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434results about How to "Strong anti-interference ability" patented technology

Method for detecting arc faults based on time-frequency characteristics of high-frequency current component

The invention discloses a method for detecting arc faults based on the time-frequency characteristics of high-frequency current component. The method comprises the following steps: measuring the transient high-frequency current in a primary loop by using a self-integrating Rogowski coil and performing the spectrum analysis of the high-frequency current; measuring the time difference between the zero-crossing time of a power-frequency current and the time that the signal of the transient high-frequency current appears by adopting a counting method via using an interrupt trigger and a timer/counter, so as to confirm the phase angle position where the high-frequency current occurs in the protected loop load current; and judging whether an arc fault is caused or not according to the spectrum characteristics of the high-frequency current, the phase angle position where the high-frequency current signal occurs and regularity of the signal of the high-frequency current. The invention is capable of detecting arc faults in the normal power supply, is limited by installation position slightly, can distinguish the transient current generated by normally connecting/disconnecting a circuit from the power electronic-load current of the switch power supply and the like, and reduces and avoids misoperation.
Owner:XI AN JIAOTONG UNIV

Rotor position estimation and correction method for permanent magnet synchronous generator

The invention provides a method for estimating and correcting the position of a permanent-magnetic synchronous generator rotor. The method comprises the following steps that: by taking zero crossing points of the pole-tip phase/line voltage of a motor as boundaries, a 360-degree electrical angle of a motor rotor is divided into twelve electrical-angle intervals; by taking the relative relation between the phase/line voltage of three phase and zero as a general judgment method of a current angle interval and taking a special judgment process of the current electrical-angle interval provided as a basis, the current electrical-angle interval is judged; according to the electrical rotational speed of the generator rotor, an electrical-angle increment of the motor rotor is obtained through calculation; the sum of the increments of an angle corresponding to an initial point and the electrical angle relative to the initial point in each electrical-angle interval is a position signal of the motor rotor; by taking the quantity of the position signal as the quantity of a basic position signal, the deviation quantity of the position information of the motor rotor is estimated through specific control algorithm; and by taking the deviation quantity as the feedback quantity of a position-correcting link, the quantity of the basic position signal is compensated with an output result through the regulation of a regulator, so that an accurate position signal of the motor rotor can be obtained.
Owner:NARI TECH CO LTD +1

UWB-based indoor mobile robot navigation and positioning system

The invention discloses a UWB-based indoor mobile robot positioning and navigation system, including a device layer, an intermediate layer and an application layer; the device layer completes the construction of a system hardware platform, including a base station, a label, a mobile robot and a Wifi communication module, Among them, the base station and the tag realize the positioning function, and the Wifi module and the communication base station in the base station are used to connect the device layer and the middle layer to realize the upload and release of information; the middle layer includes a database, data analysis software and a server to complete data storage and forwarding, analysis and processing and remote access control functions; the application layer mainly provides a friendly remote client software interface to realize online update of mobile robot status information, completion of mobile robot path planning and generation of other related reports. The invention uses UWB technology to realize the positioning and navigation of the indoor mobile robot, and has the advantages of strong anti-interference ability and low power consumption. For other positioning technologies, using UWB signals for indoor positioning can obtain higher positioning accuracy and stability.
Owner:NANTONG UNIVERSITY

Detonation velocity photoelectric test method and apparatus of detonating cord

The invention relates to a photoelectric testing method for the detonating speed of a detonating fuse and a device thereof. The device is characterized in that the device at least comprises two multimode fibre probes inserted into the detonating fuse in certain distance, a fibre coupling connector, a PIN integrated photoelectric detector, a power supply, an FPGA high-speed data acquisition module and a liquid crystal display screen; the PIN integrated photoelectric detector is used to carry out time sharing processing on the temporal fore-and-aft relation of optical signals acquired by the probes in time; optical signals of a plurality of probes are converted into pulse electric signals and are transported to the FPGA high-speed data acquisition module; the input pulse electric signals are subjected to sampling, calculation processing, control and caching; the distance of each two probes of the plurality of the probes and the measured time are subjected to calculation processing to seek an average speed; the detonating speed and relevant data of the detonating fuse are transmitted to the liquid crystal display screen and are displayed; and the photoelectric testing method has the advantages of high testing precision, strong antijamming capacity, small volume, simple operation and the like.
Owner:ZHONGBEI UNIV

Geometry target positioning method based on multi-layer depth and color visual information

The invention discloses a geometry target positioning method based on multi-layer depth and color visual information. The method comprises the following steps: correcting internal parameters and distortion coefficients of a color camera and a depth camera, and determining a conversion matrix relationship between the images of the two cameras of the depth camera and the color camera; acquiring color and depth image information of the target object; preprocessing the color image in an HSV color space according to the intuitive image characteristics of the color, and segmenting a binary image ofthe target object; eliminating the background of the depth image through background subtraction, carrying out the multi-level threshold binarization operation, and segmenting an object through the multi-level depth image); carrying out edge contour detection based on the multi-level binary image, and identifying a target geometry through parameter screening; and calculating a central coordinate and a rotation angle of the target geometry through the Hu invariant moment and converting the central coordinate and the rotation angle into a world coordinate system of the visual system. According tothe invention, the identification effect on the texture-free geometry is good, and the anti-interference capability for different light environments is strong; the principle of object recognition issimple, the calculated amount is small, and the requirement for real-time recognition can be met.
Owner:CHANGZHOU INST OF DALIAN UNIV OF TECH

Drilling system

The invention relates to a continuous-pipe intelligent electric drilling system. The drilling system comprises a ground control system, a continuous pipe and a lower drilling tool, wherein the continuous pipe is internally provided with a photoelectric composite cable, the photoelectric composite cable is internally provided with a three-phase power cable, a power cable, a signal cable and an optical cable, the ground control system comprises an injection head, a ground photoelectric converter, a PLC (programmable logic controller) control module, a roller, a rectification inverter, a boosting transformer and a ground information processing module, and the lower drilling tool comprises a connector, a cable head short section, a non-rotating connector, a telemetry short section, a power-driven power-off and circulating short section, a drilling parameters measuring short section, a well deviation measuring short section, an electric motor, an electric guide short section, a near bit measuring short section and a drill bit. For the drilling system, an electricity and information channel between the ground and the underground is established by injecting the photoelectric composite cable in the continuous pipe, thus overcoming the defects of the continuous pipe made of the composite material, and the drilling electrification and intelligentization of the continuous pipe are realized by matching with the existing continuous pipe and the equipment.
Owner:SICHUAN HONGHUA PETROLEUM EQUIP

Transformer winding deformation degree and fault diagnosis method based on frequency response analysis method

The invention provides a transformer winding deformation degree and fault diagnosis method based on the frequency response analysis method. First, the waveform of a power distribution device connected with a high-voltage casing is measured by an oscilloscope, the oscilloscope is connected in parallel between the end of the high-voltage casing and a knife switch to obtain the waveform of external electromagnetic interference signals, and short-circuit grounding is carried at a secondary side and at a third side respectively. The frequency response analysis method is a sensitive method for analyzing the deformation degree of a transformer winding. According to the frequency response analysis method, whether a winding deforms is judged by comparing response curves. The frequency response analysis method has strong anti-jamming capability, so that the test result has good repeatability and is more in line with the requirement of state overhaul. Transformer lead dismantling is needed in current field test. Therefore, the invention provides a test method for testing a transformer winding without dismantling a lead through interference signal filtering, and the efficiency of on-site transformer winding deformation degree detection is improved.
Owner:STATE GRID CORP OF CHINA +1

Interactive lamplight intelligent control system

The invention relates to an interactive lamplight intelligent control system. The system comprises a lamp effect controller, a sensor node controller and sensor nodes corresponding to all lamps, wherein the sensor nodes and the lamps form arrays to be evenly distributed and arranged on a ceiling. The lamp effect controller comprises a microprocessor a, an on-scene communication bus interface module a, an RS485 bus interface module, a memory card module and a touch display module; the sensor node controller comprises a microprocessor module b, an on-scene communication bus interface module b and a power supply conversion module b; each sensor node comprises a human body detection sensor module, a microcontroller module, an on-scene communication bus interface module c and a power supply conversion module c. Due to the fact that each sensor node contains a human body detection sensor, human body locating and movement detection can be effectively completed, and interaction between a person and the lamplight arrays is achieved. According to the interactive lamplight intelligent control system, a large-scale integrated circuit is adopted, and therefore the interactive lamplight intelligent control system has the advantages of being small in size, high in response speed, novel in design, low in power consumption, wide in adapting range and convenient to popularize and use.
Owner:武汉华大石居科技有限公司

Magnetic positioning based online monitoring method of achieving of landslide deep layer displacement measurement

InactiveCN103411527AStrong anti-interference abilityHigh data sampling frequencyUsing electrical meansMagnetic signalMagnetic detector
Disclosed is a magnetic positioning based online monitoring method of achieving of landslide deep layer displacement measurement. One permanent magnet and two or more magnetic detectors constitute a local node monitoring system, and a plurality of nodes are distributed on a landslide body to form an overall landslide monitoring network; in the local node monitoring system, the permanent magnet is fixed to a landslide body stabilizing layer, the magnetic detectors are placed on a landslide layer of the landslide body, after magnetic signals detected by the magnetic detectors are sent back to a monitoring center, the space positions of the magnetic detectors are worked out through a magnetic positioning algorithm, when a landslide happens, the space orientations and space positions of the magnetic detectors will change, the space positions of the magnetic detectors are determined through the same algorithm after the landslide happens, landslide deep layer displacements of the local nodes can be worked out through coordinate transformation, and landslide deep layer displacement data obtained through the monitoring network composed of the local monitoring nodes can be synthesized to assess landslide body deep layer landslide situations.
Owner:CHINA THREE GORGES UNIV

Orthogonal double grating based synchronous phase shifting common-path interference microscopy detection device and detection method

The invention discloses an orthogonal double grating based synchronous phase shifting common-path interference microscopy detection device and a detection method, and belongs to the technical field of optical interfering detection. The invention solves problems of complexity in processing process of detection data and low measurement accuracy in existing synchronous phase shifting interference microscopy detection methods. The method integrates the interfering microscopy technology with the orthogonal double grating common-path synchronous phase shifting technology, linear polarization parallel light after collimation and beam expansion is divided into object light and reference light by a first polarized beam splitter prism and a second polarized beam splitter prism to be ultimately converged at a rectangular window side-by-side, a computer obtains an interference figure containing four patterns by collection, and phase distribution of an object to be detected is obtained by calculating according to strength distribution of the four interference patterns. The orthogonal double grating based synchronous phase shifting common-path interference microscopy detection device and the detection method are suitable for measurement of three-dimensional shape and phase distribution of micro-objects.
Owner:HARBIN ENG UNIV

Automobile acceleration monitor anti-theft warning system

The car acceleration supervision and guard against theft and alarm system includes the sensor of the wheel state within the wheel, the sound-light annunciator within the bodywork. The sensor of the wheel state within the wheel comprises of the acceleration sensor, the first microprocessor which is linked with the fan-out of acceleration sensor and the first module of radio frequency launch which is linked with the input of the first microprocessor. The vehicle guard against theft and alarm system comprises of the second microprocessor, the second module of radio frequency launch which is linked with the input of the second microprocessor, the module of orientation and communication of the vehicle, the holding terminal. The sensor of the wheel state and the system of guard against theft and alarm of vehicle forming the system can check the non-normal movement of the vehicle by wireless dispatcher. The combination of the system of guard against theft and alarm of the vehicle and the module of orientation and communication of the vehicle can form the system that can supervise the non-normal movement of the vehicle. The alarming modes have the wireless warning, vehicle orientation tracing and long-distance control in addition to the traditional sound-light warning, which insure the alarming valid in time.
Owner:朱善伟

Fiber bragg grating temperature sensor based GIS (Geographic Information System) equipment contact terminal temperature monitoring system

The invention relates to a fiber bragg grating temperature sensor based GIS (Geographic Information System) equipment contact terminal temperature online monitoring system. The fiber bragg grating temperature sensor based GIS equipment contact terminal temperature monitoring system comprises a fiber bragg grating temperature sensor, a fiber bragg grating interrogator and a computer. The high accuracy fiber bragg grating temperature sensor respectively measures the GIS outer casing temperature, the contact terminal temperature and the environmental temperature; the interrogator receives and demodulates wave length signals reflected by the temperature sensor; the computer which is used for displaying temperature signals obtained by the interrogator can monitor the temperature change in real time. The fiber bragg grating temperature sensor based GIS equipment contact terminal temperature monitoring system has the advantages of being high in accuracy due to the facts that an appropriate algorithm is adopted and the contact terminal temperature is indirectly obtained through the outer casing temperature and the environmental temperature; enabling the GIS equipment to be reliably operated due to the fact that the fiber bragg grating temperature sensing technology is applied to the GIS equipment contact terminal temperature online monitoring; being strong in disturbance resisting capability and good in insulating performance, allowing fixed-point measurement, achieving real-time online measurement of the temperature and having wide application prospects.
Owner:STATE GRID CORP OF CHINA +2
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