13results about How to "Achieve frequency" patented technology

This invention relates to the field of tunnel boring machine (TBM) guidance technology, and particularly to an alternating positioning type dual-shield TBM automatic guidance system and method. The system includes a guidance component connected to the dual-shield main control room for calibrating the positional relationship between the front shield and the support shield. The guidance component includes a first guide group for positioning the attitude of the front shield and a second guide group for positioning the step-changing attitude of the support shield. Both the first and second guide groups are signal-connected to the dual-shield main control room. This invention features a simple structure, novel and reasonable design. By using the first and second guide groups to alternately position the attitudes of the front shield and the support shield, it achieves long-distance automatic navigation, reduces or eliminates the frequency of manual station repositioning, significantly reduces workload, improves construction efficiency, and has promising application prospects.

The utility model discloses a photoelectric sensor pulse modulation circuit which comprises an RC charging and discharging circuit, a Schmitt trigger U2 and a photoelectric device driving circuit. The Schmitt trigger U2 is connected with the RC charging and discharging circuit, the Schmitt trigger U2 and the RC charging and discharging circuit are connected with the photoelectric device driving circuit, the RC charging and discharging circuit is used for generating oscillation time, and the photoelectric device driving circuit is used for driving a large-current device to operate. According to the utility model, the RC charging and discharging circuit is used for generating oscillation time; the arranged Schmitt trigger U2 is a NOT gate circuit and can realize level inversion; the photoelectric device driving circuit can be used for driving large-current devices such as a photoelectric sensor and the like; by means of the arrangement, the frequency and duty ratio modulation function of the photoelectric sensor is achieved, and frequency modulation is stable.

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 invention relates to a method for decoupling the morphology and resonant frequency of a contact resonance atomic force microscope. The method comprises the following steps: S1, preparing a microscope, a probe, a lock-in amplifier, a to-be-tested sample, a sapphire sheet and a PC (Personal Computer) upper computer; step S2, probe parameter calibration; s3, establishing a resonant frequency measurement device; s4, fixing the sample; s5, detecting the resonant frequency, collecting the test results of the appearance and the resonant frequency of the surface of the to-be-tested sample, and transmitting the test results to the PC upper computer; s6, data processing is carried out, and an inclination angle corresponding to a morphology result is calculated; drawing the corresponding relation between the resonance frequency # imgabs0 # and the inclination angle, and then solving the ratio # imgabs1 # of the lateral rigidity to the normal rigidity by adopting a probe-sample contact model; and then the # imgabs2 # is substituted into the probe-sample contact model, and each pixel point of a test result is reduced into an indentation modulus, so that decoupling of morphology coupling is completed.

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 invention discloses a multifunctional device based on nematic liquid crystal, which comprises an FR4 substrate, a liquid crystal interlayer and an F4B bottom plate, the FR4 substrate, the liquid crystal interlayer and the F4B bottom plate are connected in sequence, the FR4 substrate comprises an FR4 medium and a filtering feed network, and the FR4 substrate is connected with the liquid crystal interlayer at the lower end; the liquid crystal interlayer comprises a glass box and nematic liquid crystals, the nematic liquid crystals are located in the glass box, the upper end of the glass box is connected with the lower end surface of the FR4 substrate, and the lower surface of the glass box is connected with the F4B bottom plate; the F4B bottom plate comprises a copper ground and an F4B medium, the copper ground is located on the upper surface of the F4B medium, and the copper ground is connected with the lower end surface of the glass box. According to the invention, through temperature regulation and control, frequency reconfiguration and phase shift functions are realized, and the device has the advantages of low manufacturing cost, simple integration and simple phase modulation.

The invention relates to a balanced sideband separation radio frequency receiving device, which comprises a first radio frequency 90-degree coupler, a power divider, a second radio frequency 90-degree coupler, a third radio frequency 90-degree coupler, a frequency mixing module, a first magic T, a second magic T, an intermediate frequency 90-degree coupler and a load, and the 90-degree emitting end outputs a lower sideband signal. Compared with the prior art, the mixer, the magic T, the power divider, the radio frequency 90-degree coupler and the intermediate frequency 90-degree coupler are organically combined, separation of upper and lower sideband signals is achieved, simultaneous detection of the upper and lower sideband signals can be achieved, the upper and lower sideband signals are emitted from fixed ports, and system errors caused by discrete observation are effectively avoided.

The invention relates to the technical field of high-pressure common rail fuel pumps of diesel engines, and discloses a fatigue test device for high-pressure oil inlet valve matching parts, a detection tool assembly is mounted in a frame, and the detection tool assembly is used for fatigue detection of the high-pressure oil inlet valve matching parts; the matching part installation assembly is installed on the detection tool assembly and used for fixing a high-pressure oil inlet valve matching part. The control system assembly is arranged in the box body of the frame; one end of the detection pressure head penetrates through the interior of the insertion hole in the locking nut, so that fatigue detection can be carried out on the high-pressure oil inlet valve matching part; in the detection process, the force sensor feeds back a real-time value of force, the real-time value is transmitted to the industrial personal computer through the signal acquisition card, an output signal of the servo electric cylinder controller is adjusted in a closed-loop mode according to a program set in the industrial personal computer, and then a push rod of the servo electric cylinder drives the detection tool assembly to move up and down in a reciprocating mode according to a certain frequency and a certain force. Therefore, the constant-frequency and constant-force value fatigue test of the high-pressure oil inlet valve matching part is realized.

The invention discloses an online harmonic feature extraction method and system for multi-component periodic signal identification and a computer readable storage medium, and relates to the field of signal analysis and signal processing. The technical problems to be solved are that a periodic signal harmonic feature extraction method in the prior art is low in recognition precision, sensitive to noise, complex in decomposition process, poor in real-time performance and difficult to meet the signal online recognition requirement in a complex industrial control system. According to the technical key points, a wave trap with an adjustable center frequency is designed as an extreme value function, so that the purposes of dynamically identifying the frequency of a periodic signal and identifying and outputting the frequency of the periodic signal in real time are achieved; according to the invention, a band-pass filter with an adjustable center frequency is designed as an extreme value function, and a signal envelope and phase sensitivity detection composite module is combined, so that the amplitude of a periodic signal is dynamically identified, and the amplitude of the periodic signal is identified and output in real time. The method is used for effectively extracting the periodic signal output by the controller of the motor control system so as to identify the periodic interference.

The invention discloses a simulation vibration test platform based on an underwater pile hammer power station, and relates to the technical field of vibration testing, the simulation vibration test platform comprises a base, a power assembly, a vibration assembly, a damping and amplitude adjusting assembly and a rotation limiting assembly, the power assembly is arranged between the vibration assembly and the base, and the rotation limiting assembly is arranged between the vibration assembly and the base. The power assembly pushes the vibration assembly to move upwards, the vibration assembly is arranged at the top of the base and can carry the underwater power station to do free falling motion, the damping and amplitude adjusting assembly is arranged at the top of the base, and the damping and amplitude adjusting assembly limits and adjusts the distance of free falling. The damping and amplitude adjusting assembly simulates the primary damping effect of the underwater pile hammer, the rotation limiting assembly is arranged between the vibration assembly and the base, and the rotation limiting assembly is used for limiting relative rotation between the vibration assembly and the base. The device is installed.

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.