Series-mechanism adjustable passive negative-stiffness damper

A negative stiffness and damper technology, applied in building components, building structures, earthquake-proof, etc., can solve the problems of complex, limited negative stiffness, and semi-active damper performance.

Active Publication Date: 2017-06-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the negative stiffness damping force of active and semi-active control requires the support of controllers, sensors, and external energy sources to realize it i...

Method used

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  • Series-mechanism adjustable passive negative-stiffness damper
  • Series-mechanism adjustable passive negative-stiffness damper
  • Series-mechanism adjustable passive negative-stiffness damper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] combine figure 1 As shown, the positive and negative stiffness series mechanism of the present embodiment includes positive and negative stiffness units, and the positive stiffness unit includes a mechanical spring 2 and upper and lower connectors 1.3, and the two ends of the mechanical spring 2 are respectively connected to the upper and lower The connecting piece 1.3 is fixedly connected to ensure that the mechanical spring 1 can withstand the reciprocating load of tension and compression;

[0027] The negative stiffness unit includes an outer frame 7, two preload springs 6, a guide rod 5 and a slider 4, the lower end of the guide rod 5 is fixedly connected to the center of the bottom surface of the outer frame 7, and the slider 4 is sleeved on the guide rod 5 It can freely and smoothly move along the guide rod 5, the two sides of the slider 4 are respectively connected to one end of a preload spring 6, and the other end of each preload spring 6 is hinged to the inner...

Embodiment 2

[0030] combine figure 2 As shown, an adjustable passive negative stiffness damper with a series mechanism includes the positive and negative stiffness series mechanism described in Example 1 and an ordinary damper. The ordinary damper can be any dissipative energy output such as viscosity and friction , the upper end of the piston rod of the ordinary damper is fixedly connected in parallel with the upper connector of the positive stiffness unit, and the fixed end of the ordinary damper is fixedly connected with the outer frame of the negative stiffness unit; by replacing the mechanical spring 2 with different stiffness, it can be adjusted to achieve a larger Negative stiffness without changing the dissipated damping force.

Embodiment 3

[0032] combine image 3 , an adjustable passive negative stiffness damper with a series mechanism, including the positive and negative stiffness series mechanism described in Embodiment 1 and an ordinary damper, the ordinary damper can be any dissipative energy output such as viscosity and friction, and the ordinary The piston rod of the damper is fixedly connected with the slider of the negative stiffness unit as a part of the guide rod, and the fixed end of the ordinary damper is fixedly connected with the center of the bottom surface of the outer frame of the negative stiffness unit. The adjustable passive of the series mechanism provided by this embodiment The negative stiffness damper can be adjusted at the same time to achieve greater negative stiffness and greater energy dissipation damping force.

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Abstract

A series-mechanism adjustable passive negative-stiffness damper comprises a positive stiffness and negative stiffness series mechanism, and a common damper; the positive stiffness and negative stiffness series mechanism includes a positive stiffness unit and a negative stiffness unit; the positive stiffness unit includes a mechanical spring and upper and lower connectors, two ends of the mechanical spring are fixedly connected to the upper and lower connectors respectively, so that it is ensured that the mechanical spring can bear pull reciprocating load; the negative stiffness unit includes an outer frame, two pre-compression springs, a guide rod and a slider, the lower end of the guide rod is fixedly connected to the bottom center of the outer frame, the slider sleeves the guide rod and can slide freely along the guide rod to integrally serially connect a damping unit and the positive stiffness and negative stiffness series mechanism, and it is possible to adjust stiffness without changing damping; the common damper is partially parallelly connected to positive stiffness or negative stiffness through structures, and it is accordingly possible to adjust the stiffness and damping. The series-mechanism adjustable passive negative-stiffness damper can provide improved aseismic effect for civil structures, especially super-large civil structures.

Description

technical field [0001] The invention belongs to the field of vibration control of civil engineering structures, and in particular relates to an adjustable passive negative stiffness damper with a series mechanism. Background technique [0002] With economic development and technological progress, the volume of civil structures is getting larger and larger. For example, the Guangzhou TV Tower in China is 600m high, and the Burj Khalifa in Dubai has a total height of 828m. The meter level reaches 1088m, and the main span of Russky Island Bridge built in 2012 reaches 1102m. As the main stress-bearing component of the cable-stayed bridge, the longest cable-stayed cable in the Russo Island Bridge is 483m, while the longest cable-stayed cable in the Sutong Bridge in China reaches 577m. The increase in volume makes the structure or component period longer and the damping smaller. In the event of random sudden natural disasters such as earthquakes and strong winds, strong vibration...

Claims

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Application Information

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IPC IPC(8): E04B1/98E04H9/02
CPCE04H9/02E04H9/0235E04H9/0215
Inventor 周鹏李惠刘敏
Owner HARBIN INST OF TECH
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