6 results about "Hertz" patented technology

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 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 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.

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.