Piezoelectric-SMA composite variable friction intelligent damper

A technology of memory alloy and memory alloy wire, which is applied in the field of friction dampers, can solve problems such as difficulties, troublesome layout, increased construction sequence and cycle, and achieve good repairability, convenient installation and disassembly, and good energy consumption.

Inactive Publication Date: 2011-07-20
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above dampers all use a single energy dissipation mechanism or a single energy dissipation element and material to dissipate energy, and the damping force (yield force) and initial stiffness provided are limited.
[0011] In order to meet the actual engineering needs, the energy dissipator (damper) must be made large enough to meet the requirements. Generally, the damping force of the energy dissipator used in building structures should be above 500kN. If the damping force is too small, the number of dampers required If there are too many, it will be very troublesome to arrange, the construction sequence and cycle will increase, and it will also affect the use of building space
Especially for semi-active control dampers, too many will lead to complex control system and reduce the reliability of the entire control system
Moreover, most of the existing dampers are unidirectional, and the dampers need to be arranged along the x and y directions in the horizontal direction. complex and difficult
[0012] (2) Vertical isolation of seismic isolation structures
First of all, the rubber isolation pad is mainly designed according to the requirements of horizontal isolation, and its vertical stiffness and damping are not optimal for vertical isolation; secondly, although the vertical seismic response of the isolation structure will not affect the The seismic isolation layer is harmful, but it may cause the upper structural column to generate a large axial seismic force, which will cause the total axial compression ratio of the structural column to exceed the allowable value

Method used

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  • Piezoelectric-SMA composite variable friction intelligent damper
  • Piezoelectric-SMA composite variable friction intelligent damper
  • Piezoelectric-SMA composite variable friction intelligent damper

Examples

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Effect test

Embodiment 1

[0056] A piezoelectric-SMA composite variable friction smart damper, such as figure 2 , 3 As shown in and 9, it includes a circular upper cover plate 1 and a circular lower connection fixing plate 2 fixed with the upper cover plate 1 by means of large-diameter and high-strength bolts 9. The lower end of the upper cover plate 1 is connected to the lower end The upper end of the fixed plate 2 is provided with a friction plate 8. The friction plate 8 can be a truck brake pad with a diameter of 600mm. A driver level fixedly connected to the upper structure of the seismic isolation layer is provided between the upper cover plate 1 and the lower connecting fixed plate 2. Positioning plate 3, 12 SMA wire regulating valves 4 are vertically arranged on the horizontal positioning plate 3 of the driver, 12 SMA wires 10 are arranged between the upper cover plate 1 and the lower connecting and fixing plate 2, each SMA wire 10 The two ends of the SMA wire are respectively fixed on the upper ...

Embodiment 2

[0067] A piezoelectric-SMA composite variable friction smart damper. Between the upper cover plate 1 and the lower connecting and fixing plate 2, there are also 4 laminated piezoelectric actuators 6 fixed at the center of the horizontal positioning plate 3 of the actuator, such as Figure 7 As shown, the arrangement of the laminated piezoelectric actuator 6 on the actuator horizontal positioning plate 3 is translational, that is, the laminated piezoelectric actuator 6 moves with the actuator horizontal positioning plate 3 during a horizontal earthquake. One of them is arranged in the center of the horizontal positioning plate 3 of the driver, and the other three are evenly arranged in the circumferential direction of the laminated piezoelectric actuator 6 located in the center of the horizontal positioning plate 3 of the driver. The laminated piezoelectric actuator 6 is preferably an existing laminated piezoelectric ceramic actuator.

[0068] The rest of the structure is the same ...

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Abstract

The invention discloses a piezoelectric-SMA composite variable friction intelligent damper, belonging to the field of civil engineering structure vibration damping control. The piezoelectric-SMA composite variable friction intelligent damper comprises an upper cover plate and a lower connecting fixed plate, wherein a driver horizontal locating plate fixedly connected with the upper part structureof a vibration isolating layer is positioned between the upper cover plate and the lower connecting fixed plate; the driver horizontal locating plate is provided with a plurality of SMA wire adjusting valves along the vertical direction; a plurality of SMA wires are arranged between the upper cover plate and the lower connecting fixed plate; the two ends of each SMA wire are respectively fixed onthe upper cover plate and the lower connecting fixed plate; the SMA wires pass through the corresponding SMA wire adjusting valves; and a laminated piezoelectric driver is also arranged between the upper cover plate and the lower connecting fixed plate. The piezoelectric-SMA composite variable friction intelligent damper has simple structure, convenient assembly and disassembly as well as good repair capacity after vibration; the intelligent damper has self-resetting capability, higher passive damping under the condition of power failure, low initial rigidity and good vibration isolation effect; and the SMA wires can provide vertical uplift bearing capacity and supply vertical damping when in vertical vibration.

Description

Technical field [0001] The present invention relates to the field of civil engineering structure vibration reduction control, in particular to the field of structural engineering suitable for building damping and anti-seismic and wind-induced vibration control, etc., particularly suitable for seismic isolation engineering, for engineering structures under the action of earthquake or wind-induced vibration The structure reflects the friction damper that has a restraining effect and can realize semi-active control. Background technique [0002] The effects of earthquakes and strong winds pose a serious threat to the safety and comfort of civil engineering structures. How to effectively reduce the response of the engineering structure under dynamic loads such as earthquakes and strong winds and improve the seismic and wind resistance of the structure is the subject of civil engineering One of the urgent problems to be solved. [0003] In the 1950s, Kobori of Japan proposed the concep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04B1/98
Inventor 戴纳新谭平周福霖
Owner HUNAN UNIV
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