Abstract: A noise reduction assembly includes an outer frame and a partition plate. An accommodating cavity is arranged in the outer frame; the partition plate is arranged in the accommodating cavity, and the partition plate and the outer frame form a noise reduction channel, the noise reduction channel includes a first noise reduction section, a second noise reduction section and a third noise reduction section that are communicated in sequence, and the channel cross-sectional areas of the first noise reduction section and the third noise reduction section are both smaller than the channel cross-sectional area of the second noise reduction section. The technical solution of the present application may reduce the noise of a new energy equipment having the noise reduction assembly during operation.

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: An oscillatory actuator 1 includes: an in-case electromagnetic driver 3; a mover 4; and a pair of leaf springs 5a and 5b for supporting the mover 4. The mover 4 includes a magnet 30, pole pieces 31a and 31b paired, and masses 32a and 32b paired. The in-case electromagnetic driver 3 includes coils 21a and 21b paired and a tubular yoke 20 radially outside the coils 21a and 21b, the yoke being made of a soft magnetic material and projecting outward beyond the coils 21a and 21b along the oscillation axis O. Along the oscillation axis O, an average length Ly of the yoke O is equal to or longer than the sum of an end-to-end length Lp of the pole pieces 31a and 31b paired and the double of a one-way amplitude La of an oscillation of the mover 4, i.e., Ly?the sum (Lp+2La).

Abstract: A structural body including a plurality of convex-shaped rubber-elastic resonant portions, and a sheet-like support that supports the resonant portions. A specific gravity of the resonant portions is 1.0 g/cm3 or more and 3.0 g/cm3 or less, a height of the resonant portions is from 50 ?m to 100 mm, and an areal density of the support is 1.0 kg/m2 or less.

Abstract: A biokinetic energy collection apparatus and a fabrication method thereof are provided. The apparatus includes: a counter weight, configured to oscillate with a movement of a wearer, to convert a mechanical energy generated by the movement into kinetic energy of the counter weight; a rotating frame, mechanically coupled to the counter weight, and configured to receive the kinetic energy from the counter weight; a planetary gear train, mechanically coupled to the rotating frame, to rotate as the rotating frame moves; and a stator assembly and a rotor assembly, coupled to each other, where the stator assembly includes a coil, the rotor assembly includes a rotor and a third permanent magnet located on the rotor, and the rotor is mechanically coupled to the planetary gear train and receives the kinetic energy from the planetary gear train, to cause the third permanent magnet to rotate with the rotor.

Abstract: In accordance with an embodiment, a noise reduction device includes a housing; and a slit located inside the housing and having a unit cell located therein, the unit cell comprising a sound absorbing layer configured to absorb noise generated from a sound source inside the housing, and a meta-material panel layer located on one surface of the sound absorbing layer, the meta-material panel layer comprising a sound meta-material.

Abstract: A power tool including an air inlet and an inlet muffler disposed within the air inlet, the inlet muffler comprising a plurality of inlet ports, each of the plurality of inlet ports comprising a peripheral surface defining a port aperture therethrough, at least one of the plurality of inlet ports further comprising a damper material provided on the peripheral surface of the at least one inlet port and further defining the port aperture therethrough.

Abstract: A silencer module for an air handling unit includes a first baffle and a second baffle spaced apart from the first baffle to form an air channel between the first baffle and the second baffle. The air channel is configured to receive a fluid flow and direct the fluid flow through the silencer module. The silencer module also includes a reactive acoustic feature formed in the first baffle. The reactive acoustic feature includes an attenuation profile configured to reduce propagation of tonal acoustic waves through the air channel.

Abstract: An object of the present invention is to provide a structural body that has high vibration damping and high sound-insulating performance which exceeds mass law while being relatively light weight, that is highly flexible in design, excellent in versatility, and easy to manufacture so that productivity and economic efficiency can be improved. The object thereof is achieved with a sheet member of a sheet having a thickness of 1 mm or less and having rubber elasticity and a resonant portion, wherein the resonant portion is provided in contact with a surface of the sheet, the resonant portion including a base part and a weight part, and the weight part being supported by the base part and having a larger mass than the base part.

Abstract: Provided is a rotor of an interior permanent magnet synchronous motor, including a plurality of poles, wherein each of the plurality of poles includes a plurality of magnets, and the plurality of magnets is provided in such a manner that a magnetomotive force resulting from each magnet becomes weaker with increasing distance from a magnet center.

Abstract: Provided is an intake bypass recirculation structure capable of silencing, including: an intake bypass recirculation structure body and a structure-conducted silencing device. An intake bypass recirculation cavity is provided on the intake bypass recirculation structure body. An inlet of the intake bypass recirculation structure and an outlet of the intake bypass recirculation structure that are provided on the intake bypass recirculation structure body are each connected to the intake bypass recirculation cavity. The structure-conducted silencing device is disposed inside the intake bypass recirculation cavity. In this application, during working, noise generated by a compressor is transmitted into the intake bypass recirculation cavity via an inlet of the intake bypass recirculation structure, and transmitted outside via the outlet of the intake bypass recirculation structure.

Abstract: A diaphragm for an electroacoustic transducer includes a paper substrate containing cellulose fibers as a main component and is configured such that a first surface region with a predetermined thickness from a first surface of the paper substrate has a greater total amount of coloring particles than a second surface region with a predetermined thickness from a second surface of the paper substrate, the second surface being opposite to the first surface.

Abstract: A compressor assembly having a high velocity muffler system which produces a particle-free compressor pump feed while reducing noise output from the compressor assembly during compressing operations. The high velocity muffler system is maintenance-free and comprises an inertia filter. The compressor assembly uses a method for producing a compressor pump feed and reducing noise during compressing operations by processing a gas through the high velocity muffler system which has an inertia filter and a muffler chamber to produce a compressor pump feed which can be compressed by a pump assembly.

Abstract: It is described a metamaterial sound insulation device, with improved efficiency in dampening sound transmission across it compared to a traditional sound insulation device having comparable size and weight. The device is especially adapted for sound insulation in the automotive field.

Abstract: A motor includes a rotor and a stator. The rotor comprises a rotating shaft and an impeller. The impeller couples with the rotating shaft and has a hub. The hub has an outer surface, an inner surface, a plurality of first through holes and a plurality of second through holes. The first through holes are disposed nearer the rotating shaft than the second through holes. The stator comprises a silicon steel sheet and a bearing assembly. The silicon steel sheet has an annular portion and a plurality of protruding portions. The rotating shaft couples with the bearing assembly and penetrates within an inner hole of the annular portion. Each protruding portion is extended outward from the annular portion and has an extending length. The distance between the first through hole and the nearest second through hole is in a range of 0.3 to 1.2 times of the extending length.

Abstract: A silencer for installation in an air duct, in particular in a flat duct, having at least one sound-absorbing damping element extending essentially in a longitudinal direction (X), and having at least one holding device which accommodates the damping element at least in sections and has a fastening device for fixing the silencer in the air duct. An assembly comprising an air duct and such a silencer is further described.

Abstract: A dynamic acoustic jacket device and a dynamic acoustic jacket system, that includes a single piece of material folded into acoustic jacket for covering a lighting fixture, using locking devices or the cut away portion of the device, to quickly and easily install the acoustic jacket over suspension cables so that the acoustic jacket can be lowered and raised over the lighting fixture without the need to be attached thereto.

Abstract: The present invention relates to an electric machine (1) having a rotor (3) and a stator (2), wherein the stator (2) and/or the rotor (3) has an electrical plug-in winding (4), which comprises a plurality of rigid insulated electrical conductor elements (5); the conductor elements (5) are arranged in grooves of the stator or of the rotor and their conductor ends (17) project out of the grooves; the conductor ends of the conductor elements (5) are each connected to conductor ends of other conductor elements (5) in order to form the electrical plug-in winding (4); the conductor elements (5) have an electrically insulating insulation sheath (9); characterized in that each conductor element (5) has a multiplicity of flexible fibres (8), in particular of a conductor strand of flexible fibres (8), made of carbon nanotubes or graphene and in that the insulation sheath (9) surrounds the multiplicity of fibres (8) like a hose and is designed in such a way that it gives the electrical conductor element (5) a rigid form

Abstract: A hearing device containing a housing enclosing a housing interior, and a loudspeaker for generating acoustic signals. In addition, the hearing device contains a damping element formed by a damping mat, which is interposed between the loudspeaker and a wall of the housing or a loudspeaker box. The damping mat contains at least one damping chamber filled with fluid.

Abstract: The present disclosure relates to the field of new energy, and provides a laminated busbar assembly, a motor controller, a drive assembly, and a vehicle. The laminated busbar assembly includes a main circuit board, a positive and a negative electrode connection plates, and a three-phase connection plate assembly, which are laminated in sequence. The positive and the negative electrode connection plates, and the three-phase connection plate assembly are each provided with pins arranged circumferentially. The present disclosure designs a laminated arrangement and an annular arrangement of pins, thereby improving the device integration and space utilization, effectively reducing the occupied space, and realizing high integration of the motor controller and the drive assembly.