93results about How to "Avoid accidental errors" patented technology

The invention provides a test device and method for simulating natural gas leakage in soil. The test device comprises a compressed gas steel cylinder, a pressure reducing valve, a gas flow meter, a PC computer, a pressure-tolerant hose, a rigid pipe, a gas buffer cylinder, a combustible gas probe, a multichannel combustible gas probe controller, a waterproof shield cable, a rigid hose and the like. The gas buffer cylinder and the combustible gas probe are embedded in outdoor soil. Through the rigid hose, zero calibration can be carried out on the combustible gas probe buried in the ground. The test method comprises the steps that the pressure reducing valve of the compressed gas steel cylinder of natural gas is opened; the gas buffer cylinder is filled with the natural gas successively through the gas flow meter, the pressure-tolerant hose and the rigid pipe; the combustible gas probe buried in the ground is used to collect the concentration of the gas leaking out from the gas buffer cylinder; the diffusion law of the natural gas in soil after natural gas pipe leakage is researched; and a technical support is provided for the prevention and the disposition of a natural gas pipe leakage accident.

The invention discloses a five-freedom-degree precise position fixing device for adjustment of lens sets, relating to a position fixing device for adjustment of lens sets, which solves the problem that the traditional optical adjustment method is more in accidental error and poor in consistency of an optical shaft of an adjusted optical product. The position fixing device comprises a supporting base, horizontal screw motors, horizontal position sensors, locating and fixing rings and positioning adjustment bolts; the first horizontal position sensor is arranged on the first horizontal screw motor; the first horizontal screw motor is connected with an X shaft at the bottom of the supporting base; the second horizontal position sensor is arranged on the second horizontal screw motor; the second horizontal screw motor is connected with a Z shaft at the bottom of the supporting base; the first locating and fixing ring and the second locating and fixing ring are fixed at two ends of the supporting base along the Z shaft; the front end of the positioning adjustment bolt is provided with a spring, the rear end of the positioning adjustment bolt is provided with a fixing bolt, the bolt is spun on the locating and fixing ring along a radial direction, and the front end of the bolt penetrates through the fixing ring. The five-freedom-degree precise position fixing device for adjustment of the lens sets is used for the precise positioning in adjustment of the lens sets.

The invention provides a powered parafoil system's air-drop wind field identification method which can dynamically identify the wind speed and wind direction of a wind field that a powered parafoil system flies across so as to provide necessary information for reference to control the trajectory of the parafoil system and the operations for flared landing. The identification process for a wind field is divided into three steps. Firstly, through a GPS module, the positions concerned information of the powered parfoil system can be obtained. Based on the change in the positions of the powered parafoil system, the flying speed and the direction of the powered parafoil system can be calculated. Secondly, the Kalman filtering algorithm is adopted to have the flying speed of the powered parafoil system undergo a filtering process so as to get accurate speed concerned information. Thirdly, the recursive least square algorithm is introduced to online update the identification results of the wind field.

The invention discloses an intelligent balloon. The intelligent balloon comprises a balloon body, a balloon valve, a ballast device, a collecting device and a controller, wherein the balloon valve is arranged on the balloon body and used for deflating the intelligent balloon when being opened; the ballast device is used for releasing ballast; the collecting device is used for collecting environment parameters and flight state information of the intelligent balloon; and the controller is respectively connected with the balloon valve, the ballast device and the collecting device to determine the flight mode of the intelligent balloon according to the flight state information of the intelligent balloon and control the balloon valve and the ballast device according to the flight mode, the environment parameters and the flight state information. According to the invention, the lifting of the balloon can be intelligently controlled and the service life of the balloon can be greatly prolonged so that the balloon can obtain much meteorological data through single flying; the same elevation can be measured for a plurality of times so that the reliability of the measured data is improved; and moreover, the balloon can be controlled to safety and stably land to achieve the purpose of being recycled so that the flight cost is reduced.

The invention relates to a method for measuring nonlinear parameters of an ultrasonic contrast agent. According to the principle of the method, the ultrasonic contrast agent is added in an aqueous medium for micro bubbles, and the micro bubbles change the physical properties of the aqueous medium to cause a significant change in the measured sound pressure amplitude, so that the nonlinear parameters are changed, and the changing situation of the nonlinear parameters is estimated by measuring the change of the sound pressure amplitude. The measuring method is suitable for measuring the nonlinear parameters of a plurality of ultrasonic contrast agents, measurement is convenient, repeatability is strong, and data is easy to obtain and process, second-order nonlinear parameters can be measured, and third-order and high-order nonlinear parameters can also be measured.

The invention relates to a vegetation canopy coverage calculation method and system based on a colorful digital image. The method comprises that the colorful digital image of an area to be calculated is shot vertically; the green characteristic index of each pixel of the colorful digital image is calculated; a Sobel operation is called to calculate a gradient value of each pixel according to the green characteristic index of the pixel, and the green characteristic index of the pixel corresponding to the maximal gradient value serves as a threshold; and the green characteristic index of each pixel is compared with the threshold, the pixels whose green characteristic index is greater than or equivalent to the threshold are attributed to vegetation pixels, the pixels whose green characteristic index lower than the threshold are attributed to non-vegetation pixels, and the vegetation canopy coverage of the area to be calculated is calculated according to the vegetation pixels and the non-vegetation pixels. According to the invention, the vegetation canopy coverage is calculated in high precision, labor force is saved, and the self-adaptability is high.

The invention discloses an attention focus measuring method, and the method comprises the steps: carrying out the real-time measurement of the offset data of the head part of a tested object, and estimating the position of the attention focus of the tested object according to the measurement data; removing a part of group attention focus measurement errors caused by the distraction of the attention of the tested object through abnormality discrimination and clustering. The method provided by the invention is used in a classroom environment for monitoring the class conditions, can provide reliable and visual data for knowing the learning states of students in the classroom, and is higher in value of monitoring the learning conditions of the students in the current classroom teaching.

The invention discloses a prism for a total station. The prism for the total station comprises an upper prism component, a middle connecting component and a lower embedded component, wherein the upperprism component comprises a prism and a prism support, the prism is rotationally connected with the top of the prism support, a prism support level gauge is mounted on the prism support, and a firstfixed upright post is arranged at the bottom of the prism support; the middle connecting component comprises a second fixed upright post, the bottom of the first fixed upright post is connected with the top of the second fixed upright post by virtue of one universal connecting piece, and a screw is arranged at the bottom of the second fixed upright post; and the lower embedded component comprisesa sleeve nut which is used for being matched and connected with the screw, a steel plate sheathes the top of the sleeve nut, and embedded reinforcement is arranged at the bottom of the sleeve nut. Theprism for the total station is simple in structure and reasonable in design, not only is measurement efficiency high, but also an accidental error caused by manual centering can be effectively avoided, and the measurement accuracy of foundation pit monitoring is improved.

The invention relates to a bearing bush two-sided chamfering machine with an automatic feeding and discharging function, and a use method thereof. According to the invention, a pushing device, a blanking groove, a material feeding conveying device, a stirring platform, a retaining cylinder block and an allocation cylinder are arranged on an original machine tool, so that bearing bush blank can be fallen onto the bottom of the blanking groove in pairs and can be pushed into a station moulding bed by the pushing device; the bearing bush blank rotates along with the station moulding bed and is pushed out by the pushing device after being processed by a compressing device and a two-end-face processing device, so that an automatic circulating continuous processing production line is formed. The bearing bush two-sided chamfering machine with the automatic feeding and discharging function is simple in structure, high in automation degree, high in processing efficiency, high in machining precision and low in labor strength; meanwhile, the chamfering machine is simple in use method and operation, and the whole machining process is highly harmonious and unified and is high in security.

The invention discloses a method for determining W parameter of surface runoff pollutant in SWMM software. The method consists of two parts. One is to simulate the erosion of surface sediment with pure water by artificial rainfall under laboratory conditions to form pollutant concentration of surface runoff W0. The other is to consider the natural rainfall water concentration W1 affected by air pollution. By combining the two parts, the determination method of pollutant parameter W of surface runoff under natural rainfall condition is realized. The method solves the problem of determining water quality parameters in SWMM software through the actual runoff data, and combines air pollutants and surface sediment pollutants into urban surface runoff pollution sources to establish a new model of water quality erosion model. Through the method, new SWMM water quality model parameters can be set up in different regions to prevent the errors to the model caused by regional problems.

The invention discloses a rapid nondestructive distinguishing method of Chinese walnuts with different fresh degrees based on an electronic nose. The rapid nondestructive distinguishing method comprises the following steps: directly carrying out body detection on top air of Chinese walnut samples with the known fresh degrees by utilizing the electronic nose; extracting characteristic values by adopting a plurality of types of characteristic extracting methods; selecting the characteristic value with the best fresh degree distinguishing effect in online judgment and analysis as a final characteristic value; constructing a fresh degree distinguishing model composed of at least three sub-models; calculating introduced characteristic values of unknown samples by each sub-model in the fresh degree distinguishing model, and outputting the fresh degrees of the unknown samples; and by counting up the quantity of the fresh degrees output by each distinguishing sub-model in the fresh degree distinguishing model, and obtaining the fresh degrees, namely the fresh degrees of the unknown samples, when the unknown samples are judged to be the samples with the most number of times of the fresh degrees. With the adoption of the method, an accidental error phenomenon, which possibly occurs, of the fresh degree distinguishing model established based on a single distinguishing algorithm is avoided; and the distinguishing accuracy is high so that the rapid nondestructive distinguishing method is worthy of being widely popularized.

The present invention discloses a down-hole personnel location system and method based on wireless pulse flight time measurement. The system comprises an industrial host, an ad-hoc network station anda locater. The method comprises the steps of: 1, laying of a down-hole personnel location system; 2, establishing of a rectangular plane coordinate system; 3, location of down-hole personnel, wherein301, wireless main and slave stations send time request frames to the locater, 302, the locater generates time response frames and returns the time response frames to the wireless main and slave stations; 303, the wireless main and slave stations receive the time synchronization response frames sent by the locater; 304, the wireless main and slave stations send time request frames to the locateragain, 305, the locater regenerates the time response frames and returns the time response frames to the wireless main and slave stations, 306, the wireless main and slave stations receive the time synchronization response frames returned by the locater again, 307, wireless pulse flight time calculation is performed, 308, location distance calculation is performed, and 309, location coordinates ofthe down-hole personnel are determined. The down-hole personnel location system and method can determine the location of the down-hole personnel to monitor the working state of the down-hole personnel.

The invention provides a method for performing horizontal measurement on a product airfoil structure by using a three-dimensional laser scanning system, and belongs to the technical field of measurement. Compared with a platform height gauge method, the three-dimensional laser scanning system is utilized in the method provided by the invention, so that the precision is higher, the measurement advantages of airfoil installation angles and anhedrals with small sizes and high installation precision requirements are obvious, the introduction of accidental errors can be effectively avoided in calculation and measurement processes, and the result is reliable; the entire measurement process neither has requirements for the attitude of the product, nor requires the auxiliary positioning of a tool,thereby reducing the design and manufacture costs and the management of the tool; and the process of repeatedly leveling the product in the horizontal measurement of the airfoil is omitted in the process, a measurement result can be automatically calculated via the data output, thereby effectively reducing the work intensity of operators and improving the operation efficiency.

The invention relates to a compressive strength test machine for a paper box. The test machine includes a bottom board. A PLC is installed on the bottom board. A strength detection apparatus is installed in the middle of the upper end surface of the bottom board through a bolt and can perform high-precision detection on strength of the paper box. Two conveying apparatuses are symmetrically installed at two sides of the upper end surface of the bottom board and are used for automatically conveying to-be-tested paper boxes. Two linking branch chains are respectively between the strength detection apparatus and the two conveying apparatuses and ensure that the paper boxes, conveyed from the conveying apparatuses, can enter the strength detection apparatus successfully for test. The test machine achieves uniform and high-precision detection function of the paper boxes and avoids occasional error during a mono-point test on the strength of the paper box. The test machine is simple in operations, has high test precision, and is high in work efficiency.

The invention belongs to a fluid closed loop type integrated on-line liquid density transmitter which is applicable in density measurement of flowing liquid and static liquid in pipes and cans. The invention includes a precise difference sensor and a professional sampling and closed loop control computer integrated circuit board and a specially matching temperature compensation controller; the differential pressure sensor measures the pressure of different pressure pipes, converts modulus and calculates the closed loop control and displays the density and the medium temperature to the gauge head of an instrument with a double four-digit display screen, and has remote monitoring and maintenance according to a HART agreement.

The invention discloses an automatic monitoring system for high-precision soil frost heaving process, comprising a sample body, a temperature control mechanism, a water supply mechanism, a measuring mechanism, a data collecting mechanism and a seismic isolation bearing, wherein the sample body comprises an organic glass cylinder and a soil sample, the soil sample is placed inside the organic glasscylinder, and the seismic isolation bearing is connected to the bottom of the organic glass cylinder; the temperature control mechanism comprises an incubator, the organic glass cylinder is placed inthe incubator, and a temperature control top plate and a temperature control bottom plate are respectively set on upper and lower sides of the soil sample; the water supply mechanism comprises a water pump, the water outlet of the water pump is connected with a water filling pipe, and the water filling pipe extends through the temperature control bottom plate to the inside of the organic glass cylinder; the measuring mechanism comprises a temperature sensor spirally connected to the side wall of the organic glass cylinder, and a displacement meter disposed above the soil sample, and the temperature sensor and the displacement meter are connected to the data acquisition mechanism. The invention eliminates the influence of mechanical vibration and human reading error on the monitoring result, and deeply reveals the frost heaving mechanism of the soil, and the monitoring result is accurate and reliable.

An intelligent slurry pipe abrasion monitoring system for a slurry balance shield can monitor the state of a slurry pipe in a shield construction process, and therefore abrasion of a pipe wall can bereduced. A pH monitoring device, a pH value blending device, a flow velocity control device, a flow monitoring device and a wall thickness monitoring device are all in signal connection with a data acquisition and processing system; the following actions are executed: when slurry enters the slurry pipe, the pH value of the slurry is measured by the pH monitoring device; if the data acquisition andprocessing system judges that the pH value is not in a reasonable range, the pH neutralizing device is instructed to perform blending; the flow monitoring device is arranged on the downstream side ofthe flow velocity control device and monitors the flow of the slurry pipe and reversely deduces the flow velocity of slurry in the slurry pipe; the data acquisition and processing system judges the change of the flow velocity and instructs the flow velocity control device to adjust the flow velocity of the slurry. The wall thickness monitoring device is used for monitoring the wall thickness of the slurry pipe at a measuring point in real time, and monitored data is transmitted to the data acquisition and processing system, so that risk assessment can be conducted.

The invention discloses a reflux type oil sand oil content and moisture synchronous determination system and a determination method thereof. The device comprises a heating device, an extraction device, a reflux device and a condensation device. The extraction bottle of the extraction device comprises a bottleneck, a first bottle body, a second bottle body and a liquid channel, the second bottle body is placed inside the first bottle body, the bottleneck top of the second bottle body is just located at the bottom of the first bottle body's bottleneck, a U-shaped channel is formed between the first bottle body and the second bottle body, the second bottle body is anon-glued filter cylinder, the bottom of the first bottle body is provided with the liquid channel, a columnar adapter tube is sleeved outside the liquid channel, a gas distribution plate is also disposed between the adapter tube and the liquid channel, and the bottom of the adapter tube is connected to the heating device. The method provided by the invention can respectively determine the oil content, moisture content and solid residue content of an oil sand sample, and avoids the error brought about by direct weighing of solid residue and water mass and then acquisition of the oil content through subtraction method.

The invention relates to a method for determining epoxy chloropropane in water, and belongs to the technical field of chemical analysis. A salting-out and liquid-liquid extraction method is adopted to pretreat a water sample, magnesium chloride is taken as a salting-out agent, dichloromethane is taken as an extraction agent to extract epoxy chloropropane in water, and a capillary gas chromatography and an external standard curve method are adopted to quantitatively analyze. The method has high extraction efficiency, is simple, quick and accurate, has high sensitivity and good reproducibility and can satisfy the requirements on environment monitoring and water quality analyzing work.

The invention discloses a product surface powder spraying quality monitoring analysis management system based on machine vision. Comprising a product surface coating appearance defect identification module, a product surface coating detection area division module, a spraying database, a coating detection area basic parameter acquisition module, a coating performance parameter acquisition module, a quality modeling analysis module, a supervision cloud center and a display terminal. Appearance defect detection, basic parameter detection and performance parameter detection are respectively carried out on a surface coating film of a powder spraying product, so that a spraying appearance quality coefficient, a spraying basic parameter quality coefficient and a spraying performance parameter quality coefficient corresponding to the surface coating film of the powder spraying product are obtained; therefore, whether the spraying quality of the powder spraying product is qualified or not is judged comprehensively, comprehensive quality detection of surface spraying of the powder spraying product is achieved, the defect that surface spraying quality monitoring of the powder spraying product is too one-sided at present is overcome, and the reliability of a detection result is improved.

The invention discloses a carton strength detection device, which comprises a first supporting plate, wherein the first supporting plate is provided with a PLC (Programmable Logic Controller); the upper end surface of the first supporting plate is symmetrically welded with four supporting columns; the upper end surfaces of four supporting columns are welded with a second supporting plate; the foursupporting columns perform a function of supporting the second supporting plate; a carton body is placed on the upper end surface of the second supporting plate; the rear side of the upper end surface of the second supporting plate is welded with a stand column; the upper end surface of the stand column is provided with an installation plate through bolts; the lower end of the installation plateis symmetrically provided with two hydraulic cylinders; the top ends of the two hydraulic cylinders are provided with a movable platform; and two spacing branched chains are symmetrically installed between the movable platform and the installation plate. By use of the device, the even and high accuracy detection function of the carton is realized, accidental errors which are in the presence in thesingle-point testing of the carton strength are avoided, and therefore, the carton strength detection device has the advantages of being convenient in operation, high in testing accuracy, high in working efficiency and the like.

The invention discloses a device and a method for automatically testing a drape factor of a high performance carbon fiber. The device comprises a vertically arranged support frame, a test frame horizontally fixed on the support frame, a fiber retainer A slidably fixed on the test frame, a fiber retainer B fixed at the middle part of the test frame, a fiber yarn frame which is mounted at one end ofthe support frame and is adjacent to the fiber retainer B, a tension regulator which is fixed at one end, far away from the fiber yarn frame, of the test frame and used for providing a preset tensionfor the fiber retainer A and a level gauge fixed on the test frame; a removable distance measuring sensor is arranged at the side edge of the support frame; leveling feet are mounted at the bottom ofthe support frame; and a controller connected with the distance measuring sensor by virtue of a signal is also mounted on the support frame. The device disclosed by the invention realizes breaking test integration, detection efficiency is improved, a test result is stable, and coefficient of dispersion is small.

The present invention discloses a self-diagnosis method and system for a numerical control machine, and relates to machine tool processing. When an error exceeds a standard, software is run for self-detection, which includes that system simulation operation is performed with the same process and parameters to test whether a total error meets the standard, and a machining flow is decomposed to testwhether a step error meets the standard through each step of the system simulation; and after the self-detection of the software passes, actual machining detection is performed, which includes that the actual machining is performed with the same process and parameters, the error after the completion of each machining step is detected in the machining process and compared with the standard error of each step, the two successive machining steps are decomposed for respective machining, and the total error is detected and compared with the standard error of the machining process. The software isfirst detected to determine the specific steps in which the error occurs. After the self-detection of the software, the actual machining detection is performed so that the detection efficiency is improved. The whole solution can intuitively determine the specific steps in which the error occurs, and maintenance is convenient.

The embodiment of the invention discloses an information generation method and device, electronic equipment and a computer readable medium. A specific embodiment of the method comprises the following steps: in response to a received user request sent by a target user through a terminal, obtaining a current access log and a historical access log corresponding to the target user; generalizing the access log to obtain generalization features; according to the generalization features, determining and combining request data, current behavior data, verification behavior data and historical behavior data corresponding to the target user to obtain index data corresponding to the target user; inputting the index data into a pre-trained illegal user identification model to obtain identification result information; and sending a corresponding request result to a terminal according to the identification result information. According to the embodiment, the identification accuracy is improved.

The invention discloses an auto-disturbance rejection controller parameter automatic adjustment system for the vector control of a permanent magnet synchronous motor. The auto-disturbance rejection controller parameter automatic adjustment system comprises an auto-disturbance rejection controller parameter selection index calculation module (COM) and an auto-disturbance rejection controller parameter optimization module (OPT). The COM is responsible for sampling the errors of rotating speed, d-axis current and q-axis current and the output signals of auto-disturbance rejection controllers forthe rotating speed, the d-axis current and the q-axis current and calculating a parameter selection index H; and the OPT optimizes the parameters of the three controllers by taking H as an objective function, and finally outputs the optimized parameter groups of the rotating speed, d-axis current and q-axis current auto-disturbance rejection controllers to the controllers. According to the systemof the invention, based on a lion swarm algorithm which is a swarm intelligence algorithm with excellent performance, more efficient controller parameter self setting can be realized; and the self setting is used for replacing traditional manual adjustment, and therefore, the workload of operators is greatly reduced.

The invention discloses an automatic assembly production line for elevator brake calipers. The automatic assembly production line comprises a carrying disc conveying device, a brake plate storage mechanism, a brake plate carrying disc feeding mechanism, a disc spring automatic combination mechanism, a first disc spring height measurement mechanism, a shell feeding and shell size automatic measurement mechanism, an adjusting gasket and space ring supply mechanism, a second disc spring height measuring mechanism and a manual final assembly station, wherein the brake plate storage mechanism, the brake plate carrying disc feeding mechanism, the disc spring automatic combination mechanism, the first disc spring height measurement mechanism, the shell feeding and shell size automatic measurement mechanism, the adjusting gasket and space ring supply mechanism, the second disc spring height measuring mechanism and the manual final assembly station are sequentially arranged in the conveying direction of the carrying disc conveying device. According to the automatic assembly production line, the automatic assembly production of the elevator brake calipers is realized, the product circulation process is automatically carried out, manual operation and circulation are not wasted, and the labor force is greatly saved; and the thickness measurement of disc springs, space rings and adjusting gaskets adopts automatic measurement, so that the measurement precision is high, and the installation precision of final products is ensured.

The invention discloses an automatic calibration method for a standard platinum resistance thermometer. The standard platinum resistance thermometer comprises a computer, a precise temperature measurement bridge, a change-over switch, a flexible grabbing device, an annealing furnace, a metal fixed point device, a water three-phase point bottle and a standard platinum resistance thermometer body. During working, thermometers to be detected are arranged in a waiting area according to a numbering sequence, and terminals of the thermometers to be detected are respectively connected with channels of the change-over switch, when verification is started, the computer controls the flexible grabbing device to take out the thermometer from the waiting area and put the thermometer into the fixed point device for temperature measurement, the computer controls the precise temperature measurement bridge to start measurement, judges whether a reading condition is met or not according to a preset judgment criterion and performs automatic reading, and after measurement is completed, the computer controls the flexible grabbing device to take out the thermometer from the fixed point device and send the thermometer to a next waiting area, the operation is repeated till all the measurement work is completed, the acquired data are analyzed and processed by the computer, and a verification original record is automatically generated. The standard platinum resistance thermometer is advantaged in that the whole data collection process is automatic, and manpower is saved.

The invention relates to a method for determining an SWMM water quality scouring model parameter and belongs to the crossing fields of municipal engineering and environmental engineering crossing and the like. First surface runoff water samples are obtained through a surface runoff sampling device, surface runoff water samples at different moments are obtained at the same interval time, pollutant concentration Wt is detected, and the rainfall intensity value qt at the moment t is recorded; a pollutant deposition load value is obtained by combination with detection of earth surface deposition collected in dry days, a unit area pollutant deposition amount initial value undergoes scouring subduction at the moment t to obtain a remaining pollutant cumulant Bt, and Bt, Wt and qt values at different moments in a rain are substituted into an index scouring function formula; each scattered point is drawn through the excel, a tendency chart and a tendency function are added, and values of S1 and S2 are obtained from the tendency function formula. By comparison of engineering practice monitoring results and model simulation results, water quality parameter obtaining correctness is found, and it is indicated that the method has scientificity and practical values.