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Sound dampening member for electric-powered vehicles

A technology for electric vehicles and components, applied in electric vehicles, vehicle components, electric power devices, etc., can solve problems such as sound residue, and achieve the effect of preventing the generation of wind noise

Pending Publication Date: 2021-08-24
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, conventional sound absorption using porous materials such as felt and Thinsulate has the problem that the peak sound of a specific frequency remains

Method used

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  • Sound dampening member for electric-powered vehicles
  • Sound dampening member for electric-powered vehicles
  • Sound dampening member for electric-powered vehicles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0321]

[0322] An acrylic plate (manufactured by Hikari Co., Ltd.) with a thickness of 3 mm was prepared, and a frame body having 6×11 openings of 20 mm×20 mm was produced. Processing is performed using a laser cutter. The overall size is set to 300mm×180mm.

[0323] As the back panel, an acrylic plate with a thickness of 2mm was processed to a size of 300mm×180mm, and it was attached to one surface of the frame. Mounting was performed using double-sided tape (Genbano Chikara manufactured by ASKUL Corporation).

[0324] As a film member, a PET film (Lumirror manufactured by TORAY INDUSTRIES, INC.) having a thickness of 50 μm was cut into a size of 300 mm×180 mm. Use double-sided tape to attach the film-like component to the other side of the frame.

[0325] In this way, a film-like member with a thickness of 50 μm constitutes a film vibrating portion with a size of 20 mm×20 mm, and 6×11 film-type resonant structures with a rear surface distance of 3 mm are arranged.

[...

Embodiment 2

[0350] The thickness of the back space (that is, the thickness of the acrylic plate) is set to 5 mm, the size of the opening of the frame is set to 30 mm × 30 mm, the thickness of the film-like member (PET film) is set to 100 μm, and 4 In the same manner as in Example 1, except for the structure of ×8, a membrane-type resonant structure was produced, and the amount of attenuation was measured in the same manner as in Example 1.

[0351] The film-type resonant structure of Example 2 has a sound absorption peak around 2 kHz.

[0352] show the result in Figure 29 .

[0353] Depend on Figure 29 It can be seen that, compared with Comparative Example 1, the amount of silencing in Example 2 is larger, and a maximum amount of silencing of 10.5 dB can be obtained.

Embodiment 3

[0355] A film-type resonant structure was produced in the same manner as in Example 1 except that the thickness of the back space (that is, the thickness of the acrylic plate) was 2 mm, and 6×11 pieces were arranged. The amount of attenuation was measured in the same manner as in Example 1.

[0356] The film-type resonant structure of Example 3 has a sound absorption peak around 4.5 kHz.

[0357] show the result in Figure 30 .

[0358] Depend on Figure 30 It can be seen that the amount of attenuation in Example 3 is larger than in Comparative Example 1.

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PUM

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Abstract

Provided is a sound dampening member for electric-powered vehicles which is able to suitably reduce narrow-band sound generated by a motor or the like, is able to handle a plurality of frequencies, is able to prevent wind noise, and can be made compact and thin. This sound dampening member for electric-powered vehicles has a membrane resonance structure that dampens sound generated from a sound source disposed in an electric-powered vehicle. The sound source generates narrow-band sound. The membrane resonance structure is disposed in the same space as the sound source or in the passenger compartment of the electric-powered vehicle. The membrane resonance structure has at least one membrane member, a frame body that supports the membrane member so that the membrane member can vibrate, and a back plate that is placed on the frame body so as to face the membrane member. The membrane member, the frame body, and the back plate form a back space that is surrounded by the membrane member, the frame body, and the back plate, and the sound generated from the sound source is dampened by the membrane vibration of the membrane member of the membrane resonance structure.

Description

technical field [0001] The invention relates to a sound-absorbing component for an electric vehicle. Background technique [0002] In automobiles, electric vehicles such as hybrid vehicles, electric vehicles, and fuel cell vehicles that use motors in addition to engines as power sources or instead of motors as power sources are advancing. [0003] In a car using an engine (gasoline engine, diesel engine), low-frequency sound around 200 Hz generated by engine sound dominates as noise. On the other hand, in an electric vehicle, the low-frequency engine sound cannot be masked, so the sound on the high-frequency side is easy to hear. [0004] Furthermore, since the electric vehicle is driven by electricity, it is equipped with a motor, an inverter, and a frequency converter. They are known to emit narrow and intense sounds in the high frequency region of a few kHz depending on their rotational speed and / or carrier frequency. Also, sounds from electrical systems such as gear s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R13/08B62D25/10G10K11/16G10K11/172B60K1/00
CPCG10K11/172B60R13/0838Y02T10/70Y02T10/72B62D25/12B62D25/10
Inventor 白田真也细川隆史山添昇吾
Owner FUJIFILM CORP
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