CN112523011A - Broadband passive vibration isolator and vibration reduction method of rail system - Google Patents
Broadband passive vibration isolator and vibration reduction method of rail system Download PDFInfo
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- CN112523011A CN112523011A CN202011280489.4A CN202011280489A CN112523011A CN 112523011 A CN112523011 A CN 112523011A CN 202011280489 A CN202011280489 A CN 202011280489A CN 112523011 A CN112523011 A CN 112523011A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000009467 reduction Effects 0.000 title description 8
- 230000003321 amplification Effects 0.000 claims abstract description 19
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 19
- 238000013016 damping Methods 0.000 claims abstract description 10
- 238000007667 floating Methods 0.000 claims description 45
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- 239000011345 viscous material Substances 0.000 abstract description 4
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
- E01B19/003—Means for reducing the development or propagation of noise
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Abstract
The invention relates to the technical field of tracks, and particularly discloses a broadband passive vibration isolator and a vibration damping method of a track system, which comprise an inertia amplification assembly and a rotary viscous damper, wherein the inertia amplification assembly comprises a fixed support, a ball screw and a flywheel, the bottom of the fixed support is connected with one end of the ball screw, a ball nut is connected to the ball screw in a threaded manner, and the bottom of the flywheel is connected with the ball nut; the rotary viscous damper comprises an outer pipe and an inner pipe, wherein the inner pipe is arranged in the outer pipe, viscous materials are filled between the inner pipe and the outer pipe, a bearing is arranged in the mounting hole, and one end of the ball nut penetrates through the mounting hole to be connected with the inner pipe in the outer pipe.
Description
Technical Field
The invention relates to the technical field of rails, in particular to a broadband passive vibration isolator and a vibration reduction method of a rail system.
Background
With the rapid development of urban rail transit, the scale of subway lines in each city is continuously enlarged, and the problems of environmental vibration and noise caused by subways are increasingly prominent. At present, the best of vibration reduction effect among urban rail transit is steel spring floating slab track structure, but it still has certain limitation in practical application, and floating slab track can better keep apart medium and high frequency vibration, but is relatively poor to low frequency vibration's vibration isolation effect, and low frequency vibration can lead to the fact harmful effects to resident's life and health around the subway.
To achieve damping in the lower frequency range, there are two conventional approaches: firstly, the support rigidity is reduced, but the method can cause the vibration displacement of the track to be increased, and the running safety of the train is greatly influenced; the second method increases the quality, but increases the building space and the construction cost, and the economic benefit is greatly reduced. The contradiction of the traditional linear vibration isolation system makes the floating plate track structure unable to obtain lower initial vibration isolation frequency while providing higher bearing capacity.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a broadband passive vibration isolator and a vibration reduction method of a rail system.
The purpose of the invention is realized by the following technical scheme: a broadband passive vibration isolator comprises an inertia amplification assembly and a rotary viscous damper, wherein the inertia amplification assembly comprises a fixed support, a ball screw and a flywheel, the bottom of the fixed support is connected with one end of the ball screw, a ball nut is connected onto the ball screw in a threaded manner, the flywheel is sleeved on the ball screw, and the bottom of the flywheel is connected with the ball nut;
the rotary viscous damper comprises an outer tube and an inner tube, wherein the inner tube is arranged in the outer tube, a viscous material is filled between the inner tube and the outer tube, a mounting hole is formed in the top of the outer tube, a bearing is arranged in the mounting hole and connected with a ball nut, and one end of the ball nut penetrates through the mounting hole to be connected with the inner tube in the outer tube.
Specifically, still include fixing base and first elastic component, the upper end and the fixing base of first elastic component are connected, and the bottom is connected with fixing support.
Specifically, the bottom of outer tube is connected with the connecting seat, seals the bottom of outer tube.
Specifically, the connecting seat fix on the base, be provided with the second elastic component on the base, the top of second elastic component is provided with the upper cover, the outside at inertia subassembly and rotatory viscous damper is enlarged to the second elastic component cover.
Specifically, be provided with the barrel on the base, the second elastic component sets up in the barrel, still includes the rubber sleeve, the both ends of rubber sleeve are fixed on barrel and upper cover through the steel hoop respectively.
Specifically, the upper cover is connected with the fixed seat.
Specifically, the second elastic member and the first elastic member are both springs.
The track system comprises a floating plate, the bottom of the floating plate is provided with the broadband passive vibration isolator, and the broadband passive vibration isolator is used for reducing the vibration response of the track system in a low frequency band.
The invention has the following advantages:
1. the flexible adjustment of inertia and the adjustment of frequency can be realized, and the physical mass of the structure is basically not changed while the inertia of the structure is changed. The ball screw leads to vertical displacement after bearing, the ball nut arranged on the ball screw converts translation into rotation to drive the flywheel and the inner tube in the rotary viscous damper to rotate, so that inertia amplification and viscous damping synergy are realized, the increased inertia can not increase the vibration borne by the structure, and the contradiction between the bearing capacity and the vibration isolation performance of the traditional linear vibration isolator is reconciled.
2. The damping of any order of modes can be amplified, and the vibration isolation frequency range and the low-frequency vibration attenuation effect of the existing vibration isolator and the track system are improved while the isolation of medium-high frequency vibration is ensured.
3. As a complete dynamic system, the vibration inside the vibration isolator is not synchronous with the main structure, and the asynchronous vibration amplifies the effective deformation of the energy consumption device inside the vibration isolator, increases the energy consumption effect and further inhibits the response.
4. The installation mode of a track system and the existing floating slab type are not required to be changed, the floating slab type floating slab can be directly applied to track vibration reduction, field installation and construction are easy, and modification cost is saved.
Drawings
FIG. 1 is a schematic view of an inertial amplification unit and a rotary viscous damper according to the present invention;
FIG. 2 is a schematic view of an inertial amplification unit and a rotary viscous damper mounting structure according to the present invention;
FIG. 3 is a schematic view of the overall structure of the broadband passive vibration isolator according to the present invention;
FIG. 4 is a schematic view of the track system of the present invention;
FIG. 5 is a mechanical schematic diagram of the broadband passive vibration isolator of the present invention;
FIG. 6 is a vehicle-TVMDI floating plate track coupling dynamics system model;
FIG. 7 is a floating plate amplitude frequency curve for a front and rear track system using TVMDI;
FIG. 8 is a frequency multiplication effective value of a floating plate acceleration vibration level 1/3 of a front and rear track system applying TVMDI;
FIG. 9 is a graph of vertical rail displacement time course using a TVMDI front and rear track system;
FIG. 10 is a graph of the time course of the vertical displacement of the floating plate using the floating plate track before and after TVMDI;
in the figure: 1-a fixed seat, 2-a first elastic part, 3-a fixed support, 4-a ball screw, 5-a flywheel, 6-a ball nut, 7-a bearing, 8-an outer pipe, 9-a viscous material, 10-an inner pipe, 11-a connecting seat, 13-an upper cover, 14-a rubber sleeve, 15-a steel hoop, 16-a second elastic part, 17-a cylinder, 18-a base, 19-a broadband passive vibration isolator, 20-a track, 21-a fastener and 22-a floating plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following. As shown in fig. 1 to 3, the broadband passive vibration isolator comprises an inertia amplification assembly and a rotary viscous damper, wherein the inertia amplification assembly comprises a fixed support 3, a ball screw thread screw 4 and a flywheel 5, the bottom of the fixed support 3 is connected with one end of the ball screw thread screw 4, a ball nut 6 is connected to the ball screw thread screw 4 in a threaded manner, the flywheel 5 is sleeved on the ball screw thread screw 4, and the bottom of the flywheel 5 is connected with the ball nut 6;
the rotary viscous damper comprises an outer tube 8 and an inner tube 10, wherein the inner tube 10 is arranged in the outer tube 8, a viscous material 9 is filled between the inner tube 10 and the outer tube 8, a mounting hole is formed in the top of the outer tube 8, a bearing 7 is arranged in the mounting hole, the bearing 7 is connected with a ball nut 6, and one end of the ball nut 6 penetrates through the mounting hole to be connected with the inner tube 10 in the outer tube 8. The existing urban rail transit mostly adopts a steel spring floating plate rail structure, the floating plate rail can better isolate medium-high frequency vibration, but has poor vibration isolation effect on low frequency vibration, and the low frequency vibration can cause adverse effects on the life and health of residents around subways, the inertia amplification assembly and the rotary viscous damper in the scheme can play a good role in low frequency vibration isolation, when a train passes through, the load is transmitted to the upper cover 13 from the floating plate 22 from top to bottom, the upper cover 13 bears the load and compresses the first elastic part 2 and the second elastic part 16, the first elastic part 2 and the second elastic part 16 contract, the elastic force generated by bearing of the first elastic part 2 is transmitted to the ball screw thread screw rod 4 by the fixed support 3, the vertical displacement is generated after bearing of the ball screw thread screw rod 4, the ball nut 6 arranged on the ball screw thread screw rod 4 converts the translation screw rod into rotation, and drives the inner tube 10 in the rotary viscous damper 12 to rotate and the ball screw rod 5, the inertia amplification and viscous damping increase are realized, meanwhile, as the inertia amplification assembly is a complete dynamic system, the vibration in the system is not synchronous with the vibration of the rail system, the asynchronous vibration can amplify the effective deformation in the vibration isolator, and the energy consumption effect is increased, so that better vibration response inhibition is achieved. The inertia amplification assembly in the scheme can also adopt a gear rack mechanism, a hydraulic mechanism and an electromagnetic mechanism except for using a ball screw nut pair.
Further, still include fixing base 1 and first elastic component 2, the upper end and the fixing base 1 of first elastic component 2 are connected, and the bottom is connected with fixing support 3. The load of the vehicle is transmitted to the first elastic piece 2 through the fixed seat 1, then transmitted to the fixed support 3 through the first elastic piece 2, and then transmitted to the ball screw thread screw 4 after being damped by the first elastic piece 2.
Further, the bottom of the outer tube 8 is connected with a connecting seat 11, and the bottom of the outer tube 8 is sealed.
Further, the connecting seat 11 is fixed on the base 18, the base 18 is provided with a second elastic member 16, the top of the second elastic member 16 is provided with an upper cover 13, and the second elastic member 16 is sleeved outside the inertia amplification assembly and the rotary viscous damper.
Further, a cylinder body 17 is arranged on the base 18, the second elastic piece 16 is arranged in the cylinder body 17, the rubber sleeve 14 is further included, and two ends of the rubber sleeve 14 are respectively fixed on the cylinder body 17 and the upper cover 13 through steel hoops 15. The rubber sleeve 14 is cylindrical, the upper end of the rubber sleeve is sleeved on the excircle of the upper cover 13, the lower end of the rubber sleeve is sleeved on the cylinder 17, the cylinder 17 is in flexible connection with the upper cover 13, a space between the cylinder 17 and the upper cover 13 provides a pressing space for the upper cover 13 to avoid interference, the arranged rubber sleeve 14 can deform when the upper cover 13 is pressed down, and the upper cover 13, the rubber sleeve 14, the cylinder 17 and the base 18 form a relatively sealed space, so that an inertia amplification assembly, a rotary viscous damper and a second elastic piece 16 which are arranged inside can be protected.
Further, the upper cover 13 is connected with the fixing base 1. The force transmitted to the upper cover 13 is transmitted to the second elastic element 16 and transmitted to the first elastic element 2 through the fixed seat 1, so that vibration reduction is realized.
Further, the second elastic member 16 and the first elastic member 2 are both springs.
As shown in fig. 4; the track system vibration reduction method comprises a floating plate 22, wherein the broadband passive vibration isolator 19 is arranged at the bottom of the floating plate 22, vibration response of the track system at a low frequency band is reduced through the broadband passive vibration isolator 19, a track 20 is arranged on the floating plate 22, the track 20 is fixed on the floating plate 22 through a fastener 21, an installation cavity is arranged at the bottom of the floating plate 22, the broadband passive vibration isolator 19 is installed in the installation cavity, and the floating plate 22 is suspended through the support of the broadband passive vibration isolator 19.
Taking a common steel spring floating slab track structure in a subway line as an example, applying a broadband passive vibration isolator (TVMDI) in the invention to introduce a track system vibration damping method using the broadband passive vibration isolator, wherein the broadband passive vibration isolator and the TVMDI represent the same meaning, a mechanical schematic diagram of the broadband passive vibration isolator and the TVMDI is shown in fig. 5, an established vehicle-TVMDI floating slab track coupling dynamic system model is shown in fig. 6, and a vertical vibration equation of a floating slab 22 at the moment is as follows:
wherein:
δ is a Dirac function; efAnd IfRespectively is the elastic modulus of the floating plate and the polar moment of inertia of the section; mfAnd LfThe mass and the length of the single floating plate are respectively; esAnd IsRespectively is the elastic modulus of the base plate and the polar moment of inertia of the section; msAnd LsThe mass and length of the single base plate respectively; k is a radical ofpiAnd cpiThe stiffness and damping of the ith fastener respectively; k is a radical ofsAnd csRespectively distributing rigidity and damping along the length direction; m istg、ktgAnd ctgThe amplification factor, the rigidity and the damping of the g-th broadband passive vibration isolator are respectively obtained; zf(x, t) and
the vertical vibration displacement and the vertical vibration speed of the floating plate are respectively; zs(x, t) is the vertical vibratory displacement of the bed plate; zg、
And
respectively represents the vertical vibration displacement, the vertical vibration speed and the vertical direction of an inertial volume element in the broadband passive vibration isolatorA vibration acceleration; frfiThe support reaction force is generated by the ith fastener on the floating plate; ffsgThe support reaction force is generated by the g-th broadband passive vibration isolator under the floating plate.
The model is an integral large system formed by interaction and mutual coupling of a vehicle system and a track system, the wheel-track interaction relation is used as a link connecting the two subsystems, and in order to fully consider the dynamic influence between wheel pairs and the superposition effect of the dynamic influence on the vibration of track parts, the vertical force between the wheel tracks is calculated by applying the Herz nonlinear elastic contact theory. The expression of the vertical force between the wheel rails is as follows:
wherein G is a wheel-rail contact constant; δ z (t) is the amount of elastic compression between the wheel tracks; z0(t) is displacement irregularity.
For the nonlinear vibration differential equation with complex calculation and large operation amount, a Zhai method is adopted to carry out rapid numerical integration solution, the Zhai method is a two-step numerical integration method, and the integration format is as follows:
where Δ t denotes an integration step, and subscripts n, n-1, and n +1 denote the integration step as t ═ n Δ t time, t ═ n-1 Δ t time, and t ═ n +1 Δ t time, ψ and ψ
Is a parameter for controlling integration, and generally, the stable condition can be achieved by taking 0.5. The model assumes that the train running speed is 80km/h, the rail irregularity adopts a U.S. six-level spectrum with the wavelength of 1-30 m, the superposition wavelength is short wave irregularity with the wavelength of 0.05-1 m, and partial calculation parameters of the rail system are shown in a table 1.
TABLE 1
The maximum vertical vibratory displacement of the steel rail and the floating plate specified in the technical Specification for Floating plate track (CJJ/T191-2012) is 4mm and 3mm, respectively. The Matlab software is used for programming and calculating the coupling dynamics model, and the result is shown in fig. 7 and 8, compared with the traditional steel spring floating slab track, the acceleration vibration level of the floating slab track with the application of the broadband passive vibration isolator (TVMDI) in the frequency band of 2-10 Hz is obviously reduced, and the vibration amplification of the original steel spring floating slab track near the natural frequency of 10Hz is effectively relieved. As can be seen from fig. 9 and 10, the maximum rail displacement of the floating slab track after applying the broadband passive vibration isolator (TVMDI) is 2.88mm, which is 2.91mm smaller than the maximum rail displacement of the conventional steel spring floating slab track; the maximum displacement of the floating slab is 2.06mm, which is slightly larger than the maximum displacement of the traditional floating slab track by 2.01 mm. After the broadband passive vibration isolator (TVMDI) is applied, the maximum vertical displacement of the steel rail and the floating plate does not exceed the specified limit value. After the broadband passive vibration isolator (TVMDI) is applied, the time course curve of the wheel load shedding rate of the floating slab track is basically consistent with that of the traditional steel spring floating slab track, the maximum value of the wheel load shedding rate is slightly reduced to be 0.654 and 0.663 respectively, and the maximum value of the wheel load shedding rate does not exceed the limit value of the dynamic wheel load shedding rate of 0.9, so that the driving safety can be ensured.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make numerous possible variations and modifications to the described embodiments, or modify equivalent embodiments, without departing from the scope of the invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technology of the present invention are within the protection scope of the present invention, unless the content of the technical solution of the present invention is departed from.
Claims (10)
1. A broadband passive vibration isolator is characterized in that: including inertia subassembly and rotatory viscidity attenuator of enlargiing, rotatory viscidity attenuator includes outer tube (8) and inner tube (10), inner tube (10) set up in outer tube (8), it has viscidity material (9) to fill between inner tube (10) and outer tube (8), inertia subassembly drives inner tube (10) rotation in outer tube (8) when receiving load.
2. The broadband passive vibration isolator according to claim 1, wherein: the inertia amplification assembly comprises a fixed support (3), a ball screw (4) and a flywheel (5), one end of the ball screw (4) is connected to the bottom of the fixed support (3), the ball screw (4) is connected with a ball nut (6) in a threaded manner, the flywheel (5) is sleeved on the ball screw (4), and the bottom of the flywheel (5) is connected with the ball nut (6).
3. The broadband passive vibration isolator according to claim 2, wherein: the top of outer tube (8) is provided with the mounting hole, be provided with bearing (7) in the mounting hole, bearing (7) are connected with ball nut (6), the one end of ball nut (6) is passed the mounting hole and is connected with inner tube (10) in outer tube (8).
4. The broadband passive vibration isolator according to claim 2, wherein: still include fixing base (1) and first elastic component (2), the upper end and the fixing base (1) of first elastic component (2) are connected, and the bottom is connected with fixing support (3).
5. The broadband passive vibration isolator according to claim 4, wherein: the bottom of the outer pipe (8) is connected with a connecting seat (11) for sealing the bottom of the outer pipe (8).
6. The broadband passive vibration isolator according to claim 5, wherein: the connecting seat (11) is fixed on the base (18), a second elastic piece (16) is arranged on the base (18), an upper cover (13) is arranged at the top of the second elastic piece (16), and the second elastic piece (16) is sleeved outside the inertia amplification assembly and the rotary viscous damper.
7. The broadband passive vibration isolator according to claim 6, wherein: the novel rubber sleeve is characterized in that a cylinder body (17) is arranged on the base (18), the second elastic piece (16) is arranged in the cylinder body (17), the novel rubber sleeve further comprises a rubber sleeve (14), and two ends of the rubber sleeve (14) are fixed on the cylinder body (17) and the upper cover (13) through steel hoops (15) respectively.
8. The broadband passive vibration isolator according to claim 6, wherein: the upper cover (13) is connected with the fixed seat (1).
9. The broadband passive vibration isolator according to claim 6, wherein: the second elastic piece (16) and the first elastic piece (2) are both springs.
10. A method of damping vibration in a track system, the track system including a floating plate (22), the method characterized by: the broadband passive vibration isolator (19) as claimed in any one of claims 1 to 9 is arranged at the bottom of the floating plate (22), and the vibration response of the track system in a low frequency band is reduced through the broadband passive vibration isolator (19).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116427214A (en) * | 2023-04-23 | 2023-07-14 | 兰州交通大学 | Rail transit elastic damping node interventional vibration suppression device and rail plate structure |
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