208results about "Resonant frequency" patented technology

A system for material detection and identification includes an interface configured to access a. material database associating each of a plurality of materials with one or more corresponding resonance frequencies: an RF transmitter configured to, for each material of at least a subset of the plurality of materials in the material database, transmit into an environment an RF signal at a first resonance frequency for the material; an RF receiver configured, to receive a response signal from the environment for each RF signal; and a processor configured to analyze each response signal for resonance characteristics that indicate a presence of the material and identifying the material to a user if the presence of the material is indicated by the resonance characteristics.

The invention discloses a loss tuning method of a power transformer, which is applied to a transformer body sleeved with a winding and comprises the following steps: applying scanning current excitation containing fundamental waves and harmonic waves to the winding, synchronously acquiring a body vibration signal and converting the body vibration signal into a frequency spectrum; extracting a formant from the frequency spectrum, matching the formant with a theoretical electromagnetic force wave and a structure inherent frequency library, and identifying a coupling formant to be optimized; aiming at each formant, installing a vibration exciter in a corresponding area, sending out an anti-phase periodic pulse force, and dynamically and finely adjusting a pulse force parameter by monitoring a vibration response in real time and taking equivalent mechanical impedance minimization as a target; when the optimal damping state is achieved, the vibration exciter output rod is locked, and static pre-tightening force is formed; and after all formants are adjusted and optimized in sequence and the prestress is locked, final pressing and fixing of the transformer body are completed in the state that the pretightening force is kept. According to the invention, the dynamic loss source of the individual transformer can be actively inhibited and cured before assembly and curing, the operation loss and noise are effectively reduced, and the structural stability is improved.

The invention relates to a cable joint resonance real-time diagnosis method and device and a medium, and belongs to the technical field of power equipment state monitoring, and the method comprises the following steps: obtaining a high-frequency current signal collected by a high-frequency current sensor and an ultrasonic vibration signal collected by an ultrasonic sensor array; performing signal synchronization on the high-frequency current signal and the ultrasonic vibration signal, and extracting a high-frequency current feature and an ultrasonic array feature; calculating a dominant frequency synchronization index, a normalized phase stability index and a nonlinear coupling index based on the high-frequency current characteristics and the ultrasonic array characteristics, and performing weighted summation to determine a fusion confidence coefficient function; and judging whether resonance exists or not based on the fusion confidence coefficient function, and if so, carrying out resonance source positioning. Compared with the prior art, the method has the advantages of high precision, low false alarm and high adaptability, and is suitable for key power system scenes such as new energy grid connection, urban smart power grids and wind power.

A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.

The invention provides an inhaul cable self-vibration fundamental frequency automatic identification method and system based on a harmonic product spectrum, and relates to the technical field of structure monitoring, and the method comprises the steps: receiving vibration acceleration data of an inhaul cable, carrying out the windowing processing of the vibration acceleration data through employing a Hanning window, and generating a windowed signal; carrying out fast Fourier transform on the windowed signal, and improving the frequency resolution by implementing zero filling to obtain an initial frequency spectrum; smoothing the initial frequency spectrum to form a smooth frequency spectrum; performing passband clipping on the smooth frequency spectrum to zero the passband outer amplitude to form a clipped frequency spectrum; calculating the signal-to-noise ratio of the frequency spectrum after cutting, and comparing the signal-to-noise ratio with a preset threshold value; if the signal-to-noise ratio is lower than a preset threshold value, judging that the signal quality is unqualified and terminating the processing flow; and if the signal-to-noise ratio is equal to or higher than the preset threshold value, continuing the normal processing flow. According to the invention, automatic and high-precision identification of the self-vibration fundamental frequency of the inhaul cable can be realized.

The invention discloses a method for detecting and inhibiting resonance of a two-axis photoelectric pod. Belongs to the technical field of photoelectric pod control systems, and particularly relates to the technical field of two-axis photoelectric pod resonance detection and suppression. According to the invention, a stable precision index is taken as a discrimination standard of a resonance condition, a self sensor is utilized, a resonance frequency automatic detection and identification method is adopted, filter parameters are adaptively adjusted according to resonance frequency point distribution characteristics, and the resonance frequency is suppressed through a signal processing algorithm, so that interference of the resonance frequency on a test is effectively avoided. According to the method, the self-adaptive capability of the photoelectric pod is enhanced, so that the photoelectric pod can cope with different external interference factors, and especially in a special vibration environment, the pod can keep relatively high stability and precision. According to the method, the problem of vibration interference in a traditional method can be effectively solved, and the adaptability of the photoelectric pod in a vibration environment can be remarkably improved.

The invention discloses a single-port detection resonator resonant frequency on-line real-time measurement system for an MEMS gyroscope, and the system comprises a closed-loop drive circuit which is used for driving a resonator to resonate and outputting a drive detection signal; the first C / V conversion circuit converts the current into a detection voltage signal, and the on-off of the first C / V conversion circuit and the negative resistance circuit is controlled by a voltage control switch; the negative resistance circuit enables the equivalent input resistance of the first C / V conversion circuit to be a negative value so as to generate positive damping feedback force on the detection resonator; the multiplier is used for carrying out multiplication demodulation on the detection voltage signal and the driving detection signal, and the angular velocity of the MEMS gyroscope is output after the signals are filtered by the low-pass filter; the upper computer controls the on-off of the voltage control switch, the frequency fd and the frequency fs are calculated through fast Fourier transform by driving the detection signal and the detection voltage signal respectively, the frequency difference is obtained by solving the difference, and the resonant frequency of the single-port detection resonator is measured on the premise that the work of the MEMS gyroscope is not affected.

A method for determining a vortex-induced resonance region of a wind turbine blade and an anti-vortex device are provided, and relates to the technical field of wind power equipment. The method includes: obtaining the natural frequency of the wind turbine blade; segmenting the wind turbine blade to obtain a plurality of blade sections; calculating a vortex shedding frequency of a cross section of each of the plurality of blade sections at different wind speeds or under different operating conditions; and determining at least one vortex-induced resonance region of the wind turbine blade by comparing the vortex shedding frequency of the cross section of each of the plurality of blade sections at different wind speeds or under different operating conditions with the natural frequency.

A method for detecting interference between a transducer of acoustic signals and a sensor having a mechanical resonance frequency with a frequency band that includes transmitting an acoustic signal within a known range of frequencies, in a sequence during a predetermined time window, monitoring the output signal from the sensor within said time window, comparing the transmitted signal with the sensor output signal and detecting deviations in the sensor output signal corresponding to frequencies in the acoustic signal, and determining the acoustic frequencies interfering with the sensor signal. A system for detecting interference including a transducer, configured to emit a sequence of acoustic signals, and a sensor configured to produce an output signal, an analysis unit adapted to monitor said output signal with the acoustic signal.

The invention provides a quartz crystal microbalance resonant frequency detection system, a control method and a terminal, a direct digital frequency synthesis excitation unit is adopted to generate a frequency sweep excitation signal with a preset frequency range and stepping, and the frequency sweep excitation signal is conditioned by a signal injection and conditioning unit and then injected into a QCM sensor. And then the pure amplitude response detection unit measures and quantifies voltage response amplitudes of the QCM sensor under different excitation frequencies, and the resonant frequency intelligent determination unit determines the resonant frequency of the QCM sensor according to the voltage response amplitudes. According to the invention, a QCM self-oscillation circuit does not need to be designed and debugged, a precise phase detection assembly does not need to be configured, the circuit board layout is simpler, and components are greatly reduced. The QCM resonant frequency can be accurately measured only through efficient amplitude detection, a complex algorithm is avoided, the operational capability requirement and the software development difficulty are reduced, the QCM resonant frequency measuring device has the advantages of being simple in structure, low in cost, easy to integrate and the like, miniaturization and low-power-consumption design can be easily achieved, and the QCM resonant frequency measuring device is suitable for portable and wearable application.

The invention relates to a method for rapidly measuring the resonant frequency of a resonant cavity based on frequency spectrum polynomial fitting, and belongs to the technical field of acoustic / optical measurement. The objective of the invention is to solve the problems of tedious steps, low efficiency, long time, poor stability and the like of a resonant cavity or resonant photoacoustic cavity resonant frequency measurement method. According to the method, the frequency spectrum of the resonant cavity is obtained through frequency mixing excitation, the frequency is obtained after curve fitting is conducted on frequency spectrum data points through a frequency spectrum polynomial fitting algorithm, and then resonant frequency measurement of the resonant cavity is achieved. According to the method, the measurement time of the resonant frequency of the resonant cavity is remarkably shortened, the measurement steps are simplified, and the measurement precision is improved; meanwhile, the resonance frequency is solved through frequency spectrum polynomial fitting, data noise interference can be effectively reduced, and the method has higher robustness. All frequency signals within the resonant frequency drift range are transmitted at a time through frequency mixing excitation, one-by-one scanning is not needed, and therefore the method has the advantages of being good in real-time performance, high in response speed, high in precision and the like, and is suitable for rapid frequency calibration and real-time monitoring in the fields of acoustic resonators, resonant photoacoustic spectra and the like. And a novel method for measuring the resonant frequency is provided for the fields of high-sensitivity resonance photoacoustic spectroscopy, acoustic trace gas detection and the like.

Disclosed herein is a system and method for optimizing RF power delivery to a plasma process chamber. This invention utilizes a data-driven approach to determine resonant frequencies for various plasma states, eliminating the need for conventional PID controls. By collecting performance data from an RF power generator as a function of operating frequency during the process recipe execution and analyzing portions of the waveform, the system continuously identifies resonating frequencies for each plasma state. Consequently, the RF power generator adapts in real-time to deliver optimal stability and performance.

The invention relates to the technical field of micro-nano-scale dynamic testing, and discloses a high-rigidity cantilever beam oscillation starting device, which comprises a cantilever beam placing frame, an oscillation starting device and a vibration starting device, the displacement module is provided with an experiment probe used for being in contact with the high-rigidity cantilever beam; the downward pressing control module is connected with the displacement module and used for controlling the experiment probe to execute downward pressing loading action so as to enable the high-rigidity cantilever beam to deform and then execute rapid separation action; and the data acquisition module is used for acquiring a free vibration signal generated by the high-rigidity cantilever beam after the experimental probe is separated from the high-rigidity cantilever beam. A set of experimental device combining a displacement table, piezoelectric ceramics and an experimental probe is designed. The displacement table has multi-degree-of-freedom and high-resolution displacement output capacity, the experimental probe can be quickly moved to a target area, piezoelectric ceramics are high in response frequency and high in stretching speed, and remarkable deformation can be generated in a short time.

The present application relates to the technical field of compression spring resonance frequency detection, and specifically relates to a compression spring resonance frequency detection method and system, the method comprising the following steps: collecting a mixed vibration signal of a compression spring to be measured; collecting a background noise signal of a test device as a reference noise signal; collecting a synchronous signal of a specific noise source of the test device; performing adaptive noise cancellation processing on the mixed vibration signal, the adaptive noise cancellation processing performing initial parameter training using the reference noise signal and using the noise source synchronous signal as a real-time reference input to separate a pure vibration response signal of the compression spring to be measured; performing frequency spectrum analysis on the pure vibration response signal; identifying a wideband vibration response region of the compression spring to be measured, the wideband vibration response region having a continuous amplitude higher than a preset energy threshold and having a specific width; calculating a characteristic parameter of the wideband vibration response region; and judging a degradation state of the compression spring to be measured according to the characteristic parameter. The above improves the accuracy of degradation judgment.

Some electric hair cutting devices have a stationary blade, a reciprocating blade, and an oscillating motor. Oscillating motors include pivot motors and linear motors. Both motors have a stator, an armature and at least one spring. The armature drives a load such as the reciprocating blade. The armature, the spring and the load have a mechanical resonant frequency. An H- bridge is supplied with pulse width modulated (PWM) signals from a controller and converts direct current from a battery to alternating current having the frequency of the PWM signals. The controller measures the mechanical resonant frequency when power to the motor is turned off and the armature continues to oscillate due to stored energy. The controller adjusts the frequency of the PWM signals to the measured mechanical resonant frequency and stores it in a memory for use the next time the motor is turned on.

A method for identifying the dynamic behavior of a non-rigid object (10), the object being fixedly attached to a platform (12) that can be set in motion by an actuation device (14) is proposed. The method comprises actuation of the drive device (14) so ​​as to impart to the object a predefined periodic movement at a frequency, called the "cycle frequency". The periodic movement is a combination of at least two geometrically independent periodic elementary movements. The method comprises recording during actuation the variation of at least one quantity representative of a dynamic behavior, called the "dynamic quantity", and calculating for each of the cycle frequencies of the components called "elementary components", a Fourier transform of the variation of said at least one dynamic quantity for each elementary frequency.A dynamic behavior of the object is determined based on the variation of the elementary components. Abstract figure: Figure 2.

The application discloses a method, device and equipment for determining a resonant frequency. The resonant frequency of a first vibration component under the driving of a first excitation signal is detected to obtain a first resonant frequency. A first frequency offset is obtained based on the first resonant frequency and a first driving frequency of the first excitation signal. The first frequency offset is mapped to a second frequency offset based on a target mapping relationship, which is a mapping relationship between an actual frequency offset and a detected frequency offset. The first driving frequency is compensated by the second frequency offset to obtain a target resonant frequency, which is an actual resonant frequency of the first vibration component, so that the resonant frequency of the vibration component can be determined quickly and accurately.

Anomaly analysis is performed for a subsystem or component of a vehicle that experiences mechanical vibration during rotation of the subsystem or component using a database of trends of the axis of rotation and trends of vibrational frequencies of a plurality of different subsystems or components with known anomalies, and an artificial intelligence (AI) model. In operation, a first processor triangulates a location of the axis of rotation of the subsystem or component of the vehicle at any instance of time using motion data collected from a plurality of motion measurement sensors that are attached to the subsystem or component, thereby defining locations of the axis of rotation at a plurality of successive instances of time. A second processor determines, using the AI model and the trends of the axis of rotation in the database, points of interest from the locations of the axis of rotation of the subsystem or component at the successive instances of time. The anomaly of the subsystem or component is identified using the AI model and the trends of the axis of rotation and trends of vibrational frequencies in the database, wherein the AI model uses the points of interest in its processing. One or both of a cause of the anomaly and a recommended corrective action to be taken to address the anomaly is generated using the AI model, wherein the AI model uses the identified anomaly of the subsystem or component in its processing. The AI model outputs one or both of the cause of the anomaly, and the recommended corrective action to be taken to address the anomaly.

The invention relates to a method for detecting at least one target, implemented using a detection system which includes a measuring device (1_A, 1_B) comprising a mechanical oscillator (11_A, 11_B) and a fluidic circuit (10_A, 10_B) integrated into the oscillator and in which a fluid containing said at least one target to be detected is made to circulate, said oscillator (11_A, 11_B) being capable of being excited according to several vibration modes (M_1, M_2, M_3) and comprising on the fluidic network at least a first trap positioned on an antinode of a first vibration mode of the oscillator and a second trap positioned on an antinode of a second vibration mode of the oscillator, an antinode of vibration corresponding to a position in which the vibration amplitude goes from 80% to 100% of the maximum amplitude for the selected vibration mode.

The invention relates to a method for machining a watch or jewelry component (20) by cutting material, comprising the steps of: - obtaining a support substrate (10), - positioning or clamping the support substrate (10) in a machine tool, - machining at least partially the watch or jewelry component (20), - applying a vibratory excitation to the watch or jewelry component (20) still attached to the support substrate (10), - measuring a vibratory response of the watch or jewelry component (20), to determine at least one characteristic of a resonance frequency, - providing said at least one resonance frequency characteristic to a machining prediction machine to determine or modify at least one machining step to be carried out before finishing the watch or jewelry component (20).

The present application relates to a kind of cable joint resonance real-time diagnosis method, equipment and medium, belong to power equipment condition monitoring technical field, wherein method includes the following steps: obtaining high-frequency current signal that high-frequency current sensor gathers and ultrasonic sensor array gathers ultrasonic vibration signal;High-frequency current signal and ultrasonic vibration signal are carried out signal synchronization, and high-frequency current characteristic and ultrasonic array characteristic are extracted;Based on high-frequency current characteristic and ultrasonic array characteristic, main frequency synchronism index, normalization phase stability index and nonlinear coupling index are calculated, and weighted summation is determined fusion confidence function;Based on fusion confidence function, judge whether there is resonance, if there is, then carry out resonance source positioning.Compared with prior art, the present application has the advantages of high precision, low false alarm, strong adaptation, is suitable for new energy grid-connected, urban smart grid, wind power and other key power system scenarios.

A device, a method, and a non-transitory storage medium are described in which a transducer validation service is provided. The service may include stimulating a piezoelectric transducer. The service may include measuring a signal output, which is responsive to the stimulus, from the piezoelectric transducer. The service may include evaluating the measured signal output to a reference voltage and determining whether the piezoelectric transducer is reverse-poled or not based on the evaluation. The service may further include determining a response to the determination when the piezoelectric transducer is reverse-poled.

A sensing device includes a sensor substrate, a Peltier element unit, a circuit board, a base body, a cover body, and a base cover. The Peltier element unit in contact with the sensor substrate. The base body includes a first recessed portion for housing a region of the Peltier element unit at a side of the heat dissipation surface, a second recessed portion for housing the circuit board, and a partition plate interposed between the first recessed portion and the second recessed portion. The cover body houses the base body in a region where the first recessed portion is formed, the Peltier element unit projecting outside the first recessed portion, and the sensor substrate, the cover body having an opening formed at a position corresponding to a region where the piezoelectric resonator is disposed for adsorption of the substance to be sensed.

The present application relates to the technical field of resonant frequency control, and particularly relates to a whispering gallery mode microcavity resonant frequency regulation method and system. The present application analyzes resonant frequencies, temperature data and resonant wavelength movement amounts at different monitoring moments, and obtains coupling influence degrees at each monitoring moment; according to resonant frequency distributions in a time neighborhood range of each monitoring moment, it is judged whether the time neighborhood range needs to be extended; if so, a target function of resonant frequency change rate is constructed in combination with a corresponding preset time extension amount; according to change trends of the preset time extension amounts in the time neighborhood ranges before and after the moment, and the coupling influence degree distributions of different monitoring moments in the preset time extension amounts, a restriction condition of the target function is constructed, and the preset time extension amount is obtained; and the regulation of the microcavity resonant frequency is realized. The present application obtains a suitable heating duration in the heat reflux regulation process, and improves the accuracy of the resonant frequency regulation.

Procedure, with the procedural steps: - moving a measuring probe of a coordinate measuring machine by moving at least one machine axis of the coordinate measuring machine assigned to the measuring probe; characterized by - Monitoring a vibration behavior of the measuring probe during movement of the measuring probe, wherein a vibration excitation in the direction of at least one measuring probe axis of the measuring probe is detected and compared with an axis-specific natural frequency of the measuring probe in the direction of the at least one measuring probe axis; - Adjustment of a dynamic influencing factor that influences the vibration behavior of the measuring probe, such as a measuring speed, a mass of the measuring probe or the like, provided that the vibration excitation is detected in the range of the axis-specific natural frequency.

The invention discloses a chain ring type pneumatic control device and a control method for a steel tube tower rod piece, and belongs to the technical field of power equipment.The chain ring type pneumatic control device for the steel tube tower rod piece comprises a chain ring and an identification system, the rod piece is sleeved with the chain ring, and the identification system is arranged in the chain ring; the recognition system comprises an acceleration sensor, an anemometer and a background computer, the acceleration sensor is attached to the rod piece, the vibration peak frequency fv0 of the rod piece is confirmed through the acceleration sensor, the anemometer is arranged on the peripheral face of the chain ring, the environment wind speed U is detected through the anemometer, and the vortex shedding frequency f is obtained through calculation; both the acceleration sensor and the anemometer can send signals to the background computer, the background computer compares the peak frequency fv0 with the vortex shedding frequency f to confirm a dominant frequency component fv, and the background computer presets the structural natural vibration frequency fn and an adaptive threshold value belonging to adapt, when fv-fnlt; when the number belongs to adapt, it is judged that a resonance risk exists, and the background computer gives an alarm; vibration is suppressed through the chain ring and is monitored through the recognition system.

The application provides a method for extracting the bulk acoustic resonant frequency of a resonator, which is based on the rate of change of the electric conductance obtained by deriving the electric conductance with respect to the frequency, to obtain the bulk acoustic resonant frequency of the resonator, which is equivalent to solving the noise problem and the problem that the bulk acoustic corresponding admittance value is relatively fuzzy in the corresponding relationship between the admittance and the frequency by using a mathematical calculation method, thereby improving the accuracy of the extracted bulk acoustic resonant frequency. Moreover, because it is based on the corresponding relationship between the measured admittance and the frequency, the reliability of the extracted bulk acoustic resonant frequency can be improved. In addition, it also has at least higher scalability and calculation speed.

The present disclosure is related to methods for determining a frequency of an oscillation mode of a wind turbine, comprising: determining a motion of a first mass of a first tuned mass damper in the wind turbine and deriving the frequency of the oscillation mode of the wind turbine at least partially based on the determined motion of the first mass. The present disclosure further relates to methods for operating a wind turbine, and to wind turbines, particularly offshore wind turbines, comprising tuned mass dampers.

The application provides a Coriolis flowmeter inherent frequency detection method, device and electronic equipment. The embodiment uses a sine wave sweep excitation signal with continuous frequency and phase changes to detect the inherent frequency of the Coriolis flowmeter, and eliminates problems such as poor anti-interference performance and harmonic interference caused by using equal-interval square wave signals to measure the inherent frequency of the Coriolis flowmeter. With the vibration characteristics of the flow tube in the Coriolis flowmeter derived, the frequency and phase of the sine wave sweep excitation signal used to drive the flow tube to vibrate are continuously changed, so that the interference of the external excitation signal itself on the flow tube vibration can be directly offset or reduced, the signal-to-noise ratio (SNR) is greatly improved, for example, the SNR is increased from 1db when the flow tube is excited by using equal-interval square wave signals to at least 18db by the method provided in the embodiment, the inherent frequency of the Coriolis flowmeter is accurately detected, and the anti-interference performance is enhanced.

The invention relates to a field device (1) for process automation. A control unit (2) stores data in a data memory (3) within specific time periods. This data is received via an interface (4) or generated by components (5, 5'). When the control unit (2) receives an output command, it outputs the stored data. The time periods relate to the manufacturing of the field device (1), the application of the field device (1), or the repair of the field device (1).