34results about How to "Meet different precision requirements" patented technology

The invention discloses a cable fault detecting and positioning method based on waveform replication. The cable fault detecting and positioning method comprises the following steps of: arranging a cable fault detecting and positioning system with an FPGA (Field Programmable Gate Array) chip as a processor; outputting reference voltage to a high-speed comparator by running an embedded NIOS soft core inside the cable fault detecting and positioning system as a control core; transmitting set pulse to a detected cable by a pulse transmitting driving circuit; acquiring the comparison result of the high-speed comparator and storing the comparison result to an SDRAM (Synchronous Dynamic Random Access Memory) by a shift register module; then changing a value of reference voltage from high to low and repeating the processes of transmitting the pulse and acquiring and storing the comparison result; and finally, reading back the stored data by the NIOS soft core, carrying out waveform replication on the data; displaying the data through an LCD (Liquid Crystal Display); analyzing the replicated waveform; and judging the types of faults and calculating the position of fault points according to the conditions of echo.

The invention discloses an automatic part processing precision detecting method utilizing a three-dimensional point cloud. Point cloud sampling is carried out on a part through a three-dimensional laser scanning technology; the sampling point cloud and a part design model are subjected to rough registering through a principal component analysis method, points are empowered according to the residual of the points in the sampling point cloud registering process, and registering intense adjustment is carried out through the method of closest point weight selecting iteration; finally, error distribution hypothetical testing and tolerance margin testing are carried out, and an evaluation result of the part processing precision is automatically generated. According to the automatic part processing precision detecting method, unqualified parts with obvious processing errors can be recognized through error distribution hypothetical testing, inferior-quality parts with the processing precisionexceeding the limited tolerance can be further recognized through tolerance margin testing, and the method has wide adaptability to automatic precision detection of traditional mechanical parts.

The invention relates to a distributed filtering network system and a design method. The system comprises the following parts: a filter network unit comprising filters distributed at different physical sites; a sensor sampling unit comprising vehicle-mounted sensors and filtering sensors, wherein the vehicle-mounted sensors are embedded in an automobile suspension system and acquire state information of the automobile suspension system, and the filtering sensors are embedded into the filters and acquire exchange information between the filters and set adjacent filters; and an event trigger unit comprising event triggers corresponding to the filters, wherein each event trigger determines event occurrence time of a corresponding filter, at the event occurrence time, the filters receive the automobile suspension system state information acquired by the corresponding vehicle-mounted sensors and the exchange information of the set adjacent filters, and otherwise, the filters do not act. Compared to the prior art, the system provided by the invention can satisfy the demand of multiple terminals for simultaneously obtaining data, can also effectively prevent filter network collapse, and is low in energy consumption, high in efficiency and high in stability.

The invention relates to an event trigger state estimating system based on markovian jumping. The system comprises a sensor sampling unit comprising a vehicle-mounted sensor used for collecting vehicle suspension system state information, an event trigger unit comprising an event trigger detector used for receiving measured data of the vehicle-mounted sensor on the basis of a periodic event trigger mechanism, a quantizer quantification unit comprising multiple communication links connected with the event trigger detector, connected with one another in parallel and each provided with a logarithmic quantizer, and an estimator network unit comprising estimators connected with the logarithmic quantizers on the communication links respectively used for conducting information transmission through a network. Compared with the prior art, the event trigger state estimating system based on markovian jumping has the advantages that parameters are easy to determine, the object estimating requirements are simple, network blocking is prevented, design is flexible, network resources are saved, external interference is resisted, and the like.

The invention is a kind of calibration method for nerve network camera with adjustable accuracy. It divides the image according to the radial deformation degree, gets a series of concentric circles as the training area of the nerve network from the initial radius, changes the amounts of division according to the deformation degree, it divides the image fine in the serious deformation area far away from the centre, and it divides the image roughly in the mild deformation area near the centre, in order to decrease the error caused by radial deformation; divides the calibrated image, uses the international coordinate as the input, the image is used as the output, forms the three outputs, two inputs BP nerve network, and trains the divided area.

The invention discloses a tracking type three-dimensional scanning system which comprises a tracker, a three-dimensional sensor, a light wave band switching unit and a calculation processing unit. Thetracker is used for capturing the pose of the three-dimensional sensor; the tracker comprises at least one tracking camera; the tracking camera is used for capturing positioning features on the three-dimensional sensor of at least two waveband light rays; the three-dimensional sensor is used for carrying out three-dimensional scanning on a to-be-scanned object to obtain three-dimensional point cloud of the to-be-scanned object under a three-dimensional sensor coordinate system; the light wave band switching unit is used for controlling switching of light wave bands of the positioning featurescaptured by the tracking camera; and the calculation processing unit is used for splicing the three-dimensional point cloud scanned by the three-dimensional sensor in a unified coordinate system in real time for three-dimensional reconstruction. By utilizing the tracking type three-dimensional scanning system provided by the invention, the scanning breadth and the scanning precision can be well considered, and the adaptability is high.

The invention discloses a method of analyzing structural reliability of an aeroengine turbine disc; a random variable mathematical model is established according to non-uniformity of turbine disc material, and a stress analysis model is established according to stress condition; PDS (probabilistic design system) in ANSYS environment is used to perform Monte Carlo sampling on random variables of a turbine disc three-dimensional model to obtain maximum stress MAXSTRESS distribution of the turbine disc under different conditions; Monte Carlo simulation tests of different levels are performed on the random variables on MATLAB (matrix laboratory) platform, and reliability of the turbine disc is calculated according to structural functions to obtain the structural reliability of the turbine disc under different conditions; sensitivity of the random variables influencing the structural reliability of the turbine disc is calculated according to sensitivity equation. The method has the advantages of high convergence speed, low cost and high precision, and theoretical basis is provided for the optimal design and reliability management for a turbine disc.

The invention relates to a wide-range high pressure resistant wire type strain gauge which comprises a cable sealing component (1), a protecting casing sealing component (2) and a wire type sensitive component (3). The wire type sensitive component (3) is subjected to effective multiple sealing protection through the cable sealing component (1) and the protecting casing sealing component (2), the cable sealing component (1) is used for protecting a cable and enables a cable joint to be sealed in the protecting casing sealing component (2), and the wire type sensitive component (3) is located in the protecting casing sealing component (2). According to the wide-range high pressure resistant wire type strain gauge, structures of both a sensitive component and a sealing component of a traditional vibrating wire type strain gauge are modified, and the problems that the strain gauge is subjected to limitation of small wire core strain capacity of the sensitive component and is insufficient in water pressure resistance are solved.

The invention relates to an aircraft infrared texture image generation method. The method comprises the following steps: Firstly, an aircraft skin three-dimensional model is established; obtaining aircraft skin temperature field data; a three-dimensional temperature model is generated, then the three-dimensional white board model is exported, mapping processing operation is carried out on the three-dimensional white board model, generating a color coding model, screenshot comparison on the three-dimensional temperature model and the color coding model, and filling the temperature data of the corresponding position point is filled into a color coding table to obtain an aircraft temperature texture image; And optical characteristic data of the aircraft is acquired, and the optical characteristic data is added into the aircraft temperature texture image to generate an aircraft infrared texture image. According to the method, the temperature is extracted point by point by using the color coding table, and the position and direction of the virtual camera are adjustable, and the size and precision of the color coding table are adjustable, so that different precision requirements can be met in the temperature extraction process, and the obtained result is very accurate when the parameter setting is appropriate.

The invention relates to an image processing technology, and discloses a statistical method of an image histogram and a system thereof. In the method and the system, identical continuous pixels are compressed in advance by means of run length encoding according to the characteristic that the identical continuous pixels exist in original image pixel data, histogram statistics of the identical continuous pixels can be finished in every operation, and the reading and writing operation steps of histogram statistics are reduced, so that the time and power consumption of histogram statistics are reduced greatly. Moreover, run length encoding is performed during acquisition of the original image pixel data, so that idle resources of a system can be utilized fully.

The invention discloses a security inspection method based on terahertz waves. The method comprises the following steps: a detection device transmits a terahertz wave beam to a human body to be inspected; the detection device receives the terahertz reflected wave of the human body to be inspected; the distance between the current reflection point of the human body to be inspected and the detectiondevice is calculated by using the terahertz reflected wave; the detection device is moved to different positions and the above steps are repeated so as to continuously measure the distance value between different reflection points of the human body to be detected and the detection device; the variation difference of a currently measured distance value relative to the distance value of an adjacentreflection point is judged in real time; if the variation difference exceeds a threshold value, it is judged that there is an abrupt change, namely, the abnormity, at the position. The invention alsodiscloses a security inspection device based on terahertz waves. The invention reduces the complexity of security inspection algorithms and security inspection devices, reduces the application cost,and simultaneously improves the scanning efficiency and the scanning speed.

The invention provides a multifunctional high-precision weighing system based on a virtual technology. The multifunctional high-precision weighing system is formed in such a way that an instrument amplifier and an amplifier are used to carry out two-stage amplification on a weak signal outputted by a constant section cantalever type sensor, an analog-to-digital converter is controlled by a singlechip to perform analog-digital conversion on the amplified signal, meanwhile, a serial port communication level translator is used to conduct the level conversion on acquired data and then sends the acquired data subjected to the level conversion to a computer through a serial port, and functions of password authentifying, unit price setting, data processing, displaying, storing, transmitting and controlling are achieved through LABVIEW software.

The invention discloses a precision-adjustable water level measuring device which comprises a base provided with a three-dimensional displacement system, a long-distance detection head is movably fixed on the three-dimensional displacement system, the long-distance detection head is communicated with an adjustable reading table, and the adjustable reading table is detachably fixed on the base; the adjustable reading table comprises a bottom plate and an inclined table top provided with a ruler, a U-shaped gas-liquid difference measuring tube is detachably fixed on the inclined table top, and the two ends of the U-shaped gas-liquid difference measuring tube are communicated with the remote detection head and the reference water tank respectively; a supporting rod for adjusting the included angle between the inclined table top and the bottom plate is arranged on the inclined table top; and a reading adjusting device is arranged on the U-shaped gas-liquid difference measuring tube. By adjusting the measurement precision, the device can meet different precision requirements of various scenes on model indexes. The invention further discloses a water level measuring method which comprises the steps of determining a measuring original point, calculating coordinates of a point to be measured, adjusting precision and measuring water level data of the point to be measured.

The invention discloses a high-precision gas mass flow control valve. A PLC controls a servo motor driver to serve as a power source; a servo motor rotates correspondingly after receiving a signal; arotating shaft of the servo motor drives a valve element to move axially through a lead screw and a limiting nut, then the opening-closing degree of the valve element and a valve seat is controlled, and finally the gas flow is controlled; a gas flow meter and a pressure sensor are connected to a gas inlet of a valve body; a flow signal output by the gas flow meter and a pressure signal detected bythe pressure sensor serve as feedback signals, the PLC receives the feedback signals and then compares the feedback signals with a system instruction, makes a judgment, and sends a new instruction tothe servo motor, and therefore flow and pressure closed-loop control is formed; and finally, closed-loop control over the position of the valve element reaches high-precision flow control.

The invention discloses a water total hardness test solution for aquaculture and aquarium as well as a preparation method and a use method of the test solution. Every 1,000 ml of the test solution contains 3.13-6.25 g of ethylenediamine tetraacetic acid (EDTA), 15-30 g of ammonium chloride (NH4Cl), 100-200 ml of strong ammonia water with the mass percent concentration of 25%-28%, 1-4 g of chrome black T and the balance of pure water. The reagent is easy to prepare, convenient to use and relatively small in measurement error, can be used for determining the hardness of a water body without a formula or a colorimetric plate, and is suitable for aquaculture and aquarium industries.

The invention discloses a water total hardness test solution for aquaculture and aquarium as well as a preparation method and a use method of the test solution. Every 1,000 ml of the test solution contains 3.13-6.25 g of ethylenediamine tetraacetic acid (EDTA), 15-30 g of ammonium chloride (NH4Cl), 100-200 ml of strong ammonia water with the mass percent concentration of 25%-28%, 1-4 g of chrome black T and the balance of pure water. The reagent is easy to prepare, convenient to use and relatively small in measurement error, can be used for determining the hardness of a water body without a formula or a colorimetric plate, and is suitable for aquaculture and aquarium industries.

The invention discloses an anti-aging drawer structure, a control method thereof and a refrigerator. The anti-aging drawer structure comprises a drawer body, wherein an ultraviolet illumination assembly is arranged in the drawer body, an illumination adjusting module is further arranged in the drawer body, and the illumination adjusting module comprises a detection unit and a control unit; the detection unit is used for detecting the projection area of objects placed in the drawer on a drawer bottom plate; and the control unit is used for controlling the illumination intensity or the irradiation area of the ultraviolet illumination assembly according to the size of the projection area. According to the anti-aging drawer structure, the control method thereof and the refrigerator, through the arrangement, after the objects are placed in the drawer, pesticide residues are eliminated by adopting ultraviolet irradiation, meanwhile, a projection area can be generated, the number of the placed objects is judged according to the area of the projection area, so that the intensity or the area of the ultraviolet illumination is adjusted, the intensity of ultraviolet rays directly irradiated on the drawer body is reduced, the aging effect of the ultraviolet rays on the drawer is weakened, and the service life of the product can be prolonged.

The invention discloses a clamp type inertia piezoelectric linear motor. The clamp type inertia piezoelectric linear motor comprises a stator fixing frame and an output rod, the stator fixing frame isof a hollow structure, the two ends of the stator fixing frame are connected with a left lever and a right lever respectively, the upper ends and the lower ends of the left lever and the right leverare horizontally provided with an upper clamp block and a lower clamp block respectively, and a wedge block is placed between the two lower clamp blocks; annular laminated piezoelectric ceramic is arranged in the stator fixing frame, the upper end of the annular laminated piezoelectric ceramic abuts against the inner surface of the upper end of the stator fixing frame, the lower end of the annularlaminated piezoelectric ceramic abuts against the upper end of the wedge block, the output rod sequentially penetrates through the stator fixing frame, the annular laminated piezoelectric ceramic andthe wedge block downwards, and the lower end of the output rod extends out of the wedge block. According to the inertia piezoelectric linear motor, the stator adopts a clamp type structure, the leftlever and the right lever can be adjusted, and different precision requirements are met; and meanwhile, the clamp type structure can improve the output thrust by increasing the positive pressure and the friction force between the clamp and the output rod during working while realizing high precision.

The invention relates to a system for cloud-aid estimation of a semi-trailer active suspension state, and a design method. The system comprises a sensor sampling unit, an event triggering unit and a filter unit, wherein the sensor sampling unit comprises vehicle-mounted sensors which are distributed on a front wheel suspension and a rear wheel suspension of a semi-trailer active suspension; the event triggering unit comprises two event triggering devices which are correspondingly connected to the vehicle-mounted sensors of the front wheel suspension and the rear wheel suspension; and the filter unit is disposed on a cloud server and comprises two filters which are correspondingly connected to one event triggering device by network. In the system, the vehicle-mounted sensors of the front wheel suspension and the rear wheel suspension are connected to the filters by one event triggering device to form two independent state estimation subsystems; and the two filters conduct state estimation of the semi-trailer active suspension according to sampling information of the sensors sent from the event triggering devices. In comparison with the prior art, the system provided by the invention has the advantages that reliable estimation of the automobile active suspension states can be achieved; automobile manufacture expenses can be reduced; and network communication burdens can be relieved.

The invention relates to image processing technology, and discloses a statistical method and system for an image histogram. In the present invention, by using the characteristics of the same continuous pixels in the original image pixel data, and using run-length coding to compress these same continuous pixels in advance, the histogram statistics of these same continuous pixels can be completed in one operation, reducing the histogram Statistical read and write operation steps, thus greatly reducing the time and power consumption of histogram statistics. In addition, run-length encoding is performed while collecting the original image pixel data, which can make full use of the idle resources of the system.

The invention is a kind of calibration method for nerve network camera with adjustable accuracy. It divides the image according to the radial deformation degree, gets a series of concentric circles as the training area of the nerve network from the initial radius, changes the amounts of division according to the deformation degree, it divides the image fine in the serious deformation area far away from the centre, and it divides the image roughly in the mild deformation area near the centre, in order to decrease the error caused by radial deformation; divides the calibrated image, uses the international coordinate as the input, the image is used as the output, forms the three outputs, two inputs BP nerve network, and trains the divided area.

The invention discloses an automatic part processing precision detecting method utilizing a three-dimensional point cloud. Point cloud sampling is carried out on a part through a three-dimensional laser scanning technology; the sampling point cloud and a part design model are subjected to rough registering through a principal component analysis method, points are empowered according to the residual of the points in the sampling point cloud registering process, and registering intense adjustment is carried out through the method of closest point weight selecting iteration; finally, error distribution hypothetical testing and tolerance margin testing are carried out, and an evaluation result of the part processing precision is automatically generated. According to the automatic part processing precision detecting method, unqualified parts with obvious processing errors can be recognized through error distribution hypothetical testing, inferior-quality parts with the processing precisionexceeding the limited tolerance can be further recognized through tolerance margin testing, and the method has wide adaptability to automatic precision detection of traditional mechanical parts.

The invention discloses a motion interference detection method for a complex multi-body device, and the method comprises the steps: scanning each part of the complex multi-body device, obtaining a surface scatter model of each part, and constructing a part initial bounding box for each part based on the part scatter model; on the basis, in the interference detection operation stage, firstly, carrying out interference detection operation between every two initial bounding boxes of all components, judging whether the initial bounding boxes need to be further subdivided or not according to the operation result, if interference occurs, outputting a current result, and otherwise, subdividing the initial bounding boxes again, and carrying out pairwise interference detection operation; respectively obtaining a bounding box model binary tree of each part in the whole operation process, traversing interference detection operation layer by layer from top to bottom between every two of the component bounding box model binary trees to realize the interference detection of the complex multi-body device. According to the invention, the motion interference analysis and collision safety detectionin a motion control process can be performed on the complex multi-body device.

The invention provides an angle iron steel seal visual identification system and method assisted by linear lasers in order to solve the problems that angle iron steel seals are poor in contrast ratio,steel seal dents are different in depth, steel seal character strings are different in length and the like. An industrial camera and a linear laser emitter are fixedly installed, and the angle iron moves on the conveying belt at a certain speed. When an angle iron steel seal passes through the linear laser, the industrial camera is controlled to shoot a series of images containing the linear laser stripes according to a certain frequency, the linear laser stripes are extracted in each image, and the extracted linear laser stripes are recombined to form a new image. The shooting frequency andthe output power of the motor are adjusted through the controller, and different precision requirements can be met. Because the concave steel seal enables the line lasers to deform locally from the original straight line, image processing is performed on the new image so as to identify the angle iron steel seal. The character extraction aims at the synthesized new image, so that the problems of incomplete one-time photographing and the like caused by overlong steel seal length do not exist, and the method is more suitable for actual requirements.

The invention discloses a method for conducting assembling, locating and boring on an aircraft canard through a servo system and relates to the field of aircraft assembly technology. According to the method, through a mode that the servo system is installed on a boring machine and a servo motor controls a boring machine workbench to move, precise locating on the aircraft canard is achieved. A position detection sensor is further arranged in the servo system and used for checking and determining the accuracy of a position. The boring machine conducts boring on a located canard support beam, and automation of locating and boring is achieved. Compared with a traditional locating method, the requirement for openness of an installation inside space is lowered greatly, and the precision is improved significantly. In addition, a plurality of canards can be located continuously, so that the efficiency and reliability are improved significantly. Due to the fact that the servo system can conduct logical operation of the rotation speed of a spindle of the boring machine and the feed speed of the workbench according to a specified program, the boring precision is further improved.

The invention relates to a method for generating an aircraft infrared texture image. Firstly, a three-dimensional model of the aircraft skin is established, data of the temperature field of the aircraft skin is acquired, and a three-dimensional temperature model is generated, and then a three-dimensional whiteboard model is derived, and the three-dimensional whiteboard model is textured to generate a color Coding model, compare the screenshots of the three-dimensional temperature model and the color coding model, fill in the temperature data of the corresponding position points into the color coding table, and obtain the temperature texture image of the aircraft; obtain the optical characteristic data of the aircraft, and add the optical characteristic data On the temperature texture image of the aircraft, an infrared texture image of the aircraft is generated. The present invention uses the color coding table to extract temperature point by point. Since the position and direction of the virtual camera are adjustable, the size and precision of the color coding table are also adjustable, so different precisions can be satisfied in the process of temperature extraction. Requirements, when the parameters are set properly, the results will be very accurate.