Vibration Isolation Distribution Method for Floating Slab Ballast Isolation Device

Abstract

The vibration isolation distribution method of the vibration isolation device of the floating plate track bed of the present invention comprises a vibration isolator, wherein the vibration isolator is provided with a spring, and the method comprises the following steps: S1: setting the profile parameters of the floating plate track; S2: setting the vehicle parameters of the track applicable to type A and type B vehicles, and obtaining the load distribution of type A and type B vehicles; S3: setting the spacing of the vibration isolators and the spacing of the track buckles on the floating plate, establishing a floating plate finite element model according to the cross-sectional dimensions of the floating plate, and simplifying the cross section of the floating plate into a rectangle; using an I-beam cross section to simplify the rail model, and establishing a rail finite element model. The present invention provides a vibration isolation distribution method of the vibration isolation device of the floating plate track bed, and the present invention achieves a better vibration reduction effect on the basis of reducing the amount of springs used by changing the distribution of the vibration isolators on the floating plate track bed, and at the same time reduces the construction cost of the floating plate track.

Description

[Technical field]

[0001] The invention relates to the field of rail transportation, and in particular to a vibration isolation distribution method for a floating slab track bed vibration isolation device. [Background technology]

[0002] Urban rail transit has become the most ideal way to solve urban traffic problems with its advantages of large capacity, safety, reliability, and comfortable ride. However, the vibration generated by the track operation will affect nearby buildings, residents, and high-precision equipment. Therefore, a variety of vibration reduction measures should be adopted in the design and construction of the track to reduce the impact of the track operation on the surrounding environment. Among various vibration reduction measures, floating slab roadbed is widely used in rail transit due to its excellent vibration reduction performance. However, the number of springs used on the floating slab roadbed is large, which increases the construction cost. [Summary of the invention]

[0003] The present invention solves the technical problem that a large number of springs distributed on a floating plate track increases the construction cost, and provides a vibration isolation distribution method for a floating plate track vibration isolation device that reduces the amount of springs by optimizing the distribution of vibration isolators without affecting the vibration reduction and isolation efficiency of the floating plate track.

[0004] The technical solution of the present invention is as follows:

[0005] A vibration isolation distribution method for a floating slab track bed vibration isolation device, the vibration isolation device comprising a vibration isolator, a spring is arranged in the vibration isolator, and the method comprises the following steps:

[0006] S1: Setting the floating slab track profile parameters;

[0007] S2: setting the model parameters of the track applicable model A and B vehicles, and obtaining the load distribution of the A and B vehicles;

[0008] S3: setting the spacing between vibration isolators and track buckles on the floating plate, establishing a finite element model of the floating plate according to the cross-sectional dimensions of the floating plate, and simplifying the cross section of the floating plate into a rectangle; simplifying the rail model using the cross section of an I-beam, and establishing a finite element model of the rail;

[0009] S4: setting concrete parameters, establishing a finite element model of a floating slab ballast with three floating slabs connected, and setting multiple layout schemes of vibration isolators distributed on the floating slab ballast;

[0010] S5: In the floating slab finite element model and the rail finite element model, a load of a type A vehicle and a load of a type B vehicle are applied to the floating slab in the middle respectively, and the boundary conditions of the floating slab ballast are set as freedom in the Z direction at both ends of the floating slab ballast and fixed constraints in the X, Y directions and torque, and the maximum displacement in the Z direction of the floating slab ballast when carrying the type A vehicle and the type B vehicle under multiple layout schemes is calculated;

[0011] S6: By comparing the maximum displacement in the Z direction, the arrangement scheme with the least maximum displacement in the Z direction is selected as the preferred arrangement scheme from the multiple arrangement schemes of S5, and according to the law of the influence of the distribution of vibration isolators on the maximum displacement in the Z direction obtained from the multiple arrangement schemes of S5, the amount of vibration isolators is reduced in the above preferred arrangement scheme according to this law, and the vibration isolation distribution scheme of the vibration isolators on the floating plate track bed is set;

[0012] S7: Under the vibration isolation distribution scheme, calculate the maximum displacement in the Z direction of the floating slab track bed under the load of type A vehicle and type B vehicle respectively, set the maximum displacement in the Z direction of the floating slab track bed under the optimal layout scheme in S6 as the displacement comparison value, set the displacement comparison value range, set the spring stiffness selection range, and calculate the maximum displacement in the Z direction of the floating slab track bed by adjusting the spring stiffness within the spring stiffness selection range.

[0013] S8: Compare the calculation result of S7 with the displacement comparison value range. If the calculation result is within the comparison value range, the vibration isolation distribution scheme of S6 is the preferred vibration isolation distribution scheme. At this time, the maximum displacement in the Z direction of the floating plate track bed 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 comparison value range, the vibration isolation distribution scheme of S6 is not the preferred vibration isolation distribution scheme, and return to S6 to reset the vibration isolation distribution scheme.

[0014] The vibration isolation distribution method of the floating slab track bed vibration isolation device as described above further comprises the following steps:

[0015] S9: Under the preferred vibration isolation distribution scheme of S8, multiple spring stiffnesses are set, and the maximum displacement in the Z direction of the floating plate track bed under different spring stiffness values ​​is calculated. The calculated result is compared with the target displacement in S7. If the calculated result is smaller than the target displacement, the set spring stiffness is the preferred spring stiffness. If the calculated result is larger than the target displacement, the target stiffness in S7 is the preferred spring stiffness.

[0016] In the vibration isolation distribution method of the floating plate track bed vibration isolation device as described above, in S1, the floating plate track profile parameters include the floating plate width, floating plate thickness, sleeper spacing, standard track gauge and floating plate mass per meter.

[0017] In the vibration isolation distribution method of the floating slab roadbed vibration isolation device as described above, in S2, the vehicle type parameters include vehicle length, fixed wheelbase, vehicle fixed distance, passenger axle weight and empty vehicle axle weight.

[0018] In the vibration isolation distribution method of the floating slab track vibration isolation device as described above, in S4, the concrete parameters include elastic modulus, Poisson's ratio, and concrete density.

[0019] In the vibration isolation distribution method of the floating slab track vibration isolation device as described above, in S4, the multiple arrangement schemes include an arrangement scheme using 32 vibration isolators and an arrangement scheme using 36 vibration isolators.

[0020] In the vibration isolation distribution method of the floating slab track bed vibration isolation device as described above, in S5, the X direction is the length direction of the floating slab track bed, the Y direction is the width direction of the floating slab track bed, and the Z direction is the thickness direction of the floating slab track bed.

[0021] As described above, the vibration isolation distribution method of the floating slab track bed vibration isolation device, the vibration isolation distribution scheme is 1133333333333311, wherein "1, 3" respectively indicate that a vibration isolator is arranged every 1 or 3 track clips along the length direction of the two tracks, and a total of 32 vibration isolators are arranged.

[0022] According to the vibration isolation distribution method of the floating slab ballast vibration isolation device as described above, the floating slab ballast has a length of 24.94 m, a width of 2.8 m, and a sleeper spacing of 0.58 m.

[0023] According to the vibration isolation distribution method of the floating slab ballast vibration isolation device as described above, the vibration isolator includes a vibration isolator lower cover, a vibration isolator upper cover matched with the vibration isolator lower cover, an elastic member 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 to support the floating slab ballast, and a distance adjustment mechanism for adjusting the distance between the vibration isolator upper cover and the vibration isolator lower cover is provided between the vibration isolator upper cover and the vibration isolator lower cover.

[0024] The present invention provides a vibration isolation distribution method for a floating plate track bed vibration isolation device. The present invention achieves better vibration reduction effect on the basis of reducing the amount of springs used by changing the distribution of vibration isolators on the floating plate track bed, while reducing the construction cost of the floating plate track.

Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic structural diagram of the vibration isolation device of the present invention;

[0027] Figure 2 is a half-section view of the vibration isolation device of the present invention;

[0028] Figure 3 It is a schematic diagram of the use state of the vibration isolation device of the present invention. [Specific implementation method]

[0029] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] When the embodiments of the present invention mention ordinal numbers such as "first" and "second", unless they do express the meaning of order according to the context, they should be understood as being merely for the purpose of distinction.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] A vibration isolation distribution method for a floating slab track bed vibration isolation device, the vibration isolation device comprising a vibration isolator, wherein a spring is arranged in the vibration isolator, wherein the method comprises the following steps:

[0033] S1: Setting the floating slab track profile parameters;

[0034] S2: setting the model parameters of the track applicable model A and B vehicles, and obtaining the load distribution of the A and B vehicles;

[0035] S3: Set the spacing between the isolators and the track buckle spacing on the floating plate, establish a floating plate finite element model according to the cross-sectional dimensions of the floating plate, and simplify the cross section of the floating plate into a rectangle; use the I-beam cross section to simplify the rail model and establish a rail finite element model; the track buckle spacing has two standard values ​​of 0.6m and 0.58m. Since the track buckle spacing is determined and the isolator can only be arranged between two track buckles, the arrangement spacing of the isolator can be determined.

[0036] S4: setting concrete parameters, establishing a finite element model of a floating slab ballast with three floating slabs connected, and setting multiple layout schemes of vibration isolators distributed on the floating slab ballast;

[0037] S5: In the floating slab finite element model and the rail finite element model, a load of a type A vehicle and a load of a type B vehicle are applied to the middle floating slab respectively, and the boundary conditions of the floating slab ballast are set as freedom in the Z direction at both ends of the floating slab ballast and fixed constraints in the X, Y directions and torque, and the maximum displacement in the Z direction of the floating slab ballast when carrying the type A vehicle and the type B vehicle under multiple layout schemes is calculated;

[0038] The calculation in this step is performed using finite element calculation. In this embodiment, the vibration isolators are arranged along the length direction of the two rails, and multiple arrangement schemes include:

[0039] Working condition 1, the distribution is: 13323323332332331, a total of 32;

[0040] Working condition 2, the distribution is: 12333323332333321, a total of 32;

[0041] Working condition 3, the distribution is: 113322323232323311, a total of 36;

[0042] Working condition 4, the distribution is: 122222222222222221, a total of 36;

[0043] "3, 2, 1" means that one vibration isolator is arranged every 3, 2, and 1 track clips, respectively, and the track clip spacing is equal to the sleeper spacing. The maximum spacing of the vibration isolator can only be 3 track clips. If the spacing of the vibration isolators is too large, the spring stiffness will increase, causing troubles in manufacturing and installation.

[0044] S6: by comparing the maximum displacement in the Z direction, the arrangement scheme with the maximum displacement in the Z direction is selected as the preferred arrangement scheme from the multiple arrangement schemes of S5, and according to the law of the influence of the distribution of vibration isolators on the maximum displacement in the Z direction obtained from the multiple arrangement schemes of S5, the amount of vibration isolators is reduced in the above preferred arrangement scheme according to this law, and the vibration isolation distribution scheme of the vibration isolators on the floating plate track bed is set;

[0045] The maximum displacement and frequency of the Z-direction displacement of the floating slab ballast under the B-type vehicle under the above four arrangements of the vibration isolators are calculated by S5 as follows:

[0046] Condition 1, self-weight displacement 2.7690mm, vehicle displacement 3.4538mm, frequency 9.5688 / Hz;

[0047] Condition 2, self-weight displacement 2.8169mm, vehicle displacement 3.6118mm, frequency 9.5033 / Hz;

[0048] Condition 3, self-weight displacement 2.7639mm, vehicle displacement 3.5055mm, frequency 9.5873 / Hz;

[0049] Condition 4, self-weight displacement 2.3067mm, vehicle displacement 3.1483mm, frequency 10.486 / Hz;

[0050] The maximum displacement and frequency of the Z-direction displacement of the floating slab ballast under the A-type vehicle under the above four arrangements of the vibration isolators are calculated by S5 as follows:

[0051] Condition 1, self-weight displacement 2.7690mm, vehicle displacement 3.9034mm, frequency 9.5688 / Hz;

[0052] Condition 2, self-weight displacement 2.8169mm, vehicle displacement 4.0804mm, frequency 9.5033 / Hz;

[0053] Condition 3, self-weight displacement 2.7639mm, vehicle displacement 3.9680mm, frequency 9.5873 / Hz;

[0054] Condition 4, self-weight displacement 2.3067mm, vehicle displacement 3.5590mm, frequency 10.486 / Hz;

[0055] It was found that under the working condition 4 arrangement, the maximum Z-direction displacement of type A and type B vehicles was the smallest, which was 3.559 mm. The displacement under deadweight load was still 2.3067 mm, and the natural frequency was 10.486 Hz. At this time, the number of springs used was 36.

[0056] By comparing working condition 1 and working condition 2, the denser the ends, the smaller the maximum displacement value in the Z direction. By comparing working condition 3 and working condition 4, it can be found that the more evenly the isolators are distributed, the smaller the maximum displacement value in the Z direction. Therefore, the rule obtained in this step is that in order to maintain the uniform and unchanged characteristics of the floating plate track under the dynamic load conditions of driving, the isolators should be evenly arranged so that the Z displacement of the floating plate under the driving load will not change suddenly; at the interface of the floating plate trackbed, in order to improve the structural stiffness, the isolators should be encrypted, that is, the isolators at both ends of the floating plate trackbed need to be densely distributed, and the isolators from both ends of the floating plate trackbed to the middle need to be evenly distributed.

[0057] The vibration isolation distribution plan is set to 1133333333333311, where "3, 1" respectively means that a vibration isolator is arranged at intervals of 3 and 1 track clips along the length direction of the floating plate, and they are arranged on both sides of the width direction of the floating plate, for a total of 32 vibration isolators.

[0058] S7: Under the vibration isolation distribution scheme, calculate the maximum displacement in the Z direction of the floating plate track bed under the load of type A vehicle and type B vehicle respectively, set the maximum displacement in the Z direction of the floating plate track bed under the preferred arrangement scheme in S6 as the displacement comparison value, set the displacement comparison value range, set the spring stiffness selection range, and calculate the maximum displacement in the Z direction of the floating plate track bed by adjusting the spring stiffness within the spring stiffness selection range. The calculation in this step is performed using finite element calculation. In this embodiment, the range of the set comparison value is comparison value ±5%, and the spring stiffness selection range is 6 to 9 kN / mm. In this embodiment, when the spring stiffness range is K = 8.9 kN / mm, the self-weight displacement of the floating plate track bed is 2.4953 mm, the vehicle-mounted displacement is 3.4441 mm, and the frequency is 10.2150 Hz.

[0059] S8: Compare the calculation result of S7 with the displacement comparison value range. If the calculation result is within the comparison value range, the vibration isolation distribution scheme of S6 is the preferred vibration isolation distribution scheme. At this time, the maximum displacement in the Z direction of the floating plate track bed 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 comparison value range, the vibration isolation distribution scheme of S6 is not the preferred vibration isolation distribution scheme, and return to S6 to reset the vibration isolation distribution scheme. In this embodiment, the vehicle displacement of 3.4441mm is within the vehicle displacement range of 3.5590mm±5% of working condition 4. The number of vibration isolators used for each floating plate track bed is reduced by 4, which can significantly reduce the construction and material costs without affecting the stability of the track system and the vibration isolation efficiency. The vibration isolation distribution scheme 1133333333333311 is the preferred vibration reduction arrangement scheme.

[0060] The present invention provides a vibration isolation distribution method for a floating plate track bed vibration isolation device. The present invention achieves better vibration reduction effect on the basis of reducing the amount of springs used by changing the distribution of vibration isolators on the floating plate track bed, while reducing the construction cost of the floating plate track.

[0061] Furthermore, as a preferred implementation mode of this solution but not limiting, the following steps are also included:

[0062] S9: Under the preferred vibration isolation distribution scheme of S8, set multiple spring stiffnesses, calculate the maximum displacement in the Z direction of the floating plate track bed under different spring stiffness values, and compare the calculated results with the target displacement in S7. If the calculated result is smaller than the target displacement, the set spring stiffness is the preferred spring stiffness. If the calculated result is larger than the target displacement, the target stiffness in S7 is the preferred spring stiffness. In this implementation, the target stiffness is 8.9 kN / mm. In order to reduce manufacturing costs, the set spring stiffness is lower than the target stiffness. In this implementation, spring stiffness distributions of 8.5 kN / mm, 6.5522 kN / mm, 5.3174 kN / mm, and 6.0482 kN / mm were selected for calculation, and the calculation results are as follows:

[0063] K=8.9kN / mm, self-weight displacement 2.4953mm, vehicle displacement 3.4441mm, frequency 10.2150Hz.

[0064] K=8.5kN / mm, self-weight displacement 2.6120mm, vehicle displacement 3.5632mm, frequency 9.9878Hz.

[0065] K=6.5522kN / mm, self-weight displacement 3.3795mm, vehicle displacement 4.3189mm, frequency 8.7957Hz.

[0066] K=5.3174kN / mm, self-weight displacement 4.1505mm, vehicle displacement 5.0434mm, frequency 7.9459Hz.

[0067] K=6.0482kN / mm, self-weight displacement 3.5432mm, vehicle displacement 4.5826mm, frequency 8.4594Hz.

[0068] From the above calculation results, it can be concluded that when the spring stiffness is 8.5kN / mm, the vehicle displacement of the floating slab track bed is 3.5632mm and the frequency is 9.8978Hz under the optimal vibration isolation distribution scheme with 32 vibration isolators. The vehicle displacement is only 0.0042mm larger than the target displacement, but the natural frequency is reduced by 0.4982Hz. The number of vibration isolators used for each floating slab track bed is reduced by 4, which can significantly reduce the construction and material costs without affecting the stability of the track system and the vibration isolation efficiency. The spring parameters used are optimal under the above spring stiffness.

[0069] Further, as a preferred implementation of this solution but not limiting, in S1, the floating plate track profile parameters include floating plate width, floating plate thickness, sleeper spacing, standard track gauge and floating plate mass per meter. In this embodiment, the floating plate width a = 2800mm, thickness b = 340mm; sleeper spacing c = 580mm, standard track gauge d = 1500mm, and mass per meter 60kg.

[0070] Further, as a preferred implementation of this solution but not limiting, in S2, the vehicle type parameters include vehicle length, fixed wheelbase, vehicle fixed distance, passenger axle weight and empty vehicle axle weight. , wherein the calculated vehicle length of type A vehicle is 22.8m, the fixed wheelbase is 2.5m, the vehicle fixed distance is 13.2m, the passenger axle weight is 160kN, and the empty vehicle axle weight is 85kN; the calculated vehicle length of type B vehicle is 19.5m, the fixed wheelbase is 2.2m, the vehicle fixed distance is 10.4m, the passenger axle weight is 140kN, and the empty vehicle axle weight is 85 kN.

[0071] Furthermore, as a preferred implementation of this solution but not limiting, in S4, the concrete parameters include elastic modulus, Poisson's ratio, and concrete density. In this embodiment, the elastic modulus is 3.25E11Pa, the Poisson's ratio is 0.2, and the concrete density is generally 2400-2600kg / m 3 In this embodiment, the density is 2500kg / m 3 .

[0072] Furthermore, as a preferred implementation of the present solution but not a limitation, in S4, the multiple arrangements include an arrangement using 32 vibration isolators and an arrangement using 36 vibration isolators. The arrangement of 32 or 36 is based on the length of the floating slab track bed. Other numbers can also be arranged but will affect the uniformity of the spring distribution, resulting in a large downward displacement of a certain section of track under dynamic load, causing a derailment accident.

[0073] Furthermore, as a preferred implementation of the present solution but not limiting, in S5, the X direction is the length direction of the floating slab track bed, the Y direction is the width direction of the floating slab track bed, and the Z direction is the thickness direction of the floating slab track bed.

[0074] Furthermore, as a preferred implementation manner of the present scheme but not a limitation, the vibration isolation distribution scheme is 1133333333333311, where "3, 1" respectively indicates that a vibration isolator is arranged every 1 or 3 track clips along the length direction of the two tracks, and a total of 32 vibration isolators are arranged.

[0075] Furthermore, as a preferred embodiment of the present invention but not a limitation, the floating slab track bed has a length of 24.94 m, a width of 2.8 m, and a sleeper spacing of 0.58 m.

[0076] Furthermore, as a preferred embodiment of the present invention but not limiting, the vibration isolator 1 includes a vibration isolator lower cover 2, a vibration isolator upper cover 3 matched with the vibration isolator lower cover 2, an elastic member 4 provided between the vibration isolator lower cover 2 and the vibration isolator upper cover 3, and a sleeve 5 matched with the vibration isolator upper cover 3 and used to support the floating plate ballast, and a distance adjustment mechanism 6 for adjusting the distance between the vibration isolator upper cover 3 and the vibration isolator lower cover 2 is provided between them. The vibration isolator also includes damping oil, sealing components, etc.

[0077] Further, as a preferred embodiment of the present scheme but not a limitation, the distance adjustment mechanism 6 includes a screw 61 having one end threadedly engaged with the isolator lower cover 2, and the other end of the screw 61 passes through the isolator upper cover 3 and then engages with a nut to adjust the distance between the isolator upper cover 3 and the isolator lower cover 2. One end of the screw is threadedly engaged with the isolator lower cover for fixing, because there is an elastic member between the isolator upper cover and the isolator lower cover, the other end of the screw passes through the isolator upper cover, and is fastened with a nut to press the isolator upper cover onto the elastic member. In this embodiment, a gasket is also provided between the isolator upper cover and the nut.

[0078] Furthermore, as a preferred embodiment of the present invention but not a limitation, a support mechanism 60 for providing support force for the sleeve 5 when the elastic member 4 is over-compressed is provided between the upper cover 3 of the vibration isolator and the lower cover 2 of the vibration isolator. The support mechanism is used to share part of the load for the elastic member when the elastic member is over-compressed, and can also reduce the moving distance of the sleeve, so that the sleeve is more stable during use, and the displacement amplitude is reduced, which is also conducive to extending the service life of the elastic member, thereby reducing the maintenance cost.

[0079] Furthermore, as a preferred embodiment of the present scheme but not limiting, the support mechanism 60 includes a bolt 62 provided on the isolator upper cover 3 and threadedly matched with the isolator upper cover 3, and a hydraulic damping oil cylinder 63 provided on the isolator lower cover 2 for sleeved on the bolt 62, and hydraulic damping oil is provided between the hydraulic damping oil cylinder 63 and the bolt 62. The isolator upper cover is provided with a through hole for the bolt to pass through, and the bolt can be rotated from the upper part of the isolator upper cover using an Allen wrench to adjust the pressure in the hydraulic damping oil cylinder and also perform pressure pre-tightening. In this embodiment, the hydraulic damping oil cylinder is located at the center of the isolator lower cover, and the bolt is provided at the center of the isolator upper cover.

[0080] Furthermore, as a preferred embodiment of the present invention but not a limitation, a clearance hole 621 for rotating the bolt 62 is provided on one end of the bolt 62 that cooperates with the upper cover 3 of the vibration isolator. In this embodiment, the clearance hole is a hexagonal hole, and the upper cover of the vibration isolator is provided with a through hole for the bolt to pass through. The bolt can be rotated using an hexagonal wrench from the upper part of the upper cover of the vibration isolator, that is, the outside of the vibration isolator. By adjusting the matching position between the bolt and the upper cover of the vibration isolator, the pressure in the hydraulic damping oil cylinder can be adjusted. The stud has a built-in hexagonal wrench hole, which can be adjusted directly with a hexagonal wrench to facilitate the installation of the float to the bed and the adjustment work after installation.

[0081] Furthermore, as a preferred embodiment of the present invention but not a limitation, a limit block 51 is provided on the inner wall of the sleeve 5, and a protrusion 31 is provided on the upper cover 3 of the vibration isolator. When the upper cover 3 of the vibration isolator is rotated to the position where the protrusion 31 corresponds to the position of the limit block 51, the protrusion 31 is pressed against the limit block 51, so that the sleeve 5 is suspended. When the upper cover of the vibration isolator is rotated to the position where the protrusion corresponds to the limit block, the protrusion is pressed against the limit block. When disassembly is required, the vibration isolator only needs to be rotated to disengage the protrusion on the upper cover of the vibration isolator from the position corresponding to the limit block, and the vibration isolation device can be disassembled.

[0082] Further, as a preferred embodiment of the present invention but not a limitation, a positioning block 52 for limiting the elastic member 4 is provided on the inner wall of the sleeve 5. In this embodiment, the positioning block is a triangular positioning block in a triangular shape, and a triangular positioning block for limiting the elastic member is provided on the inner wall of the sleeve, and the right-angled sides of the triangular positioning block are arranged on the inner wall and the bottom surface of the sleeve. The triangular positioning block can be used to press against the elastic member when the sleeve is unevenly stressed and tilted, so as to prevent the sleeve from tilting excessively.

[0083] Furthermore, as a preferred embodiment of the present invention but not a limitation, the thickness a of the upper cover 3 of the vibration isolator is 25 mm, and the elastic member 4 includes a spring with a wire diameter of 55 mm, a diameter of 200 mm, and a length of 215 mm. The thickness of the upper cover of the vibration isolator is 25 mm, which not only meets the mechanical design requirements but also saves the weight of the material-damping floating track bed sleeve. The size design of the elastic member is reasonable and meets the use requirements.

[0084] Furthermore, as a preferred implementation of the present solution but not limiting, the stiffness range of the elastic member 4 is 8.5 kN / mm±10%.

[0085] Furthermore, as a preferred embodiment of the present invention but not a limitation, a rubber pad 7 is provided between the lower cover 2 of the vibration isolator and the ground. The rubber pad is used for anti-skid and vibration reduction, and can also prevent the lower cover of the vibration isolator from being installed close to the ground due to uneven ground. An anti-skid groove is provided on the side of the rubber pad that is close to the ground.

[0086] like Figure 3 As shown, there is a floating slab track bed 8 and a ground surface 9.

[0087] An elastic member is arranged between the lower cover and the upper cover of the vibration isolator, a sleeve for supporting the floating plate ballast away from the bottom surface is arranged on the upper cover of the vibration isolator, and a distance adjustment mechanism is arranged between the upper cover and the lower cover of the vibration isolator. Such a vibration isolation device has few parts and a simple structure. The height of the vibration isolation device can be adjusted by the distance adjustment mechanism, and the adjustment process is simple.

[0088] The present invention provides a vibration isolation distribution method for a floating plate track bed vibration isolation device. The present invention achieves better vibration reduction effect on the basis of reducing the amount of springs used by changing the distribution of vibration isolators on the floating plate track bed, while reducing the construction cost of the floating plate track.

[0089] The above are implementation methods provided in combination with specific contents, and the specific implementation of this application is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of this application, or any technical deduction or replacement made on the premise of the concept of this application, shall be deemed as the protection scope of this application.

Claims

1. A vibration isolation distribution method for a floating slab track bed vibration isolation device, wherein the vibration isolation device comprises a vibration isolator, wherein a spring is provided in the vibration isolator, It is characterized in that The method comprises the following steps: S1: Setting the floating slab track profile parameters; S2: setting the model parameters of the track applicable model A and B vehicles, and obtaining the load distribution of the A and B vehicles; S3: setting the spacing between vibration isolators and track buckles on the floating plate, establishing a finite element model of the floating plate according to the cross-sectional dimensions of the floating plate, and simplifying the cross section of the floating plate into a rectangle; simplifying the rail model using the cross section of an I-beam, and establishing a finite element model of the rail; S4: setting concrete parameters, establishing a finite element model of a floating slab ballast with three floating slabs connected, and setting multiple layout schemes of vibration isolators distributed on the floating slab ballast; S5: In the floating slab finite element model and the rail finite element model, a load of a type A vehicle and a load of a type B vehicle are applied to the floating slab in the middle respectively, and the boundary conditions of the floating slab ballast are set as freedom in the Z direction at both ends of the floating slab ballast and fixed constraints in the X, Y directions and torque, and the maximum displacement in the Z direction of the floating slab ballast when carrying the type A vehicle and the type B vehicle under multiple layout schemes is calculated; S6: By comparing the maximum displacement in the Z direction, the arrangement scheme with the least maximum displacement in the Z direction is selected as the preferred arrangement scheme from the multiple arrangement schemes of S5, and according to the law of the influence of the distribution of vibration isolators on the maximum displacement in the Z direction obtained from the multiple arrangement schemes of S5, the amount of vibration isolators is reduced in the above preferred arrangement scheme according to this law, and the vibration isolation distribution scheme of the vibration isolators on the floating plate track bed is set; S7: Under the vibration isolation distribution scheme, the maximum displacement in the Z direction of the floating plate track bed under the load of type A vehicle and type B vehicle is calculated, the maximum displacement in the Z direction of the floating plate track bed under the optimal arrangement scheme in S6 is set as the displacement comparison value, and the displacement comparison value range is set, the spring stiffness selection range is set, and the maximum displacement in the Z direction of the floating plate track bed is calculated by adjusting the spring stiffness within the spring stiffness selection range; S8: Compare the calculation result of S7 with the displacement comparison value range. If the calculation result is within the comparison value range, the vibration isolation distribution scheme of S6 is the preferred vibration isolation distribution scheme. At this time, the maximum displacement in the Z direction of the floating plate track bed 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 comparison value range, the vibration isolation distribution scheme of S6 is not the preferred vibration isolation distribution scheme, and return to S6 to reset the vibration isolation distribution scheme.

2. The vibration isolation distribution method of the floating slab track vibration isolation device according to claim 1, It is characterized in that The following steps are also included: S9: Under the preferred vibration isolation distribution scheme of S8, multiple spring stiffnesses are set, and the maximum displacement in the Z direction of the floating plate track bed under different spring stiffness values ​​is calculated. The calculated result is compared with the target displacement in S7. If the calculated result is smaller than the target displacement, the set spring stiffness is the preferred spring stiffness. If the calculated result is larger than the target displacement, the target stiffness in S7 is the preferred spring stiffness.

3. The vibration isolation distribution method of the floating slab ballast vibration isolation device according to claim 1, It is characterized in that In S1, the floating plate track profile parameters include floating plate width, floating plate thickness, sleeper spacing, standard track gauge and floating plate mass per meter.

4. The vibration isolation distribution method of the floating slab track vibration isolation device according to claim 1, It is characterized in that In S2, the vehicle model parameters include vehicle length, fixed wheelbase, vehicle fixed distance, passenger axle weight and empty vehicle axle weight.

5. The vibration isolation distribution method of the floating slab track vibration isolation device according to claim 1, It is characterized in that In S4, the concrete parameters include elastic modulus, Poisson's ratio, and concrete density.

6. The vibration isolation distribution method of the floating slab track vibration isolation device according to claim 1, It is characterized in that In S4, the plurality of arrangements include an arrangement using 32 vibration isolators and an arrangement using 36 vibration isolators.

7. The vibration isolation distribution method of the floating slab track vibration isolation device according to claim 1, It is characterized in that In S5, the X direction is the length direction of the floating slab track bed, the Y direction is the width direction of the floating slab track bed, and the Z direction is the thickness direction of the floating slab track bed.

8. The vibration isolation distribution method of the floating slab track vibration isolation device according to claim 1, It is characterized in that The vibration isolation distribution plan is 11333333333333311, where "1" and "3" respectively indicate that a vibration isolator is arranged every 1 or 3 track clips along the length direction of the two tracks, and a total of 32 vibration isolators are arranged.

9. The vibration isolation distribution method of the floating slab track vibration isolation device according to claim 3, It is characterized in that The floating slab ballast has a length of 24.94m, a width of 2.8m, and a sleeper spacing of 0.58m.

10. The vibration isolation distribution method of the floating slab track vibration isolation device according to claim 1, Features: The vibration isolator (1) comprises a vibration isolator lower cover (2), a vibration isolator upper cover (3) matched with the vibration isolator lower cover (2), an elastic member (4) arranged between the vibration isolator lower cover (2) and the vibration isolator upper cover (3), and a sleeve (5) matched with the vibration isolator upper cover (3) and used for supporting a floating plate ballast bed; a distance adjustment mechanism (6) for adjusting the distance between the vibration isolator upper cover (3) and the vibration isolator lower cover (2) is arranged between the vibration isolator upper cover (3) and the vibration isolator lower cover (2).

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