57 results about "Periodic wave" patented technology

The invention discloses a power capacitor bank dielectric loss on-line monitoring method, particularly relates to the technical field of power system equipment insulation state monitoring, and is used for solving the problems of insufficient signal synchronization precision and large dielectric loss calculation error under complex electromagnetic interference in the existing method. The method comprises the following steps: acquiring voltage and current signals in real time and dynamically tracking fundamental frequency; intercepting a main period waveform, constructing phase space trajectory analysis complexity, and generating distortion features in combination with symbol sequence transfer entropy; dynamically adjusting filtering parameters based on the distortion characteristics and the Lyapunov exponent gradient; calculating a high-precision phase difference through zero crossing point interpolation correction and sliding window filtering, and finally determining a dielectric loss value; through dynamic frequency tracking, nonlinear feature collaborative analysis and an adaptive filtering strategy, noise interference is effectively suppressed, phase synchronization precision and dielectric loss calculation reliability are improved, and accurate and real-time monitoring support is provided for insulation performance evaluation of the power capacitor bank.

The invention relates to the technical field of intracranial pressure monitoring, in particular to a multi-modal fusion-based intracranial pressure dynamic prediction method for a patient with craniocerebral injury, which comprises the following steps of: acquiring an electroencephalogram signal, extracting a peak value to a termination section path, judging whether a waveform slope is consistent with an intracranial pressure direction or not, identifying an unsynchronized response segment, and obtaining a neural migration section mark set. According to the method, the non-cooperative state between the neural activity and the pressure change is distinguished by recognizing the periodic waveform which does not cause the intracranial pressure response in the electroencephalogram signal, and the time period with the inconsistent regulation rhythm is positioned by combining the continuous expression of the ventricular volume and the arterial pressure direction deviation; the method comprises the following steps of: extracting response sequence and direction characteristics of arterial pressure, cerebral blood flow and neural signals in a continuous section, enhancing a rhythm corresponding relation among multi-modal signals, adjusting a signal alignment structure according to offset direction difference and a rhythm starting point, forming a linkage fragment sequence under a unified time reference, and obtaining a multi-modal signal sequence; and linkage and deduction of asynchronous response information on a structural level are promoted.

The wave energy capturing and wave absorbing integrated device based on the Helmholtz resonance principle comprises a dike body, the dike body is sequentially provided with a front baffle, a front air chamber, a middle air chamber, a rear air chamber and a rear baffle in the wave incidence direction, and a three-stage series type wave absorbing structure is jointly formed; a front gas-guide tube and a rear gas-guide tube are respectively arranged at the tops of the front gas chamber and the rear gas chamber, and the front gas-guide tube, a top gas cavity of the middle gas chamber and the rear gas-guide tube are respectively connected with a confluence header pipe through pipelines; a one-way air inlet valve and a one-way exhaust valve are arranged on the top of each air chamber and each air guide pipeline; the air outlet end of the confluence header pipe is connected with a one-way air turbine. On the premise that the physical size of the structure and the construction cost are not remarkably increased, the wave absorbing frequency band can be effectively widened, particularly the wave absorbing performance on long-period waves is remarkably improved, and therefore the defects of a traditional breakwater and a traditional OWC device in the aspects are overcome.

The invention discloses a clock synchronization method and device for multi-modal human factor data acquisition, edge computing equipment and a medium, which are used for improving the accuracy of data alignment. The system controls a first human factor data acquisition device to send a periodic wave signal to each second human factor data acquisition device; each human factor data acquisition device carries out sampling according to the periodic wave signal; a human factor data receiving end in the system receives data packets sent by each human factor data acquisition device, and each data packet carries a packet number; determining absolute time corresponding to each data packet according to the packet number carried by each data packet; and performing data alignment processing on each data packet according to the absolute time corresponding to each data packet. According to the invention, since the data acquisition devices all take the moment of sending the periodic wave signals as the starting moment of data acquisition, a local real-time clock crystal oscillator is not needed, so that strict synchronization of data acquisition is realized, and the problem of data asynchronization caused by clock drift between the devices is eliminated.

The invention discloses a nonlinear acoustic transducer control method and system based on an Aubry-Mather set, and belongs to the technical field of acoustic transducers. The method comprises the following steps: firstly, based on an Aubry-Mather set theory, constructing a nonlinear vibration model used for describing nonlinear vibration of a transducer diaphragm; secondly, based on a nonlinear vibration model, regional piezoelectric driving and dynamic phase regulation are carried out to simulate a quasi-periodic fluctuation mode; then, on the basis of fluctuation characteristics disclosed by the nonlinear vibration model, a multi-diaphragm collaborative vibration system is constructed, and quasi-periodic superposition of sound waves is realized by optimizing diaphragm space layout; and finally, based on stiffness parameters in the nonlinear vibration model, integrating a micro electro mechanical system (MEMS) process and a nonlinear material, and realizing equivalent nonlinear stiffness on a physical device through gradient polarization design. The dynamic adaptability, the energy transfer efficiency and the high-frequency output performance of the transducer in a broadband range are effectively improved, and the transducer is particularly suitable for ultrasonic imaging and other high-frequency acoustic application scenes.

The invention provides an active driving sound effect generating device which can reduce the calculation amount in the process of generating a sound signal, can easily adjust the tone, and can generate a driving sound effect with high reality. An active travel sound effect generation device (100) is mounted on a vehicle (300) and comprises: a waveform generation unit (10) that generates a signal from a waveform table on the basis of vehicle information; and a speaker (30) that outputs the signal generated by the waveform generation unit (10), the waveform table being a periodic waveform table in which an end point and a start point of the waveform table are continuous, and including a plurality of frequency components.

A spread spectrum switching power conversion circuit, a clock generation circuit and a clock generation method. The spread spectrum switching power conversion circuit includes: a power stage circuit including an inductor and a power switch for switching the power switch to perform power conversion according to a switching signal with spread spectrum; a variable frequency oscillator for generating a spread spectrum clock signal according to a spread spectrum control signal; a spread spectrum control circuit for generating the spread spectrum control signal according to a first clock signal and a second clock signal; and a pulse width modulation circuit for generating the switching signal according to a feedback signal based on the spread spectrum clock signal; wherein the spread spectrum control circuit samples and operates a first periodic waveform with periodicity and a first random waveform with randomness to generate the spread spectrum control signal. The first random waveform is generated according to the first clock signal, and the first periodic waveform is generated according to the second clock signal.

The invention relates to the field of power quality monitoring, in particular to a power quality monitoring method and system based on an intelligent fusion terminal, and the method comprises the steps: obtaining the historical power quality data of the intelligent fusion terminal, and carrying out the preprocessing; performing curve fitting on the preprocessed electric energy quality data, extracting a maximum value sequence and a minimum value sequence from the fitted curve, calculating the periodic probability of a preset number of extreme points in a corresponding time period, and judging the periodic characteristics of the electric energy quality signal; constructing a period window, calculating a period index according to the consistency of the power quality data in the period window, analyzing the trend of the period index changing along with the period length, obtaining the optimal feature point, determining the optimal period length and the optimal period wave band, and completing the monitoring of the power quality. According to the method, the nonlinear load problem of the power grid is effectively solved by dynamically adjusting the length of the period window, fitting the spline curve and analyzing the period index, and the accuracy and the processing efficiency of period identification are improved.

To output a stable waveform to a device which operates at frequencies lower than a clock.SOLUTION: The frequency adjustment device includes: a counter section 2 of a binary counter for counting a clock signal CLK; and a waveform output section 3 for outputting a waveform in accordance with an output from the counter section 2 and returning a cycle-delayed value to the counter section 2. By performing frequency division with an addition value FIN[7:0], a frequency-division circuit outputs a pulse output PLSOUT having a frequency lower than the clock signal CLK, and a fluctuation-prevention circuit prevents cycle fluctuation caused by a carry generated when counting is completed.SELECTED DRAWING: Figure 1

The present application relates to large ring piece detection technical field, especially to a kind of portable detection method and instrument of large ring piece flatness and machining allowance, the method includes first establishing the workpiece coordinate system being fixed with ring piece, and based on the coordinate system, the circumferential thickness distribution is quickly obtained, the upper end surface profile curve is generated, the defects types such as whole inclination, local concave-convex or periodic wave deformation are diagnosed synchronously by real-time analysis to profile curve, then, different fine scanning strategies are adaptively triggered according to the diagnosis result, to obtain corresponding high-precision topographic data, finally, the end surface flatness error and global minimum machining allowance are calculated by fusing multi-source data, and the process machinability of ring piece is directly judged accordingly.The present application realizes closed loop from rapid detection, intelligent diagnosis to process decision, solves the problems of low efficiency, inaccurate defect judgment, detection and machining decision disjointedness in large ring piece field detection.

The application relates to the technical field of data processing, in particular to a transformer fault detection method and system; the method comprises the following steps: collecting current data of a transformer; the current data is divided into a plurality of time windows with a preset size, the change of the current data in the time windows is analyzed, the pulse shape kurtosis for representing pulse type faults and the periodic waveform skewness for representing periodic distortion faults are calculated; a pulse fault dominant factor is constructed based on the pulse shape kurtosis and the periodic waveform skewness, the data in the time windows is classified based on the pulse fault dominant factor, corresponding random cutting trees are constructed for different types of data, and a random cutting forest containing at least two different types of random cutting trees is formed; the real-time collected current data is input into the random cutting forest for abnormality detection, and a transformer fault detection result is obtained. The application has the effect of improving the transformer detection accuracy.

The invention provides a flexible wireless passive multi-mode sensing integrated acquisition method and system, and the method comprises the steps: carrying out the integrated preparation and manufacturing of a flexible antenna, a flexible chip and a multi-mode sensor, enabling a ring oscillator to start oscillation to generate a periodic waveform, and enabling a clock to generate a slow periodic signal after the frequency division of a counter; when the capacitor voltage of the multi-mode sensor reaches a set threshold value, counting is stopped, and a counting value is sent to a channel encoder for channel encoding through a single-slope ADC; the coded logic signal enters a modulation module after the current is amplified by a buffer, the modulated signal is reflected back to a reader, the signal is received, demodulated and extracted and then decoded, and a count value of the charging time and a clock signal are obtained; and acquiring a sensing physical quantity signal according to the count value of the charging time, and acquiring temperature information according to the clock signal. According to the technical scheme, the technical problems that in the prior art, a multimode integrated sensor is usually large in size, an external power source is needed for power supply, and the integration and intelligence degree is low are solved.

The invention discloses a gate control method and device based on a sea sluice control system and electronic equipment, and relates to the technical field of sea sluice control, and the method comprises the steps: inputting the terrain range data of a target sea sluice project and a terrain division grid into a wave forecasting model, performing sea wave simulation on a target position point outside the engineering area based on the weather forecast data in the preset time period by using the wave forecast model, outputting wave sequence data of the target position point in the future preset time period, comparing the wave sequence data with a wave data threshold value to obtain a wave comparison result, and when the wave sequence data is greater than the wave data threshold value, outputting the wave comparison result. A closing control signal is sent to the gate control equipment, and the gate is closed within the specified time period; and when the duration of closing the gate reaches the preset warning duration, an opening control signal is sent to gate control equipment, and the gate is opened. The technical problems that in the related technology, a breakwater is adopted for resisting long-period waves to a wharf, the influence of the waves cannot be eliminated, and the safety of ships in the berth is affected are solved.

The invention discloses a brushless direct current motor driven high-precision optical switch device for a cold atomic clock and a control method, the device comprises an FPGA control panel, a three-phase brushless direct current motor, a light blocking blade, a driving circuit and a photoelectric detection circuit, the light blocking blade is fixed on a motor rotating shaft, and the blade is provided with a 15-degree light hole and a symmetrically excavated mass balance structure. It is ensured that the laser on-off time accounts for 17% and the rotational inertia is uniform; the FPGA starts the motor through six-step commutation, estimates an electrical angle in real time in combination with Hall signal interpolation, is switched to a sine wave control mode to generate a seven-segment SVPWM waveform, and dynamically adjusts PID parameters to realize that the periodic fluctuation of the motor is less than + / -0.25 ms. The photoelectric detection circuit feeds back the rotating speed to form closed-loop control, and the drive circuit is integrated with a dead-zone compensation module to reduce harmonic interference. The extinction ratio is superior to 40dB, the frequency accuracy and long-term stability of the cold atomic clock are improved, and the cold atomic clock is suitable for high-precision sequential control scenes such as laser cooling and atomic detection.

This invention discloses an object detection system, an object detection method, and an object detection apparatus. The object detection system includes multiple ranging sensors, a wave transmission control unit, and a determination unit. The multiple ranging sensors have a wave transmitting unit that transmits ultrasonic waves and a wave receiving unit that receives reflected waves of ultrasonic waves reflected by an object. The ranging sensors detect objects based on the reflected waves. The multiple ranging sensors are positioned at different locations within the vehicle. The wave transmission control unit sets the ranging sensors whose detection range includes the area of ​​an object previously detected when power supply to the vehicle begins, as the beginning of the wave transmission sequence, and repeatedly performs periodic wave transmission control, sequentially transmitting ultrasonic waves from each of the multiple ranging sensors according to this wave transmission sequence. The determination unit determines an object as a detected object when any of the multiple ranging sensors detects an object a predetermined number of times.

The present invention discloses an online monitoring method for dielectric loss of a power capacitor group, which specifically relates to the technical field of insulation status monitoring of power system equipment, and is used to solve the problems of insufficient signal synchronization accuracy and large dielectric loss calculation error in existing methods under complex electromagnetic interference; the method comprises: real-time acquisition of voltage and current signals and dynamic tracking of fundamental frequency; intercepting the main cycle waveform and constructing a phase space trajectory to analyze complexity, combining the symbol sequence transfer entropy to generate distortion characteristics; dynamically adjusting filtering parameters based on the distortion characteristics and Lyapunov exponent gradient; calculating high-precision phase difference through zero-crossing interpolation correction and sliding window filtering, and finally determining the dielectric loss value; and effectively suppressing noise interference through dynamic frequency tracking, collaborative analysis of nonlinear characteristics and adaptive filtering strategies, thereby improving phase synchronization accuracy and dielectric loss calculation reliability, and providing accurate and real-time monitoring support for insulation performance evaluation of power capacitor groups.

The application discloses a ventricular premature beat type determination method, device, equipment and medium, and the method comprises the following steps: performing feature wave identification on a periodic waveform in a to-be-identified waveform; if no feature wave exists in the periodic waveform, determining a positive wave peak value and a corresponding positive wave peak time point, and a negative wave peak value and a corresponding negative wave peak time point according to a voltage corresponding to each time point in the periodic waveform; for any time point, if a comparison result of the voltage corresponding to the time point and the positive wave peak value and the negative wave peak value satisfies a first preset condition, and a comparison result of the time point and the positive wave peak time point and the negative wave peak time point satisfies a second preset condition, then the waveform between the time point and the wave peak time point is determined as a target waveform; and according to a position of the target waveform in the periodic waveform, left ventricular premature beat or right ventricular premature beat is determined. The detection and judgment of the ventricular premature beat type are automatically realized, and the detection efficiency is improved.

The invention relates to the technical field of large ring piece detection, in particular to a portable detection method and instrument for flatness and machining allowance of a large ring piece, and the method comprises the steps: firstly, building a workpiece coordinate system fixedly connected with the ring piece, rapidly obtaining circumferential thickness distribution based on the coordinate system, generating an upper end face contour curve, and carrying out the detection of the flatness and machining allowance of the ring piece; through real-time analysis of the contour curve, the defect types such as overall inclination, local concave-convex or periodic wave deformation and the like are synchronously diagnosed, then different fine scanning strategies are adaptively triggered according to diagnosis results to obtain corresponding high-precision morphology data, and finally, the high-precision morphology data are obtained. And fusing multi-source data to calculate an end face flatness error and a global minimum machining allowance, and directly judging the process machinability of the ring piece according to the end face flatness error and the global minimum machining allowance. According to the invention, the closed loop from rapid detection and intelligent diagnosis to process decision is realized, and the problems of low field detection efficiency, inaccurate defect judgment and disjunction between detection and processing decision of a large ring piece are solved.

The disclosure relates to a grating for optical measurements comprising: a base plate extending in a plane in two spatial directions; a plural number q of periodic patterns, each with a surface and space periodic wave optical mask and each with a different interval frequency; wherein the periodic patterns are arranged adjacent each other in the base plate. The disclosure further relates to a grating, an assembly for measurements of one or more optical parameters of a medium and a method of using the assembly.

The application discloses a kind of sea-air interface momentum flux calculation methods of coupling sea wave data, it is related to marine atmospheric boundary layer flux observation technical field, including the threshold value screening of required turbulent flux elements based on the calculation of eddy correlation method, outlier processing is handled, and three-dimensional wind speed is rotated to coordinate;The sea surface undulation data obtained are processed to obtain sea wave spectrum and wave parameter, and based on sea wave spectrum calculation Q p ; Based on the theory of Monin-Obukhov similarity, Monin-Obukhov length, atmospheric stability and 10-meter sea wind U 10 ; Based on the above data, the friction velocity is divided into wind speed term and wave mixing term for fitting, and finally the momentum flux is obtained. The application couples the wave period, wave direction and other key data of sea wave into the calculation system, introduces the Q p peak parameter to represent the sea wave state, fully considers the influence of sea wave on momentum flux, improves the calculation accuracy, and reduces the requirement for observation instrument.

The invention provides an optical scanning device. An optical scanning device (10) is provided with: a mirror section (31); an outer actuator (35) that rotates the mirror section (31) back and forth about a predetermined rotation axis; and an optical deflector control unit (20) that supplies a drive voltage (Vx) having a periodic waveform to the outer actuator (35), the periodic waveform including a rising section (Db) having subsections (Db1-Db5). Subsections (Db2, Db4) of the rising section (Db) are set so that the rate of change (Ex) of the drive voltage (Vx) is maintained at a prescribed value (Exc). The rate of change (Ex) of the drive voltage (Vx) in the subsections (Db1, Db5) is set to a value greater than Exc.

The invention discloses a liquid drop wrapped cell detection method and device based on a PMT signal and AI and a medium. The method comprises the following steps: collecting a PMT waveform signal of a liquid drop detection area; performing peak detection on the PMT waveform signal, and intercepting a periodic waveform; performing feature extraction on the periodic waveform through an artificial intelligence neural network to obtain a waveform feature of one period; and carrying out feature classification on the waveform features, and outputting a classification result as a detection result. According to the method, waveform data generated by liquid drop wrapping cells can be effectively extracted through a waveform feature extraction algorithm for realizing dynamic parameter adjustment, automatic extraction of waveform features is performed by using an artificial intelligence neural network CNN, and the problem that a traditional PMT waveform classification algorithm is insufficient in complex waveform processing capability is effectively solved. Compared with a traditional wave crest detection algorithm, the method has the advantages that the PMT waveform characteristics of the liquid drop wrapped single cells can be captured more accurately, and a more accurate classification result of the liquid drop wrapped cells is given.

The application discloses a photovoltaic inverter harmonic suppression and power grid power quality collaborative optimization method and relates to the technical field of power systems, and comprises the following steps: acquiring a photovoltaic inverter output current wave and marking the wave as a real-time detection wave; acquiring a first historical data point based on a normal current wave in a power grid; acquiring a screening coordinate point based on the first historical data point; acquiring a reference periodic wave based on the screening coordinate point; constructing a real-time detection length based on the real-time detection wave and the reference wave; acquiring a historical detection length based on a normal wave without a harmonic; acquiring a detection length threshold value based on the historical detection length; and classifying the real-time detection wave based on the real-time detection length and the detection length threshold value, and performing different operations on different kinds of real-time detection waves; the application is used to solve the problem that, in the prior art, whether a harmonic appears is determined by frequency and amplitude data, resulting in complicated data comparison and low accuracy of a determination result.

This invention proposes a design method for an omnidirectional icebreaker wave generator in actual ice-covered sea areas. First, data collection and processing are performed, collecting and processing relevant information about the target sea area and sea ice. Then, based on the potential flow theory model, the wave generation period interval, sea ice strain response, wave height scaling factor are calculated. The wave height scaling factor is used to calculate the target wave height and maximum stroke, resulting in the target period wave. Finally, the target period wave is used to obtain the wave generator shape curve, completing the wave generator design.

The present application relates to a kind of arbitrary waveform synthesis device, it includes: vacuum box, electrode plate is arranged in it, and the upper and lower ends of the vacuum box are respectively provided with the through hole for beam passing;First resonant cavity, it is arranged in one side of the vacuum box, for the even electric field generated is concentrated in the upper end of the electrode plate;Second resonant cavity, it is arranged in one side of the vacuum box with the first resonant cavity, and it is below the first resonant cavity, for the odd electric field generated is concentrated in the lower end of the electrode plate;The first resonant cavity uses half wavelength resonant cavity, and the second resonant cavity uses quarter wavelength resonant cavity.The present application can not be limited by frequency, voltage and its structure, and the periodic waveform of arbitrary frequency and voltage can be synthesized, which can be applied in the field of accelerator waveform generation.

This application provides a power consumption simulation method for a system-on-a-chip (SoC). The method includes: acquiring a preset case for the SoC, the operating state of each intellectual property core (IP core) of the SoC when running the preset case, and operating parameters of the SoC, wherein the operating state indicates whether the IP core participates in running the preset case; simulating a periodic waveform file of the SoC running the preset case based on the preset case, the operating state of each IP core, and the operating parameters; and performing power consumption simulation on the periodic waveform file using a power consumption simulation tool according to the operating state and operating parameters of each IP core to obtain a periodic simulated power consumption waveform.

A pulse generator (100), for generating a periodic square wave signal in response to a periodic input signal, includes a first inverter (106), a negative-feedback circuit (108), an adjustable current source (110), and a second inverter (112). The first inverter is configured to invert the periodic input signal, thereby generating a periodic wave. The negative-feedback circuit is configured to couple an output of the first inverter to an input of the first inverter, thereby setting the first inverter in a linear mode. The adjustable current source is coupled to the negative-feedback circuit and is configured to load the first inverter, thereby modifying a duty cycle of the periodic wave produced by the first inverter. The second inverter is configured to invert the output of the first inverter, thereby generating the periodic square wave.

A pulse width modulation method is provided for converting an input signal into a corresponding output pulse width modulation signal. The pulse width modulation method includes the following steps: generating a first linear periodic wave and a second linear periodic wave, wherein the amplitude of the first linear periodic wave is greater than the amplitude of the second linear periodic wave, wherein the first linear periodic wave and the second linear periodic wave are triangular waves or sawtooth waves; and determining whether the level of the input signal is lower than a light load threshold. When the level of the input signal is lower than the light load threshold, the output pulse width modulation signal is generated based on a comparison between the input signal and the second linear periodic wave; and when the level of the input signal is higher than the light load threshold, the output pulse width modulation signal is generated based on a comparison between the input signal and the first linear periodic wave.

The present disclosure refers to an antiseptic or antibiotic agent for use in treating a wound in a subject, wherein the subject is to receive a magnetic field treatment at the wound before, after or concurrently with the application of the agent, and wherein the magnetic field treatment comprises at least two phases of periodic waves, wherein in each consecutive phase a different type of periodic wave is applied, wherein the periodic waves differ in their waveform, their frequency and / or their intensity.

Provided is a sound field control device configured to produce a listening area where a travel sound effect is audible and a quiet area in a sound field in a vehicle using a plurality of speakers. The sound field control device includes: a periodic waveform generator configured to generate different phase two periodic waveforms related to the travel sound effect based on the vehicle speed, and a sound field controller configured to, for each of the plurality of speakers, individually amplify and combine the different phase two periodic waveforms to generate a combined result using an SAN filter having coefficients set for the speaker based on locations of the listening area and the quiet area and feed the combined result to the speaker.