63 results about "Oscillation amplitude" patented technology

The invention provides a swing control method based on molten pool oscillation multi-feature fusion and related equipment, and relates to the technical field of welding, the method comprises the steps that in the argon arc welding process, an electric arc signal and a molten pool oscillation signal of a variable wall thickness welding area are collected in real time; oscillation amplitude, main frequency characteristics, current fluctuation coefficients and voltage-current phase difference characteristics are extracted from the molten pool oscillation signals and the electric arc signals and combined, and an oscillation comprehensive characteristic matrix is obtained; inputting the oscillation comprehensive characteristic matrix into a pre-trained classification model, and identifying a current molten pool state type; a corresponding swing compensation strategy is matched according to the state type of the molten pool, and asymmetric swing parameters are generated; and the asymmetric swing parameters and a preset basic welding track are subjected to superposition operation, and a composite control instruction is generated to control a welding gun to execute asymmetric swing welding. By implementing the method, different abnormal states of different molten pools can be subjected to differential control, and the stability of the variable-wall-thickness welding process and the forming quality of a final weld joint are improved.

The invention relates to the technical field of power systems, and particularly provides a network construction type energy storage wide and low frequency disturbance suppression method suitable for a weak power grid environment. The method comprises the following steps: constructing an equivalent impedance model, and analyzing RLC resonance impedance matching conditions; constructing a quantitative model of impedance dynamic correlation; designing a multi-parameter adaptive virtual impedance module; constructing a cooperative control architecture of the adaptive virtual impedance and the network construction type energy storage converter; through verification of a continuous voltage drop simulation scene, adaptive adjustment parameters are optimized by adopting indexes of oscillation amplitude attenuation rate and stabilization time so as to ensure a wide and low frequency disturbance suppression effect under a weak power grid, and according to the method, broadband oscillation suppression under the continuous voltage drop scene is realized through adaptive virtual impedance, and dynamic accurate compensation is realized.

The invention relates to the technical field of laser processing control, in particular to a laser energy and light spot swing cooperative control method and system for laser welding, and aims to solve the problems that in the prior art, when parameters are linearly adjusted, the hysteresis effect of heat input and the nonlinear coupling relation of energy density are ignored; therefore, incomplete fusion, over-burning and non-uniform fusion depth of a welding seam are easily caused. The method comprises the following steps: acquiring a weld gap width estimation value and a gap change rate at the current moment; determining the target swing amplitude of the light spot at the current moment; calculating a laser power instruction value at the current moment; and a swing frequency instruction at the current moment is calculated, and closed-loop control is conducted on the welding process in cooperation with the laser power instruction value and the target swing amplitude. According to the method, no matter how the swing amplitude changes, the effective heat flux density acting on the unit area of the weld joint is kept constant, and therefore the consistency of the penetration depth is guaranteed.

The invention provides an engine VVT clamping stagnation processing method and system, and the method comprises the steps: obtaining the static characteristics and dynamic response characteristics of an engine during operation, detecting the operation state of the engine VVT, and judging whether the VVT clamping stagnation exists or not; if VVT clamping stagnation does not exist, according to the set period, the oscillation amplitude and the oscillation frequency, a battery valve is driven to enable a VVT actuator to do reciprocating motion within the stroke range; if VVT clamping stagnation exists, a corresponding voltage compensation coefficient is obtained according to the real-time storage battery voltage, and oscillation is performed by adopting a strong oscillation mode or a limit position recovery mode based on the voltage compensation coefficient; and detecting the triggering times of oscillation, judging whether the VVT clamping stagnation is solved or not when the triggering times reach a triggering times threshold value, if so, entering PID control, and if not, judging that the VVT has a fault. By means of the method, VVT clamping stagnation can be prevented and repaired in the early stage, and the VVT fault rate and engine performance fluctuation are reduced.

The invention belongs to the field of integrated circuits, and particularly relates to a high-Q-value quick-start crystal oscillator based on an MLP neural network. A neural network is used for replacing a complex phase synchronization hardware circuit in a traditional energy injection technology. Firstly, working state parameters of a crystal oscillator are collected in real time through a state collection module; then mapping the received real-time digital information into a corresponding output instruction through a trained MLP neural network model, and further controlling an energy injection module to inject an energy signal in the same phase as crystal oscillation; along with gradual increase of the oscillation amplitude, when the oscillation amplitude reaches a threshold value, the MLP neural network control model outputs an injection stopping instruction, switches the switch state, and submits the instruction to the negative resistance oscillation circuit to maintain steady-state oscillation and output a stable oscillation signal. According to the invention, the low complexity and high robustness are taken into account while quick starting is realized, and a solution is provided for the application of the high-Q-value crystal oscillator in a low-delay and low-power-consumption scene.

The invention discloses a virtual damping control method and system for a wind power grid-side converter, and the method comprises the steps: carrying out the high-precision tracking of an oscillation signal in q-axis current through a frequency phase-locked loop, extracting the oscillation amplitude and frequency in real time, taking the oscillation amplitude as the input of a P I controller, and dynamically calculating an optimal virtual resistance value. Through self-adaptive virtual damping control, the wind power grid-side converter can automatically adapt to complex working conditions such as power grid topology change and equipment switching, so that the grid connection stability of the wind power plant under the weak power grid condition is remarkably improved.

The invention discloses a broadband oscillation test system and test method for a converter, and relates to the technical field of electrical equipment testing, and the system comprises an equipment configuration and access module, a test mode switching module, a test operation and data acquisition module, a data automatic analysis module and a test report generation module. By constructing a closed hardware test loop, the comprehensiveness of the broadband oscillation test of the converter is improved, in a data analysis link, a broadband oscillation characteristic frequency identification formula is introduced, a time domain signal is converted into a frequency domain signal through fast Fourier transform, the broadband oscillation characteristic frequency is obtained, and meanwhile, through an oscillation amplitude normalization formula, the frequency domain signal is converted into the frequency domain signal to obtain the broadband oscillation characteristic frequency. According to the method, the oscillation amplitude after normalization is obtained, the dimensional difference under different working conditions is eliminated, in addition, a system impedance matching degree formula and a stability comprehensive evaluation index formula quantify the stability from the aspect of impedance matching and multi-parameter comprehensive evaluation, and the whole process from feature extraction to risk evaluation is covered.

The invention discloses a broadband oscillation active damping method, system and device based on MMC sub-module cluster collaboration and a storage medium, and relates to the technical field of power system stability control, and the method comprises the steps: collecting the electrical quantity of a power grid in real time, and recognizing a broadband oscillation mode and characteristic parameters through a signal processing algorithm; equivalent circuit parameters of the programmable virtual resonator are calculated, and the number of sub-modules of a sub-module cluster is determined in combination with the real-time states of the sub-modules of the modular multilevel converter; generating a control instruction according to the parameter and the oscillation component, and adjusting a sub-module pulse width modulation signal; oscillation amplitude attenuation, a damping ratio and a sub-module state are continuously monitored, adjustment is performed according to an evaluation result, and safe operation is ensured; the method can accurately suppress power grid oscillation, improves the utilization rate of the MMC device, saves the cost, is high in self-adaption, guarantees the reliable operation of the system, reduces the loss, is easy to expand and maintain due to the modular design, and improves the stability of the power system.

To suppress an increase in power consumption during steady operation while preventing oscillation from stopping during the calibration of an LC oscillator. A calibration circuit includes a reference voltage generation unit, a voltage comparison unit, and an amplitude adjustment unit. The reference voltage generation unit generates a plurality of different reference voltages. The voltage comparison unit compares a detection value of an oscillation amplitude detected from an oscillation signal of the LC oscillator and the plurality of different reference voltages on the same polarity side of the oscillation amplitude. The amplitude adjustment unit adjusts the oscillation amplitude on the basis of a comparison result by the voltage comparison unit. The calibration circuit may include a frequency adjustment unit that adjusts an oscillation frequency of the LC oscillator.

The invention discloses a combustion instability feedforward control method and system based on modal early-stage identification, and belongs to the technical field of combustion control, and the method comprises the steps: S1, collecting a multi-physical field signal in a combustion chamber in real time; s2, based on the multi-physical field signal, identifying a current dominant mode and an amplitude increasing trend of combustion instability in real time; s3, double-condition judgment is carried out, and control is triggered before the oscillation amplitude reaches a preset safety threshold value; s4, matching a corresponding open-loop feedforward control strategy from a preset control strategy library; and S5, generating and applying a modal specific control instruction to drive an execution mechanism to perform intervention. According to the combustion instability feedforward control method and system based on modal early identification, early warning and modal specific control of combustion instability are achieved, the problems of phase mismatch and non-linear inadaptation are effectively avoided, the thermo-acoustic damage risk is remarkably reduced, and the reliability of the system is improved. And the robustness, the real-time performance and the engineering applicability of the control system are improved.

The invention relates to the field of laser welding quality detection, in particular to a multi-modal fusion identification method and system for laser welding defects of copper-aluminum heterogeneous materials. Molten pool images, temperature fields and acoustic emission signals are synchronously collected through a visible light high-speed camera, a thermal infrared imager and an acoustic emission sensor which are coaxially integrated; the width oscillation amplitude, the trailing edge solidification angle, the interface temperature gradient, the acoustic emission characteristic frequency band energy ratio and the burst signal counting rate of the molten pool are extracted; constructing a fusion vector input adaptive weighted deep neural network model, and identifying four types of defects of pores, cracks, incomplete fusion and interface brittle compound layer standard exceeding in real time; and the identification result triggers laser power modulation or protective gas proportion adjustment. The problems that in the prior art, multi-physical field perception is insufficient, the feature adaptability of heterogeneous materials is poor, and real-time control is lack are solved, the defect detection rate reaches 98.2%, and control response delay lt is achieved; and 50ms.

The invention provides a gallium nitride power device packaging parasitic parameter degradation monitoring method. The method comprises the following steps: establishing a high-frequency RLC oscillation model of a gallium nitride power device comprising packaging parasitic parameters under a high-frequency switching condition; judging whether the oscillation amplitude of the switch transient current change rate measurement waveform is reduced compared with the switch transient current change rate reference waveform or not; determining the correlation between the packaging parasitic parameter and the switching transient current change rate oscillation amplitude; predicting whether the packaging of the gallium nitride power device is degraded or not; the change of the change rate of the transient current of the switch is reflected through packaging parasitism, and whether the packaging of the gallium nitride power device is degraded or not is monitored by using packaging parasitism parameters, so that an early signal of the packaging degradation of the device can be effectively identified, and an early tiny packaging degradation sign can be captured; and the accuracy of packaging degradation monitoring is high.

The application relates to a kind of orthogonal time-frequency space (OTFS) signal detection methods based on message selective transmission, suitable for high-speed mobile communication scene.The application first adds the calculation of symbol log-likelihood ratio (LLR) on the basis of original MP detection algorithm, improves the accuracy of message transmission, and optimizes the factor graph structure by introducing edge grouping strategy to group edges with different channel coefficients, reduces the influence of loop effect on detection performance.Then, a damping factor is introduced in the iteration process to control the message oscillation amplitude in each iteration and accelerate the convergence speed of the algorithm.During the detection process, the D-MsP detector further improves the detection performance and convergence efficiency of the OTFS signal in the multipath channel by using the sparsity principle.The D-MsP detector achieves a good balance between performance and computational complexity, significantly reduces the computational overhead while ensuring high detection accuracy, and is particularly suitable for high-speed mobile communication scenarios.

The invention relates to the technical field of frequency stability control, in particular to a power system inertia damping reverse optimization configuration method, system and device based on a reverse distribution principle and a storage medium. A multi-equipment mathematical model containing a synchronous machine and a converter interface power generation device is constructed, equipment phase angle response under active disturbance is simulated, a weak damping oscillation mode is identified, the incidence relation between inertia distribution and oscillation amplitude is analyzed, and the mechanism of inertia dominant oscillation amplitude is clearly displayed; the influence of inertia and damping on the damping ratio is analyzed based on characteristic value disturbance, and a reverse distribution principle of transferring damping from a high-inertia area to a low-inertia area is proposed; three configuration types of reverse distribution, uniform distribution and extreme distribution are defined, and the advantages of reverse distribution are verified through dual-equipment system damping ratio distribution comparison; differentiated configuration strategies are designed for symmetric region, asymmetric region and multi-region scenes, and the performance of a reverse distribution principle is verified through simulation comparison of a frequency response track and a damping ratio numerical value.

This invention discloses a star-pendulum dynamic milling method and a dynamic performance fingerprint testing method. The method includes: constructing a star-pendulum unit consisting of two equal-length circular arcs with equal radii and opposite curvature directions connected end-to-end at the midpoint; defining the feed step size S and the oscillation amplitude W; connecting multiple star-pendulum units end-to-end to form a petal chain tool trajectory; using W=S / 2 as the baseline configuration, determining the maximum stable feed rate F_max by changing S; and plotting the S-F dynamic performance fingerprint curve. This curve is a mapping of multi-dimensional physical constraints such as acceleration constraints, power constraints, and chatter stability boundaries in actual machining onto the S-F two-dimensional graph, filling the technical gap in the quantitative evaluation of the dynamic load-bearing capacity of machining systems. This invention suppresses chatter through high-frequency radial force counter-clamping, decoupling the step size from the material removal rate, enabling machining without regard to allowance, accelerating the research and development iteration of equipment, tools, and new materials, and achieving a measured efficiency 6.7 times that of traditional milling.

The invention discloses a resonance network for suppressing transient recovery voltage of a circuit breaker, and belongs to the technical field of high-voltage alternating-current circuit breaker switching-on and switching-off. The resonance network is composed of a metal oxide arrester and N resonance branches with the same structure. The number N of the resonant branches and the resonant frequencies of the resonant branches are obtained through an electromagnetic transient simulation model; the resonant frequency presents low impedance near the transient recovery voltage fundamental frequency, a shunt and energy consumption path is provided for the high-frequency oscillation current, and active suppression of the rising gradient and the oscillation amplitude of the transient recovery voltage is achieved. The metal oxide lightning arrester is used as backup protection, and clamps the transient recovery voltage peak value when the suppression effect of the resonance branch is insufficient or abnormal. The resonant network can significantly suppress the rise rate and amplitude of transient recovery voltage under a high voltage level in a medium strength recovery critical period, effectively improves the on-off reliability of the vacuum circuit breaker, and has good working condition adaptability and system safety.

The application belongs to the field of oscillators, and particularly relates to a jet flow valve rotating oscillator, which rotates a flow blocking valve in a working cavity, relies on the fluid itself to push the flow blocking valve to rotate, can achieve that the jet flow passing through the flow blocking valve forms jet flows which are in a state of increase and decrease and dynamically change in an upper cavity and a lower cavity, the change of the jet flow in turn pushes the flow blocking valve to rotate back and forth, and further continuously changes the flow area of an outlet hole and controls the opening and closing of an upper feedback channel and a lower feedback channel, under the joint action of the upper feedback channel, the lower feedback channel and the flow blocking valve, periodic fluid oscillation is self-excited, the oscillation amplitude is obviously increased, and mechanical oscillation effect is achieved, which is beneficial to realize multi-dimensional composite vibration of a pipe column system.

The invention relates to the technical field of three-dimensional simulation, in particular to a modeling simulation method of a servo motor. The method comprises the following steps: initializing control parameters of a servo motor; the control parameters are used for executing control direction verification, and encoder feedback signals are recorded; determining a test control direction according to the encoder feedback signal and the control parameter; servo motor design data are obtained, and a three-dimensional simulation model is constructed according to the servo motor design data; inputting a test control direction into the three-dimensional simulation model, and outputting a simulation signal of the servo motor; calculating the oscillation amplitude of the rotor according to the simulation signal; and if the oscillation amplitude of the rotor exceeds the preset oscillation amplitude, correcting the signal phase of the simulation signal, and outputting a corrected simulation signal. Modeling and simulation are carried out on the servo motor based on the three-dimensional simulation technology, the operation characteristics of the servo motor are accurately simulated, and the control precision and the test efficiency are improved through oscillation amplitude monitoring and signal correction.

The present application relates to the technical field of power system stability control, and particularly relates to a power system stability control method based on input and output data optimization control parameters. The method first collects power system input data, output data and oscillation response data; then constructs a parameterized stability controller with several undetermined coefficients, and sets the initial value of the to-be-optimized coefficients; then superimposes the controller output to the additional control channel of the controlled object, constructs an optimization function with the minimum system oscillation as the target, and sets the constraint condition that the average value of the parameters is 0, so as to ensure that the controller output is 0 after the oscillation disappears; then iteratively updates the to-be-optimized coefficients under the constraint condition by using an optimization algorithm, and obtains the target control coefficients; finally, writes the optimized target control coefficients into the parameterized controller, and forms the final stability controller. The simulation results show that the present application can effectively suppress the subsynchronous oscillation and low-frequency oscillation of the synchronous generator, reduce the oscillation amplitude, and speed up the oscillation decay process.

The invention discloses a high-frequency suppression method, device, equipment, medium and product for a multi-terminal direct-current transmission system, and the method comprises the steps: constructing a time-delay-considered MMC high-frequency impedance model based on the multi-terminal direct-current transmission system; collecting a harmonic current signal of each converter station in the multi-terminal direct current delivery system in real time; performing Fourier analysis on the harmonic current signal of each converter station to obtain an oscillation amplitude and an oscillation frequency of the harmonic current signal of each converter station; taking the converter station with the maximum oscillation amplitude in the converter stations as a dominant converter station; and in combination with the MMC high-frequency impedance model, correcting the center frequency of an additional filter in a voltage feed-forward link by using the oscillation frequency of the dominant converter station. According to the embodiment of the invention, the high-frequency suppression effect can be improved.

Provided is a technology that enables a processing program to be easily set, and enables air cutting to be reliably executed in a control device for a machine tool that controls thread cutting with and without oscillation. The control device 1 for a machine tool comprises: a cutting position acquisition unit 11 that acquires a cutting position for thread cutting; a margin acquisition unit 12 that acquires a margin set so that the cutting tool oscillates beyond the cutting position in thread cutting with oscillation; an oscillation amplitude information acquisition unit 13 that acquires oscillation amplitude information indicating the oscillation amplitude of the thread cutting with oscillation; and a thread cutting command generation unit 20 that generates a thread cutting command to oscillate so that at least one end position in the oscillation direction exceeds the cutting position on the basis of the cutting position, the margin, and the oscillation amplitude information.

A controller is described, for controlling a personal care device that has a motor configured to oscillate according to a first drive signal. The controller is configured to receive an input signal that is indicative of a detected electrical characteristic of the motor while the motor is oscillating. Based on the input signal, the controller determines an operational characteristic that is indicative of motor oscillation amplitude and / or power efficiency. The controller then determines and outputs a second drive signal to modify the operational characteristic towards a target operational characteristic. A personal care device having the controller is also described.

The application belongs to the technical field of unmanned aerial vehicle full airborne electromagnetic geophysical prospecting, and particularly relates to an unmanned aerial vehicle full airborne electromagnetic half-sine wave transmitting system and a signal optimization method, which comprises a direct current power supply, an inverter H bridge, a resonance unit, a transmitting coil and a damping absorption unit, wherein an anti-rebound diode is connected in series between the direct current power supply and the inverter H bridge, the inverter H bridge comprises IGBT modules, IGBT modules, IGBT modules and IGBT modules, each IGBT module is connected in parallel with a continuous diode, the IGBT module is connected in series with the IGBT module, the IGBT module is connected in series with the IGBT module, the first tap between the IGBT module and the IGBT module is connected with the second tap between the IGBT module and the IGBT module, the resonance unit is connected in series with the transmitting coil, and the damping absorption unit is connected in parallel with the transmitting coil. The optimized waveform has higher half-sine wave fitting degree and lower current tail oscillation amplitude.

The invention relates to the technical field of radio frequency integrated circuits, and discloses a low-noise biasing circuit for a voltage-controlled oscillator and application of the low-noise biasing circuit for the voltage-controlled oscillator. According to the low-noise biasing circuit, the biasing circuit and a voltage-controlled oscillator core circuit are coupled through an inductor center tap, feedback and self-elimination of low-frequency noise are achieved, and the phase noise performance is remarkably improved; the system integrates a peak detection circuit and a digital logic control circuit, monitors the oscillation amplitude in real time and dynamically adjusts the bias current, realizes adaptive calibration of the amplitude, and ensures that the system works in an optimal state at different process corners and temperatures. The low-noise low-power-consumption high-stability radio frequency chip has the advantages of low noise, low power consumption, high stability and high process adaptability, and is suitable for high-integration-level radio frequency chips such as 5G, Internet of Things and Bluetooth.

Provided is a control device for a machine tool that can suitably shred chips in a state without good conformability. A control device for a machine tool which oscillates a tool and a workpiece relative to each other while machining comprises: a comparison unit that compares the oscillation amplitude calculated value calculated by an oscillation amplitude calculation unit and the oscillation amplitude minimum value set by a minimum value setting unit; an oscillation command generation unit that generates an oscillation command on the basis of the oscillation condition and the value of the oscillation amplitude obtained from the comparison results of the comparison unit; and a position / speed control unit that oscillates the workpiece and the tool relative to each other on the basis of a superimposition command obtained by superimposing the oscillation command over a position command.

The application discloses a network-constructing type electrolytic water hydrogen production unit topology control method suitable for new energy direct connection, and relates to the field of hydrogen production unit topology control. The application constructs a network-constructing type control system for a new energy direct connection scene, forms a unified closed-loop control structure in terms of power modeling, damping adjustment, electricity-hydrogen cooperation and impedance reconstruction, and enables the rectifier to have stronger dynamic support capability under weak power grid conditions. The application can timely enhance system damping in the oscillation energy growth stage and reduce low-frequency and subsynchronous oscillation amplitude. The application realizes dynamic cooperation of the electrolytic cell and the rectifier, weakens the influence of negative resistance characteristics on system stability, and improves the equivalent output impedance of the rectifier under voltage disturbance, so as to improve the equivalent short-circuit capacity and damping ratio of the system.

Disclosed in the present invention is a high-frequency crystal oscillator based on automatic phase error correction. The high-frequency crystal oscillator comprises a high-frequency crystal, a load capacitor, two single-pole double-throw switches, a ring oscillator, an 8-frequency-dividing circuit, a twisted ring counter, a peak detector, a buffer, a digital module, a multiplexer and an amplifier. In the present invention, when a circuit performs energy injection on a high-frequency crystal, a phase error between an injection signal and a crystal oscillation signal is also detected and automatically corrected, such that the phase error is always less than 45 degrees. The present invention ensures the continuous and efficient linear growth in the energy inside a high-frequency crystal, and greatly shortens the starting time required for the crystal to reach a stable oscillation amplitude, thereby realizing rapid starting; and on the basis of automatic phase error correction technology,

Embodiments of the present disclosure relate to a drive circuit for controlling a resonant type MEMS oscillator. A drive circuit for controlling a MEMS oscillator, the drive circuit comprising a digital conversion stage to acquire a differential sense signal indicative of a displacement of a movable mass of the MEMS oscillator and to convert the differential sense signal of an analog type into a digital differential signal of a digital type. A processing circuitry is configured to generate a digital control signal of the digital type from a comparison between the digital differential signal and a differential reference signal indicative of a target amplitude of an oscillation of the movable mass causing a resonance of the MEMS oscillator. An analog conversion stage comprising a sigma-delta DAC and configured to convert the digital control signal into a PDM control signal of the analog type. A filter stage of a low-pass type generates a control signal for controlling an amplitude of the oscillation of the movable mass via filtering of the PDM control signal.

The invention discloses a control method and device of refrigeration equipment, a motor control circuit and the refrigeration equipment, and belongs to the technical field of refrigeration equipment. The refrigeration equipment comprises a motor; the control method of the refrigeration equipment comprises the steps that the speed loop bandwidth of a motor is determined based on the obtained actual oscillation amplitude and target oscillation amplitude of the motor in a target period; and controlling the motor based on the speed loop bandwidth and the actual rotating speed and the target rotating speed of the motor. According to the control method of the refrigeration equipment, the energy consumption of the motor can be effectively reduced without adding other hardware equipment, the energy-saving effect of the refrigeration equipment is improved, and the control cost is reduced.

Provided is a technology capable of reliably carrying out air cutting during oscillation machining for threading regardless of oscillation phase differences. This machine tool control device 1 comprises: a condition acquisition unit 11 for acquiring, as a precondition, one or two pieces of information among three pieces of information, namely, an oscillation phase difference, information regarding a workpiece radial cut depth, and information regarding a radial oscillation amplitude of the workpiece; an air cut amount acquisition unit 12 for acquiring a specified air cut amount indicating the degree of air cut in the oscillation direction; and a machining control unit 13 for determining (a) piece(s) of information not acquired by the condition acquisition unit 11 among the three pieces of information on the basis of the precondition and carrying out machining control such that an air cut amount based on the interval between the n-th threading path and a threading path subsequent to the n-th path matches the specified air cut amount.