CN110725161A - Vibration isolation distribution method of floating slab track bed vibration isolation device - Google Patents
Vibration isolation distribution method of floating slab track bed vibration isolation device Download PDFInfo
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- CN110725161A CN110725161A CN201911089565.0A CN201911089565A CN110725161A CN 110725161 A CN110725161 A CN 110725161A CN 201911089565 A CN201911089565 A CN 201911089565A CN 110725161 A CN110725161 A CN 110725161A
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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
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
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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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Abstract
The invention discloses a vibration isolation distribution method of a floating plate road bed vibration isolation device, wherein the vibration isolation device comprises a vibration isolator, a spring is arranged in the vibration isolator, and the method comprises the following steps: s1, setting the section parameters of the floating slab track; s2, setting vehicle type parameters of the track suitable for the A-type vehicle and the B-type vehicle to obtain the load distribution of the A-type vehicle and the B-type vehicle; s3, setting the distance between the vibration isolators and the distance between the track buckles on the floating plate, establishing a finite element model of the floating plate according to the section size of the floating plate, and simplifying the section of the floating plate into a rectangle; and (3) adopting an I-shaped steel section simplified steel rail model and establishing a steel rail finite element model. The invention provides a vibration isolation distribution method of a floating plate track bed vibration isolation device, which achieves better vibration attenuation effect on the basis of reducing the usage amount of springs by changing the distribution of vibration isolators on a floating plate track bed and simultaneously realizes the reduction of the construction cost of a floating plate track.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of rail transit, in particular to a vibration isolation distribution method of a floating slab track bed vibration isolation device.
[ background of the invention ]
Urban rail transit is the most ideal method for solving urban traffic problems due to the advantages of large capacity, safety, reliability, riding comfort and the like, however, vibration generated by rail running influences nearby buildings, residents and high-precision equipment. Therefore, various vibration damping measures should be adopted in the design and construction of the rail to reduce the influence of the rail operation on the surrounding environment. Among various vibration damping measures, the floating plate track bed is widely applied to rail transit with excellent vibration damping performance. However, the number of springs used in the floating deck bed is large, so that the construction cost is increased.
[ summary of the invention ]
The invention solves the technical problem that the construction cost is increased due to the fact that the number of the springs distributed on the floating plate track bed is large, and provides the vibration isolation distribution method of the floating plate track bed vibration isolation device, which reduces the usage amount of the springs by optimizing the distribution of the vibration isolators on the premise of not influencing the vibration attenuation and vibration isolation efficiency of the floating plate track.
The technical scheme of the invention is as follows:
the vibration isolation distribution method of the floating slab track bed vibration isolation device comprises a vibration isolator, wherein a spring is arranged in the vibration isolator, and the method comprises the following steps:
s1, setting the section parameters of the floating slab track;
s2, setting vehicle type parameters of the track suitable for the A-type vehicle and the B-type vehicle to obtain the load distribution of the A-type vehicle and the B-type vehicle;
s3, setting the distance between the vibration isolators and the distance between the track buckles on the floating plate, establishing a finite element model of the floating plate according to the section size of the floating plate, and simplifying the section of the floating plate into a rectangle; adopting an I-shaped steel section simplified steel rail model, and establishing a steel rail finite element model;
s4, setting concrete parameters, establishing a finite element model of the floating slab track bed with three connected floating slabs, and setting a plurality of arrangement schemes that vibration isolators are distributed on the floating slab track bed;
s5, in the floating slab track bed finite element model and the steel rail finite element model, respectively applying a vehicle A type vehicle load and a vehicle B type vehicle load on the middle floating slab, setting the boundary conditions of the floating slab track bed as the Z-direction freedom at the two ends of the floating slab track bed, and the X, Y direction and torque fixed constraint, and calculating to obtain the Z-direction maximum displacement of the floating slab track bed for respectively bearing the vehicle A and the vehicle B under a plurality of arrangement schemes;
s6, selecting the arrangement scheme with the minimum Z-direction maximum displacement value from the plurality of arrangement schemes of S5 as a preferred arrangement scheme by comparing the maximum Z-direction displacement, reducing the using amount of vibration isolators on the preferred arrangement scheme according to the rule of the influence of the vibration isolator distribution on the maximum Z-direction displacement obtained from the plurality of arrangement schemes of S5, and setting the vibration isolation distribution scheme of the vibration isolators on the floating slab track bed;
and S7, under the vibration isolation distribution scheme, calculating the maximum Z-direction displacement of the floating slab track bed under the loads of the A-type vehicle and the B-type vehicle respectively, setting the maximum Z-direction displacement of the floating slab track bed under the preferable arrangement scheme in S6 as a displacement contrast value, setting a displacement contrast value range, setting a spring stiffness selection range, and calculating the maximum Z-direction displacement of the floating slab track bed by adjusting the spring stiffness in the spring stiffness selection range.
S8, comparing the calculation result of S7 with the displacement comparison value range, if the calculation result is in the comparison value range, the vibration isolation distribution scheme of S6 is the optimal vibration isolation distribution scheme, at the moment, the maximum displacement of the track bed of the floating plate in the Z direction is defined as the target displacement, and the selected spring stiffness is defined as the target stiffness; if the calculation result is not within the displacement contrast value range, the vibration isolation distribution scheme of S6 is not the preferable vibration isolation distribution scheme, and the process returns to S6 to reset the vibration isolation distribution scheme.
The vibration isolation distribution method of the vibration isolation device for the floating plate track bed further comprises the following steps:
s9: in the preferred vibration isolation distribution scheme of S8, a plurality of spring rates are set, the maximum Z-direction displacement of the floating plate track bed at different spring rate values is calculated, the calculation result is compared with the target displacement in S7, and if the calculation result is smaller than the target displacement, the set spring rate is the preferred spring rate, and if the calculation result is larger than the target displacement, the target rate in S7 is the preferred spring rate.
In the vibration isolation distribution method of the floating slab track bed vibration isolation device, in S1, the floating slab track profile parameters include the width of the floating slab, the thickness of the floating slab, the distance between sleepers, the standard track gauge and the mass per meter of the floating slab.
In the vibration isolation distribution method of the floating track bed vibration isolation device as described above, in S2, the vehicle model parameters include vehicle length, fixed wheelbase, vehicle distance, passenger-carrying axle weight, and empty axle weight.
In the vibration isolation distribution method of the floating track bed vibration isolation device as described above, in S4, the concrete parameters include an elastic modulus, a poisson' S ratio, and a concrete density.
In the vibration isolation distribution method of the floating track bed vibration isolation device as described above, in S4, the plurality of arrangements include an arrangement using 32 vibration isolators and an arrangement using 36 vibration isolators.
In the vibration isolation distribution method of the floating track bed vibration isolation device described above, in S5, the X direction is the floating track bed length direction, the Y direction is the floating track bed width direction, and the Z direction is the floating track bed thickness direction.
The vibration isolation distribution method of the floating track bed vibration isolation device is 1133333333333311, wherein "1, 3" respectively indicates that one vibration isolator is arranged along the length direction of two rails at intervals of 1 or 3 rail buckles, and a total of 32 vibration isolators are provided.
According to the vibration isolation distribution method of the vibration isolation device for the floating slab track bed, the length of the floating slab track bed is 24.94m, the width of the floating slab track bed is 2.8m, and the distance between sleepers is 0.58 m.
According to the vibration isolation distribution method of the floating slab track bed vibration isolation device, the vibration isolator comprises a vibration isolator lower cover, a vibration isolator upper cover matched with the vibration isolator lower cover, an elastic part arranged between the vibration isolator lower cover and the vibration isolator upper cover, and a sleeve matched with the vibration isolator upper cover and used for supporting the floating slab track bed, and a distance adjusting mechanism used for adjusting the distance between the vibration isolator upper cover and the vibration isolator lower cover is arranged between the vibration isolator upper cover and the vibration isolator lower cover.
The invention provides a vibration isolation distribution method of a floating plate track bed vibration isolation device, which achieves better vibration attenuation effect on the basis of reducing the usage amount of springs by changing the distribution of vibration isolators on a floating plate track bed and simultaneously realizes the reduction of the construction cost of a floating plate track.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of the vibration isolation device of the present invention;
FIG. 2 is a half-sectional view of the vibration isolation device of the present invention;
fig. 3 is a schematic view showing a state of use of the vibration isolation device of the present invention.
[ detailed description ] embodiments
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
When embodiments of the present invention refer to the ordinal numbers "first", "second", etc., it should be understood that the words are used for distinguishing between them unless the context clearly dictates otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The vibration isolation distribution method of the floating slab track bed vibration isolation device comprises a vibration isolator, wherein a spring is arranged in the vibration isolator, and the method is characterized by comprising the following steps of:
s1, setting the section parameters of the floating slab track;
s2, setting vehicle type parameters of the track suitable for the A-type vehicle and the B-type vehicle to obtain the load distribution of the A-type vehicle and the B-type vehicle;
s3, setting the distance between the vibration isolators and the distance between the track buckles on the floating plate, establishing a finite element model of the floating plate according to the section size of the floating plate, and simplifying the section of the floating plate into a rectangle; adopting an I-shaped steel section simplified steel rail model, and establishing a steel rail finite element model; the rail buckle distance has two standard values of 0.6m and 0.58m, and the vibration isolator can be arranged between two rail buckles only due to the fact that the rail buckle distance is determined, so that the arrangement distance of the vibration isolator can be determined.
S4, setting concrete parameters, establishing a finite element model of the floating slab track bed with three connected floating slabs, and setting a plurality of arrangement schemes that vibration isolators are distributed on the floating slab track bed;
s5, in the floating slab track bed finite element model and the steel rail finite element model, respectively applying a vehicle A type vehicle load and a vehicle B type vehicle load on the middle floating slab, setting the boundary conditions of the floating slab track bed as the Z directions of two ends of the floating slab track bed are free, and fixedly constraining the X, Y direction and the torque, and calculating to obtain the Z direction maximum displacement of the floating slab track bed respectively bearing the vehicle A and the vehicle B under a plurality of arrangement schemes;
the calculations in this step are using finite element calculations. In this embodiment, the isolators are arranged along the length of two rails, and the plurality of arrangements include:
working condition 1, the distribution condition is as follows: 13323323332332331, 32 in total;
working condition 2, the distribution condition is as follows: 12333323332333321, 32 in total;
working condition 3, the distribution condition is as follows: 113322323232323311, 36 in total;
working condition 4, the distribution condition is as follows: 122222222222222221, 36 in total;
wherein "3, 2, 1" respectively indicate that one vibration isolator is arranged at every interval of 3, 2, 1 track buckles, and the track buckle interval is equal to the sleeper interval. The vibration isolator is arranged to the biggest interval and can only be 3 track buckles, and too big interval of vibration isolator can cause the spring rate increase, causes the trouble for manufacturing, installation etc..
S6, selecting the arrangement scheme with the maximum Z-direction displacement from the plurality of arrangement schemes of S5 as an optimal arrangement scheme by comparing the maximum Z-direction displacement, reducing the using amount of vibration isolators on the optimal arrangement scheme according to the rule of the influence of the vibration isolator distribution on the maximum Z-direction displacement obtained from the plurality of arrangement schemes of S5, and setting the vibration isolation distribution scheme of the vibration isolators on the floating slab track bed;
the maximum Z displacement and the frequency of the floating slab track bed under the vehicle-mounted B type vibration isolator in the four arrangement modes are calculated from S5 as follows:
working condition 1, deadweight displacement 2.7690mm, vehicle-mounted displacement 3.4538mm and frequency 9.5688/Hz;
working condition 2, deadweight displacement 2.8169mm, vehicle-mounted displacement 3.6118mm and frequency 9.5033/Hz;
working condition 3, dead weight displacement 2.7639mm, vehicle-mounted displacement 3.5055mm and frequency 9.5873/Hz;
working condition 4, deadweight displacement 2.3067mm, vehicle-mounted displacement 3.1483mm and frequency 10.486/Hz;
the maximum Z displacement and the frequency of the floating slab track bed under the vehicle-mounted A type under the vibration isolators in the four arrangement modes are calculated as follows from S5:
working condition 1, deadweight displacement 2.7690mm, vehicle-mounted displacement 3.9034mm and frequency 9.5688/Hz;
working condition 3, dead weight displacement 2.7639mm, vehicle-mounted displacement 3.9680mm and frequency 9.5873/Hz;
working condition 4, deadweight displacement 2.3067mm, vehicle-mounted displacement 3.5590mm and frequency 10.486/Hz;
according to the arrangement condition 4, the maximum Z displacement value of the A-type vehicle and the B-type vehicle is 3.559mm, the displacement under the dead weight load is 2.3067mm, the natural frequency is 10.486Hz, and the number of the springs used is 36.
By comparing the working condition 1 and the working condition 2, the denser the end part is, the smaller the maximum displacement value in the Z direction is. Comparing the working condition 3 with the working condition 4, the more uniform the distribution of the vibration isolators is, the smaller the maximum displacement value in the Z direction is. Therefore, the rule obtained in the step is that in order to keep the characteristic that the track of the floating slab is uniform and unchanged under the working condition of the driving dynamic load, the vibration isolators are uniformly arranged to ensure that the Z-direction displacement of the floating slab under the driving load is not sudden; in order to improve the structural rigidity at the interface of the floating slab track bed, the vibration isolators are encrypted, namely the vibration isolators at two ends of the floating slab track bed are required to be densely distributed, and the vibration isolators from two ends of the floating slab track bed to the middle are required to be uniformly distributed.
The vibration isolation distribution scheme is set to be 1133333333333311, wherein 3 and 1 respectively indicate that one vibration isolator is arranged at intervals of 3 and 1 tracks along the length direction of the floating plate, two sides of the floating plate in the width direction are jointly arranged, and 32 vibration isolators are arranged in total.
And S7, under the vibration isolation distribution scheme, calculating the maximum Z-direction displacement of the floating slab track bed under the loads of the A-type vehicle and the B-type vehicle respectively, setting the maximum Z-direction displacement of the floating slab track bed under the preferable arrangement scheme in S6 as a displacement contrast value, setting a displacement contrast value range, setting a spring stiffness selection range, and calculating the maximum Z-direction displacement of the floating slab track bed by adjusting the spring stiffness in the spring stiffness selection range. The calculation in the step is finite element calculation, in the embodiment, the range of the set contrast value is +/-5% of the contrast value, and the selection range of the spring stiffness is 6-9 kN/mm. In the embodiment, when the spring rate ranges from K to 8.9kN/mm, the dead weight displacement of the floating slab track bed is 2.4953mm, the vehicle-mounted displacement is 3.4441mm, and the frequency is 10.2150 Hz.
S8, comparing the calculation result of S7 with the displacement comparison value range, if the calculation result is in the comparison value range, the vibration isolation distribution scheme of S6 is the optimal vibration isolation distribution scheme, at the moment, the maximum displacement of the track bed of the floating plate in the Z direction is defined as the target displacement, and the selected spring stiffness is defined as the target stiffness; if the calculation result is not within the displacement contrast value range, the vibration isolation distribution scheme of S6 is not the preferable vibration isolation distribution scheme, and the process returns to S6 to reset the vibration isolation distribution scheme. In the embodiment, the vehicle-mounted displacement is 3.4441mm, the vehicle-mounted displacement is in the range of 3.5590mm +/-5% of the vehicle-mounted displacement of the working condition 4, the using amount of the vibration isolators of each floating slab track bed is reduced by 4, the construction and material cost can be obviously reduced under the condition that the stability and the vibration isolation efficiency of a track system are not influenced, and the vibration isolation distribution scheme 1133333333333311 is an optimal vibration isolation arrangement scheme.
The invention provides a vibration isolation distribution method of a floating plate track bed vibration isolation device, which achieves better vibration attenuation effect on the basis of reducing the usage amount of springs by changing the distribution of vibration isolators on a floating plate track bed and simultaneously realizes the reduction of the construction cost of a floating plate track.
Further, as a preferred embodiment of the present invention, but not limited thereto, the method further comprises the steps of:
s9: in the preferred vibration isolation distribution scheme of S8, a plurality of spring rates are set, the maximum Z-direction displacement of the floating plate track bed at different spring rate values is calculated, the calculation result is compared with the target displacement in S7, and if the calculation result is smaller than the target displacement, the set spring rate is the preferred spring rate, and if the calculation result is larger than the target displacement, the target rate in S7 is the preferred spring rate. In this example, the target stiffness was 8.9kN/mm, and the spring stiffness was set to be lower than the target stiffness in order to reduce the manufacturing cost. In the implementation, the spring stiffness distribution of 8.5kN/mm, 6.5522kN/mm, 5.3174kN/mm and 6.0482kN/mm is selected for calculation, and the calculation result is as follows:
k is 8.9kN/mm, deadweight displacement is 2.4953mm, vehicle-mounted displacement is 3.4441mm, and frequency is 10.2150 Hz.
K is 8.5kN/mm, deadweight displacement is 2.6120mm, vehicle-mounted displacement is 3.5632mm, and frequency is 9.9878 Hz.
K is 6.5522kN/mm, dead weight displacement is 3.3795mm, vehicle-mounted displacement is 4.3189mm, and frequency is 8.7957 Hz.
K is 5.3174kN/mm, dead weight displacement is 4.1505mm, vehicle-mounted displacement is 5.0434mm, and frequency is 7.9459 Hz.
K is 6.0482kN/mm, dead weight displacement is 3.5432mm, vehicle-mounted displacement is 4.5826mm, and frequency is 8.4594 Hz.
From the above calculation results, it can be concluded that the onboard displacement of the floating slab track bed under the preferred vibration isolation distribution scheme with 32 vibration isolators arranged is 3.5632mm and the frequency is 9.8978Hz when the spring rate is 8.5 kN/mm. The vehicle-mounted displacement is only 0.0042mm larger than the target displacement, but the inherent frequency is reduced by 0.4982Hz, the using amount of the vibration isolators of each floating slab track bed is reduced by 4, the construction and material costs can be obviously reduced under the condition of not influencing the stability and the vibration isolation efficiency of a track system, and the adopted spring parameters are optimal under the condition of the above spring stiffness.
Still further, as a preferred embodiment of the present solution, but not limited thereto, in S1, the floating plate track profile parameters include floating plate width, floating plate thickness, sleeper spacing, standard gauge, and floating plate mass per meter. In the embodiment, the width a of the floating plate is 2800mm, and the thickness b is 340 mm; the sleeper spacing c is 580mm, the standard gauge d is 1500mm, and the mass per meter is 60 kg.
Still further, as a preferred embodiment of the present invention, but not limited thereto, in S2, the vehicle type parameters include a vehicle length, a fixed wheelbase, a vehicle distance, a passenger axle weight, and an empty axle weight. Wherein the calculated vehicle length of the A-type vehicle is 22.8m, the fixed wheelbase is 2.5m, the vehicle distance is 13.2m, the passenger carrying axle weight is 160kN, and the empty axle weight is 85 kN; the calculated vehicle length of the B-type vehicle is 19.5m, the fixed wheelbase is 2.2m, the vehicle distance is 10.4m, the passenger axle weight is 140kN, and the empty axle weight is 85 kN.
Further, as a preferred embodiment of the present invention, but not limited thereto, in S4, the concrete parameters include an elastic modulus, a poisson' S ratio, and a concrete density. In the embodiment, the elastic modulus is 3.25E11Pa, the Poisson ratio is 0.2, and the concrete density is generally 2400-2600 kg/m3In this example, the density is 2500kg/m3。
Further, as a preferred embodiment of the present solution, but not limited thereto, in S4, the plurality of arrangements include an arrangement using 32 vibration isolators, and an arrangement using 36 vibration isolators. 32 or 36 are arranged according to the length of the floating slab track bed, and other quantities can be arranged but can influence the uniformity of the distribution of the springs, so that the descending displacement of a certain section of track under dynamic load is large, and derailment accidents are caused.
Still further, as a preferred embodiment of the present invention, but not limited thereto, in S5, the X direction is a floating track bed length direction, the Y direction is a floating track bed width direction, and the Z direction is a floating track bed thickness direction.
Still further, as a preferred embodiment of the present solution but not limited thereto, the vibration isolation distribution scheme is 1133333333333311, wherein "3, 1" respectively means that one vibration isolator is arranged every 1 or 3 rail buckles along the length direction of the two rails, and a total of 32 vibration isolators are provided.
Further, as a preferred embodiment of the present solution, but not limited thereto, the length of the floating slab track bed is 24.94m, the width thereof is 2.8m, and the distance between sleepers is 0.58 m.
Further, as a preferred embodiment of the present invention but not limited thereto, the vibration isolator 1 includes a vibration isolator lower cover 2, a vibration isolator upper cover 3 fitted to the vibration isolator lower cover 2, an elastic member 4 disposed between the vibration isolator lower cover 2 and the vibration isolator upper cover 3, and a sleeve 5 fitted to the vibration isolator upper cover 3 and used for supporting the floating slab track bed, and a distance adjusting mechanism 6 for adjusting a distance between the vibration isolator upper cover 3 and the vibration isolator lower cover 2 is provided therebetween. The vibration isolator also comprises damping oil, a sealing part and the like.
Further, as a preferred embodiment of the present invention, but not limited thereto, the distance adjusting mechanism 6 includes a screw 61 having one end threadedly engaged with the vibration isolator lower cover 2, and the other end of the screw 61 penetrates through the vibration isolator upper cover 3 and then engages with a nut to adjust the distance between the vibration isolator upper cover 3 and the vibration isolator lower cover 2. Screw rod one end and isolator lower cover screw-thread fit fix, because the elastic component between isolator upper cover and the isolator lower cover, the other end of screw rod passes the isolator upper cover to use the nut cooperation to fasten, compress tightly the isolator upper cover on the elastic component. In this embodiment, a gasket is further disposed between the upper cover of the vibration isolator and the nut.
Still further, as a preferred embodiment of the present invention, but not limited thereto, a support mechanism 60 for providing a support force to the sleeve 5 when the elastic member 4 is excessively compressed is provided between the vibration isolator upper cover 3 and the vibration isolator lower cover 2. The supporting mechanism is used for distributing part of load for the elastic piece when the elastic piece is excessively compressed, and meanwhile, the moving distance of the sleeve can be reduced, so that the sleeve is more stable in use, the displacement amplitude is reduced, the service life of the elastic piece is prolonged, and the maintenance cost is reduced.
Still further, as a preferred embodiment of the present invention but not limited thereto, the supporting mechanism 60 includes a bolt 62 disposed on the vibration isolator upper cover 3 and in threaded fit with the vibration isolator upper cover 3, and a hydraulic damping oil cylinder 63 disposed on the vibration isolator lower cover 2 and adapted to be sleeved on the bolt 62, and hydraulic damping oil is disposed between the hydraulic damping oil cylinder 63 and the bolt 62. The vibration isolator upper cover is provided with a through hole for the bolt to pass through, and the bolt can be rotated by using an inner hexagonal wrench from the upper part of the vibration isolator upper cover, so that the pressure in the hydraulic damping oil cylinder is adjusted, and pressure pre-tightening is also performed. In this embodiment, the hydraulic damping oil cylinder is located at the center of the lower cover of the vibration isolator, and the bolt is located at the center of the upper cover of the vibration isolator.
Still further, as a preferred embodiment of the present invention, but not limited thereto, a relief hole 621 for rotating the bolt 62 is provided at one end of the bolt 62 engaged with the vibration isolator upper cover 3. In this embodiment, the hole of stepping down is hexagon socket hole, covers on the isolator to be equipped with the through-hole that supplies the bolt to pass, covers the upper portion from the isolator, and the outside of isolator can use hexagon socket head cap spanner to rotate the bolt promptly, through the cooperation position between adjusting bolt and the isolator upper cover to adjust the pressure in the hydraulic damping oil section of thick bamboo. The stud is internally provided with a hexagonal wrench hole which can be directly adjusted by a hexagonal wrench so as to facilitate the installation of the floating bed and the adjustment work after the installation.
Further, as a preferred embodiment of the present disclosure, but not limited to, a limiting block 51 is disposed on an inner wall of the sleeve 5, a protruding block 31 is disposed on the vibration isolator upper cover 3, and when the vibration isolator upper cover 3 rotates to a position where the protruding block 31 corresponds to the limiting block 51, the protruding block 31 is pressed against the limiting block 51, so that the sleeve 5 is suspended. The vibration isolator upper cover is rotated to the position of the bump corresponding to the position of the limiting block, the bump is jacked on the limiting block, when the vibration isolator upper cover needs to be disassembled, the bump on the vibration isolator upper cover is separated from the position corresponding to the limiting block, and the vibration isolation device can be disassembled.
Still further, as a preferred embodiment of the present invention, but not limited thereto, a positioning block 52 for limiting the elastic element 4 is disposed on an inner wall of the sleeve 5. In this embodiment, the locating piece is triangle-shaped's triangle locating piece for the shape, is equipped with on the sleeve inner wall to be used for carrying on spacing triangle locating piece to the elastic component, and the right-angle side setting of triangle locating piece is at telescopic inner wall and bottom surface. The triangular positioning block can be used for abutting against the elastic piece when the sleeve is stressed unevenly to incline, and is used for preventing the sleeve from excessively inclining.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the thickness a of the vibration isolator upper cover 3 is 25mm, and the elastic member 4 includes a spring having a wire diameter of 55mm, a diameter of 200mm, and a length of 215 mm. The thickness of the upper cover of the vibration isolator is 25mm, so that the mechanical design requirements are met, and the weight of the material vibration reduction floating track bed sleeve can be saved. The elastic piece has reasonable size design and meets the use requirement.
Further, as a preferred embodiment of the present invention, but not limited thereto, the stiffness of the elastic member 4 is in the range of 8.5kN/mm ± 10%.
Still further, as a preferred embodiment of the present solution, but not limited thereto, a rubber pad 7 is disposed between the vibration isolator lower cover 2 and the ground. The rubber pad is used for antiskid and damping, also can avoid simultaneously ground unevenness, leads to the isolator lower cover can not hug closely the ground installation. And one surface of the rubber pad close to the ground is provided with an anti-slip groove.
As shown in fig. 3, the ballast bed 8 is floating, and the ground 9 is floating.
Set up the elastic component between isolator lower cover and the isolator upper cover of isolator, cover on the isolator and set up the sleeve that is used for supporting floating slab road bed and leaves the bottom surface, be equipped with apart from adjustment mechanism between isolator upper cover and the isolator lower cover, such vibration isolator part is few, simple structure just can adjust vibration isolator's height through apart from adjustment mechanism, and accommodation process is simple.
The invention provides a vibration isolation distribution method of a floating plate track bed vibration isolation device, which achieves better vibration attenuation effect on the basis of reducing the usage amount of springs by changing the distribution of vibration isolators on a floating plate track bed and simultaneously realizes the reduction of the construction cost of a floating plate track.
The foregoing is illustrative of the embodiments provided in connection with the detailed description and is not intended to limit the disclosure to the particular forms set forth herein. Similar or identical methods, structures, etc. as used herein, or several technical deductions or substitutions made on the premise of the idea of the present application, should be considered as the protection scope of the present application.
Claims (10)
1. The vibration isolation distribution method of the floating slab track bed vibration isolation device comprises a vibration isolator, wherein a spring is arranged in the vibration isolator, and the method is characterized by comprising the following steps of:
s1, setting the section parameters of the floating slab track;
s2, setting vehicle type parameters of the track suitable for the A-type vehicle and the B-type vehicle to obtain the load distribution of the A-type vehicle and the B-type vehicle;
s3, setting the distance between the vibration isolators and the distance between the track buckles on the floating plate, establishing a finite element model of the floating plate according to the section size of the floating plate, and simplifying the section of the floating plate into a rectangle; adopting an I-shaped steel section simplified steel rail model, and establishing a steel rail finite element model;
s4, setting concrete parameters, establishing a finite element model of the floating slab track bed with three connected floating slabs, and setting a plurality of arrangement schemes that vibration isolators are distributed on the floating slab track bed;
s5, in the floating slab track bed finite element model and the steel rail finite element model, respectively applying a vehicle A type vehicle load and a vehicle B type vehicle load on the middle floating slab, setting the boundary conditions of the floating slab track bed as the Z-direction freedom at the two ends of the floating slab track bed, and the X, Y direction and torque fixed constraint, and calculating to obtain the Z-direction maximum displacement of the floating slab track bed for respectively bearing the vehicle A and the vehicle B under a plurality of arrangement schemes;
s6, selecting the arrangement scheme with the minimum Z-direction maximum displacement value from the plurality of arrangement schemes of S5 as a preferred arrangement scheme by comparing the maximum Z-direction displacement, reducing the using amount of vibration isolators on the preferred arrangement scheme according to the rule of the influence of the vibration isolator distribution on the maximum Z-direction displacement obtained from the plurality of arrangement schemes of S5, and setting the vibration isolation distribution scheme of the vibration isolators on the floating slab track bed;
and S7, under the vibration isolation distribution scheme, calculating the maximum Z-direction displacement of the floating slab track bed under the loads of the A-type vehicle and the B-type vehicle respectively, setting the maximum Z-direction displacement of the floating slab track bed under the preferable arrangement scheme in S6 as a displacement contrast value, setting a displacement contrast value range, setting a spring stiffness selection range, and calculating the maximum Z-direction displacement of the floating slab track bed by adjusting the spring stiffness in the spring stiffness selection range.
S8, comparing the calculation result of S7 with the displacement comparison value range, if the calculation result is in the comparison value range, the vibration isolation distribution scheme of S6 is the optimal vibration isolation distribution scheme, at the moment, the maximum displacement of the track bed of the floating plate in the Z direction is defined as the target displacement, and the selected spring stiffness is defined as the target stiffness; if the calculation result is not within the displacement contrast value range, the vibration isolation distribution scheme of S6 is not the preferable vibration isolation distribution scheme, and the process returns to S6 to reset the vibration isolation distribution scheme.
2. The vibration isolation distribution method of a floating plate track bed vibration isolation device according to claim 1, further comprising the steps of:
s9: in the preferred vibration isolation distribution scheme of S8, a plurality of spring rates are set, the maximum Z-direction displacement of the floating plate track bed at different spring rate values is calculated, the calculation result is compared with the target displacement in S7, and if the calculation result is smaller than the target displacement, the set spring rate is the preferred spring rate, and if the calculation result is larger than the target displacement, the target rate in S7 is the preferred spring rate.
3. The vibration isolation distribution method of a floating plate track bed vibration isolation device according to claim 1, wherein in S1, said floating plate track profile parameters include floating plate width, floating plate thickness, sleeper spacing, gauge, and floating plate mass per meter.
4. The vibration isolation distribution method of the floating track bed vibration isolating device according to claim 1, wherein in S2, said vehicle model parameters include vehicle length, fixed wheelbase, vehicle distance, passenger axle weight, and empty axle weight.
5. The vibration isolation distribution method of a floating track bed vibration isolation device according to claim 1, wherein in S4, said concrete parameters include modulus of elasticity, poisson' S ratio, and concrete density.
6. The vibration isolation distribution method of the floating ramp bed vibration isolation device according to claim 1, wherein in S4, the plurality of arrangements includes an arrangement using 32 vibration isolators: and an arrangement using 36 isolators.
7. The vibration isolation distribution method of a floating track bed vibration isolating device according to claim 1, wherein in S5, said X direction is a floating track bed length direction, said Y direction is a floating track bed width direction, and said Z direction is a floating track bed thickness direction.
8. The vibration isolation distribution method of the floating track bed vibration isolation device according to claim 1, wherein the vibration isolation distribution scheme is 1133333333333311, wherein "1, 3" respectively means that one vibration isolator is arranged every 1 or 3 rail buckles along the length direction of the two rails, and a total of 32 vibration isolators are provided.
9. The vibration isolation distribution method of a floating track bed vibration isolation device according to claim 3, wherein said floating track bed has a length of 24.94m, a width of 2.8m and a sleeper interval of 0.58 m.
10. The vibration isolation distribution method of a floating plate track bed vibration isolation device according to claim 1, wherein: isolator (1) include isolator lower cover (2), with isolator lower cover (2) complex isolator upper cover (3), locate isolator lower cover (2) with elastic component (4) between isolator upper cover (3), and with isolator upper cover (3) cooperation is used for supporting sleeve (5) of floating slab track bed, isolator upper cover (3) with be equipped with between isolator lower cover (2) and be used for adjusting distance adjustment mechanism (6) of distance between the two.
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| CN201911089565.0A CN110725161A (en) | 2019-11-08 | 2019-11-08 | Vibration isolation distribution method of floating slab track bed vibration isolation device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832066A (en) * | 2021-03-04 | 2021-05-25 | 羿射旭减隔震张家口有限公司 | Vibration isolator for track floating plate |
| CN117328301A (en) * | 2023-10-09 | 2024-01-02 | 中铁十六局集团铁运工程有限公司 | Composite rubber spring in vibration isolator for floating slab track |
-
2019
- 2019-11-08 CN CN201911089565.0A patent/CN110725161A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832066A (en) * | 2021-03-04 | 2021-05-25 | 羿射旭减隔震张家口有限公司 | Vibration isolator for track floating plate |
| CN112832066B (en) * | 2021-03-04 | 2024-04-12 | 羿射旭减隔震张家口有限公司 | Vibration isolator for track floating plate |
| CN117328301A (en) * | 2023-10-09 | 2024-01-02 | 中铁十六局集团铁运工程有限公司 | Composite rubber spring in vibration isolator for floating slab track |
| CN117328301B (en) * | 2023-10-09 | 2024-05-10 | 中铁十六局集团铁运工程有限公司 | Composite rubber spring in vibration isolator for floating slab track |
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