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100results about How to "Reduce the difficulty of implementation" patented technology

Defense method for zero dynamic attack of wind power generation system

The invention belongs to the field of network security, and discloses a defense method for zero dynamic attacks of a wind power generation system, which comprises the following steps: constructing a mathematical model of the wind power generation system; a gain scheduling PI controller and electronic adjustable passive elements are introduced into the wind power generation system, and the electronic adjustable passive elements are a controllable inductance module and a controllable capacitance module and are used for adjusting inductance and capacitance of the system; designing a zero-dynamic attack signal, injecting the zero-dynamic attack signal into the system, and analyzing destructive factors of the zero-dynamic attack; defending the designed zero-dynamic attack signal, dynamically adjusting and optimizing the parameter value of the element adjustment coefficient so as to adjust the inductance and capacitance, converting an unstable zero point into a stable zero point, weakening the destructiveness of the zero-dynamic attack, and realizing defending. According to the method, the system can keep stable operation in a complex environment, the dependence limitation in the prior art is overcome, and the defense robustness is enhanced.
Owner:JIANGSU OCEAN UNIV

Large arch foot bench method based on rigid support system

The invention provides a large arch foot bench method based on a rigid support system, and belongs to the technical field of tunnel engineering. The large arch foot bench method based on the rigid support system comprises the following steps that S1, an advance support is constructed on the outer side of a tunnel primary support; s2, an upper step is excavated; s3, constructing a tunnel primary support with a large arch springing in an upper step range; s4, lagging behind the upper step for a certain distance, and excavating a lower step; s5, a lower step primary support in the lower step range is constructed; and S6, follow-up procedures are conducted according to a normal step construction method. The method combines the advantages of a pipe-roofing underground excavation technology, a shallow-buried underground excavation method and a large-arch-foot bench method, construction can be organized according to the conventional bench method under a rigid support system, a large-arch-foot tunnel primary support is arranged on an upper step, the influence on the upper step during excavation of a lower step can be obviously reduced, the implementation difficulty of the construction method is greatly reduced, the operability is high, and the construction efficiency is high. And the construction safety and the construction efficiency are guaranteed, and remarkable economic and social benefits are achieved.
Owner:CHINA RAILWAY CHONGQING SURVEYING DESIGN RES INST CO LTD

Method and system for diagnosing and estimating health state of fuel cell based on polarization characteristics

The invention provides a method and a system for diagnosing and estimating the state of health of a fuel cell based on polarization characteristics, and relates to the technical field of fuel cells, and the method comprises the following steps: constructing a proton exchange membrane fuel cell model based on a multi-condition multi-physical field, extracting health state characteristics of the to-be-diagnosed battery from the proton exchange membrane fuel cell model under a preset typical working condition; and inputting the health state characteristics into a trained fuel cell health state diagnosis model to obtain the health state of the to-be-diagnosed battery evaluated by the fuel cell health state diagnosis model. The method not only can accurately diagnose the health state of the fuel cell, but also is low in implementation difficulty and cost and relatively high in interpretability, so that the dependence of high-precision diagnosis of the health state of the fuel cell on expert experience is reduced.
Owner:WUHAN UNIV OF TECH

Permanent magnet temperature detection method, device and equipment and permanent magnet traction system

The invention discloses a permanent magnet temperature detection method, device and equipment and a permanent magnet traction system, and relates to the technical field of rail transit, and the disclosed permanent magnet temperature detection method comprises the steps: determining the current short-circuit current of a permanent magnet motor; obtaining a preset temperature mapping relationship, wherein the preset temperature mapping represents a corresponding relationship between the short-circuit current and the permanent magnet temperature; and determining a target permanent magnet temperature corresponding to the current short-circuit current according to a preset temperature mapping relation. According to the invention, the temperature of the permanent magnet motor can be measured by detecting the current short-circuit current of the permanent magnet motor and combining the preset temperature mapping relation representing the corresponding relation between the short-circuit current and the temperature of the permanent magnet without observing the change of the flux linkage in operation of the permanent magnet motor, and the accuracy of temperature measurement of the permanent magnet is effectively improved.
Owner:JIANGSU KINGWAY TRANSPORTATION CO LTD

Cloud-side collaborative intelligent building control system, method and equipment

The invention relates to a cloud-side collaborative intelligent building control system, method and device. The system comprises a device layer, a data aggregation layer and a cloud side. Wherein the cloud comprises a data base, a service middle table and an application layer; wherein the data base comprises a virtual controller; the data aggregation layer is used for aggregating the equipment data of the equipment layer and reporting the equipment data to a data base, so that a virtual controller in the data base performs control operation on corresponding equipment in the equipment layer based on the equipment data; the application layer is used for receiving the control instruction and issuing the control instruction to the service middle station; the service middle station is used for issuing the control instruction to the virtual controller; and the virtual controller is used for receiving the control instruction and controlling the corresponding equipment in the equipment layer according to the control instruction. The problems that in the prior art, the system complexity is high, the implementation difficulty is large, and the data change of the to-be-managed equipment in the whole life cycle cannot be mastered can be solved.
Owner:GREE ELECTRIC APPLIANCE INC OF ZHUHAI

Method, device and system for calculating safe working area of MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) and storage medium

The invention discloses a safe working area calculation method, device and system of an MOSFET and a storage medium, and relates to the technical field of semiconductors. The method comprises the following steps: acquiring MOSFET temperature sensitive parameters; obtaining a relation curve between the MOSFET temperature sensitive parameter and the MOSFET junction temperature; acquiring transient thermal impedance of the MOSFET under different duty ratios and different pulse widths; calculating the maximum allowable power loss of the MOSFET under different pulse widths of the single pulse; calculating a safe working area SOA curve coordinate of the MOSFET; and automatically calculating, drawing, storing and outputting a safe working area SOA diagram of the MOSFET on the basis of Qt Widgets. According to the SOA calculation method for the safe working area of the MOSFET, the thermal performance and the electrical performance of the MOSFET are comprehensively considered, the safe working area of the MOSFET is determined through a series of experiments and calculation steps, and the accuracy of a calculation result is improved.
Owner:XIAN ALLTOPLUS SEMICON TECH CO LTD

An intelligent diagnosis method for motor faults based on digital twins

The present invention discloses an intelligent motor fault diagnosis method based on digital twins, belonging to the field of motor fault diagnosis. In the model training stage, the method selects feature quantities through the random forest method to train an extreme learning machine model with an autoregressive cycle function as a digital twin motor. In the open circuit fault diagnosis stage, the method collects the physical entity motor feature quantity and inputs it into the digital twin virtual motor to obtain the digital twin current, and makes a difference between the actual winding current data and the digital twin winding current to obtain the current residual, and uses the difference value of the current residual as a threshold to perform open circuit fault diagnosis, and adopts the sliding average window method to locate the fault; in the turn-to-turn short circuit fault diagnosis stage, the current symmetrical mean absolute error is used as a judgment standard to diagnose the short circuit fault. The present invention does not require precise design parameters and motor fault data of the motor, but only requires data when the motor is in normal operation to quickly and real-time diagnose the motor open circuit fault and turn-to-turn short circuit fault, and has strong robustness.
Owner:NANJING UNIV OF SCI & TECH

An AM-PM distortion calibration method applied to a UWB transmitter

The application provides an AM-PM distortion calibration method applied to an UWB transmitter and belongs to the field of UWB communication. The method adds a sampling resistor between a linear voltage stabilizing power supply LDO and a digital power amplifier DPA driving stage of the UWB transmitter using a digital power amplifier, so as to simulate the instantaneous change of the power supply voltage of the DPA driving stage when the UWB pulse is transmitted; an adjustable delay unit is added between a carrier input port LO and the DPA driving stage; the continuous sine wave is transmitted, the phase information under each digital baseband amplitude control word is collected to form original data of the AM-PM distortion of the UWB transmitter, the digital baseband output AM-PM control word is used to control the adjustable delay unit to output the phase which is opposite to the original data and has the same size, so that the phase predistortion of the transmitted UWB pulse is realized, and the AM-PM distortion calibration is completed. The application has the advantages of simple implementation and strong compensation capacity.
Owner:NEWRADIO TECH CO LTD

A method for compensating for errors in a broadband voltage transformer

PendingCN122546127AComprehensive access to dynamic ratio differencesComprehensive access to features
A broadband voltage transformer error compensation method is proposed. First, a broadband test platform is constructed using a signal generator, power amplifier, standard voltage transformer, and high-bandwidth data acquisition system. The ratio and phase errors of the transformer at multiple frequency points are acquired through primary-side excitation and secondary-side synchronous acquisition. Based on the slope, first derivative, and second derivative characteristics of the error curve, the entire frequency band is adaptively divided into segments. Within each segment, multiple candidate models are fitted using a polynomial or exponential-linear combination model. The optimal model is selected based on the coefficient of determination, mean absolute error, and root mean square error. Ratio and phase error compensators are constructed based on the fitting functions of each segment, and error compensation is achieved using a feedforward approach. This method can significantly reduce amplitude and phase errors over a wide frequency range, improving the dynamic measurement accuracy of the voltage transformer.
Owner:CHINA THREE GORGES UNIV

Narrow-linewidth tunable dual-wavelength laser output system based on data driving

The invention relates to the technical field of solid lasers, and particularly provides a narrow-linewidth tunable dual-wavelength laser output system based on data driving, which comprises a pumping source, a resonant cavity, a data acquisition unit and a data receiving and driving device, a single gain medium, two F-P etalon and an F-P angle regulator are arranged in the resonant cavity, the inclination angles of the two F-P etalon are adjusted through an F-P angle adjuster so as to perform longitudinal mode selection and wavelength tuning on the output laser of the resonant cavity; a neural network screening model is arranged in the data receiving and driving device, the neural network screening model is used for learning the mapping relation between intracavity parameters and output laser optical parameters, and dual-wavelength simultaneous locking and line width prediction are achieved through dual-etalon collaborative mode selection and data driving of the neural network screening model. According to the invention, the complexity of the system is greatly simplified, and dual-wavelength, narrow-linewidth, high-stability, repeatable and automatic laser output regulation and control which cannot be achieved by a traditional architecture are realized functionally.
Owner:CHANGCHUN UNIV OF SCI & TECH

Recommendation system cold start methods and devices, electronic equipment and storage media

This application provides a cold start method, apparatus, electronic device, and storage medium for a recommendation system. The method includes: determining a list of historical clicked content corresponding to user tags based on acquired user tracking data and user tags; calculating feature data of the historical clicked content based on the user tracking data; smoothing the feature data to calculate the click-through rate (CTR) data corresponding to the historical clicked content, and determining a first candidate content list corresponding to the user tags based on the CTR data; determining a second candidate content list based on the first candidate content lists corresponding to multiple user tags under the same user; performing Thompson sampling on the CTR data of the candidate content in the second candidate content list to calculate a random number corresponding to the candidate content; and reordering the candidate content in the second candidate content list based on the random number to determine a user recommendation list. This application can provide users with more differentiated recommended content.
Owner:CHINA PING AN LIFE INSURANCE CO LTD

Terminal device, flexible circuit board

PendingCN122708633AReduce the difficulty of implementationImprove detection coverage
Embodiments of the present application provide a terminal device and a flexible circuit board, which are used to detect whether a battery in the terminal device is bulging without increasing the complexity of the structure of the terminal device. The flexible circuit board is integrated with a first detection electrode and a second detection electrode. When the distance between the first detection electrode and the second detection electrode changes, the signal on the first detection electrode also changes. Therefore, by collecting the signal of the first detection electrode, it can be determined whether the distance between the first detection electrode and the second detection electrode changes. The flexible circuit board is placed on one side of the battery, and the bulging of the battery can drive the above distance to change. By collecting the signal of the first detection electrode, the detection of whether the battery is bulging can be realized. Moreover, the first detection electrode and the second detection electrode are realized by using the flexible circuit board in the terminal device, without the need to additionally introduce other structures, and will not affect the assembly gap between the battery and other components and the overall thickness of the terminal device.
Owner:HUAWEI TECH CO LTD

An active bandpass filter Q value calibration circuit

ActiveCN115694420Bachieve calibrationvalid calibrationBandpass filteringControl signal
The application relates to an active band-pass filter Q value calibration circuit, which comprises an LDO circuit, a calibration signal filter circuit and a Q value calibration detection circuit; wherein the output ends V1 and V2 of the LDO circuit supply power to the calibration signal filter circuit, the output end VREF of the LDO circuit provides a reference voltage for the Q value calibration detection circuit, the output end signals VBP and VBN of the calibration signal filter circuit serve as inputs of the Q value calibration detection circuit, and the output signal VRZ of the Q value calibration detection circuit is outputted <n:0>The control signal is used as a calibration signal to filter circuit. The application can effectively tune the Q value of the filter and improve the consistency of the chip. Compared with the traditional active band-pass filter Q value calibration circuit, the application has the characteristics of small implementation difficulty and high integration.< / n:0>
Owner:NANJING RES INST OF ELECTRONICS TECH

A silicon wafer feeding and processing system

This utility model provides a silicon wafer feeding and processing system, relating to the technical field of silicon wafer processing equipment. The system includes a loading silicon wafer transfer assembly, a unloading silicon wafer transfer assembly, a turntable processing assembly, and a loading / unloading swing arm assembly. The turntable processing assembly includes a turntable assembly and a processing device for processing raw silicon wafers placed on the turntable assembly into finished silicon wafers. The loading / unloading swing arm assembly is used to transfer the raw silicon wafers from the loading silicon wafer transfer assembly to the turntable assembly, and to transfer the finished silicon wafers from the turntable assembly to the unloading silicon wafer transfer assembly. This silicon wafer feeding and processing system integrates the loading silicon wafer transfer assembly, the unloading silicon wafer transfer assembly, the turntable processing assembly, and the loading / unloading swing arm assembly to sequentially complete the loading of raw silicon wafers, the processing of raw silicon wafers into finished silicon wafers, and the unloading of finished silicon wafers. It features a compact structure, small footprint, and low operating cost.
Owner:S C NEW ENERGY TECH CORP

Tunnel jet layer design method considering space-time effect, storage medium and electronic device

This invention relates to the field of tunnel engineering, and particularly to a tunnel shotcrete design method, storage medium, and electronic device that considers spatiotemporal effects. The method includes: calculating the final value of vertical deformation pressure and the radius of the plastic zone of the surrounding rock without support based on tunnel foundation parameters and tunnel shotcrete design parameters; calculating the deformation pressure as a function of time using a deformation pressure calculation formula, combining tunnel excavation speed parameters, the radius of the plastic zone of the surrounding rock, and preset shotcrete hardening characteristic parameters; inputting the deformation pressure-time function into a shotcrete load-support structure model, calculating the safety factor of the shotcrete at each time node based on the shotcrete hardening characteristic parameters, and iteratively adjusting the tunnel shotcrete design parameters according to whether the safety factor meets preset requirements, until outputting tunnel shotcrete design parameters that meet the preset requirements. This invention dynamically calculates deformation pressure considering spatiotemporal effects and iteratively adjusts parameters to ensure the load-bearing safety of the shotcrete throughout its entire life cycle and reduces construction risks.
Owner:CHINA RAILWAY ERYUAN ENGINEERING GROUP CO LTD +1

Air-cooled heat pump unit exhaust vane type silencer structure

The utility model discloses an exhaust vane type silencer structure of an air-cooled heat pump unit, which is mounted above an exhaust fan component of the air-cooled heat pump unit and comprises an upper silencing insert, a lower plenum chamber and a flow deflector component arranged in the lower plenum chamber. The flow deflector assembly comprises flow deflectors, fixing ribs and fixing columns, the flow deflectors are at least used for adjusting flow field distribution in the silencer, and the fixing ribs are connected with the flow deflectors and the fixing columns. The flow deflector is used for adjusting the flow field of airflow entering the silencer insertion piece part, so that the flow field in the silencer is more uniform, the situation that airflow regeneration noise is increased due to the fact that the local wind speed is too high is avoided, and finally the actual noise reduction performance of the silencer is improved.
Owner:浙江省环境科技股份有限公司

A pantograph parameter identification method fusing dispersive physical coding and hypergraph network

The present application relates to the technical field of rail transit equipment state monitoring, and discloses a pantograph parameter identification method fusing frequency dispersion physical coding and supergraph network, comprising: obtaining pantograph head acceleration response under the running state of the pantograph; performing front-end coding on the pantograph head acceleration response to obtain potential beam response state and potential propagation trend state; constructing a tension beam physical coding operator according to the modal dispersion relationship of the contact line tension Euler-Bernoulli beam, and performing frequency domain propagation modulation on the potential beam response state and the potential propagation trend state by using the tension beam physical coding operator to obtain structure constraint time sequence characteristics; and obtaining the structure state parameters of the pantograph based on the structure constraint time sequence characteristics. The present application embeds the dispersion propagation physics prior of the contact line tension beam into the feature extraction process in a hard coding manner, and can realize accurate identification of the structure state parameters of the pantograph from the pantograph head acceleration response which is easy to collect.
Owner:CHENGDU RAIL TRANSIT IND TECH RES INST CO LTD +1

Flat motor

InactiveCN119652007AWith cooling capacityAvoid affecting lifeMagnetic circuit rotating partsWindingsElectric machineFan blade
A flat motor disclosed by the present invention comprises a stator assembly and a rotor assembly located at the inner side of the stator assembly, the rotor assembly comprises a rotor reel, the rotor assembly further comprises a heat dissipation fan, the heat dissipation fan is located at the axial side of the rotor reel, the heat dissipation fan comprises a mounting ring, and the mounting ring is located at the axial side of the rotor reel. One side of the mounting ring is provided with a plurality of mounting parts, the plurality of mounting parts are arranged in the circumferential direction of the rotor winding frame, the plurality of mounting parts are connected with the rotor winding frame in an inserted mode, the other side of the mounting ring is provided with a plurality of fan blades, and the plurality of fan blades are arranged in the circumferential direction of the rotor winding frame. According to the flat motor, the heat dissipation capability can be improved, so that the torque and the power of the flat motor are improved, the use requirement is met, and meanwhile, the influence on the service life of the flat motor is reduced.
Owner:JIANGMEN ZIXIN MOTOR CO LTD

System for accurately regulating and controlling instantaneous energy quality of boiler and rapidly changing load and control method

PendingCN121977195AAdapt to flexible upgrade needsReliable structural supportBoiler controlSteam generation plantsUnit loadWorking fluid
The invention relates to the technical field of coal-fired power plant boilers, and provides a boiler instantaneous energy quality accurate regulation and control rapid load changing system and a control method.The system comprises a main steam system and a reheat steam system and further comprises a first bypass steam system, a second bypass steam system and a control unit; an inlet of the first bypass steam system is connected to a water-cooled wall outlet of the main steam system, and an outlet of the first bypass steam system is connected to a platen superheater inlet of the main steam system; an inlet of the second bypass steam system is connected to a low-temperature reheater outlet of the reheat steam system, and an outlet of the second bypass steam system is connected to a high-temperature reheater inlet of the reheat steam system; the control unit is configured to adjust the steam working medium flow of the first bypass steam system and the second bypass steam system according to a load instruction during the unit load increasing period. According to the scheme, the transformation cost is low, the implementation difficulty is small, and a feasible technical path is provided for an active-service unit to achieve rapid load change and energy quality accurate regulation and control standard reaching.
Owner:XIAN THERMAL POWER RES INST CO LTD

A high parallelism storage-computation integrated polar code decoding method based on coset decoding

PendingCN122512939AImprove bit error rate performanceImprove decoding parallelism
The application discloses a high-parallelism storage-computation integrated polar code decoding method based on coset decoding, and belongs to the technical field of channel coding and decoding. The method comprises the following steps: constructing an error pattern group and a check constraint subgroup; performing coset division on the error pattern group to obtain a set of mutually disjoint cosets; screening a limited number of minimum cosets based on the minimum Hamming weight of the cosets; and performing parallel decoding processing on the paths corresponding to the minimum cosets in the storage-computation integrated architecture. k The number of paths in the traditional multi-bit decoding is reduced from 2 to a preset number L through coset division, and the parallel execution of the likelihood information updating and the path metric calculation is realized in combination with the calculation-type storage array, so that the decoding performance is ensured, the calculation complexity and the hardware resource consumption are significantly reduced, and the decoding throughput and the energy efficiency are improved.
Owner:BEIJING UNIV OF POSTS & TELECOMM

A multi-die storage and computing architecture FPGA with high memory bandwidth

The present application discloses a multi-die storage and computing architecture FPGA with high storage bandwidth, and relates to the field of FPGA technology. The multi-die storage and computing architecture FPGA encapsulates an FPGA die and a storage die together, and a storage and computing unit is formed inside the FPGA die. Each storage and computing unit performs calculations based on instructions and data of a local storage unit. The data read and write ports of the local storage unit in each storage and computing unit are connected to a silicon connection layer, and are connected to the data read and write ports of the storage die via cross-die connections in the silicon connection layer to form a storage and computing read and write channel. The storage die reads and writes data to the connected local storage unit through the storage and computing read and write channel, and a larger data bandwidth can be achieved, so that the waiting time for data can be reduced when multi-core parallel storage and computing operations are realized through multiple storage and computing units, and the storage and computing performance is excellent, the data processing efficiency is high, and the computing speed is fast.
Owner:WUXI ESIONTECH CO LTD

Intelligent traction power supply system power regulation method and system

This invention discloses a power regulation method and system for an intelligent traction power supply system; including: calculating real-time transfer power, and calculating compensation current in real time by combining power transfer error and negative sequence current; calculating current tracking value based on current inner loop command value and voltage synchronization signal; designing a feedforward-feedback composite controller to calculate feedforward compensation amount and feedback control amount respectively; calculating the total duty cycle of PWM modulation signal based on feedback control amount and feedforward compensation amount, and driving the railway power regulator to output the actual current value; the control method and system provided by this invention have low engineering implementation cost, are suitable for traction substation RPC application scenarios, and are easy to promote.
Owner:CHINA RAILWAY DESIGN GRP CO LTD

Operating end, working condition distinguishing method and system thereof and engineering machinery

The invention discloses a working end, a working condition distinguishing method and system thereof and engineering machinery, and relates to the technical field of engineering machinery. The method is applied to the engineering machinery which drives a mechanical arm to act through an oil cylinder so as to adjust the attitude of a working end, and comprises the following steps: acquiring stroke data of the oil cylinder of the engineering machinery and a working state image of the working end, and determining standard attitude data of the working end corresponding to the stroke data based on the stroke data; and determining actual attitude data of the operation end based on the working state image, and finally determining whether the operation end is replaced based on the relationship between the standard attitude data and the actual attitude data. Therefore, the problems of maintenance resource mismatching, low after-sales service efficiency and even secondary faults caused by the fact that potential risks are not thoroughly solved due to the fact that design and manufacturing defects, illegal modification of clients or improper operation cannot be distinguished by means of the current method when the engineering machinery breaks down are solved, and the service quality of the engineering machinery is improved. And the public praise and the market competitiveness of enterprise products are seriously influenced.
Owner:SANY HEAVY MACHINERY

Bridged image processing system based on eDP protocol

The utility model provides a bridge type image processing system based on an eDP protocol, the system comprises an upper computer, an SOC chip and a display module, the SOC chip comprises an eDP auxiliary channel control module used for receiving an instruction signal from the upper computer; the MCU module is used for analyzing the instruction signal, generating a corresponding reply instruction and transmitting the reply instruction to the display module through the eDP auxiliary channel control module; an eDP sending port is built in the upper computer, and an eDP receiving port is built in the display module; and a plurality of eDP main channels are arranged between the eDP sending port and the eDP receiving port, and are used for transmitting video data generated by the upper computer to the display module for display based on the reply instruction.
Owner:NANJING OSIC LTD CO

A method for measuring heat dissipation index and dynamically increasing capacity

The present invention discloses a method for measuring a heat dissipation index and dynamically increasing the capacity. The heat dissipation index is measured through a heat dissipation test body, and includes the following steps: a. measuring the heat capacity C of the heat dissipation test body; b. heating the heat dissipation test body to a certain temperature T, and the temperature T is used as the initial temperature; c. measuring the corresponding temperature change value ΔT within a certain period of time, and the corresponding time t, and recording them; d. calculating the heat value Q released by the heat dissipation test body within the temperature difference according to the heat capacity C of the heat dissipation test body, Q=C*(ΔT); e. calculating the ratio K of the heat value Q to the surface area s of the heat dissipation test body and the required time t, K=Q / (s*t), and the ratio K is the heat released per unit area per unit time of the heat dissipation test body, which is called the heat dissipation index. The present invention uses the measured heat dissipation index for dynamic capacity increase of line conductors, which has significant effect, high stability, convenient measurement, good real-time performance, and low implementation difficulty.
Owner:SHENZHEN DAILU TECH CO LTD

Active control method for high-frequency vibration in variable-weight adaptive robust compensation type structure

The invention relates to the technical field of medium-high frequency vibration control, and discloses a structure medium-high frequency vibration variable weight adaptive robust compensation type active control method, which comprises the following steps of: respectively inputting error signals into a minimum mean square controller, a robust controller and a weight controller for operation; a weight controller compares the squared error signal with a reconstructed reference signal mean value, and adaptively adjusts the weights of a minimum mean square controller and a robust controller according to the signal mean value; the first output control quantity and the second output control quantity are superposed and then act on a structural vibration control point through an electromagnetic actuator to obtain an output signal, the output signal is superposed with an original reference signal, and a new error signal is formed to serve as an input signal of a next round of control operation. According to the method, a reference signal reconstruction technology is adopted, a robust compensation mechanism is additionally arranged, an adaptive variable weight strategy and a convergence time and error robustness statistical method are configured, and the medium-high frequency vibration control effect of structures such as a new energy automobile electric drive assembly speed reducer shell is effectively improved.
Owner:CHONGQING UNIV OF TECH

Three-way orthogonal coil receiving and signal merging method and system for rotary permanent magnet mechanical antenna

The invention discloses a three-way orthogonal coil receiving and signal merging method and a three-way orthogonal coil receiving and signal merging system for a rotary permanent magnet mechanical antenna, and belongs to the field of magnetic induction communication. The method comprises the following steps: performing analog conditioning and analog-to-digital conversion on received magnetic induction signals in each space direction, performing Hilbert transform on digital signals in each space direction, extracting instantaneous phase information of each channel, and obtaining complex signals in each space direction; and performing amplitude and phase coherence degree estimation on the complex signals in each spatial direction, determining a weight coefficient of each spatial direction based on the coherence degree between the complex signals in each spatial direction, and combining the complex signals in each spatial direction based on the weight coefficient of each spatial direction to obtain a combined signal. The signal amplitude of a receiving end signal is effectively improved, the signal-to-noise ratio is improved, and the direction robustness and the communication reliability of the system in a complex environment are enhanced.
Owner:HUAZHONG UNIV OF SCI & TECH

Table look-up type deformation matching and electromagnetic mapping digital twinning system and method

The invention discloses a table look-up type deformation matching and electromagnetic mapping digital twinning system and a table look-up type deformation matching and electromagnetic mapping digital twinning method. The system pre-constructs a multi-physical field simulation database with speed as a main key, stores a deformation three-dimensional model, pressure field data, radar cross section (RCS) data and feature point displacement, and establishes a reduced scale model deformation-speed association list. In the manual mode, the speed is directly input to call corresponding multi-physical field data; in an automatic mode, the displacement of the feature points of the reduced scale entity model is detected in real time through a displacement detection module, the current deformation quantity is calculated, a speed major key is reversely matched by adopting a minimum absolute difference method based on the association list, and then corresponding multi-physical field data is called; and synchronously displaying the deformation three-dimensional model, the pressure field pseudo-color distribution and the RCS map on a visual rendering platform, and realizing digital mapping from entity deformation to a multi-physical field state.
Owner:SOUTHEAST UNIV

Radar deception jamming generation method based on time domain coding metasurface phase coding

ActiveCN117554906BDeception and interference implementationno longer regularWave based measurement systemsTime domainRadar
The application discloses a radar deception jamming generation method based on time domain coding metasurface phase coding, and comprises the following steps: setting the code length of an intra-pulse phase coding sequence, setting a plurality of coding modulation phase differences according to the time domain coding metasurface phase modulation capacity, and designing a time domain coding metasurface phase modulation function according to the set code length and the plurality of coding modulation phase differences; coding the plurality of coding modulation phase differences to obtain a coding set, initializing the intra-pulse phase coding sequence according to the coding set to obtain an initial intra-pulse phase coding sequence; setting a jamming position, and optimizing the initial intra-pulse phase coding sequence by using an optimization algorithm to obtain an optimal intra-pulse phase coding sequence; calculating an optimal coding modulation phase difference sequence according to the optimal intra-pulse phase coding sequence, and modulating a radar echo signal according to the time domain coding metasurface phase modulation function corresponding to the optimal coding modulation phase difference sequence to realize the deception jamming of the radar. The application can realize the deception jamming of the radar at any position.
Owner:XIDIAN UNIV

A thermal control structure and a thermal control method thereof

ActiveCN117348358BImprove temperature consistencylower requirement
The application discloses a thermal control structure, which comprises a low-precision heater in direct contact with a heating object, a heater substrate fixed to the other side of the low-precision heater, a high-precision heater fixed to the other side of the heater substrate, a temperature control boundary body fixed to the other side of the high-precision heater, and a plurality of temperature testing components fixed to the other side of the temperature control boundary body. The thermal control structure can make the temperature measuring boundary have higher temperature consistency, reduce the requirement for a temperature control algorithm, reduce the difficulty in realizing the constant-temperature boundary, and reduce the number of temperature sensors and the manufacturing cost. The application also discloses a thermal control method, which has the same advantages.
Owner:CHANGCHUN NAT EXTREME PRECISION OPTICS CO LTD