Abstract: Disclosed is a sound absorption and load bearing integrated structure and a preparation method thereof. The sound absorption and load bearing integrated structure comprises of a first connecting node and a holed hollow rod connected to the first connecting node. The first connecting node is of a solid structure, and the connecting portion of the first connecting node and the holed hollow rod is in smooth transition by means of a cambered surface. The first connecting node and the holed hollow rod form a sound absorption unit. The holed hollow rod of one sound absorption unit extends forwards from an axial direction of the first connecting node, and extends to be connected to a first connecting node of another sound absorption unit, or extends to be intersected with a holed hollow rod of another sound absorption unit so as to form a second connecting node.

Abstract: A retractable stethoscope comprising a case, at least one piece of acoustic tubing, at least one ear piece, and a chest piece. The chest piece is coupled to one end of the acoustic tubing, and at least one ear piece is coupled to another end of the acoustic tubing. The length of the acoustic tubing may extend from and retract into the case from the ear piece end, the chest piece end of the acoustic tubing, or both ends either independently or simultaneously. The retractable stethoscope may further comprise a belt clip.

Abstract: A microelectromechanical systems (MEMS) diaphragm assembly comprises a first diaphragm and a second diaphragm, a geometric central region surrounding the geometric center of the diaphragm assembly, and a plurality of pillars connecting the first and second diaphragms, each of the plurality of pillars having a cross-sectional shape having a maximum radial dimension, A, and a maximum circumferential dimension, B, wherein at least a first subset of the plurality of pillars is disposed within the geometric central region and wherein A is greater than B for the at least first sub set.

Abstract: An acoustic-metamaterial acts as a sound reducing filter in that the level of sound that exits the structure is much less than the magnitude of sound that enters the structure. In forming the structure, modular stages of a given geometry are stacked upon one another to create a cell. Each stage of the cell is provided with a nozzle that is acoustically connected to the nozzles of other stages of the cell. The stages have chambers that are positioned radially or laterally outside of the respective nozzles, with the chambers of the cell being acoustically connected to one another. An amalgamation of cells are arranged in an adjacent formation, with chambers of the cells being acoustically connected to one another for purposes of protecting items, components and people from destructive levels of sound.

Abstract: A method for manufacturing a sound attenuating panel uses an alveolar-core structure including a first edge and a second edge separated by alveolar cells, the alveolar cells including walls extending from the first and second edges and defining a primary conduit for the circulation of a sound wave that is to be attenuated. The method includes covering the first edge or the second edge of the alveolar-core structure with a compartmentation wall; deforming the compartmentation wall to define at least one secondary conduit for the circulation of a sound wave that is to be attenuated, the secondary conduit extending at least partially within said primary conduit; and creating an opening in the compartmentation wall to permit communication between the primary and secondary conduits.

Abstract: A package structure of a micro speaker is provided. The package structure includes a substrate having a hollow chamber, a diaphragm suspended over the hollow chamber, a coil embedded in the diaphragm, a carrier board disposed on a bottom surface of the substrate, a first permanent magnetic element disposed on the carrier board and in the hollow chamber, and a lid wrapped around the substrate and the diaphragm. The diaphragm includes an etching pattern. One end of the lid exposes a portion of the top surface of the diaphragm.

Abstract: Provided is a silencing member for an electrified vehicle, which can suitably reduce a narrow band sound generated by a motor or the like, can handle a plurality of frequencies, can prevent generation of a wind noise, and can be miniaturized and thinned.

Abstract: A fluid silencer includes: an expansion pipe disposed on a pipe through which a fluid containing noise sources flows and having an accommodation space therein; a viscous fluid received in the accommodation space; a noise introducing member disposed between the pipe and the expansion pipe to seal the accommodation space and allowing the noise sources to be introduced into the accommodation space therethrough; at least one partition member disposed in the accommodation space and dividing the accommodation space in a flow direction of the fluid; multiple baffle members disposed on one surface of the partition member and forming multiple sound absorbing spaces into which the noise sources introduced into the accommodation space are dispersedly introduced; and an elastic member disposed between the partition member and the baffle members and contracted/expanded by the viscous fluid entering/leaving the sound absorbing spaces as the noise sources are introduced into the sound absorbing spaces.

Abstract: To provide a sound insulation sheet member which is excellent in sound insulation performance in a low frequency band and which has a compact configuration. A sound insulation sheet member 1 including a substrate 2 and a concavo-convex structure 3 placed on at least one surface of the substrate 2, in which the concavo-convex structure 3 is provided by repeatedly arranging a plurality of units each defined as a concavo-convex unit shape 4 including a linear convex portion 5, in one direction at substantially constant intervals on the surface of the substrate 2.

Abstract: Systems and methods are disclosed for securing fabric to speaker-based devices. An example device may include a housing having a first portion devoid of apertures, and a second portion having a first number of apertures. The device may include a fabric disposed about the housing, and an adhesive disposed between the fabric and the housing. The adhesive may include a first portion disposed between a first portion of the fabric and the first portion of the housing, and a second portion disposed between a second portion of the fabric and the second portion of the housing. The first portion of the adhesive may have a patterned non-liquid material that is bonded, and the second portion of the adhesive may have the patterned non-liquid material that is unbonded.

Abstract: The present teachings generally relate to an acoustic panel including a backing layer, honeycomb core attached to the backing layer, a mesh layer attached to the honeycomb core, and a face sheet including a flexible acoustic fabric face sheet attached to the mesh layer. The acoustic fabric face sheet can provide improved sound dampening characteristics over, for example, a perforated face sheet, and at a lower manufacturing cost, weight, and a simplified manufacturing process. The acoustic fabric face sheet can be or include a flexible woven and/or knitted fabric including a polymer such as an aromatic polyamide that includes a meta-aramid fiber, or a fiberglass fabric.

Abstract: A device for canceling acoustic noise generated includes, in one example, an inlet channel configured to be fluidly connected to an inlet port of a pump and an outlet channel configured to be fluidly connected to an outlet port of the pump. The device also includes an inlet resonator and an outlet resonator, both having open ends and closed ends. The open ends of the inlet and outlet resonators are fluidly connected to the inlet and outlet channels, respectively. When in operation, the inlet and outlet resonators can cancel noise generated by the operation of the pump.

Abstract: An apparatus, a system, and a method are disclosed for enhancing a sound of an engine having a turbocharger. The apparatus is used with a vehicle having a turbocharger that includes a recirculation hose that is disconnected from the system. A short section of hose is assembled to a blow-off valve and a sound modification apparatus that includes a horn end and an attachment portion. The attachment portion is connected to an outlet end of the short section of hose. The horn end has a conical end through which a first tone is emitted when vented gases pass inside the horn and a plurality of arcuate opening through which a second tone is emitted.

Abstract: A method for manufacturing a sound-absorbing panel with a sandwich structure for reducing noise impact of an aeronautic engine includes providing a first skin of a thermoplastic polymeric material, making a plurality of micro-holes through the first skin by mechanical punching of the first skin, securing the first skin to a central layer by arranging a structural adhesive layer between the first skin and the central layer and/or by a thermal weld between the first skin and the central layer, and securing the central layer to a second skin by arranging a structural adhesive layer between the central layer and the second skin and/or by a thermal weld between the central layer and the second skin.

Abstract: An acoustic attenuation structure for a gas turbine engine includes a periodic structure having a first unit cell, the first unit cell having a first central body and a first axial tube disposed on the first central body and a second axial tube disposed on the first central body, opposite the first axial tube, each of the first axial tube and the second axial tube being in fluid communication with one another through the first central body.

Abstract: Disclosed are a speaker and a portable terminal, where the speaker includes: an active vibrating unit, including a first vibrating diaphragm vibrating for radiating a sound, and a voice coil assembly for fixing and driving the first vibrating diaphragm; a passive vibrating unit, including a second vibrating diaphragm and driven by the active vibrating unit to vibrate; and a magnetic circuit system, acting with the voice coil assembly to drive the first vibrating diaphragm of the active vibrating unit to vibrate, where the magnetic circuit system is arranged between the first vibrating diaphragm and the second vibrating diaphragm, a first acoustic cavity is defined between the magnetic circuit system and the first vibrating diaphragm, and a second acoustic cavity is defined between the magnetic circuit system and the second vibrating diaphragm.

Abstract: Compressor head fixing device, a compressor and a refrigeration device. The compressor head fixing device includes a cylinder block and a cylinder head cover, the cylinder head cover being connected to the cylinder block by a fastener, the cylinder block being provided with a compression chamber and an assembly hole configured to fix the fastener; a noise reduction chamber, provided on the cylinder block; and a communication passage, provided in the cylinder block and the cylinder head cover, and being in communication with the assembly hole, the noise reduction chamber and the compression chamber. The compressor head fixing device has a compact structure, a length of the exhaust passage is shortened and the exhaust pressure is reduced.

Abstract: A serrated stethoscope tube is disclosed herein. The serrated stethoscope tube includes a tubular body portion, the tubular body portion having an exterior surface and an interior surface, the interior surface being oppositely disposed relative to the exterior surface, and the interior surface of the tubular body portion having a plurality of channels formed therein for reducing sound wave refraction and/or reverberation.

Abstract: A stethoscope and binaural assembly are disclosed herein. The stethoscope includes a stethoscope chestpiece assembly and a binaural assembly including a first ear tube, a second ear tube, and an acoustic tube connected to the first and second ear tubes, the first ear tube being flexibly connected to the second ear tube by at least one spring member disposed inside the acoustic tube, a portion of the at least one spring member being located proximate to a sound transmission junction of the acoustic tube, the binaural assembly further including a junction blockage prevention member, the junction blockage prevention member configured to prevent one or more internal sound passageways of the sound transmission junction of the acoustic tube from becoming blocked or partially blocked by the at least one spring member when the first and second ear tubes are flexed outwardly away from one another by a user.

Abstract: A vehicle comprising: an internal combustion engine having a cylinder and an exhaust manifold for collecting exhaust gases expelled from the cylinder; an exhaust system configured to channel exhaust gases along a flow path from the exhaust manifold to an exhaust outlet, the exhaust system comprising an exhaust component configured to cause an alteration to engine-generated sound pulses passing through the exhaust component; and a sound bypass device comprising a sound inlet port at a first location on the exhaust system before a first exhaust component along the flow path and a sound outlet port at a second location on the exhaust system after the first exhaust component along the flow path, the sound bypass device being configured to transmit engine-generated sound pulses from the sound inlet port to the sound outlet port whilst preventing flow of exhaust gases from the sound inlet port to the sound outlet port.