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Cycle beam for vibration suppression

A technology for suppressing vibration and straight beams, applied in the direction of joists, girders, truss beams, etc., can solve the problems of increasing difficulty and effect, vibration excitation powerlessness, etc., achieve good general vibration reduction effect, easy to implement, and simple structure

Active Publication Date: 2018-11-20
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the three types of vibration are not related to each other, different types of vibration need to implement different suppression methods, which undoubtedly increases the difficulty and effect of implementation.
Although the current wave beam can suppress the bending vibration and longitudinal vibration in the bandgap frequency range in the axial plane, it is still powerless to suppress the vibration excitation in any direction in space at the same time.

Method used

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  • Cycle beam for vibration suppression
  • Cycle beam for vibration suppression
  • Cycle beam for vibration suppression

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment discloses a periodic beam that suppresses vibration, such as figure 1 As shown, the periodic beam is in a spiral shape along a spatial axis, and is composed of 6 spatial four-fold line beam units connected, that is, the period number of the periodic beam is 6; the four-line beam unit is composed of four straight beams with the same length Three connection points are connected end to end to form an open space four-fold line beam, and the open space four-fold line beam is projected as a square on a certain plane.

[0041] Such as figure 2 As shown, the periodic beam takes a four-line beam unit as a period; as image 3 As shown, extending along the z-axis direction;

[0042] Such as Figure 4As shown, a four-fold line beam unit structure in this embodiment is projected as a square on a certain plane. The length of the diagonal of the square is the maximum length of the helical structure of the periodic beam in the direction perpendicular to the helical...

Embodiment 2

[0048] This embodiment discloses a vibration-suppressing periodic beam. Compared with Embodiment 1, the difference lies in that the periodic beam is composed of 15 spatial four-fold line beam units connected, that is, the periodic number of the periodic beam is 15.

[0049] A four-fold line beam unit structure in this embodiment is projected as a square on a certain plane. The length of the diagonal of the square is the maximum length of the helical structure of the periodic beam in the direction perpendicular to the helical axis, denoted as 2r; 0.0005m; 2r / a can be 100;

[0050] The beam section shape of the periodic beam is circular, and the circular diameter is 0.0001m;

[0051] The four-line beam unit is connected by straight beam bolts, and the periodic beam is welded by the four-line beam unit;

[0052] The four-fold line beam unit adopts a density of 1180kg·m -3 , the modulus of elasticity is 0.435×10 10 Pa, epoxy resin with Poisson's ratio of 0.368.

[0053] Takin...

Embodiment 3

[0055] This embodiment discloses a vibration-suppressing periodic beam. Compared with Embodiment 1, the difference lies in that the periodic beam is composed of 30 space four-fold line beam units connected, that is, the periodic number of the periodic beam is 30.

[0056] A four-fold line beam unit structure in this embodiment is projected as a square on a certain plane. The length of the diagonal of the square is the maximum length of the helical structure of the periodic beam in the direction perpendicular to the helical axis, denoted as 2r; 8m; 2r / a can be 0.001;

[0057] The beam section shape of the periodic beam is annular, the outer diameter of the annular is 0.05m, and the inner diameter is 0.01m;

[0058] The four-fold line beam unit is integrally formed, and the periodic beam is integrally formed;

[0059] The four-fold line beam unit adopts a density of 7800kg·m -3 , the modulus of elasticity is 21.0×10 10 Pa, steel with Poisson's ratio of 0.3.

[0060] Taking ...

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Abstract

The invention discloses a cycle beam for vibration suppression. The cycle beam is spirally shaped along a space axis and formed by connecting a plurality of space four-folded beam elements, each four-folded beam element comprises four straight beams of the same length, which are connected around three junction points end to end for forming an open space four-folded beam, and the projection of theopen space four-folded beam on a plane is square. Through the special built-up connection among the straight beams, the structure is enabled to stop vibrational excitation produced at one end within acertain frequency range in any direction from transmitting to the other end of the structure, thereby realizing the joint control and the elimination of any vibration within a certain frequency rangein the overall extension direction of the cycle beam.

Description

technical field [0001] The invention belongs to the technical field of vibration control, in particular to a periodic beam for suppressing vibration. Background technique [0002] Vibration is very harmful to building structures, mechanical equipment, etc., and will reduce the performance of components, shorten their life, and cause damage. How to effectively control and eliminate harmful vibrations is an important issue that people have been exploring. To eliminate or reduce vibration, it is generally possible to control and reduce the energy output and frequency range of the vibration source, such as vibration isolation technology, or change and reduce the transmission path of vibration, such as vibration reduction technology, or change the dynamic characteristics of the vibrating object . Traditional vibration reduction and vibration isolation technologies mostly rely on damping to dissipate vibration energy, which can cover a wide range of vibration frequencies, but ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C3/28E04B1/98E04H9/02
CPCE04C3/28E04H9/021
Inventor 韩林
Owner HOHAI UNIV
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