper surface of bottom plate (1), the axis of slot hole supporting steel plate (3) and the broadside parallel arrangement of bottom plate (1) upper surface.

4. The wide-band vibration-damping and noise-reducing metamaterial multi-span beam structure as claimed in claim 3, wherein: the length of the horizontal strip-shaped hole in the upper part of the side wall of the long hole supporting steel plate (3) is L, and the value range of L is 8-12 mm.

5. The wide-band vibration-damping and noise-reducing metamaterial multi-span beam structure as claimed in claim 1, wherein: the oscillator comprises cylindrical rubber (5) and a cylindrical steel block (6), one end of the cylindrical rubber (5) is fixedly connected with one end of the cylindrical steel block (6), and the other end of the cylindrical rubber (5) is fixedly connected with the lower surface of the long beam (7).

6. The wide-band vibration-damping and noise-reducing metamaterial multi-span beam structure as claimed in claim 4, wherein: the end surface diameter of the cylindrical rubber (5) is smaller than that of the cylindrical steel block (6).

7. The wide-band vibration-damping and noise-reducing metamaterial multi-span beam structure as claimed in claim 1, wherein: the number M of the flexible supporting components ranges from 2 to 4.

8. The wide-band vibration-damping and noise-reducing metamaterial multi-span beam structure as claimed in claim 1, wherein: the distance between the fixed supporting component and the adjacent flexible supporting component is L1, and the value range of L1 is 18-24 cm.

9. The wide-band vibration-damping and noise-reducing metamaterial multi-span beam structure as claimed in claim 1, wherein: the distance between two adjacent flexible supporting components is L2, and the value range of L2 is 18-24 cm.

10. The wide-band vibration-damping and noise-reducing metamaterial multi-span beam structure as claimed in claim 1, wherein: the distance between two adjacent vibrators is L3, and the value range of L3 is 18-24 cm.

Technical Field

The invention belongs to the technical field of engineering vibration reduction and noise reduction, and particularly relates to a wide-frequency-band vibration reduction and noise reduction metamaterial multi-span beam structure.

Background

The vibration problem of the beam structure in engineering application cannot be ignored, the service life of the beam structure in engineering application is seriously influenced, and with the continuous development of science and technology, people continuously overcome the vibration problem, by periodically laying vibrators on the beam, when the vibrator and the beam resonate, the propagation of elastic waves in the beam structure can be attenuated, thereby achieving the effect of vibration reduction, due to the complex factors in modern engineering application, the vibration frequency range is also continuously widened, which requires that the beam structure in the engineering application can realize the vibration damping effect in a plurality of frequency sections, therefore, the vibration damping effect can not be realized only by the mode that the vibrator absorbs the vibration amplitude, but the band gap frequency range of the beam structure is increased in the existing structure, and effectively attenuates vibration in a multi-frequency range, so that the wide-frequency-band vibration-damping noise-reducing metamaterial multi-span beam structure is very in practical significance.

Disclosure of Invention

The invention provides a wide-frequency-band vibration-damping noise-reducing metamaterial multi-span beam structure, aiming at solving the problems that the band gap frequency range cannot be widened and the structural vibration amplitude cannot be attenuated in multiple frequency ranges by the multi-span beam structure in the prior art.

A wide-frequency-band vibration-damping noise-reducing metamaterial multi-span beam structure comprises a bottom plate, fixed supporting components, a long beam, M flexible supporting components and M +2 vibrators, wherein M is a positive integer; the bottom plate is a cuboid, the fixed supporting assembly is arranged at one end of the upper surface of the bottom plate, the M flexible supporting assemblies are equidistantly arranged on the upper surface of the bottom plate along the length direction of the bottom plate, the fixed supporting assembly and each flexible supporting assembly are fixedly connected with the bottom plate, the M +2 vibrators are equidistantly arranged on the lower surface of the long beam along the length direction of the long beam, each vibrator is fixedly connected with the lower surface of the long beam, the long beam is arranged on the fixed supporting assembly and the M flexible supporting assemblies, the long beam is fixedly bonded with the fixed supporting assembly and each flexible supporting assembly, and each supporting assembly is arranged between two adjacent vibrators;

furthermore, the fixed supporting assembly comprises a supporting cylinder A, a smooth circular ring A and two circular hole supporting steel plates, the two circular hole supporting steel plates are arranged oppositely, a through hole is formed in the upper portion of the side wall of each circular hole supporting steel plate, two ends of the supporting cylinder A are arranged in the through holes respectively, each end of the supporting cylinder A is in interference fit with one through hole, the smooth circular ring A is sleeved in the middle of the outer circular surface of the supporting cylinder A and is rotatably connected with the supporting cylinder A, the bottom surface of each circular hole supporting steel plate is fixedly connected to the upper surface of the bottom plate, and the axis of the supporting cylinder A is parallel to the wide edge of the upper surface of the bottom plate;

furthermore, the flexible supporting assembly comprises a supporting cylinder B, a smooth circular ring B and two long hole supporting steel plates, wherein the two long hole supporting steel plates are arranged oppositely, a horizontal strip-shaped hole is formed in the upper portion of the side wall of each long hole supporting steel plate, two ends of each supporting cylinder B are arranged in the horizontal strip-shaped holes respectively, each end of each supporting cylinder B is connected with one horizontal strip-shaped hole in a sliding mode, the smooth circular ring B is sleeved in the middle of the outer circular surface of each supporting cylinder B and is connected with the supporting cylinder B in a rotating mode, the bottom surface of each long hole supporting steel plate is fixedly connected to the upper surface of the bottom plate, and the axis of each long hole supporting steel plate is parallel to the wide edge of the upper surface of the;

furthermore, the length of a horizontal strip-shaped hole in the upper part of the side wall of the long hole supporting steel plate is L, and the value range of L is 8-12 mm;

further, the vibrator comprises a cylindrical rubber and a cylindrical steel block, one end of the cylindrical rubber is fixedly connected with one end of the cylindrical steel block, and the other end of the cylindrical rubber is fixedly connected with the lower surface of the long beam;

further, the diameter of the end face of the cylindrical rubber is smaller than that of the end face of the cylindrical steel block;

furthermore, the number M of the flexible supporting components ranges from 2 to 4;

further, the distance between the fixed support assembly and the adjacent flexible support assembly is L1, and the value range of L1 is 18-24 cm;

further, the distance between two adjacent flexible supporting components is L2, and the value range of L2 is 18-24 cm;

further, the distance between two adjacent vibrators is L3, and the value range of L3 is 18-24 cm.

Compared with the prior art, the invention has the following beneficial effects:

1. compared with the beam structure provided by the prior art, the invention ensures that the long beam can generate micro deformation at the supporting point of the round hole supporting steel sheet and can slide at the supporting point of the long hole supporting steel sheet, thereby realizing the periodic simple supporting boundary condition of the metamaterial multi-span beam.

2. Compared with the beam structure provided by the prior art, the invention has the advantages that the vibrator is added on the long beam, so that the vibration of the long beam can be attenuated in a certain frequency range.

3. Compared with the beam structure provided by the prior art, the beam structure provided by the invention has the advantages that the long beam is applied with periodic boundary conditions, and the vibration of the long beam can be attenuated at medium-high frequency.

4. Compared with the beam structure provided by the prior art, the invention can couple the local resonance band gap and the Bragg band gap, broaden the band gap frequency range and improve the vibration and noise reduction effect.

5. The invention has simple structure, convenient manufacture and low cost, and saves the expenses for scientific research.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is a top view of the present invention;

FIG. 4 is an isometric view of the present invention;

FIG. 5 is a graph of vibration frequency and displacement during an experiment of the present invention;

fig. 6 is a graph of vibration frequency and displacement of a general beam.

In the figure, a bottom plate 1, a circular hole supporting steel plate 2, a long hole supporting steel plate 3, a supporting cylinder B4, a cylindrical rubber 5, a cylindrical steel block 6, a long beam 7, a smooth circular ring B8, a supporting cylinder A9 and a smooth circular ring A10 are arranged.

Detailed Description