8results about How to "Reduce acquisition error" patented technology

The invention discloses a lithium ion cell nondestructive lithium precipitation detection method, which specifically comprises the following steps: at a certain temperature, determining the charging open circuit voltage OCV of a normal lithium precipitation-free cell and a lithium ion battery to be detected, and generating an SOC-OCV table; the method comprises the following steps: carrying out charge-discharge circulation on a lithium ion battery at a certain charge rate and temperature to obtain a voltage-temperature rise curve, and roughly determining a voltage interval of stable heat production of a battery cell based on the voltage-temperature rise curve; a charging dQ / dV curve is obtained based on an incremental capacity method, the inflection point is accurately determined in the voltage interval of stable heat production of the battery cell in the dQ / dV curve, and the polarization heat production value corresponding to the interval from the inflection point to the charging end is calculated; and carrying out polarization heat proportion calculation on the batch of battery cells, and screening out the battery cells lower than a threshold value based on an outlier method as lithium precipitation battery cells. According to the method, lithium precipitation detection can be carried out under the condition that a sensor and a reference electrode are not additionally arranged, and risk assessment is carried out on early lithium precipitation of the high-capacity lithium ion battery cell.

The present invention discloses a comprehensive monitoring system for ocean currents based on an ocean observation buoy, which relates to the field of ocean observation technology, and includes a buoy main body module, a net buoyancy adjustment module, a motion state prediction module, a buoy deviation evaluation module, a buoy motion optimization module, and a data transmission module, wherein the modules are connected by electrical signals; the buoy main body module is equipped with various sensors to collect physical parameters of the ocean environment. Through the coordinated work of the motion state prediction module and the buoy motion optimization module, the system can predict and adjust the motion state of the buoy to reduce the data collection error caused by environmental changes, thereby improving the accuracy of the data, providing a solid data foundation for marine scientific research, and through the motion state evaluation module, the abnormal motion state of the buoy can be discovered in time, and the state of the buoy can be quickly adjusted through the motion optimization module to ensure the continuity and accuracy of the data.

This application relates to a UAV frame for bridge inspection, belonging to the technical field of UAVs. It includes a UAV body with a connecting frame at its bottom. This application utilizes a plug-in engagement between a plug and the connecting frame, and a limiting block driven by a push spring in a snap-fit ​​assembly to achieve automatic initial positioning. Simultaneously, a bidirectional lead screw driven by a first servo motor in the limiting assembly drives a moving frame and its locking block for a secure secondary locking. This significantly simplifies the installation and disassembly process of the UAV body and the connecting frame. Furthermore, a buffer assembly located on the outside of the connecting frame, with its support plate sliding within the damping sleeve of the support leg via a slide rod, compresses the buffer spring. This effectively absorbs and dissipates the impact energy generated during UAV takeoff and landing or sudden collisions, maximizing the protection of the precision components inside the UAV body and the shooting and detection devices within the mounting frame. This significantly reduces data acquisition errors and improves operational safety and data reliability.

This invention relates to the field of vision acquisition technology, specifically to an intelligent vision acquisition system based on automatic calling. The system includes a non-slip seat and a vertical backrest. The vertical backrest is fixedly installed on the rear surface of the non-slip seat and perpendicular to its upper surface. A response control box is fixedly installed above the non-slip seat, and a lifting adjustment cylinder is fixedly installed on the rear surface of the vertical backrest. A screw drive structure is located above the lifting adjustment cylinder. This invention enables the subject to complete vision acquisition independently through automatic calling, requiring no staff assistance and significantly reducing manpower requirements. It also offers better acquisition accuracy. The screw drive structure, in conjunction with an electronic display panel, displays vision test symbols of different sizes. The system's proximity adjustment, combined with the screw drive structure, accurately determines the subject's vision status.

The utility model discloses an electrocardiogram monitoring device, which belongs to the technical field of electrocardiogram monitoring and comprises a calibration voltage generating circuit, a plurality of analog switches, a pre-stage amplifying circuit, a post-stage amplifying circuit, a filter circuit and a controller. When the electrocardiogram monitoring device works in a calibration mode, a calibration signal is generated, the calibration signal is electrically connected with the pre-stage amplification circuit, the pre-stage amplification circuit is disconnected from the filter circuit, and an output signal of the post-stage amplification circuit is compared with the calibration signal to obtain an actual amplification factor; when the electrocardio monitoring device works in an electrocardio acquisition mode, the electrocardio input signal is electrically connected with the pre-stage amplification circuit, the pre-stage amplification circuit is electrically connected with the filter circuit, and an actually acquired electrocardio signal is obtained according to an output signal of the post-stage amplification circuit and an actual amplification factor. According to the scheme, the circuit is simple, the cost is low, and the electrocardiosignal acquisition error is effectively reduced.

The application discloses a kind of electric core connecting system and battery, belong to battery technical field, the electric core connecting system, comprising: wiring harness, busbar, voltage acquisition component and temperature acquisition component, wiring harness is suitable for with battery management system electric connection, busbar is suitable for electric connection multiple electric cores, voltage acquisition component is electrically connected with wiring harness and busbar respectively, voltage acquisition component collects the voltage of electric core by busbar, temperature acquisition component includes first circuit board and temperature sensor, in temperature acquisition component, the first heat conduction area of first circuit board can be directly contacted with electric core by its corresponding heat conduction material, the heat of electric core can be transferred to temperature sensor along first heat conduction area, heat conduction hole and second heat conduction area by heat conduction material, can improve the accuracy that temperature sensor acquires electric core temperature, reduce the acquisition error of temperature acquisition component.

The present invention discloses a method for judging the trend of industrial time series data, including collecting industrial data within this time period, and verifying and preprocessing the industrial data to obtain an industrial time series data set; extracting features from the industrial time series data set to obtain feature data of the industrial time series data set; combining the number of interval segments preset by the target user to form multiple data intervals; approximating the industrial time series data, the approximate value is the upper limit or lower limit of the data interval in which it is located, to form an approximate value data set; combining the size relationship of the adjacent data before and after the approximate value data set to obtain a linear state coding data set, and judging the data trend according to the adjacent data in the adjacent linear coding data set. When using this method, the target user only needs to preset the number of interval segments, and the accuracy of trend judgment can be controlled by the number of interval segments, reducing the influence of data noise on the trend judgment result, and increasing the stability of the trend judgment of this method.

The present invention discloses a nano-displacement real-time measurement system based on laser polarization interference, including an infrared laser, a first polarizer, a variable aperture, a first polarization beam splitter prism, a first 1 / 4 wave plate, a movable plane reflector, a second 1 / 4 wave plate, a fixed plane reflector, a third 1 / 4 wave plate, a depolarization beam splitter prism, a second polarizer, a second polarization beam splitter prism, a first photodetector, a second photodetector, a third photodetector, a data acquisition card and a host computer. The present invention also discloses a nano-displacement real-time measurement method based on laser polarization interference. The present invention uses a single-frequency laser to achieve a simple structure and low-cost nano-displacement real-time measurement, overcoming the problems of complex structure and high cost of a traditional dual-frequency laser interferometer. At the same time, the displacement direction is realized by judging the rotation direction of the polarization state, solving the dilemma that the traditional single-frequency laser interferometer cannot distinguish the back and forth vibration of the measured object.