25 results about "Resonance frequency shift" patented technology

The invention relates to the technical field of wireless charging, and provides a foreign matter detection method and system for a wireless charging system and a storage medium. The method comprises the following steps: firstly, calibrating at multiple temperature points and establishing a temperature-parameter comparison table under the condition of no foreign matters; in a no-load standby state, the inversion module sends out detection drive and collects voltage, current and temperature; calculating a real-time quality factor and resonant frequency according to sampling, obtaining a compensation reference according to a temperature look-up table, and solving the variation of the quality factor and the resonant frequency; and performing fusion judgment by adopting dual-condition locking or weighted scoring, and triggering fault protection when a foreign matter is confirmed. Due to the fact that equivalent inductance and resistance changes are caused by metal foreign matters, quality factors are remarkably reduced along with resonant frequency deviation, temperature excursion and foreign matter effects are distinguished through temperature compensation, and dual-condition locking or weighted scoring fusion judgment is combined, the interference immunity and accuracy of detection are improved, false alarms and missing alarms are remarkably reduced, and the detection accuracy is improved. The method is suitable for high-power wireless charging scenes.

The invention relates to an air tightness detection device and method based on resonance frequency shift of a resonant cavity, belongs to the technical field of air tightness detection, and aims to solve the problems of high equipment cost, complex operation, low efficiency and difficulty in realizing multi-parameter quantitative detection in the traditional air tightness detection technology. High-purity helium with rated pressure is filled into a to-be-detected piece through a gas compressor, the to-be-detected piece is placed in a volume-adjustable detection container after pressure maintaining, and leaked helium is pumped by a vacuum pump to flow into a resonant cavity; resonance frequency deviation caused by helium concentration changes is monitored, temperature and humidity calibration data are combined, three air tightness parameters including the leakage rate (Pa.m / s), the leakage speed (mL / min) and the leakage pressure (Pa) are calculated in real time through a microcontroller, and the air tightness grade of a to-be-detected piece is output according to the air tightness detection standard. According to the device, the volume of the detection container is adaptively adjusted through the sliding rail, and the detection efficiency and adaptability can be remarkably improved by combining frequency mixing excitation and a rapid frequency calibration technology; according to the method, resonance frequency shift-helium concentration-airtightness parameters are converted, and high-precision, multi-parameter and integrated airtightness detection is realized. The invention has the advantages of fast response speed, strong anti-interference performance, low cost and the like, is suitable for fast automatic leak detection of industrial products such as sealing devices, pressure containers and the like, and provides a new scheme for trace gas detection and gas tightness grading.

The application discloses a kind of hollow degree and grain fullness of pepper multi-dimensional acoustic online monitoring method and system, it is related to agricultural product quality detection technical field, method includes: by reticular conveyor belt makes the uniform speed of the pepper monomer to be measured in sound insulation shielding channel movement;Utilize air coupling ultrasonic emission probe to the pepper monomer to be measured directional emission ultrasonic wave, utilize transmission wave receiving probe to capture transmission wave after penetrating the pepper, simultaneously utilize micro sound emission sensor to capture the micro sound emission signal of the pepper;Extract the cavity resonance frequency offset of transmission wave and sound energy attenuation coefficient, carry out band energy extraction to the micro sound emission signal to calculate sound energy entropy;After multi-dimensional acoustic characteristics are standardized respectively, as multi-dimensional feature vector, input into the support vector regression model that is trained in advance, output the hollow and fullness comprehensive evaluation index of the pepper monomer to be measured.This scheme can reduce detection cost, no radiation and can accurately penetrate epidermis to obtain internal grain real state.

The invention provides a data processing system and method for textile auxiliary production, and the method comprises the steps: generating a dynamic gradient data set through monitoring the flowing state of a textile auxiliary solution; acquiring a reflection signal parameter set of the surface of the to-be-processed textile base material under electromagnetic excitation of a preset frequency band, constructing an energy distribution map based on resonance frequency deviation data associated with a plasma resonance effect in the reflection signal parameter set, and performing dynamic coupling on the energy distribution map and the dynamic gradient data set to generate a spatio-temporal evolution data set, extracting infiltration dynamic fluctuation data, and generating a hidden variable set representing molecular structure characteristics of the textile auxiliary agent; in combination with a preset infiltration rate constraint condition, generating a target parameter data set to perform data processing of textile auxiliary production; according to the method, the limitation that static surface energy detection and dynamic auxiliary agent flow analysis are disjointed in the prior art is broken through, real-time dynamic adaptation of the surface energy of the base material and the molecular characteristics of the auxiliary agent is achieved, and the infiltration uniformity and the process regulation and control precision are improved.

According to the technical scheme, the thin plate sound absorption device applied to the bogie cabin of the high-speed train is characterized in that the thin plate sound absorption device comprises a mounting frame, a main sound absorption thin plate is arranged in the mounting frame, an auxiliary sound absorption thin plate is arranged on the other side of the main sound absorption thin plate, and a cavity is defined by the main sound absorption thin plate and the auxiliary sound absorption thin plate; an adjusting plate is arranged in the auxiliary sound absorption thin plate; by arranging the cavity, when aerodynamic noise in a bogie area is introduced, air columns in the cavity resonate with noise sound waves, sound energy is dissipated through perforated structures of the main sound absorption thin plate and the auxiliary sound absorption thin plate, the adjusting plate is arranged in the auxiliary sound absorption thin plate, and when the adjusting plate is close to the main sound absorption thin plate, the effective volume of the cavity is reduced; the resonant frequency shifts to high frequency; and when the adjusting plate is far away from the main sound absorption thin plate, the effective volume of the cavity is increased, and the resonant frequency deviates to low frequency, so as to adapt to the frequency spectrum change of aerodynamic noise at different train speeds.

A device for affecting noise, vibration, and harshness (NVH), for instance, reducing the NVH. The device includes a pouch, which further includes a magneto-rheological material. The pouch has a resonance frequency of vibration. The device further includes one or more coils associated with the pouch. The device is configured to activate the one or more coils associated with the pouch, which causes a property of the magneto-rheological material of the pouch to change and thereby shifts the resonance frequency of the pouch.

The application discloses a high-precision capacitive acceleration sensor based on a high-order non-Hermite circuit and belongs to the technical field of electronic sensors. The high-precision capacitive acceleration sensor comprises a capacitive accelerometer CO, a high-speed same-direction amplifier LM6171 and passive elements, the passive elements comprise a left LC resonator and a right LC resonator, the capacitive accelerometer is connected between the left LC resonator and the right LC resonator, the left LC resonator and the right LC resonator are respectively connected with a positive resistor R, a voltage source V g , a voltage source internal resistance Z0, a resistor R0 and a resistor R f containing an equivalent circuit of the high-speed same-direction amplifier LM6171 in parallel. The high-precision capacitive acceleration sensor based on the high-order non-Hermite circuit has the advantages of high sensing precision, strong structural stability, simple manufacturing process, low cost, good comprehensive performance, fast response, high sensitivity and suitability for actual use. Moreover, the non-Hermite circuit has the advantages of high efficiency, high flexibility, high degree of freedom, high adjustability, high circuit resonance frequency shift and high sensitivity.

An ultrasonic resonance electrode design method for dissimilar metal resistance spot welding comprises the following steps that S1, an acoustic wave geometric model of an electrode is constructed, and the acoustic wave geometric model comprises the welding end diameter D1, the connecting end diameter D2, the welding end length L1 and the connecting end length L2; s2, roughly adjusting the length L2 of the connecting end: introducing an ultrasonic energy field, setting a target working frequency, and continuously changing the length L2 of the connecting end until the first-order longitudinal resonant frequency of the system deviates to be close to the target frequency; s3, the length L1 of the welding end is finely adjusted based on the amplitude requirement of the end face of the welding end; s4, flange positioning, wherein the axial position where the displacement amplitude of the connecting end is zero is determined to be the flange mounting position where the sound energy loss is minimized; s5, electrode wear under different system resonance frequencies is simulated to determine a flange connection mode; and S6, system verification. According to the design method of the ultrasonic resonance electrode for dissimilar metal resistance spot welding, the structure of the electrode meets the requirement for balancing ultrasonic resonance frequency and amplitude output, and the welding quality can be remarkably improved.

The invention discloses a multi-mode adjustable intelligent shock absorber based on an acoustic superstructure and a control method, and belongs to the technical field of vibration and noise control. The structure comprises a base body structure, resonance units and an intelligent control system for regulating and controlling the working mode of each resonance unit. The resonance unit is a key structure for generating a band gap. The intelligent control system comprises a sensor, a controller and an actuator; the sensor monitors the vibration state of the structure in real time and transmits a signal to the controller; the controller generates a control instruction according to a built-in algorithm, and drives the actuator to dynamically change the connection mode of the resonant unit, so that the resonant frequency of the resonant unit shifts, and switching of working modes is realized. Through a semi-active control strategy, a plurality of resonance units are cooperatively regulated and controlled, so that the vibration reduction band gap of the structure can move or be widened in a frequency domain, the vibration reduction structure effectively adapts to the change of external excitation frequency, the defect that the band gap of a traditional acoustic metamaterial is fixed is overcome, and the self-adaptive vibration reduction performance in a broadband range is remarkably improved.

The application provides a data processing system and method for textile auxiliary production, which generates a dynamic gradient data set by monitoring the solution flow state of the textile auxiliary; acquires a reflection signal parameter set of a surface of a textile substrate to be processed under electromagnetic excitation of a preset frequency band, constructs an energy distribution map based on resonance frequency offset data associated with plasma resonance effect in the reflection signal parameter set, and dynamically couples the energy distribution map with the dynamic gradient data set to generate a time-space evolution data set, extracts infiltration dynamic fluctuation data, and generates a latent variable set representing the molecular structure characteristics of the textile auxiliary; in combination with a preset infiltration rate constraint condition, a target parameter data set is generated for data processing of textile auxiliary production; the application breaks through the limitation of the disconnection between static surface energy detection and dynamic auxiliary flow analysis in the prior art, realizes real-time dynamic adaptation of the substrate surface energy and the auxiliary molecular characteristics, and improves the infiltration uniformity and process control precision.

The invention provides an automatic cleaning method and system for a rice wine brewing tank. A wine dirt adhesion area is recognized through a residue distribution image on the inner wall of the rice wine brewing tank; identifying a targeted cleaning path of the rice wine brewing tank according to the geometrical characteristics and the viscosity coefficient of the wine dirt adhesion area, and performing targeted pretreatment on the wine dirt adhesion area according to the targeted cleaning path; determining the resonant frequency offset of the rice wine brewing tank after the targeted pretreatment, and identifying the adhesion state of the wine dirt adhesion object according to the resonant frequency offset; identifying a falling critical point of wine dirt stickers in the rice wine brewing tank by combining the adhesion state with a flushing fluid turbidity change curve monitored by the rice wine brewing tank in real time, and further generating a gradient pressure reduction instruction; and in response to a gradient pressure reduction instruction, activating an annular air curtain generator in a low-pressure turbulence mode to adsorb and clean fine particles on the inner wall of the rice wine brewing tank. According to the technical scheme, precise matching of cleaning power and wine dirt removing requirements can be achieved in the cleaning process of the interior of the rice wine brewing tank.

The invention discloses a wide-angle stable ultrathin low-frequency wave absorber based on an electromagnetic metamaterial, and belongs to the technical field of artificial electromagnetic structures and radar stealth. A core of the wave absorber is of a multi-layer composite structure formed by a plurality of wave absorbing units which are periodically arranged in a hexagonal honeycomb shape in space, and each unit comprises a copper-based resonance layer etched with three curve narrow slits, an epoxy plate layer, a hexagonal patch layer, a high-molecular polymer layer and a conducting substrate layer from top to bottom. Through the special geometric configuration and the spatial alignment relationship of the resonance layer and the patch layer, and in combination with the lamination design of the sub-wavelength thickness (0.908 mm), efficient absorption with the reflection loss superior to-19.7 dB is realized at the low frequency of 0.21 GHz, and the relative thickness is as low as lambda 0 / 1573. The structure has excellent angle and polarization stability at the same time, the resonant frequency deviation is smaller than 5 MHz in the incidence range of 10-70 degrees, and the absorption performance is kept consistent in the full polarization range of 0-180 degrees. The invention effectively solves the problems of'thickness-performance 'contradiction and angle sensitivity of the traditional wave-absorbing material in a low-frequency band, and provides a high-performance solution for the fields of radar stealth, electronic countermeasure, electromagnetic compatibility and the like.

The invention provides a flexible RFID tag antenna suitable for a non-good conductor, which belongs to the field of radio and comprises a flexible dielectric substrate, an annular radiation unit positioned on the flexible dielectric substrate and a radio frequency chip positioned on the annular radiation unit, the arched matching unit is bridged to the inner ring of the annular radiation unit and is radially symmetrical about the annular radiation unit, the arrow-shaped units are uniformly connected to the inner ring of the annular radiation unit, and each arrow-shaped unit points to the center of the annular radiation unit; the flexible requirement is met, the arched matching unit can reduce discontinuity of a traditional right-angle transition position and improve radiation efficiency and gain, and the arched matching unit is used for adjusting antenna impedance so as to make up resonant frequency deviation caused by a human body, achieve conjugate matching with a radio frequency chip and achieve long-distance reading. The arrow-shaped units form a slow wave structure, the electromagnetic wave propagation constant is increased, the phase velocity is reduced, meanwhile, the equivalent electrical length and the effective radiation area are increased, and miniaturization is achieved.

The application discloses a high-voltage connector fault prediction method, relates to the technical field of fault prediction, and solves the technical problems of incomplete fault mechanism coverage caused by the lack of multi-dimensional sensitive features, inaccurate thermoelectric coupling effect capture, unable to compensate signal transmission delay, lack of dynamic compensation mechanism, and low practicability of prediction results; the interference of environmental vibration is eliminated by extracting the resonance frequency offset of the vibration signal through FFT transformation; a temperature change rate correction term is introduced into the temperature resistance coupling coefficient; the linear coupling features output by the bivariate LSTM and the nonlinear coupling features extracted by the KPLS are combined to construct a thermoelectric coupling feature set, and full-stage coverage of the thermoelectric coupling effect is realized. The improved Transformer model quickly adapts to a new scene through small sample transfer learning. Based on the dynamic compensation coefficient output by the fusion features, the signal transmission delay under the conditions of rapid temperature change and electromagnetic interference can be corrected in real time.

The application discloses a double-dimension multi-gas sensor based on artificial plasmons and a gas detection system, wherein the sensor comprises, from bottom to top, a grounding plate, a dielectric substrate, a metal microstrip transmission line, a bottom sensitive dielectric layer, an artificial plasmon resonator and a first conductive layer and a second conductive layer at the same height level; the sensor is based on a vertical laminated structure to construct single-resonator double-dimension orthogonal decoupling; wherein the artificial plasmon resonator and the bottom sensitive dielectric layer construct a response mechanism of 'bottom dielectric constant-resonance frequency shift' to a target gas A; the artificial plasmon resonator and the first conductive layer and the second conductive layer construct a response mechanism of 'top layer conductivity-resonance amplitude modulation' to a target gas B. The application utilizes a vertical laminated structure to construct two independent detection dimensions on the projection area of only one single resonator, and realizes simultaneous detection and decoupling of two gases.

This invention relates to a non-destructive testing method, system, and equipment for the burial depth of utility poles based on nonlinear acoustic features. The testing method includes: S1, applying a broadband transient impact excitation to the sidewall of a concrete utility pole to induce a vibration response in the dominant resonant mode; S2, simultaneously acquiring the force signal of the impact excitation and the acceleration signal of the vibration response to obtain a time-domain response signal; S3, extracting nonlinear acoustic features from the response signal, including at least one of higher harmonic features and resonant frequency shift features; S4, inputting the extracted nonlinear acoustic features into a calibrated regression model to output a quantitative index characterizing the degree of delamination damage at the steel-concrete interface in the concrete utility pole. This invention overcomes the limitation of existing linear acoustic methods, which can only qualitatively judge severe damage, and enables early detection and quantitative assessment of hidden damage such as early delamination and microcracks at the steel-concrete interface.

The invention discloses an MC-WPT system energy efficiency improvement method and system based on dispersive medium parameter optimization. The method comprises the following steps: establishing a mathematical model of constitutive parameters, electromagnetic energy storage time average density, dissipation characteristics, magnetic field action intensity and damping coefficients of the dispersive medium; analyzing frequency characteristics and damping characteristics of a medium by adopting a normalization method, and determining action mechanisms of a real part and an imaginary part of constitutive parameters on electromagnetic energy storage and medium dissipation respectively; a frequency regulation and control method and a damping regulation and control method of the metamaterial dispersive medium plate are provided, a metamaterial design method which comprehensively considers the near-field coupling effect, inhibits resonant frequency deviation and reduces the internal resistance of a spiral conductor is established, and the limitation that only the real part of magnetic conductivity is concerned and the overall performance is represented by depending on a unit in the traditional design is overcome. The constitutive parameters of the dispersive medium are optimized, and the magnetic field distribution is improved, so that the transmission performance of the system can be improved.

The application discloses a bulk acoustic wave resonant type temperature sensing device based on thermal mismatch and a preparation method, a cantilever beam type heterostructure is designed as a thermal mismatch core unit, the thickness and form of each layer are further designed, efficient and accurate transmission of "temperature-stress" is realized, and through high sensitivity of the FBAR structure to stress and high reflectivity of the cavity structure to sound waves, stress change is further converted into significant resonance frequency shift, high sensitivity, high response and high precision temperature measurement are realized. In addition, the preparation process is compatible with the standard MEMS process, and a solution is provided for batch manufacturing of miniaturized, high-stable and high-consistent temperature sensors.

The invention discloses a battery electrochemical reaction detection system and a test method. The system comprises an optical detection unit, a magnetic resonance excitation unit and a data processing unit, the optical detection unit comprises an NV color center detector, and the NV color center detector is connected with the magnetic resonance excitation unit and placed in a battery electrochemical reaction solution sample to be detected; the magnetic resonance excitation unit is used for outputting a magnetic resonance regulation and control signal, influencing the quantum spin state of the NV color center and changing the intensity of an NV fluorescence signal, the collection light path collects the intensity of the fluorescence signal to the data processing unit, and an NV color center ground state spin resonance spectrum is obtained; and the data processing unit acquires the NV color center ground state spin resonance spectrum, and acquires the detection of magnetic signals, electric signals and thermal signals in the electrochemical reaction process of the battery by combining the difference response of the external magnetic field and the electric field to the NV color center ground state spin resonance frequency shift. And nanoscale and multi-parameter synchronous in-situ dynamic detection in a real battery environment is realized.

The invention discloses a multi-mode integrated optical microcavity, and belongs to the technical field of integrated photonic devices.The multi-mode integrated optical microcavity comprises a first microcavity structure and a second microcavity structure which are coupled in the vertical direction, and the first microcavity structure and the second microcavity structure are made of different materials; and the thickness and the width of the waveguide are adjusted, so that the two microcavities have approximately same free spectral ranges in a preset working wave band. Due to the fact that the two materials have different thermo-optical coefficients, differential resonance frequency shift can be naturally generated when the double-layer micro-cavity is subjected to thermal tuning, and the vernier coupling effect between the micro-cavities is combined to form the mole acceleration effect, so that large-range adjustment of the dispersion characteristic of the micro-cavity is achieved. By controlling thermal excitation conditions, switching between normal dispersion and abnormal dispersion can be realized, so that a single device supports multiple optical working modes. The reconfigurable integrated photonic system is simple in structure, stable in regulation and control, high in process compatibility and suitable for the reconfigurable integrated photonic system.

This application relates to a control method for a smart appliance and a smart appliance in the field of smart appliances. The method includes acquiring an ultrasonic vibration signal received by a piezoelectric sensor. The ultrasonic vibration signal is the ultrasonic signal received by the piezoelectric sensor after the ultrasonic vibration generated by the piezoelectric sensor is transmitted through a metal substrate and resonantly reflected by the package when an alternating voltage is applied to it. Based on the ultrasonic vibration signal, the resonant frequency offset of the package in the semiconductor lamp is determined. Based on the resonant frequency offset and the initial resonant frequency of the package in the semiconductor lamp, the aging value of the semiconductor lamp is determined. Based on the aging value, the lighting control of the semiconductor lamp in the smart appliance is performed. This application solves the problem of difficulty in accurately detecting the color temperature decay of semiconductor lamps due to the aging of the packaging material.

The application discloses a double-dimension multi-gas sensor based on artificial plasmons and a gas detection system, wherein the sensor comprises, from bottom to top, a grounding plate, a dielectric substrate, a metal microstrip transmission line, a bottom sensitive dielectric layer, an artificial plasmon resonator and a first conductive layer and a second conductive layer at the same height level; the sensor is based on a vertical laminated structure to construct single-resonator double-dimension orthogonal decoupling; wherein the artificial plasmon resonator and the bottom sensitive dielectric layer construct a response mechanism of 'bottom dielectric constant-resonance frequency shift' to a target gas A; the artificial plasmon resonator and the first conductive layer and the second conductive layer construct a response mechanism of 'top layer conductivity-resonance amplitude modulation' to a target gas B. The application utilizes a vertical laminated structure to construct two independent detection dimensions on the projection area of only one single resonator, and realizes simultaneous detection and decoupling of two gases.

The invention discloses a microwave ablation tissue monitoring system and method based on acoustic resonance frequency shift, and relates to the field of medical science and technology, and the key point of the technical scheme is that the microwave ablation tissue monitoring system comprises a microwave ablation probe, an acoustic sensing module, a signal processing unit and an ablation control terminal. A piezoelectric excitation array and an acoustic receiving array are integrated, a coded sound wave pulse is transmitted to a target tissue, an echo signal is received, and tissue resonance frequency offset f is extracted from the echo signal so as to judge the conformation state of collagen in the tissue. The system may dynamically adjust a microwave energy parameter or terminate ablation based on the state. The system can realize real-time identification and feedback control of a tissue necrosis state, has higher sensitivity, molecular-level identification capability and closed-loop regulation and control advantages compared with a traditional electrical or thermal monitoring mode, and effectively improves the precision and safety of microwave ablation treatment.

The invention relates to the technical field of environmental monitoring, and discloses an ecological seawall zone biological activity monitoring method, which comprises the following steps: selecting a seawall zone local salt-tolerant plant as a monitoring carrier, softly winding or shallowly burying a flexible optical fiber array outside a plant root system to realize non-invasive fixation, and coating a vibration sensitive layer on the surface of an optical fiber; a micro fluid channel is embedded in a flexible optical fiber array to simulate a capillary structure of a plant root system, biological activity secretions are passively collected to induce refractive index change, and an optical fiber coating integrated piezoelectric material captures the biological potential change of the root system to dynamically regulate and control a detection threshold value; the optical fiber network captures resonance frequency shift by using a Bragg grating, and generates a multi-spectrum data stream in combination with a distributed optical fiber vibration sensing technology; and aggregating data to a cloud platform through a wireless transmission module to generate a three-dimensional ecological activity heat map and support prediction alarm. According to the invention, a plant root system is used as a signal amplifier, and non-invasive global biological activity monitoring is realized.

The invention discloses a terahertz dielectric constant sensor and method based on SIW and CSRR. The sensor is of a three-layer planar structure and comprises a medium substrate and metal layers on the upper surface and the lower surface of the medium substrate. Two groups of nested complementary split ring resonators (CSRR) which are symmetrically arranged are etched on the top layer metal, and each group of CSRR consists of a large ring and a small ring which are opposite in opening direction and overlapped in circle center; metalized through hole arrays are arranged on two sides along the signal transmission direction and form a substrate integrated waveguide (SIW) structure together with the upper metal layer and the lower metal layer. A to-be-detected object is placed above a resonance area, resonance frequency deviation caused by the to-be-detected object is detected, and the dielectric constant can be calculated by using a pre-stored calibration relation. According to the invention, the closed field constraint characteristic of the SIW and the strong field local effect of the CSRR are combined, and the device has the advantages of high Q value, high sensitivity, miniaturization, easy integration and wide sample applicability, and is especially suitable for accurate and lossless dielectric measurement of the terahertz frequency band.