The present invention provides a structure that improves sound absorption coefficient. The present invention provides a structure comprising: a foam resin layer formed of a foam material having a foaming ratio of 1.1 to 8 times; and a sound absorbing layer formed of a foam material having a foaming ratio of 10 to 30 times, the sound absorbing layer laminated on the foam resin layer.

Examples are disclosed that relate to attenuating fan noise in a computing storage system comprising magnetic data storage devices. One example provides a computing storage system comprising an enclosure, a plurality of magnetic data storage devices positioned within the enclosure, one or more fans positioned to cool the magnetic data storage devices, and an acoustic attenuator located between the plurality of magnetic data storage devices and the one or more fans. The acoustic attenuator comprises a plurality of airflow channels each defined by one or more internal walls of the acoustic attenuator, wherein at least one of the plurality of airflow channels is configured to block a line of sight between the plurality of magnetic data storage devices and the one or more fans.

Examples are disclosed that relate to attenuating fan noise in a computing storage system comprising magnetic data storage devices. One example provides a computing storage system comprising an enclosure, a plurality of magnetic data storage devices positioned within the enclosure, one or more fans positioned to cool the magnetic data storage devices, and an acoustic attenuator located between the plurality of magnetic data storage devices and the one or more fans. The acoustic attenuator comprises a plurality of airflow channels each defined by one or more internal walls of the acoustic attenuator, wherein at least one of the plurality of airflow channels is configured to block a line of sight between the plurality of magnetic data storage devices and the one or more fans.

A sound management enclosure, production, and recapture device may include a generally symmetrical design and may be constructed and arranged to optionally internally mount components therein. The sound management device may be constructed and arranged to alter, focus, or dissipate sound waves within a predictable environment in order to enhance the associated effects. Sound capturing devices, such as microphones, may be placed within the sound management enclosure for transmission to an external system for recording or projection.

A sound isolation device includes at least one degenerate acoustic scatterer having a plurality of channels. The plurality of channels may include three or more channels. The channels have an open end and a terminal end, wherein the terminal ends of the channels are separate from one another. The at least one degenerate acoustic scatterer has an acoustic monopole response and an acoustic dipole response that have a substantially similar resonant frequency.

A sound isolation device includes at least one degenerate acoustic scatterer having a plurality of channels. The plurality of channels may include three or more channels. The channels have an open end and a terminal end, wherein the terminal ends of the channels are separate from one another. The at least one degenerate acoustic scatterer has an acoustic monopole response and an acoustic dipole response that have a substantially similar resonant frequency.

A glass wool panel, intended to be used as an acoustic panel, has a density of less than or equal to 130 kg/m.sup.3, an air flow resistivity of between 30 and 120 kPa.Math.s/m.sup.2, a Young's modulus of between 0.5 and 4 MPa.

A glass wool panel, intended to be used as an acoustic panel, has a density of less than or equal to 130 kg/m.sup.3, an air flow resistivity of between 30 and 120 kPa.Math.s/m.sup.2, a Young's modulus of between 0.5 and 4 MPa.

An exhaust device (108) for a vehicle is provided. The exhaust device (108) includes an outer shell (202), an inlet (206) to receive exhaust gases, an outlet (208), an inner shell (204) received within the outer shell (202), a pair of partition walls (216) and a Helmholtz neck (220). The inner shell (204) defines an inner volume (210). A plurality of first circumferential openings (212) extending through the inner shell (204) fluidly communicates the inlet (206) with the inner volume (210). A plurality of second circumferential openings (214) extending through the inner shell (204) fluidly communicates the outlet (208) with the inner volume (210). The pair of partition walls (216) is disposed between the inner shell (204) and the outer shell (202). The pair of partition walls (216), the inner shell (204) and the outer shell (202) define a Helmholtz chamber (218) therebetween. The partition walls (216) seal the Helmholtz chamber (218) from the inlet (206) and the outlet (208). The Helmholtz neck (220) is disposed on the inner shell (204) or one of the pair of partition walls (216).

An exhaust device (108) for a vehicle is provided. The exhaust device (108) includes an outer shell (202), an inlet (206) to receive exhaust gases, an outlet (208), an inner shell (204) received within the outer shell (202), a pair of partition walls (216) and a Helmholtz neck (220). The inner shell (204) defines an inner volume (210). A plurality of first circumferential openings (212) extending through the inner shell (204) fluidly communicates the inlet (206) with the inner volume (210). A plurality of second circumferential openings (214) extending through the inner shell (204) fluidly communicates the outlet (208) with the inner volume (210). The pair of partition walls (216) is disposed between the inner shell (204) and the outer shell (202). The pair of partition walls (216), the inner shell (204) and the outer shell (202) define a Helmholtz chamber (218) therebetween. The partition walls (216) seal the Helmholtz chamber (218) from the inlet (206) and the outlet (208). The Helmholtz neck (220) is disposed on the inner shell (204) or one of the pair of partition walls (216).