Abstract: The present invention relates to the field of rotary imaging, in particular to a rotary imaging system, a rotary imaging method and a rotary device. A rotary imaging system of a rotary device comprises a rotating body with a lamp belt module group; a circuit board installed on the rotating body, the circuit board rotating synchronously with the rotating body; an acceleration detection component installed at a predetermined position on the circuit board for acquiring acceleration detection data at the predetermined position when the circuit board rotates; and a control module used for obtaining an acceleration value of the predetermined position based on the acceleration detection data, further obtaining a rotation speed value of the circuit board based on the acceleration value and a position parameter corresponding to the predetermined position, and driving the lamp belt module group to realize rotary imaging based on the rotation speed value.

Abstract: In a soundproof member 10 including a polyurethane foam 11 and disposed apart from an engine E on a vehicle interior side of a dash panel 50 partitioning a space into an engine room having the engine E as a sound source and a vehicle interior, the polyurethane foam 11 has a surface layer 12 on at least a part of the surface thereof, a one side surface of the polyurethane foam 11 directly facing the vehicle interior side of the dash panel 50 has at least a surface layer 12A in an open cell state or a core, and a surface layer 12B of the other side surface opposite to the one side surface is a surface layer in a closed cell state.

Abstract: A speaker diaphragm includes a first polymer and a second polymer. The first polymer and the second polymer undergo phase separation. The first polymer is a polyolefin, and the second polymer is a thermoplastic resin being immiscible with the polyolefin. One of either the polyolefin or the thermoplastic resin constitutes a sea phase, and another one of either the polyolefin or the thermoplastic resin constitutes island phases being interspersed in the sea phase.

Abstract: A reciprocating piston air compressor includes a programmable logic controller, a tank, a motor, a pump, a variable speed drive, a head unloader and a cooling system. The programmable logic controller and/or variable speed drive are utilized to monitor the operating state of the air compressor and to control various operational variables, such as motor and pump speed. The air compressor can utilize the variable speed drive to operate a three phase motor on single-phase power.

Abstract: A seismometer with high sensitivity, broadband and all-dip is provided, The which relates to the technical field of seismometer, including a first force feedback module, an insulator, a top cover, a terminal post, an upper leaf spring, a mass block, a casing, a sealing ring, an insulation gasket, a guide spring, a wire frame, a magnetic shoe, a compensation ring, a lower leaf spring, a bottom cover, a second force feedback module and a third force feedback module. It provides the broadband seismometer technology based on dynamic force balance feedback and the all-dip broadband seismometer technology based on dip angle perception, which breaks through the limitations of conventional seismometers in sensitivity, frequency band, and dip angle, and truly realizes a seismometer with high sensitivity, broadband, and all-dip.

Abstract: A laminated sheet includes a first porous layer including a plurality of fibers of at least one of inorganic fiber or carbonized fiber; and a second porous layer formed of a plurality of organic fibers, wherein the laminated sheet has a surface density of greater than or equal to 400 g/m2 and less than or equal to 1550 g/m2, wherein the second porous layer is formed of the plurality of organic fibers having a mean diameter of fibers being greater than or equal to 0.5 ?m and less than or equal to 14 ?m, and wherein, expressing a total volume of solids and voids filling a unit volume of the second porous layer as 100%, a percentage of the solids is greater than or equal to 1.0% and less than or equal to 8.0%.

Abstract: A phonon parametric oscillator is provided. The phonon parametric oscillator comprises a laser for periodically emitting brief optical pulses (IL), an assembly for generating acoustic pulses (IA) and a medium for coupling the acoustic pulses to an object (O), the assembly for generating acoustic pulses comprising an entrance face, an exit face, a conversion medium for converting the brief optical pulses into acoustic pulses and a propagation medium for propagating said acoustic pulses, the entrance and exit faces being reflective to the acoustic pulses, the propagation medium having a defined thickness, the exit face making contact with the coupling medium. In the phonon parametric oscillator according to the invention, the round-trip time of an acoustic pulse due to reflection from the entrance and exit faces, is equal to the emission period (?) of the laser, so that the reflected acoustic pulse is in phase with the following acoustic pulse.

Abstract: A sound-absorbing material for vehicles that is mounted to a vehicle interior and that is provided with a main body in which at least a fibrous material and a skin material are integrally molded. The sound-absorbing material for vehicles is characterized in that a sound-absorbing section provided to at least part of the main body is formed so as to be mounted to the vehicle interior within a range in which the vertical distance Elh from the lower surface of the head rests of the front seats downward is 0.1-0.4 m, and in that the air flow resistance AFR (Ns/m3) and the vertical distance Elh (m) satisfy 210<AFR+10/Elh<3020.

Abstract: A sound damping wallboard and methods of forming a sound damping wallboard are disclosed. The sound damping wallboard comprises a gypsum layer with a gypsum surface having an encasing layer. The encasing layer is partially removed to expose the gypsum surface and form a gypsum surface portion and a first encasing layer portion on the gypsum layer. A sound damping layer is applied to the gypsum layer to cover at least part of the gypsum surface portion and the encasing layer portion.

Abstract: Provided is a composition for a sound insulating sheet member, a sound insulating sheet member, and a sound insulating structure body with excellent sound insulating performance. A sound insulating structure body including: a plurality of convex-shaped rubber-elastic resonant portions; and a sheet-like support that supports the resonant portions, wherein the resonant portions have a storage modulus G? obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of 100 MPa or less at 25° C. and 10 kHz, and the areal density of the support is 1.0 kg/m2 or less.

Abstract: The present invention provides a sound-absorbing material having sound absorption performance with an average sound absorption coefficient of 0.70 or more in the frequency range of 800 to 5000 Hz. The present invention provides a sound-absorbing material including: a fiber layer including a plurality of holes open to a surface thereof and having a thickness of 3 mm or more; and an inorganic material layer mainly containing a calcium-based material and having a thickness of 0.4 to 0.6 mm on the surface of the fiber layer, the holes being blind holes each penetrating through the inorganic material layer and having a bottom inside the fiber layer, each hole having a depth corresponding to 50 to 90% of the thickness of the fiber layer.

Abstract: An object of the present invention is to provide a soundproof material having a practically useful high-level sound absorption coefficient that while maintaining thinness, and further having an expanded sound-absorbable frequency region. A means for solving the problem is a soundproof material comprising: a surface cover layer composed of a fiber material; a back-surface layer laminated onto the surface cover layer, and composed of a porous material with voids interconnected with each other; and a joining layer laminated between the surface cover layer and the back-surface layer, and composed of a joining material, wherein the fiber material has an average fiber diameter of 1 to 10 ?m and an air-permeation volume of 5 to 200 cm3/cm2·sec, and wherein the joining layer has a joint area percentage of 50 to 95% with respect to the entire surface where the surface cover layer and the back-surface layer face each other.

Abstract: The present invention concerns an attenuation device (1) of the fluid flow pulsation along a duct of a hydraulic circuit connected with a hydraulic machine, comprising at least an attenuation module (3) passed through by a pass-through duct (5) configured to be placed in fluid communication with said duct of said hydraulic circuit. In particular, in said attenuation module (3) a first duct (7) is obtained having an opened first end (70) in fluid communication with said pass-through duct (5), and a closed second end, said first duct (7) extending along a curved line comprising a plurality of curved sections, said first duct (7) being adapted to attenuate the pulsation of said fluid flow along said duct of said hydraulic circuit to reduce the vibrations generated by said pulsation of said fluid flow.

Abstract: A sound insulation material 1 includes a first layer 10 constituted by a polyurethane foam, a second layer 20 that is laminated on a surface of the first layer, the surface being located on a first side, and that is constituted by a sheet-shaped member made from a material other than polyurethane, and a third layer 30 that is laminated on a surface of the second layer, the surface being located on the first side, that is constituted by a polyurethane foam, and that, over its entirety, has a higher density than the density of at least a portion of the first layer.

Abstract: An acoustic liner is provided. The acoustic liner includes a face sheet, a back sheet spaced from the face sheet, and a core layer defining a cellular structure disposed between the face sheet and the back sheet. The core layer includes a plurality of first resonant cells coupled to the back sheet. Each of the first resonant cells includes a first cell wall coupled to the back sheet along a first cell wall base edge, the first cell wall extending from the back sheet toward the face sheet, the first cell wall further coupled to the face sheet along a first cell wall top edge, wherein the first cell wall of each of the first resonant cells comprises a surface extension that extends from a surface of the first cell wall.

Abstract: A self-powered mountable speaker bar may include a rechargeable battery and a set of mounting features for use during recreational activities such as powersports, boating, and off-roading. The self-powered mountable speaker bar may include a housing and a set of mounting features that allow the housing to be securely coupled to a vehicle component or other appropriate support. The rechargeable battery may be removeable and may include a set of coupling features such as spring-loaded tabs associated with complementary features of the housing, such as slots. The self-powered mountable speaker bar may include a wireless communication module that interacts with user devices such as smartphones. The housing may be waterproof, dustproof, and/or shock-proof.

Abstract: A dual layer nonwoven acoustic insulating material having a more densified layer and a less densified layer that is comprised of shoddy fibers and other fibers.

Abstract: A bell and hammer rotational device is shown and described. The bell and hammer rotational device includes a frame which is made up of at least two side walls. The frame has a spindle rotatably secured thereto. A rotational device is coupled to the spindle such that the spindle will rotate the rotational device, when the spindle is rotated. At least one bell is secured about a perimeter of the rotational device. A bell hammer is secured to the frame. The bell hammer is positioned such that it will strike the at least one bell, at least once, with each revolution of the rotational device.

Abstract: A housing for an aero-acoustic processing machine having rotational drive apparatus coupled to rotate an air impeller to draw air and material to be processed through an axial inlet system and expel the air and processed material through a transverse outlet. The housing includes an enclosure incorporating at least one layer of noise attenuation materials surrounding the aero-acoustic processing machine, the enclosure having a material inlet port, an air inlet port and an exhaust port for outputting processed product with air. Airflow paths that are required for operation of the aero-acoustic processing machine are provided to enable airflow into the housing whilst significantly reducing noise emission.

Abstract: The disclosure relates to acoustic panels and methods for preparing them. The disclosure relates more particularly to panels having a porous facing and to methods for making such panels. One aspect of the disclosure is an acoustic panel comprising a base structure. The base structure has one or more edges, an outward major surface having a total area, and an inward major surface opposing the outward major surface. The base structure has a noise reduction coefficient (NRC) of at least about 0.3. The panel includes a coating layer directly disposed on the outward major surface of the base structure, the coating layer being formed of an open-cell foam. The coating layer has an exterior major surface opposing the outward major surface of the base structure. The coating layer is substantially scattering for light in the wavelength range of 380 nm to 780 nm, and has an absorption coefficient of less than 0.5 for acoustic frequencies in the range of 100 Hz to 10,000 Hz.