摘要:
There is provided a soundproof structure capable of obtaining a sufficient soundproofing effect by suppressing the leaking of sound due to a diffraction phenomenon in a partition member used for soundproofing. A soundproof unit, which has a frame body having an opening portion and a film that is disposed so as to cover the opening portion and vibrates according to a sound incident on the film, and a partition member, to which one or more soundproof units are attached, are provided.
摘要:
There is provided a soundproof structure that is small and has high soundproofing performance with respect to sound in a low frequency band. At least one soundproof cell including a frame having a hole portion and a film fixed to the frame is provided. The film has a surface density distribution. Assuming that a shortest line segment length between high surface density regions and between the high surface density regions and end portions of the hole portions is Δd, a longest line segment length between the end portions of the hole portions is L [m], a Young's modulus of a material of the low surface density region is E [Gpa], an average film thickness of the low surface density region is h [m], and a maximum surface density and a minimum surface density of the film are ρmax and ρmin, a parameter X in the following Equation (1) satisfies the following Inequality (2). X=Eh2/(ρmax/ρmin)[N] (1) (Δd/L−0.025)/(0.06)[N]≤X[N]≤10 [N] (2)
摘要:
There is provided a soundproof structure that is small and has high soundproofing performance with respect to sound in a low frequency band.At least one soundproof cell including a frame having a hole portion and a film fixed to the frame is provided. The film has a surface density distribution. Assuming that a shortest line segment length between high surface density regions and between the high surface density regions and end portions of the hole portions is Δd, a longest line segment length between the end portions of the hole portions is L [m], a Young's modulus of a material of the low surface density region is E [Gpa], an average film thickness of the low surface density region is h [m], and a maximum surface density and a minimum surface density of the film are ρmax and ρmin, a parameter X in the following Equation (1) satisfies the following Inequality (2). X=Eh2/(ρmax/ρmin) [N] (1) (Δd/L−0.025)/(0.06) [N]≤X [N]≤10 [N] (2)
摘要:
There is provided a soundproof structure that can selectively block sound having a specific frequency emitted from equipment, automobiles, and general households and can change the cutoff frequency of the sound in accordance with a change in the frequency of sound to be blocked. The above problem is solved by providing a laminated film, in which two or more films each including one or more holes drilled therein are laminated, and two rigid frames, which fix the laminated film so as to be interposed from both sides of the laminated film, and making at least parts of the one or more holes in the respective films of the laminated film overlap each other.
摘要:
Provided is a silencing tubular structure body that has high strength and can be disposed in a narrow space. A tubular member including a tubular portion having a tubular shape, and a frame portion having at least a part formed integrally with an inner peripheral surface side of the tubular portion; and a lid member that is exchangeably disposed on an opening surface of the frame portion of the tubular member are included, in which the frame portion and the lid member form a resonant silencing structure.
摘要:
An object is to provide a silencing system that can achieve both high ventilation performance and high soundproof performance, can silence a plurality of pieces of resonant sound, and has high general-purpose properties since the silencing system does not need to be designed according to a tubular member. In a silencing system where silencers are disposed on a tubular member, the silencers silence sound having a frequency of first resonance of the tubular member, each silencer includes a cavity portion and an opening portion, the opening portions are connected to a sound field space of the first resonance of the tubular member, a conversion mechanism for converting sound energy into thermal energy is disposed in each cavity portion or at a position where the conversion mechanism covers the opening portion, a ratio S1/Sd of the area S1 to the area Sd satisfies “0
摘要:
Two or more soundproof cells arranged in a two-dimensional manner are provided. At least one of the soundproof cells is a first soundproof cell configured to include a first frame having a first through-hole. At least one of the other soundproof cells is a second soundproof cell including a second frame having a second through-hole and a film fixed to the second frame. A first shielding peak frequency, which is determined by the first through-hole of the first soundproof cell and at which a transmission loss is maximized, is present on a lower frequency side than a first natural vibration frequency of the film of the second soundproof cell, and sound in a predetermined frequency band centered on the first shielding peak frequency is selectively insulated.
摘要:
A surface enhanced Raman spectrometry apparatus is constituted by: a transparent substrate; a metal member that causes surface enhanced Raman scattering to occur, formed on a surface of the transparent substrate; a pressing mechanism that presses a sample placed in contact with the metal member against the metal member; a measuring light irradiating optical system that irradiates a measuring light beam onto the sample through the transparent substrate; and a light detecting section that spectrally detects Raman scattered light, which is generated when the measuring light beam is irradiated onto the sample, through the transparent substrate.
摘要:
An optical electrical field enhancing device includes: a transparent substrate having a structure of fine protrusions and recesses on the surface thereof; and a metal structure layer of fine protrusions and recesses formed on the surface of the structure of fine protrusions and recesses. The metal structure layer of fine protrusions and recesses has a structure of fine protrusions and recesses, in which the distances among adjacent protrusions are less than the distances among corresponding adjacent protrusions of the structure of fine protrusions and recesses of the transparent substrate.
摘要:
Provided is a soundproof structure that is small and light and can sufficiently reduce noise with a high natural frequency of a sound source. There is provided a soundproof structure including a frame having an opening, and at least one membrane-like member fixed to an opening surface where the opening of the frame is formed, in which a rear surface space is formed to be surrounded by the frame and the membrane-like member, and a sound is absorbed due to vibration of the membrane-like member, and a sound absorption coefficient of the vibration of the membrane-like member at a frequency in at least one high-order vibration mode existing at frequencies of 1 kHz or higher is higher than a sound absorption coefficient at a frequency in a fundamental vibration mode.