43 results about "Amplitude function" patented technology

The invention relates to a method and an apparatus for measuring the thickness of a transparent film by broad band interferometry, comprising the steps of preparing a correlogram of the film by an interferometer, applying a Fourier transformation to said correlogram to obtain a Fourier phase function, removing a linear component thereof, applying a second integral transformation to the remaining non-linear component to obtain an integral amplitude function of said non-linear component, identifying the peak location of said integral amplitude function and determining the thickness of the film as the double value of the abscissa at said peak location considering a refractive index of a film which is dependent on wavelength. The last two steps may be replaced by identifying the peak locations of said integral amplitude function and determining the thickness of the films as the double values of the abscissas at the peak locations.

The invention discloses a control rod worth measuring method for a WWER (water-water energetic reactor) hexagonal lattice core, comprising a test process and a correction factor calculating process; the test process employs an existing dynamic rod worth measurement method, and a specific process is detailed; the correction factor calculating process employs an AFCF (amplitude function conversion factor) to correct a detector signal R, calculates to obtain dynamic measurement reactivity, and employs an RCF (reactivity conversion factor) to correct the dynamic measurement reactivity to obtain measurement rod unit worth; the method saves time and has high measurement precision.

The invention discloses a signal amplitude sequence based radio frequency fingerprint feature extraction and identification method. The method includes to detect the locations of initial point and ending point of the received boot transient signal, to collect the boot transient signal sample points, to number the boot transient signal sample points and definite the amplitude functions of the boot transient signal sample points according to the corresponding amplitude of each boot transient signal sample points, to measure the size of the boot transient signal sample points and handle accordingly, to build a sample vector function fingerprint database and an unidentified sample vector function database, to build a between-class dispersion matrix and calculate the trace, and to identify whether the two wireless transmitters are same device. The fingerprint acquisition and feature extraction method is simple and efficient and has general applicability. Meanwhile, by applying the method, the identification rate is obviously improved on the basis of controlling the computing complexity.

The invention discloses a multi-physical coupling method in transient calculation of a pressurized water reactor. The method comprises the following steps of 1, for a multi-group space-time neutron kinetics equation, obtaining neutron-flux density and delayed-neutron precursor density of a prediction step by using a fully-implicit backward difference method; 2, obtaining a shape function of the prediction step through a normalization condition, linearly interpolating the shape function in a medium time step, and by solving an amplitude function equation on a small time step, finally obtaining neutron-flux density on the medium time step, thereby obtaining power and delayed-neutron precursor density; and 3, performing fuel temperature calculation and coolant temperature calculation through the power in the medium time step, realizing feedback through a nuclear reaction cross section, and realizing coupling with neutronics calculation. When the neutronics calculation is performed by using an improved quasi-static method of prediction and correction, heat engineering calculation and delayed-neutron precursor density calculation are performed on the proper time step to realize efficient coupling.

A method implemented in a system of signal processing for phase-amplitude coupling (PAC) and amplitude-amplitude coupling (AAC), wherein comprises: decomposing a non-stationary signal by an ensemble empirical mode decomposition (EEMD) into a plurality of intrinsic mode functions (IMFs), receiving a phase function and an amplitude function from the IMFs, then comparing the phase function with the amplitude function on a time domain to generate a plurality of scattering plots. Further more, multiplying the scattering plots by the modulation index to generate a frequency spectrum. The following information will be illustrated the different part of PAC and AAC.

This invention discloses a property test desk for FM variable amplitude car hangers, which fixes two same sets of exciting desks with FM and variable amplitude function at either end of a straight frame oppositely and the axes of two rotation mandrels contained in the exciting desks share one, the function is realized by the frequency adjust device and the amplitude regulation device, the car protection device is fixed on the base located above two vibration rest frames in the vibration maintenance and a guiding unit and below the vibration board, which realizes the active vibration of right and left exciting desks.

This invention discloses a method and a plurality of compressive amplitude distortion units for enhancing the perceptibility of the low-frequency portion of a sound by introducing residue harmonics of low-frequency signal components into the sound, where the residue harmonics are generated by a nonlinear function emulating the middle-ear response of a human being. The low-frequency portion in the resultant sound is perceivable to a human listener even if this portion is removed from this sound. In one embodiment, a compressive amplitude distortion unit comprises: a low pass filter for extracting low-frequency components of the input sound signal; a compressive amplitude function processor for generating a harmonics-containing signal from the low-pass signal by a nonlinear function emulating the middle-ear response; a gain block for scaling the harmonics-containing signal such that the signal strength of the scaled harmonics-containing signal is in the same range as that of the initial low-pass signal; an adder for adding the input sound signal and the scaled harmonics-containing signal; and a high pass filter for removing the low-frequency signal components in the output sound signal while still including the residue harmonics. Based on the disclosed method, this invention also discloses two anti-piracy methods that utilize the absence of low-frequency signal components in a sound signal, one for convenient detection of an unauthorized copy of the processed sound signal, another one for discouraging people to make such an unauthorized copy.

The invention discloses an intelligent frequency and amplitude modulation rolling method for a vibratory roller, which comprises the following steps, step 1: obtaining the optimal vibration compactionparameters of a roadbed packing room through laboratory tests; step 2: determining the vibration response characteristics of a soil system of the vibratory roller; step 3: collecting the running state of vibration wheels in the compaction process through tests and analyzing the data; step 4: according to the criterion of a vibration compaction mode, determining the working parameters of the roller; step 5: adjusting the vibration parameters of the roller to the matching optimal working parameters by the roller with an electrodeless variable frequency and amplitude function and uploading the rolling data to the intelligent compaction control platform for further deep learning and feedback. Based on the vibration response characteristics of the roller and the judgment criterion of the optimal working parameters, the intelligent frequency and amplitude modulation rolling method for the vibratory roller automatically adjusts the vibration parameters of the roller to the matching optimal working parameters according to the compaction state of the roadbed filling, and develops a prototype to achieve the intelligence and high efficiency rolling of the roadbed filling.

The invention provides an ultra-short chirped pulse time domain phase and frequency domain phase measurement method and system. The method comprises steps of S1, measuring the amplitude functions of the actual time domain signal and the frequency domain signal of the to-be-measured pulse; S2, determining the first order linear chirp coefficient and the high order nonlinear chirp coefficient in the time domain and frequency domain by dichotomy; and S3, determining the chirp coefficient of each order by the iterative method to obtain the time domain phase and the frequency domain phase of the pulse. The time domain strength waveform information and the spectral intensity information of the pulse are measured and the iterative algorithm is used to determine the chirp coefficient of each order, the complex interference optical path is not required, and the instrument of directly measuring the phase is not required. Only the time domain strength waveform information and the spectral intensity information of the pulse are needed to be measured, and the linear chirp coefficient and the high order nonlinear chirp coefficient of the time domain and the frequency domain can be measured at the same time.

A system and method for activating electrodes in an implanted electrode array with a stimulation signal is described. A stimulation definition stage, for each of a plurality of defined sound signal characteristics (C), assigns each electrode to one of a plurality of stimulation groups (G) each having an associated group stimulation amplitude function (A), where (G) varies with (C). An electrode stimulator activates each electrode as the stimulation signal varies based on spectral components of the stimulation signal.

The invention discloses a method monitoring fatigue service life of a crane beam; the method comprises the following steps: recording position information of the crane beam; setting position information of fatigue checking computation points for the crane beam; setting up a corresponding stress amplitude function for each the fatigue checking computation point of the crane beam, wherein the stress amplitude function uses hoisting weight and walking position as input variables; using the corresponding stress amplitude function to calculate a stress amplitude formed on the fatigue checking computation point by a hoisting object in each walking process of the crane beam; converting the stress amplitude of the fatigue checking computation point of the crane beam into a stress amplitude cycle index indicating fatigue life. The method can monitor the fatigue service life of the crane beam without needing a stress induction sheet, so monitoring cost and construction difficulty cannot be obviously improved by increasing number of the crane beams and fatigue checking computation points.

The invention provides an ultrasonic torsional vibration measuring device. The ultrasonic torsional vibration measuring device includes an ultrasonic power supply, an amplitude-change pole, a computer, a display device, a first bracket, a second bracket and a third bracket; a transducer is arranged on the first bracket, the upper end of the transducer is connected with the lower end of the amplitude-change pole through a double-end bolt, and the upper end of the amplitude-change pole is provided with a standard knife rod; a laser displacement sensor pan-tile is arranged on the second bracket, and a laser displacement sensor is arranged on the laser displacement sensor pan-tile. The invention further discloses a measuring method of the ultrasonic torsional vibration measuring device. By fitting a torsional amplitude function curve, the torsional vibration amplitude of each point on the knife rod can be simply calculated, and quantization of the torsional vibration amplitude of an edge of one, participating in cutting, of a milling cutter, a drill and other cutter tools is achieved. Through the torsional amplitude of an ultrasonic vibration device, the torsional vibration amplitude of a cutting edge or a point of a small-diameter cutter tool can be calculated.

The invention relates to a method and an apparatus for measuring the thickness of a transparent film by broad band interferometry, comprising the steps of preparing a correlogram of the film by an interferometer, applying a Fourier transformation to said correlogram to obtain a Fourier phase function, removing a linear component thereof, applying a second integral transformation to the remaining non-linear component to obtain an integral amplitude function of said non-linear component, identifying the peak location of said integral amplitude function and determining the thickness of the film as the double value of the abscissa at said peak location considering a refractive index of a film which is dependent on wavelength. The last two steps may be replaced by identifying the peak locations of said integral amplitude function and determining the thickness of the films as the double values of the abscissas at the peak locations.

A multi-layer, multi-frequency and multi-amplitude vibration mesh grading screen relates to an industrial grading screen, in particular to a multi-layer, multi-frequency and multi-amplitude vibration mesh grading screen. The grading screen is composed of a vibration screen support (1), a plurality of screen meshes (2), a plurality of vibration devices (3) and a plurality of connecting springs (4), wherein a plurality of screen meshes form a screen mesh layer and are lowered in sequence; both sides of each screen mesh are connected with the connecting springs; the other end of each connecting spring is fixed on the vibration screen support; the vibration devices are respectively arranged on the lower surface of each screen mesh. The grading screen has multi-layer, multi-frequency and multi-amplitude functions, and has the advantages of large processing capacity, strong adaptive capacity, high sieving efficiency, low energy consumption, light complete machine weight, convenient maintenance, low operating noise and good dustproof performance.

The invention discloses a dynamic attack angle amplitude limiting method for reducing missile body overload when aerodynamic configuration changes. The method dynamically limits the amplitude the attack angle of the missile in order to reduce missile body overload when aerodynamic configuration changes. The method for dynamically limiting the amplitude of the attack angle of the missile comprises: S1, computing a maximum attack angle amplitude value of the missile in a before-separation stable process and a after-separation stable process and a maximum attack angle amplitude value of the missile when aerodynamic configuration changes, and variation ranges of the attack angle and the flight speed of the missile; S2, determining a attack angle limiting amplitude function varying with the flight speed of the missile; S3, determining a function relationship between a maximum lift coefficient, attack angle limiting amplitude value, and the flight speed; and S4, acquiring the reference area and the mass of the missile, the flight dynamic pressure, the flight speed, and the trajectory inclination angle of the missile at the current time so as to determine the upper limit value and the lower limit value of a overload amplitude limiter at a current time. The method may determine an optimum attack angle limiting amplitude value according to the real-time flight state of the missile and reduce missile body overload when aerodynamic configuration changes.

The invention discloses a method for measuring dynamic stiffness of a flywheel bearing. The method is characterized by comprising the following steps of installing a flywheel to be tested on a micro-vibration test platform, driving the flywheel to the maximum rotating speed and then carrying out inertial parking, and acquiring a three-way disturbing force signal in the entire operating state through an acquisition system; performing fast Fourier transform on an acquired time domain signal, drawing a flywheel three-way rotating speed spectrogram, and extracting the radial translation frequencyand the axial translation frequency of a rotor through the amplitude; respectively extracting high-order harmonic amplitude data resonated and amplified with radial and axial translational modals on x-direction and z-direction rotating speed spectrograms, and fitting the data to obtain a radial damping coefficient and an axial damping coefficient according to an amplitude function; and calculatingto obtain the radial dynamic stiffness and the axial dynamic stiffness of the flywheel bearing. According to the method for measuring dynamic stiffness of a flywheel bearing provided by the invention, dismounting and destruction of the structure can be avoided by adopting indirect measurement, and the method has the beneficial effects of being simple in calculation, non-invasive, and real-time and visual in results.

The invention discloses a method for recognizing tidal mixing frontal surface with satellite altimeter along-track data.A non-dimensional momentum equation is obtained through dimensional analysis according to satellite altimeter 20 Hz along-track data, on the sea surface, the second vertical gradient of tidal stress is neglected, the momentum equation obtained in step 1 is subjected to integral from the shore side A to the offshore side B of the frontal surface to obtain an sea surface height SSH, the obtained sea surface height is subjected to EMD decomposition to obtain a series of IMF components, an HHT method is applied to each IMF component, amplitude functions and phase functions of the IMF components are utilized to represent the obtained sea surface height, and therefore the sea surface height is converted to be an Hilbert spectrum equation, so that an Hilbert spectrum of the sea surface height is obtained.The HHT method is utilized to decompose the 20 Hz along-track data into the IMF components, and an SSH saltus step can be recognized clearly through the HHT method.

An image and video processing system and methods based on amplitude-modulation frequency-modulation (“AM-FM”) demodulation to provide high quality reconstructions, both visually and quantitatively. The system and methods reconstructs an image based on a Regularized Optimization (“RO”) of estimates to attain a small number of locally coherent components and simultaneously enforce a piecewise smooth constrain for one or more amplitude functions.

A method of performing a complex Fourier transform of an input function comprising amplitude and phase information, the method including the steps of: decomposing the input function into a plurality of sub-functions, wherein the Fourier transform of each sub-function comprises an amplitude function and a phase function in which the phase is constrained to a plurality of possible phase values; determining the phase function of the Fourier transform of each sub-function by measuring the amplitude function of an optical Fourier transform of the sub-function and changes in the amplitude function of the optical Fourier transform caused by applying a perturbation function to the sub-function; and combining the determined phase functions and the measured amplitude functions for each sub-functionto form the complex Fourier transform of the input function.

The invention discloses an adaptive adjustment method for the scanning mode of radar at a passive working mode. The adaptive adjustment method comprises the steps of building an EDW (Entity Description Word) angle-amplitude function by taking intercepted EDW angle data of a target radiation source as an independent variable and taking intercepted EDW amplitude data of the target radiation source as a dependent variable, and fitting an angle and an amplitude in target EDW data, which is outputted by a data processor, in the current scanning period; integrating the built EDW angle-amplitude function in different angle areas, and recording an integrating result and a corresponding integrating area; estimating an expected value according to the EDW angle and amplitude acquired in the current scanning period; and selecting an integrating area value corresponding to an EDW angle-amplitude function integrating result which is the closest to the expected value, and determining a sector-scan center and a sector-scan range according to the integrating area value. Through accumulation for intensity values of radiation intercepted by a key radiation source target in different angle ranges, the adaptive adjustment method can realize recognition for an area in which the target appears, thereby adaptively adjusting the sector-scan center and the sector-scan range of the radar.

This invention discloses a method and a plurality of compressive amplitude distortion units for enhancing the perceptibility of the low-frequency portion of a sound by introducing residue harmonics of low-frequency signal components into the sound, where the residue harmonics are generated by a nonlinear function emulating the middle-ear response of a human being. The low-frequency portion in the resultant sound is perceivable to a human listener even if this portion is removed from this sound. In one embodiment, a compressive amplitude distortion unit comprises: a low pass filter for extracting low-frequency components of the input sound signal; a compressive amplitude function processor for generating a harmonics-containing signal from the low-pass signal by a nonlinear function emulating the middle-ear response; a gain block for scaling the harmonics-containing signal such that the signal strength of the scaled harmonics-containing signal is in the same range as that of the initial low-pass signal; an adder for adding the input sound signal and the scaled harmonics-containing signal; and a high pass filter for removing the low-frequency signal components in the output sound signal while still including the residue harmonics. Based on the disclosed method, this invention also discloses two anti-piracy methods that utilize the absence of low-frequency signal components in a sound signal, one for convenient detection of an unauthorized copy of the processed sound signal, another one for discouraging people to make such an unauthorized copy.

The invention discloses a method monitoring fatigue service life of a crane beam; the method comprises the following steps: recording position information of the crane beam; setting position information of fatigue checking computation points for the crane beam; setting up a corresponding stress amplitude function for each the fatigue checking computation point of the crane beam, wherein the stress amplitude function uses hoisting weight and walking position as input variables; using the corresponding stress amplitude function to calculate a stress amplitude formed on the fatigue checking computation point by a hoisting object in each walking process of the crane beam; converting the stress amplitude of the fatigue checking computation point of the crane beam into a stress amplitude cycle index indicating fatigue life. The method can monitor the fatigue service life of the crane beam without needing a stress induction sheet, so monitoring cost and construction difficulty cannot be obviously improved by increasing number of the crane beams and fatigue checking computation points.

The invention relates to a method for eliminating an uplink signal noise in a GSM digital optical fiber repeater, the method comprises: converting a radiofrequency signal received by a repeating transmission aerial and sent by a mobile terminal into a first baseband signal comprising I(t) and Q(t), also comprises the following steps: taking out and processing the first baseband signal to obtain a first amplitude signal proportional to the first baseband signal amplitude function; delaying the first baseband signal; synthesizing the delayed first baseband signal and the first amplitude signal to obtain an second baseband signal of an optical signal for modulating and transmitting into a base station. The invention has beneficial effects: the noise of the apparatus provided by the invention can not be overlapped on a time slot in the carrier wave to transmit to the base station, thereby enabling the system performance to be better.

A tuning circuit having an amplitude-varying function is disclosed that comprises a coil, a capacitor, and a resistance-adjusting element connected in parallel to the coil and the capacitor for varying resistance at time of resonance of the tuning circuit, wherein the amplitude of an output signal of the tuning circuit is varied by varying the resistance with the resistance-adjusting element.