CN211821278U

CN211821278U - Pipeline vibration damping support based on negative Poisson ratio structure

Info

Publication number: CN211821278U
Application number: CN202020071859.2U
Authority: CN
Inventors: 于涛; 阎旭; 王锡雄
Original assignee: Yantai University
Current assignee: Yantai University
Priority date: 2020-01-14
Filing date: 2020-01-14
Publication date: 2020-10-30
Anticipated expiration: 2030-01-14

Abstract

The utility model aims at solving the vibration problem of pipeline, relate to the pipeline equipment damping and fall the technical field of making an uproar, disclose a pipeline damping supports based on negative poisson's ratio structure. The utility model discloses a: fixed part, bumper shock absorber and upper and lower panel. The fixing part comprises a rubber ring and a U-shaped pipe clamp, and the U-shaped pipe clamp fixes the pipeline on the upper panel through a nut. The lower panel is fixed with a shock absorber with a negative Poisson ratio structure, a plurality of holes are formed in the shock absorber, and the holes are filled with polyurethane materials serving as fillers. When the pipeline vibrates, the negative Poisson ratio shock absorber filled with the polyurethane material can play a role in effectively slowing down the pipeline vibration due to the expansion deformation characteristic of the negative Poisson ratio structure and the excellent sound absorption and vibration elimination functions of the polyurethane material filled in the holes, the defect of common pipeline support is overcome, and the pipeline vibration is effectively inhibited. The device is characterized in that the novel negative Poisson's ratio structure and the polyurethane material filled in the holes of the novel negative Poisson's ratio structure are utilized to effectively inhibit the transmission of the vibration of the pipeline from top to bottom.

Description

Pipeline vibration damping support based on negative Poisson ratio structure

Technical Field

The utility model relates to a technical field that makes an uproar falls in the pipeline equipment damping, especially relates to a pipeline damping supports based on negative poisson's ratio structure.

Background

Pipeline transportation is widely applied to various industries, particularly large-scale ships and warships, and the problem of pipeline vibration and noise reduction on ships becomes a hot topic of current research because modern ships have higher and higher requirements on vibration and noise reduction. Because the liquid in the pipeline has pressure pulsation, vibration is easy to generate, and long-term vibration easily causes fatigue damage of the pipeline and liquid leakage, thereby not only polluting the environment, but also causing economic property loss. The common pipeline support adopted at present directly fixes and supports the pipeline by using channel steel, as shown in figure 1, and comprises a rubber ring 1, a U-shaped pipe clamp 2 and channel steel 3. The problem that this kind of ordinary pipeline supported exists is that energy dissipation effect is not good, and the shock attenuation effect is poor and the support is easily not hard up.

The utility model discloses the patent of the negative poisson ratio structure of shock absorber for other negative poisson ratio types among the device: the utility model provides a novel two arrow type burden poisson ratio structures and filled polyurethane damping material in its hole and made the damping performance that the pipeline supported promote greatly.

SUMMERY OF THE UTILITY MODEL

The utility model aims at having above-mentioned problem on the prior art, provide a pipeline damping supports based on negative poisson ratio structure.

The utility model discloses a realize through following technical scheme, a pipeline damping based on negative poisson ratio structure supports, include:

the fixed part comprises rubber circle and U-shaped pipe card, and rubber circle and U-shaped pipe card are responsible for being connected with the pipeline, make vibration can fully transmit on the bumper shock absorber and the rubber circle possesses certain damping function. The fixing part is fixed on the upper panel by bolts and is fixedly connected with the pipeline.

The shock absorber is positioned between the upper panel and the lower panel and is fixed with the upper panel and the lower panel through welding, the shock absorber is composed of a negative Poisson ratio structure and a polyurethane material, the negative Poisson ratio structure is provided with a plurality of holes, and the polyurethane material is filled in the holes as a filler.

And the upper basal plane is connected with the fixing part through a bolt, and the lower basal plane is connected with the damper through welding. The upper base surface of the lower panel is connected with the shock absorber through welding, and the lower base surface is fixed with the ship body through bolts.

The negative poisson's ratio structural cross-section includes but is not limited to the following two forms:

firstly, the cross section of the negative Poisson ratio structure is concave honeycomb-shaped, and the concave honeycomb is the hole.

And secondly, the cross section of the negative Poisson ratio structure is in a double-arrow shape, and double-arrow holes are the holes.

Compared with the prior art, the utility model discloses following effect has:

the vibration absorber of the pipeline vibration-damping support adopts a negative Poisson ratio structure, and polyurethane materials are filled in the holes, so that the polyurethane materials in the holes are fully utilized by utilizing the characteristic of tensile expansion and compression deformation of the negative Poisson ratio structure, the dissipation effect of vibration energy is obviously increased by utilizing the characteristics of the negative Poisson ratio structure and the excellent sound-absorbing and vibration-isolating properties of the polyurethane materials, the defects of poor energy dissipation effect and poor vibration-damping effect of the common pipeline support are overcome, and the vibration-damping effect of the pipeline support is obviously optimized.

As shown in fig. 8, the present invention is compared with the displacement response of the conventional pipe support under 10-1500HZ frequency sweep by finite element software simulation. It can be clearly seen from fig. 8 that under the same excitation, the displacement of the pipeline vibration damping support with the negative poisson's ratio structure in the frequency band of 10 to 1500HZ is far smaller than that of the common pipeline support, which proves that the pipeline vibration damping support with the negative poisson's ratio structure has good vibration damping effect. Especially, the damping effect is obvious under the resonance frequency.

Drawings

FIG. 1 is a schematic view of a prior art common pipeline support structure

Fig. 2 a schematic perspective view of a vibration-damping support structure for a pipeline provided in example 1 of the present invention

Fig. 3 a schematic perspective view of a vibration-damping support structure for a pipeline provided in example 2 of the present invention

Figure 4 schematic perspective view of damper of pipeline damping support structure provided in example 1 of the present invention

Fig. 5 a schematic front view of a damper of a pipe damping support structure according to example 1 of the present invention

Fig. 6 a schematic perspective view of a damper of a pipe damping support structure provided in example 2 of the present invention

Figure 7 schematic front view of damper of pipeline damping support structure provided in example 2 of the present invention

FIG. 8 is a graph showing the comparison of the displacement response of the finite element software simulation under 10-1500HZ frequency sweep for supporting the common pipeline

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be noted that the specific examples described herein are only for explaining the present invention, and are not intended to limit the present invention.

We use the poisson's ratio concept to describe the relationship between transverse and longitudinal deformation of a material in the presence of an external force. Most conventional materials have a positive poisson's ratio, but when the poisson's ratio of the structure is negative, the structure exhibits properties different from those of the conventional materials. The negative poisson's ratio structure has the characteristic of auxetic expansion, namely, when the material is subjected to longitudinal tensile deformation, the structure expands in the transverse direction.

As can be seen from FIG. 3, the pipe vibration reduction support with the negative Poisson's ratio structure mainly comprises a fixing part, a vibration reducer and an upper panel and a lower panel. The fixing part is composed of a U-shaped pipe clamp 1 and a rubber ring 2, and the pipeline is fixed on the pipeline vibration damping support through the fixing part. Wherein the vibration damper is a core component of the pipeline vibration damping support. The vibration damper is composed of a negative Poisson ratio structure 5 and a polyurethane material 4 filled in the negative Poisson ratio structure. The auxetic effect of the negative Poisson ratio structure and the excellent sound absorption and vibration isolation performance of the polyurethane material provide guarantee for the vibration reduction performance of the vibration absorber. The upper panel 3 is connected with the shock absorber by welding through the bolt chain fixing part. The lower panel 6 is fixed with the bottom plate of the ship through bolts, and the upper surface of the lower panel is connected with the shock absorber through welding.

The negative poisson's ratio structure vibration damper is not limited to the two forms shown in fig. 4, 5, 6 and 7. Different negative poisson ratio structures can form different holes, and polyurethane materials are filled in the holes.

Fig. 4 and 5 are a three-dimensional diagram and a two-dimensional diagram of the concave honeycomb negative poisson's ratio structure vibration damper of the example 1. The honeycomb structure is composed of an upper panel 1, polyurethane material fillers 3, an inwards concave honeycomb structure 2 and a lower panel 4. FIG. 2 shows the position of the concave honeycomb negative Poisson ratio structure damper in the pipeline damping support of the negative Poisson ratio structure.

Fig. 6 and 7 are three-dimensional and two-dimensional diagrams of the double-arrow negative poisson's ratio structure damper of the example 2. The double-arrow negative Poisson's ratio structure is composed of an upper panel 1, a polyurethane material filler 2, a double-arrow negative Poisson's ratio structure 3 and a lower panel 4. FIG. 3 is a position of a double-arrow negative Poisson ratio structure damper in a pipeline damping support of a negative Poisson ratio structure.

The U-shaped pipe clamp and the negative Poisson ratio structure damper can be made of cast iron, copper alloy, aluminum alloy and other metals with good damping effect, and the materials of the upper panel and the lower panel are not limited to metal materials. The negative poisson's ratio structure damper can be made by casting technology.

Finally, it should be particularly noted that although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pipeline vibration damping support based on a negative Poisson ratio structure is characterized by comprising:

the fixing part is fixedly connected with the pipeline;

the upper end surface of the upper panel is connected with the fixing part through a nut;

the shock absorber is positioned between the upper panel and the lower panel, the upper end face of the shock absorber is connected with the upper panel in a welding mode, the lower end face of the shock absorber is connected with the lower panel in a welding mode, the shock absorber is composed of a negative Poisson ratio structure, a plurality of holes are formed in the cross section of the negative Poisson ratio structure, and the polyurethane material is filled in the holes as a filler;

and the upper end surface of the lower panel is connected with the vibration absorber through welding.

2. The negative poisson's ratio structure-based pipe damping support of claim 1, wherein the negative poisson's ratio structure of the damper is an inwardly concave honeycomb shape, and the inwardly concave honeycomb shape is the hole.

3. The negative poisson's ratio structure-based pipe damping support of claim 1, wherein the negative poisson's ratio structure of the damper is double arrow-shaped, and the double arrow is the hole.

4. The negative poisson's ratio structure-based pipe damping support of claim 1, wherein the negative poisson's ratio structure material of the damper is three metal materials of cast iron, copper alloy and aluminum alloy.

5. The negative poisson's ratio structure-based pipe damping support of claim 1, wherein the negative poisson's ratio structure of the damper is obtained by integral casting.