48results about How to "Increase sound intensity" patented technology

Disclosed is an acoustic and electric combined stringed instrument of a violin group. The stringed instrument includes a soundboard including upper and lower panels arranged with an interval therebetween and a side panel surrounding the rims of the upper and lower panels, a neck part extending from the soundboard and provided at a distal end thereof with a head, one or more strings secured between the head and the soundboard, and a piezoelectric element to convert vibration and pressure of the strings into electric signals. The piezoelectric element is embedded in the lower panel and secured by a pressure plate, and a sound post is erected on the pressure plate above the piezoelectric element to transmit pressure and vibration from the strings to the pressure plate through a bridge and the upper panel, which enables generation of acoustic sound from the lower panel and amplified sound from the piezoelectric element.

A microelectromechanical system microphone structure including a substrate, a first device and at least one second device is provided. The first device is disposed on the substrate and including a first upper electrode and a first lower electrode disposed between the first upper electrode and the substrate. The second device is disposed on the substrate, surrounding the first device and including a second upper electrode and a second lower electrode disposed between the second upper electrode and the substrate. The second upper electrode includes a plurality of first conductive layers and first plugs. The first conductive layers are arranged in steps, and the first plug is disposed between the adjacent first conductive layers. The second lower electrode includes a plurality of second conductive layers and a plurality of second plugs. The second conductive layers are arranged in steps, and the second plug is disposed between the adjacent second conductive layers.

The invention relates to a method for preparing chitosan oligosaccharide by utlizing ultrasonic-hydraulic collaborative cavitation. The method is characterized by performing ultrasonic-hydraulic cavitation degrading treatment on a chitosan solution in an ultrasonic-hydraulic cavitation device by adopting ultrasonic-hydraulic collaborative cavitation degrading, wherein the ultrasonic-hydraulic cavitation device comprises a constant-temperature water bath circulating water tank, a storage tank, a pump, an ultrasonic-hydraulic cavitator, a pipeline for conveying the chitosan solution, a pressure gauge and a valve. The technological process comprises the following steps: putting the chitosan solution into the storage tank, stabilizing the temperature through the circulating water tank, conveying the chitosan solution to the ultrasonic-hydraulic cavitator through the pump for cavitation degrading, adjusting the inlet pressure through the valve, and monitoring the pressure through the pressure gauge, wherein the chitosan solution subjected to cavitation degrading flows back into the storage tank. Compared with the degrading rate of the existing hydraulic cavitation device (a Venturi tube) for preparing the chitosan oligosaccharide, the degrading rate of the method disclosed by the invention is improved by at least 70 percent; the method has the characteristics of simplicity, convenience, feasibility, low energy consumption, high efficiency and the like, and has the advantage of large-scale industrial application.

An electromechanical horn having a sound generating system including a piezoelectric speaker generates a series of short, audible sound signals in a repetitive pattern, the generated sound signals having fundamental frequencies with associated harmonic component frequencies and decibel levels that fall within a frequency range of greatest hearing sensitivity of the animal to disperse or deter an aggressive animal in a non-detrimental manner. The generated sound signals have fundamental frequencies with associated harmonic component frequencies that fall within a frequency range of from about 3 kHz to about 10 kHz, and decibel levels in a range of from about 75 dB to about 115 dB (SPL) at 1 meter. The horn device can be hand-held, attached to a user's belt or clothing, or removably attached to a bicycle, motorcycle, stroller, or other conveyance or object and can be actuated while attached or quickly removed and actuated when needed.

A method for cleaning pipeline features that a bowl-shaped cleaning part is driven by liquid stream to move in a pipeline, its edge can generate the liquid jet, and its vibration can squeeze the dirt and generate holes in fluid, so removing the dirt from the inner surface of pipeline. Its apparatus is composed of an axle with axle sleeve and the elastic sheets and elastic soft sheets, which are installed to said axle.

The invention belongs to the field of light alloy machining, and particularly relates to a variable frequency ultrasonic semi-continuous casting method for magnesium alloy. The method comprises the steps of alloy smelting, melt delivery and consolidation forming under ultrasonic treatment. Magnesium alloy melt is treated in a real-time variable frequency ultrasonic field introduced in the semi-continuous casting process, and the quasi real-time tracking of the resonant frequency of metal melt is achieved; and liquid cave melt is subjected to the ultrasonic resonance treatment continuously in the whole semi-continuous casting process, so that the continuous ultrasonic high-efficiency treatment of the magnesium alloy melt is achieved in the solidification process. In the method provided by the invention, an ultrasonic radiation rod is extended into the magnesium alloy melt in the magnesium alloy semi-continuous casting process, so that the cavitation effect and acoustic streaming effect produced by the variable frequency ultrasonic field directly act on the magnesium alloy melt solidifying. With the method provided by the invention, the magnesium alloy solidification behavior can be changed obviously, the structure is refined, and the uniformity of the billet solidification structure as well as the mechanical property of magnesium alloy billets are improved; and the billet casting defects are reduced obviously, and the quality of the magnesium alloy billets is improved greatly.

A loudspeaker suitable for the generation of surround-sound effects comprising a plurality of transducers that are together arranged to generate one or more beams of sound, at least one of which beams is steerable, wherein the transducers are arranged to reproduce sound only at frequencies higher than a selected lower frequency limit of 250 Hz or more. The loudspeaker may be foldable or dismantable so as to allow greater portability and may have means for interacting with an external electronics device, for example to allow low frequency sound signals to be reproduced by woofers in the external device.

A quasi-self focusing high intensity and large power ultrasonic transducer. It includes a backing and piezo-electric crystal sheets. The backing has double layer structure and there is an air cavity between the layers. At least four piezoelectric crystal sheets are adhered tightly on the inside focusing face of the backing. A protective layer is covered on the surface of the sheets.

The invention relates to the technical field of optical fiber sensing, in particular to a magnetic-adsorption-type oil well optical cable capable of being adsorbed on the inner side of a metal pipe wall of an oil and gas well. The problem that the degree of loss during the process that acoustic wave energy is transmitted from a bushing to an optical cable is increased due to the fact that the existing oil well optical cable is hung in the middle of the inner part of the bushing and cannot be tightly attached to the inner wall of the bushing is solved. The magnetic-adsorption-type oil well optical cable includes a coated optical fiber, a tight cladding layer is tightly attached to the outer surface of the coated optical fiber, a reinforcing layer is tightly attached to the outer surface ofthe tight cladding layer, adsorption parts capable of adsorbing a bushing are tightly attached to the outer surface of the reinforcing layer, and a protective layer is tightly attached to the outer surfaces of the adsorption parts. The adsorption parts can be tightly attached to the inner wall of the bushing, and external acoustic wave energy is directly applied to the optical cable after being transmitted to the bushing, the loss during the process of the acoustic wave energy being transmitted from the bushing to the optical cable is reduced, so that the response amplitude of the optical fiber to the external acoustic energy is improved, and the acoustic wave sensitivity of a distributed acoustic wave sensing cable is increased.

The invention relates to a Fe-Al-B magnetostrictive thin piece material and a preparation method thereof. The components (atom fraction) of the material meet the formula that Fe100-x-yAlxBy, wherein x is equal to 15-26, y is equal to 0.03-0.5, and the balance is Fe. The obtained Fe-Al-B magnetostrictive thin piece material has strong goss texture and has excellent magnetostrictive performance along the rolling direction.

The invention provides a Guzheng soundboard. The Guzheng soundboard as well as a Guzheng head board, a pored base board and a Guzheng tail board are all made of carbon fiber boards or carbon fiber and glass fiber composite boards. With respect to the Guzheng consisting of the Guzheng soundboard, the Guzheng head board, the pored base board and the Guzheng tail board which are all made of the carbon fiber boards or the carbon fiber and glass fiber composite boards, the characteristics of enhanced resonance, improved frequency response, durability, light weight and long service life of the Guzheng are achieved, the defects of cracking and deformation of a wooden material, influences of environment conditions and the like are avoided, and dual optimizations in structure and property are realized for the Guzheng instrument, thereby increasing the sound of the Guzheng, improving the tone of the Guzheng and prolonging the aftersound. For the Guzheng soundboard or the Guzheng consisting of the Guzheng soundboard, the Guzheng head board, the pored base board and the Guzheng tail board, which are made of the carbon fiber boards or the carbon fiber and glass fiber composite boards, a measurement is carried out within a range of 40-70db, and compared with a Guzheng made of a wooden soundboard, the Guzheng provided by the invention has sound intensity improved by 4.8-7.1% averagely.

The invention relates to a MEMS device, a preparation method thereof and an electronic device. The MEMS device comprises a substrate, a vibration diaphragm positioned above the substrate, a backplatepositioned above the vibration diaphragm and a cavity positioned between the vibration diaphragm and the backplate, thickness of the edge portion of the vibration diaphragm is greater than that of thecentral portion of the same, and the central portion and part of the edge portion are exposed in the cavity. The vibration diaphragm thickened at a vibration edge can make thickness of the vibrationdiaphragm at a weak point to reach two or more times of that of a vibration middle area, so that sound tolerant strength is improved, falling resistance and maximum sound threshold value of the deviceare improved, and reliability of the device is improved greatly.

The invention relates to an infrasonic wave generator base on laser-induced shock waves, which comprises a high-energy ultrashort pulse laser, a focusing system, a working medium-jetting system and a flaring tube. The high-energy ultrashort pulse laser interacts with the substance jetted by the working medium-jetting system, so that a working medium can be broken down to form plasma, the plasma explodes to generate a shock wave, the shock wave pushes the air in the flaring tube to move at extremely high speed along the axial direction of the flaring tube, the air of the orifice is excited by the shock wave, so that infrasonic waves with different frequencies can be generated, and the intensity of the infrasonic waves can be changed by changing the energy of the pulse laser or changing the working medium. The infrasonic wave generator has the characteristics of adjustable frequency and power, high maneuverability and the like. Since the infrasonic waves have extremely strong penetrating ability, the infrasonic waves can easily penetrate a building to cause a physiological effect on lives in the building, and by regulating frequency and power, the infrasonic wave generator can produce different physiological effects on lives.

The invention provides a display device which comprises a display panel, a back plate, a frame and an exciter, the exciter is located in the frame, and the exciter comprises a shell, a coil, a magnet, a magnetostrictive part and a vibration part; wherein the shell is connected with the frame or the back plate, the shell surrounds the coil, the coil is used for generating an alternating magnetic field according to a control signal, the coil is annular, the magnet and the magnetostriction piece are both located in the coil and are arranged in the axial direction of the coil, one end of the vibration piece is located in the shell, and the other end of the vibration piece extends out of the shell. The vibrating piece, the magnet and the magnetostrictive piece are tightly pressed between the frame and the shell; and the magnetostriction piece can generate telescopic deformation along the axial direction of the coil in a superposed magnetic field of the alternating magnetic field and the magnetic field generated by the magnet, and drives the frame to vibrate and produce sound. The display device provided by the invention is small in thickness and conforms to the ultrathin development trend of the display device.

The invention discloses a piezoelectric automobile loudspeaker. The interior of a vocal cavity of a housing is provided with a sound generating unit, and the housing above the sound generating unit isprovided with a protection cover in a matched manner. The sound generating unit is formed by multiple piezoelectric ceramic pieces pasted on the upper surface of a conductive vibrating diaphragm. Thestructure of multiple piezoelectric ceramic pieces is formed by the alternate stacking of big electrode layers and piezoelectric ceramic layers, wherein the upper and lower surfaces of the piezoelectric ceramic pieces are big electrode layers. The piezoelectric ceramic layers are provided with metalized microholes, and the interiors of the metalized microholes are provided with small electrodes which enable the big electrode layers located at upper and lower sides of the piezoelectric ceramic layers to be connected. The piezoelectric ceramic layers are connected with first lead wires, and thevibrating diaphragm is connected with a second wire.

The invention relates a bass sound box, and specifically relates to a dual-box subwoofer and a television set internally provided with the same. A small box of the subwoofer is disposed inside a large box of the subwoofer. The small box and the large box are cylinder-shaped, and the end surfaces of the small box and the large box are polygon-shaped. At least one end surface of the small box is coplanar with at least one end surface of the large box, and the coplanar end surface of the large box and the small box is provided with a second sound port. A second sound guiding tube is disposed inside the small box, wherein the second sound guiding tube is communicated with the ambient atmosphere through the second sound port, and sound wave airflow is transmitted between the small box and the ambient atmosphere through the second sound guiding tube. The large box is provided with a first sound port, and a first sound guiding tube is disposed inside the large box, wherein the first sound guiding tube is communicated with the ambient atmosphere through the first sound port, and the sound wave airflow is transmitted between the large box and the ambient atmosphere through the first sound guiding tube. The first sound port is arranged in the end surface at the other end of the large box, or in the side surface provided with any edge of the polygon, or is coplanar with the second sound port. Loudspeaker units are mounted on the small box. The dual-box subwoofer is advantaged by good bass effects, small size and non-distortion.

The invention discloses a wind-driven bird repelling device, and relates to the technical field of wind power driving. The wind-driven bird repelling device comprises a hexagonal base, wherein a positioning column is movably connected to the middle position of the top of the hexagonal base, a reinforcing seat plate is fixedly connected to the position, corresponding to the hexagonal base, of the outer surface of the positioning column, and a sound wave mechanism is fixedly connected to the end, away from the hexagonal base, of the positioning column; the outer surface of the end, away from the positioning column, of the sound wave mechanism is movably connected with a rotating ring, the outer surface of the rotating ring is movably connected with a wind-driven spherical cover, the bottom of the rotating ring is movably connected with the sound wave mechanism, the bottom of the outer surface of the wind-driven spherical cover is movably connected with the sound wave mechanism, and the bottom of the sound wave mechanism is movably connected with the reinforcing seat plate. The wind-driven bird repelling device is triggered through magnetic force, intermittent self-control is facilitated, adaptability of birds to sound waves is reduced, the dispersing effect of the birds is improved, meanwhile, the surface of the device is smooth, point effect cannot be generated, and self-protection capacity is enhanced.