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Passive spring-damping negative stiffness damper for inhaul cable vibration mitigation

A negative stiffness, oil damper technology, applied in the direction of shock absorber-spring combination, shock absorber, spring/shock absorber, etc., can solve practical application limitations, complex operation and maintenance of semi-active control system, etc. Control effect, displacement increase, effect of large damping ratio

Inactive Publication Date: 2015-05-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the semi-active control based on the magneto-rheological damper requires the sensor to collect the vibration information of the cable in real time and calculate the control command through the controller, which makes the operation of the semi-active control system based on the magneto-rheological damper complex and requires real-time maintenance. , making its practical application limited

Method used

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  • Passive spring-damping negative stiffness damper for inhaul cable vibration mitigation
  • Passive spring-damping negative stiffness damper for inhaul cable vibration mitigation
  • Passive spring-damping negative stiffness damper for inhaul cable vibration mitigation

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Effect test

Embodiment 1

[0016] combine figure 1 , a passive spring-damping negative stiffness damper for cable vibration reduction, including two sets of negative stiffness parts based on precompressed springs, connecting arms, oil damper parts and an outer frame, and two sets of negative stiffness parts based on precompressed springs Symmetrically located on both sides of the connecting arm 10, and hinged with both ends of the connecting arm 10, each set of negative stiffness parts based on pre-compressed springs includes sliding bearings 1, pre-compressed springs 2, baffles 3, linear bearing rods 4, support arms 5. The baffle plate 3, the pre-compression spring 2 and the sliding bearing 1 are sequentially installed on the linear bearing rod 4. The sliding bearing 1 can move freely along the slot on the linear bearing rod 4. The pre-compression spring 3 is located between the sliding bearing 1 and the baffle plate 3. Between, one end of the support arm 5 is fixedly connected with the outer frame 6, ...

Embodiment 2

[0018] combine figure 2 , the invention provides a passive spring-damping negative stiffness damper for cable vibration reduction, the bottom of the passive spring-damping negative stiffness damper is fixedly installed on the main girder of a cable-stayed bridge, and the piston of the passive spring-damping negative stiffness damper The upper end of the rod is installed on the cable. When the cable vibrates greatly under the excitation of wind, wind-rain, etc., the passive spring-damping negative stiffness damper generates negative stiffness output, which increases the displacement response of the connection and increases energy consumption. , to provide a larger damping ratio for the cable, and achieve better control effect.

Embodiment 3

[0020] combine Figure 3-4 , the effectiveness of a passive spring-damping negative stiffness damper for cable vibration reduction of the present invention has been well verified in model tests, image 3 It is a comparison chart of force-displacement hysteresis curves between the damper of the present invention and the oil damper (the solid line is the oil damper, and the dotted line is the damper of the present invention), it can be seen that the output of the damper of the present invention has obvious negative stiffness characteristics; Figure 4 It is a control effect comparison chart of the damper of the present invention and the oil damper, that is, the relationship between the first-order and second-order additional modal damping ratios of the cable and the installation position (the dotted line is the result of no control, and the triangular line is the result of the oil damper , the square marking is the result of the damper of the present invention). It can be seen ...

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Abstract

The invention provides a passive spring-damping negative stiffness damper for inhaul cable vibration mitigation. The passive spring-damping negative stiffness damper for inhaul cable vibration mitigation comprises two negative stiffness parts based on precompression springs, a connecting arm, an oil damper part and an outer frame. The two negative stiffness parts based on the precompression springs are symmetrically located on the two sides of the connecting arm and hinged to the two ends of the connecting arm. The connecting arm is fixedly connected with the upper end of a piston rod of the oil damper part. The bottom end of an oil damper is fixedly connected with the bottom end of the outer frame. The passive spring-damping negative stiffness damper for inhaul cable vibration mitigation can achieve negative stiffness under passive control, thereby remarkably improving the control effect of an original oil damper over inhaul cable vibration; different negative stiffness and control effects can be achieved by adjusting the stiffens coefficient, the original length and the compression amount of the precompression springs.

Description

technical field [0001] The invention relates to the field of cable vibration reduction control, in particular to a passive spring-damping negative stiffness damper for cable vibration reduction. Background technique [0002] With the increase of the span of the cable-stayed bridge, the length of the cable-stayed cables, which are the main stress components, is also increasing. The increase of the length increases the flexibility of the cable and reduces the damping. Under the action of external loads such as wind and wind-rain, the large vibration of the cable sometimes occurs. This vibration will cause fatigue damage and accelerated corrosion of the cables, so suppressing the large vibrations of the cables has become a challenge in bridge engineering. [0003] At present, based on the control mechanism, the vibration reduction control methods of the cables are mainly divided into three categories: one is aerodynamic measures, which mainly change the surface shape of the ca...

Claims

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Application Information

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IPC IPC(8): E01D19/16
CPCE01D19/16F16F13/00
Inventor 李惠周鹏刘敏
Owner HARBIN INST OF TECH
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