Rail transit floating slab track vibration isolator

Abstract

The application provides a floating slab track vibration isolator for rail transit, and belongs to the technical field of rail transit vibration reduction.The vibration isolator comprises a steel framework, which is used as a main body of the vibration isolator and is used for providing supporting stiffness; a rotating mass, which is used for absorbing the vertical load received by the vibration isolator; and a rubber connecting piece, which is used for controlling the rotating motion of the rotating mass.The steel framework is a hollow cage structure, the rotating mass is placed in the interior of the steel framework, and the rotating mass is connected with the steel framework through the rubber connecting piece.When the vertical load caused by train operation is applied to the vibration isolator, the steel framework produces torsional deformation, and at the same time, the rubber connecting piece drives the rotating mass to rotate, so that a part of energy is transferred to the rotating mass, thereby achieving vibration isolation.The vibration isolator provided by the application has additional compression-torsion coupling performance, thereby having additional vibration isolation capacity, and has a simple structure, and by increasing the cross-sectional area of the supporting part, the vibration isolator can ensure sufficient carrying capacity.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology for rail transit, and in particular to a floating slab track vibration isolator for rail transit. Background Technology

[0002] With the development of urban rail transit, train speeds are constantly increasing and network density is expanding, leading to increasingly serious environmental vibration problems caused by train operation. Currently, vibration reduction measures in the rail transit field can be divided into three levels: medium-level, high-level, and special-level vibration reduction. Among these, steel spring vibration isolators offer the best vibration isolation capability. Steel spring vibration isolators are installed between a floating slab and the foundation, with the upper part supporting the floating slab and the lower part connecting to the foundation. While steel springs have excellent vibration isolation effects, their vibration isolation capacity still needs further improvement.

[0003] Currently, He Ligong et al. have proposed a study on the vibration reduction characteristics of chiral superstructure vibration isolators for floating slab track systems. Among their findings is a floating slab track vibration isolator. This type of isolator utilizes the characteristics of chiral superstructures to convert compressive deformation into torsional deformation, thereby converting the vibrational energy of vertical vibration into kinetic energy in the rotational direction, thus achieving vibration isolation. Although the vibration isolator proposed by He Ligong et al. has achieved some progress, it also has shortcomings: the isolator is relatively complex to manufacture, which is not conducive to production and installation; and because the cross-section of the isolator is square, it cannot be directly replaced with the existing isolators on site; from a safety perspective, based on... Figure 1 As shown, the cross-sections of each component are too small, which is not conducive to load bearing. In particular, the strong impact during train operation can easily cause the structure to become unstable, posing a safety hazard. From the perspective of compression and torsion performance, although it can convert compression deformation into torsion deformation, its deformation under load is too large, resulting in limited vibration isolation capacity. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a floating slab track vibration isolator for rail transit. Due to its additional compression-torsion coupling performance, it has additional vibration isolation capability, and its structure is simple. By increasing the cross-sectional area of ​​the support components, it ensures that it has sufficient load-bearing capacity.

[0005] To achieve the above objectives, the present invention provides the following solution: a floating slab track vibration isolator for rail transit, comprising:

[0006] The steel frame, as the main body of the vibration isolator, is used to provide support stiffness;

[0007] A rotating mass block is used to absorb vertical loads on the vibration isolator.

[0008] A rubber connecting ring is used to control the rotational motion of the rotating mass block.

[0009] Preferably, the steel frame is a hollow cage structure, the rotating mass block is placed inside the steel frame, and the rotating mass block is connected to the steel frame through the rubber connecting ring.

[0010] Preferably, the steel frame includes a first rib ring and a second rib ring, both of which are circular ring structures, and the first rib ring and the second rib ring are of equal size.

[0011] Preferably, the steel frame further includes several steel beams, which are evenly arranged in an arc-shaped spiral pattern between the first rib ring and the second rib ring.

[0012] Preferably, all of the steel beams are made of mechanical metamaterials, and the spacing between any two adjacent steel beams is equal.

[0013] Preferably, the rotating mass block is a cylindrical structure, with its upper and lower ends corresponding to the top and bottom ends of the steel frame, respectively.

[0014] Preferably, the rubber connecting rings are respectively disposed at the top and bottom ends of the steel frame, and are circular in shape, with two rings provided.

[0015] Preferably, the inner diameter of the rubber connecting ring is larger than the inner diameter of the rotating mass block, and smaller than the inner diameters of the first and second rib rings in the steel frame.

[0016] According to the specific technical solution provided by the present invention, the present invention discloses the following technical effects:

[0017] This invention provides a floating slab track vibration isolator for rail transit. In this isolator, the steel frame is a hollow cage structure, and a rotating mass is placed inside the steel frame. The rotating mass is connected to the steel frame via rubber connecting rings. When a vertical load caused by train operation is applied to the isolator, the steel frame undergoes torsional deformation. Simultaneously, the rubber connecting rings drive the rotating mass to rotate, transferring some energy to the rotating mass, thereby achieving vibration isolation. Because the vibration isolator provided by this invention has additional compressive-torsional coupling performance, it possesses additional vibration isolation capacity. Furthermore, its structure is simple, and by increasing the cross-sectional area of ​​the supporting components, sufficient load-bearing capacity is ensured. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a chiral superstructure vibration isolator in the prior art;

[0020] Figure 2 A schematic diagram of the overall structure of a floating slab track vibration isolator for rail transit according to the present invention;

[0021] Figure 3 This is a schematic diagram of the steel frame structure provided by the floating slab track vibration isolator for rail transit according to the present invention;

[0022] Figure 4 This is a schematic diagram of the rotating mass block provided by the floating slab track vibration isolator for rail transit according to the present invention.

[0023] Figure 5 This is a schematic diagram of the upper and lower rubber connecting rings provided by a floating slab track vibration isolator for rail transit according to the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of the vibration isolator under vertical load and undergoing compressive-torsional deformation, as provided in Embodiment 1 of the present invention.

[0025] Figure 7 The force-displacement curve of the vibration isolator in Embodiment 1 of the present invention;

[0026] Figure 8 The force transmission rate curve of the vibration isolator in Embodiment 1 of the present invention;

[0027] Figure 9 This is a bar chart showing the insertion loss of the vertical acceleration of the tunnel wall during driving in Embodiment 1 of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Steel frame, 11-First stiffening ring, 12-Second stiffening ring, 13-Steel beam, 2-Rotating mass block, 3-Rubber connecting ring. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides a floating slab track vibration isolator for rail transit. In this isolator, the steel frame is a hollow cage structure, and a rotating mass is placed inside the steel frame. The rotating mass is connected to the steel frame via rubber connecting rings. When a vertical load caused by train operation is applied to the isolator, the steel frame undergoes torsional deformation. Simultaneously, the rubber connecting rings drive the rotating mass to rotate, transferring some energy to the rotating mass, thereby achieving vibration isolation. Because the vibration isolator provided by this invention has additional compressive-torsional coupling performance, it possesses additional vibration isolation capacity. Furthermore, its structure is simple, and by increasing the cross-sectional area of ​​the supporting components, sufficient load-bearing capacity is ensured.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] Reference Figures 2-5 This invention provides a floating slab track vibration isolator for rail transit, comprising:

[0035] The steel frame 1 serves as the main body of the vibration isolator, providing support stiffness.

[0036] Rotating mass block 2 is an oscillator used to absorb the vertical load on the vibration isolator;

[0037] Rubber connecting ring 3 is used to control the rotational motion of the rotating mass block.

[0038] In the above structure, the steel frame 1 is a hollow cage-like structure, and the rotating mass block 2 is placed inside the steel frame 1. The rotating mass block 2 is connected to the steel frame 1 through a rubber connecting ring 3. The steel frame 1 includes a first rib ring 11 and a second rib ring 12, both of which are circular ring structures and are of equal size. The steel frame 1 also includes several steel beams 13, which are evenly arranged in an arc-shaped spiral pattern between the first rib ring 11 and the second rib ring 12. All steel beams 13 are made of a mechanical metamaterial, and the spacing between any two adjacent steel beams 13 is equal.

[0039] In addition, the rotating mass block 2 is a cylindrical structure, with its upper and lower ends corresponding to the top and bottom ends of the steel frame 1, respectively. Two rubber connecting rings 3 are respectively installed at the top and bottom ends of the steel frame 1. The inner diameter of the rubber connecting ring 3 is larger than the inner diameter of the rotating mass block 2, but smaller than the inner diameters of the first rib ring 11 and the second rib ring 12 in the steel frame 1.

[0040] The material parameters of the steel frame, rotating mass block, and rubber connecting ring are shown in Table 1.

[0041] Table 1 Material Parameters

[0042]

[0043] Based on the material parameters and structural composition of each part in Table 1, a vertical load is applied to the obtained vibration isolator, and the deformation structure of the vibration isolator is as follows. Figure 6 As shown, Figure 6 (a) is a schematic diagram of the deformation of a three-dimensional structure under vertical load. Figure 6 (b) is a frontal schematic diagram of the vibration isolator deforming under vertical load. From Figure 6 It can be clearly seen that when the vibration isolator is subjected to a vertical load, it deforms in the vertical direction, causing the vibration isolator structure to twist. At the same time, the rubber connecting ring drives the entire rotating mass block to rotate, so as to achieve vibration isolation.

[0044] In addition, the vertical stiffness of the vibration isolator provided in this embodiment was tested, and the results were as follows: Figure 7 The results are shown. Under the application of different forces, the location of the vibration isolator under different forces is calculated. Considering geometric nonlinearity, it can be obtained from... Figure 7 The force-displacement curve of the vibration isolator is basically a straight line, and its vertical stiffness is about 6.2 kN / mm, which is similar to the vertical stiffness of the steel spring vibration isolator in the prior art.

[0045] In this embodiment, a unit load is also applied to the top of the vibration isolator, and the reaction force at its bottom is calculated, resulting in the following: Figure 8 The graph shows the force transmissibility. The dashed line represents the effect of a steel spring; the portion above 0 (0-55.4Hz) indicates a lower performance than a steel spring. Above 55.4Hz, the transmissibility drops below 0dB, indicating better performance than a steel spring. The better performance is due to the vibration absorption effect of the high-speed rotating mass. According to vibration absorption theory, the vibration absorber inevitably generates new resonance peaks while functioning, resulting in a range above 0dB. Overall, the frequency range where vibration isolation capability is improved is much wider than the negative frequency range caused by resonance.

[0046] In this embodiment, by establishing a coupled dynamic model of train-floating slab track-tunnel, the following results are obtained: Figure 9 The bar chart shown is calculated as follows:

[0047] Insertion loss =

[0048] Where 'a' represents acceleration;

[0049] The calculations and the resulting bar charts show that the vibration isolator provided in this embodiment outperforms the ordinary steel spring vibration isolator.

[0050] Therefore, this invention employs the aforementioned floating slab track vibration isolator for rail transit. In this isolator, the steel frame is a hollow cage structure, and a rotating mass block is placed inside the steel frame. The rotating mass block is connected to the steel frame via rubber connecting rings. When the vertical load caused by train operation is applied to the isolator, the steel frame undergoes torsional deformation. Simultaneously, the rubber connecting rings drive the rotating mass block to rotate, transferring a portion of the energy to the rotating mass block, thereby achieving vibration isolation. Because the vibration isolator provided by this invention has additional compressive-torsional coupling performance, it possesses additional vibration isolation capability. Furthermore, its structure is simple, and by increasing the cross-sectional area of ​​the supporting components, sufficient load-bearing capacity is ensured.

[0051] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0052] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A floating slab track vibration isolator for rail transit, characterized in that, include: The steel frame, as the main body of the vibration isolator, is used to provide support stiffness; A rotating mass block is used to absorb vertical loads on the vibration isolator. A rubber connecting ring is used to control the rotational motion of the rotating mass block; The steel frame is a hollow cage-like structure, and the rotating mass block is placed inside the steel frame. The rotating mass block is connected to the steel frame through the rubber connecting ring. The steel frame includes a first rib ring and a second rib ring. Both the first rib ring and the second rib ring are circular ring structures, and the first rib ring and the second rib ring are of equal size. The steel frame also includes several steel beams, which are evenly arranged in an arc-shaped spiral pattern between the first and second reinforcing rings; all the steel beams are made of mechanical metamaterials, and the spacing between any two adjacent steel beams is equal.

2. A floating slab track vibration isolator for rail transit according to claim 1, characterized in that, The rotating mass block is a cylindrical structure, with its upper and lower ends corresponding to the top and bottom ends of the steel frame, respectively.

3. A floating slab track vibration isolator for rail transit according to claim 1, characterized in that, The rubber connecting rings are respectively disposed at the top and bottom of the steel frame, and are circular in shape, with two rings in total.

4. A floating slab track vibration isolator for rail transit according to claim 1, characterized in that, The inner diameter of the rubber connecting ring is larger than the inner diameter of the rotating mass block, but smaller than the inner diameters of the first and second rib rings in the steel frame.

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