A multilayer acoustic and shock absorbing cushion, consisting of a buffer layer, two waterproof moisture-permeable layers respectively mounted on the corresponding two sides of the buffer layer, and two surface layers respectively mounted on each side of the waterproof moisture-permeable layers away from or at a distance from by the buffer layer. The buffer layer, each of the waterproof moisture-permeable layers, and each of the surface layers are needle punched and bonded to form a single body. The multilayer acoustic and shock absorbing cushion of the present invention is primarily used in building partitions and wall systems to prevent noise and vibration produced when household residents are doing physical activities from disturbing other neighbors. The multilayer acoustic and shock absorbing cushion is further provided with advantages including acoustic and shock absorbing functions, anti-efflorescence ability, and good cement bonding stability.

A multilayer acoustic and shock absorbing cushion, consisting of a buffer layer, two waterproof moisture-permeable layers respectively mounted on the corresponding two sides of the buffer layer, and two surface layers respectively mounted on each side of the waterproof moisture-permeable layers away from or at a distance from by the buffer layer. The buffer layer, each of the waterproof moisture-permeable layers, and each of the surface layers are needle punched and bonded to form a single body. The multilayer acoustic and shock absorbing cushion of the present invention is primarily used in building partitions and wall systems to prevent noise and vibration produced when household residents are doing physical activities from disturbing other neighbors. The multilayer acoustic and shock absorbing cushion is further provided with advantages including acoustic and shock absorbing functions, anti-efflorescence ability, and good cement bonding stability.

A cushioning element for use in a vehicle, for example in an aircraft, includes at least one tuned absorber embedded within the cushioning element. The tuned absorber is tuned to absorb noise at a predetermined frequency of at least 20 Hz. A method of providing noise absorption within a cabin of a vehicle includes determining a predetermined frequency of at least 20 Hz of an undesirable noise within the cabin, and configuring an internal structure of a cushioning element to define a tuned absorber tuned to absorb noise at the predetermined frequency, the cushioning element in use being located in the cabin.

A cushioning element for use in a vehicle, for example in an aircraft, includes at least one tuned absorber embedded within the cushioning element. The tuned absorber is tuned to absorb noise at a predetermined frequency of at least 20 Hz. A method of providing noise absorption within a cabin of a vehicle includes determining a predetermined frequency of at least 20 Hz of an undesirable noise within the cabin, and configuring an internal structure of a cushioning element to define a tuned absorber tuned to absorb noise at the predetermined frequency, the cushioning element in use being located in the cabin.

An acoustic absorption structure includes: at least one acoustic element which has at least one cavity delimited by at least one enclosure comprising at least one first drainage orifice passing through the enclosure, and a rotational indexing system making it possible to position the acoustic element so that at least one first drainage orifice is positioned in proximity to or at a lowest point of the cavity. An aircraft propulsion assembly including such an acoustic absorption structure is also described.

An acoustic absorption structure includes: at least one acoustic element which has at least one cavity delimited by at least one enclosure comprising at least one first drainage orifice passing through the enclosure, and a rotational indexing system making it possible to position the acoustic element so that at least one first drainage orifice is positioned in proximity to or at a lowest point of the cavity. An aircraft propulsion assembly including such an acoustic absorption structure is also described.

A sound absorbing apparatus includes a first member including at least one first opening portion for enabling Helmholtz resonance, and a second member that is on the first member, has a plate shape or a sheet shape, and is formed of a porous material. The second member includes at least one second opening portion overlapping one-to-one with the at least one first opening portion in planar view. A periphery of each of the at least one second opening portion coincides with or is located outside a periphery of each corresponding one of the at least one first opening portion in planar view.

A mobile terminal booth with a sound masking function includes a sound absorbing panel which partitions a space as viewed from the above to provide a place where a user of a mobile terminal can have a telephone conversation; a speaker provided to emit sounds to an outside of the mobile terminal booth; and a masking sound generation unit provided to emit a masking sound through the speaker. The harsh-sounding high frequency components of the masking sound are attenuated so that the masking sound gives less uncomfortable feeling to persons surrounding the mobile terminal booth. This masking sound is generated by attenuating a high frequency component of a raw sound material including a natural sound.

A sound-absorbing member has a Helmholtz resonance structure including an inlet passage and a hollow portion connected to the outside through the inlet passage, wherein the sound-absorbing member includes a first layer and a second layer disposed on the first layer, the first layer includes a first main surface and a second main surface opposite to the first main surface, the second layer includes a third main surface facing the second main surface and a fourth main surface opposite to the third main surface, the first layer includes a first through-hole penetrating through the second main surface from the first main surface and defining the inlet passage, the second main surface includes a second main surface opening defining an end portion of the first through-hole and a second main surface flat portion, the third main surface includes a third main surface opening defining an end portion of the hollow portion and a third main surface flat portion, the second main surface opening has an opening area smaller than the opening area of the third main surface opening, and a first air layer is formed at least at a portion between the second main surface flat portion and the third main surface flat portion.

A sound-absorbing member has a Helmholtz resonance structure including an inlet passage and a hollow portion connected to the outside through the inlet passage, wherein the sound-absorbing member includes a first layer and a second layer disposed on the first layer, the first layer includes a first main surface and a second main surface opposite to the first main surface, the second layer includes a third main surface facing the second main surface and a fourth main surface opposite to the third main surface, the first layer includes a first through-hole penetrating through the second main surface from the first main surface and defining the inlet passage, the second main surface includes a second main surface opening defining an end portion of the first through-hole and a second main surface flat portion, the third main surface includes a third main surface opening defining an end portion of the hollow portion and a third main surface flat portion, the second main surface opening has an opening area smaller than the opening area of the third main surface opening, and a first air layer is formed at least at a portion between the second main surface flat portion and the third main surface flat portion.