5results about How to "Achieve frequency" patented technology

A leaf tip timing signal spectrum reconstruction method based on delay sampling comprises the steps that leaf tip timing sensors collect leaf data, discrete Fourier transform is carried out on vibration displacement data, collected by each sensor, of each leaf, and an aliasing spectrum is obtained; according to a given amplitude threshold value, determining a to-be-reconstructed spectral clue index; spectral line aliasing conflict detection is carried out according to a given spectrum coefficient difference threshold value; determining a frequency spectrum folding frequency M according to the signal highest frequency prior, and further determining a possible target frequency corresponding to each spectral line to be reconstructed; calculating the least square solution of the real spectrum coefficient according to the aliasing spectrum coefficient and the possible target frequency, and calculating an estimation error; all possible target frequencies are traversed, the possible target frequency with the minimum estimation error serves as the final target frequency, and the least square solution corresponding to the possible target frequency serves as the real spectrum coefficient.

The utility model relates to industrial water chiller technical field discloses a kind of industrial water chiller with descaling structure, including cabinet, the inside of the cabinet is equipped with multiple circulation water pipes for water circulation, the top of the cabinet is equipped with the adding assembly for carrying out descaling liquid addition, the side of the adding assembly is equipped with the quantitative assembly for the quantitative addition of descaling liquid, the adding assembly includes the adding barrel arranged in the top of cabinet inner chamber, the bottom end of the adding barrel is fixedly connected with first adding pipe, the bottom end of the first adding pipe is fixedly connected with extrusion barrel, one end of the extrusion barrel is fixedly connected with second adding pipe;By setting adding assembly and quantitative assembly, the quantitative and frequency addition of descaling liquid are realized, the descaling effect is effectively improved, the equipment damage risk is reduced, the water quality stability in water chiller is guaranteed, the service life of industrial water chiller is prolonged, and the stable operation of industrial production system is guaranteed.

The application discloses a grid-connected type hybrid energy storage configuration of an off-grid hydrogen production system and a control method thereof, and relates to the technical field of renewable energy hydrogen supply. The system comprises a wind power generation unit, a photovoltaic power generation unit, a grid-connected type hybrid energy storage unit, an electrolytic cell unit and a controller. The wind power and the photovoltaic power generation are connected to an alternating current bus through a converter to provide renewable power for the system; the hybrid energy storage unit is composed of a super capacitor and a lithium battery, and is connected to the alternating current bus in a bidirectional mode through an energy storage converter; and the electrolytic cell is connected to the alternating current bus through an AC / DC converter. In the control method, the frequency of the alternating current bus is detected in real time, a frequency modulation dead zone is set, the super capacitor and the lithium battery are controlled to participate in frequency modulation adjustment in a time-sharing mode, and the frequency stability of the system and the continuity of electrolytic hydrogen production are ensured. The application has the advantages of fast frequency response capability, grid-connected operation capability and high-efficiency hydrogen production performance, and is suitable for the construction of green hydrogen energy systems in remote areas and in scenes without power grid access.

The application provides a silicon photon gyroscope stable control method and silicon photon gyroscope under a rapid temperature changing condition, and the stable control method comprises the following steps: setting a light source frequency control digital interval; controlling the light source temperature to make the light source center frequency enter a resonance valley, and recording the valley entering temperature; collecting the CW and CCW resonance signals output after the light source enters the resonance cavity, and calculating the sum of the clockwise and counterclockwise resonance frequency and the light source center frequency deviation; and calculating the feedback control light source current and temperature according to the light source frequency control digital interval where the sum of the frequency deviation is located. Through the adaptive control of the light source current and temperature, the light source center frequency can quickly track the resonance frequency of the resonance cavity under the rapid temperature changing condition, the stable control of the gyroscope is realized, and the gyroscope output accuracy is improved.

The utility model provides a kind of rapid optical frequency detection device, including the Michelson interferometer with one input light path, the Michelson interferometer has at least 2 interference arms, the interference arm tail is provided with the same mirror as the interference arm number, input light is reflected after entering interference arm Michelson interferometer, generates multipath output light, the output light is received by first photoelectric detector, and the first photoelectric detection signal generated is used to calculate the optical frequency variation of input light;One light path in the input light is input to wavelength division multiplexer, and the two light output by the wavelength division multiplexer is received by two second photoelectric detectors, and second photoelectric detection signal is generated to calculate the absolute optical frequency of input light.