CN103758029B - A kind of magneto mass tuning damping unit controlled for suspension cable vibration damping - Google Patents
A kind of magneto mass tuning damping unit controlled for suspension cable vibration damping Download PDFInfo
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- CN103758029B CN103758029B CN201410013162.9A CN201410013162A CN103758029B CN 103758029 B CN103758029 B CN 103758029B CN 201410013162 A CN201410013162 A CN 201410013162A CN 103758029 B CN103758029 B CN 103758029B
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Abstract
The present invention is a kind of magneto mass tuning damping unit controlled for suspension cable vibration damping, with elastomer, watt shape permanent magnet is wrapped up, form " elasticity permanent magnet ", 12 " elasticity permanent magnets " are coiled into a ring with the form that N, S are extremely end to end, copper sheet surface being scribbled vaseline inserts in the space between " elasticity permanent magnet ", forms the core ring of this damping unit; Core ring is loaded sleeve, and seals up with end casing.When Inclined Cable Vibration, utilize the stiffness difference between elastomer and copper sheet, make copper sheet cutting magnetic induction line in the magnetic field that permanent magnet produces, Inclined Cable Vibration energy is consumed by the resistance heat effect of copper sheet, thus forms permanent magnet damping.Meanwhile, permanent magnet and elastomer constitute TMD system, further enhancing the effectiveness in vibration suppression of device.This device is arranged on the amplitude maximum of suspension cable, can reach stronger effectiveness in vibration suppression.
Description
Technical field
The present invention relates to a kind of magneto mass tuning damping unit controlled for stay cable of cable-stayed bridge vibration damping, its feature is that inner copper sheet does cutting magnetic induction and answers line to move in the magnetic field that permanent magnet produces, by the vibrational energy of the resistance heat effect dissipation drag-line of copper sheet, permanent magnet and elastomer form TMD system simultaneously, suppress the vibration of suspension cable further.
Background technology
Disaster caused by a windstorm causes massive losses to the mankind, is one of several main natural calamity that human society faces.The direct economic loss that the whole world is caused due to disaster caused by a windstorm every year can reach tens billion of dollar, wherein just reach 24,600,000,000 dollars for China, and there is the trend increased year by year, bring great loss to people's lives and properties, greatly exceed the Loss of Life and property that earthquake causes.Wherein, the destruction of civil engineering structure under high wind effect and infringement are the important composition parts of whole disaster caused by a windstorm loss, and especially large span Flexible bridge is typical wind sensitive structure.
Cable stayed bridge is as a kind of primary structure form of Ultra-Long Spans Flexible bridge, and its wind resistance is especially subject to domestic and international professional person and pays close attention to.Along with the progress of material and design construction technology, cable stayed bridge across footpath in continuous increase.Meanwhile, suspension cable has from great, that flexibility is large, damping is little feature, larger vibration is very easily there is under the excitation of wind load and tower beam two end motion, the vibration of drag-line can cause drag-line shortening in application life, the destruction of drag-line and girder, king-tower connecting portion, thus affect the normal use of structure, wherein the wind and rain of drag-line shakes is one the most serious in inhaul cable vibration, the vibration isolation of drag-line has also become during cable stayed bridge is built needs one of key technical problem solved, and is subject to the extensive concern of wind engineering of bridge circle.
Can change the aeroperformance of suspension cable structure in the compacting of drag-line surface pit and winding steel wire etc., be control the large span stayed-cable bridge inhaul cable vibration particularly effective ways that shake of wind and rain.But sometimes played inhibition is not clearly, especially overlength drag-line effect is poorer, and therefore the former only suppresses the vibration of suspension cable as supplementary means at present.
The inhaul cable vibration suppressing method that damper is domestic and international extensive use is added in end, suspension cable nearly bridge floor place.Damper conventional at present mainly contains Effects of Viscous Fluid Damper, MR damper and permanent-magnet damper etc.Wherein Effects of Viscous Fluid Damper: according to fluid motion, particularly when fluid is made by the principle that can produce viscosity resistance during throttle orifice is a kind of with rigidity, velocity-dependent damper, the drag-line of yangtze river in nanjing two bridge be exactly viscous damper.The shortcoming of Effects of Viscous Fluid Damper is difficult to maintenance management, and the time has been grown and easily occurred the problems such as leakage of oil.MR damper (MR damper) is a kind of novel structure semi-automatic control device occurred the nearly more than ten years, have that damping force size is controlled, volume is little, respond the advantages such as fast, shown good application prospect, the long drag-line of such as, part on Su-Tong Brideg just have employed MR damper.The shortcoming of MR damper is that principle relative complex, price are relatively high.
When non-magnetic conductor makes cutting magnetic line movement in the magnetic field that permanent magnet produces, will produce in conductor and induct accordingly or induced electromotive force, thus form the electric current of similar whirlpool, be i.e. current vortex.According to Lenz's law (faradic effect always revolts the reason causing it), for the situation of conductor cutting magnetic line movement in magnetic field, also can form the damping force of both obstructions relative motion, thus cause vibrational energy to be consumed by the resistance heat effect of conductor, thus form permanent magnet damping.Permanent magnet damping is the extremely promising damping form of one, the permanent-magnet damper made therefrom is at present for space structure vibration isolation, braking automobile and high-speed train braking etc., achievement in research is also abundanter, but its research and apply in applications in civil engineering is also fewer.
Tuned mass damper (TMD) is also vibration control apparatus conventional in civil engineering.It is made up of with damping element (dissipative structure vibrational energy) mass, flexible member (be used for tuned frequency), near the vibration frequency its vibration frequency being adjusted to controlled main structure, carrys out change structure vibration characteristics accordingly, to reach damping effect.For the mass ratio (ratio of the quality of the quality main structure of TMD minor structure) of setting, based on the Optimality Criteria of definition, there is an optimal frequency ratios and Optimal damping ratio in TMD usually.Frequency more easily adjusts, mainly through adjustment flexible member as realizations such as the rigidity of spring.The setting of damping and adjust then relative difficult, especially after TMD processes.The damping element of current small-sized TMD generally adopts rubber, and large-scale TMD then adopts oil damper etc.
Because damper is arranged on stay cable end usually, facts have proved, drag-line is very little at this place's vibration displacement, and absorbing vibrational energy is limited, is difficult to significantly main effective controls of judder product such as wind and rain shake.Therefore, want the wind-induced vibration suppressing suspension cable preferably, damper must be set up at its amplitude maximum.But due to the particularity of suspension cable structure and the restriction of current art level, traditional damper cannot be too high from bridge floor, makes its effectiveness in vibration suppression be extremely restricted.If permanent magnet damping and TMD vibration absorber can be carried out co-design research and development, and be applied in the vibration damping control of drag-line, be then expected to obtain comparatively significant control effects.The energy that this design directly utilizes structure itself vibrates to produce controls structural vibration, turns waste into wealth and without the need to extraneous energy supply, obviously energy-conserving and environment-protective more.Compared with Effects of Viscous Fluid Damper, MR damper etc. that pulling cable damping is conventional, it had both overcome the problem of Effects of Viscous Fluid Damper leakage of oil and not easily maintenance, achieved again being separated of rigidity and damping, had again price and power savings advantages relative to MR damper.Therefore, permanent-magnet damper has boundless application prospect in suspension cable vibration damping field.
Summary of the invention
Technical problem: the object of this invention is to provide a kind of magneto mass tuning damping unit controlled for suspension cable vibration damping, this device breaches the restriction that traditional Effects of Viscous Fluid Damper or MR damper are arranged on nearly bridge floor place, the drag-line middle-end that suspension cable amplitude is maximum can be arranged on, produce induced-current with maximum cutting magnetic line.The energy that this patent directly utilizes drag-line itself vibrates to produce controls inhaul cable vibration, and effectiveness in vibration suppression comparatively conventional damper have a distinct increment.
Technical scheme: a kind of magneto mass tuning damping unit for the control of suspension cable vibration damping of the present invention comprises watt shape permanent magnetic strip, elastomer, copper sheet, sleeve, end casing, suspension cable and a high strength epoxy adhesive; Wherein with elastomer, watt shape permanent magnet is wrapped up, form " elasticity permanent magnet ", amount to 12; 12 " elasticity permanent magnets " are coiled into a ring with the form that N, S are extremely end to end, between " elasticity permanent magnet ", leave space, then insert the copper sheet that surface scribbles vaseline, form the core ring of this damping unit; Core ring is loaded sleeve, and seals up with end casing.
Watt shape permanent magnetic strip adopts neodymium iron boron strong magnet; Sleeve and end casing all adopt carbon fibre material to make, and sleeve and end casing inwall scribble high strength epoxy adhesive, to ensure the bonding strength of each parts of this damping unit.
" elasticity permanent magnet " is the bar permanent magnet that periphery is wrapped with elastomer, and " elasticity permanent magnet " and copper sheet carry out interval layout.When suspension cable produces vibration under the outside dynamic loading such as wind, vehicle, because having relative displacement between permanent magnet and copper sheet, permanent magnet will drive elastomer to compress, and the friction of generation can accelerate rubber loss, and cause loosening between damper member.Therefore coat vaseline on each copper sheet surface, to reduce the sliding friction between permanent magnet and copper sheet, weaken the life consumption of the vibration absorber entirety brought thus.
Before erection suspension cable, this damping unit is mounted and fixed in the middle part of suspension cable, the inertia force of the damper brought due to inhaul cable vibration will be very large, the damper being arranged on amplitude maximum in the middle part of drag-line is easily damaged phenomenon, especially when the quality of damper and volume larger time.Therefore this damping unit adopts lightweight, high-strength carbon fiber skin to reduce its quality, is within 2 times of suspension cable diameter, in order to avoid drag-line sag is excessive by this damping unit along drag-line direction length setting simultaneously.
When concrete engineering is applied, utilize the high strength epoxy adhesive with high-strength adhesion stress kernel thimble, sleeve and end casing to be assembled, and this damping unit is fixed on suspension cable.To ensure that the safe, effective, stable of vibration absorber and durability are for target, can install single damper device in the middle part of drag-line, also visual guy cable length and actual needs are arranged at a certain distance, install multiple damper device.
Beneficial effect: permanent magnet and elastomer form a small-sized TMD damping system, the vibrational energy of Absorbable rod part drag-line.Meanwhile, copper sheet cutting magnetic induction line repeatedly in the magnetic field that permanent magnet produces, make copper sheet and permanent magnet define permanent magnet damping system, thus the resistance heat effect be converted in copper sheet consumes by the vibrational energy of drag-line.Wherein, N, S-phase, apart from shorter, to form shorter magnetic loop, reduce magnetic potential loss, enhance the energy dissipation capacity of this permanent magnet damping system.Above-mentioned TMD system and permanent magnet damping system play a role jointly, ensure that the result of use of this vibration absorber.In addition, the energy that this patent directly utilizes drag-line itself vibrates to produce controls inhaul cable vibration, without the need to extraneous energy supply, compares the energy-conserving and environment-protective more of existing pulling cable damping damper.Can predict, along with the continuous construction of the growing in intensity of typhoon, large span stayed-cable bridge and the whole world are to the growing interest of energy-conserving and environment-protective, this Novel bracing cable vibration absorber will be used widely, and produces significant economic and social benefits.
Accompanying drawing explanation
Fig. 1 is cross-sectional configuration schematic diagram of the present invention;
Fig. 2 is the vertical section constructional drawing along I-I direction in Fig. 1;
Fig. 3 is the vertical section constructional drawing along II-II direction in Fig. 1;
Fig. 4 is a watt profile outline for shape permanent magnet;
Fig. 5 is the profile outline of elastomer;
Fig. 6 is the floor map of end casing;
Have in figure: watt shape permanent magnetic strip 1, elastomer 2, copper sheet 3, sleeve 4, end casing 5, suspension cable 6, high strength epoxy adhesive 7, vaseline 8.
Detailed description of the invention
Magneto mass tuning damping unit for suspension cable vibration damping of the present invention comprises a watt shape permanent magnetic strip 1, elastomer 2, copper sheet 3, sleeve 4, end casing 5, suspension cable 6, high strength epoxy adhesive 7 and vaseline 8.Wherein with elastomer 2, a watt shape permanent magnet 1 is wrapped up, formed above-mentioned " elasticity permanent magnet ", amount to 12.12 " elasticity permanent magnets " are coiled into a ring with the form that N, S are extremely end to end, between " elasticity permanent magnet ", leave suitable space, then insert the copper sheet 3 that surface scribbles vaseline 8, form the core ring of this damping unit.Core ring is loaded sleeve 4, and seals up with end casing 5.
The neodymium iron boron strong magnet that watt shape permanent magnet 1 adopts at present the alloy permanent-magnet material of comparatively main flow to make.What Fig. 4 showed is a watt profile outline for shape permanent magnet 1.
In Fig. 1, " elasticity permanent magnet " and copper sheet 3 interval are arranged, copper sheet 5 surface scribbles vaseline 8, and to reduce to compress by elastomer 2 frictional dissipation between copper sheet 5 and elastomer 2 caused, Fig. 5 is the profile outline of elastomer 2.
In Fig. 1, core ring loads in sleeve 4, and sleeve 4 and end casing 5 all adopt carbon fibre material to make, and sleeve 4 inwall scribbles high strength epoxy adhesive 7, with the inwall secure bond by core ring and sleeve 4.Fig. 6 is the plan view of end casing 5, with high strength epoxy adhesive 7, end casing 5 is mounted and fixed on this damping unit two ends equally.Core ring, compact siro spinning technology between sleeve 4 and end casing 5.After more than assembling terminates, seal by high strength epoxy adhesive 7 pairs of device entirety, make moisture, rainwater etc. cannot access to plant inner, thus the durability of assurance device.
As shown in Figure 1, 2, 3, this damping unit is enclosed within the appointed part of suspension cable 6, and with high strength epoxy adhesive 7, this damping unit is fixed on suspension cable 6.In order to strengthen the adhesion stress on this vibration absorber and suspension cable surface, carry out surface finish process in the corresponding installation position of drag-line.
Claims (2)
1., for the magneto mass tuning damping unit that suspension cable vibration damping controls, it is characterized in that: this damping unit comprises a watt shape permanent magnetic strip (1), elastomer (2), copper sheet (3), sleeve (4), end casing (5), suspension cable (6) and high strength epoxy adhesive (7); Wherein use elastomer (2) to be wrapped up by watt shape permanent magnet (1), form " elasticity permanent magnet ", amount to 12; 12 " elasticity permanent magnets " are coiled into a ring with the form that N, S are extremely end to end, between " elasticity permanent magnet ", leave space, then insert the copper sheet (3) that surface scribbles vaseline (8), form the core ring of this damping unit; Core ring is loaded sleeve (4), and seals up with end casing (5); Within this damping unit is 2 times of suspension cable (6) diameter along drag-line direction length setting.
2. the permanent magnet damping device controlled for suspension cable vibration damping according to claim 1, is characterized in that: watt shape permanent magnetic strip (1) adopts neodymium iron boron strong magnet; Sleeve (4) and end casing (5) all adopt carbon fibre material to make, and sleeve (4) and end casing (5) inwall scribble high strength epoxy adhesive (7), to ensure the bonding strength of each parts of this damping unit.
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| CN201410013162.9A CN103758029B (en) | 2014-01-10 | 2014-01-10 | A kind of magneto mass tuning damping unit controlled for suspension cable vibration damping |
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| CN201410013162.9A CN103758029B (en) | 2014-01-10 | 2014-01-10 | A kind of magneto mass tuning damping unit controlled for suspension cable vibration damping |
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| CN103758029B true CN103758029B (en) | 2015-10-07 |
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Families Citing this family (8)
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| CN105235711A (en) * | 2015-11-06 | 2016-01-13 | 柳立红 | Permanent magnetic retarder used for railway train marshalling |
| CN107366225B (en) * | 2017-08-11 | 2019-05-31 | 东南大学 | A kind of current vortex friction pendulum vibration absorption and isolation support |
| CN107354867B (en) * | 2017-08-15 | 2019-04-30 | 东南大学 | A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management |
| CN108166641B (en) * | 2017-12-21 | 2019-07-30 | 东南大学 | A kind of current vortex three-dimensional vibration absorber |
| CN109295853B (en) * | 2018-11-22 | 2024-04-23 | 华东交通大学 | Windmill type stay cable vibration reduction system |
| CN109706832B (en) * | 2019-01-23 | 2024-03-29 | 河北工业大学 | Electromagnetic ternary vibration damper suitable for stay cable multi-order vibration |
| US11946524B2 (en) | 2020-06-15 | 2024-04-02 | Dalian University Of Technology | Double-ring shaped strong magnet array nonlinear dynamic vibration absorber for vibration mitigation of suspender cables and design method thereof |
| CN112878177B (en) * | 2021-02-03 | 2023-04-28 | 大连交通大学 | Sleeve type vibration control device for suspension bridge sling |
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