JP4334391B2 - Railway vehicle body structure with active noise control system - Google Patents

Description

  The present invention relates to a reduction in indoor noise of a high-speed railway vehicle.

  The demands on railway vehicles include travel speed, reduction of environmental burden, and comfort in the passenger compartment. In recent years, the speed of railway vehicles has been further increased, and market competition with aircraft has been intensifying. If the speed is increased, ground vibration and environmental noise increase, and operational energy increases. In recent years, vehicle bodies have been made lighter by using an aluminum structure. When it comes to market competition with aircraft as a high-speed moving means, the comfort in the passenger compartment is also regarded as important, and in particular, reduction of in-vehicle noise is strongly demanded. However, both the high speed and light weight described above can cause the increase in vehicle interior noise, and measures have been taken so far, such as improving the sound insulation of structures and interiors, and reducing vibration transmission. Has been made.

By the way, the sound insulation of the wall surface is generally proportional to the surface density of the wall surface, as known as the mass law. There is also a method of improving sound insulation by packing a sound absorbing material between double walls, but the thickness of the stance must be increased. Both are contradictory to weight reduction and securing guest room space, and should be avoided as much as possible.
That is, there is a demand for a thin, lightweight member with good sound insulation.
The following patent document discloses so-called active noise control and a railway vehicle using the so-called active noise control.
Japanese Patent Laid-Open No. 6-308979 JP 2002-318484 A Proceedings of the 10th Railway Technology General Symposium of the Japan Society of Mechanical Engineers, December 9, 2003, p. 365-368

  The problem to be solved by the present invention is to provide a railway vehicle body structure that is thin, lightweight, and has good sound insulation using active noise control.

A conventional railway vehicle body 20 will be described with reference to FIG.
The railcar structure 10 is composed of a structure composed of a frame 11, a side structure 12, a roof structure 13, and the like, and a covering material such as an interior material 22, a window 23, and a duct 25. For the structure 10, a hollow extruded mold material called a double skin or an extruded mold material with a rib called a single skin is used. The rail car body 20 includes a vehicle interior floor 21, a ceiling interior material 22 b, a side interior material 22 a, a window 23, a cargo rack 24, an air conditioning duct 25, and the like in the structure 10 to form a vehicle interior 27. Note that the left side of FIG. 3 shows a windowless portion without the window 23, and the right side shows a windowed portion with the window 23.

  In general, the rail vehicle body 20 includes a heat insulating sound absorbing material 26 using glass wool, acrylic oxide fiber, carbon fiber, melamine resin, or the like between the underframe 11 and the vehicle interior floor 21, the side structure 12 or the roof structure 13, and the interior material 22. It is housed to improve heat insulation in the passenger compartment and sound insulation of the vehicle structure.

  Incidentally, as described in the background art, generally, the sound insulation of the wall surface is proportional to the surface density of the wall surface. Further, in the double wall having a sound absorbing structure inside as shown in FIG. 3, the sound insulation can be somewhat improved by the thickness of the sound absorbing structure. That is, if the weight is increased or the thickness of the vehicle structure is increased, the sound insulation can be improved, but this is not preferable from the viewpoint of reducing the weight and securing the indoor space. Furthermore, these effects also have a drawback that they are difficult to obtain in a low frequency range where the wavelength is about the size of the cross section of the vehicle body.

  On the other hand, as one means for solving these problems, vehicles using active noise control as shown in Patent Document 1 and Non-Patent Document 1 have been developed. This is to cancel the noise, which is the vibration wave of the air, by generating noise having the opposite phase to that, and to improve the sound insulation without significantly increasing the weight and the thickness of the stance.

  The present invention relates to an improvement in the mounting structure when the active noise control module 30 is mounted on the railway vehicle body 20.

  The above-described problem is that in the railway vehicle body 20 in which the interior material 22 and the window 23 are mounted on each part of the structure structure 10 including the underframe 11, the side structure 12, the roof structure 13, and the wife structure, the frame 31, the speaker 32, an active noise control module 30 including a microphone 33 and a control circuit 34 is disposed between the structure 10 of the railway vehicle body 20 and the interior material 22, and the frame 31 of the active noise control module 30 is This is achieved by integrally forming with the interior material 22.

  According to the present invention, it is possible to improve the sound insulation without significantly increasing the thickness and weight of the vehicle body 20 in the railway vehicle body, and it is possible to realize a quiet vehicle interior environment even when traveling at high speed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. FIG. 2 shows an assembly diagram of FIG.
As shown in the figure, in a cross section of a general portion of a railway vehicle, a heat insulating sound absorbing material 26 is attached between the structure 10 and the interior material 22. The heat insulating sound-absorbing material 26 is made of glass wool, acrylic oxide fiber, carbon fiber, melamine resin or the like, and is intended to insulate and sound-insulate the vehicle interior from the outside of the vehicle, and is sometimes referred to as a heat insulating material or a sound absorbing material. is there. (Hereafter, it may be simply referred to as “heat insulation sound absorbing material”.)

  In this embodiment, an active noise control module 30 including a frame 31, a speaker 32, a microphone 33, and a control circuit 34 is inserted between the interior material 22 and the heat insulating sound absorbing material 26, and the active noise control frame 31a is used as the interior material. 22 is integrally formed. The control circuit 34 performs control so that the noise level acquired by the microphone 33 is minimized, and the speaker 32 is driven. Thereby, the noise which permeate | transmits the structure 10 and the heat insulation sound-absorbing material 26 from the vehicle exterior, and permeate | transmits into the vehicle interior 27 is reduced. In FIG. 1, the active noise control frame 31a and the speaker unit 32 are separated from each other, but the speaker unit 32 is fixed to the active noise control frame 31a with screws or an adhesive. The control circuit 34 may be attached to the outside of the module or may be built in the frame 31.

  The interior material 22 may be made of, for example, a sheet of interior decorative wallpaper pasted on an aluminum plate or a decorative paint. The active noise control frame 31a may be made of, for example, a bent aluminum plate or an extruded aluminum plate. The interior material 22 and the active noise control frame 31a can be formed as an interior material integrally formed by, for example, welding, bonding, or rivet combination.

  Further, the interior material 22 may be made of, for example, a glass fiber reinforced plastic molded and painted on the surface. The active noise control frame 31a may be made of a glass fiber reinforced plastic or a molded material such as ABS resin or nylon resin. The interior material 22 and the active noise control frame 31a may be configured by integrally forming the frame as a framework of the interior material 22 with glass fiber reinforced plastic. The active noise control frame 31a may be integrally formed by being fixed to the interior material 22 by adhesion, resin welding, or rivets.

  FIG. 3 shows a sectional view of a general railway vehicle. The railway vehicle body 20 includes a frame 11, a side structure 12, a roof structure 13, and the like. An interior floor 21, a ceiling interior material 22 b, a side interior material 22 a, a window 23, a cargo rack 24, an air conditioning duct 25, and the like are incorporated into the inside of the railway vehicle to form a vehicle interior 27. Note that the left side of FIG. 3 shows a windowless portion without the window 23, and the right side shows a windowed portion with the window 23.

  In general, in a railway vehicle, a heat insulating sound absorbing material 26 using glass wool, acrylic oxide fiber, carbon fiber, melamine resin or the like is accommodated between the underframe 11 and the vehicle interior floor 21, the side structure 12, the roof structure 13, and the interior material 22. Thus, the heat insulation of the vehicle interior 27 and the sound insulation of the vehicle structure are improved. However, in order to obtain the necessary sound insulation, the weight and the thickness of the arm must be increased, which is not preferable from the viewpoint of reducing the weight of the vehicle body and securing the indoor space, and greatly increases the weight and the arm thickness. There has been a demand for a technique for improving sound insulation without any problems. The present invention achieves improved sound insulation and reduced indoor noise by applying the structure shown in the above-described embodiment to the floor, side, and roof of a railway vehicle.

  FIG. 4 is a cross section of the railcar shown in FIG. Currently, the most common side interior material 22a of a vehicle is formed by sticking a sheet-like interior decorative wallpaper to a metal plate such as aluminum and simultaneously pressing them, and this side interior material 22a is formed on the side structure 12. Installed and configured side.

  On the other hand, FIG. 5 shows an example in which the present invention is applied to the side structure of FIG. In this embodiment, the active noise control frame 31 that also serves as reinforcement of the side interior material 22a is welded, for example, to the back side of the interior material 22a press-formed as described above, that is, between the side structure 12 and the side interior material 22a. Alternatively, the active noise control module 30 is formed on the back side of the side interior material 22a by being attached to the side interior material 22a by adhesion or rivet. Thereby, the active noise control module 30 can be formed without significantly increasing the weight and the number of steps.

  In addition, the current general side interior materials vary in the curvature of each part depending on the location due to the design, but changing the characteristics of the active noise control module attached to the back by making the curvature the same over a wide range. It is possible to reduce costs.

6 to 8 show another embodiment of the present invention.
When it is impossible to attach the active noise control module 30 to the interior material 22 because the structure of the interior material 22 is complicated or there are many irregularities, the active noise control module 30 is attached to the structure 10 side. . A single skin shown in FIG. 6 may be used for the structure 10. In such a case, a method may be considered in which the rib 14a of the single skin structure is used as a mounting member for the active noise control module 30, and the active noise control module 30 is inserted and slid in the longitudinal direction. The frame 31 of the active noise control module 30 is provided with a groove 35 for insertion into the rib 14a of the structure. The thickness of the rib 14a of the structure is 2 millimeters, for example, and the width of the groove 35 is 3 millimeters, for example. Accordingly, since the groove 35 has only a gap necessary for sliding with respect to the rib 14a, it is possible to suppress the mounting play of the active noise control module 30.

  The active noise control module 30 is attached by sliding the rib 14a, but may be fixed by a bolt 41 so as not to slide after the attachment. FIG. 6 shows a structure in which the frame 31 and the rib 14a of the active noise control module 30 are penetrated and fixed by the bolt 41, but the bolt 41 is fixed to the rib 14a on the side surface of the frame 31 so as not to slide. Also good.

  The bolt 41 may be a screw or a rivet in consideration of the mounting workability and size of the active noise control module 30.

  If the active noise control module can be made sufficiently small, the entire active noise control module may be inserted into the rib portion 14a of the single skin structure as shown in FIG.

  The height T1 of the rib 14a is, for example, 11 millimeters, and the height T2 of the active noise control module 30 is, for example, 10 millimeters. As a result, the active noise control module 30 can be mounted simply by sliding it into the rib 14a. The active noise control module 30 is mounted by sliding in the rib 14a, but may be fixed by a bolt 41 so as not to slide after the mounting. FIG. 7 shows a structure in which the frame 31 and the rib 14a of the active noise control module 30 are penetrated and fixed by the bolt 41. However, even if the bolt 41 is fixed to the rib 14a on the side surface of the frame 31 so as not to slide. Good.

  Further, even if the structure 10 has a double skin structure as shown in FIG. 8, a method of providing a curtain rail 14b or the like as shown in FIG. The frame 31 is provided with a projection 31b for sliding the curtain rail 14b. The protrusion 31b has a T-shape so that the protrusion 31b slides securely in the curtain rail 14b and does not rattle. The active noise control module 30 is attached by sliding in the curtain rail 14b, but may be fixed by a bolt 41 so as not to slide after the attachment. FIG. 8 shows a structure in which the frame 31 and the curtain rail 14b of the active noise control module 30 are penetrated and fixed by the bolt 41, but the bolt 41 is fixed to the side of the frame 31 to the curtain rail 14b so as not to slide. May be.

9 to 14 show another embodiment of the present invention.
A heat insulating sound absorbing material 26 is generally used between the structure 10 and the interior material 22. The heat insulating sound absorbing material 26 is made of a fibrous material such as glass wool, acrylic oxide fiber, or carbon fiber. In recent years, a foam material having a high surface hardness such as urethane or melamine resin is also used. Since the foam material having such a high surface hardness is excellent in workability and workability, the inside of the heat insulating sound absorbing material 26 formed of the foam material as shown in FIGS. It is also conceivable to install an active noise control module 30 in the space. Thereby, the active noise control module 30 can be attached relatively stably without increasing the attachment process, weight, and cost with respect to the installation of the active noise control module 30. The active noise control module 30 is fixed to the inside of the heat insulating sound absorbing material 26 by adhesion. In bonding, the structure 31 can be simplified and the weight and cost can be reduced by fixing the frame 31 to the heat insulating sound absorbing material 26 with an adhesive, a double-sided tape, or a fastener such as Velcro.

  FIG. 10 shows an example of a method of hollowing out the inside of the heat insulating sound absorbing material 26 formed of a foam material and installing the active noise control module 30 in the space. The heat insulating sound absorbing material is provided on both surfaces of the active noise control module 30. It is sectional drawing in the case of arranging 26. By disposing the heat insulating sound absorbing material 26 on both surfaces of the active noise control module 30, the heat insulating sound absorbing material 26 can be attached to both the structure 10 and the interior material 22 by bonding or the like. Workability can be improved.

  As shown in FIGS. 12 to 14, when the space in the active noise control module 30 is relatively large and the acoustic characteristics of the heat insulating sound absorbing material 26 are well known, the active noise control module 30 includes the By enclosing the heat insulating sound absorbing material 26, the vibration of the interior material 22 can be further reduced, and the indoor noise can be reduced without significantly impairing the heat insulating performance of the active noise control module section. However, at this time, the heat insulating sound absorbing material 26 installed in the active noise control module 30 can be prevented from coming into contact with the speaker 32 by being fixed to the active noise control frame 31 by adhesion or the like. It becomes possible to prevent the influence on radiation.

FIG. 15 shows another embodiment of the present invention.
Depending on the size of the active noise control module, the effect may not be obtained at the necessary frequency with the necessary noise reduction. This is because control is difficult when the wavelength is long or short with respect to the size of the module. Therefore, in order to improve this, as shown in the figure, a module whose size is changed in several stages may be formed in a multistage structure in the thickness direction. The heat insulating sound absorbing material 26 is made of a foam material having a high surface hardness. After the first stage active noise control module 30a is attached, the heat insulating sound absorbing material 26a is attached, and the second and subsequent active noise control modules 30b are mounted thereon. Can be attached. In this way, by changing and combining the sizes and applicable frequency bands of the active noise control modules 30a and 30b, it is possible to exert a reduction effect on noises having a plurality of frequencies that are transmitted from the outside of the vehicle to the vehicle interior 27.

Basic structure when the frame of the active noise control module is integrally formed with the interior. The assembly drawing of FIG. Sectional drawing of a general rail vehicle. FIG. 4 is a cross-sectional view of the railcar side shown in FIG. The figure which shows the example which implemented this invention to the side of FIG. 4, the window lower part structure. The figure which shows the active noise control module attachment example to a single skin structure. The figure which shows the active noise control module attachment example to a single skin structure. The figure which shows the example of active noise control module attachment to a double skin structure. The figure which shows the example which installed the module in the space which hollowed out the heat insulation sound-absorbing material. The figure which shows the example which installed the module in the space which hollowed out the heat insulation sound-absorbing material. The figure which shows the example which installed the module in the space which hollowed out the heat insulation sound-absorbing material. The figure which shows the example which installed the heat insulation sound-absorbing material arrange | positioned in the module. The figure which shows the example which installed the heat insulation sound-absorbing material arrange | positioned in the module. The figure which shows the example which installed the heat insulation sound-absorbing material arrange | positioned in the module. The figure which shows the example which cut out the heat insulation sound-absorbing material and installed the module in multiple stages.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Rail vehicle structure 11 ... Underframe 12 ... Side structure 13 ... Roof structure 14a ... Structure rib 14b ... Structure curtain rail 20 ... Rail vehicle body 21 ... Car interior floor 22 ... Interior material 22a ... Side interior material 22b ... Roof interior material 23 ... Windows 24 ... Shelf 25 ... Air-conditioning duct 25a ... Air-conditioning duct floor lower part 25b ... Air-conditioning duct rising part 25c ... Air-conditioning duct blow-out part 26 ... Heat insulation sound absorbing material 27 ... Car interior 30, 30a, 30b ... Active noise control module 31 ... Active Noise control frame 31a ... Interior integrated type active noise control frame 31b ... Projection 32 ... Active noise control speaker unit 33 ... Active noise control microphone 34 ... Active noise control control device 35 ... Groove 41 ... Bolt

Claims (5)

  Active noise consisting of frames, speakers, microphones, and control circuits in railway vehicle bodies equipped with interior materials and windows on each part of the structure structure consisting of underframe, side structure, roof structure, and wife structure A railway vehicle characterized by applying a structure in which a control module is disposed between a structure of the railway vehicle body and an interior material, and a frame of the active noise control module is integrally formed with the interior material of the railway vehicle body. Body structure.   An active noise control module frame disposed between the structure structure and the interior material according to claim 1 and integrally formed with the interior material, wherein the active noise control frame and the attachment fixing means for the interior material include an interior material, and A railway vehicle body structure characterized in that both interior reinforcement members also serving as active noise control frames are press-formed, and the active noise control frame / interior reinforcement members and the interior materials are fixed by welding or bonding. Active noise consisting of frames, speakers, microphones, and control circuits in railway vehicle bodies equipped with interior materials and windows on each part of the structure structure consisting of underframe, side structure, roof structure, and wife structure A railway vehicle body structure characterized by applying a structure in which a control module is installed in a space formed by hollowing out the interior of a structure or interior material of the railway vehicle body or a sound absorbing material . The railway vehicle body structure according to claim 3, wherein a structure in which a heat insulating material or a sound absorbing material is filled in the active noise control module is applied. The railway vehicle body structure according to any one of claims 1 to 4 , wherein a structure in which the active noise control modules having different sizes are configured in multiple stages in a thickness direction is applied.

Images