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32results about How to "Reduce acoustic noise" patented technology
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Motor drive control
ActiveUS7015664B2Reduce acoustic noiseReduce noiseMotor/generator/converter stoppersSynchronous motors startersMotor driveThree-phase
A drive system for a three phase brushless motor uses an algorithm for position sensing which measures the inductance in the motor phases and determines the position from the measured inductances. In order to reduce acoustic noise, the inductances are measured during test periods Tsd, which are conducting states added to the PWM pattern in each PWM period. The test periods have net voltage of zero and therefore do not affect the output of the motor, but are sufficiently long to allow inductance measuring as well as the use of a single current sensor for current sensing.
Owner:TRW LIMITED
System and Method for Portable Information Handling System Parallel-Wall Thermal Shield
ActiveUS20090323275A1Reduce disadvantagesReduce problemsEnergy efficient ICTDigital data processing detailsThermal energyEngineering
An information handling system's thermal management is selectively altered by coupling a thermal barrier to the bottom surface of the information handling system chassis so that an air channel insulates against the passage of thermal energy from the bottom surface. A vent opening in a side of the thermal barrier allows airflow through the air channel to a vent opening of the information handling system. The airflow through the air channel cools the base of the thermal barrier so that an end user will experience reduced thermal energy if the information handling system rests on the end user, such as in the end user's lap.
Owner:DELL PROD LP
Pressure support system with active noise cancellation
InactiveUS7448382B1Reduce acoustic noiseIncrease magnitudeRespiratorsOperating means/releasing devices for valvesTraffic volumeLoudspeaker
A medical device, such as a respiratory treatment device, having an active acoustic noise cancellation system. In one embodiment, the noise minimizing system includes at least one detector detecting characteristics of acoustic noise of a blower assembly and at least one speaker creating a cancellation frequency in the form of acoustic waves that at least partially cancels acoustic waves generated by the blower assembly. In another embodiment, the noise minimizing system includes a mechanical vibration generating element that creates a cancellation frequency in the form of a mechanical vibration that at least partially cancels vibrations of the blower assembly. This is accomplished, for example, by dithering a flow control valve at a frequency corresponding to an operating frequency of the blower assembly. Each embodiment can be used alone or in combination.
Owner:RIC INVESTMENTS LLC
High compression ratio, high power density homogeneous charge compression ignition engines using hydrogen and carbon monoxide to enhance auto-ignition resistance
ActiveUS7290522B2Slow down combustion processReduce acoustic noiseElectrical controlInternal combustion piston enginesHigh power densityAutomotive engineering
High compression ratio, homogeneous charge compression ignition engines. In one aspect the engine is dual mode utilizing spark ignition at high load levels including the addition of hydrogen or a hydrogen / carbon monoxide mixture. In another aspect, the engine operates on a high cetane fuel with the addition of hydrogen or a hydrogen / carbon monoxide mixture at low-to-mid-load levels.
Owner:MASSACHUSETTS INST OF TECH
Multiple chambers mask
InactiveUS20110011397A1Reduce acoustic noiseLess noisyRespiratory masksMedical devicesCushionEngineering
The present invention provides methods and apparatuses for gas delivery, in particular, a mask including at least one porous barrier defining at least two chambers in gaseous communication. The porous barrier may include a plurality of pores, which define a tapered shape. The mask may include a pliable nasal cushion. The invention provides a method for providing pressurised gas to a subject by supplying gas from a pressurised source to a mask, transmitting the gas into a first chamber at a first pressure, transmitting the gas into a second chamber at a second pressure through a plurality of pores, and transmitting the gas from the second chamber through a mask exit.
Owner:COMPUMEDICS MEDICAL INNOVATION
Multilayer ceramic electronic part, board having the same mounted thereon, and manufacturing method thereof
InactiveCN104347270AReduce acoustic noiseFixed capacitor dielectricStacked capacitorsInsulation layerActive layer
A multilayer ceramic electronic part may include: a ceramic body; an active layer including a plurality of first and second internal electrodes disposed to be alternately exposed to both end surfaces of the ceramic body, having the dielectric layer therebetween; an upper cover layer formed on an upper portion of the active layer; a lower cover layer formed on a lower portion of the active layer and having a thickness thicker than that of the upper cover layer; and first and second external electrodes electrically connected to the first and second internal electrodes, wherein the first and second external electrodes include: first and second conductive layers extended from both end surfaces of the ceramic body onto upper and lower main surfaces thereof; and first and second insulation layers formed on the first and second conductive layers disposed on both end surfaces of the ceramic body.
Owner:SAMSUNG ELECTRO MECHANICS CO LTD
Chip type laminated capacitor
ActiveUS20120327557A1Reduce acoustic noiseReduce thicknessFixed capacitor electrodesFixed capacitor dielectricMaterials scienceDielectric layer
There is provided a chip type laminated capacitor including: a ceramic body formed by laminating a dielectric layer having a thickness equal to 10 or more times an average particle diameter of a grain included therein and being 3 μm or less; first and second outer electrodes; a first inner electrode having one end forming a first margin together with one end surface of the ceramic body at which the second outer electrode is formed and the other end leading to the first outer electrode; and a second inner electrode having one end forming a second margin together with the other end surface of the ceramic body at which the first outer electrode is formed and the other end leading to the second outer electrode, wherein the first and second margins have different widths under a condition that they are 200 μm or less.
Owner:SAMSUNG ELECTRO MECHANICS CO LTD
Multilayer ceramic electronic component and board having the same mounted thereon
ActiveCN104637679AReduce acoustic noiseFixed capacitor electrodesStacked capacitorsInterposerCeramic capacitor
A multilayer ceramic electronic component may include: a multilayer ceramic capacitor including a ceramic body in which a plurality of dielectric layers are stacked, a pair of first external electrodes and a pair of second external electrodes formed on both side surfaces of the ceramic body and extended to portions of a mounting surface of the ceramic body, and first and second internal electrodes alternately stacked, having the dielectric layer therebetween, exposed through at least one side surface of the ceramic body, and connected to the first and second external electrodes, respectively; and an interposer substrate including an insulation substrate bonded to the mounting surface of the multilayer ceramic capacitor, and first and second connection terminals formed on the insulation substrate and connected to the first and second external electrodes, respectively.
Owner:SAMSUNG ELECTRO MECHANICS CO LTD
Noise management for optical time delay interferometry
ActiveUS20160187223A1Reduce acoustic noiseReduce the noise floorReflectometers using simulated back-scatterSubsonic/sonic/ultrasonic wave measurementVibration attenuationTime delays
An integrated fiber interferometry interrogator for generating superimposed waves is disclosed. The system is optimized for efficiency and vibration attenuation. The system comprises an optical light source for generating a first signal, a first signal splitter which splits the first signal into a reference signal and an interrogation signal, optical modulators for modulating the signals, a fiber coupler connected to a fiber under test, an isolator, a circulator with a plurality of connections for directing the signals, a signal mixer for mixing the signals into superimposed waves, and photo diodes for receiving the superimposed waves.
Owner:ADELOS LLC
Control circuit and control method of switch power supply, light-emitting device and electronic device
ActiveCN102237794AReduce acoustic noiseStatic indicating devicesElectroluminescent light sourcesVoltage referenceControl circuit
Owner:ROHM CO LTD
Brushless motor and disk drive apparatus
InactiveUS6958877B2Stable secure rotational driveReduce acoustic noiseMotor/generator/converter stoppersAC motor controlBrushless motorsLocation detection
A brushless motor has first and second power transistors which form current paths to three-phase windings so as to rotate a rotor. A position detecting part produces a position signal in response to a rotation of the rotor. An activation operation block controls active operation of the first and second power transistors in response to the position signal. The activation operation block includes a starting operation part which comprises an initial phase setting part, phase changing part and a phase correcting part. The initial phase setting part sets an initial phase of drive signals to the three-phase windings in response to the level of the position signal at the timing of a start signal. The phase changing part changes sequentially the phase of the drive signals to the three-phase windings in the positive direction in response to time. The phase correcting part corrects the phase of the drive signals to the three-phase windings in response to the occurrence of the rising and falling edges of the position signal. Therefore, the brushless motor with reduced position sensor can stably start the rotation of the rotor by using one position signal of one position sensor.
Owner:PANASONIC CORP
Computer systems
InactiveUS20050060440A1Reduce acoustic noiseSave powerEnergy efficient ICTDigital data processing detailsEngineering
The present invention relates to computer systems. An embodiment provides an arrangement for a computer system; the arrangement comprising at least one terminal to provide dynamic information relating to an operating characteristic of the arrangement; and circuitry, using the at least one terminal, to produce an output signal bearing the dynamic information associated with the operating characteristic of the arrangement.
Owner:HEWLETT PACKARD DEV CO LP
Luminous switch and electronic device provided with the same
ActiveUS20090200146A1Reduce acoustic noiseReduce noiseEmergency actuatorsContact surface shape/structureEngineeringElectrical conductor
A luminous switch using an inorganic EL material is provided with a plurality of switch sections so as to reduce acoustic noise. The switch sections are provided with a plurality of protruding parts (112) and a plurality of supporting sections (113) formed on a surface of a structure (101); an elastic deformable conductor (124) arranged to have a convex surface opposed the protruding parts (112); a wiring sheet (102A) for covering the conductor (124); a luminous sheet (160) for covering the wiring sheet (102A); and a plurality of switch buttons (125) arranged above the luminous sheet (160). The luminous switch has a structure in which at least two supporting sections (113) are arranged around the protruding parts (112), and a space (111) is formed between the protruding parts (112) and a switch sheet (102). The conductor (124) is accommodated in the space (111). In a case main body (101), an electronic component (103) is mounted and a substrate (104) provided with wiring is arranged. The switch buttons (125) are fixed on a key sheet (129). A top plate (106) is arranged on the key sheet (129) by surrounding the switch buttons (125). The top plate (106) is arranged to cover lower components.
Owner:NEC CORP
Capping device of conduit mouth of ship body
InactiveCN102381439AImprove working conditionsThe overall structure is simple and reliableWaterborne vesselsPower-operated mechanismCap deviceOperational maintenance
The invention relates to a capping device of a conduit mouth of a ship body, which comprises a cylinder body 1, cover plates 2 and a cover plate driving device 3, wherein the 2-6 cover plates 2 which can realize 90-degree rotation are symmetrically distributed on the vertical circular section close to a cylinder mouth of the cylinder body 1 as far as possible, in the cylinder body 1, along the central line of the circular section, the rotation axial lines of the cover plates 2 are parallel to the central line of the circular section, and all the cover plates can just seal the vertical circular section of the cylinder body when the cover plates are closed; a driving rotating shaft 4 and a driven rotating shaft 5 are connected at the two ends of each cover plate 2, the driving rotating shafts 4 and the driven rotating shafts 5 are respectively fixed on the cylinder body 1 through bearing seats 6, the axial lines are superimposed, and the driving rotating shafts and the driven rotating shafts can rotate along the axial lines respectively; and the cover plate driving device 3 is fixed on the cylinder body 1 and can drive the driving rotating shafts to drive the cover plates 2 to realize the 90-degree rotation. The capping device can reduce acoustic noise generated by the open conduit mouth and improve the working conditions of a ship-borne acoustic detection system; and the structure is simple and reliable, the conventional relay control can be adopted, the operation and the maintenance are convenient, and the cost is low.
Owner:HUNAN UNIV OF SCI & TECH
System and method for adaptive information handling system cooling profiles
ActiveCN1967445AReduce acoustic noiseDigital data processing detailsElectrical apparatus contructional detailsEngineeringHandling system
An information handling system cooling profile is adjusted as the hardware configuration of the information handling system changes with the addition or removal of processing components. A cooling profile engine adapts the cooling profile to adjust for a processing components thermal profile, such as by retrieving the thermal profile from the component and applying the thermal profile to a cooling profile table to retrieve a cooling profile associated with a configuration having the component. In one embodiment, cooling profile adjustments are managed through a network so that the adjusted cooling profile adapts to other information handling systems operating nearby, such as blade information handling systems of a blade server.
Owner:DELL PROD LP
Capping device of conduit mouth of ship body
InactiveCN102381439BImprove working conditionsThe overall structure is simple and reliableWaterborne vesselsPower-operated mechanismEngineeringCap device
Owner:HUNAN UNIV OF SCI & TECH
Acoustic noise reduction in a dc-dc converter using variable frequency modulation
PendingCN110380611AIncrease the switching frequencyReduce voltage differenceDc-dc conversionElectric variable regulationAcoustic noise reductionDc dc converter
The present embodiments relate generally to switched-capacitor (SC) based DC-DC converters, and more particularly to modulation schemes of cap dividers that include ceramic capacitors such as MLCCs. According to certain general aspects, the present embodiments increase the switching frequency at light loads using variable frequency modulation schemes to reduce the voltage difference across the MLCCs. In these and other embodiments, the acoustic noise generated from the MLCCs can be reduced while maintaining excellent light load efficiency. According to certain aspects, this can be achieved with minimal impact on system performance, cost and size.
Owner:RENESAS ELECTRONICS AMERICA
Multi-layer ceramic electronic assembly and board provided thereon with multi-layer ceramic electronic assembly
ActiveCN104810153AReduce acoustic noiseFixed capacitor electrodesFixed capacitor dielectricMetallurgyCeramic capacitor
The present invention relates to a multi-layer ceramic electronic assembly and a board provided thereon with the multi-layer ceramic electronic assembly. The multi-layer ceramic electronic assembly comprises a multi-layer ceramic capacitor composed of a first ceramic body, a plurality of first inner electrodes, a plurality of second inner electrodes, a plurality of first outer electrodes and a plurality of second outer electrodes; and a ceramic chip composed of a first ceramic body, a third inner electrode, a fourth inner electrode, a first connecting terminal, a second connecting terminal, a first outer terminal and a second outer terminal. The second ceramic body is formed through stacking up a plurality of ceramic layers on the mounting surface of a multi-layer ceramic capacitor. The first and second connecting terminals are respectively extending to some parts of the upper surface of the ceramic body from the lateral surface of the second ceramic body respectively, and are respectively connected to the first and second outer electrodes of the multi-layer ceramic capacitor. The first and second outer terminals are respectively arranged on the end of the ceramic body, and are respectively connected to the exposed portions of the third and fourth inner electrodes respectively.
Owner:SAMSUNG ELECTRO MECHANICS CO LTD
Backlight driving circuit
InactiveCN101587682AReduce acoustic noiseReduce vibrationStatic indicating devicesCapacitanceControl signal
The invention relates to a backlight driving circuit which comprises a switch assembly, a load comprising a filter capacitor and a light source connected in parallel, a controller, a direct-current boost module and a voltage signal processor. The controller generates and outputs a control signal, and the direct-current boost module receives the control signal and correspondingly outputs a voltage signal to drive the load through the switch assembly. The voltage signal processor detects the voltage signal outputted by the direct-current boost module, and when the ripple of the voltage signal is smaller than a certain default, the switch assembly is conducted; when the ripple of the voltage signal is greater than the certain default, the switch assembly is disconnected, and the voltage signal is converted into a voltage signal with smaller ripples to drive the load.
Owner:INNOCOM TECH SHENZHEN +1
Composite electronic component and board having the same
ActiveUS20190157005A1Reduce acoustic noiseLower ESLAnti-noise capacitorsFixed capacitor electrodesCeramic capacitorElectronic component
A composite electronic component includes a composite body including: a multilayer ceramic capacitor including a first ceramic body including a plurality of dielectric layers and first and second internal electrodes disposed to face each other with respective dielectric layers interposed therebetween and stacked to be perpendicular to a lower surface of the first ceramic body, and a ceramic chip being coupled to the multilayer ceramic capacitor and disposed on a lower portion of the multilayer ceramic capacitor, the ceramic chip including a second ceramic body, first and second terminal electrodes disposed on upper and lower portions of the second ceramic body and connected to the first and second external electrodes, respectively.
Owner:SAMSUNG ELECTRO MECHANICS CO LTD
Multilayer capacitor
ActiveUS20190279824A1Reduce acoustic noiseReduce noiseAnti-noise capacitorsFixed capacitor electrodesElectrical and Electronics engineeringCapacitor
A multilayer capacitor in which acoustic noise is reduced has an area of overlap between internal electrodes in an active region of a lower portion of a capacitor body that is smaller than an area of overlap between internal electrodes in an active region of an upper portion of the capacitor body. The multilayer capacitor can be bonded to a board by relatively small solders such that the lower portion is adjacent the board. Deviations between areas of overlap of adjacent internal electrodes in the upper and lower portions of the active region are minimized to reduce piezoelectric deformation of the capacitor body.
Owner:SAMSUNG ELECTRO MECHANICS CO LTD
Ventilation damper system and method
ActiveCN105917175AAvoid flowReduce vibrationLighting and heating apparatusAir-flow control membersEngineeringMechanical engineering
A damper assembly is disclosed and includes a main body defining a continuous fluid path extending between a first opening and a second opening, and a damper door rotatable within the main body to control the flow of fluid through the main body. The main body includes an engagement edge extending circumferentially on an inner surface of the main body. The damper door can be rotated relative to the main body to sealingly engage an outer edge of the damper door with the engagement edge. The engagement edge of the main body can be oriented on the inner surface such that the surface area of the outer edge such that engagement of the engagement edge gradually increases as the damper door is rotated to seal the damper door to the main body.
Owner:BROAN NUTONE
Line sorter
ActiveCN107771156AReduced acoustic noise levelsReduced energy input requirementsNon-mechanical conveyorsConveyor partsSynchronous motorCoupling
The invention relates to a line sorter for sorting items of various shapes, sizes and weights, in particular postal parcels or airport baggage. The invention is particularly related to the propulsionsystem (304, 306, 406) for the sorter. It may be seen as an object of the invention to provide a line sorter with a reduced need for energy input at a given sorting capacity. It is disclosed that a closed loop chain including sorting carts or slats (302) is provided with couplings (312) and is provided for moving along line sorter track sections. The linear synchronous motor propulsion system is provided for moving said closed loop chain, and a gap between adjacent permanent magnets (306) is the same or substantially the same between each of the permanent magnets.
Owner:BEUMER GRP AS
Ventilation damper system and method
InactiveCN105917175BAvoid flowReduce vibrationLighting and heating apparatusAir-flow control membersClassical mechanicsEngineering
A damper assembly comprising: a body defining a continuous fluid path extending between a first opening and a second opening; and a damper rotatable within the body to control fluid flow through the subject. The body includes an engagement edge extending circumferentially over the inner surface of the body. The damper is rotatable relative to the body to sealingly engage the outer edge of the damper with the engagement edge. The engagement edge of the body can be oriented on the inner surface such that the surface area of the outer edge engaging the engagement edge increases progressively as the damper is rotated to seal the damper to the body.
Owner:BROAN NUTONE
Method for controlling an electrical machine of a hybrid powertrain on the basis of the set value selected by the driver
ActiveCN109153324AHigh torqueLoud noiseHybrid vehiclesGas pressure propulsion mountingPower batteryLower limit
The invention relates to a method for controlling an electrical machine (13) of a hybrid powertrain (1) for recharging an electrical power battery (17) of an electric traction. The control method is configured such that the electrical machine (13) takes up a drawing torque from the heat engine (11), which torque has an upper limit, and from which the set value selected by the driver to respect anacoustic stress level is derived. According to the invention, when the set value selected by the driver is higher than a torque threshold, the method limits the drawing torque to a lower limit to ensure that the battery (17) of the electric traction is recharged.
Owner:PEZHO SITROEN AUTOMOBILS SA
Circuit arrangement and method for regulating current through at least one discharge lamp
InactiveCN101926231AEasy to adjustAvoid oscillationElectrical apparatusElectric lighting sourcesGas-discharge lampInterconnection
The present invention relates to a circuit arrangement for regulating the current through at least one discharge lamp having a control loop (10) comprising: a target value input for supplying a target value (UTarget); an actual value input for supplying an actual value (UActual); and an output for providing a signal, which is correlated to the current (IL) through the at least one discharge lamp (La), wherein said actual value (UActual) is correlated with the value of the current through said discharge lamp (La); and a target value preset device (18, 20), which is designed to provide the target value (UTarget) to the control loop (10); wherein said target value preset device comprises: a microprocessor (20) having at least one input (E5; E6; E7; E8), wherein said microprocessor (20) is designed to couple said at least one input (E5; E6; E7; E8) to a potential (VCC; Open; Analog; GND) from a group of at least two different potentials (VCC; Open; Analog; GND); and an interconnection device (18) having at least one input (E1; E2; E3; E4), which is coupled to the at least one input (E5; E6; E7; E8) of the microprocessor (20), and at least one output, which is coupled to at least one point of the control loop (10). In addition, the present invention relates to a corresponding method for regulating the current (IL) through at least one discharge lamp (La).
Owner:OSRAM GMBH
Method of controlling an electric motor of a hybrid powertrain according to a driver's setpoint
ActiveCN109153324BReduce acoustic noiseHigh torqueHybrid vehiclesGas pressure propulsion mountingBattery chargeDriver/operator
Owner:PEZHO SITROEN AUTOMOBILS SA
Magnet system for a magnetic resonance imaging system
PendingCN113534029ALow Faraday forceReduce acoustic noiseDiagnostic recording/measuringSensorsMR - Magnetic resonanceAtomic physics
The invention describes a magnet system for a magnetic resonance imaging system (1) comprising a basic field magnet (4) and a gradient system (6), wherein coils of the gradient system (6) are positioned outside the area of a predefined basic magnetic field (B0) of the basic field magnet (4). The invention further describes an according gradient system and a magnetic resonance imaging system with such magnet system.
Owner:SIEMENS HEALTHCARE GMBH
Intelligent navigation riding glasses
InactiveCN106019633AQuick responsePrecise vibration controlNon-optical adjunctsIntelligent lightingVibration control
The invention discloses intelligent navigation riding glasses which comprise a glasses frame and further comprises a piezoelectric driving module, a Bluetooth communication module, a power supply module and a switch device. Any one or more of the front end of the glasses frame and the two sides of glasses legs are provided with piezoelectric vibration modules; the piezoelectric vibration modules, the piezoelectric driving module, the Bluetooth communication module, the power supply module and the switch device are detachably installed on the glasses frame to be packaged together. According to the glasses, the piezoelectric vibration modules are adopted as high-precision tactile feedback actuators, the response speed is higher, vibration control is more precise, the wider driving voltage frequency can be accepted, and acoustic noise is lower; tactile sense is used as an information transmission channel, and therefore a visual sensor information transmission channel and an auditory sense information transmission channel are omitted; intelligent mobile equipment GPs navigation system software and a complicated computing processing function thereof are utilized.
Owner:YANSHAN UNIV
Linear compressor, housing of linear compressor, and manufacturing method of the housing
ActiveCN105317660BReduced Manufacturing ComponentsReduce noisePositive displacement pump componentsPiston pumpsNoise generationResonant cavity
According to the casing of the linear compressor of the present invention, a cylinder, a piston and a motor assembly are housed in the casing, wherein the piston reciprocates inside the cylinder, and the motor assembly is directly fastened to the The piston is used to provide a driving force to the piston; the housing is formed in a cylindrical shape; the housing is composed of a multi-layer plate formed by stacking at least two plates in the radial direction; A resonant cavity is formed on the inner surface. According to the present invention, it is also possible to reduce the amount of noise generated by a linear compressor operating at high speed, so that high-end products can be produced. Through the present invention, not only the vibration noise can be reduced, but also the sound noise can be reduced, so that the discomfort felt by consumers in various aspects can be improved. Through the present invention, the noise reduction structure of the linear compressor can be realized at low cost.
Owner:LG ELECTRONICS INC
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