CN205152774U - Harmonious mass damper of assembled current vortex - Google Patents

Abstract

The utility model relates to a civil engineering structure vibration control field, a specific harmonious mass damper of assembled current vortex and manufacturing method of relating to, TMD rigidity component adopts the helical compression spring, the harmonious quality piece of TMD adopts the multi -disc steel sheet to concatenate, has guaranteed manual assembly's maneuverability, the magneto electricity eddy -current damper that the TMD damping element adopted the magnetic circuit to optimize, set up indoor at harmonious quality piece steel board cavity, compact structure, through adjusting the permanent magnet fixed on the bottom plate and the distance between the quality piece steel sheet, realize the regulation of TMD frequency. In addition, the TMD global design is long and thin strip, and is longer along foot bridge span direction, transversely narrower along the foot bridge, is convenient for install in foot bridge railing department, has reduced the influence of TMD to foot bridge function and outward appearance. The utility model discloses vertical electric eddy current damping TMD has compact structure, easily site assembly, frequency can continuously adjustable, the durability is good, is convenient for install in outstanding features such as foot bridge railing departments.

Description

A kind of assembling eddy current tuned mass damper

Technical field

The utility model relates to vibration control of civil engineering structure field, is specifically related to a kind of eddy current tuned mass damper being applicable to large span pedestrian overcrossing vertical motion and controlling.

Background technology

Along with the development of urbanization process and grade-separated traffic, the construction of domestic Long span pedestrian overcrossing gets more and more, and China's vertical fundamental frequency of existing pedestrian overcrossing design specifications regulation pedestrian overcrossing must be greater than 3.0Hz, this is difficult to accomplish for the single span pedestrian overcrossing more than 40m.For convenience of construction, overpass many employings simply supported steel box girder structure.But steel structure footbridge inherent damping is lower on the one hand, single order vertical motion intrinsic frequency and pedestrian's normal gait frequency of another aspect large span pedestrian overcrossing are comparatively close, very easily bring out resonance.Now pedestrian overcrossing amount of deflection, stress will substantially exceed static analysis value, and pedestrian's comfort level is also difficult to meet the demands.If things go on like this, the safety of structure and normal use will be affected.

The prior art solving simply supported steel box girder pedestrian overcrossing comfortableness problem mainly contains: increase the frequency adjusting method that deck-molding, change structure support system (as portal-rigid frames), combined structure system (truss is set up in both sides above beam body) etc. increase structure stiffness by itself, makes the satisfied China " Selection of Urban Pedestrian Overpass and underpass technical specification " (CJJ69-95) of its vertical fundamental frequency should not be less than the regulation of 3Hz; On pedestrian overcrossing, additional energy-dissipating device increases the damping of structure, and this powered shock absorption device of more employing tuned mass damper (TMD) reduces the vibration amplitude of pedestrian bridge under equal visitors flowrate, thus meets the comfortableness requirement of related specifications.Comparatively speaking, the frequency adjusting method financial cost based on stiffness measurements is higher, and the energy-obsorbing and damping measure in recent years based on TMD obtains gradually in pedestrian overcrossing vibration isolation field and applies.

The damping form of existing pedestrian bridge vertical vibration damping TMD is mainly fluid viscous damper (if the patent No. is 201010137516.2 disclosed " a kind of tuned mass damper, TMDs of suspension ").But viscous damper exists leakage of oil, not easily maintenance, and damping is all difficult to the problems such as adjustment in the later stage.Recently, also software engineering researchers invent eddy-current damping TMD (be 201010022003.7 disclosed " permanent-magnet type eddy current tuned mass dampers " see the patent No.) is had, and be used successfully to steel arch bridge elongate boom vibration damping (see " experimental study of steel arch bridge rigid elongate suspension rod vibration damping tuned mass damper ", science and technology and engineering, 2013,19th phase, 5555-5560 page).Outstanding advantages eddy-current damping being applied to TMD has: damper does not need directly to contact with structure, without any frictional damping; Without fluid in damper, without the need to seal, there will not be any leakage; Damper without additional stiffness, thus can not affect the frequency parameter of TMD, achieves being separated completely of TMD rigidity and damping.But there is too simple, the easy leakage field of magnetic circuit in eddy-current damping TMD at present, the problems such as durability is low, and eddy-current damping factor design calculates inaccurate, in-site installation difficulty.

The effectiveness in vibration suppression of TMD and TMD, agent structure frequency tuning degree are therebetween closely related, for guaranteeing effectiveness in vibration suppression, generally all require that the frequency of TMD has certain adjustment leeway.The frequency trim method of existing TMD realizes mainly through increase and decrease quality, the method belongs to widely used routine techniques, also the rigidity having the mode by increasing and decreasing little spring to change TMD realizes the adjustment (if the patent No. is " 201320560965.7 " disclosed " frequency regulation arrangement of pendulum-type tuned mass damper ") of TMD frequency then, but these two kinds of methods are all difficult to continuous, the fine adjustment that realize TMD frequency.

In addition, for newly-built pedestrian overcrossing, TMD can be directly installed on steel box-girder inside in work progress, for existing (just under arms) pedestrian bridge, TMD is directly installed on steel box-girder inside and has difficulties.That is, existing pedestrian bridge vibration damping is had higher requirement for the installing space of TMD and mode.

Utility model content

The utility model for prior art exist military service pedestrian overcrossing vertical vibration damping TMD damping element poor durability, inconvenience is installed, the problem such as frequency adjustment is difficult, a kind of assembling eddy current tuned mass damper is proposed.

The technical solution of the utility model is: a kind of assembling eddy current tuned mass damper, comprise lower shoe (1), TMD main body (15) and frequency modulation device, TMD main body (15) is sleeved on the guide shaft (11) that is fixed on lower shoe (1), TMD main body (15) is supported by the helical compression spring (3) be sleeved on guide shaft (11), guide shaft (11) top is provided with limiting plate (9), establish in the below of TMD main body (15) and be at least equipped with two frequency modulation devices, described TMD main body (15) has stacked five steel plate a (4) from bottom to top successively, a slice steel plate b (5), a slice steel plate c (6), a slice steel plate d (7) and a slice steel plate e (8), the middle part of steel plate a, b forms the steel plate chamber (22) of rectangle, the middle part of steel plate c (6) is reserved with the breach installing L-type permanent magnet fixed head (12), L-type permanent magnet fixed head (12) is provided with permanent magnet (13), permanent magnet (13) is positioned at steel plate chamber (22), be provided with conductor copper coin (14) between two L-type permanent magnet fixed heads (12) in steel plate chamber (22), conductor copper coin (14) is fixedly mounted on lower shoe (1), linear bearing (25) is provided with in (21) in the guide shaft hole of steel plate d (7).

Described assembling eddy current tuned mass damper, the one of described permanent magnet (13) is preferably cuboid, the upper permanent magnet (13) of same L-type permanent magnet fixed head (12) is arranged with magnetic pole, and upper permanent magnet (13) different pole of Different L type permanent magnet fixed head (12) is arranged.

Described assembling eddy current tuned mass damper, between permanent magnet (13) on same L-type permanent magnet fixed head (12), net level length is 0.4 ~ 0.6 times of permanent magnet (13) length of side, and vertical clear distance is 0.8 ~ 1.2 times of permanent magnet (13) length of side.

Described assembling eddy current tuned mass damper, described frequency modulation device comprises lifting gear (17), be fixed on the support magnet (16) of lifting gear (17) top, and is used for adjusting the knob (18) of lifting gear.

Described assembling eddy current tuned mass damper, the manomelia of described L-type permanent magnet fixed head (12) is fixed on the reserved notch of steel plate b (5) by screw (26), and long limb is close in the square plate chamber (22) that steel plate a, b (4,5) surround.

Described assembling eddy current tuned mass damper, the lower end perforate of described conductor copper coin (14) is gripped by two pieces of angle steel (20), and two pieces of angle steel (20) are connected by bolt (19) with lower shoe (1) respectively.

Described assembling eddy current tuned mass damper, guide shaft hole (21) place of described steel plate d (7) has big hole, is provided with linear bearing (25) in big hole hole.

Described assembling eddy current tuned mass damper, the perforate of described steel plate e (8) is slightly larger than guide shaft (11) diameter, be pressed on linear bearing (25), prevent linear bearing (25) from skidding off from steel plate d (7).

Described assembling eddy current tuned mass damper, described steel plate a (4), steel plate b (5), steel plate c (6), steel plate d (7) and steel plate e (8) all prepared screw-bolt holes (23), be connected by bolt of long stem (24).

The beneficial effects of the utility model are: 1, compact conformation: it is inner that the damping element part of TMD is nested in the steel plate serving as tuning quality by the utility model, combines closely, substantially reduce the volume of device between all parts; Meanwhile, the plane projection of TMD device is slender type, can be embedded in railing position completely, reduces device and passes through and impact aesthetically on pedestrian bridge;

2, durability is high: TMD of the present utility model is all made up of metal material, and durability is higher, can ensure that damper works long hours; In later maintenance, parts can be changed at any time especially, or do the adjustment of frequency aspect; Substantially prolongs TMD application life;

3, assembling is simple, quick: TMD of the present utility model is fabricated construction, and TMD installs or when safeguarding, all without the need to this body structure that destroys a bridge, only needs manually just can complete all working, be easy to assemble at the scene during construction;

4, Optimize magnetic circult: TMD eddy-current damping structure of the present utility model, by magnetic FEM and experimental examination, achieves the optimum magnetic Circuit Design of eddy-current damping, substantially increases eddy-current damping energy efficiency.

Accompanying drawing explanation

Fig. 1 is TMD overall structure side generalized section;

Fig. 2 is L-type permanent magnet fixed head and permanent magnet mounting structure generalized section;

Fig. 3 is L-type permanent magnet fixed head fixing permanent magnet structural representation;

Fig. 4 is that conductor copper coin and lower shoe fixedly mount structural representation;

Fig. 5 is TMD overall appearance texture edge schematic diagram;

Fig. 6 is TMD overall appearance structure end view;

Fig. 7 is the two-way cross-sectional view of TMD overall structure;

Fig. 8 is the structural representation of steel plate a and steel plate b;

Fig. 9 is the structural representation of steel plate c;

Figure 10 is the structural representation of steel plate d;

Figure 11 is the structural representation of steel plate e;

Figure 12 is that TMD installs partial enlargement structural representation at overline bridge;

Figure 13 is that TMD installs symmetrical structure schematic diagram on overline bridge;

In figure, 1 is lower shoe, 2 is the spring collar, 3 is helical compression spring, 4 is steel plate a, 5 is steel plate b, 6 is steel plate c, 7 is steel plate d, 8 is steel plate e, 9 is limiting plate, 10 is nut, 11 is guide shaft, 12 is L-type permanent magnet fixed head, 13 is permanent magnet, 14 is conductor copper coin, 15 is TMD main body, 16 for supporting magnet, 17 is lifting gear, 18 is knob, 19 is bolt, 20 is angle steel, 21 is guide shaft hole, 22 is steel plate chamber, 23 is bolt hole, 24 is bolt of long stem, 25 is linear bearing, 26 is screw, 27 is railing, 28 is that TMD is overall, 29 is outer rigid cap, 30 pedestrian overcrossing main bodys, 31 is triangle support.

Detailed description of the invention

Embodiment 1: composition graphs 1-Figure 13, a kind of assembling eddy current tuned mass damper, comprise lower shoe 1, TMD main body 15 and frequency modulation device, TMD main body 15 is sleeved on the guide shaft 11 that is fixed on lower shoe 1, TMD main body 15 is supported by the helical compression spring 3 be sleeved on guide shaft 11, guide shaft 11 top is provided with limiting plate 9, establish in the below of TMD main body 15 and be at least equipped with two frequency modulation devices, described TMD main body 15 has stacked five steel plate a4, a slice steel plate b5, a slice steel plate c6, a slice steel plate d7 and a slice steel plate e8 from bottom to top successively; The middle part of steel plate a4, steel plate b5 forms the steel plate chamber 22 of rectangle; The middle part of steel plate c6 is reserved with the breach installing L-type permanent magnet fixed head 12; L-type permanent magnet fixed head 12 is provided with permanent magnet 13, and permanent magnet 13 is positioned at steel plate chamber 22; Be provided with conductor copper coin 14 between two L-type permanent magnet fixed heads 12 in steel plate chamber 22, conductor copper coin 14 is fixedly mounted on lower shoe 1; Linear bearing 25 is provided with in the guide shaft hole 21 of steel plate d7.

The one of described permanent magnet 13 is preferably cuboid, and on same L-type permanent magnet fixed head 12, permanent magnet 13 is arranged with magnetic pole, and on Different L type permanent magnet fixed head 12, permanent magnet 13 different pole is arranged.Between permanent magnet 13 on same L-type permanent magnet fixed head 12, net level length is 0.4 ~ 0.6 times of the permanent magnet length of side, and vertical clear distance is 0.8 ~ 1.2 times of the permanent magnet length of side.The manomelia of L-type permanent magnet fixed head 12 is fixed on the reserved notch of steel plate b5, in the square plate chamber 22 that long limb is close to steel plate a4, steel plate b5 surrounds by screw 26.

Described frequency modulation device comprises lifting gear 17, be fixed on support magnet 16 above lifting gear 17, and is used for adjusting the knob 18 of lifting gear.Described conductor copper coin 14 lower end perforate is gripped by two blocks of angle steel 20, and two blocks of angle steel 20 are connected by bolt 19 with lower shoe 1 respectively.

Bolt hole 23 place of steel plate d7 has big hole, is provided with linear bearing 25 in big hole hole.The perforate of steel plate e8, slightly larger than guide shaft 11 diameter, is pressed on linear bearing 25, prevents linear bearing 25 from skidding off from steel plate d7.

The preparation method of described assembling eddy current tuned mass damper, this preparation method comprises method for designing and assembly method, it is characterized in that: described method for designing comprises the following steps:

Step one: according to the design parameters of pedestrian overcrossing, set up FEM (finite element) model, obtains the single order vertical motion frequency f of pedestrian overcrossing ₀with modal mass m ^*;

Step 2: the tuning quality and the modal mass m that determine TMD ^*ratio μ, 1% < μ < 5%;

Step 3: according to optimal frequency ratios and Optimal damping ratio determine TMD design frequency f _d=α _opt× f ₀, damping ratio ξ _d=ξ _opt;

Step 4: according to 1. TMD tuning quality m _d=μ × m ^*, 2. TMD design rigidity k _d=m _d× (2 π f _d) ², 3. TMD design damped coefficient c _d=2m _d× 2 π f _d× ξ _d, determine the physical parameter of TMD;

Step 5: the design of TMD rigidity: vertical TMD stiffness elements adopts helical compression spring, and have 2, global design principle is rigidity bigger than normalization, and namely spring global stiffness is more than 1.1 times of TMD target design rigidity, for subsequent frequencies lowers reserved necessary space; The rigidimeter formula of helical compression spring is:

$K_s=\frac{{\mathrm{Gd}}^4}{8D^{3}n}$

In formula:

G represents the modulus of shearing of spring steel;

D represents the central diameter of spring;

N represents the number of active coils of spring;

D represents the wire diameter of spring wire, and

Wherein, F represents the load of spring, i.e. the tuning quality block deadweight of TMD;

What C represented stage clip curls up ratio, C=D/d, generally gets 5 ~ 8;

κ represents the curvature correction factor of circular section spring wire,

[τ] represents the allowable shear stress of spring wire;

Step 6: the preliminary design of TMD damping: the model of first selected permanent magnet and size, by the main magnetic induction intensity at Magnetic finite element software preresearch estimates conductor copper coin place, then according to the formula c=β σ δ SB of eddy-current damping coefficient ²determine the size of conductor copper coin;

In formula:

β represents nondimensional experience reduction coefficient, preferably gets 0.8;

σ represents the electrical conductivity of conductor;

δ represents the thickness of conductor plate;

S represents amassing by magnetic surface of conductor plate, gets the area sum that magnetizes of permanent magnet during calculating;

B represents the main magnetic induction intensity of conductor plate position, namely along the magnetic induction intensity of permanent magnet magnetizing direction;

Step 7: the detailed design of TMD damping: adopt Finite Element Magnetic Field Analysis software to carry out the Optimize magnetic circult of TMD, to determine the concrete structure of eddy current damper, mainly comprise: the level interval between permanent magnet, vertical spacing, the spacing of permanent magnet and conductor copper coin;

Step 8: according to the calculating of step one to step 7, determine TMD final design parameter.

The assembly method of the preparation method of described assembling eddy current tuned mass damper comprises the following steps:

Then two guide shafts 11 are passed the spring collar 2 and lower shoe 1, are fastened on lower shoe 1 by step 1: adopt the bolt fixing spring collar 2 at lower shoe 1 correspondence position;

Step 2: at conductor copper coin 14 bear, adopts the angle steel 20 be connected with lower shoe 1 bolt 19 to be fixed in the middle part of lower shoe 1 along lower shoe 1 length direction;

Step 3: helical compression spring 3 is through guide shaft 11, and lower end is enclosed within the spring collar 2;

Step 4: permanent magnet 13 with holes for center is bolted on outside L-type permanent magnet fixed head 12;

Step 5: below interim installation tuning quality block, middle part has steel plate a4, the steel plate b5 of notch;

Step 6: assemble in step 4 two pieces of long limbs of L-type permanent magnet fixed head 12 are arranged on conductor copper coin 14 both sides in the steel plate chamber 22 of steel plate a4, steel plate b5 respectively, its manomelia is fixed on notch reserved on steel plate b5 by screw 26;

Step 7: stay circular hole place to install linear bearing 25 at steel plate d7;

Step 8: install steel plate c6 and the steel plate d7 with linear bearing 25 successively above steel plate b5, and the steel plate e8 that the top prevents linear bearing 25 from skidding off;

Step 9: install bolt of long stem 24 and steel plate a4 ~ steel plate e8 is connected into entirety;

Step 10: the limiting plate 9 installing the top.

Embodiment 2: composition graphs 1-Figure 13, the utility model comprises lower shoe 1, be fastened on the guide shaft 11 on lower shoe, through the spring collar 2 of guide shaft, helical compression spring 3, steel plate a4 ~ steel plate e8 and limiting plate 9, the nut 10 of fixing limiting plate, be limited in the L-type permanent magnet fixed head 12 in steel plate chamber 22, be fixed by bolts to the permanent magnet 13 on L-type permanent magnet fixed head 12, be fastened on the conductor copper coin 14 of lower shoe 1 and attached frequency modulation device in the middle of two L-type permanent magnet fixed heads 12.In whole device, steel plate a4 ~ steel plate e8 forms the tuning quality of TMD, and helical compression spring 3 provides the rigidity of TMD, and permanent magnet 13 provides the damping of TMD together with conductor copper coin 14.

Elevation and subsidence mechanical on base plate adopts fairly simple scissor-type, its top fixed support magnet 16.When needing frequency modulation, rotatable knob, by the pinion rotation on knob, make two cut limb in opposite directions or from, drive permanent magnet to raise or reduce, reduce to reach or increase the object of frequency.This device is easy to install, and is convenient to continuous adjustment.Steel plate a4 ~ steel plate e8 is different, and the square hollow part 22 of steel plate a4, steel plate b5 and steel plate c6 constitutes the chamber residing for TMD damping portion, and circular hollow 21 diameter is comparatively large, so that install helical compression spring 3; Steel plate d7 installs linear bearing 25, is covered by steel plate chamber 22; Steel plate e8 fastens linear bearing 25, prevents linear bearing 25 from coming off.Whole sheet steel sections is connected for overall by bolt of long stem 24, makes whole sheet steel sections become the tuning quality of TMD.

When steel plate a4 ~ steel plate e8 is because of pedestrian bridge vertical motion during up and down reciprocatingly straight-line oscillation, cause rectangle permanent magnet 13 vertical motion be fixed on L-type permanent magnet fixed head 12, will produce the eddy-current damping suppressing steel plate a4 ~ steel plate e8 relative motion in conductor copper coin 14, the thermal energy consumption gradated as eddy current damper is fallen by the Vertical Vibration Energy of pedestrian bridge.In frequency regulation arrangement, support magnet 16 attracting with the steel plate a4 ~ steel plate e8 serving as tuning quality, when making to vibrate, the deflection of helical compression spring 3 is larger, and TMD rigidity diminishes, and namely TMD frequency reduces.Support magnet 16 the closer to steel plate, the decrease of frequency is larger.

A large amount of bridge machinery experiment shows: for pedestrian bridge, frequency is more than 4Hz, and vibration problem is not obvious, can ignore.Now intending an intrinsic frequency is 4.0Hz, and the single span freely-supported steel work pedestrian bridge of modal mass 32t carries out TMD design and optimization.

The design example of TMD

Design this pedestrian bridge and install TMD, step is as follows:

(1) the ratio μ of selected TMD tuning quality and vibration damping mode generalized mass, general 1%< μ <5%.1.5% is got for this routine described TMD mass ratio μ.

(2) according to external load type and vibration damping respond style, optimal frequency ratios is determined and Optimal damping ratio and calculate the design frequency f of TMD _d=α _opt× f ₀.Pedestrian bridge-TMD system optimal frequency ratio pedestrian overcrossing single order vertical motion frequency is 4.0Hz, then the design frequency of TMD is f _d=α _opt× f ₀=3.94Hz; Optimal damping ratio is

(3) physical parameter of TMD is calculated:

TMD tuning quality m _d=μ × m ^*=480kg.Adopt MTMD thought across pedestrian overcrossing greatly for this, namely design two TMD, then corresponding separate unit TMD movable mass is 240kg.

TMD design rigidity k _d=m _d× (2 π f _d) ²=147083.3N/m.

TMD designs damped coefficient c _d=2m _d× 2 π f _d× ξ _d=884.08Ns/m.

(4) rigidity Design:

Design rigidity k _d=m _d× (2 π f _d) ²=147083.3N/m.Consider spring loss of rigidity in reality processing and work, design rigidity gets 150KN/m.

Vertical TMD stiffness elements is intended adopting traditional helical compression spring (two), single stage clip stiffness K _s=75kN/m.According to the design discipline of stage clip, first need the wire diameter d estimating spring wire, its demand fulfillment:

$d\&GreaterEqual;\sqrt{\frac{8FC\mathrm{\&kappa;}}{\mathrm{\&pi;}\&lsqb;\mathrm{\&tau;}\&rsqb;}}$

Wherein: F represents the load of spring, every root spring load gets 120kg; What C represented stage clip curls up ratio, C=D/d, and generally get 5 ~ 8, in this example, C gets 7.5; κ represents the curvature correction factor of circular section spring wire, [τ] represents the allowable shear stress of spring wire, according to carbon spring steel wires C level, after wire diameter d is greater than 7mm, and [τ] minimum value σ _bbe about 1320MPa.By I class, (load cycle number of times is greater than 10 to spring load ⁶secondary) design time, corresponding [τ] value is 0.30 σ _b~ 0.38 σ _b, be conservatively taken as minimum value 0.30 σ herein _b, i.e. 396MPa.Final d >=8.24mm, according to current material, steel spring wire diameter d is finally taken as 11mm, then in steel spring through D=Cd=83mm.

The rigidimeter formula of spring is:

$K_s=\frac{{\mathrm{Gd}}^4}{8D^{3}n}$

Wherein, G is the modulus of shearing of spring steel, gets 79GPa; N represents the number of active coils of spring.

According to the stiffness factor desired value 75kN/m of spring, can be 3.43 in the hope of number of active coils n, then number of active coils gets 1/2 circle be 3.5, and number of total coils is 5.5.The practical stiffness 73.57kN/m of corresponding steel spring can be obtained fom the above equation, theoretical static compression amount is 16.0mm.Spring final size is: wire diameter 11mm, central diameter 83mm, pitch 63mm, and number of active coils 3.5 encloses, overall length 246mm.

(5) damping design

Eddy-current damping described herein selects N40 type NdFeB permanent magnet.Adopt Tesla meter measured distance permanent magnet surface 5mm place (conductor copper coin and permanent magnet clear spacing 5mm) main magnetic induction density B (along the direction of magnetization of magnet, and vertical with the direction of relative movement of conductor), the average calculating multiple spot is about 0.3T.

Current vortex TMD initial designs damping ratio is 7.44%, the frictional damping in deduction vibration processes on guide shaft, TMD model machine eddy-current damping with 5.0% for design object, eddy-current damping c _d=2m _d× 2 π f _d× ξ _d=593.84Ns/m, conductive copper plate thickness selects 10mm (electrical conductivity 5.6 × 10 ⁷s/m), according to formula c=β σ δ SB ²the rectangle permanent magnet magnetized surface calculated now amasss as 0.0147m ².According to permanent magnet product specification N40, tentatively select length to be respectively 50mm, 50mm, 25mm, monolithic L-type permanent magnet fixed head arranges 6 pieces altogether, then permanent magnet magnetized surface amasss as 0.015m ².

(6) Optimize magnetic circult: determine that the horizontal clear spacing between two blocks of rectangle permanent magnets is 2cm, vertical spacing is 10cm, gapped magnetic field (conductor copper coin and permanent magnet clear distance) 5mm.

(7) debug: the utility model designs according to above-mentioned parameter and installed a TMD, and tests.The frequency recording designed TMD is 4.10Hz, and damping ratio is 5.04.Compared to design object, TMD frequency and damping ratio are all within the scope of allowable error.For reaching designing requirement, carry out frequency trim by attached frequency modulation device.Elevation and subsidence mechanical is fixed on lower shoe, and installation fixes permanent magnet, constantly regulates permanent magnet height (the tuning quality steel plate to TMD is close), until by frequency adjustment to 3.94Hz by knob.

(8) concrete installation steps: in span centre position, railing is blocked a part, install triangle support 31 bottom railing 27.TMD lower shoe 1 chemical bolt being fastened with guide shaft 11 is anchored at bottom railing 27, adopts the bolt fixing spring collar 2 at lower shoe 1 correspondence position, then two guide shafts 11 are passed the spring collar 2 and lower shoe 1, be fixed on lower shoe 1; Conductor copper coin 14 bear, adopts along lower shoe 1 length direction and is fixed in the middle part of lower shoe 1 as Fig. 4 with the bolted angle steel 20 of lower shoe 1; Helical compression spring 3 is through guide shaft 11, and one end is enclosed within the spring collar 2.Then, permanent magnet 13 with holes for center is bolted on outside L-type permanent magnet fixed head 12, on two block permanent magnet fixed heads 12 permanent magnet 13 position identical (permanent magnet fixed head is boxed out in same position in advance) is installed, polarity is contrary, and on same plate, permanent magnet polarity is identical.Then, middle part below tuning quality block is installed and has steel plate a4, the steel plate b5 of notch; Then assemble two pieces of L-type permanent magnet fixed heads 12 are arranged on conductor copper coin 14 both sides in steel plate a4, steel plate b5 notch respectively, L-type permanent magnet fixed head 12 manomelia is fixed on steel plate b5 by screw 26.Next, stay circular hole place that linear bearing 25 is installed at top steel plate d7, then steel plate c6 and the steel plate d7 with linear bearing is installed above steel plate b5 successively, and the steel plate e8 that the top prevents linear bearing 25 from skidding off; Finally by bolt of long stem 24, steel plate a4 ~ steel plate e8 is connected into entirety, spacing steel plate 9 and the nut 10 of the top are installed.Suitable brush machine oil or lubrication oil in each several part installation process.After all installing, integral rigidity outer cover is installed, keeps the attractive in appearance of bridge.

Claims (9)

1. an assembling eddy current tuned mass damper, comprise lower shoe (1), TMD main body (15) and frequency modulation device, TMD main body (15) is sleeved on the guide shaft (11) that is fixed on lower shoe (1), TMD main body (15) is supported by the helical compression spring (3) be sleeved on guide shaft (11), guide shaft (11) top is provided with limiting plate (9), establish in the below of TMD main body (15) and be at least equipped with two frequency modulation devices, it is characterized in that: described TMD main body (15) has stacked five steel plate a(4 from bottom to top successively), a slice steel plate b(5), a slice steel plate c(6), a slice steel plate d(7) and a slice steel plate e(8), the middle part of steel plate a, b forms the steel plate chamber (22) of rectangle, steel plate c(6) middle part be reserved with install L-type permanent magnet fixed head (12) breach, L-type permanent magnet fixed head (12) is provided with permanent magnet (13), permanent magnet (13) is positioned at steel plate chamber (22), be provided with conductor copper coin (14) between two L-type permanent magnet fixed heads (12) in steel plate chamber (22), conductor copper coin (14) is fixedly mounted on lower shoe (1), at steel plate d(7) guide shaft hole (21) in be provided with linear bearing (25).

2. assembling eddy current tuned mass damper according to claim 1, it is characterized in that: the one of described permanent magnet (13) is preferably cuboid, the upper permanent magnet (13) of same L-type permanent magnet fixed head (12) is arranged with magnetic pole, and upper permanent magnet (13) different pole of Different L type permanent magnet fixed head (12) is arranged.

3. assembling eddy current tuned mass damper according to claim 2, it is characterized in that: between the permanent magnet (13) on same L-type permanent magnet fixed head (12), net level length is 0.4 ~ 0.6 times of permanent magnet (13) length of side, and vertical clear distance is 0.8 ~ 1.2 times of permanent magnet (13) length of side.

4. assembling eddy current tuned mass damper according to claim 1, it is characterized in that: described frequency modulation device comprises lifting gear (17), be fixed on the support magnet (16) of lifting gear (17) top, and be used for adjusting the knob (18) of lifting gear.

5. assembling eddy current tuned mass damper according to claim 1, it is characterized in that: the manomelia of described L-type permanent magnet fixed head (12) is fixed on steel plate b(5 by screw (26)) on reserved notch, long limb is close to steel plate a, b(4,5) in the square plate chamber (22) that surrounds.

6. assembling eddy current tuned mass damper according to claim 1, it is characterized in that: the lower end perforate of described conductor copper coin (14) is gripped by two pieces of angle steel (20), and two pieces of angle steel (20) are connected by bolt (19) with lower shoe (1) respectively.

7. assembling eddy current tuned mass damper according to claim 1, is characterized in that: described steel plate d(7) guide shaft hole (21) place have big hole, linear bearing (25) is installed in big hole hole.

8. assembling eddy current tuned mass damper according to claim 1, it is characterized in that: described steel plate e(8) guide shaft hole (21) perforate slightly larger than guide shaft (11) diameter, be pressed on linear bearing (25), prevent linear bearing (25) from steel plate d(7) skid off.

9. assembling eddy current tuned mass damper according to claim 1, it is characterized in that: described assembling eddy current tuned mass damper, described steel plate a(4), steel plate b(5), steel plate c(6), steel plate d(7) with steel plate e(8) equal prepared screw-bolt holes (23), be connected by bolt of long stem (24).