46results about How to "Reduce external distractions" patented technology

The invention provides a wireless communication and computing resource collaborative optimization method and system. The method provided by the invention comprises the following steps: establishing an initialized global model matched with a business demand for each service provider, and matching service resources of each service provider according to the business demand; establishing a service agent corresponding to each service provider; each service agent generates an optimal strategy based on the corresponding service resources and the state information of other service providers; sending the initialized global model to a distribution client according to an optimal strategy; each distribution client trains the received to-be-trained model based on the distributed service resources, and sends the trained model to the corresponding service provider; and aggregating the received trained models by each service agent to obtain a global model of the corresponding service. The method and the system provided by the invention are used for realizing collaborative optimization of wireless communication and computing resources and improving the overall performance and the resource utilization efficiency of federated learning.

The invention relates to the technical field of unmanned aerial vehicle path control, and particularly discloses an unmanned aerial vehicle power grid inspection operation path planning method based on Beidou navigation, and the method comprises the steps: obtaining the historical inspection contribution value of each region of a power grid, and combining the actual operation state contribution value of each region of the power grid; determining an unmanned aerial vehicle power grid inspection operation priority value of each region of the power grid, determining an unmanned aerial vehicle power grid inspection operation initial path, determining an unmanned aerial vehicle power grid inspection operation height of each region of the power grid, and obtaining obstacle position coordinates of a connection path of each region of the power grid based on Beidou navigation; according to the method, the problems that a traditional path planning method cannot meet efficient and intelligent routing inspection requirements and is insufficient in dynamic optimization capability in combination with real-time data are solved, the routing inspection effectiveness is improved, and the routing inspection efficiency is improved. The flight risk of the unmanned aerial vehicle is reduced and the inspection task is smoothly carried out.

The invention relates to a low-temperature liquefied natural gas spray cooling performance test system and a test method, belongs to the technical field of low-temperature fuel spray cooling, and solves the problem that a test system and a test method for taking liquefied natural gas fuel as a spray cooling material are lacked in the prior art. And the performance of the liquefied natural gas fuel as the spray cooling material cannot be accurately analyzed. The test system comprises a double-layer structure spraying chamber, a nozzle, a heat source and a data acquisition system, lNG mist sprayed by the nozzle flows in the inner space of the double-layer structure mist spraying chamber; liquid nitrogen flows in the interlayer space of the double-layer structure spraying chamber and is used for low-temperature cooling of LNG spraying. According to the test system, a double-layer heat preservation structure is adopted, and the LNG partially gasified due to storage and transportation can be cooled by using low-temperature liquid nitrogen, so that the phase change heat absorption capacity of the LNG is exerted in spray cooling. And meanwhile, the influence of the external environment on the test result can be well isolated, and the external interference is reduced.

The invention relates to the technical field of vibration testing of structural components, in particular to a performance testing device, method and system for a steel framework. The method comprises the following steps: firstly, acquiring all vibration signal components of a vibration signal of each measuring point of a bridge steel framework under each external excitation and all vibration peaks in the vibration signal components; then, clustering vibration peaks in each vibration signal component, obtaining a periodic index of the vibration peak in each cluster, segmenting each vibration signal component, obtaining all component sub-segments, and further obtaining a representative coefficient of each vibration signal component; and then screening out the vibration characteristic component of the vibration signal of each external excitation at each measuring point, thereby facilitating the final evaluation of the performance of the bridge steel framework. Based on the characteristic that the vibration signal under the external excitation has the periodic vibration characteristic, the corresponding vibration characteristic component is analyzed and screened out, the interference of other random vibration factors such as environment or traffic is reduced, and the performance of the bridge steel framework is accurately evaluated.

A rotor magnetic tile pasting device comprises a working table, a rotary table is arranged on the working table, a rotor clamp is arranged on the rotary table in the circumferential direction, a dispensing mechanism, a magnetic tile pasting mechanism and a magnetic tile pressure maintaining mechanism are arranged above the rotary table, a magnetic tile feeding mechanism is arranged on one side of the magnetic tile pasting mechanism, and the magnetic tile pasting mechanism comprises a pressing disc; a lifting assembly is arranged at the upper end of the crimping disc, magnetic shoe positioning grooves are formed in the lower end face of the crimping disc, magnetic shoe guide grooves are formed in the outer sides of the magnetic shoe positioning grooves, the bottoms of the magnetic shoe positioning grooves and the bottoms of the magnetic shoe guide grooves are communicated through sliding block guide grooves, and ferromagnetic sliding blocks reciprocating in the horizontal direction are arranged in the sliding block guide grooves; a positioning ring made of a non-magnetic material is further arranged below the pressing disc, and a catalyst adding device is arranged at the output end of the magnetic shoe feeding mechanism. The magnetic shoes are positioned and guided through the pressing disc made of the non-magnetic-conductive material, the ferromagnetic sliding block is used for driving feeding positioning of the magnetic shoes, and external interference borne by the magnetic shoes in the positioning process is reduced.

The invention discloses a turbonator rotor winding turn-to-turn short circuit fault online diagnosis method, and belongs to the technical field of generators. The device comprises a U-shaped iron core, an insulating shell, a coil, a lead and a data acquisition device. In order to solve the problem that the installation difficulty of a sensor in a casing is large, and based on the phenomenon that a main magnetic field generates an overflow effect due to the ferromagnetism of a generator stator casing, the open iron core tightly attached to the stator casing is used for forcibly draining leakage magnetic flux; data acquisition and frequency domain analysis are carried out on the induced voltage of the coil wound on the U-shaped iron core, k / p (k = 1, 2, 3..., k is not equal to np, and n = 1, 3, 5...) fractional and even harmonic waves are extracted as fault characteristic harmonic waves, and the characteristic harmonic wave content is compared with a normal threshold value to detect the turn-to-turn short circuit fault of the rotor winding. Operation is easy and convenient, and safe operation of the unit is not affected; the anti-interference effect is better, the safety is high, the operation is convenient, and the diagnosis is accurate.

The invention relates to the technical field of current sensors, in particular to a double-air-gap high-precision high-range current sensor which comprises two Hall chips and an MCU controller, the two Hall chips are used for outputting magnetic field signals into two paths of electric signals, the MCU controller is used for collecting and processing output signals of the Hall chips, and the MCU controller is used for controlling the Hall chips to output the output signals. Averaging the output signals of the two paths of Hall chips; and by adopting the design of averaging output of the two Hall chips, the accuracy and the stability of measurement can be improved. By averaging the output signals of the two Hall chips, measurement errors caused by factors such as errors and temperature drift of the chips can be reduced; the double-air-gap high-precision high-range current sensor provided by the invention can maintain good performance when being influenced by external temperature and humidity, and solves the technical problem that the accuracy and stability of a double-air-gap current sensor in the prior art become poor due to the fact that the double-air-gap current sensor is easily influenced by external temperature and humidity.

The invention discloses a flow data processing method applied to a small-caliber pipeline, and belongs to the technical field of ultrasonic flow measurement. The invention discloses a flow data processing method applied to a small-caliber pipeline. The flow data processing method comprises smoothing processing, Kalman filtering and zero drift processing. Flight time data are obtained through a time-to-digital converter in the ultrasonic water meter, data smoothing processing and Kalman filtering are carried out on the flight time data so that measurement errors in the measurement process of the ultrasonic water meter can be reduced, and then a zero drift processing method is carried out. The external interference of the ultrasonic water meter at low flow and the instability of the water meter are reduced, so that the application range, the precision and the reliability of the measurement of the ultrasonic water meter can be effectively improved.

The utility model belongs to the technical field of motor vehicles and air filters, and particularly relates to an air filter, an engine system and a motor vehicle. The air filter comprises a shell and further comprises an air inlet pipe and an exhaust pipe which are connected to the shell. A filter element is arranged in the shell and divides the inner space of the shell into an air inlet cavity and an air outlet cavity. The air inlet pipe is communicated with the air inlet cavity, and air to be filtered is introduced into the air inlet cavity; the exhaust pipe communicates with the exhaust cavity, and air entering the exhaust cavity after being filtered by the filter element is led out. The air filter is further provided with an improved buffer connection structure and an exhaust pipeline. The air filter is durable and stable in filtering efficiency, low in operation noise, convenient to maintain and install and suitable for diversified use environments and conditions. On the basis, the utility model further provides an engine system and a motor vehicle.

The invention discloses a high-voltage reactor direct-current resistance measuring device integrated with a shielding device, and relates to the technical field of reactor direct-current resistance measurement. Comprising a shielding device and a measuring device. The measuring device comprises a direct current generator, a bypass resistor and a multi-order LC filter which are electrically connected with the high-voltage reactor, a current and voltage measuring circuit which is electrically connected with the bypass resistor and the multi-order LC filter, and an MCU control circuit which is electrically connected with the current and voltage measuring circuit. The shielding device is of a cover body structure and comprises internal insulating layers which are arranged layer by layer from outside to inside; the high-conductivity metal layer, the middle insulating layer, the high-permeability magnetic shielding layer and the internal insulating layer are detachably connected with the high-voltage reactor; the shielding device covers the measuring device and the high-voltage reactor, so that the measuring device and the high-voltage reactor are in a sealed state. The device can effectively suppress induced electric interference and reduce the influence of alternating current components on a measurement result, so that the accuracy and reliability of direct current resistance data are ensured.

The application provides an automatic system and an assembling method of double-line supply integrated assembly, which comprises a first supply line and a second supply line, the first supply line and the second supply line are collected to a positioning assembly output line through a robot taking materials, the first supply line comprises a multi-axis running feeding machine and a secondary positioning platform in sequence, the second supply line comprises a flying feeder, an adsorption material taking device, a clamping material taking device, a point laser height measuring instrument and an upper visual positioning scanning module are arranged on an execution end of the robot, the positioning assembly output line comprises a lower visual positioning module and a product circulation mechanism in sequence, a positioning installation station is arranged on the product circulation mechanism, a material positioning module and a material blocking module are arranged at the positioning installation station, and the execution end of the robot is matched with the flying feeder, the secondary positioning platform, the lower visual positioning module and the positioning installation station in sequence. Through the double-line supply cooperation, multi-stage visual positioning and full-process automation design, the efficiency bottleneck and the precision problem in the assembly of special-shaped parts are effectively solved.

The utility model relates to the field of sound box equipment, in particular to a sound box capable of realizing intelligent control with a light effect, which comprises a CPU (central processing unit) controller, a sound box power amplifier unit, a light illumination unit, a photoresistor control circuit and a mobile human body pyroelectric infrared sensor control circuit, the sound box power amplifier unit, the light illumination unit, the photoresistor control circuit and the mobile human body pyroelectric infrared sensor control circuit are all matched with the CPU controller, and the sound box can intelligently respond to environmental changes and human body movement signals through the core function of the CPU controller. The photoresistor control circuit and the mobile human body pyroelectric infrared sensor control circuit provide real-time data for the CPU controller, so that the CPU controller can accurately control the sound box power amplifier unit and the light illumination unit, and more intelligent use experience is provided for users.

The application relates to the technical field of intelligent automobiles, in particular to a double-winding motor steer-by-wire steering actuator, a system and an angle detection method, wherein the steering actuator comprises a connecting mechanism, a steering mechanism for transmitting a steering torque to the connecting mechanism to drive a wheel to steer, wherein no detection component is arranged on the steering mechanism, the detection component is used for detecting a steering angle of the vehicle, a speed reduction mechanism for transmitting the steering torque to the steering mechanism, and a double-winding motor for outputting the steering torque, wherein the steering mechanism comprises a first angle sensor and a second angle sensor, and the steering angle of the vehicle is calculated according to the rotor angle detected by the first angle sensor and / or the second angle sensor. Thus, the problems in the prior art that the steering actuator of the steer-by-wire system occupies a large space, has a large volume and a high cost, has a low fault tolerance rate, and cannot be processed according to the fault type after the steering angle fails, so that the vehicle driving safety cannot be ensured are solved.

The utility model discloses a coal mine tunnel geological exploration device which comprises a mobile vehicle body, a coal mine tunnel inner cavity electromagnetic exploration unit and an outer shielding shell, in the using process of the coal mine tunnel geological exploration device, a horizontal probe is installed in a horizontal transmitting tube, and the horizontal transmitting tube can effectively reduce external interference before signals are released; the horizontal probes which are annularly and uniformly distributed effectively transmit signals, and in order to reduce interference of external metal objects in the horizontal direction, the magnetic detection module installed on the surface of the horizontal transmitting tube can detect the metal objects in the surrounding area, so that the influence of the metal objects in the surveying area on surveying data in the horizontal direction is effectively reduced; due to the fact that the included angles formed by the first launcher, the second launcher and the third launcher change, the signal launching position interval is increased, the position and the water yield property of the geological anomalous body in front can be effectively deduced through multi-angle observation, the problem that the signal position is single in the surveying process is solved, and roadway geological surveying data collection is further guaranteed.

The present application relates to the technical field of float glass preparation, and specifically discloses a method for precisely controlling the thickness difference of float glass, comprising the following steps: S10, constructing a multi-layer composite heat preservation structure outside the water tank in the high-temperature zone of the tin tank of a float glass production line; S20, collecting the process parameters of the tin tank in real time, including the temperature field distribution, pressure parameters and the geometric parameters of the glass ribbon; S30, processing the process parameters using a field-adaptive deep learning algorithm to generate a control signal for the edge puller; S40, adjusting the angle, speed, strength and position parameters of the edge puller according to the control signal; S50, repeating steps S20 to S40 to form a closed-loop control cycle, and when the thickness difference of the glass is stabilized within the required range, entering a maintenance mode to reduce the calculation load. A stable temperature environment is provided by the heat preservation structure, the algorithm fully learns the special rules of glass forming, the glass process characteristics are deeply integrated into the control system design, and the precise control of the thickness difference is achieved.

The invention provides a photovoltaic device which can be installed on a building, and the photovoltaic device comprises a photovoltaic module which is arranged on the building and is provided with a wireless charging transmitting device; and the wireless charging receiving device is arranged on the building, and the electric energy generated by the photovoltaic module can be transmitted to the wireless charging receiving device through the wireless charging transmitting device.

The invention discloses a high-voltage cable live-line combustion device and system, and belongs to the technical field of cable combustion tests.The high-voltage cable live-line combustion device comprises a shell internally provided with a containing cavity; the fixing frame is arranged in the shell, and the fixing frame is used for fixing a cable; the electric arc generator is arranged in the shell, the electric arc generator is used for generating an electric arc, and the electric arc is used for igniting the skin of the cable. Combustible gas ignition is replaced by arc generator ignition, so that external interference is reduced; by arranging the voltage source, the current source and the variable resistor, the fault condition of the cable is simulated more truly, the influence of voltage and current in the cable combustion process is reflected, and the control precision is higher.

The present invention relates to the technical field of vibration testing of structural components, and specifically to a performance testing device, testing method and system for a steel frame. The present invention first obtains all vibration signal components of the vibration signal of each measuring point of the bridge steel frame under each external excitation, and all vibration peaks therein; then clusters the vibration peaks in each vibration signal component, obtains the periodic index of the vibration peak in each cluster, and divides each vibration signal component to obtain all component sub-segments, and then obtains the representative coefficient of each vibration signal component, and then screens out the vibration characteristic components of the vibration signal of each external excitation at each measuring point, so as to facilitate the final evaluation of the performance of the bridge steel frame. Based on the characteristic that the vibration signal under external excitation has periodic vibration characteristics, the present invention analyzes and screens out the corresponding vibration characteristic components, reduces the interference of other random vibration factors such as the environment or traffic, and accurately evaluates the performance of the bridge steel frame.

This invention provides a method and apparatus for processing electroencephalogram (EEG) signals based on a non-invasive brain-computer interface, belonging to the field of medical device technology. Specifically, it includes: determining an identification and processing scheme for the EEG signal staging model of the target based on the variation of amplitude data of the electrodes of the target, combined with the risk of variation of the amplitude data of the target's electrodes and the similarity to other targets, as well as signal-stable electrodes; determining the interference risk type and location of the target based on the deviation data of the EEG signal staging results between different identification and processing schemes; and determining the processing method for the EEG signal at the location of the interfering electrode based on the similarity of the identification and processing schemes with identification deviations in each target, and the interference risk type of the target. This improves the accuracy of sleep staging results.

The utility model discloses a laser etching character recognition module which comprises a vertical frame and a support, the front end of the vertical frame is fixedly connected with the support, the top end of the support is fixedly connected with a connecting plate, the bottom end of the connecting plate is fixedly connected with a transverse plate, the front end of the transverse plate is fixedly connected with a vertical plate, and the front end of the transverse plate is fixedly provided with an electric sliding rail. And a moving seat is assembled outside the electric sliding rail. According to the laser etching character recognition module, the electric sliding rail, the moving seat, the recognizer body and the shooting device are arranged, and through the electric sliding rail and the moving seat in the laser etching character recognition module, the recognizer body can automatically adjust the distance between the shooting device and a recognized object according to recognition requirements; the electric sliding rail can automatically adjust the position of the movable seat according to a program instruction or real-time feedback, it is ensured that the shooting device is located at the optimal shooting position all the time, the quality inspection efficiency can be remarkably improved, and the problem that the shooting device needs to be manually adjusted is solved.

The utility model discloses an injection oil cylinder for an injection molding machine, which comprises an oil cylinder and a piston rod, and the piston rod can extend into the oil cylinder and can move along the central axis of the piston rod in the oil cylinder; end covers are arranged at the two axial ends of the oil cylinder, so that a sealed oil cavity is formed in the oil cylinder; any end cover is connected with a displacement sensor, and the displacement sensor comprises a sensor connecting rod capable of extending into the oil cylinder; moreover, a position magnetic block capable of being matched with the sensor connecting rod is arranged at the end, close to the sensor connecting rod, of the piston rod, the position magnetic block and the piston rod move synchronously, and the displacement sensor outputs displacement signals of the piston rod by detecting magnetic field changes caused by movement of the position magnetic block. According to the utility model, the displacement sensor is directly integrated on the end cover of the injection oil cylinder, the structure is compact, the size of the whole device is reduced, and the installation space is saved; the device is compact in structure, high in measurement precision, strong in anti-interference capability and convenient to install and maintain.

The invention relates to the related technical field of vertical shaft excavation supporting, and discloses a vertical shaft excavation supporting construction safety operation platform which is characterized in that supporting frames are installed on the surface of a lifting platform base, a bridge frame is connected between the supporting frames, and an active lifting device is installed on the surface of the bridge frame; the installation protection device is connected to the lower portion of the active lifting device, the operation platform is connected to the lower portion of the installation protection device, the installation protection device comprises a top protection plate, and four sliding cylinder devices are arranged on the surface of the top protection plate in an array mode; according to the construction method, the operation safety can be greatly enhanced, the risks of rockfall, soil block sliding and the like are effectively restrained by isolating the excavation area from the operation platform, and the safety of field personnel and equipment below is ensured. More importantly, temporary stable support is provided for an unstable soil body or a rock stratum in the excavation process, and for vertical shaft excavation under deep or complex geological conditions.

The invention discloses a high-integration-level linear driver which comprises a front end cover, a pull pressure sensor is arranged in the center of the front end cover, a head shell is arranged on the front portion of the pull pressure sensor, a head connecting piece is arranged at the front end of the pull pressure sensor, a front end shell is arranged on the rear side of the front end cover, and a common-speed connecting piece is arranged in the front end shell. A torque sensor, a torque sensor mounting plate, an angular contact ball bearing and an encoder mounting plate are sequentially arranged on the outer wall of the common-speed connecting piece from front to back, a frameless torque motor is arranged in the rear end cover shell, a nut is arranged in the frameless torque motor, a transmission assembly is arranged in the nut, and a lead screw is arranged in the transmission assembly. The rear end cover is arranged on the rear side of the rear end cover shell. The frameless torque motor and the reverse planetary roller lead screw are adopted, so that the system size is remarkably reduced, and the flexibility of spatial layout is improved. The high efficiency and high torque density characteristics of the frameless torque motor are combined with the compact structure of the planetary roller screw, so that the driving mode is more efficient and accurate.

The invention provides a vehicle-mounted yield measuring system for double cells. The double-cell vehicle-mounted yield measurement system comprises a mounting frame, a sliding seat which is movably arranged at the bottom of the mounting frame and can be horizontally pulled and moved, and a yield measurement module which is fixed on the sliding seat and is used for testing seeds, the two grain feeding funnels are respectively fixed at the top of the mounting frame and are used for guiding harvested seeds to enter the yield measuring module; and the two grain discharging funnels are fixed at the bottom of the mounting frame and are used for discharging the measured seeds from the yield measuring module. According to the invention, a continuous yield measurement mode of double grain collection bins is adopted, so that the harvester can harvest in the next area without waiting, the yield measurement time is greatly shortened, and the overall efficiency and data quality of a breeding test are improved.

The application belongs to the technical field of frequency domain measuring devices, and discloses a portable electrochemical impedance detection auxiliary device and a control method, which comprises a shell, the shell has a shielding function, the shell is internally provided with a power supply module, a main control module, a temperature control and electrode chamber module, and an impedance detector connection module, the surface of the shell is provided with a man-machine interaction module and an impedance meter connection terminal, the power supply module is used for supplying power to the whole device, the temperature control and electrode chamber module and the man-machine interaction module are electrically connected with the main control module, the main control module is used for transmitting information with the man-machine interaction module, and the temperature control and electrode chamber module is controlled to perform a constant temperature and variable temperature task at a fixed time. The application optimizes electrode wiring, constant temperature and variable temperature operations into simple electrode loading and unloading and man-machine interaction, and reduces the complexity of operation. The device integrates temperature control, electrode connection, electromagnetic shielding and other functions, and better guarantees the accuracy and stability of impedance measurement signals.

The utility model provides a testing device for an electromagnetic valve and a pneumatic control valve, and belongs to the technical field of valve performance detection. Comprising a bottom plate and a housing, and the housing and the bottom plate are fixedly connected to form a closed structure; a power switch, a power fuse and a counting reset key are arranged at the top of the housing, and a control part extends out of the housing; at least one electromagnetic valve switch is arranged at the upper part of the front of the housing, a pause key, a start key and a time relay are arranged in the middle of the front, and operation interfaces of the keys and the relay are exposed out of the surface of the housing; a power supply and an intermediate relay are fixed at the upper part of a closed space formed by the bottom plate and the housing, a binding post is arranged in the middle, at least one group of electromagnetic valves are mounted at the lower part, and a mouthpiece of each electromagnetic valve extends out of the housing. According to the utility model, through modular design, each solenoid valve can be controlled according to requirements to realize on-off tests and long-time fatigue tests of various pneumatic control valves or solenoid valves, and the problems of low test efficiency and insufficient safety in the prior art are solved.

The present invention relates to the technical field of unmanned aerial vehicle path control, and specifically discloses a path planning method for unmanned aerial vehicle power grid inspection operations based on Beidou navigation. The method comprises: obtaining historical inspection contribution values ​​of various power grid areas, combining actual operation status contribution values ​​of various power grid areas, determining priority values ​​of unmanned aerial vehicle power grid inspection operations of various power grid areas, determining initial paths of unmanned aerial vehicle power grid inspection operations, determining heights of unmanned aerial vehicle power grid inspection operations of various power grid areas, obtaining obstacle position coordinates of connection paths of various power grid areas based on Beidou navigation, determining detour plans for unmanned aerial vehicle power grid inspection operations of connection paths of various power grid areas, and correcting the initial paths of unmanned aerial vehicle power grid inspection operations. The present invention solves the problem that traditional path planning methods can no longer meet the needs of efficient and intelligent inspections, combines the problem of insufficient dynamic optimization capabilities of real-time data, improves the effectiveness of inspections, reduces the flight risks of unmanned aerial vehicles, and ensures the smooth progress of inspection tasks.

The utility model relates to the technical field of positioning terminals, and discloses an anti-interference Beidou high-precision positioning terminal, which comprises a positioning terminal main body, and a telescopic antenna is arranged at the upper end of the positioning terminal main body. When the anti-interference Beidou high-precision positioning terminal is used, noise reduction processing is carried out on an original signal through the digital filtering module, in combination with cooperative work of the Beidou positioning module and the radio frequency signal module, it is ensured that positioning data are accurate and reliable, errors are reduced, meanwhile, through the arrangement of the anti-interference assembly, the electromagnetic wave absorption layer absorbs stray electromagnetic waves in the environment, and the positioning accuracy is improved. The high electromagnetic shielding layer obstructs the interference of an external strong electromagnetic field, the anti-falling elastic buffer layer reduces the influence of physical vibration on an internal circuit, and triple protection ensures that signals are pure, so that signal attenuation and external interference in a complex electromagnetic environment can be effectively weakened, the positioning precision is improved, and the practicability of the anti-interference Beidou high-precision positioning terminal is improved.

The invention discloses a measuring device for the permeability characteristics of slurry in a shield tunnel, which relates to the technical field of tunnel stability excavation, and aims to solve the existing problem that it is impossible to independently and simultaneously monitor the pressure change process and change key parameters such as the seepage coefficient, and its measurement accuracy is greatly affected by human operation and changes in disassembly and assembly time; through this measuring device, real-time monitoring and storage of experimental data on the infiltration characteristics of slurry in the shield tunnel can be achieved, and the permeability coefficient of the change in pore water pressure due to the infiltration of slurry in the shield tunnel can be analyzed based on the monitoring data of multiple sensors at different positions. The measuring device has good sealing performance, can continuously and automatically collect data, and is less affected by external interference. The measuring device can simulate different hydraulic gradient conditions through a reducer structure.

The invention discloses a calibration method and system of a vehicle-mounted clock and an automobile, and belongs to the technical field of automobile electronics, and the method comprises the following steps: carrying out frequency division processing on a main crystal oscillator through a microcontroller (MCU); a pulse width modulation (PWM) signal with a specified frequency is sent out through a microcontroller (MCU); measuring, by a frequency meter, a frequency value F1 of a pulse width modulation (PWM) signal of a specified frequency; recording the oscillation frequency N1 of the main crystal oscillator in a first preset time through a microcontroller (MCU); recording the oscillation times N2 of the sub crystal oscillators in a first preset time through a microcontroller (MCU); calculating a frequency value F2 of the sub crystal oscillator in a first preset time through a microcontroller (MCU); the magnitude relation between the frequency value F2 of the sub crystal oscillator and 32768 is judged through a microcontroller (MCU), and the register is configured according to the judgment result. According to the calibration method and system of the vehicle-mounted clock, high-precision calibration can be periodically carried out on the vehicle-mounted clock.