11 results about "Hertz" patented technology

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.

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.

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.