Buoyant raft type vibration isolation and sound insulation structure of motor train unit floor system and method of buoyant raft type vibration isolation and sound insulation structure

Abstract

The invention relates to the technical field of rail transit, and discloses a buoyant raft type vibration isolation and sound insulation structure of a motor train unit floor system and a method thereof.The buoyant raft type vibration isolation and sound insulation structure comprises passenger seats, first suspenders and water fenders, the passenger seats are arranged at the lower ends of seat supporting legs, and vibration isolation installation is formed by rubber vibration isolators and vehicle body floor profiles; the passenger seat forms a first-stage vibration isolation system, a seat installation plate is installed at the lower end of the passenger seat, and a vibration isolator installation seat is installed on the seat installation plate in a bolt mode. According to the buoyant raft type vibration isolation and sound insulation structure of the motor train unit floor system and the method of the buoyant raft type vibration isolation and sound insulation structure, the seat of the motor train unit and the passenger room floor are subjected to floating construction design based on the buoyant raft double-layer vibration isolation principle, so that the vibration isolation and sound insulation performance of the motor train unit floor system is effectively improved; sound and vibration transmission of wheel track sound and vibration excitation to the interior of a passenger room through the cross section of the floor is more efficiently restrained, and the noise comfort of a motor train unit is improved.

Description

Technical Field

[0001] This invention relates to the field of rail transit technology, specifically to a floating raft-type vibration isolation and sound insulation structure and method for a high-speed train floor system. Background Technology

[0002] Noise comfort inside high-speed trains is one of the important performance indicators. The increasing speed and weight reduction of trains have posed challenges to noise control. Currently, the noise level inside high-speed trains in my country at speeds of 350 km / h reaches 73 dB(A). The latest tested CR450 high-speed train reached over 75 dB(A) at a speed of 350 km / h, and this high noise level seriously affects passenger comfort.

[0003] High-speed trains are subjected to complex external excitations of vibration and noise during operation. Existing research has shown that, compared to areas such as the roof, side walls, and end walls, the floor area is the primary source of sound and vibration transmission within the train. Therefore, vibration isolation and sound insulation of the floor system are of paramount importance for controlling noise within the train.

[0004] Currently, the common method for noise control in high-speed trains is to use a floating design for the interior systems. Specifically, this involves mounting the interior panels of the passenger compartment floor and side walls to the car body structure using elastic vibration dampers for sound insulation. This elastic installation is a simple single-layer vibration isolation, while the car body structure and passenger compartment floor structure form a double-layer plate structure with elastic connection for sound insulation. However, under stronger acoustic excitation, the vibration and sound insulation performance of this traditional floating design is insufficient, making it difficult to meet the required noise levels inside the train. Therefore, there is an urgent need for a floating raft-type vibration and sound insulation structure and method for the high-speed train floor system to solve these problems. Summary of the Invention

[0005] The purpose of this invention is to provide a floating raft-type vibration isolation and sound insulation structure and method for a high-speed train floor system, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A floating raft-type vibration isolation and sound insulation structure for a high-speed train floor system includes a passenger seat, a first suspension rod, and a water baffle. The passenger seat is located at the lower end of the seat support leg and is installed with the car body floor profile through a rubber vibration isolator to form a vibration isolation system. The passenger seat forms the first-level vibration isolation system. A seat mounting plate is installed at the lower end of the passenger seat, and the vibration isolator mounting bracket is installed on the seat mounting plate by bolts. The lower end of the first suspension rod is connected to the passenger compartment floor, and the upper end is connected to the passenger seat through a rubber vibration isolator and a vibration isolator mounting base. The passenger compartment floor is suspended under the passenger seat, and the passenger compartment floor forms a second level of vibration isolation. The air cavity between the passenger compartment floor and the vehicle body floor profile is filled with porous or fibrous sound-absorbing material to reduce airborne sound transmission. The seat legs are fitted with rubber sealing sleeves, and the lower end of the rubber sealing sleeves is sealed and bonded to the passenger compartment floor with sealant. The seat leg is equipped with a highly elastic rubber sealing ring, and the inner and outer surfaces of the rubber sealing ring are bonded to the seat leg and the passenger compartment floor with sealant. The upper end of the water baffle is connected to the side wall profile and interior panel of the vehicle body by a second bolt, and the lower end is sealed and inserted with a rubber sealing strip, which is then sealed and bonded to the passenger compartment floor. The passenger compartment floor is sealed and bonded to the side wall profile of the vehicle body at the end near the side wall by a rubber sealing strip; The passenger room floor is elastically mounted on the side wall profile at the end near the side wall via a second hanger, a rubber vibration isolator, and a side wall vibration isolator mounting base, forming a vibration isolation installation. The passenger seat forms a floating floor vibration and sound insulation system through elastic connectors at the seat legs, elastic connectors at the side walls, and elastic connectors at the lower end of the passenger seat and the lower end of the seat to the passenger compartment floor.

[0007] Preferably, the interior of the guest room is formed by splicing together multiple pieces of guest room flooring, and the joints between the guest room flooring pieces are sealed.

[0008] Preferably, the lower end of the rubber vibration isolator is fitted with a first bolt.

[0009] Preferably, a water baffle plate is installed at the upper end of the rubber sealing strip.

[0010] A floating raft-type vibration isolation and sound insulation method for a high-speed train floor system, the method comprising the following steps: Step 1: The seats and passenger compartment floor are connected by vibration isolation to form a floating raft-type vibration isolation system. Treating both as concentrated masses, their dynamic equations can be written as follows: (1) (2); Step 2: Assume the vibration acceleration form of the floor profile. (3) in The amplitude of the vibration displacement. Angular frequency, For time; The vibration displacement transmissibility of the passenger room floor is derived. (4) Step 3: If the guest room floor is installed directly and flexibly onto the floor profile using the traditional floor support method, then the guest room floor is a single-stage vibration isolation system, and its vibration transmission rate is: (5) Step 4: Calculate the sound insulation characteristics of the floor cross section using the finite element method.

[0011] Preferably, in step one and These represent the quality of the passenger compartment floor and seats, respectively. , , These are the vibration displacements of the passenger floor, seats, and floor profiles, respectively. and These are the vibration isolation stiffness of the passenger compartment floor and seats, respectively.

[0012] Preferably, the passenger seat is connected to the vehicle floor profile at the bottom of the seat legs via rubber vibration isolators. The rubber vibration isolators are designed with dynamic and static stiffness to meet the load requirement of 1mm static deformation of the seat under a full load of 130kg, and also meet the dynamic stiffness requirement for effective vibration isolation above 20Hz.

[0013] Preferably, the rubber vibration isolator forms the first layer of vibration isolation for the passenger seat, isolating the transmission of vehicle body vibration excitation to the passenger seat.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a floating raft-type vibration isolation and sound insulation structure and method for the floor system of high-speed trains. It proposes a novel floating raft-type double-layer vibration isolation structure for passenger seats and passenger compartment floors, which completely cuts off the acoustic bridge connection between the passenger compartment floor and the car body profile floor. At the same time, based on the basic principle of floating raft vibration isolation, the stiffness and damping parameters of the rubber vibration isolators are appropriately designed to form better vibration reduction and sound insulation performance in the entire frequency range, which greatly improves the acoustic and vibration comfort of the passengers. Attached Figure Description

[0015] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 It is the floating raft-type vibration isolation and sound insulation structure of the EMU floor system; Figure 2 yes Figure 1 A schematic diagram of the partial structure of I; Figure 3 yes Figure 1 A schematic diagram of a partial structure of section II; Figure 4 This is a schematic diagram showing the layout of the guest room floor panels and the arrangement of the suspension installation points; Figure 5 It is the mounting bracket for the rubber vibration isolator at the lower end of the seat; Figure 6 It is a mounting base for sidewall rubber vibration isolators; Figure 7 It is a rubber sealing sleeve; Figure 8 It is a rubber sealing ring; Figure 9 This is the vibration isolation performance curve of the floating raft floor system; Figure 10 This is the predicted sound insulation result for the floating raft floor system; In the diagram: 1. Side wall profile; 2. Interior panel; 3. Passenger seat; 4. Seat leg; 5. Vibration isolator mounting base; 6. First hanger; 7. Passenger compartment floor; 8. Sound-absorbing material; 9. Rubber vibration isolator; 10. Rubber sealing ring; 11. Rubber sealing sleeve; 12. Vehicle body floor profile; 13. Rubber sealing strip; 14. Second hanger; 15. Side wall vibration isolator mounting base; 16. Rubber vibration isolator; 17. Water deflector; 101. Seat mounting plate; 102. Bolt; 103. Rubber vibration isolator; 201. Water deflector connector; 202. Rubber sealing strip; 203. First bolt; 204. Second bolt; 301. Elastic connection at the side wall; 302. Elastic connection at the seat leg; 304. Elastic connection at the lower end of the seat; 305. Passenger compartment floor seam. Detailed Implementation

[0016] 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. The accompanying drawings are for illustrative purposes only and represent schematic diagrams, not actual pictures, and should not be construed as limiting this patent. In order to better illustrate the specific implementation of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size.

[0017] Please see Figure 1-10 A floating raft-type vibration isolation and sound insulation structure for a high-speed train floor system includes a passenger seat 3, a first suspension rod 6, and a water baffle 17. The passenger seat 3 is located at the lower end of the seat support leg 4 and is installed with the car body floor profile 12 through a rubber vibration isolator 9. The passenger seat 3 forms a first-level vibration isolation system. The passenger seat 3 is equipped with a seat mounting plate 101 at its lower end, and the vibration isolator mounting base 5 is mounted on the seat mounting plate 101 by bolts 102. The lower end of the first suspension rod 6 is connected to the passenger compartment floor 7, and the upper end is connected to the passenger seat 3 through the rubber vibration isolator 103 and the vibration isolator mounting base 5. The passenger compartment floor 7 is suspended under the passenger seat 3, and the passenger compartment floor 7 forms a second level of vibration isolation. The air cavity between the passenger compartment floor 7 and the vehicle body floor profile 12 is filled with porous or fibrous sound-absorbing material 8 to reduce airborne sound transmission. The seat leg 4 is fitted with a rubber sealing sleeve 11, and the lower end of the rubber sealing sleeve 11 is sealed and bonded to the passenger compartment floor 7 with sealant. The seat leg 4 is equipped with a highly elastic rubber sealing ring 10, and the inner and outer surfaces of the rubber sealing ring 10 are bonded to the seat leg 4 and the passenger compartment floor 7 by sealant. The upper end of the water baffle 17 is connected to the side wall profile 1 and interior panel 2 of the vehicle body by the second bolt 204, and the lower end is sealed and inserted into the rubber sealing strip 202. The rubber sealing strip 202 is sealed and bonded to the passenger compartment floor 7. The passenger compartment floor 7 is sealed and bonded to the side wall profile 1 of the vehicle body at the end near the side wall by a rubber sealing strip 13; The passenger room floor 7 is elastically mounted on the side wall profile 1 at the end near the side wall via a second hanger 14, a rubber vibration isolator 16, and a side wall vibration isolator mounting base 15, forming a vibration isolation installation. The passenger seat 3 forms a floating floor vibration isolation and sound insulation system through the elastic connector 302 at the seat support leg, the elastic connector 301 at the side wall, and the elastic connector 304 at the lower end of the passenger seat 3 and the lower end of the seat of the passenger compartment floor 7.

[0018] The interior of the guest room is formed by splicing together multiple guest room floor panels 7, and the seams of the guest room floor panels 305 are sealed.

[0019] The lower end of the rubber vibration isolator 16 is fitted with a first bolt 203.

[0020] The upper end of the rubber sealing strip 202 is equipped with a water baffle plate 201.

[0021] A floating raft-type vibration isolation and sound insulation method for a high-speed train floor system, the method comprising the following steps: Step 1: The seats and passenger compartment floor are connected by vibration isolation to form a floating raft-type vibration isolation system. Treating both as concentrated masses, their dynamic equations can be written as follows: (1) (2); Step 2: Assume the vibration acceleration form of the floor profile. (3) in The amplitude of the vibration displacement. Angular frequency, For time; The vibration displacement transmissibility of the passenger room floor is derived. (4) Step 3: If the guest room floor is installed directly and flexibly onto the floor profile using the traditional floor support method, then the guest room floor is a single-stage vibration isolation system, and its vibration transmission rate is: (5) Step 4: Calculate the sound insulation characteristics of the floor cross section using the finite element method.

[0022] In step one and These represent the quality of the passenger compartment floor and seats, respectively. , , These are the vibration displacements of the passenger floor, seats, and floor profiles, respectively. and These are the vibration isolation stiffness of the passenger compartment floor and seats, respectively.

[0023] Among them, the passenger seat 3 is connected to the vehicle floor profile 12 at the bottom of the seat support leg 4 via a rubber vibration isolator 9. The rubber vibration isolator 9 is designed with dynamic and static stiffness to meet the load requirement of 1mm static deformation of the seat under a full load of 130kg, and also meets the dynamic stiffness requirement of effective vibration isolation above 20Hz.

[0024] Among them, the rubber vibration isolator 9 forms the first layer of vibration isolation for the passenger seat, isolating the transmission of vehicle body vibration excitation to the passenger seat.

[0025] It should be noted that the seat 3 is installed at the lower end of the support leg 4, forming a vibration isolation system with the vehicle floor profile 12 via rubber vibration isolators 9. The seat forms the first-level vibration isolation system, which has a vibration isolation function and can improve riding comfort; A seat mounting plate 101 is installed at the lower end of the seat 3, and the vibration isolator mounting seat 5 is installed on the seat mounting plate 101 by bolts 102. The lower end of the suspension rod 6 is connected to the passenger compartment floor 7, and the upper end is connected to the seat 3 via a rubber vibration isolator 103 and a vibration isolator mounting base 5. The passenger compartment floor is suspended from the lower end of the seat. The passenger compartment floor forms a second level of vibration isolation. The vibration transmission rate of the passenger compartment floor 7 relative to the vehicle body is effectively reduced, improving vibration isolation and sound insulation performance; The air cavity between the passenger compartment floor 7 and the vehicle body floor profile 12 is filled with porous or fibrous sound-absorbing material 8 to reduce airborne sound transmission. A rubber sealing sleeve 11 is fitted on the outrigger 4. The lower end of the rubber sealing sleeve 11 is sealed and bonded to the passenger compartment floor 7 with sealant to ensure acoustic sealing. A large elastic rubber sealing ring 10 is installed on the support leg 4. The inner and outer surfaces of the rubber sealing ring 10 are bonded to the seat support leg 4 and the passenger compartment floor 7 with sealant to ensure acoustic sealing. The upper end of the water baffle 17 is connected to the side wall profile 1 and interior panel 2 of the vehicle body by bolts 204, and the lower end is sealed and inserted into the rubber sealing strip 202. The rubber sealing strip 202 is sealed and bonded to the passenger compartment floor 7 to ensure acoustic sealing. At the end of the passenger compartment floor 7 near the side wall, a rubber sealing strip 13 is used to seal and bond it to the side wall profile 1 of the vehicle body to ensure acoustic sealing. At the end of the passenger room floor 7 near the side wall, it is flexibly installed on the side wall profile 1 through the hanger 14, rubber vibration isolator 16, and side wall vibration isolator mounting base 15 to form a vibration isolation installation; Inside the guest room, multiple pieces of guest room floor are spliced ​​together to form the interior floor surface, and the seams are sealed at 305 points to ensure acoustic sealing. The passenger seat 3 is connected to the outriggers 302, the side wall 301, and the lower end of the seat to the passenger compartment floor 304, forming a floating floor vibration isolation and sound insulation system.

[0026] Theoretical explanation: The seats and passenger compartment floor are connected by vibration isolation to form a floating raft-type vibration isolation system. Treating both as concentrated masses, their dynamic equations can be written as follows: (1) (2) in, and These represent the quality of the passenger compartment floor and seats, respectively. , , These are the vibration displacements of the passenger floor, seats, and floor profiles, respectively. and These are the vibration isolation stiffness of the passenger compartment floor and seats, respectively.

[0027] Assuming the vibration acceleration form of the floor profile (3) in The amplitude of the vibration displacement. Angular frequency, For time.

[0028] The vibration displacement transmissibility of the passenger room floor is derived. (4) If the guest room floor is installed directly and flexibly onto the floor profile using the traditional floor support method, then the guest room floor is a single-stage vibration isolation system with a vibration transmission rate of [missing information]. (5) According to the vibration isolation and sound insulation design method of the floor system provided by this invention, at the same frequency, the vibration displacement transmission rate of the passenger room floor is lower, thus achieving a higher vibration reduction effect. Figure 9 As shown.

[0029] The sound insulation characteristics of the floor section were calculated using the finite element method. The calculation results are as follows: Figure 10 As shown, it can be concluded that, compared with traditional floor sound insulation design, the floating raft-type vibration isolation and sound insulation structure and method of the EMU floor system provided by the present invention can achieve better sound insulation effect of the floor section, especially in the low frequency broadband range within 600Hz, the sound insulation can be improved by up to 10dB.

[0030] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0031] 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 floating raft type vibration and sound insulation structure of a high speed train floor system, comprising a passenger seat (3), a first hanger rod (6), and a water baffle (17), characterized in that: The passenger seat (3) is arranged at the lower end of the seat leg (4), and is vibration-isolated mounted with the car body floor profile (12) through a rubber vibration isolator (9), and the passenger seat (3) forms a first-stage vibration isolation system; The passenger seat (3) is mounted with a seat mounting plate (101) at the lower end, and the vibration isolator mounting seat (5) is mounted on the seat mounting plate (101) through bolts (102); The first hanging rod (6) is connected with a passenger compartment floor (7) at the lower end, and is connected with the passenger seat (3) through a rubber vibration isolator (103) and the vibration isolator mounting seat (5) at the upper end, and the passenger compartment floor (7) is suspendedly mounted at the lower end of the passenger seat (3), and the passenger compartment floor (7) forms a second-stage vibration isolation system; An air cavity between the passenger compartment floor (7) and the car body floor profile (12) is filled with porous or fibrous sound-absorbing material (8), so as to reduce air sound transmission; The seat leg (4) is sleeved with a rubber sealing sleeve (11), and the lower end of the rubber sealing sleeve (11) is sealed and bonded with the passenger compartment floor (7) through sealing glue; The seat leg (4) is mounted with a large-elasticity rubber sealing ring (10), and the inner circle surface and the outer circle surface of the rubber sealing ring (10) are bonded with the seat leg (4) and the passenger compartment floor (7) through sealing glue; The upper end of the water baffle (17) is connected with the side wall profile (1) and the interior trim panel (2) of the car body through the second bolt (204), the lower end is sealingly inserted with the rubber sealing strip (202), and the rubber sealing strip (202) is sealingly bonded with the passenger compartment floor (7); The passenger compartment floor (7) is sealingly bonded with the side wall profile (1) of the car body at the end close to the side wall through the rubber sealing baffle (13); The passenger compartment floor (7) is elastically mounted on the side wall profile (1) at the end close to the side wall through the second hanging rod (14), the rubber vibration isolator (16) and the side wall vibration isolator mounting seat (15), and forms a vibration-isolated mounting; The passenger seat (3) constitutes a floating raft type floor vibration isolation and sound insulation system through the elastic connecting piece (302) at the seat leg, the elastic connecting piece (301) at the side wall, and the seat lower end elastic connecting piece (304) between the lower end of the passenger seat (3) and the passenger compartment floor (7).

2. The floating raft type vibration and sound isolation structure of a floor system of a motor train unit according to claim 1, characterized in that: The passenger compartment interior is spliced by a plurality of passenger compartment floors (7) to form an internal floor surface, and the passenger compartment floor splicing joint (305) is sealingly treated.

3. The floating raft type vibration and sound isolation structure of a floor system of a motor train unit according to claim 1, characterized in that: The lower end of the rubber vibration isolator (16) is mounted with the first bolt (203).

4. The floating raft type vibration and sound isolation structure of a floor system of a motor train unit according to claim 1, characterized in that: The upper end of the rubber sealing strip (202) is mounted with the water baffle insertion plate (201).

5. A floating raft type vibration and sound insulation method for a high speed train floor system, characterized in that: The method comprises the following steps: Step one, the seat and the passenger compartment floor form a floating raft type vibration isolation system through vibration isolation connection, and the two are equivalent to concentrated masses, and the dynamic equations thereof can be respectively written as: (1) (2)； Step two, assuming that the vibration acceleration form of the floor profile is (3) wherein is the amplitude of the oscillatory displacement, is the angular frequency, is time; The vibration displacement transmissibility of the passenger compartment floor is derived as (4) Step three, if the passenger compartment floor is directly elastically mounted on the floor profile in the traditional floor support mode, the passenger compartment floor is a single-stage vibration isolation system, and the vibration transmissibility thereof is: (5) Step four, the sound insulation characteristics of the floor section are calculated through the finite element method.

6. The floating raft type vibration and sound isolation method of a motor train unit floor system according to claim 5, characterized in that: In step one and represent the mass of the passenger floor and the seat, respectively, , , are the vibration displacements of the passenger floor, the seat, and the floor profile, respectively, and are the vibration isolation stiffness of the passenger floor and the seat, respectively.

7. The floating raft type vibration and sound isolation structure of a high speed train floor system according to claim 1, characterized in that: The passenger seat (3) is connected with the car body floor profile (12) at the bottom of the seat leg (4) through a rubber vibration isolator (9), the rubber vibration isolator (9) is designed in dynamic and static stiffness, and meets the load bearing requirement of 1mm static deformation of the seat under the full load 130kg condition, and meets the dynamic stiffness requirement of effective vibration isolation above 20Hz.

8. The floating raft type vibration and sound isolation structure of a floor system of a motor train unit according to claim 1, characterized in that: The rubber vibration isolator (9) forms the first layer vibration isolation of the passenger seat, and isolates the transmission of the car body vibration excitation to the passenger seat.

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