108results about How to "Absorb noise" patented technology

The invention relates to water permeable bricks produced by using building waste residue and a manufacturing method thereof. The manufacturing method is characterized by comprising the following steps: mechanically stirring a lower-layer brick material, which is formed by uniformly mixing building waste residue powder, waste glass powder, fly ash, portland cement, calcium oxide, calcium sulfate, sodium chloride, rosin pyrolytic polymer, calcium sulfonate, sodium sulfate, sodium aluminate and water, to be in a moist state, then performing mechanical vibration extrusion to form lower-layer bricks, further uniformly distributing an upper-layer brick material, which is formed by uniformly mixing marble waste residue powder, bentonite, talcum powder, iron oxide and water, on the upper parts of the lower-layer bricks through a secondary material distributing machine for forming a layer of surface material, then preparing water permeable adobe under the pressure of 25-30MPa, further performing steam curing, heating, keeping temperature constant and naturally cooling down to prepare water permeable brick products by using the building waste residue. The products have multiple functions of having water permeability, gas permeability and water retention property, reducing the temperature, reducing the noise, regulating the climate, eliminating the heat island effect of an urban, improving the air quality, keeping the circulation of surface water and the like, and have the advantages and effects of no pollution, low cost and good benefits.

An aircraft engine assembly is provided that is adapted to reduce noise produced by an engine included in the engine assembly. The engine assembly includes a nacelle having an inlet section and a main section that is houses the engine and fan assembly associated with the engine. The inlet section is coupled to the main section at a main bulkhead junction between the inlet section and the main section. A one piece annular acoustic panel is located within a recess in an internal wall of the nacelle. The annular acoustic panel extends from a forward portion of the inlet section to a forward portion of the main section such that the bulkhead is covered by the annular acoustic panel.

An exhaust system for a vehicle, such as a motorcycle or other straddle-type vehicle, that achieves miniaturization while providing advantageous noise reduction characteristics. The exhaust system is associated with an engine of a vehicle and includes an exhaust pipe connected to the engine and a silencer. A conical member is positioned within the silencer and includes an upstream end and a downstream end. At least a portion of a side wall of the conical member includes a plurality of through-holes. The conical member is oriented such that a radial dimension of the conical member increases in a direction from the upstream end to the downstream end.

The invention discloses a sound insulation board. According to the sound insulation board, one side of the sound insulation board is provided with a perlite surface of which the surface is in a fluffy shape; a cavity is formed in the plate body at intervals; micropores are formed between the cavity and a bottom layer of the perlite layer; the other side of the sound insulation board is provided with a ceramsite cement solid surface; a reinforced steel bar mesh is arranged on the bottom layer of the plate body, and a steel wire mesh is arranged on an upper layer of the plate body; and a composite board is a one-step molding body. The sound insulation board has the advantages that the plate surface is in the fluffy shape, and sound waves can be absorbed and weakened; the composite board has an integral structure, and the plate body is solid, is wholly conveniently mounted and used and is difficult to damage; sound absorption or sound insulation materials can be filled in the cavity, and a noise reduction effect is improved; and moreover, the sound insulation board can be made of cement, perlite, ceramsite and other light-weight materials and is wide in material source and low in construction cost, and the materials and cost are saved.

An orthotropic lattice structure interconnects porous surfaces of the flap with internal lattice structured perforations to equalize the steady pressure field on the flap surfaces adjacent to the end and to reduce the amplitude of the fluctuations in the flow field near the flap end. The global communication that exists within all of the perforations provides the mechanism to lessen the pressure gradients experienced by the end portion of the flap. In addition to having diffusive effects (diffusing the incoming flow), the three-dimensional orthogonal lattice structure is also reactive (acoustic wave phase distortion) due to the interconnection of the perforations.

The invention relates to a curb produced by using waste ceramic slag and waste road concrete and a manufacturing method. The curb is characterized in that the waste ceramic slag, the waste road concrete, waste incineration residue, waste granite slag, silicate cement, calcium oxide powder, calcium sulfate powder, polycarboxylate efficient water reducing agent, calcium formate, sodium sulfate and water are used as raw materials; and the raw materials are stirred to be moist through a stirrer, extruded by using a hydraulic machine and manufactured into the waste ceramic slag and waste road concrete curb under the pressure of 25 to 30MPa, and the curb is naturally dried and cured for 28 days at normal temperature by using a water spraying method. The raw materials can be manufactured into top wall bricks, plaza bricks and sidewalk bricks with different sizes; and the curb has the advantages of light weight, high strength, pollution prevention, low cost and high benefits. The invention meets the requirements for national energy conservation and emission reduction development and low-carbon economy.

The invention provides a metal glass metamaterial with a chiral microstructure. Traditional chiral structural design is applied to a metal glass material. The metal glass metamaterial comprises a cylinder made from the metal glass material and ligaments connected with the cylinder in a tangent mode. The overall mechanical property of the structure can be regulated and controlled by changing the number, the thickness, the length and the arranging mode of the ligaments and the radius of the cylinder. According to the metal glass metamaterial with the chiral microstructure, through perfect combination of the advantages of the chiral structure and the metal glass material, the mechanical properties of a traditional multi-hole material, chiral material and metal glass are greatly improved, the light effect and the negative Poisson ratio can be achieved, the metal glass metamaterial is high in elasticity and strength and large in plasticity, a large-scale metal glass metamaterial is expected to be prepared, and the metal glass metamaterial can be applied to the specific fields such as weight reduction and sound and energy absorption.

The invention relates to the field of leather making, and discloses a preparation method of a high-strength anti-puncture synthesized leather bass by performing impregnation treatment on UHMWPE fiber three-dimensional compound nonwoven cloth through water-base resin. The preparation method comprises the following steps: preparation of the UHMWPE fiber three-dimensional compound nonwoven cloth, pre-impregnation, primary microwave drying, ironing, main impregnation, secondary microwave drying, washing, microwave drying for the third time and leather grinding, wherein the UHMWPE fiber three-dimensional compound nonwoven cloth is formed by weaving coarse denier UHMWPE fiber yarns, fine denier UHMWPE short fibers and water-soluble short fibers which serve as raw materials; in the main impregnation process, main impregnation liquid contains graphene-modified aqueous polyurethane resin. The synthesized leather bass disclosed by the invention is higher in strength, modulus, specific strength and specific modulus, high in weather resistance, high temperature resistance, chemical resistance and wear resistance, and extremely high in impact strength, can absorb shock impact and prevent noise, is low in friction coefficient, and is high in moisture permeability and breathability, green, environment-friendly, comfortable and low in cost.

A hard disk drive with a housing including a base member supporting a spindle motor rotating a data storage disk and an actuator having a read/write head, a cover member coupled to the base member to encompass the spindle motor and the actuator, a damping plate spaced a predetermined distance from an upper surface of the cover member to form an air gap between the damping plate and the cover member, a buffer member arranged between an edge portion of the cover member and an edge portion of the damping plate, and an air channel between the cover member and the damping plate to connect the air gap with the outside.

An easy assembling and disassembling type rattan bed is disclosed, comprising six support frame boards, a detachable bedstead, a bed board and a plurality of support legs. The six support frame boards, having rattan panels covered on all outer surfaces thereof, are successively and detachably connected to each other end to end, and the rattan panels are woven by a plurality of vertical rattans and a plurality of horizontal rattans. The six support frame boards are connected to each other end to end to form a bed frame, and the bedstead is arranged inside the bed frame and connected to inner sides of the bed frame. Detachable support bars, top surfaces of which and that of the bedstead both have EVA silencing pads attached thereon, are arranged on all inner sides of the support frame boards on the left and right sides.

A tire with a cellular layer is provided. The tire includes a tire structure formed of at least one crown extended by two sidewalls and two beads. A base of each of the two beads is configured to be mounted onto a rim seat. The tire also includes a carcass-type reinforcing structure anchored into the two beads, and a layer that includes a cellular material, also referred to as a cellular layer. The cellular layer is positioned on an inner wall of the tire structure, such that the cellular layer is bonded to the tire structure over at most over 20% of a surface of the cellular layer and is not bonded to the tire structure elsewhere on the surface.

An electronic device having a printed circuit board having a ground, an electrically insulating layer provided on a face of the printed circuit board, and an electromagnetic shielding layer adhered to the face of the printed circuit board through the electrically insulating layer. The ground of the printed circuit board and the electromagnetic shielding layer are conducted electrically.

The invention discloses a numerically controlled grooving device for furniture plate processing, which comprises a cabinet body. Two telescopic columns are symmetrically installed on the upper surface of the cabinet body through a mounting seat, and two sound-absorbing columns are symmetrically installed on both sides of the inner wall of the cabinet body. plate, the tops of the two telescopic columns are equipped with fixed seats, and a crossbeam is connected between the two fixed seats, the middle position of the crossbeam is installed with a headstock, and the bottom of the crossbeam is close to the two sides of the headstock There are two spray pipes symmetrically installed at the center. The present invention sets a spray device composed of an atomizer, a spray pipe and a spray nozzle to realize the dust-free slotting operation of the equipment, prevent the dust from distributing in the air and cause air pollution, and improve the working environment. The air quality is improved, and the sound-absorbing board is installed to absorb the noise generated by the electrical equipment inside the chassis in real time, avoiding noise pollution, ensuring the physical and mental health of the workers, and improving the work efficiency of the workers.

A semiconductor device, in which four pieces of strip-shaped electrodes, whose longitudinal directions are the same, are formed in each layer of a plurality of wiring layers that are provided by a same design rule with each other, simultaneously with regular wirings. In each wiring layer, two pieces each of first electrode and second electrode are formed parallelly with each other, alternately, and remote from each other. Then, the first electrodes formed in each layer are connected to each other by a first via, the second electrodes formed in each layer are connected to each other by a second via, a first structure body formed by connecting the first electrodes and the first via to each other is connected to a ground wiring, and a second structure body formed by connecting the second electrodes and the second via to each other is connected to a power source wiring.

The invention discloses a design method, structure and application of a perforated sound absorber inside a waste heat boiler. The perforated sound absorber comprises two perforated plates 1 and a liner plate 2. The two perforated plates 1 are attached to the two sides of the liner plate 2 respectively; the two sides, tightly attached to the perforated plates 1, of the linear plate 2 are respectively of a groove type structure, so that sound absorption cavities 3 are formed between the perforated plates 1 and the linear plate 2; liner pipes 4 are arranged in holes in the perforated plates 1. According to the perforated sound absorber inside the waste heat boiler, the perforated plates are provided with the liner pipes and the small holes, the problem that a traditional multi-hole sound absorber material is prone to blocking is effectively solved, the resonance absorber is formed by the sound absorption cavities formed by the perforated plates and the linear plate, noise produced inside the waste heat boiler can be effectively absorbed, and a part of the noise can be reflected to a noise source.

A wire harness includes one or a plurality of high voltage conduction paths, each having a high voltage conduction path main body, and a terminal which is provided at an end of the high voltage conduction path main body. The high voltage conduction path main body is formed into a cylindrical shape by spirally winding a metal wire rod and an insulating wire rod, and side end surfaces, which face each other, of the metal wire rod and the insulating wire rod positioned to be adjacent to each other alternately, contact each other.