A kind of bionic X type shock absorber is used for floating slab track vibration isolation system

Abstract

The application discloses a kind of bionic X-type shock absorber for floating slab track vibration isolation system, including rail plate and X-type shock absorber, the rail plate bottom is provided with several X-type shock absorber, the X-type shock absorber includes two central beams, two ends of the central beam are connected with double rhombic elastic link frame respectively, tension spring assembly is arranged between the double rhombic elastic link frame and the central beam, damper assembly is arranged on the double rhombic elastic link frame, and central vertical spring is arranged between the two central beams.The application solves the problem of vibration amplification under the critical frequency of traditional floating slab by adopting bionic X-type double rhombic elastic link frame, and significantly improves the low-frequency damping efficiency.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction and noise reduction technology in rail transit, and in particular to a biomimetic X-type vibration damper for use in a floating slab track vibration prevention system. Background Technology

[0002] With the continuous expansion of urban rail transit networks, environmental vibration has become an increasingly prominent critical issue. During subway operation, vibrations generated by wheel-rail interaction are transmitted through the track structure to bridges and tunnels, and further propagated through the soil to adjacent buildings. Such vibrations have adverse effects on both outdoor and indoor environments. Low-frequency vibrations, due to their long wavelengths and high penetrability, pose significant hazards: they can negatively impact human health, weaken the structural stability of historical buildings, and affect the normal operation of precision equipment and other sensitive instruments. Therefore, controlling subway-induced low-frequency vibrations is one of the key technical challenges for achieving the sustainable development of urban rail transit.

[0003] Floating slab tracks are one of the most commonly used vibration control measures in current urban rail transit systems. By weakening the track support stiffness, floating slab tracks effectively reduce the transmission of train vibrations to the surrounding environment, and are therefore often deployed in areas highly sensitive to vibration. However, their vibration isolation effect is mainly limited to frequencies above the critical isolation frequency, while vibration amplification easily occurs below the critical frequency. Therefore, the difficulty in effectively suppressing low-frequency responses continues to constrain the further development and upgrading of related technologies.

[0004] From a biomechanical perspective, biomimetic structures have demonstrated remarkable potential in low-frequency vibration control, with the biomimetic X-shaped mechanism being the most representative example, exhibiting typical negative Young's modulus characteristics. Unlike other biomimetic structures, the X-shaped mechanism can achieve amplitude amplification by adjusting the linkage angle, further enhancing the low-frequency control efficiency of the vibration isolator. Furthermore, from a structural perspective, the geometric features of the X-shaped structure significantly reduce space occupation and improve structural integration, making it particularly suitable for installations in confined spaces such as subways. Summary of the Invention

[0005] To address the shortcomings of current technology, this invention proposes a biomimetic X-shaped vibration damper for use in a floating slab track vibration damping system, thereby solving the problems mentioned in the background.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a biomimetic X-type vibration damper for a floating slab track vibration damping system, comprising a rail slab and an X-type vibration damper; The bottom of the rail plate is provided with several X-shaped vibration dampers; The X-type shock absorber includes two central crossbeams, and the two ends of the central crossbeams are respectively connected to a double rhomboid elastic linkage frame. A tension spring assembly is provided between the double-rhomboid elastic linkage frame and the central crossbeam. A damper assembly is provided on the double-rhomboid elastic linkage frame. A central vertical spring is provided between the two central crossbeams.

[0007] Furthermore, the double-rhomboid elastic linkage frame is composed of an upper single-opening rod, an upper double-opening rod, a lower double-opening rod, and a lower single-opening rod hinged together. The two central crossbeams are the upper central crossbeam and the lower central crossbeam, and both ends of the upper central crossbeam and the lower central crossbeam are provided with beam plate bolt holes; one end of the textured pin is inserted into the beam plate bolt hole and locked by the thread. One end of the upper single-opening rod and one end of the upper double-opening rod are connected together to the textured pin hinge of the upper central crossbeam. The other end of the upper single-opening rod and one end of the lower double-opening rod are connected by a pin hinge. The other end of the upper double-opening rod is connected to one end of the lower single-opening rod by a pin to achieve a limited hinge connection. The damper assembly is equipped with a connecting cylinder; The connecting cylinder is mounted on the pin between the upper single-opening rod and the lower double-opening rod; The other end of the lower single-opening rod and the other end of the lower double-opening rod are connected together to the textured pin hinge of the lower central crossbeam.

[0008] Furthermore, a second through hole is provided at one end of the pin, and a first through hole is also provided on the side of the pin near the second through hole; Both the upper and lower central crossbeams are equipped with beam plates; the tension spring assembly includes a first tension spring and a second tension spring. One end of the first tension spring is used to connect with the beam plate, and the other end of the first tension spring is used to connect with the second through hole. One end of the second tension spring is used to connect with the second through hole, and the other end of the second tension spring is used to connect with the beam plate of the lower central crossbeam.

[0009] Furthermore, the pin is provided with an anti-loosening nut, and the anti-loosening nut has a third through hole, through which the fixing screw is used to pass.

[0010] Furthermore, the upper single-opening type member includes an upper connecting plate, a middle connecting plate, and a lower connecting plate; one end of the upper connecting plate is used to be hinged to the textured pin of the upper central crossbeam, the other end of the upper connecting plate is connected to the middle connecting plate, the other end of the middle connecting plate is connected to the lower connecting plate, and the other end of the lower connecting plate is hinged to the pin.

[0011] Furthermore, the upper connecting plate includes an upper plate connecting port, a bottom through cavity, a side opening, an insert plate, and a first spring; one end of the upper connecting plate has an upper plate connecting port, which is used to connect with the textured pin of the upper central crossbeam via a hinge; the upper connecting plate has a bottom through cavity; both sides of the upper connecting plate have side openings; the bottom through cavity is used to accommodate one end of the middle connecting plate for insertion and sliding adaptation; the side opening is used for the insert plate to extend out and cooperate with the through insertion port of the middle connecting plate; and the side opening is provided with a first spring.

[0012] Furthermore, the middle connecting plate includes a through-hole, a middle plate bolt hole, a plug, a plug block, and a second spring; the through-hole is located on both sides of one end of the middle connecting plate for insertion and engagement with the plug plate of the upper connecting plate, and the middle connecting plate is provided with a second spring at one end; the other end of the middle connecting plate has a middle plate bolt hole and a plug block for engaging and positioning with the groove of the lower connecting plate, and the middle plate bolt hole is used to achieve a detachable and fixed connection between the middle connecting plate and the lower connecting plate through the plug.

[0013] Furthermore, the lower connecting plate includes a groove, lower plate bolt holes, and a lower plate connection port; one end of the lower connecting plate has two lower plate bolt holes, and a groove is also provided between the two lower plate bolt holes at one end of the lower connecting plate for engaging with the insert block. The lower plate bolt holes are used to align with the middle plate bolt holes and are locked by bolts. The other end of the lower connecting plate has a lower plate connection port for connecting with the pin hinge.

[0014] Furthermore, the double-diamond elastic linkage frame exhibits an approximately hexagonal profile.

[0015] Furthermore, an epoxy resin elastic pad is provided between the X-type vibration damper and the rail plate, and the X-type vibration damper is arranged along the longitudinal direction of the rail.

[0016] Compared with existing technologies, the present invention has the following advantages: This invention employs a biomimetic X-shaped double rhomboid elastic linkage frame, combined with a damper assembly and a double spring structure, to precisely match the vibration target point at the mid-span of the rail. By utilizing the frame amplitude amplification effect and the synergistic effect of damping energy dissipation and spring buffering, it efficiently dissipates low-frequency vibration energy, solves the problem of vibration amplification at the critical frequency of traditional floating slabs, and significantly improves low-frequency vibration reduction efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the X-type vibration damper structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the double-rhomboid elastic linkage frame structure of the present invention.

[0019] Figure 3This is a three-dimensional structural diagram of the upper single-opening rod and the lower double-opening rod of the present invention.

[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of the central crossbeam of the present invention.

[0021] Figure 5 This is a three-dimensional structural diagram of the damper assembly of the present invention.

[0022] Figure 6 This is a three-dimensional structural diagram of the first and second tension springs of the present invention.

[0023] Figure 7 This is a schematic diagram of the three-dimensional structure of the single-opening rod of the present invention.

[0024] Figure 8 This is a schematic diagram of the three-dimensional structure of the X-type vibration damper and the rail plate of the present invention.

[0025] Figure 9 The curve showing the effective Young's modulus of the X-shaped vibration isolator of the present invention varies with frequency.

[0026] Figure 10 This is a schematic diagram of the time history curve of the acceleration of the floating plate track according to the present invention.

[0027] Figure 11 This is a schematic diagram of the acceleration stage curve of the floating plate track of the present invention.

[0028] Reference numerals: 1. Central crossbeam; 101. Beam plate bolt hole; 102. Beam plate; 2. Double rhomboid elastic linkage frame; 201. Upper single-opening member; 202. Upper double-opening member; 203. Lower double-opening member; 204. Lower single-opening member; 21. Upper connecting plate; 2101. Upper plate connection port; 2102. Bottom through cavity; 2103. Side opening; 2104. Insert plate; 2105. First spring; 22. Middle connecting plate; 2201. Through insertion port; 2202. Middle plate bolt hole; 2203. Bolt. ; 2204, Insert block; 2205, Second spring; 23, Lower connecting plate; 2301, Groove opening; 2302, Lower plate bolt hole; 2303, Lower plate connection port; 3, Damper assembly; 31, Connecting cylinder; 4, Central vertical spring; 5, Tension spring assembly; 51, First tension spring; 52, Second tension spring; 6, Pin; 601, First through hole; 602, Second through hole; 7, Anti-loosening nut; 701, Third through hole; 8, Fixing screw; 9, Rail plate; 10, X-type shock absorber; 11, Textured pin. Detailed Implementation

[0029] Example 1 like Figure 1As shown, the present invention provides a technical solution: a biomimetic X-type vibration damper for a floating slab track vibration damping system, comprising a rail slab 9 and an X-type vibration damper 10; The rail plate 9 is used to support the track structure and transmit running loads and vibration energy; The bottom of the rail plate 9 is provided with a plurality of X-shaped vibration dampers 10, which are used to attenuate and buffer the vibration of the rail plate 9. The X-type vibration damper 10 includes two central crossbeams 1, and the two ends of the central crossbeams 1 are respectively connected to a double rhomboid elastic link frame 2. The double rhomboid elastic link frame 2 is used to adapt to the displacement changes during the vibration process through the elastic deformation of its own rhomboid structure. A tension spring assembly 5 is provided between the double rhomboid elastic linkage frame 2 and the central crossbeam 1. The tension spring assembly 5 is used to provide elastic restoring force during vibration and to help attenuate vibration energy. The double-rhomboid elastic link frame 2 is provided with a damper assembly 3, which is used to dissipate vibration energy during vibration and suppress vibration amplitude. A central vertical spring 4 is provided between the two central crossbeams 1. The central vertical spring 4 is used to buffer vibration and impact in the vertical direction and to provide elastic support for the central crossbeams 1.

[0030] like Figure 2-5 As shown in the figure, the double rhomboid elastic linkage frame 2 is composed of an upper single-opening rod 201, an upper double-opening rod 202, a lower double-opening rod 203, and a lower single-opening rod 204, which are hinged together. The two central crossbeams 1 are the upper central crossbeam and the lower central crossbeam, and both ends of the upper central crossbeam and the lower central crossbeam are provided with beam plate bolt holes 101; one end of the textured pin 11 is inserted into the beam plate bolt hole 101 and locked by thread. One end of the upper single-opening rod 201 and one end of the upper double-opening rod 202 are hinged together to the textured pin 11 of the upper central crossbeam. The other end of the upper single-opening rod 201 and one end of the lower double-opening rod 203 are hinged together by a pin 6. The other end of the upper double-opening rod 202 is connected to one end of the lower single-opening rod 204 by a pin 6 to achieve a limited hinge connection. The damper assembly 3 is provided with a connecting cylinder 31; The connecting cylinder 31 is mounted on the pin 6 between the upper single-opening rod 201 and the lower double-opening rod 203; The other end of the lower single-opening rod 204 and the other end of the lower double-opening rod 203 are hinged together to the textured pin 11 of the lower central crossbeam to form a complete double-rhomboid elastic deformation and damping energy dissipation structure.

[0031] like Figure 6 As shown, a second through hole 602 is provided at one end of the pin 6, and a first through hole 601 is also provided on the side of the pin 6 near the second through hole 602. Both the upper central beam and the lower central beam are provided with beam plates 102; the tension spring assembly 5 includes a first tension spring 51 and a second tension spring 52. One end of the first tension spring 51 is used to connect with the beam plate 102, and the other end of the first tension spring 51 is used to connect with the second through hole 602. One end of the second tension spring 52 is used to connect with the second through hole 602, and the other end of the second tension spring 52 is used to connect with the beam plate 102 of the lower central crossbeam.

[0032] The pin 6 is provided with a locking nut 7, and the locking nut 7 has a third through hole 701. The fixing screw 8 is used to pass through the third through hole 701 and the first through hole 601 to fix the locking nut 7 and the pin 6.

[0033] like Figure 7 As shown, the upper single-opening rod 201 includes an upper connecting plate 21, a middle connecting plate 22, and a lower connecting plate 23. One end of the upper connecting plate 21 is hinged to the textured pin 11 of the upper central crossbeam, the other end of the upper connecting plate 21 is connected to the middle connecting plate 22, the other end of the middle connecting plate 22 is connected to the lower connecting plate 23, and the other end of the lower connecting plate 23 is hinged to the pin 6. The combined structure of the upper connecting plate 21, the middle connecting plate 22, and the lower connecting plate 23 is used to realize the telescopic adjustment function to adapt to different installation spacing and vibration buffering requirements.

[0034] The upper connecting plate 21 includes an upper plate connecting port 2101, a bottom through cavity 2102, a side opening 2103, an insert plate 2104, and a first spring 2105. One end of the upper connecting plate 21 has the upper plate connecting port 2101, which is used for hinged connection with the textured pin 11 of the upper central crossbeam. The upper connecting plate 21 has a bottom through cavity 2102, and both sides of the upper connecting plate 21 have side openings 2103. The bottom through cavity 2102 is used to accommodate one end of the middle connecting plate 22 for insertion and sliding adaptation. The side opening 2103 allows the insert plate 2104 to extend and cooperate with the through insertion port 2201 of the middle connecting plate 22. The side opening 2103 contains a first spring 2105, which provides elastic restoring force to the insert plate 2104 to achieve rapid locking and unlocking of the upper connecting plate 21 and the middle connecting plate 22.

[0035] The middle connecting plate 22 includes a through-hole 2201, a middle plate bolt hole 2202, a bolt 2203, a plug 2204, and a second spring 2205. The through-hole 2201 is located on both sides of one end of the middle connecting plate 22 and is used to engage with the plug plate 2104 of the upper connecting plate 21. The second spring 2205 is provided at one end of the middle connecting plate 22. The middle plate bolt hole 2202 is provided at the other end of the middle connecting plate 22, and the plug 2204 is provided at the other end of the middle connecting plate 22 for engaging and positioning with the groove 2301 of the lower connecting plate 23. The middle plate bolt hole 2202 is used to achieve a detachable and fixed connection between the middle connecting plate 22 and the lower connecting plate 23 through the bolt 2203.

[0036] The lower connecting plate 23 includes a groove 2301, a lower plate bolt hole 2302, and a lower plate connection port 2303. One end of the lower connecting plate 23 has two lower plate bolt holes 2302, and a groove 2301 is also provided between the two lower plate bolt holes 2302 at one end of the lower connecting plate 23 for cooperating with the insert block 2204 to achieve pre-positioning in the vertical direction. The lower plate bolt holes 2302 are used to align with the middle plate bolt holes 2202 and are bolted and locked by the bolts 2203. The other end of the lower connecting plate 23 has a lower plate connection port 2303 for hinge connection with the pin 6.

[0037] Among them, the double rhomboid elastic linkage frame 2 presents an approximately hexagonal profile.

[0038] like Figure 8 As shown, an epoxy resin elastic pad is provided between the X-type vibration damper 10 and the rail plate 9, and the X-type vibration damper 10 is arranged along the longitudinal direction of the rail.

[0039] The pin 6 and the textured pin 11 are both made of medium carbon alloy steel. The pin 6 is 124 mm long and 16 mm in diameter, and the diameters of the first through hole 601 and the second through hole 602 are both 5 mm. The textured pin 11 is 120 mm long and 16 mm in diameter. The threaded section on the textured pin 11 is 15 mm long and 14 mm in diameter.

[0040] The damper assembly 3 has an overall length and width of 65mm and a height of 100mm.

[0041] The X-type shock absorber 10 has an overall length of 462mm, a total height of 567mm, and a total width of 417mm; the central vertical spring 4 has a total length of 494mm; and the epoxy resin elastic pad is a cylinder with a height of 45mm and a diameter of 500mm.

[0042] Among them, all eight tension spring assemblies 5 are made of alloy spring steel, which enables the tension spring assemblies 5 to adapt to the dynamic load fluctuations of the track and to be symmetrically distributed.

[0043] Workflow: When the train is running, the wheel and rail will generate low-frequency vibrations. These low-frequency vibrations are first transmitted to the rail plate 9. After the rail plate 9 bears the vibration energy, the epoxy resin elastic pad at the bottom of the rail plate 9 (initially buffering the vibration) drives the upper central crossbeam of the X-type vibration damper 10 to move downwards, thus officially starting the entire transmission and vibration damping process. When the upper central crossbeam moves downward, the textured pin 11 of the upper central crossbeam drives the upper single-opening rod 201 and the upper double-opening rod 202, which are hinged to the upper single-opening rod 201, to rotate around the textured pin 11, thereby changing the original connecting rod angle of the double rhomboid elastic connecting rod frame 2, realizing the geometric transmission of vibration displacement and amplitude amplification (which matches the negative Young's modulus characteristics of the biomimetic X-type mechanism). When the upper single-opening rod 201 and the upper double-opening rod 202 rotate around the textured pin 11, the lower double-opening rod 203 and the lower single-opening rod 204 of the double-rhomboid elastic link frame 2 rotate synchronously through the pin 6, so that the entire double-rhomboid elastic link frame 2 presents an elastic deformation of an approximately hexagonal contour, thereby adapting to the displacement changes during the vibration process; at the same time, the deformation of the double-rhomboid elastic link frame 2 will drive the internal structure of the damper assembly 3 installed on the pin 6 to generate relative motion, and use the viscous resistance or friction of the damping medium to convert the mechanical energy generated by the vibration into heat energy dissipation, thereby suppressing the expansion of the vibration amplitude; During the deformation of the double rhomboid elastic link frame 2, a tensile or compressive force is generated on the tension spring assembly 5 connected between the second through hole 602 of the pin 6 and the upper and lower central crossbeams, thereby causing the tension spring assembly 5 to undergo elastic deformation. When the tension spring assembly 5 deforms, it accumulates elastic potential energy and generates a reverse elastic restoring force. The elastic restoring force drives the double rhomboid elastic link frame 2 back to its initial position, helping to attenuate the remaining vibration energy and prevent the vibration from continuing to accumulate. At the same time, as the upper central crossbeam moves downward, it directly causes the central vertical spring 4 located between the two central crossbeams 1 to be vertically compressed. The central vertical spring 4 buffers the vertical vibration impact through its own elastic deformation, and at the same time accumulates elastic potential energy. When the vibration impact force weakens, the central vertical spring 4 releases the accumulated potential energy, generates an upward elastic support force, and drives the upper central crossbeam to return to its original position, further offsetting the transmission of low-frequency vibration in the vertical direction.

[0044] Assembly principle of single open-type rod 201: The upper single-opening type rod 201 is assembled sequentially from the upper connecting plate 21, the middle connecting plate 22, and the lower connecting plate 23. The structural coordination logic of each component is as follows: The assembly of the upper connecting plate 21 and the middle connecting plate 22 is as follows: First, insert one end of the middle connecting plate 22 into the bottom through cavity 2102. When one end of the middle connecting plate 22 is inserted to the corresponding position of the bottom through cavity 2102, the second spring 2205 of the middle connecting plate 22 contacts the inner wall of the bottom through cavity 2102. Insert one end of the insert plate 2104 into the through insertion port 2201 from the side opening 2103. At this time, both ends of the insert plate 2104 are exposed at both ends of the side opening 2103. The first spring 2105 always applies a horizontal elastic restoring force to the insert plate 2104 at both ends of the side opening 2103. When the insert plate 2104 is under force, it can move horizontally along the side opening 2103. To unlock, pull the insert plate 2104 out of the through-hole 2201 through the side opening 2103, and pull the middle connecting plate 22 out of the bottom through-hole 2102. A second spring 2205 is provided at one end of the middle connecting plate 22 to prevent the middle connecting plate 22 from being damaged by collision during installation with the bottom through cavity 2102, thus providing a protective effect. The assembly of the middle connecting plate 22 and the lower connecting plate 23 is as follows: First, insert the plug 2204 at the other end of the middle connecting plate 22 into the groove 2301 at one end of the lower connecting plate 23. Through the engagement of the plug 2204 and the groove 2301, the middle connecting plate 22 and the lower connecting plate 23 are pre-positioned in the vertical direction (to avoid misalignment during assembly). Then, rotate and screw the bolt 2203 into the bolt holes 2202 of the middle plate and 2302 of the lower plate to fix the middle connecting plate 22 and the lower connecting plate 23.

[0045] The insert 2204 of the middle connecting plate 22 engages with the groove 2301 of the lower connecting plate 23, achieving pre-positioning in the vertical direction and preventing misalignment between the middle connecting plate 22 and the lower connecting plate 23 during assembly. Subsequently, the bolts 2203 are screwed into the bolt holes 2202 of the middle plate and 2302 of the lower plate, further enhancing the connection rigidity. This structure can stably bear the loads generated by the rotation of the rods and the deformation of the double-rhomboid elastic connecting rod frame 2 during vibration reduction, while also preventing loosening under vibration conditions. This ensures the structural stability of the double-rhomboid elastic connecting rod frame 2 of the X-type vibration damper, thereby maintaining the reliability of the vibration reduction effect.

[0046] Among them, a floating slab track analysis model with a biomimetic X-shaped vibration damper was established in finite element software, such as... Figure 9 As shown; based on the basic characteristics of the finite element method, the corresponding response and deformation characteristics can be obtained by solving the basic dynamic equations. Existing commercial finite element software integrates all calculation modules and realizes the solution of various problems through interface operation. Therefore, the mathematical framework of finite element software will not be elaborated here. In dynamic analysis, the equivalent elastic modulus (an equivalent mechanical parameter) is an important parameter describing the dynamic characteristics of the biomimetic X-type vibration damper. The relationship between the biomimetic X-type vibration damper and frequency is as follows: Figure 9 As shown: First, a fixed load analysis was performed on the bionic X-type vibration damper in the finite element software, focusing on the equivalent stiffness characteristics of the bionic X-type vibration damper. The results are as follows. Figure 9 As shown: In the frequency range of 0 to 9.1 Hz: the equivalent elastic modulus gradually decreases from about 1.0 to close to 0, and remains positive; In the frequency range of 9.1~10.0 Hz: the equivalent elastic modulus drops sharply from near 0 to -10, showing a negative value; At 10 Hz: the equivalent elastic modulus undergoes a sudden change, corresponding to the resonance frequency of the biomimetic X-type vibration damper. Due to the resonance effect of the double rhomboid elastic link frame 2, Young's modulus diverges. In the frequency range of 10~20 Hz: the equivalent elastic modulus gradually decreases from about 10 to about 1.2, and then tends to stabilize and remain positive.

[0047] It can be seen that the effective Young's modulus of the biomimetic X-type vibration damper proposed in this invention exhibits a negative value in the frequency range of 9.1-10.0 Hz, while remaining positive in other frequency ranges. This result fully demonstrates the potential of the biomimetic X-type vibration damper proposed in this invention for low-frequency control. At the same time, the damper assemblies 3 configured on both sides of the double-rhomboid elastic linkage frame 2 exhibit a wide effective operating frequency band in the low-frequency region. In summary, the negative stiffness reflects the metamaterial properties of the biomimetic X-type vibration damper, while the frequency band expansion is mainly driven by the amplitude amplification mechanism, thereby significantly enhancing the performance of the biomimetic X-type vibration damper.

[0048] The moving load analysis of the floating slab track structure was continued in the finite element software, focusing on the time-frequency domain dynamic response characteristics of the floating slab track structure. The results are as follows: Figure 10 , Figure 11 As shown; Depend on Figure 10 It can be seen that within the time history of 0~3.0s, the acceleration of the floating plate exhibits a multi-peak decay characteristic over time: Ordinary floating slab (solid line): Maximum peak vibration acceleration 1.24 m / s² 2 ; Floating plate equipped with biomimetic X-shaped vibration dampers (dotted line): Maximum peak vibration acceleration 1.12 m / s² 2 m / s 2 It is a unit of acceleration; After the introduction of the biomimetic X-type vibration isolator, the acceleration of the floating slab was significantly reduced, with its peak value decreasing from 1.24 m / s² to 1.12 m / s², a reduction of approximately 9.68%. This result preliminarily demonstrates the effectiveness of the biomimetic X-type vibration isolator in improving the low-frequency vibration isolation performance of the floating slab track.

[0049] In the study of wheel-rail dynamic interaction and vibration propagation to the surrounding foundation in urban rail transit systems, one-third octave band analysis is a crucial and comprehensive evaluation method. This method accurately characterizes low-frequency vibration behavior and aligns with the vibration perception characteristics of humans and structures. Therefore, further integration with... Figure 11 The frequency domain response results are used to conduct an in-depth evaluation of the performance of the biomimetic X-type vibration isolator.

[0050] Depend on Figure 11 It can be seen that within the 1 / 3 octave band center frequency range of 1.00~31.50 Hz: For a typical floating slab (solid line): the vibration acceleration level reaches its peak at approximately 121 dB in the 6.3–8.0 Hz frequency range; it exhibits varying degrees of attenuation in the 3.15 Hz and 12.5–31.5 Hz frequency ranges. dB is the unit of decibel, used here to represent the vibration acceleration level. Floating plate equipped with biomimetic X-shaped vibration dampers (dashed line): The vibration acceleration level is lower than that of ordinary floating plates across the entire frequency range, especially in the key frequency range: In the frequency range of 6.3~12.5 Hz: the vibration acceleration level of the floating plate decreased significantly, with a maximum attenuation of 5.82 dB (for example, near 8.0 Hz, the vibration acceleration level decreased from about 121 dB to about 115 dB), further demonstrating that the biomimetic X-type vibration isolator has excellent vibration reduction performance in the low frequency range.

[0051] In the 12.5~31.5 Hz frequency range: even in the mid-to-high frequency range, the vibration acceleration level response of the floating plate shows a significant attenuation (e.g. in the 16.0~20.0 Hz frequency range, the vibration acceleration level drops from about 113 dB to about 111 dB).

[0052] After installing the biomimetic X-type vibration isolator, the vibration level of the floating slab was significantly reduced over a wide frequency range, fully demonstrating its superior frequency response characteristics. Furthermore, because the biomimetic X-type vibration isolator exhibits a large equivalent dynamic mass, it improves the overall effective mass of the floating slab. Therefore, the biomimetic X-type vibration isolator effectively expands the control bandwidth for mid- and high-frequency frequencies while improving low-frequency vibration isolation.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biomimetic X-shaped vibration damper for use in a floating slab track vibration damping system, characterized in that, Including rail plates and X-type vibration dampers; The bottom of the rail plate is provided with several X-shaped vibration dampers; The X-type shock absorber includes two central crossbeams, and the two ends of the central crossbeams are respectively connected to a double rhomboid elastic linkage frame. A tension spring assembly is provided between the double-rhomboid elastic linkage frame and the central crossbeam. A damper assembly is provided on the double-rhomboid elastic linkage frame. A central vertical spring is provided between the two central crossbeams.

2. The biomimetic X-type vibration damper for use in a floating slab track vibration damping system according to claim 1, characterized in that: The double-rhomboid elastic linkage frame is composed of an upper single-opening member, an upper double-opening member, a lower double-opening member, and a lower single-opening member hinged together. The two central crossbeams are the upper central crossbeam and the lower central crossbeam, and both ends of the upper central crossbeam and the lower central crossbeam are provided with beam plate bolt holes; one end of the textured pin is inserted into the beam plate bolt hole and locked by the thread. One end of the upper single-opening rod and one end of the upper double-opening rod are connected together to the textured pin hinge of the upper central crossbeam. The other end of the upper single-opening rod and one end of the lower double-opening rod are connected by a pin hinge. The other end of the upper double-opening rod is connected to one end of the lower single-opening rod by a pin to achieve a limited hinge connection. The damper assembly is equipped with a connecting cylinder; The connecting cylinder is mounted on the pin between the upper single-opening rod and the lower double-opening rod; The other end of the lower single-opening rod and the other end of the lower double-opening rod are connected together to the textured pin hinge of the lower central crossbeam.

3. The biomimetic X-type vibration damper for use in a floating slab track vibration damping system according to claim 2, characterized in that: A second through hole is provided at one end of the pin, and a first through hole is also provided on the side of the pin near the second through hole; Both the upper and lower central crossbeams are equipped with beam plates; the tension spring assembly includes a first tension spring and a second tension spring. One end of the first tension spring is used to connect with the beam plate, and the other end of the first tension spring is used to connect with the second through hole. One end of the second tension spring is used to connect with the second through hole, and the other end of the second tension spring is used to connect with the beam plate of the lower central crossbeam.

4. The biomimetic X-type vibration damper for use in a floating slab track vibration damping system according to claim 3, characterized in that: The pin is equipped with a lock nut, and the lock nut has a third through hole. The fixing screw is used to pass through the third through hole and the first through hole.

5. A biomimetic X-type vibration damper for a floating slab track vibration damping system according to claim 4, characterized in that: The single-opening type member includes an upper connecting plate, a middle connecting plate, and a lower connecting plate; one end of the upper connecting plate is used to connect with the textured pin hinge of the upper central crossbeam, the other end of the upper connecting plate is connected to the middle connecting plate, the other end of the middle connecting plate is connected to the lower connecting plate, and the other end of the lower connecting plate is connected to the pin hinge.

6. A biomimetic X-type vibration damper for a floating slab track vibration damping system according to claim 5, characterized in that: The upper connecting plate includes an upper plate connecting port, a bottom through cavity, a side opening, an insert plate, and a first spring. The upper connecting plate has an upper plate connecting port at one end, which is used to connect with the textured pin of the upper central crossbeam via a hinge. The upper connecting plate has a bottom through cavity, and side openings are provided on both sides of the upper connecting plate. The bottom through cavity is used to accommodate one end of the middle connecting plate for insertion and sliding adaptation. The side openings are used for the insert plate to extend out and cooperate with the through insertion port of the middle connecting plate. The first spring is provided inside the side openings.

7. A biomimetic X-type vibration damper for a floating slab track vibration damping system according to claim 6, characterized in that: The middle connecting plate includes a through-hole, a middle plate bolt hole, a plug, a plug block, and a second spring. The through-hole is located on both sides of one end of the middle connecting plate and is used to engage with the plug plate of the upper connecting plate. The middle connecting plate has a second spring at one end. The other end of the middle connecting plate has a middle plate bolt hole and a plug block, which is used to engage with the groove of the lower connecting plate for positioning. The middle plate bolt hole is used to fix the middle connecting plate and the lower connecting plate together through the plug.

8. A biomimetic X-type vibration damper for a floating slab track vibration damping system according to claim 7, characterized in that: The lower connecting plate includes a groove, lower plate bolt holes, and a lower plate connection port. Two lower plate bolt holes are provided at one end of the lower connecting plate, and a groove is also provided between the two lower plate bolt holes at one end of the lower connecting plate for mating with the insert block. The lower plate bolt holes are used to align with the middle plate bolt holes and are locked by bolts. The other end of the lower connecting plate has a lower plate connection port for connecting with the pin hinge.

9. A biomimetic X-type vibration damper according to claim 8 for use in a floating slab track vibration damping system, characterized in that: The double-diamond elastic linkage frame has an approximately hexagonal profile.

10. A biomimetic X-type vibration damper for a floating slab track vibration damping system according to claim 9, characterized in that: An epoxy resin elastic pad is provided between the X-type vibration damper and the rail plate. The X-type vibration damper is arranged along the longitudinal direction of the rail.

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