106results about How to "Reduce noise sources" patented technology

A apparatus for detecting electrooculograph (EOG) signals, comprising: a pair of temple pieces connected to a bridging structure; at least one electrode on each temple piece configured to contact the skin at the temple, and to receive an EOG signal from a proximate orbital socket; a reference electrode displaced from each temple; and a processor configured to process signals from the sensors to detect saccade movements of the eyes. A wavelet-based algorithm permits analysis and coding of the saccade movements.

The invention discloses a passive noise shaping successive approximation SAR analog-to-digital converter. The analog-to-digital converter comprises three capacitive digital-to-analog converters (CDACs), a passive loop filter, a comparator and an SAR logic circuit, wherein the three identical CDACs comprise a CDAC1 required by normal SAR conversion and two auxiliary CDAC2 and CDAC3 used for generating a margin voltage of a previous period. Two interlaced CDAC2 and CDAC3 are added, and KT/C noise and gain loss introduced by passive margin sampling are removed. Wherein the CDAC1 generates the margin voltage Vres (n) of the current period, and the CDAC2 and the CDAC3 alternately generate the margin voltage Vres (n-1) of the previous period. And the passive loop filter carries out noise shapingon the margin voltage and suppresses in-band noise of the signal. And the comparator quantizes the analog output of the passive loop filter into a digital code, the digital code toggles the next capacitor switch in the CDAC through the SAR logic circuit until the conversion is finished, and all the digital codes are sequentially spliced together to serve as the output code of the SAR ADC, which is the same as that of the common SAR ADC. According to the invention, the second-order noise shaping effect can be realized, the signal in-band quantization noise and the comparator noise are effectively suppressed, and the signal-to-noise ratio and the spurious-free dynamic range of the SAR ADC are obviously improved.

The invention relates to a novel pipeless steel wire rope stranding machine which comprises a rack (1), a main motor (2) and an overtwist (14), and is characterized in that the two sides of the rack (1) are respectively fixed with a bearing seat (4); the bearing seats at the two sides of the rack (1) are respectively provided with a hollow rotating shaft (5); the inner ends of the rotating shafts are connected with rotating arms (7); the rotating arms are connected through a bow belt; a paying off base plate (9) is vertically arranged between the rotating arms; the two faces of the paying off base plate (9) are respectively fixed with a plurality of paying off units (11) which are vertical to the paying off base plate; the paying off base plate is also provided with a wire collecting device which is composed of a wire collecting plate I (12) and a wire collecting plate II (13). With the adoption of the novel pipeless steel wire rope stranding machine, the production efficiency is greatly improved; and meanwhile, noise sources can be abolished, and the factory environment is purified.

The present invention relates to a cyclone separation device for separating particles from air and a cyclone vacuum cleaner (80). It has the objective to reduce noise without impairing the dirt separation performance. This is achieved an arrangement comprising a cyclone chamber (10), a dirt collecting chamber (50) arranged adjacent to the cyclone chamber (10) for collecting dirt particles separated from air, a dirt-duct (40) between the cyclone chamber (10) and the dirt collecting chamber (50) for allowing dirt particles to pass from the cyclone chamber (10) towards the dirt collecting chamber (50), and an air- guide (60) arranged adjacent to the dirt-duct (40) for reducing the momentum of the air in the dirt-duct (40).

The invention relates to a dual-motor hybrid power coupler, which is provided with a brake B0 on an engine input shaft, a planet carrier connected with a planetary transmission gear set on the engineinput shaft, a sun gear and a large gear of the planetary transmission gear set are coaxially fixed and empty sleeved on the engine input shaft, and a gear ring of the planetary transmission gear setis connected with an output shaft; a brake B1 is arranged on an input shaft of the first motor, the input shaft of the first motor is connected with an idler gear through an idler gear, and the idlergear is meshed with a large gear of a planetary transmission gear set; a clutch is arranged between the primary driving gear and the input shaft of the second electric machine, the primary passive gear is coaxial with the secondary driving gear, and the secondary passive gear is identically sleeved on the input shaft of the engine and fixedly connected with the ring gear of the planetary transmission gear set. The invention has the advantages of compact structure and novel form, can realize deep hybrid power, and ensures that the engine and the electric motor always work in the optimal efficiency region through switching between a plurality of driving modes.

The invention discloses a high polymer composite for an embedded rail system, which comprises the following components by weight percentage: 100% of base material, a filling material, 2-25% of damping liquid, 0-15% of curing agent, an appropriate amount of defoaming agent, an appropriate amount of colorant and an appropriate amount of plasticizer, wherein the base material is polyurethane modified epoxy resin; the filling material comprises the following components by weight percentage: 20-100% of rubber particle, 5-200% of cork powder, 5-100% of slag, 5-60% of expanded perlite and 5-45% of cement expanded perlite. The high polymer composite can meet three-way rigidity requirements of the rail system, has good damping capacity and fatigue resistance, does not crack after three million fatigue tests, is excellent in electrical insulation, green and environment-friendly, and can be recycled and smashed as filling for repeated use.

In a phase locked loop in which a phase detector compares an input signal to a reference signal and provides a difference signal to a charge pump or to a transconductance amplifier, a digital to analog converter is provided for connecting the output of the charge pump or transconductance amplifier to a voltage controlled oscillator whereby loop bandwidth can be increased from an operating value to an acquisition value for loop phase acquisition by changing the input to the DAC, thereby changing the amplification of the DAC.

The invention discloses a novel energy-saving low noise diesel generator set. The diesel engine power is between 30kw and 130kw and the corresponding generator power is between 20kw and 100kw, the diesel engine is a supercharged intercooled diesel engine of which the rated rotary speed is 1000r/min and the fuel consumption is 205-210g/kw.h, thus obviously saving energy; the exhaust pipe adopts a divided exhaust pipe, 20mm space is reserved between the height of the baffle and the flange plane of the supercharger arranged on the exhaust manifold, thus effectively avoiding the influences on the supercharger efficiency due to excessively high temperature caused by the crossed exhaust gas of the engine; a silenced case body is added to the engine set, a high-performance shock absorber is adopted, an efficient PUR (poly urethane resin) type antiflaming sound absorbing sheet is pasted in the case body and a labyrinth type inlet air mulffer device made from a high-efficiency damping material is adopted to reduce the source of noises. Experimental results show that the energy-saving low noise diesel generator set can operate reliably for a long time with a controllable noise value of 65-70dB(A) at one meter).

A motor driving assembly includes a single phase motor and a torque transmission mechanism. The torque transmission mechanism includes a driving member being driven by the motor, a driven member for driving a load to rotate along a predetermined direction, and a connecting device comprising a resilient member and a damping member. The resilient member includes one end connected to the driving member and the other end connected to the driven member. The damping member is coated on or attached over the resilient member, or filled in a gap of the resilient member, or the resilient member is made from a damping material in order to reduce noise produced by the resilient member.

The invention provides an environmentally-friendly transport vehicle for fresh and live aquatic products. The environmentally-friendly transport vehicle comprises a carriage, a solar cooling system isarranged on the carriage, the carriage is internally provided with keep-alive boxes with a water cycle device, and a solar power system used for power supply is provided; the water cycle device comprises a water pump, a water inlet of the water pump is communicated with the keep-alive boxes, a water outlet of the water pump is connected with a filtering and sterilization box, the filtering and sterilization box is connected with a cool-heat-exchanger through a foam separation device, the cool-heat-exchanger is communicated with the keep-alive boxes, and the water pump is connected with a controller. According to an inner-box environment monitoring system of the transport vehicle, optical fiber sensors are applied to measurement of oxygen, the temperatures and ammonia-nitrogen in water inan aquatic product transporting process, so that the transport environments of the aquatic products are accurately monitored in real time; according to the transport vehicle, the multiple keep-alive boxes are independently controlled, and the appropriate environments are provided for each kind of aquatic products, so that the transporting keep-alive rate of the fresh and live aquatic products is effectively improved.

The invention discloses a low-temperature casting material for extremely cold areas. The low-temperature casting material comprises a component A and a component B, wherein the weight ratio of the component A to the component B is (80-150):100, the weight ratio of oligomer polyol, isocyanate, a viscosity reducer and a plasticizer in the component A is 100:(24-42):(5-20):(8-16), and the weight ratio of a chain extender, a filling agent, a catalyst, a flame retardant, an anti-oxidant, a photostabilizer and a coloring agent in the component B is (10-2):(20-80):(6-12):(6-15):(1-3):(0.5-2):(0.5-1). The low-temperature casting material has the benefits that the glass transition temperature is low, the temperature influence is eliminated when construction is carried out in extremely cold areas at -40 DEG C or above, and the high elasticity of the material can be kept after complete curing; the vibration reduction effect and the noise reduction effect are excellent, and isotropic stiffness, damping properties and physical properties which can meet requirements are provided; the material is environment-friendly, is unlikely to burn, and is safe and reliable.

The invention discloses a high-speed drilling machine with a noise lowering function. The high-speed drilling machine comprise a drilling machine body, the right side of the bottom of the drilling machine body is fixedly connected with a stand column, the bottom of the stand column is fixedly connected with a base, and the top of the drilling machine body is fixedly connected with a transmission mechanism. The right side of the drilling machine body is fixedly connected with a driving motor, an output shaft of the driving motor is fixedly connected with a driving rotary shaft, the top end of the driving rotary shaft penetrates through the transmission mechanism and extends into the transmission mechanism, and the left side of the drilling machine body is fixedly connected with a silencer.According to the high-speed drilling machine, by arranging the base and the silencer, the noise lowering function is achieved, sounds caused by drill bit transmission shaft rotation are subjected to noise lowering through the silencer, vibration between a machined workpiece and the drilling machine is subjected to noise lowering through a damping device in the base when the drilling machine is used, it is avoided that hearing of a worker is damaged by noise pollution damage, health of the worker is guaranteed, and the fame and benefits of factories are guaranteed.

The invention relates to the field of flow detection and discloses a humanoid intelligent control method for vibration amplitude of a Coriolis mass flowmeter. The humanoid intelligent control method for the vibration amplitude of the Coriolis mass flowmeter comprises the following steps: dividing the vibration of a measuring tube of the Coriolis mass flowmeter into a vibration starting and amplitude stabilizing stage and an interference suppression stage, and dividing vibration starting and amplitude stabilizing vibration into 5 characteristic states and interference suppression vibration into 3 characteristic states according to errors of the vibration amplitude and given amplitude and an error variation trend; constructing 8 corresponding control modes by imitating the control experience of human by aiming at 8 different characteristic states; selecting the corresponding control mode by applying intuitional reasoning according to the current characteristic state of the vibration of the current measuring tube, and outputting amplitude gain. The humanoid intelligent control method disclosed by the invention has the beneficial effects that the vibration-starting speed and the response speed of the Coriolis mass flowmeter are effectively increased, and the vibration stability is enhanced.

The invention provides a casing embedding steel ball part structure for a motor, relating to a casing embedding steel ball part structure for a motor. The structure consists of a casing (1), a steel ball (2), a bearing chamber (3) and a semi-spherical cavity (4), wherein the bearing chamber (3) is arranged on the bottom of the casing (1); the semi-spherical cavity (4) is arranged on the bottom of the bearing chamber (3); and the steel ball (2) is closely embedded inside the semi-spherical cavity (4). The casing embedding steel ball part structure ensures that the rotor shaft head contact of the motor is changed from surface contact to point contact, so that motor noise generated by the large-area direct contact of the rotor shaft head of the motor and the casing when the motor runs can be avoided, the noise source of the motor is effectively reduced, the service life of the motor is improved, and the electrical performance of the motor is improved.