CN2194935Y

CN2194935Y - Mass tuned damper

Info

Publication number: CN2194935Y
Application number: CN 94237943
Authority: CN
Inventors: 顾金均; 汪正兴; 刘蓬风
Original assignee: BRIDGE SCIENCE INST BRIDGE ENGINEERING BUREAU MINISTRY OF RAILWAYS
Current assignee: BRIDGE SCIENCE INST BRIDGE ENGINEERING BUREAU MINISTRY OF RAILWAYS
Priority date: 1994-07-31
Filing date: 1994-07-31
Publication date: 1995-04-19
Anticipated expiration: 2004-07-31

Abstract

This is a mass tuned damper which restrains structural shake of the structure of rod and tower, as bridge, and can be used for mechanical shock absorption. It adopts spring steel slice to be cantilever member bar. At the side of the additional mass piece and the case body, there is set with a plastic damping structure along the direction of vibration. When the structure vibrates, the additional mass piece creates relative displacement with the structure. The relative displacement makes the damping structure to create bend and shearing deformation, and further makes the high polymer of plastic to create vibratory energy of inner friction and dissipation. This achieves partial separation of rigidity parameter and damping parameter, and makes that every parameter all can be adjusted to optimal value at the same time. So, the mass tuned damper is achieved optimal braking effect.

Description

Mass tuned damper

Rod-types such as the utility model relates to a kind of specific shock absorber, specifically a kind of inhibition bridge and king-post formula structure structure vibrate, and can be applied to the tuned mass damper of mechanical vibration damping.

The General Principle of tuned mass damper is: tuned mass damper makes principal oscillation structural vibrations energy shift to tuned mass damper as being installed in the structural additional power vibration damping device of principal oscillation.By adjusting, make the stiffness parameters of tuned mass damper and damping parameter reach optimum value, principal oscillation structural vibrations energy is shifted to tuned mass damper to greatest extent, thereby reduce the principal oscillation structural vibrations to greatest extent.The vibrational energy of tuned mass damper is then dissipated by its damping member and controls, and is unlikely to unrestrictedly to aggravate.In the prior art, a kind of rubber bar type tuned mass damper close with the utility model, only by a rubber bar as the cantilever rod member, the fixedly connected mass of one end (additional mass), the other end are held on the support and constitute.But as U.S. Bras Dor bridge rod member shake usefulness rubber bar type tuned mass damper (referring to " the aeroelasticity modern study course " U.S., E.H. Dao Er, the little Ke Disi of H.C., R.H. Si Kanlun, F. Xi Situo work; Chen Wenjun, Yin Chuanjia translates; The Yuhang Publishing House, the 192nd page-194 pages).The rubber bar of this tuned mass damper be spring member be again damping member, the stiffness parameters of damper and the adjustment of damping parameter realize by the drift of regulating rubber bar, fully so extremely difficulty makes these two parameters adjust to optimal value simultaneously; Rubber bar is subjected to the additional mass effect for a long time and produces creep, and damper is exposed outside, external environment condition such as temperature, humidity etc. will cause the variation of elastomeric material characteristic, and these all make the stiffness parameters of damper and damping parameter depart from its debugging value, reduce effectiveness in vibration suppression significantly; Because direct clamping rubber bar, the dynamics of clamping directly influences the adjustment accuracy of stiffness parameters and damping parameter, makes its poor repeatability, the dispersion ratio height.These constructional defectives make the parameter adjustment of rubber bar type tuned mass damper can not satisfy the requirement of optimal value, thereby can not reach best inhibition of vibration.

The purpose of this utility model is to overcome the defective of above-mentioned rubber bar type tuned mass damper, provide a kind of stiffness parameters and damping parameter partly to separate, stable and reliable for performance, each parameter can transfer to optimal value simultaneously, thereby can reach the tuned mass damper of best inhibition of vibration.

The purpose of this utility model is achieved in that with a rigidity box body (or stiff frame); framework as whole tuned mass damper; also play simultaneously the effect of protection tuned mass damper; replace rubber bar as the cantilever rod member with spring steel plate; to constitute the main rigidity member of tuned mass damper; then clamping or be fixed in the other end of spring steel plate of one end clamping of spring steel plate or be fixed in the holder in the rigidity box body, additional mass.By regulating the position of additional mass on spring steel plate, the perhaps position of regulating spring steel disc on holder, come the drift of regulating spring steel disc, thereby reach the purpose of quality of regulation tuned damper stiffness parameters (that is vibration frequency of tuned mass damper additional mass).Along direction of vibration the rubber damping member that damping rubber constitutes is set in additional mass and rigidity box body (or stiff frame) side, (available clamping or bonding etc. method) links to each other with additional mass the rubber damping member respectively with rigidity box body (or stiff frame).Rigidity box body (or stiff frame) is fixed on the structure that needs vibration damping, when structural vibration, additional mass and structure produce relative displacement, thereby make the rubber damping member produce bending and shear strain, and this distortion make produce between the macromolecule of rubber in friction dissipates vibration energy, thereby provide tuned mass damper required damping.In addition, the elastic deformation of rubber damping member also provides the part rigidity of tuned mass damper.By regulating shape, the size of rubber damping member, and the permanent position on additional mass and rigidity box body (or stiff frame), can reach the purpose of adjusting the tuned mass damper damping value, and then the stiffness parameters of realizing tuned mass damper can partly separate adjustment with damping parameter, reach the purpose of optimal value simultaneously, produce the best vibrating effect of drawing up.

Technique scheme compared with prior art, by rational structure design, realized that stiffness parameters separates with the part of damping parameter, solved that stiffness parameters can not separate with damping parameter in the prior art, and change the drawback that produces bigger variation with external environment condition in time, and make each parameter all can be adjusted to optimal value simultaneously, thereby make tuned mass damper can reach best inhibition of vibration.

Fig. 1 is the structure and the scheme of installation of a kind of tuned mass damper of the prior art;

Fig. 2 is the organigram of a kind of tuned mass damper of the present utility model;

Fig. 3 is that the A of Fig. 2 is to view;

Fig. 4 is the flat distribution map of tuned mass damper on suspension rod among the embodiment.

The utility model is described in further detail below in conjunction with embodiment and accompanying drawing.

Certain steel bridge root arch suspension rod, section configuration is the H type, is of a size of 720mm * 520mm, long 32m, its equivalent lumped mass ml is 3200Kg.Because of causing the crooked whirlpool of suspension rod, wind shakes, when the utility model tuned mass damper is not installed in actual measurement, and whirlpool vibration frequency that is suspension rod natural frequency fs=2.44Hz, structural damping is represented ♂ with logarithmic decrement ₀=0.008, the peak swing value Amax that crooked whirlpool shakes reaches ± 70mm.By effective mass 1.5%(is the gross mass m2=48Kg that mass ratio μ=m2/m1=1.5%) determines to be provided with tuned mass damper.According to the cross dimensions of suspension rod, do not exceed the principle of H type section outer rim by box body, 8 small-sized tuned mass dampers are set, the quality of each tuned mass damper additional mass is 6Kg.

Fig. 2, Fig. 3 are the organigram of present embodiment tuned mass damper, rubber damping member 1,2 usefulness high damping value rubber strips (as 9050A) curve open annular and constitute, additional mass 3 uses spring steel plate 4 as the cantilever rod member by two formations that are of a size of 108 * 84 * 42mm.The upper end of spring steel plate 4 is connected with rigidity box body 15 by φ 6mm

bolt

7,8,9,10,11,12,13 and 14 with bearing 5 and pressing plate 6; The

bolt

16,17,18 and 19 of additional mass 3 usefulness φ 6mm is clamped on the spring steel plate 4.The open

side pressing plate

20,21 of rubber damping member 1,2 and

press strip

22,23,24 and 25 also are pressed in the indent of additional mass 3 by

bolt

16,17,18 and 19.The opposite side of rubber damping member 1,2 is close to rigidity box body 15.Rigidity box body 15 is by 26 sealings of down inserting type tray cover.Rigidity box body 15 usefulness 2mm steel plates adopt whole punching press welding forming, play a part tuned mass damper and are not subjected to etches such as rainwater with stiff frame and the protection tuned mass damper that suspension rod directly links to each other.The box body overall dimensions are 194 * 130 * 390mm.The utilization tuned mass damper principle of optimality, tuned mass damper is optimized frequency ratio γ ^Opt=1/(1+ μ), calculate the gained optimal frequency and compare γ ^Opt=0.985, thus the optimization frequency values=fs * γ of tuned mass damper ^Opt=2.44 * 0.985=2.40Hz, optimal damper compares § ^Opt=3 μ/8(1+ μ) ³ ^1/2=0.073, optimum logarithmic decrement δ ^Opt=2 π §=0.46.Size according to rigidity box body 15, the drift of determining spring steel plate 4 is 190mm, when test of many times is determined optimal frequency and damping value, the thickness of spring steel plate 4 is 2mm, width is 22mm, the length of rubber damping member 1,2 used rubber strips, width, thickness is respectively 265mm, 30mm and 6.5mm.Test method is: tuned mass damper is installed on the debugging bearing, B﹠amp; The K8001 reluctance head is fixed in the acceleration signal that measures the mass motion on the tuned mass damper mass, through B﹠amp; Being input to the HP3562A dynamic signal analyzer after the modulation of K2626 modulated amplifier is amplified analyzes.Displacement method for releasing is just adopted in test, promptly give one of mass at the beginning of displacement discharge then, recording quality piece vibration attenuation curve directly measures the frequency values and the logarithmic decrement of mass vibration from this curve.If the frequency values that measures is high more a lot of than optimizing frequency values, then need reduces the thickness or the width of spring steel plate 4, otherwise then need increase the thickness or the width of spring steel plate 4; If logarithmic decrement is than optimal value δ ^OptHigh a lot, then should reduce the thickness of rubber damping member 1,2 used rubber strips, otherwise increase the thickness of rubber strip.When the frequency values that measures and logarithmic decrement during all near given optimal value, then can make frequency and damping more near optimal value by the drift of fine setting spring steel plate 4 and the length of fine setting rubber strip, deviation is reached allow in the debugging error.Specifically: if the higher drift that then increases spring steel plate 4 of frequency values, otherwise, reduce the drift of spring steel plate 4; If logarithmic decrement is higher, then increase rubber strip length, otherwise, reduce rubber strip length.Through adjusting, frequency values is ± 1% than the allowable variation of optimal value, and logarithmic decrement is-3%～7% than the allowable variation of optimal value, and the deviation of 8 tuned mass damper frequency values of actual debugging is ± 1%, and the deviation of logarithmic decrement only is-2%～5%.

8 tuned mass dampers of the present utility model are installed on two cross sections of upper and lower each 2m of H type suspension rod mid point with bolt, and each cross section is respectively installed 4.The layout of tuned mass damper on the suspension rod cross section as shown in Figure 4.When suspension rod vibrates, the rigidity box body 15 that is fixed on the tuned mass damper on the suspension rod vibrates with suspension rod, cause additional mass 3 generations of tuned mass damper and the relative motion between the suspension rod (that is rigidity box body 15) simultaneously, the suspension rod vibrational energy is shifted to tuned mass damper, and will cause the bending and the shear strain of rubber damping member 1,2, thereby make produce between the rubber macromolecule in friction and dissipates vibration energy.Because the frequency of all tuned mass dampers and damping value all transfer near optimal value, so make the vibrational energy of suspension rod be able to shift to tuned mass damper to greatest extent, and dissipate by tuned mass damper, thereby being shaken, the whirlpool of suspension rod suppressed fully.After the actual measurement installation quality tuned damper, the effective damping of suspension rod low order mode of flexural vibration is expressed as δ e=0.28 with logarithmic decrement, the crooked whirlpool peak swing that shakes only is ± 2mm, but the actual multiplying power of shaking reaches 35 times, the level that similar products reached in the external head and shoulders above prior art.

Claims

1, a kind of tuned mass damper, mainly by stiff frame, cantilever rod member, and additional mass formation is characterized in that: along direction of vibration, be mounted with the rubber damping member in the additional mass side.

2, tuned mass damper according to claim 1 is characterized in that: adopt spring steel plate as the cantilever rod member.

3, tuned mass damper according to claim 1 is characterized in that: the rubber damping member is formed by the bending of high damping value rubber strip.