A Periodic Piezoelectric Beam Structure with Active Vibration and Noise Reduction Functions

An active vibration reduction, vibration reduction and noise reduction technology, applied to truss structures, joists, girders, etc., can solve the problems of inability to actively control the vibration band gap frequency range of beam structures, poor vibration and noise reduction effects, etc., to achieve good Effects of vibration reduction and noise reduction, increased bandgap range, and easy operation

Active Publication Date: 2021-11-30
HARBIN ENG UNIV
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the beam structure in the prior art cannot actively control the vibration bandgap frequency range of the beam structure, so that the vibration and noise reduction effect of the engineering structure is poor under a wide excitation frequency, the invention further provides an active Periodic piezoelectric beam structure with vibration and noise reduction functions;

Method used

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  • A Periodic Piezoelectric Beam Structure with Active Vibration and Noise Reduction Functions
  • A Periodic Piezoelectric Beam Structure with Active Vibration and Noise Reduction Functions
  • A Periodic Piezoelectric Beam Structure with Active Vibration and Noise Reduction Functions

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specific Embodiment approach 1

[0019] Specific implementation mode one: refer to figure 1 and image 3 Describe this embodiment. This embodiment provides a periodic piezoelectric beam structure with active vibration and noise reduction functions. The beam structure includes a base beam 1 and N vibration and noise reduction units, where N is a positive integer and N The vibration and noise reduction units are installed equidistantly on the base beam 1 along the length direction of the base beam 1 .

[0020] In this embodiment, N vibration and noise reduction units are equidistantly installed on the base beam 1 along the length direction of the base beam 1, which is to optimize the original base beam 1 into a beam with periodically distributed vibration and noise reduction units. structure, and make it have the characteristics of a periodic beam structure, with vibration bandgap characteristics, in preparation for the adjustment of the vibration bandgap by the subsequent vibration and noise reduction unit, t...

specific Embodiment approach 2

[0021] Specific implementation mode two: refer to Figure 1 to Figure 3 Describe this embodiment. This embodiment is to further limit the vibration and noise reduction unit described in the first specific embodiment. In this embodiment, the vibration and noise reduction unit includes a piezoelectric sensor 2 and a piezoelectric actuator 3 , the controller 4 and four wires 5, the negative signal input end of the piezoelectric sensor 2 is attached to a side wall of the base beam 1, the positive signal output end and the negative signal input end of the piezoelectric sensor 2 are respectively connected to each other through a wire 5 The signal input ends of the controller 4 are connected, the negative action output end of the piezoelectric actuator 3 is attached to the other side wall of the base beam 1, the negative action output end and the positive signal input end of the piezoelectric actuator 3 are respectively It is connected to the signal output terminal of the controller ...

specific Embodiment approach 3

[0023] Specific implementation mode three: refer to Figure 1 to Figure 3 This embodiment is described. This embodiment is to further limit the piezoelectric sensor 2 and the piezoelectric actuator 3 described in the second specific embodiment. In this embodiment, it is characterized in that: the piezoelectric sensor 2 and the piezoelectric actuator The electric actuators 3 are piezoelectric sheets. Other compositions and connection methods are the same as those in the second embodiment.

[0024] In this embodiment, the piezoelectric sensor 2 and the piezoelectric actuator 3 use piezoelectric sheets because the piezoelectric sheets will generate voltage when they deform, and the voltage when one of the piezoelectric sheets is deformed will be used as a feedback signal Pass it to the controller 4, and the controller 4 processes the signal into a new voltage and feeds it back to another piezoelectric sheet. The other piezoelectric sheet will change the stiffness according to th...

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Abstract

A periodic piezoelectric beam structure with active vibration reduction and noise reduction functions belongs to the technical field of engineering vibration reduction and noise reduction. The problem that the vibration and noise reduction effect of the structure is poor under wide excitation frequency, the present invention includes the base beam and N vibration and noise reduction units, N is a positive integer, and the N vibration and noise reduction units are along the length of the base beam The direction equidistant is installed on the base beam, and the invention is mainly used for load-bearing beams in engineering buildings, and also has application prospects in longitudinal and transverse frames of ships.

Description

technical field [0001] The invention belongs to the technical field of engineering vibration reduction and noise reduction, in particular to a periodic piezoelectric beam structure with active vibration reduction and noise reduction functions. Background technique [0002] As an important load-bearing mechanism, the beam supports the entire weight of the components in the upper frame of the building and the roof, and is the most important part of the upper frame of the building. There are different names depending on the specific position, detailed shape, and specific functions of the beam. When an external force is applied to the beam, local vibration will be generated, which seriously affects the stability of the supporting beam body. Therefore, some vibration reduction designs will be carried out when the beam body is used. [0003] Vibration reduction design is of great significance to engineering structures. The periodic beam structure is characterized by vibration ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/172
CPCE04B1/82E04B1/98E04C3/02
Inventor 李凤明陈川
Owner HARBIN ENG UNIV
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