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7260results about How to "The principle is simple" patented technology

Instantaneous impact point based unmanned aerial vehicle non-collaborative real-time obstacle avoidance method

The invention discloses an instantaneous impact point based unmanned aerial vehicle non-collaborative real-time obstacle avoidance method. The instantaneous impact point based unmanned aerial vehicle non-collaborative real-time obstacle avoidance method comprises the steps of 1 performing obstacle detection, namely obtaining a relative motion state of an obstacle, 2 performing obstacle motion estimation, namely obtaining machine state information based on satellite navigation information and calculating a motion state of an inertial space obstacle, 3 performing impact conflict detection, namely judging whether obstacle impact occurs or not, 4 performing obstacle avoidance decision making, namely making an obstacle avoidance decision based on a detection result in the step 3, 5 performing obstacle avoidance route re-planning based on a quick expanding random tree algorithm considering an instantaneous impact point, namely introducing route evaluation heuristic information based on the instantaneous impact point and achieving obstacle avoidance route re-planning. The instantaneous impact point based unmanned aerial vehicle non-collaborative real-time obstacle avoidance method has the advantages of being simple in principle, easy to achieve, capable of improving unmanned aerial vehicle safety and the like.
Owner:NAT UNIV OF DEFENSE TECH

Electric pressure cooker with cover closing detector

The invention discloses an electric pressure cooker with a cover closing detector. The electric pressure cooker comprises a pressure cooker body and a pressure cooker cover; the pressure cooker coveris arranged in the top of the pressure cooker body, handle rods are arranged symmetrically in the left and right sides of the pressure cooker body and fixedly connected to the pressure cooker body, the front side of the pressure cooker body is provided with a control panel, an indicating lamp is arranged in the left upper portion of the control panel, and a warning loudspeaker is arranged in a right upper portion of the control panel; and the top of the pressure cooker cover is provided with a fixed protruded column, the fixed protruded column is fixedly connected with the pressure cooker cover, the bottom edge of the pressure cooker cover is provided with touch protruded columns, and cover closing detection assemblies are arranged below the touch protruded columns respectively. The coverclosing detection assemblies are additionally arranged in the pressure cooker body, and the pressure cooker cover is provided with the corresponding touch protruded columns, and in the contact processof the cover closing detection assemblies and the touch protruded columns, whether the cooker is closed is warned and detected; and the electric pressure cooker is simple in the whole structure and strong in functions.
Owner:黄文才

Standard pose calibration method for six-degree-of-freedom parallel robot used for Stewart platform structure

The invention discloses a standard pose calibration method for a six-degree-of-freedom parallel robot used for a Stewart platform structure. The method comprises the following steps: establishing a base coordinate system {O} and a motion platform coordinate system {P}; under the condition of six-degree-of-freedom parallel robot open chain organization, calibrating position coordinate vectors of Hooke hinge centers and spherical hinge centers of the parallel robot in the{O} and the {P} respectively; selecting three mark points on a motion platform and measuring local coordinates of the mark points in the motion platform coordinate system; installing an optocoupler limit switch at the push rod extending end of an electric cylinder of each supporting leg, and assembling the parallel robot to form a closed chain organization; controlling each supporting leg of the six-degree-of-freedom parallel robot to shorten slowly at a constant speed until each optocoupler limit switch is triggered and stimulates the six legs to stop moving successively, and thus the standard pose of the motion platform is generated; measuring the three mark points on the motion platform, ad calculating the standard pose of the parallel robot; and calculating the initial length of the supporting leg corresponding to the standard pose according to the standard pose. With the method, repeated positioning accuracy is high and reliability is high.
Owner:XIDIAN UNIV

Scanning method for manufacturing three-dimensional object layer by layer

A scanning method for manufacturing a three-dimensional object layer by layer comprises the following steps: (1), dividing each section layer of a three-dimensional object to be manufactured into a thin-wall area and a non-thin-wall area: setting a threshold of the gap width of the section profile of the three-dimensional object, and according to the gap width of the section profile in x/y direction, dividing a coating area required to be scanned into a thin-wall area and a non-thin-wall area, wherein the thin-wall area is an area of which the gap width of the section profile is smaller than the threshold and the non-thin-wall area is an area of which the gap width of the section profile is greater than or equal to the threshold; (2), according to the thin-wall area and the non-thin-wall area, scanning area by area, wherein the non-thin-wall area is scanned, relatively high photon beam or particle beam power and relatively large light spot diameter are selected, and when the thin-wall area is scanned, relatively low photon beam or particle beam power and relatively large light spot diameter are selected. By the scanning method, constraints of efficiency and precision in the process of manufacturing the three-dimensional object layer by layer are balanced to the maximum extent, so that the efficiency is ensured and the accuracy and the surface quality of a machined part are ensured.
Owner:HUNAN FARSOON HIGH TECH CO LTD

Fiber grating distributed strain sensor and strain monitoring method thereof

ActiveCN102052930AHigh measurement accuracyAchieving high spatial resolution localizationCladded optical fibreCoupling light guidesPhysicsTunable laser
The invention relates to a fiber grating distributed strain sensor and a strain monitoring method thereof, which are characterized in that an erbium-doped fiber amplifier is added into an optical fiber fading cavity to form an active fading cavity, and an optical pulse fading sequence is obtained, so the positioning accuracy of submillimeter-magnitude spatial length measurement can be realized; and a wavelength of a tunable laser is in one-to-one correspondence with positioning data of fiber grating bragg reflection space by taking a linear chirped fiber grating or a uniform fiber grating as a sensing device, and the corresponding local strain capacity is demodulated by positioning the variable quantity of a local bragg reflection wavelength to realize distributed strain sensing. In the fiber grating distributed strain sensor, the spatial resolution ratio is improved to a submillimeter magnitude by a direct time domain measurement method, and the fiber grating distributed strain sensor has a compact structure and simple algorithm, can perform on-line monitor in real time and can be used for networking, so that the fiber grating distributed strain sensor has the large application space in the field of optical fiber sensing.
Owner:杭州光学精密机械研究所

Pipelined analog-to-digital converter (ADC) capable of carrying out background digital calibration

The invention discloses a pipelined analog-digital converter (ADC) capable of carrying out background digital calibration. The pipelined (ADC) comprises a sampling hold circuit, M calibrated level circuit modules, N level circuit modules and a back level analog-to-digital conversion module which are sequentially connected in series, wherein each calibrated level circuit module is connected with a corresponding digital calibrated level circuit; the quantized value output port of the level circuit module and the quantized value output port of a back level analog-to-digital conversion module are respectively connected with a time delay and dislocation summation module; and the output end of the time delay and dislocation summation module is sequentially and reversely connected in series in the digital calibrated level circuit. The pipelined analog-to-digital converter provided by the invention has the advantages that the thinking is inventive, the analog circuit has a simple structure, a pseudo random number generator and a multi-way selection switch are additionally arranged on the foundation of the existing technical structure, and the working of other analog circuits can not be unaffected in the working process; and simultaneously, the principle of the digital circuit segment is simple and is easy to realize, the error of the pipelined ADC can be reduced obviously, the linearity of the pipelined ADC can be improved, and the dynamic properties of the pipelined ADC can be improved.
Owner:东南大学无锡分校

Power distribution network fault circuit selection method based on transient zero-sequence current time-frequency characteristic vectors

The invention relates to a power distribution network fault circuit selection method based on transient zero-sequence current time-frequency characteristic vectors, and belongs to the technical field of power system relay protection. When a power distribution network runs into a single-phase earth fault via an arc suppression coil grounding system, a transient zero-sequence current component detected by a measuring end is a nonlinear non-stationary signal formed by different frequency components. By taking the fault component as a study object, time-frequency characteristics of a fault transient current of the fault component are analyzed by utilizing the wavelet packet theory, time-frequency distribution regularities among all feeder lines under different fault conditions are described according to similarity of the time-frequency characteristics, and consequently line selection criteria based on transient zero-sequence current time-frequency characteristics can be obtained. The method is simple in principle, only utilizes short-time window zero-sequence current data of 5ms after the fault, can identify faulty feeders under the conditions of small fault angle and high resistance ground fault, has excellent timeliness and robustness, is free from influence of an arc fault or a resistance ground fault, requires a low sampling rate for hardware, and is highly practical.
Owner:KUNMING UNIV OF SCI & TECH

Precise seeds sowing device for growing seedlings of aperture disk

The invention discloses a precise seeds sowing device for growing seedlings of an aperture disk, which comprises a seeds box, an outlet aperture adjuster, a curtain flow stabilizing plate, a seeds sowing bracket, a pneumatic distribution system and a pneumatic adjustment system; and the outlet aperture adjuster is used for adjusting the size of an outlet of the seeds box, and the seeds are distributed by means of single seed, are orderly arranged and are basically even in density under the action of the curtain flow stabilizing plate after the seeds are flowed out. The pneumatic adjustment system comprises an air compressor and an air pressure adjusting loop connected with the air compressor, wherein a pneumatic distribution central shaft and a rotary drum are divided into a negative pressure cavity and a positive pressure cavity by a seal clapboard: the positive pressure cavity is directly communicated with the atmosphere, the seeds are discharged by means of pressure release when the rotary drum is rotated to the positive pressure cavity, and the seeds are absorbed when the rotary drum is rotated to the negative pressure cavity, therefore, the seeds charge and the seeds absorption are alternately preformed under the continuous rotation of the rotary drum. The device is reasonable in structure, and is novel and simple in principle, so that the precise seeds-sowing is directly realized under the self gravity of the seeds and the free movement of the seeds, and the requirement for applying an outer force such as the vibration and the like in the other various seedlings-growing modes is overcome.
Owner:HUAIHAI INST OF TECH

Method for detecting and positioning section faults of a power distribution network containing distributed generators

The invention relates to a method for detecting and positioning section faults of a power distribution network containing distributed generators, which comprises a fault judging and positioning part and a fault type recognition part. A fault judging and positioning method comprises the steps of detecting a fault and recognizing a fault phase through comparing the relation between an absolute value of the phase angle difference of each phase current of each power system section and a threshold value, finding out a section where a fault point is located, and timely removing the fault section so as to complete a protection action. A fault type recognizing method comprises the steps of comparing zero-sequence current amplitude values at two end nodes of the fault section at the fault determination moment with a set threshold value on the basis of recognizing the fault phase, and judging whether the zero-sequence current amplitudes at the two end nodes of the fault section at the fault determination moment are less than or equal to the threshold value or not, thereby determining whether the fault is a phase-to-phase fault or a grounding fault. The method provided by the invention can be applied to detecting and positioning the section faults of the power distribution network containing the distributed generators under high permeability.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI

Robust lens distortion correction method

The invention discloses a robust lens distortion correction method. The invention provides a method for separating lens distortion from camera parameters to be solved separately. The method comprisesthe following steps of: performing a feature extraction from a checkerboard calibration object by firstly performing angular point detection utilizing a Shi-Tomasi operator, then performing screeningaccording to the specific characteristics of symmetry and large variance of the checkerboard angular point, and finally obtaining an sub-pixel coordinate with accurate checkerboard angular point by utilizing a sub-pixel optimization algorithm; establishing a camera imaging model and a lens distortion model to obtain an optimized objective function with respect to a distortion parameter; and solving the distortion parameter by utilizing a nonlinear optimization algorithm for distortion correction. According to the robust lens distortion correction method, a calculation of all main distortion parameters can be accomplished with only one calibration object image containing the checkerboard, the model is simple, the calculation efficiency and stability are high, the application adaptability isgood in an industrial field, and the calculation accuracy is comparable to a traditional method.
Owner:NANJING HUICHUAN IND VISUAL TECH DEV +1

Tool setting device and method of mini-type numerical control milling machine

The invention provides a tool setting device and method of a mini-type numerical control milling machine, belongs to the field of a machine tool automatic control technology and aims to solve the problems in the prior art that the tool setting precision and the tool setting efficiency are low. The tool setting device comprises CCD (Charged Coupled Device) cameras, light sources and a laser tool setting instrument, wherein the two CCD cameras are orthogonally placed; the two light sources are respectively sleeved at the front ends of the two CCD cameras to illuminate a workpiece; after light is reflected, the light is received by the CCD cameras and is transmitted to an outer computer, so as to determine the positions of the workpiece and a tool in a machine tool coordinate system; the laser tool setting instrument and the workpiece are placed in parallel; a tool nose contacts laser emitted by the laser tool setting instrument and a signal generated by the laser tool setting instrument is transmitted to the outer computer, so as to further determine the position of the tool in the machine tool coordinate system; and data processing is carried out through computer program software so as to realize rapid tool setting. According to the tool setting device and method of the mini-type numerical control milling machine, the tool nose and the workpiece to be machined do not need to be actually contacted to carry out trial cutting, so that an error caused by contacting the tool nose with the workpiece to be machined is avoided, and the tool setting precision and the tool setting efficiency of the workpiece are improved.
Owner:CHANGCHUN UNIV OF SCI & TECH

Permanent magnetic and alternating current direct current composite magnetic flux leakage detecting method

A permanent magnetic and alternating current direct current composite magnetic flux leakage detecting method relates to a magnetic flux leakage detecting method of a pipeline. A magnetizer is composed of a U-shaped magnetic core and a permanent magnet, and an exciting coil is wound around the U-shaped magnetic core. By giving different excitation to the exciting coil, the exciting coil and the permanent magnetic generate composite direct current magnetic field and alternating magnetization field in time-sharing mode. During measurement, the direct current magnetic field magnetizes a ferromagnet to be detected to a deep saturation state, a detected leakage magnetic field signal B1 is compared with a set threshold lambda 1, and whether defects exist in the ferromagnet to be detected is judged; if the defects exist, the alternating magnetization field magnetizes a component to be detected, and an alternating current frequency component B2 of leakage magnetic field strength is compared with a set threshold lambda 2 so as to judge if the defects exist on the inner surface or the outer surface. The method effectively overcomes the defects in the prior art that the defects of the inner surface and the outer surface can not be identified efficiently and accurately and has the advantages of being simple in principle, convenient to operate, free of coupling agent, non-contact in measurement and the like.
Owner:XIAMEN UNIV

Novel adsorption and desorption experiment device and novel adsorption and desorption experiment method

The invention provides a novel adsorption and desorption experiment device and a novel adsorption and desorption experiment method. The device mainly consists of a reference cylinder, a sample cylinder, a confining pressure pump, a booster pump, an air compressor, an intermediate container, a constant temperature system, a pressure sensor and a computer, wherein the sample cylinder mainly consists of a sample chamber, a confining pressure chamber, a left adjustable plug, a right adjustable plug, a barrel, a sealing ring, a screen mesh and a leather sheath; the confining pressure chamber is defined by the barrel and the leather sheath; the sample chamber is defined by the leather sheath and the adjustable plugs; the sample chamber is connected with the reference cylinder; the reference cylinder, the sample cylinder and the pressure sensor are arranged in the constant temperature system; the confining pressure chamber is connected with the confining pressure pump, and the confining pressure pump is used for increasing the confining pressure of the confining pressure chamber, so that the real stratum conditions can be simulated; the sample cylinder is provided with the two adjustable plugs, one adjustable plug is provided with the screen mesh on the top, and the other adjustable plug is not provided with the screen mesh, so that two rock samples including standard rock samples (having length of 5cm and diameter of 2.5cm) or rock sample powder (with 60-80 meshes) can be arranged in the sample cylinder. The device and the method have the advantages that the principle is reliable, and the device is simple in structure and simple and safe to operate; the real stratum environment can be simulated, and temperature and pressure conditions of different reservoir stratums as well as the methane adsorption and desorption law of the rock samples can be determined, so that reasonable experimental data can be provided for shale gas occurrence form research and reserve calculation.
Owner:SOUTHWEST PETROLEUM UNIV

A mixed encryption method in session system

A mixed encryption scheme for a conference system is provided. The encrypting algorithm is that: before data communication, a message clear text is encrypted by using a DES method, and then the DES key is encrypted adopting an RSA method, so as to realize digital signature. By comprehensively using the existing encrypting algorithms DES and RSA, the strong points of which are utilized and the weak points are avoided. As the processing for main data adopts the DES encrypting algorithm, grouping processing for each datum can be completed in a very short time thanks to the fast speed of the DES encrypting algorithm; besides, the DES key encrypted by adopting the RSA algorithm can be publicized; therefore, the overall security system only requires few RSA decryption key. The mixed encryption scheme provided by the invention can not only give full play to the advantage of fast encrypting speed of the DES encrypting algorithm, but also give full play to the advantage of convenient management of the RSA algorithm; therefore, the mixed encryption scheme provided by the invention has the advantages of simple theory, fast speed and being easy to be realized; when being used in an instant communication system, the mixed encryption scheme can meet the requirement for real time and security of a conference system.
Owner:BEIHANG UNIV

Measurement method for lead/ground wire icing thickness of transmission line based on video variation analysis

The invention discloses a measurement method for lead / groundwire icing thickness of a transmission line based on video variation analysis. The method comprises the following steps: shooting an on-site image through a video monitoring device, automatically obtaining the boundaries of the transmission line before and after icing by using image processing technologies including camera calibration, image graying, image enhancement, image segmentation and the like, and further quantificationally calculating the lead / ground wire icing thickness; and when the lead / ground wire icing thickness exceedsa specified safety range, automatically alarming to remind related departments to take deicing measures timely. Since a lead / ground wire icing image is directly used to solve the lead / ground wire icing thickness, the method disclosed by the invention has the advantages of simple principle, higher accuracy and higher reliability, is convenient for operation, and can make up disadvantages of the traditional method,. Therefore a new means is provided for safety detection of transmission lines, a great amount of manpower resource cost can be reduced, the use efficiency of the on-line monitoring system is improved, and the measurement method has great practical significance for ensuring the safe operation of an electric power system.
Owner:西安金源电气股份有限公司
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