260 results about "Frequency response" patented technology

A switching regulator has a switching power stage circuit having a power switch coupled between an input terminal and a switch node, an output filter coupled between the switch node and an output terminal, and a feedback circuit. The power switch is controlled based on a feedback signal indicative of an output voltage. The output filter comprises a first filtering inductor, a second filtering inductor coupled in series between the switch node and the output terminal, and a first compensation network placed between the first filtering inductor and the second filtering inductor to alter the frequency response of the output filter. The feedback circuit is coupled to the output terminal to provide the feedback signal based on the output voltage.

This invention relates to a method for measuring the stability margin of a constant-temperature hot-wire anemometer based on in-situ open-loop frequency characteristics, belonging to the field of fluid measurement and automatic control technology. The method disclosed in this invention includes the following steps: S1. Connecting an ultra-low frequency low-pass filter to the closed-loop circuit to form an in-situ open-loop system with a DC closed loop and an AC open loop; S2. Injecting a sweep frequency excitation signal E at the bias circuit. stimu And measure the output response E of the amplifier circuit. a By comparing the amplitude ratio and phase difference of the two, the open-loop frequency response G of the system under actual operating conditions of the hot wire is obtained. open (jω); S3. According to G open (jω) Obtain the phase margin of the system and determine its stability. This invention proposes a new method for measuring the stability margin of a constant-temperature hot-wire anemometer, transforming the complex system stability problem into a measurable and analyzable open-loop frequency characteristic stability margin problem, providing a direct and reliable engineering basis for the circuit design of constant-temperature hot-wire anemometers.

The application discloses an audio effect evaluation method and device, equipment and a storage medium. The application inputs a preset reference sound source into an audio device to be tested for playing, wherein the preset reference sound source is a sound source determined by statistical analysis of sound sources, in combination with a parameter corrected according to a preset evaluation result and a peak factor corresponding to a music playing platform; collects audio to be tested output by the audio device to be tested when playing the preset reference sound source; determines a relative frequency response and an estimated loudness value according to a spectrum corresponding to the audio to be tested and a spectrum corresponding to the preset reference sound source; and generates an audio effect evaluation result of the audio device to be tested according to the relative frequency response and the estimated loudness value. The application evaluates the audio effect of the audio device to be tested by using the reference sound source constructed in advance, solves the problem of traditional sweep frequency signal tuning deviation, greatly reduces the number of repeated trial and error, and significantly improves the efficiency, accuracy and reliability of audio product tuning work.

This invention relates to the field of electronic measurement technology and discloses an online measurement method and system for the quality factor of resonant circuits. The method involves injecting a small-amplitude sinusoidal disturbance signal into the excitation end of the resonant circuit under test using weak electromagnetic coupling, extracting the amplitude and phase of the disturbance response using lock-in amplification technology, performing Lorentz fitting on the frequency response curve to calculate the negative 3 dB bandwidth, outputting the quality factor in real time from the ratio of the resonant frequency to the bandwidth, introducing cross-correlation narrowband filtering to compress the equivalent noise bandwidth to below 1 Hz, and having an automatic resonant frequency tracking function.

The application discloses a lightning impulse grounding grid frequency characteristic analysis method, system, device and medium, including: obtaining initial sample data; using the sample and a preset test frequency set to construct at least two different structure rational function interpolation models, and calculating the output residual thereof in the test frequency band; determining the target frequency point with the maximum modeling uncertainty according to the residual, calling the moment method to supplement high-precision response samples at the point; based on the updated sample set, constructing a diagonal or near-diagonal form rational interpolation model, and judging whether the prediction error of the model at the target frequency point is lower than a preset convergence threshold; if the convergence condition is not met, returning to the multiple model construction step, reiterating using the current sample set until the error meets the standard, and finally outputting the grounding grid frequency response characteristics covering the lightning impulse frequency band. The application realizes efficient analysis of the grounding grid frequency characteristics under lightning impulse, and effectively reduces the time used for analyzing the grounding grid frequency characteristics under lightning impulse.

This invention relates to the field of wind tunnel aerodynamic measurement technology for hypersonic vehicles, and discloses a method for evaluating and optimizing the dynamic load testing accuracy of a wind tunnel force measurement system. The evaluation method involves: equating the force measurement system to a multi-degree-of-freedom spring and mass model; constructing a dynamic differential equation and performing a Laplace transform; then, combining the dynamic stiffness matrix to construct a frequency response function matrix; defining the output of the force measurement channel of a rod-type strain balance and solving for the transfer function from the excitation point to the force measurement channel; combining the reference transfer function and the actual load, calculating the identified load and performing a Fourier transform to obtain the relative identification error of the force measurement system at the excitation point; finally, calculating the power spectrum weighted average identification error at the excitation point and comparing it with the engineering allowable error to determine whether the system has undergone stiffness optimization. This invention not only accurately identifies the dynamic load of the force measurement system but also achieves stiffness optimization, improving the accuracy of unsteady aerodynamic force measurement.

The application provides a wind power frequency modulation droop coefficient correction method and system considering the influence of delay characteristics, establishes a system frequency response model considering wind power frequency modulation delay characteristics and speed recovery control, obtains a system transfer function through the system frequency response model, and obtains system frequency key indexes through analytical solution; analyzes the influence mechanism of the delay characteristics on the power grid frequency dynamics, determines the relationship between each key index and the delay; on the basis of the relationship result, the droop control coefficient is corrected, so that the system frequency minimum point meets the preset requirement. The application can effectively improve the system frequency minimum point, so that the system frequency minimum point is consistent with that when the delay characteristics are not considered.

This invention discloses a method and system for measuring the frequency response of an electro-optic modulator based on a spectral analyzer. The system includes a laser, a 95:5 single-mode fiber splitter, an optical power meter, an electro-optic modulator, a control power supply, an RF signal generator, and a spectral analyzer. The measurement method includes the following steps: calculating a calibration factor to correct optical power drift through optical path splitting, driving the modulator by applying several discrete single-frequency RF points, and measuring the carrier power P0(f) using the spectral analyzer. i ) and the first-order sideband power P1(f i ), and determined by the power ratio R(f) i )=10 (P1‑P0) / 10 Combining the Jacobi–Anger expansion / Bessel function relation, the phase modulation index β(f) is solved by inverse solution. i Then, the phase transfer function H(f) at each frequency point is calculated and fitted. i The continuous frequency response S of the modulator is obtained. 21 This invention simplifies the testing process, reduces reliance on high-speed photodetectors and vector network analyzers, and enables high-precision electro-optic response testing of electro-optic modulators at high frequencies.

This invention discloses a primary frequency regulation optimization control method for new energy systems that considers the State of Energy (SOC) of energy storage. It overcomes the problem that traditional wind power control parameter tuning often relies on empirical formulas and fails to fully consider the dynamic changes in energy storage SOC. This method analyzes the power frequency characteristics of the grid-connected system and constructs a grid-connected frequency control model. Based on the high and low operating ranges of the energy storage SOC, it divides the system into correction coefficients and power allocation weights, calculates the total demand power based on frequency deviation, and allocates it to the wind turbine and energy storage system, establishing an adaptive frequency regulation power allocation strategy. A multi-objective function is constructed with the goals of minimizing frequency deviation, SOC fluctuation, and energy storage losses. An improved fuzzy neural network-deep reinforcement learning algorithm is used to identify operating conditions and iteratively correct control parameters, forming a closed-loop optimization to adapt to multiple operating conditions. This invention improves the frequency response speed and regulation margin of wind power under complex operating conditions while also considering energy storage lifespan, achieving synergistic optimization of frequency regulation performance and energy storage economy.

This invention proposes a hysteresis compensation control method for high-speed switching valves based on PWM, belonging to the field of high-speed switching valve control. Its key feature is that the working cycle of the high-speed switching valve is divided into four stages. The rising and falling edges of the reference PWM control the opening and closing times of the high-speed switching valve, while the loading signal consists of on-compensation PWM, excitation PWM, opening-hold PWM, and closing compensation PWM. By varying the pressure before the valve, the critical voltage values ​​for opening and closing the valve core are obtained, thereby controlling the amplitudes of the on-compensation PWM and opening-hold PWM to reduce the hysteresis time and current consumption of the valve core response. The duty cycle of the excitation PWM is determined by the derivative of the pressure before the valve, and the duty cycles of the on-compensation PWM and closing compensation PWM are obtained based on the coil current, accelerating the valve core response speed and optimizing current consumption. This invention can improve the response speed of high-speed switching valves, reduce energy consumption, and expand the frequency response range, offering advantages such as high response, low power consumption, low cost, and small footprint.

The application relates to a self-enclosed self-adaptive amplitude equalizer. The equalizer comprises an equalization circuit, a tuning branch one and a tuning branch two adopting an electric tuning topological structure, the resistance values of the tuning branch one and the tuning branch two are adjusted to realize continuous slope adjustment of-10 dB to +10 dB in a 300 MHz to 1200 MHz frequency band; a main transmission circuit, an input end RFin and an output end RFout of which are respectively used as an input end and an output end of the equalizer; and the outputs of the tuning branch one and the tuning branch two are connected to a fusion node A on the main transmission circuit; a data acquisition and operation circuit, temperature and amplitude-frequency response data are collected in real time through an MCU microcontroller, and a pre-stored temperature-frequency-compensation lookup table and an aging model are combined to calculate a compensation control signal. The equalization circuit slope is adjusted through SPI control of a digital potentiometer and a varactor, and closed-loop self-correction is realized without manual intervention.

The application relates to an inter-axis coupling suppression method and device, wherein the inter-axis coupling suppression method comprises the following steps: after a preset high-frequency modulation field is applied to a first measurement axis and a second measurement axis of an atomic magnetometer, a first excitation strategy and a second excitation strategy of the atomic magnetometer are independently executed respectively, and execution results of the excitation strategies are analyzed to obtain a first frequency response and a second frequency response; a coupling matrix is determined based on the first frequency response and the second frequency response; a decoupling filter matrix corresponding to the coupling matrix is determined and is converted into time-domain filter coefficients; when the atomic magnetometer performs actual double-axis measurement, a first actual measurement signal corresponding to the first measurement axis and a second actual measurement signal corresponding to the second measurement axis are acquired in real time, and the first actual measurement signal and the second actual measurement signal are decoupled based on the time-domain filter coefficients to obtain a first decoupled signal and a second decoupled signal. Through the application, the problem that the measurement accuracy of the magnetometer is low is solved.

Systems and techniques are provided for processing audio data. For example, a process can include determining audio context information corresponding to a multi-band bone conduction microphone (BCM), wherein the audio context information is indicative of at least one of noise information or voice information. A process can include generating a control signal indicative of a resonance configuration for one or more resonators of a plurality of resonators included in the multi-band BCM, wherein the resonance configuration is based on the audio context information and corresponds to one or more frequency response adjustments. A process can include transmitting the control signal to the multi-band BCM, wherein the control signal is configured to cause the multi-band BCM to generate a BCM output signal using the resonance configuration.

The application relates to a wind turbine frequency modulation method, and belongs to the technical field of wind power generation. The method comprises the following steps: obtaining a real-time operation condition of a wind turbine, and calculating maximum available frequency modulation energy of the wind turbine; dividing a whole frequency modulation process under power system power disturbance into time periods, and constructing a power system frequency response analysis model corresponding to each time period; calculating a corresponding relationship between a frequency minimum point and frequency modulation consumed energy of the whole frequency modulation process based on the power system frequency response analysis model; constructing an optimization model of frequency modulation control parameters, taking the maximum frequency minimum point as an objective function and taking the constraint condition that the frequency modulation consumed energy does not exceed the maximum available frequency modulation energy; solving the optimization model to obtain optimal wind turbine frequency modulation control parameters, and performing frequency modulation control on the wind turbine based on the frequency modulation control parameters. The wind turbine frequency modulation method can effectively improve the system frequency minimum point under power disturbance and optimize the wind power frequency modulation control effect.

The present invention discloses a method for identifying nonlinear parameters of structural clearances. First, a mathematical model of the structural clearance nonlinear system is established; then, the frequency response function of the system under sinusoidal sweep excitation is obtained through the input-output response of the system; in the frequency response function, a pair of symmetric displacement points exist at any displacement response amplitude to define the same displacement frequency response function. By defining the real and imaginary parts of the displacement frequency response function through the symmetric displacement FRF points at each given displacement response amplitude, the natural frequency of the system related to the displacement response amplitude can be obtained; then, the expression of the nonlinear equivalent stiffness of the system is extracted through the simulation analysis of the model, and the equivalent stiffness curve of the system is further obtained through the model simulation data; finally, based on the particle swarm algorithm, the clearance characteristic parameters are obtained by curve fitting according to the equivalent stiffness expression obtained by integration and the equivalent stiffness curve obtained by model simulation; the present invention can identify the clearance nonlinear parameters more quickly and accurately globally.

This invention relates to the field of coordinated control of energy storage in new energy collection stations, and particularly to a coordinated control method for reactive power compensation of energy storage in new energy collection stations based on impedance reshaping. Based on the acquired three-phase AC signal, an analytical signal representation is obtained. Based on the analytical signal representation, a complex spectrum is obtained, and the impedance frequency response is determined. After processing with an exponentially weighted cumulative average filter, the actual impedance is obtained. Combined with the target impedance determined by the target impedance response model, the impedance error is determined. Based on the impedance error, a frequency-sensitive adjustment driving function is determined, and a new energy collection station adjustment residual loss function is constructed. The optimal complex impedance weighted path scheduling matrix is ​​determined. Simultaneously, a frequency segmentation objective function mechanism and a suppression function are introduced to construct a global optimization objective function, obtaining the optimal virtual impedance configuration. This solves the technical problems of resonance and stability issues, as well as reactive power response conflicts and low control efficiency caused by independent control strategies and a lack of coordinated adjustment.

This invention provides a method for assessing the safe domain of diesel generator load fluctuations based on frequency sweep identification, belonging to the field of operational safety assessment. Under the steady-state operation of the diesel generator, a small-amplitude frequency sweep power disturbance that does not change its steady-state operating point is applied to the generator, and the frequency sweep power disturbance signal and the corresponding frequency deviation response signal are simultaneously acquired. Based on the frequency sweep power disturbance signal and the frequency deviation response signal, a general frequency response function for the power-frequency channel, independent of the internal structure and control parameters of the diesel generator, is obtained through frequency domain identification. The load fluctuation signal to be assessed is acquired, converted to the frequency domain to obtain the load disturbance spectrum, and a predicted frequency deviation spectrum is obtained. The time-domain frequency deviation response of the diesel generator under the action of the load fluctuation signal is reconstructed. The maximum frequency deviation and the maximum frequency change rate are extracted and compared with the corresponding preset safety thresholds to determine whether the load fluctuation is within the safe domain of the diesel generator.

The application discloses a decision feedback equalizer for PAM4 encoding band infinite impulse response filter, belongs to the field of signal processing, and comprises a high-pass filter and a linear equalizer, a decision feedback adder, and an infinite impulse response filter coefficient feedback control module; noise filtering is performed on a high-speed signal, low-frequency attenuation of the high-speed signal is compensated, a tailing effect in a frequency response is eliminated, high-speed inter-symbol interference is suppressed and eliminated, and an offline post-cursor in the frequency response is fed back and compensated; meanwhile, aiming at PAM4 encoded data, an RLM (Level separation mismatch ratio) calibration module and a clock data recovery circuit are added, which are used for improving the speed of clock receiving and recovery, and due to the addition of more high-speed modules, the load of the equalization adder is increased; the application uses a layout planning of a double-difference six-port mutual inductance bridge type (T-coil) inductive network, and bandwidth is expanded by using inductive peaking technology.

Tension control system for a fastener in an assembly and associated control method. The present invention relates to a tension control system (10) for a fastener (12) in an assembly (36), said fastener (12) comprising a rod (14) and an assembly member (16), the control system (10) comprising: - a first measuring device (44), the first measuring device (44) being adapted to measure a first parameter representative of the time response of the rod (14) to an ultrasonic excitation, - a second measuring device (46) adapted to measure a second parameter representative of the frequency response of the rod (14) to an ultrasonic excitation, and - a calculator (48), the calculator (48) being adapted to determine a value of the tension of the rod (14) as a function of at least said first parameter and said second parameter. Figure for the abstract: Figure 1

The application discloses a gate self-vibration frequency considering bottom seal water leakage flow excitation vibration resonance judgment method and device. The method obtains a flow field agent excitation signal of a to-be-measured structure under a preset fluid boundary condition and a vibration response signal synchronously collected; an excitation main frequency and a corresponding excitation initial phase are extracted based on the flow field agent excitation signal; a same-frequency response phase is extracted from the vibration response signal based on the excitation main frequency; an excitation response phase difference between the same-frequency response phase and the excitation initial phase is calculated, and the excitation response phase difference is mapped to a preset main value interval to obtain a normalized phase difference; finally, the normalized phase difference is compared with a preset theoretical resonance phase difference to determine whether resonance occurs. The application avoids the interference of a contact type sensor on a slit flow field and the damping sensitivity defect of traditional amplitude judgment, and realizes high-precision automatic positioning of a resonance critical point under a complex fluid-solid coupling working condition.

This invention discloses a bandpass frequency-selective surface structure based on strongly coupled pairs, composed of multiple basic structural units. Each basic structural unit has a vertically symmetrical structure along its thickness direction. Both the upper and lower symmetrical portions include a first metal layer and a first dielectric layer in symmetrical positions. The first metal layer contains a first resonator pair, a second resonator pair, and a third resonator pair, each using metal patches as resonators. A second metal layer and a second dielectric layer, separated along the thickness direction of the basic structural unit and in asymmetrical positions, are disposed between the upper and lower symmetrical portions. The upper and lower symmetrical portions are connected by metal conductive posts. This invention operates stably at a center frequency of 5 GHz, introduces four transmission zeros, achieves a fourth-order frequency response within 8.4% of the relative bandwidth, has an insertion loss of less than 0.49 dB, and 40° angular stability, exhibiting superior performance.

The application discloses a power system frequency safety constraint scheduling method considering variable parameter characteristics of thermal power generating units, belongs to the field of power system optimal scheduling and frequency safety analysis, and considers the characteristics that the frequency response capability of a TPU changes with operating power, thereby avoiding an aggressive and unrealistic scheduling scheme caused by excessively optimistic assumptions on the PFR capability of the TPU; meanwhile, the method considers frequency safety indexes under positive and negative bidirectional power disturbances, reasonably constrains the frequency safety indexes under potential positive and negative power disturbances, guarantees the ability of the system to resist frequency fluctuation under random disturbance events, avoids overestimation of the performance of the system under conventional rating assumptions, thereby reduces decision risks, and guarantees the frequency safety of power system operation.

This invention provides an analytical method for a two-zone frequency full response model considering nonlinear elements, belonging to the field of analytical analysis of power system frequency response. First, considering the influence of nonlinear elements, a single-machine frequency full response model considering nonlinear elements is established. A piecewise modeling method for nonlinear elements and a full response analysis theory are proposed to achieve analytical analysis. Second, considering the influence of frequency spatiotemporal distribution characteristics, a two-zone equivalent frequency response model is established. An analytical method based on the model's vibration equation is proposed to achieve analytical analysis of regional frequencies. Finally, a two-zone frequency full response model considering nonlinear elements is established to achieve dynamic analytical characterization of the system's frequency response. This invention improves the accuracy of the model's description of the dynamic frequency characteristics of power systems after large disturbances, providing a new approach to solving the frequency security problem of power systems under the coupled influence of nonlinear elements and frequency spatiotemporal distribution characteristics, and contributing to the safe and stable operation of power systems.

The application provides a spatial response compensation method and device, electronic equipment and a storage medium. The spatial response compensation method comprises the following steps: constructing a spatial transfer function according to spatial input information and corresponding spatial response information of a system; splitting the spatial transfer function into a minimum phase system and an all-pass system; determining a first inverse system corresponding to the minimum phase system and a second inverse system corresponding to the all-pass system; constructing a compensation system according to a preset target frequency response, the first inverse system and the second inverse system; compensating the spatial transfer function through the compensation system to obtain a compensated spatial transfer function; and converting the spatial input information of the system into target spatial response information through the compensated spatial transfer function. The application decomposes an arbitrary stable and causal linear time-invariant system into a minimum phase system and an all-pass system with different properties, and solves the inverse systems of the two systems, thereby reducing the complexity of the solution.

The present application relates to a kind of all-weather power grid equipment abnormal sound monitoring device and its sound source positioning method, belong to the technical field of power equipment online monitoring and fault diagnosis.The device includes: multiple microphone units, each microphone unit includes microphone body and the e-PTFE sound-permeable film covered on its surface, for efficiently permeating sound wave while blocking wind and rain erosion;Multiple three-legged stand poles with water-blocking umbrella covers, at least one microphone unit is arranged on each stand pole, and is distributed around the power grid equipment to be monitored;Data processing unit;And solar power supply module and protection cabin.The method includes: setting loudspeaker array at the suspected abnormal sound source position, using exponential sine sweep method to measure the frequency response function matrix of loudspeaker to microphone unit;After removing the loudspeaker, based on the measured frequency response function matrix and the sound pressure signal collected in real time, the abnormal sound source signal is extracted and the path contribution is calculated using the transfer path analysis method based on regularization.

The application discloses a waveform design method based on underwater acoustic energy and communication transmission, comprising the following steps: constructing an underwater acoustic energy and communication transmission system model; fitting the gain curve of an acoustic-electric transducer; analyzing the energy collection and communication performance of underwater acoustic energy and communication transmission; jointly optimizing the transmission waveform and power splitting factor with the maximum energy collection as the target; fitting the frequency response curve of the transducer based on measured data, and accurately depicting the frequency-dependent energy conversion efficiency; by introducing a nonlinear rectifier model, the high peak-to-average ratio characteristics of the multi-carrier waveform can be fully utilized to significantly improve the direct current output power of the rectifier circuit; in the whole transmission process, the power splitting factor and the beamforming vector are adjusted through the joint optimization algorithm, the minimum rate requirement of the underwater communication link is strictly guaranteed, and the energy transmission efficiency is maximized; the problem of inaccurate performance prediction and low efficiency of the simplified model in the actual underwater environment is effectively solved, and the energy self-sustaining ability of the underwater Internet of Things node is significantly improved.

The application relates to the field of air conditioning regulation technology and discloses an air conditioning unit energy-saving operation regulation control system based on meteorological fluctuation prediction, which comprises a building heat response delay module, a pipe network residual cold quantity monitoring module, a variable frequency response phase control module and a meteorological mutation forced switching module. The building heat response delay module corrects a meteorological prediction disturbance curve according to a heat response delay parameter set. The pipe network residual cold quantity monitoring module determines the transient residual cold quantity accumulated in the chilled water pipe network. The variable frequency response phase control module calculates a physical delay span according to the corrected frequency modulation instruction and the transient residual cold quantity, and adjusts the action phase of the compressor. The meteorological mutation forced switching module monitors the outdoor temperature change rate to determine whether to suspend the delay state. According to the phase compensation of the meteorological disturbance and the quantitative utilization of the pipe network thermal inertia, the time deviation between the cold quantity supply and the building heat load demand is eliminated, and the unit operation oscillation is improved.

This application relates to a transimpedance amplifier circuit, comprising a front-end amplifier that receives an input current and outputs a corresponding voltage, and a processing stage configured to process the voltage output from the front-end amplifier. The application also relates to an amplifier circuit where the processing stage has a filter having a frequency response with a local minimum. The transimpedance amplifier circuit can be used to process signals including data within a data band, and the filter can be configured such that the local minimum occurs within that data band. The filter response at least partially compensates for resonance peaks in the frequency response of the front-end amplifier caused by anticipated resonance at the input of the front-end amplifier.