CN105839513A - Damping device and method for medium-low-speed magnetic levitation turnout beam - Google Patents

Abstract

The invention discloses a damping and noise reduction device for a medium-low-speed magnetic levitation turnout beam. The device comprises an embedded board arranged on a bottom flange of the turnout beam and multiple tuning mass dampers installed on the embedded board. Each tuning mass damper comprises a main vibration system and a container provided with a built-in tuning damper. The containers are filled with damping liquid. Through adjustment of the mass, the rigidity and the damping coefficient parameters of a tuning damping mechanism and adjustment of the size of the containers and the depths of the damping liquid in the containers, the tuning damping mechanism can meet a mass tuning condition and a liquid tuning condition, mass tuning and liquid tuning are achieved, and therefore damping and noise reduction of the turnout beam are achieved. The invention further discloses a corresponding damping and noise reduction method. By the adoption of the device and method, on the premise that it is guaranteed that the turnout beam rotates in place within the required time, the vertical vibration acceleration of the turnout beam can be stably reduced in a safety and comfort standard of 0.5 g for a long time, and vibration of the turnout beam is controlled.

Description

A kind of medium-and low-speed maglev turnout junction girder vibration absorber and method

Technical field

The invention belongs to medium-and low-speed maglev technical field of rail traffic, be specifically related to a kind of medium-and low-speed maglev turnout junction girder Vibration and noise reducing device and method.

Background technology

Track switch is for making rolling stock proceed to the line connection equipment of another station track from a station track in track traffic, The most AT STATION, marshalling yard lays in a large number.The track switch of medium-and low-speed maglev track traffic generally included turnout junction girder, Buttress beam, chassis, beam upper rail, driving means, locking device, movable end guide rail, electric control system, When needing lane change, receiving conversion command from track switch electric control system, railroad switch actuating device drives track switch active beam Transverse shifting, drives driven beam to move along chassis, turnout junction girder, guide rail is locked after turning to specify buttress beam alignment Determine device locking, and then realize lane change.

Magnetic-levitation train is when turnout passing, and in order to the changing points time is short, turnout junction girder design is general uses light-duty chemical industry Word steel adds diaphragm structure, and this turnout junction girder natural frequency of vibration is at 10-18Hz, and each rank natural frequency of vibration difference is less, The magnetic-levitation train natural frequency of vibration is close with the turnout junction girder natural frequency of vibration, produces resonance, and on the one hand this resonance can affect Trouble structure service life, on the other hand vibrate excessive, affect floating operation stability and the comfortableness listed of magnetic, and product Raw noise, affects environment.Therefore, it is necessary to the resonance between magnetic-levitation train and track switch is processed, reduce and Improve the covibration produced between track switch and magnetic-levitation train.

At present, solve in the industry resonance problem and change vibration characteristics mainly by changing track switch quality, such as at active beam Adding suitable sand (cobblestone) bag (case) processing means in steel box-girder, the program can improve vibration characteristics, but It is that the aspects such as its effectiveness in vibration suppression and the stability continuing vibration damping still suffer from deficiency, is mainly reflected in following two side Face:

1) it is difficult to reach expection vibration damping target

Middle low speed turnout junction girder is designed with lightness I-steel and adds diaphragm structure, and turnout junction girder weight is about 247KN, 11KW motor can be met and rotate in place in 15s, add sand (cobblestone) bag (case) at active beam two span centre Increase track switch quality and change vibration characteristics, sand (cobblestone) bag (case) quality should not too big (no more than 4000kg), Otherwise cannot meet time requirement in track switch rotates 15 seconds, and abrasive band (case) is although quality has in 4000kg Having certain effectiveness in vibration suppression, vertical motion acceleration can be reduced to about 1.0g to 1.3g by 3.3g, but is difficult to reach Vertical motion Acceleration Control is in no more than 0.5g safety and comfort standard.

2) effectiveness in vibration suppression is unstable

Add sand (cobblestone) bag (case) at active beam two span centre and change vibration characteristics, along with magnetic-levitation train repeatedly After operation, worse and worse, when this is primarily due to just be open to traffic, sand (cobblestone) is loose for its effectiveness in vibration suppression, Having certain damping action, along with train is run multiple times vibration, sand (cobblestone) becomes closely knit, and it damps work With more and more less, the most only mass action, effectiveness in vibration suppression worse and worse, its vibration damping poor stability.

Summary of the invention

For disadvantages described above or the Improvement requirement of prior art, the invention provides a kind of for medium-and low-speed maglev road The vibration and noise reducing device of Cha Liang and method, it organizes tuned mass damper by arranging in steel case turnout junction girder more, By the vibration of movable mass block in the vibrational energy transfer of turnout junction girder to tuned mass damper, meet guaranteeing Cha Liang rotate in place under premise at the appointed time, can be reduced to steadily in the long term by turnout junction girder vertical motion acceleration In the safety and comfort standard of 0.5g, it is achieved the control to turnout junction girder vibration.

For achieving the above object, according to one aspect of the present invention, it is provided that a kind of for medium-and low-speed maglev turnout junction girder Vibration and noise reducing device, it is characterised in that this device includes:

It is arranged on the embedded board on turnout junction girder bottom flange；

The multiple tuned mass dampers being fixedly mounted on this embedded board；

Wherein, described tuned mass damper includes principal oscillation system, and this principal oscillation system is provided with built-in tune The container of humorous antivibrator, has been filled with damping fluid in this container, by regulation the tuning quality of damping mechanism, rigidity And damped coefficient, and adjust size and the degree of depth of internal damping liquid thereof of described container so that it is meet quality respectively Tuning and tunable liquid condition, make the vibrational energy of turnout junction girder can be transferred to the vibration of movable mass block in this way, And by the vibrational energy of damping fluid dissipation movable mass block, reach mass tuning and tunable liquid, and then realize Vibration and noise reducing to turnout junction girder.

As present invention further optimization, described tuned mass damper is more than four groups.

As present invention further optimization, the described tuned mass damper of each group is symmetrically distributed in turnout junction girder.

As present invention further optimization, often organize described tuned mass damper and include three to six Tuned mass dampers Device, is transversely evenly arranged along turnout junction girder.

As present invention further optimization, the damping ratio often organizing described tuned mass damper is 0.1, and frequency is excellent In the range of being selected in 16.56-17.56.

As present invention further optimization, the quality often organizing described tuned mass damper is 45-55kg.

In the present invention, middle low speed turnout junction girder Tuned mass damper system (TMD, Tuned Mass Damper) It is the frequency by regulating self, in tuning range, by movable in the vibrational energy transfer of turnout junction girder to TMD The vibration of mass, the damping unit in TMD can the vibrational energy of abundant dissipation movable mass block, to reach control The purpose of turnout junction girder processed vibration.

The present invention, by installing many group TMD tuned mass dampers in active beam, increases damping value, Ke Yi great Width reduces vibratory response.

It is another aspect of this invention to provide that provide a kind of vibration and noise reducing method for medium-and low-speed maglev turnout junction girder, It is characterized in that, the method includes:

Turnout junction girder bottom flange arranges embedded board；

This embedded board fixedly mounts multiple tuned mass damper, wherein, described tuned mass damper bag Include principal oscillation system, this principal oscillation system is provided with the container of built-in tuned damper, has been filled with in this container Damping fluid；

The regulation tuning quality of damping mechanism, rigidity and damped coefficient parameter, and adjust the size of described container And the degree of depth of internal damping liquid so that it is meet mass tuning and tunable liquid condition respectively, so that turnout junction girder Vibrational energy be transferred to the vibration of movable mass block, the vibrational energy of damping fluid dissipation movable mass block, reach To mass tuning and tunable liquid, and then realize the vibration and noise reducing to turnout junction girder.

As present invention further optimization, described tuned mass damper is more than four groups.

As present invention further optimization, the described tuned mass damper of each group is symmetrically distributed in turnout junction girder.

As present invention further optimization, often organize described tuned mass damper and include three to six Tuned mass dampers Device, is transversely evenly arranged along turnout junction girder.

In general, by the contemplated above technical scheme of the present invention compared with prior art, have and following have Benefit effect:

(1) present invention arranges in principal oscillation system damping mass block further, and mass is put simultaneously In damping fluid, by frequency and the damping parameter of damping fluid of regulation mass so that during mass motion Promotion damping fluid moves, and i.e. by quality and liquid double tunning, utilizes the coupling of fluid and solid simultaneously, When substantially reducing vibration absorber volume, the parameter adjustment not only making whole vibration absorber is convenient, And make its effectiveness in vibration suppression more preferably；

(2) in the present invention, after installing antivibrator, track switch quality only increases 1200kg, meets 15s rotation time and wants Asking, turnout junction girder vertical motion acceleration is reduced in 0.5g safety and comfort standard, and vibration damping is steady in a long-term.

Accompanying drawing explanation

Fig. 1 is the principle schematic of the vibration absorber of the present invention；

Fig. 2 is across active beam mounting structure according to TMD in the vibration absorber of one embodiment of the invention and 1 Schematic diagram；

Fig. 3 (a) is the facade structures schematic diagram that in the vibration absorber in Fig. 2, TMD and 1 installs across active beam； 3 (b) is the planar structure schematic diagram that TMD and 1 installs across active beam；3 (c) is that TMD and 1 installs across active beam Side structure schematic diagram.

Detailed description of the invention

In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and enforcement Example, is further elaborated to the present invention.Should be appreciated that specific embodiment described herein is only used To explain the present invention, it is not intended to limit the present invention.Additionally, each embodiment of invention described below As long as technical characteristic involved in does not constitutes conflict each other and just can be mutually combined.

According to a preferred embodiment of the invention damping device structure as illustrated in fig. 1 and 2, subtracting of this embodiment Vibrating device includes organizing tuned mass damper more, and turnout junction girder both sides I-steel bottom flange welds certain thickness (example Such as 24mm) embedded board, fix with embedded board with bolt bottom tuned mass damper.

In one embodiment, whole group of track switch active beam two across, be often preferably four groups across antivibrator, often organize damping Device preferably includes three antivibrators being arranged in juxtaposition, preferably along the laterally homogeneous layout of turnout junction girder.Certainly the present invention In the group number of antivibrator is not limited to this, can be selected by model analysis as the case may be.

Owing to TMD antivibrator is for the sensitivity of frequency, for the TMD of single frequency, controlled frequency Rate scope is narrower, and once beyond the frequency departure controllable frequency scope of main structure, controlling effect can have a greatly reduced quality. Float the vibration damping project of engineering turnout junction girder for magnetic for, turnout junction girder lighter weight, can be to turnout junction girder when train passes through Frequency produce impact, and passenger is many causes this influence degree different at least, therefore, operation this turnout junction girder of phase Actual frequency are not fixed, therefore take the mode of multiple tuning quality liquid double tunning antivibrator (TLMD) to enter it Row vibration control.

It practice, middle low speed turnout junction girder controls vibration has a following two feature: 1) controlled frequency is up to 18Hz. Turnout junction girder has the predominant oscillatory frequencies of car state to be 18Hz, and after this frequency Train leaves, track switch vibration of beam declines Subtracting the persistent period the shortest, therefore TMD major control has car state (i.e. controlled frequency is 18Hz)；2) track switch The idling frequency of beam is with to have car frequency phase-difference very big, and has car frequency to change along with the mass change of car body.Cause This uses many class frequencys distributed MTMD antivibrator to carry out vibration control.

Antivibrator operation principle is shown in Fig. 1, is M in quality, and rigidity is K, and damped coefficient is the principal oscillation system of C On system, arranging the container of a built-in tuned mass damper, in container, the quality of tuned mass damper is m, Rigidity is k, and damped coefficient is c, and regulation quality m of Tuned mass damper mechanism, rigidity k, damped coefficient c etc. join Number so that it is meet mass tuning condition, to reach the effectiveness in vibration suppression of mass tuning.Meanwhile, it is filled with in container Damping fluid, by adjusting container dimensional and the degree of depth of internal damping liquid thereof so that it is meet tunable liquid condition, to reach Effectiveness in vibration suppression to tunable liquid.Owing to promoting damping fluid motion when mass m moves so that it is wave amplitude is bigger, It is more beneficial for it to absorb and the energy of the principal oscillation system that dissipates, i.e. by quality and liquid double tunning, utilizes simultaneously Fluid and the coupling of solid, when substantially reducing vibration absorber volume, not only make whole vibration damping fill The parameter adjustment put is convenient, and makes its effectiveness in vibration suppression more preferably.

In Fig. 1, antivibrator kinetics equation is:

$\left\{\begin{array}{c}M\stackrel{\·\·}{y}+C\stackrel{\·}{y}+Ky=p\left(t\right)+\underset{i=1}{\overset{n}{\Σ}}\[c_d^i({\stackrel{\·}{y}}_d^i-{\stackrel{\·}{y}}_A^i)+k_d^i(y_d^i-y_A^i)\]\\ m_d^i{\stackrel{\·\·}{y}}_d^i+c_d^i({\stackrel{\·}{y}}_d^i-{\stackrel{\·}{y}}_A^i)+k_d^i(y_d^i-y_A^i)=0,(i=1,\mathrm{...},n)\end{array}\right.$

In formula:

The quality coefficient of M, C, K main structure, damped coefficient and stiffness coefficient；P (t) main structure is subject to Dynamic excitation；The displacement of y main structure；The quality coefficient of i-th TMD, damped coefficient and Stiffness coefficient；The displacement of i-th TMD；I-th TMD and the displacement of main structure junction.

Above-mentioned vibrational system is carried out moda1 decomposition, obtains its modal equations:

$\left\{\begin{array}{c}(1+\underset{i=1}{\overset{n}{\Σ}}{\mathrm{\μ}}_k^i{{\mathrm{\φ}}_{kA}^i}^2){\stackrel{\·\·}{q}}_k+\underset{i=1}{\overset{n}{\Σ}}{\mathrm{\μ}}_k^i{\mathrm{\φ}}_{k4}^i{\stackrel{\·\·}{\mathrm{\γ}}}_k+2{\mathrm{\ζ}}_k{\mathrm{\ω}}_k{\stackrel{\·}{q}}_k+{{\mathrm{\ω}}_k}^2{q}_k=F_k\left(t\right)/m_k\\ {\stackrel{\·\·}{\mathrm{\γ}}}_k^i+{\mathrm{\φ}}_{kA}^i{\stackrel{\·\·}{q}}_k+2{\mathrm{\ζ}}_d^i{\mathrm{\ω}}_d^i{\stackrel{\·}{\mathrm{\γ}}}_k^i+{{\mathrm{\ω}}_d^i}^2{\mathrm{\γ}}_k^i=0,(i=1,...,n)\end{array}\right.$

In formula: q_kMain structure kth component level is moved；γ_kThe TLMD relative displacement to structure kth order mode state； m_k、ω_k、ζ_k、F_kThe modal mass on main structure kth rank, circular frequency, modal damping and mode external force；I-th TLMD to the mass ratio of main structure kth order mode state, circular frequency, damping ratio and The vibration shape value of installed position main structure.

Aiming at of multiple target satisfaction control theory, when mass ratio one timing of multiple TMD, main structure (road Cha Liang) the power augmentation multiple with TMD all takes minima.

In one embodiment, by optimizing, the parameters optimization arranging four groups of TMD is as shown in the table.

Under this parameter, the power augmentation multiple maximum of active beam is 6.37.

After turnout junction girder is by installing TMD, vertical motion acceleration is reduced to 0.5g by 3.3g when not installing TMD In safety and comfort standard, and can be steady in a long-term, after installing antivibrator, track switch quality only increases 1200kg, meets 15s Rotation time requirement.

It addition, the damping fluid in antivibrator in addition to providing damping that is stable and that be easy to regulation to whole vibration absorber, The each component returning vibration absorber provides anti-corrosion environment, extends whole vibration absorber service life, and reduces complete The integrated cost of validity period.

As it will be easily appreciated by one skilled in the art that and the foregoing is only presently preferred embodiments of the present invention, not In order to limit the present invention, all any amendment, equivalents made within the spirit and principles in the present invention and changing Enter, should be included within the scope of the present invention.

Claims (10)

1. the vibration and noise reducing device for medium-and low-speed maglev turnout junction girder, it is characterised in that this device includes:

It is arranged on the embedded board on turnout junction girder bottom flange；

The multiple tuned mass dampers being fixedly mounted on this embedded board；

Wherein, described tuned mass damper includes principal oscillation system, and this principal oscillation system is provided with built-in tune The container of humorous antivibrator, has been filled with damping fluid in this container, by regulation the tuning quality of damping mechanism, rigidity And damped coefficient, and adjust size and the degree of depth of internal damping liquid thereof of described container so that it is meet quality respectively Tuning and tunable liquid condition, make the vibrational energy of turnout junction girder can be transferred to the vibration of movable mass block in this way, And by the vibrational energy of damping fluid dissipation movable mass block, reach mass tuning and tunable liquid, and then realize Vibration and noise reducing to turnout junction girder.

Vibration and noise reducing device for medium-and low-speed maglev turnout junction girder the most according to claim 1, wherein, institute Stating tuned mass damper is more than four groups.

Vibration and noise reducing device for medium-and low-speed maglev turnout junction girder the most according to claim 1 and 2, wherein, The described tuned mass damper of each group is symmetrically distributed in turnout junction girder.

Vibration and noise reducing device for medium-and low-speed maglev turnout junction girder the most according to claim 3, wherein, often Organize described tuned mass damper and include three to six mass dampers, be transversely evenly arranged along turnout junction girder.

5. according to the vibration and noise reducing device for medium-and low-speed maglev turnout junction girder according to any one of claim 1-4, Wherein, the damping ratio often organizing described tuned mass damper is 0.1, and frequency is preferably in the range of 16.56-17.56.

6. according to the vibration and noise reducing device for medium-and low-speed maglev turnout junction girder according to any one of claim 1-4, Wherein, the quality often organizing described tuned mass damper is 45-55kg.

7. the vibration and noise reducing method for medium-and low-speed maglev turnout junction girder, it is characterised in that the method includes:

Turnout junction girder bottom flange arranges embedded board；

This embedded board fixedly mounts multiple tuned mass damper, wherein, described tuned mass damper bag Include principal oscillation system, this principal oscillation system is provided with the container of built-in tuned damper, has been filled with in this container Damping fluid；

The regulation tuning quality of damping mechanism, rigidity and damped coefficient parameter, and adjust the size of described container And the degree of depth of internal damping liquid so that it is meet mass tuning and tunable liquid condition respectively, so that turnout junction girder Vibrational energy be transferred to the vibration of movable mass block, the vibrational energy of damping fluid dissipation movable mass block, reach To mass tuning and tunable liquid, and then realize the vibration and noise reducing to turnout junction girder.

A kind of vibration and noise reducing method for medium-and low-speed maglev turnout junction girder the most according to claim 7, wherein, Described tuned mass damper is more than four groups.

9. according to a kind of vibration and noise reducing method for medium-and low-speed maglev turnout junction girder described in claim 7 or 8, Wherein, often organize described tuned mass damper and include three to six mass dampers, the most uniform along turnout junction girder Arrange.

10. fill according to the vibration and noise reducing for medium-and low-speed maglev turnout junction girder according to any one of claim 7-9 Putting, wherein, the damping ratio often organizing described tuned mass damper is 0.1, and frequency is preferably at 16.56-17.56 model In enclosing.