66results about How to "Avoid high frequency noise" patented technology

The present invention relates to a device for machining mechanical parts by means of a hollow cylindrical tool presenting a distal end with a free edge that is shaped to perform machining when said tool is rotated about its axis. In accordance with the invention, the hollow cylindrical tool is fitted internally with a transverse member forming a shaving-breaker, and said hollow cylindrical tool is secured axially to a distal end of a hollow cylindrical spindle, said hollow cylindrical spindle being mounted to rotate about its own axis on a support plate, and being driven externally by rotary drive means mounted on said support plate, and said hollow cylindrical spindle having a proximal end facing and directly adjacent to a hollow cylindrical endpiece secured to said support plate and connected to a suction hose, such that the machining shavings can be evacuated internally by passing successively through the hollow cylindrical tool going round the transverse member forming a shaving-breaker, through the hollow cylindrical spindle, through the hollow cylindrical endpiece, and through the suction hose.

A method for performing a frame erasure concealment for a higher-band signal involves calculating a periodic intensity of the higher-band signal with respect to pitch period information of a lower-band signal; comparing the periodic intensity to a preconfigured threshold and, if the periodic intensity is greater or equal to the preconfigured threshold, performing the frame erasure concealment with a pitch period repetition based method. If the periodic intensity is less than the preconfigured threshold, performing the frame erasure concealment with a previous frame data repetition based method. A device for performing a frame erasure concealment includes a periodic intensity calculation module, a pitch period repetition module, and a previous frame data repetition module. The pitch period repetition module performs the frame erasure concealment with a pitch period repetition based method; and the previous frame data repetition module performs the frame erasure concealment with a previous frame data repetition based method.

A parallel resonance frequency can be adjusted in order to stably and securely block different high frequency noises flowing into a line such as a power feed line or a signal line from electric members including a high frequency electrode within a processing chamber. A filter 102(1) coaxially accommodates a coil 104(1) within a cylindrical outer conductor 110, and a ring member 122 is coaxially installed between the coil 104(1) and the outer conductor 110. The ring-shaped member 122 may be a plate body of a circular ring shape on a plane orthogonal to an axial direction of the outer conductor 110 and made of a conductor such as cupper or aluminum and electrically connected with the outer conductor 110 while electrically insulated from the coil 104(1).

The invention discloses an image enhancement method and a device thereof as well as an image low frequency component computing method and a device thereof. When each pixel to be filtered is computed, according to the relevance of the position and the grey value of the pixel to be filtered and each pixels in the space thereof, bilateral filtering operators corresponding to each pixel in the spatial neighbourhood are computed, thereby obtaining different bilateral filtering operators which are obtained by being adaptively adjusted according to the position and grey value in the spatial neighbourhood; then according to the position and grey value of each pixel in the spatial neighbourhood of the current pixel to be filtered, the bilateral filtering operators respectively corresponding to each pixel in the spatial neighbourhood are computed, the low frequency component obtained by the pixel to be filtered in an image can be input, thereby considering the pixels which are closest in the position and the grey value, avoiding the occurrence of high frequency noise and the lost of edge information to a certain extent, and further improving the quality of the enhanced image.

A fuel delivery rail assembly for supplying fuel to a plurality of fuel injectors in an engine is provided. The assembly includes an elongate conduit having a longitudinal fuel passage therein, a fuel inlet pipe, and a plurality of sockets. One wall of the conduit opposite to the socket mounting wall includes a flat or arcuate flexible absorbing surface. A high-frequency noise suppressing device such as a binding member is fixed within the conduit for connecting the one wall and the socket mounting wall. The binding member includes is comprised of a pipe, a bar or a rigid block. The binding member may be a body portion of an extending socket terminating with the one wall. Thus, fuel pressure pulsations and shock waves are reduced by bending of the absorbing surface, and emission of high-frequency noise is eliminated.

A fuel delivery rail assembly for supplying fuel to a plurality of fuel injectors in an engine includes an elongated conduit having a longitudinal fuel passage therein, a fuel inlet pipe, and a plurality of sockets. One wall of the conduit opposite to the socket mounting wall includes a flat or arcuate flexible absorbing surface. A high-frequency noise suppressing component such as a rib, a cavity or a clamp is applied to the one wall opposite to the absorbing surface. Thus, fuel pressure pulsations and shock waves are reduced by bending the absorbing surface, and emission of high-frequency noise is eliminated.

The invention discloses a coupling type intelligent bearing monitoring device arranged on a bearing. The coupling type intelligent bearing monitoring device is characterized by comprising a shell and a rotating speed coded disk, wherein the rotating speed coded disk is a round coded disk coaxial with the shell; an intelligent monitor is axially inserted into a gap between a rotating ring and a fixed ring of the bearing and forms an interference fit with the bearing; and two strain gage type acceleration sensing devices, a rotating speed sensing device and a temperature sensing device are embedded in the shell and all connected with a circuit board on the end face of the shell through a signal output line. The invention has the obvious advantages that the low-frequency-band characteristics of the bearing can be effectively extracted; the reliability and the effectiveness of signals are improved; all the sensing devices are used as a part of the intelligent bearing and easy to mount and demount, and the damage to the bearing structure and the bearing stress are reduced; and sampling is triggered by the rotating speed, thereby realizing the synchronous trigger acquisition of multiple parameters of the bearing.

The present invention provides an LED lighting device and an illumination apparatus, wherein the LED lighting device includes a pair of input terminals to which AC voltage is input, the AC voltage being phase-controlled by a dimmer for phase-controlling AC voltage of an AC source; a damping circuit which has a resistor inserted to a position, into which input current flows from the AC source via the dimmer in series, and a capacitor and an inductor which form a closed circuit together with the AC source and the dimmer, and suppresses high-frequency vibration generated in the dimmer when a phase control element of the dimmer is turned on; and an LED lighting circuit which rectifies AC voltage phase-controlled and input via the pair of input terminals, converts DC output voltage, which is obtained by rectification, so that the voltage adapts to a load, and lights the LED. The illumination apparatus includes an illumination apparatus body, an LED lighting device and an LED.

A semiconductor package removes power noise by using a ground impedance. The semiconductor package includes an analog circuit block, a digital circuit block, an analog ground impedance structure, a digital ground impedance structure, and an integrated ground. The integrated ground and the analog circuit block are electrically connected via the analog ground impedance structure, and the integrated ground and the digital circuit block are electrically connected via the digital ground impedance structure, and an inductance of the analog ground impedance structure is greater than an inductance of the digital ground impedance structure.

The invention, which belongs to the optical metrology field, discloses a calibration apparatus for laser micro energy, wherein the apparatus is used for calibration of a laser micro energy meter. The calibration apparatus comprises a calibrated laser light source, a pulse generator assembly, a measurement assembly and a computer system. The pulse generator assembly includes two choppers having different rotating speeds and clear apertures, so that continuous lasers output by the calibrated laser light source are chopped into pulse lasers with low repetition rates and low duty ratios. Besides,the measurement assembly uses two different detectors to respectively measure laser powers and pulse widths of the pulse lasers; and the computer system utilizes built-in software to collect measuring signals of the measurement assembly and a micro energy meter with calibration; and corresponded calculating formulas are employed to obtain calibration parameters. According to the invention, magnitude recurrence and magnitude transmission of laser micro energy are realized; and accurate recurrence can be carried out on laser energy with 1 muJ to 0.1 pJ.

The invention discloses a globally optimized time-varying sparse deconvolution method and apparatus. The method comprises the following steps: a frequency domain time-varying part spectrum deconvolution model of unstable state seismic data is constructed; a reflection coefficient pulse number is determined through utilization of the limited update rate principle and an unstable state seismic data effective bandwidth; through a very fast simulated annealing algorithm and the frequency domain time-varying part spectrum deconvolution model, the time position of reflection coefficient pulses of the frequency domain time-varying part spectrum deconvolution model is searched; with regard to the searched time positions, iteration is carried out through utilization of a least square method, and reflection coefficient pulse amplitudes of the time positions are determined; for each iteration, available time position and amplitudes are determined according to system energy; through utilization of a square error of part spectrum observation data and part spectrum synthesized data, whether convergence of the iteration exists is determined; if the convergence exists, iteration stops; and according to the reflection coefficient pulse number and the available time positions and amplitudes, a nonzero reflection coefficient sequence is reconstructured. Through utilization of time varying wavelets, the method is more realistic. The non-linear method and the linearity method are combined, and the calculating precision is raised.

A motor vibration damping device includes several dampers and a connecting part. Each damper is disposed in a fixing hole of a mechanic fixing piece for reducing motor vibration energy transmitted to the mechanic fixing piece and the connecting part connects the dampers.

A thermocouple (6) is provided for detecting a temperature of the tip of a needle electrode (1). The thermocouple (6) includes a tip connecting portion (18) where the tips of a pair of coated wires (8, 9) are electrically connected to each other and a tip coated portion where the tip connecting portion (18) is coated with polyolefin synthetic resin. The tip coated portion is bonded and fixed to the needle electrode (1). They provide a needle electrode device for medical application capable of being compact with the needle electrode provided with the thermocouple and of detecting a temperature using the thermocouple with high accuracy.

The present invention discloses a self-bias PLL including a phase frequency detector, a charge pump, a loop filter, a voltage control oscillator, a divider and a bias current converter. A charging or discharging current output from the charge pump equals to a first control current. A resistor of the loop filter is controlled by a first control voltage a second control voltage which is adjusted according to the first control voltage and a second control current. The loop filter increases or decreases the first control voltage according to the charging or discharging current output from the charge pump. The voltage control oscillator generates a bias current and an oscillation voltage according to the first control voltage and increases or decreases an oscillation frequency according to the increase or decrease of the oscillation voltage. The circuit structure of the self-bias PLL is simple and the self-bias PLL has a low jitter.

The invention discloses a forward interpolation method for an angle sensor and a rotary encoder. The method comprises the steps of prejudging an angle where a current mechanical structure is located before a next sensor sample is output; according to different application scenes and requirements on prediction precisions, selecting outputs of different numbers of sampling inductors as input conditions of an interpolation algorithm; and when two sampling outputs are used as interpolation basic values, simplifying a uniformly accelerated motion into a uniform motion. According to the forward interpolation method for the angle sensor and the rotary encoder provided by the invention, the limitation of a low-speed sampling induction unit is effectively broken through, the valid data refresh of the angle sensor and the rotary encoder is greatly improved, and the real-time angle information of a rotor is provided in time; with the algorithm, the high-frequency noise caused by an error betweenan interpolation prediction and an actual sampling result is avoided so that the outputs are more smooth.

The invention relates to a maximum torque current ratio control method and device. The method comprises the steps: carrying out open-loop starting on a motor so as to enable the motor to operate; after the first rotating speed of the motor reaches a preset frequency, carrying out rotating speed and current double-closed-loop control on the motor according to the actual rotating speed, determined through counter electromotive force, of the motor; when it is determined that a load is loaded on the motor and a driving voltage output to the motor by a three-phase inverter bridge is smaller than a voltage upper limit, adopting a maximum torque current ratio control method based on virtual signal injection to obtain a current vector angle given value; and controlling the motor to operate according to the current vector angle given value. According to the method provided by the embodiment of the invention, the dependence on the parameters of a permanent magnet synchronous motor is reduced in an implementation process while the defects of torque ripple, high-frequency noise, additional loss and the like existing in a traditional high-frequency signal injection method are effectively avoided; and requirements in the aspects of real-time calculation complexity, dynamic response performance, stability and the like in control are comprehensively considered while the operation efficiency of the permanent magnet synchronous motor is improved.

The invention discloses a nozzle corner vortex generator capable of inhibiting the low-frequency pressure pulsation of an opening jet-flow wind tunnel, and the generator comprises two nozzles (2), wherein each wall of the nozzles (2) is fixedly provided with two turbulent flow bodies (1). The turbulent flow bodies (1) are respectively of an arc-shaped structure which consists of a rectangular turbulent flow body bottom surface (11), two turbulent flow body side surfaces (14), and a flow direction surface (12). The nozzle corner vortex generator carries out the long-distance corner diversion ofthe air flow of a nozzle, changes the vortex direction, breaks a large-scale vortex structure generated by the unstability of a shear layer, inhibits the low-frequency pressure pulsation to the greatextent, and can greatly reduce the low-frequency pressure pulsation of the wind tunnel.

A motor rotor includes a magnetic yoke and a rubber magnet located within the magnetic yoke. At least one pattern is formed on a surface of the rubber magnet, which faces the magnetic yoke. The manufacturing method of the motor rotor is to provide a rubber magnet having flat surfaces, and at least one pattern is formed on a surface of the rubber magnet. The rubber magnet is curved to correspond with the inner surface of the magnetic yoke by the way that the patterned surface of the rubber magnet faces outside. The rubber magnet is put inside the magnetic yoke.

The invention discloses a generation device and method for multiway synchronous frequency division multiplexing millimeter wave sweep signals. The device comprises a special integrated circuit, a digital signal processor and multiway synchronous frequency division multiplexing channels. The special integrated circuit transmits sine waveform data of a plurality of frequencies to the digital signal processor. The digital signal processor sends the received waveform data to the corresponding synchronous frequency division multiplexing channels and cycles the received waveform data every other certain time. Each of the multiway synchronous frequency division multiplexing channels comprises a digital to analog converter, a lowpass filter, a mixer and a frequency doubling amplifier network which are connected in sequence, and finally multiway sweep signals are generated. The device is high in signal to noise ratio and good in synchronism, and the frequency division multiplexing is realized really.

An in-vehicle structure for an inverter includes a bracket, a damping bush, and a braided wire. The bracket is made of a metal plate, and serves as a metal fitting for fixing the inverter to a transmission (a vehicle). The damping bush is fitted between the bracket and either one of a case of the inverter and the transmission. The damping bush is made of an insulator. The braided wire electrically connects the case of the inverter to the transmission. The braided wire is wired along the metal plate of the bracket.

A robot includes a driving unit, a flexible board including a power line that transmits electric power to the driving unit, and a choke coil connected to the power line. A band rejection filter is formed by parasitic capacitance, which is formed by the electric line, and the choke coil.

The invention discloses a laterally-open through groove silencer which comprises a silencer drum, an air inlet pipe and an exhaust pipe. The silencer drum is integrally sealed, two end faces of the silencer drum are respectively an air inlet end face and an exhaust end face, the air inlet end face and the exhaust end face form inclination angles with the axial direction of the silencer drum, and the inclination direction is towards the exhaust end face. The laterally-open through groove silencer further comprises a partition plate, the partition plate divides the silencer drum into an upper cavity and a lower cavity, the connecting line position where the air inlet pipe and the exhaust pipe are located on the cross section of the silencer drum is positioned on the midperpendicular of the partition plate, and two sides of a projection line of the air inlet pipe of the partition plate are respectively provided with at least one partition plate through grooves symmetric with respect to the projection line. The technical characteristics of the silencer in various aspects such as the noise reduction effect and heat dissipation performance are improved by adopting a cascade mode of the upper cavity and the lower cavity and ingenious design of an internal structure, and the laterally-open through groove silencer is simple and stable in structure, good in use stability and long in service life.

Provided is a three-phase transformer with a built-in high-frequency inductor. An auxiliary core column of the transformer is formed by splicing a plurality of columnar silicon-iron magnetic powder cores. Due to the fact that air gaps of the columnar silicon-iron magnetic powder cores are evenly distributed on the columnar silicon-iron magnetic powder cores, high-frequency loss and high-frequency noise of the inductor can be effectively avoided, and effective work of the transformer can be also ensured at high switching frequency.

The invention relates to a sensorless control method for a permanent magnet synchronous motor. In the sensorless condition of the permanent magnet synchronous motor, two major methods are mainly provided for obtaining rotor information, one method is a method for constructing a state observer, and rotor position information is obtained from a back electromotive force signal. Due to the fact that back electromotive force signals are weak when the motor operates at a low speed, the method is poor in performance of estimating the rotor position at a low speed, the permanent magnet synchronous motor does not generate back electromotive force at a zero speed and cannot estimate the rotor position, but has excellent performance in a medium-high speed range. The method comprises the following steps: establishing a permanent magnet synchronous motor model, constructing a rotor flux linkage observer to observe rotor position information, carrying out initial value estimation and compensation onthe rotor flux linkage observer, constructing a rotating speed observer, converting the rotor position information into rotating speed information, and constructing an id controller to complete errorcompensation. The sensorless control method is used for the permanent magnet synchronous motor.

In order to solve the problems in the prior art, the invention innovatively provides a fan rotating speed regulation and control method for a server, which comprises the following steps that: a BMC (Baseboard Management Controller) acquires and calculates the added value of the output power of a power supply in first time; the BMC determines the interval where the added value is located accordingto the interval; the rotating speed of a fan is adjusted to a corresponding fan rotating speed value till the server is in a stable operation working state. The invention further provides a fan rotating speed regulation and control device for the server.. The problems that an existing fan regulation and control mode is single, and energy consumption is large are effectively solved. The fan regulation and control efficiency is effectively improved while energy cost is reduced. the temperature of the corresponding PCIE equipment is obtained through the BMC. According to the corresponding relationships between a PCIE area and fans, the corresponding fans are controlled to adjust the rotating speed, the heat dissipation efficiency and the utilization rate of the fans can be improved, the rotating speed of each fan is independently controlled, and resonance and high-frequency noise caused by the fact that the multiple fans operate at the same rotating speed can be avoided.

The invention discloses an intelligent video image retrieval method based on a neural network self-temperature fault and a knowledge conduction mechanism, which improves the retrieval precision of a small model while ensuring the real-time performance of the model, and achieves balance between the precision and the efficiency as far as possible. A gamma correction module is arranged, and through local adjustment of the image, illumination non-uniformity robustness is achieved, detail discernibility is improved, high-frequency noise is avoided, and universality is high; a self-temperature fault mechanism is established, local self-supervision, continuous reflection and learning parameter adjustment of the neural network are allowed, deep semantic information of the image is fully learned, rapid convergence of the neural network is achieved, and retrieval precision is improved; a knowledge conduction mechanism is adopted, the model precision is improved, the model time delay is reduced, network parameters are compressed, and finally a student model with high performance and high precision is obtained; and taking shallow feature knowledge as a learning target through a conduction mechanism, reconstructing deep features by adopting a VAE variational self-encoding model so as to generate a learning result, and measuring the learning result and the target so as to complete a learning task.

The present invention provides a printed circuit board includes a base insulating layer, first to third signal lines, a first cover insulating layer and a conductive layer. Wide parts are formed in the first to third signal lines. The first cover insulating layer is provided on the base insulating layer so as to cover the wide parts. The conductive layer is provided on the first cover insulating layer so as to cover a portion above the wide parts. A capacitive element is formed of the wide part, the cover insulating layer and the conductive layer. Generation of high-frequency noise can be prevented.