19 results about "Hertz" patented technology

The invention provides a method for detecting furfural in insulating oil based on terahertz time-domain spectroscopy, and relates to the technical field of aging detection of insulating oil of electrical equipment, and the method comprises the following steps: determining the content of furfural in insulating oil in different aging states through a chromatographic analysis method, and preparing samples with corresponding concentrations; the method comprises the following steps: scanning a sample by using a transmission-type terahertz time-domain spectroscopy system according to liquid characteristics and terahertz spectral characteristics of the insulating oil to obtain time-domain spectral data of the sample; adopting a quantum chemistry simulation method to simulate absorption and reflection characteristics of furfural molecules in a terahertz frequency band, and matching a vibration mode, a rotation energy level and terahertz wave band absorption characteristics in a real spectral signal; and the content of furfural in the insulating oil is quantitatively detected by reconstructing the terahertz time-domain signal. According to the method, rapid and non-contact detection of trace furfural in the insulating oil is realized by analyzing the terahertz spectrum characteristics, and an effective evaluation means is provided for the insulation aging degree of the transformer.

The invention discloses a multi-photon phase detection method, device and system based on closed-loop quantum coherence and clock transition, and aims to solve the problems that the working frequency of an existing atom sensor is limited and the existing atom sensor is easily interfered by amplitude noise. According to the method, a closed ring is constructed in an atomic medium by applying a light field, a working alternating-current magnetic field and an auxiliary alternating-current magnetic field. The sum of the working frequency and the auxiliary frequency is set to be equal to the transition frequency of the first-order magnetic insensitive clock of the atom, so that decoupling of the working frequency to be measured and the inherent frequency of the atom is realized, and continuous tuning can be performed in a broadband range from Hertz to gigahertz. To-be-measured phase information is carried in a global phase of a closed loop, and is extracted by measuring an optical response signal and performing synchronous demodulation. According to the scheme, the self-consistency of the closed loop phase and the stability of clock transition are utilized, the influence of driving field amplitude noise and environment magnetic field fluctuation is effectively restrained, and the method is suitable for the fields of high-precision electromagnetic detection, broadband communication and the like.

The application discloses a gear time-varying meshing stiffness measurement method, which comprises the following steps: S1, a measurement model between current and time-varying meshing stiffness is established based on Hertz contact theory and Ishikawa formula; S2, a closed circuit is formed by connecting a driving gear, a driven gear and a power supply in series, and time-varying current of the circuit is measured; and S3, the time-varying current measured in S2 is substituted into the measurement model to obtain time-varying meshing stiffness of the gear. The application improves the measurement precision and efficiency of the gear time-varying meshing stiffness.

This invention discloses an on-demand metal jet forming method based on forced vibration, belonging to the field of 3D printing technology, including the following steps: Step 1, calculating the resonant frequency f of the molten metal column in the nozzle. n Step 2: Determine the excitation frequency f of the forced vibration system; Step 3: Input an excitation signal with frequency f into the forced vibration system, which drives the nozzle to vibrate axially; The forced vibration of the nozzle includes an unstable start-up stage and a stable stage. After the nozzle vibration enters the stable stage, a stable metal droplet jet with frequency f is generated; Step 4: After obtaining the stable metal droplet jet, the base plate is subjected to three-dimensional motion, and metal deposition is performed using the metal droplet jet to complete the forming of the metal component. The spraying frequency of this invention can reach tens of thousands of hertz, which can greatly improve the manufacturing efficiency of droplet-spraying metal additive manufacturing.

A device includes a substrate including a first layer and a second layer. The first and second layers are positioned adjacent to each other and comprise a common boundary region extending from the first layer to the second layer. The first layer comprises graphite with a Bernal-crystal structure. The second layer comprises graphite with a rhombohedral crystal structure. The boundary region includes a border region having superconducting properties, namely; at a current density of 0 Ampere / m2 and a magnetic flux density of 0 Tesla exhibiting a critical temperature (Tc) which is higher than −195° C., and / or at a temperature below the critical temperature (Tc) and a current density of 0 Ampere / m2, exhibiting a critical magnetic flux density (Bk) that is higher than 1 Tesla. The border region is coupled to an electric and / or a magnetic and / or an electromagnetic signal with a frequency greater than or equal to 0 Hertz.

The invention discloses a high-quality terahertz signal adjusting method. The method comprises the following steps: firstly, controlling a delay position of a delay line to move to a position where the amplitude of a terahertz signal is maximum by using control software, and displaying the amplitude of the signal; then, the three-dimensional precise moving platforms of the photoconductive excitation antenna, the terahertz lens I, the terahertz lens II and the photoconductive detection antenna are repeatedly and sequentially adjusted, so that the amplitude of the terahertz signal reaches the maximum; then sequentially moving a certain one-dimensional position of a three-dimensional precision platform of a photoconductive excitation antenna, a terahertz lens I, a terahertz lens II and a photoconductive detection antenna with a relatively small fixed value, recording, and collecting and storing terahertz spectrum data when moving a fixed value every time; comparing all the stored terahertz spectrum data to obtain the position of each three-dimensional precision platform when the terahertz spectrum range is widest; and moving the three-dimensional precision platform according to the recorded position and collecting a terahertz signal. The terahertz signals acquired through the steps have high signal quality.

The invention discloses a pure tone audiometry transducer automatic calibration method and system, and relates to the technical field of transducer automatic calibration, and the method comprises transducer basic detection, transducer basic calibration and transducer accurate calibration; firstly, whether the transducer needs to be calibrated is judged by using data, if the transducer needs to be calibrated, pure tones of test input decibels of fault Hertz are sent to earphone corresponding interfaces on an earphone frame through an earphone, and output decibels corresponding to the test input decibels of the fault Hertz at the input end and the output end of the transducer are collected through a sensor; according to the automatic calibration method, the output power calibration multiplying power and the sensitivity calibration multiplying power are calculated, basic calibration is carried out on the basis, the use data of the calibrated transducer are analyzed, accurate calibration is carried out, the calibration efficiency is improved, the complexity of manual operation and the possibility of errors are reduced, and the calibration accuracy is improved. And the calibration process of the transducer is more standardized and normalized.

The invention discloses an on-demand metal jet spray forming method based on forced vibration, which belongs to the technical field of 3D printing, and comprises the following steps: step 1, calculating the resonant frequency fn of a molten metal liquid column in a spray pipe; 2, determining the excitation frequency f of the forced vibration system; 3, an excitation signal with the frequency of f is input into the forced vibration system, and the forced vibration system drives the spray pipe to conduct forced vibration in the axial direction; the forced vibration of the spray pipe comprises an unstable vibration starting stage and a stable stage, and after the vibration of the spray pipe enters the stable stage, a stable metal droplet jet flow with the frequency of f is generated; and 4, after the stable metal droplet jet flow is obtained, the bottom plate is made to move in a three-dimensional mode, metal deposition is conducted through the metal droplet jet flow, and forming of the metal component is completed. The spraying frequency can reach tens of thousands of hertz, and the manufacturing efficiency of molten drop spraying type metal additive manufacturing can be greatly improved.

This invention presents a GNSS-based all-zero Doppler guidance method considering SAR installation deviations. First, it obtains the satellite's position and trajectory velocity components in the WGS84 coordinate system from the GNSS system and calculates the satellite's inertial velocity component in the WGS84 coordinate system. Then, it calculates the satellite's trajectory velocity component in the orbital coordinate system. Based on the imaging target's downward viewing angle, and ideally the satellite's range and azimuth installation angles in the spaceborne SAR beam, it calculates the ideal yaw, pitch, and roll guidance angles. Subsequently, based on the on-orbit calibrated installation deviations of the spaceborne SAR, it corrects the roll, yaw, and pitch guidance angles, and guides the satellite's attitude according to the corrected results. This invention enables real-time calculation of the satellite's roll, yaw, and pitch guidance angles even with installation deviations in the spaceborne SAR, thereby correcting the SAR beam center Doppler frequency to near zero Hertz.

This invention discloses a two-stage fractional-number coordinated Asia-Pacific Hertz frequency synthesizer, comprising: a first-stage fractional-number phase-locked loop (PLL) that improves the resolution of the reference signal through low-precision fractional-number division to meet the condition of no blind zone, and uses a digital time converter to eliminate quantization noise caused by fractional-number division to generate a local oscillator signal; and a second-stage fractional-harmonic mixing PLL that improves the resolution of the local oscillator signal through high-precision fractional-number division to achieve arbitrary frequency point generation, and uses multi-path retiming to cancel quantization noise technology to eliminate quantization noise caused by fractional-number division, mixes and filters the high-frequency fundamental signal and the local oscillator signal to generate an intermediate frequency (IF) signal, performs frequency and phase discrimination and weighted summation on the IF signal and the multi-path retiming processed signal respectively to generate a quantization noise-compensated current signal, controls the harmonic extension VCO after low-pass filtering to generate a high-frequency fundamental signal, and generates an Asia-Pacific Hertz band output signal based on the high-frequency fundamental signal.

The invention discloses a linear ball guide rail multi-ball independent feeding process load deformation prediction method, which comprises the following steps: acquiring basic parameters of a linear ball guide rail, determining a class stiffness coefficient according to a Hertz contact theory, and constructing a multi-ball independent load deformation model; measuring characteristic parameters of the guide rail raceway, and establishing a characterization function of the surface topography; substituting the representation function into a multi-ball independent load deformation model to obtain a prediction result of the load deformation of the linear ball guide rail in the feeding process; measuring a vibration signal in the feeding process of the linear ball guide rail under an actual working condition, comparing a prediction result with frequency domain data of the vibration signal under the same working condition, and iteratively updating a representation function of the surface topography of a guide rail raceway and a multi-ball independent load deformation model; and outputting the load deformation prediction model of the linear ball guide rail and the representation function of the raceway surface morphology in the feeding process. By means of the method, high-precision prediction of the loaded deformation of the linear ball guide rail in the feeding process can be achieved.

The present invention discloses a method for estimating the life of an aviation fuel gear pump based on gear failure, which relates to the technical field of gear pump life estimation. The method includes synchronously collecting parallel and vertical polarization vibration signals and performing baseline correction and low-pass filtering. The method calculates the dynamic contact stress of the tooth surface by combining smoke scattering spectra, gear material parameters, and Hertz contact theory to construct a multi-physics field data set. The method extracts the degree of polarization, polarization angle, stress change rate, and smoke concentration change from the multi-physics field data set to generate a node feature vector sequence. The method also fuses the dynamic graph embedding vector with the modified Hertz contact term and Archard wear term to construct a physically constrained neural differential equation. The method rigidly embeds the modified Hertz contact term and Archard wear term into the neural differential equation and uses the Dormand-Prince solver to iteratively generate the state evolution trajectory, ensuring that the model adheres to both data-driven laws and physical conservation constraints.

The present application relates to the technical field of underground pipeline detection, in particular to a Hertz signal digitization method and system for underground pipeline detection. A stable Hertz frequency digital detection excitation signal is generated by using the phase accumulation mechanism of DDS (direct digital synthesis) technology and digital interpolation translation; a controllable random jitter frequency division strategy is introduced to generate multiple sets of single frequency point voltage signals to reduce spectral aliasing and background noise; the response signal is sampled and filtered by a high-precision ADC and an adaptive FIR low-pass filter; the target underground pipeline is detected, analyzed and alarmed by combining wavelet sub-band frequency band energy normalization analysis and feature vector construction. The present application can digitize the 512 Hertz analog signal of traditional underground pipeline detection, greatly improving the sensitivity, anti-interference ability and signal processing accuracy of underground pipeline detection.

The invention relates to the technical field of medical equipment, and discloses ten-billion-hertz overclocking micro-seismic equipment which comprises a shell, an overclocking generating device is arranged in the shell, and an inner film is arranged at the end, located at the overclocking generating device, of the interior of the shell. Through the overclocking generation device, extremely high frequency waves with fixed frequency can be continuously and stably emitted, the energy range of the waves is close to the vibration energy level of molecular hydrogen bonds, the dynamic structure of water molecular clusters can be influenced, a hydrogen bond network of urate crystals can be loosened through the resonance effect, and dissolution of the hydrogen bond network is promoted; when gout is in acute attack, the activity of immune cells can be adjusted through extremely-high-frequency waves generated by the overclocking micro-vibration equipment, release of inflammatory factors is reduced, and the effect of relieving red, swollen and heat pain is achieved; the non-thermal effect is achieved through extremely-high-frequency waves generated by the overclocking micro-vibration equipment, the function of the inner wall of a blood vessel is affected, local blood circulation is promoted, and excretion of uric acid is accelerated.

A method of detecting a sag value of a weighting material in a drilling fluid in a borehole by injecting an alternating current into the drilling fluid in a frequency range of 0.1-10,000 hertz (Hz) over a time period of 1-6 hours. The method includes measuring real-time data of a real conductivity and an impedance of the drilling fluid based by spectral induced polarization (SIP) of the drilling fluid in the borehole and / or during the injecting. Calculating a first density and a second density of the drilling fluid at a first elevation and a second elevation, respectively, each based on a variation in the real conductivity and the impedance, and calculating the sag value of the weighting material in the drilling fluid based on the first and second densities.

The invention provides a radial ultrasonic-assisted micro-forging surface strengthening device, and relates to the field of machining, and the radial ultrasonic-assisted micro-forging surface strengthening device is characterized in that a micro-forging system is used for generating low-frequency large-amplitude impact motion, and an ultrasonic impact system is used for generating high-frequency small-amplitude impact motion; and axial output generated by the micro-forging system is compounded with radial output generated by the ultrasonic peening system. The punch, the ultrasonic connecting piece and the horizontal sliding block are sequentially connected and are driven by the connecting rod to do radial motion, and the ultrasonic connecting piece, the vertical sliding block and the ultrasonic amplitude-change pole are sequentially connected and are driven to do axial motion. The micro-forging system and the ultrasonic impact system are combined, the axial low-frequency large-stroke impact motion (hundreds of hertz and millimeter-level stroke) of the punch driven by the electromagnetic system and the radial high-frequency small-stroke impact motion (tens of thousands of hertz and micron-level stroke) driven by the ultrasonic system are achieved at the same time, and parts are strengthened more effectively.

The invention provides a terahertz guided-mode resonance resonator and a rapid PCR detection system and method.The terahertz guided-mode resonance resonator comprises a substrate and a metal grating structure arranged on the substrate, the substrate comprises a first substrate and a second substrate which are parallel to each other, and a cavity is formed between the first substrate and the second substrate; the metal grating structure comprises two layers of metal gratings formed by periodically arranging the same metal, and the two layers of metal gratings are respectively arranged on the outer surfaces of the first substrate and the second substrate; the invention has the following beneficial effects: the terahertz technology is combined with the guided-mode resonance resonator technology, and rapid melting of RNA base fragments is realized through terahertz waves transmitted by the terahertz wave transmitting module; and the unlinking process is detected by utilizing the resonance coupling effect of light observed by a terahertz probe in the terahertz guided-mode resonance resonator and the terahertz detection module and the resonator, so that rapid PCR detection is realized, and the PCR detection speed and accuracy are remarkably improved.

A terahertz spectrometer includes a terahertz-wave emitter and a terahertz receiver elements. The terahertz wave generated by means of generating beat frequency corresponding to the difference between two rapidly tunable continuous wave lasers. A difference in time exists between the interrogating signal and the reference signal at the receiver end side, which corresponds to intermediate frequency (IF), not centered around the baseband, i.e. zero Hertz. The offset step size of the intermediate frequency from zero Hertz is linearly correlated to the position of the interrogated object position.

This invention discloses a Hertz signal digitization processing system for underground pipeline detection, relating to the field of electromagnetic detection technology. The system verifies the transmission frequency to generate an injection time series, collects and calculates time differences, amplitude mapping, and bandwidth diffusion sorting to obtain response coefficients, classifies and marks frequencies to remove end-point and front-end superimposed duplicates, and reconstructs adjacent frequencies by splitting and reassembling. It screens for frequency differences between adjacent sampling points to screen for anomalies and filter continuous segments, and uses three-point grouping and matching to calculate amplitude changes and generate trajectory coordinates from the center point. This Hertz signal digitization processing system for underground pipeline detection, by verifying the relationship between the output frequency and a preset frequency band, and by splitting the frequency into numbered frequency injection time series with output durations using a fixed step size, ensures that the transmitting frequency is no longer limited to a single setting or coarse scanning. It also incorporates arrival time, energy changes, and bandwidth expansion information, enhancing the ability to distinguish between medium attenuation, path deflection, and local anomalies.