Under-vehicle sound absorption and noise reduction structure of railway vehicle

Abstract

The utility model relates to an under-vehicle sound absorption and noise reduction structure of a railway vehicle, and belongs to sound absorption and noise reduction structures for railway vehicles. The metal fiber acoustic board is adhered to the periphery of the metal frame and is fixedly connected with the metal frame through rivets I, the metal fiber acoustic board and the metal frame are fixedly connected with the supporting and fixing plate through rivets II, the porous acoustic material is positioned above the high-temperature-resistant aerogel, and the porous acoustic material and the high-temperature-resistant aerogel are adhered to the upper part of the metal fiber acoustic board after being subjected to six-surface wrapping by aluminum foil. The sound absorption plate has the advantages that the structure is novel, the sound absorption effect is good through experimental tests, and the noise reduction coefficient of the whole structure can reach 0.5 or above through tests; the sound absorption structure is additionally arranged below the aluminum profile of the vehicle body chassis, so that the reverberation noise of wheel rails in a bogie area can be reduced; the sound absorption structure is high in material integration, high in installation reliability, resistant to high temperature and high in weather resistance.

Description

Technical Field

[0001] The utility model belongs to a sound absorbing and noise reducing structure for a rail vehicle, in particular to a sound absorbing and noise reducing structure under a rail vehicle. Background Art

[0002] With the ever-increasing speeds of high-speed trains, addressing the issue of train noise is becoming increasingly urgent. Noise not only impacts passenger comfort, but high levels of noise can also cause irritation and fatigue, and prolonged exposure to noise can even damage hearing. Furthermore, prolonged noise exposure poses a significant health threat to train drivers and crew, rapidly fatigued, and even disrupting normal operation. Therefore, controlling noise levels inside high-speed trains has become an urgent issue.

[0003] Currently, high-speed train equipment and bogies are a major source of noise. However, the available space above the train underframe and below the floor has reached its limit. To further improve the sound insulation and noise reduction capabilities of the underframe area, it is necessary to utilize the space below the underframe to improve the noise reduction capabilities of the underframe area. Summary of the Invention

[0004] The utility model provides a sound absorbing and reducing structure under a rail vehicle, so as to solve the problem that the space under the underframe of the rail vehicle is a semi-enclosed space and the noise is difficult to eliminate.

[0005] The technical solution adopted by the utility model is to include a porous sound-absorbing material, a high-temperature resistant aerogel, a metal fiber sound-absorbing panel, a metal frame, a supporting and fixing plate, aluminum foil, a first rivet, and a second rivet. The metal fiber sound-absorbing panel is bonded to the metal frame on all sides and fixedly connected together by the first rivet. The metal fiber sound-absorbing panel and the metal frame are fixedly connected to the supporting and fixing plate by the second rivet. The porous sound-absorbing material is located above the high-temperature resistant aerogel. The two are wrapped together with aluminum foil on six sides and then bonded to the top of the metal fiber sound-absorbing panel.

[0006] The porous sound-absorbing material includes materials such as rubber, plastic, foam and fiber.

[0007] The high temperature resistant aerogel includes fiber and inorganic materials.

[0008] The metal frame has vertical hems.

[0009] The middle of the support fixing plate is provided with an upward bulge, and both sides are provided with fixing holes connected with the vehicle body underframe sliding groove bolts.

[0010] The rivet 1 is a blind rivet.

[0011] The second rivet is a blind rivet.

[0012] The advantages of this utility model are its novel structure. Experimental tests have shown that it has excellent sound absorption effects. The overall structure has been tested to have a noise reduction coefficient of more than 0.5. The solution of adding a sound-absorbing structure under the aluminum profile of the vehicle body chassis can reduce the wheel-rail reverberation noise in the bogie area. The sound-absorbing structure has a high degree of integration of materials and strong installation reliability. The sound-absorbing structure integrates the noise reduction materials to a high degree, and the overall thickness can be adjusted according to the size of the space. The space between the chutes under the vehicle body chassis profile can be utilized. The metal fiber sound-absorbing panel is made of metal and has an advantage in strength over conventional porous sound-absorbing materials. At the same time, it is matched with a metal frame and a support fixing plate. The overall structural strength meets the requirements of high-speed vehicles. The fixing holes of the support fixing plate are fastened to the corresponding vehicle body chassis chutes in the form of bolts, and the middle of the support fixing plate is upward. After the whole is installed on the vehicle, the porous sound-absorbing material can be partially compressed, so that the sound-absorbing structure fits better with the lower surface of the vehicle body chassis and has strong installation reliability. The sound-absorbing structure is resistant to high temperatures and weathering. Considering the transient high temperatures generated by the undercar bogie during braking, the metal fiber sound-absorbing panels are made of metal to withstand these temperatures, while the thermal insulation effectively isolates the heat and protects the porous sound-absorbing material from the impact of high temperatures. Furthermore, the porous sound-absorbing material and thermal insulation are wrapped in aluminum foil on all six sides to effectively prevent dust from contaminating the porous sound-absorbing material during routine cleaning and operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 It is an exploded view of the utility model;

[0015] Figure 3 It is the main view of the utility model;

[0016] Figure 4 yes Figure 3 AA section view;

[0017] Figure 5 This is a reference diagram of the use state of the utility model;

[0018] Figure 6 This is a noise reduction effect diagram of the utility model;

[0019] Figure 7 It is a noise reduction comparison diagram of adopting the utility model and not adopting the utility model. DETAILED DESCRIPTION

[0020] like Figure 1 、 2As shown in Figures 3 and 4, it includes a porous sound-absorbing material 1, a high-temperature resistant aerogel 2, a metal fiber sound-absorbing panel 3, a metal frame 4, a supporting and fixing plate 5, an aluminum foil 6, a rivet 7 and a rivet 8, wherein the metal fiber sound-absorbing panel 3 is bonded to the metal frame 4 on all sides and fixed together by the rivet 7, the metal fiber sound-absorbing panel 3 and the metal frame 4 are fixedly connected to the supporting and fixing plate 5 by the rivet 8, the porous sound-absorbing material 1 is located above the high-temperature resistant aerogel 2, and the two are wrapped on six sides with aluminum foil 6 and then bonded to the top of the metal fiber sound-absorbing panel 3.

[0021] The porous sound-absorbing material 1 is made of materials including rubber, plastic, foam and fiber.

[0022] The high temperature resistant aerogel 2 includes fiber and inorganic materials.

[0023] like Figure 4 As shown, the metal frame 4 has a vertical folded edge 401 .

[0024] like Figure 4 As shown, the support fixing plate 5 has an upward protrusion 501 in the middle and fixing holes 502 on both sides that are connected to the vehicle body chassis sliding groove bolts.

[0025] like Figure 5 As shown, the fixing holes 502 of the support fixing plate 5 are fastened to the corresponding slide grooves of the vehicle body chassis 9 by bolts, and the middle of the support fixing plate is in an upward shape. After the whole is installed on the vehicle, the porous sound-absorbing material can be partially compressed, so that the sound-absorbing structure fits better with the lower surface of the vehicle body chassis, and the installation reliability is strong.

[0026] The rivet 7 is a blind rivet.

[0027] The rivet 2 8 is a blind rivet.

[0028] After experimental testing, the sound absorption effect is excellent, such as Figure 6 As shown in the figure, the overall structure has been tested to have a noise reduction coefficient of more than 0.5; the solution of adding a sound-absorbing structure under the aluminum profile of the car body chassis can reduce the wheel-rail reverberation noise in the bogie area by 2.2dBA, as shown in the figure. Figure 7 shown.

Claims

1. A sound-absorbing and noise-reducing structure under a railway vehicle, characterized by: It includes a porous sound-absorbing material, a high-temperature resistant aerogel, a metal fiber sound-absorbing panel, a metal frame, a supporting and fixing plate, aluminum foil, a first rivet, and a second rivet. The metal fiber sound-absorbing panel is bonded to the metal frame on all sides and fixed together by a first rivet. The metal fiber sound-absorbing panel and the metal frame are fixedly connected to the supporting and fixing plate by a second rivet. The porous sound-absorbing material is located above the high-temperature resistant aerogel. The two are wrapped together with aluminum foil on six sides and then bonded to the top of the metal fiber sound-absorbing panel.

2. The undercar sound absorption and noise reduction structure of a rail vehicle according to claim 1, characterized in that: The porous sound-absorbing material includes materials such as rubber, plastic, foam and fiber.

3. The undercar sound absorption and noise reduction structure of a rail vehicle according to claim 1, characterized in that: The high temperature resistant aerogel includes fiber and inorganic materials.

4. The undercar sound absorption and noise reduction structure of a rail vehicle according to claim 1, characterized in that: The metal frame has vertical hems.

5. The undercar sound absorption and noise reduction structure of a railway vehicle according to claim 1, characterized in that: The middle of the support fixing plate is provided with an upward bulge, and both sides are provided with fixing holes connected with the vehicle body underframe sliding groove bolts.

6. The undercar sound absorption and noise reduction structure of a rail vehicle according to claim 1, characterized in that: The rivet 1 is a blind rivet.

7. The undercar sound absorption and noise reduction structure of a rail vehicle according to claim 1, characterized in that: The second rivet is a blind rivet.

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