152results about How to "Reduce the difficulty of calibration" patented technology

The invention provides a multifunctional rotation device used for carrying out machine vision shooting. The device comprises a supporting foundation, a motor I, a motor mounting seat, a motor shaft coupling, a rotating shaft, a motor II, a camera supporting rack, a tray shaft coupling, a bearing tray, a camera fixing rack and a camera, wherein the motor I is fixed through the supporting foundation, the motor I is connected with the rotating shaft through the motor shaft coupling to drive the bearing tray to rotate, the bearing tray is connected with the rotating shaft through the tray shaft coupling, the motor I and the motor II are fixedly connected through the motor mounting seat, the motor II is connected with the camera supporting rack, and the camera is connected with the supporting rack through the fixing rack. When the camera is required to rotate 360 DEG to shoot a fixed to-be-shot object, the to-be-shot object is arranged on the bearing tray, the camera supporting rack is driven by the motor II to rotate, and the camera shoots after rotating a certain angle; when the camera is required not to move, the to-be-shot object rotates 360 DEG for shooting, the to-be-shot object on the bearing tray is driven by the motor I through an output rotating shaft to rotate, and the camera shots whenever the to-be-shot object rotates a certain angle. The device is advantaged in that through machine vision multi-angle rotating shooting and scanning, object surface quality detection and three-dimensional surface contour reconstruction are realized.

The invention discloses an opening degree detection method for a brake pedal of a hybrid electric vehicle. The method comprises the following steps of acquiring an opening degree analog quantity and a switching value signal of a brake pedal, wherein the switching value signal is used for driving a rear brake lamp; calibrating the opening degree analog quantity of the brake pedal by utilizing the switching value signal and identifying whether the brake pedal is stepped on; when the brake pedal is stepped on, matching the opening degree analog quantity of the brake pedal and a first reset section, if the opening degree analog quantity of the brake pedal is located in the first preset section, matching the opening degree analog quantity of the brake pedal with a second preset section; if the opening degree analog quantity of the brake pedal is located outside the second preset section, updating the opening degree analog quantity of the brake pedal; and calculating the opening degree value of the brake pedal according to the opening degree analog quantity of the brake pedal. The invention further discloses an opening degree detection device and a brake pedal device for the brake pedal of the hybrid electric vehicle; the safety coefficient of the brake pedal is improved, and the standard difficulty of the pedal is reduced.

The invention provides a micro inertial measurement unit screening method and a combined type micro inertial measurement device. In the screening method, according to a multi-position method, an angular speed conversion matrix is calculated, the spinning top z-axis zero-offset data, changing along with temperature, of the combined type micro inertial measurement device is calculated, and micro inertial measurement units are screened with the minimum curve fitting residual error, changing along with temperature, of spinning top x-axis/y-axis/z-axis zero-offset data of the combined type micro inertial measurement device as the standard; the combined type micro inertial measurement device comprises at least two micro inertial measurement units capable of measuring angular speeds of three axes. The micro inertial measurement units are arranged on an installation platform. The combined type micro inertial measurement device has the advantages that the micro inertial measurement units low in price can be combined to establish an inertial measurement system high in performance, cost is saved, higher reliability is achieved, the influences of temperature changes on spinning top zero-offset are reduced, and effective error compensation of the inertial measurement device is achieved.

The invention discloses a vehicle-mounted camera automatic calibration method and device, and a readable storage medium. According to the vehicle-mounted camera automatic calibration method, rigid targets in a plurality of road images acquired by the vehicle-mounted camera to be calibrated are identified, so that relatively large errors caused by taking changeable flexible targets such as a humanbody in the images as a calibration basis to a calibration result are avoided, and the stability and the precision level of a calibration process are improved; the method comprises the following steps: acquiring initial visual parameters of a plurality of road images so as to obtain a plurality of reference sample data; and determining the target visual parameter with the maximum possibility through the Gaussian distribution characteristics and the plurality of initial visual parameters to calibrate the vehicle-mounted camera, so that the calibration precision is improved. Besides, compared with the prior art, the method has the advantages that full-automatic calibration can be carried out without any external manual assistance, professional technical support is not needed, the calibrationdifficulty is greatly reduced, and the method has wide adaptability and advancement.

Provided is a structural light measurement sensor calibration method. The method comprises the following steps that 1, a target is put in front of a laser, laser light is projected to the target, two cameras are put on the upper portion and lower portion of the laser respectively, and laser light spots of the target can be shot; 2, the upper camera and the lower camera are controlled to synchronously shoot target images, and an image L1 and an image L2 are obtained; 3, the image L1 and the image L2 are processed respectively, and central coordinates of the light spots on the images are extracted; 4, image points are matched by means of epipolar rays for epipolar ray matching; 5, three dimensional point coordinates of points on the laser light surface are calculated; 6, the position of the target is changed, and the steps from first to fifth are repeated more than once; 7, a laser light equation is fitted through three-dimensional points. According to the structural light measurement sensor calibration method, the calibration difficulty is reduced, and application and popularization of the structural light measurement method are promoted; a simpler measuring tool is provided for social production, the production efficiency is improved, and social wealth is created.

The invention discloses a driving shaft and driven shaft centering device for agricultural machinery. The driving shaft and driven shaft centering device comprises a driving shaft fixing part (5), a driven shaft fixing part (3), a fixed long rod (4), a rotary short rod (6) and a dial indicator (7). When two shafts are centered, the axes of the fixed long rod (4), the rotary short rod (6) and a dial indicator probe (71) and the axis of a driven shaft (1) are positioned on the same plane. When the dial indicator probe (71) slidably contacts with the disk face of a disk (51) with holes, the driven shaft (1) is turned to obtain a measured value of the dial indicator (7), and axial inclination of the two shafts is determined after analysis. When the dial indicator probe (71) slidably contacts with a driving shaft (8), the driven shaft (1) is turned to obtain the measured value of the dial indicator (7), and radial inclination of the two shafts is determined after analysis. The centering device can rapidly check coaxiality of the driving shaft and the driven shaft in power transmission machinery, and is low in cost and high in accuracy.

The invention discloses a target detection method and device, and relates to the technical field of computers. A specific embodiment of the method comprises the steps of performing image detection ona collected original image to obtain category information of a target and a bounding box in the original image; clustering pixels belonging to the same target in the bounding box based on the depth information corresponding to the original image so as to perform region division on the target in the bounding box; and counting the depth value distribution of the pixels in the bounding box to obtainan area corresponding to the pixels of which the depth values are in a set depth interval, and determining the position information of the target according to the area. The bounding box is obtained byperforming image detection on the original image, the bounding box is subjected to area division by adopting a clustering mode, and then the non-target area in the bounding box is filtered and removed and the target area is reserved in combination with the counted depth value of the pixels in the bounding box, so that the precision of the bounding box of the bounding target is improved so that target detection precision is improved.

The invention provides a phase computer-generated hologram encoding error correction method based on least square fitting, and relates to the technical field of computer-generated hologram. Encoding error is corrected by adopting the least square fitting method, the rotational symmetry of a curved surface is ingeniously utilized, the position of each sampling unit is located by a radius value, a one-dimensional array penetrating through the symmetry center acts as error correction points and least square fitting nodes, and the standard encoding value of each sampling unit is solved according to a fitting equation. Difficulty of encoding error correction is reduced and efficiency of encoding error correction is also enhanced by the method. Encoding error correction comprises the steps that cutting, sampling, quantification and gray scale conversion are performed on an object plane phase with the rotational symmetry so that a phase computer-generated hologram is obtained; the one-dimensional array penetrating through the rotating center of the hologram is extracted to perform encoding error correction; the corrected one-dimensional encoding values act as the fitting nodes of the least square fitting equation and the fitting equation is established; and the radius value of each sampling unit is substituted in the fitting equation, and the standard coding value of each sampling unit is calculated and saved in a matrix so that the phase computer-generated hologram after encoding error correction is obtained. The method is suitable for encoding the curved surface with the rotational symmetry.

The invention discloses a multi-camera calibration method and device, and belongs to the technical field of machine vision. The method comprises the following steps: selecting any two cameras from a plurality of cameras as an initial camera group, and calibrating the two cameras included in the initial camera group by using images acquired by the initial camera group to obtain calibration parameters; taking the to-be-calibrated camera and the first calibration camera as a first camera group; and taking the to-be-calibrated camera and the second calibration camera as a second camera group, andcalibrating the to-be-calibrated camera based on the image acquired by the first camera group and the image acquired by the second camera group to obtain calibration parameters, the first calibrationcamera and the second calibration camera being any two cameras in the calibrated cameras. That is to say, the method does not need all cameras to collect the images containing all the mark points at the same time, and can achieve the calibration of the cameras as long as two cameras can collect the images containing all the mark points at the same time, thereby reducing the calibration difficultyof the cameras.

The invention relates to the field of multiple-spray-head ink-jet printers and provides a phase different electronic calibration system of multiple-spray-head printing spray points. The phase different electronic calibration system of the multiple-spray-head printing spray point comprises a main board, a phase logic processing unit, a first asynchronous first in first out (FIFO), a second asynchronous FIFO, a first driving circuit, a second driving circuit, a first spray head and a second spray head. By adopting an electronic calibration technology, machine calibration difficulty is reduced, and mechanical calibration mechanism is simplified. A spray head dolly direction signal is used for judging positive and negative of phase, thereby reducing complexity of the phase logic processing unit and simultaneously improving the reliability. Phase transmission is shown by adopting pulse width, thereby improving flexibility and reliability of the main board controlling phase different between the two spray heads. By means of separation of the phase logic processing unit and the main board, original main board design is retained ingeniously, development cost is reduced, and development progress is accelerated. The number of signals of the main board and the spray head driving circuits is decreased, the cost is reduced, and the signal sending reliability of the main board is improved.

The invention relates to a self-adaptive equivalent consumption minimization energy management method for a fuel cell vehicle, and belongs to the technical field of new energy. A mode of periodicallyupdating equivalent factors in an equivalent consumption minimization energy management strategy is adopted, and it is guaranteed that the updated equivalent factors are used for power distribution sothat the charge state of an energy storage cell can change in the direction of converging to a target reference value at the fastest speed in short-term future time; required power time series data of the vehicle in a short-term future time range is predicted by adopting an intelligent algorithm, and the predicted required power data is applied to local optimization to determine a short-term optimal equivalent factor; and on the basis of the equivalent consumption minimization strategy, the equivalent factors are adaptively adjusted by a local optimization method, so that maintenance capability of the charge state of the energy storage cell is improved, and the fuel economy of a power system is guaranteed to the greatest extent. The approximately optimal fuel economy of the power system is guaranteed through the approximately optimal power distribution proportion of the equivalent hydrogen consumption.

The invention discloses a collision analogue simulation method for an automobile foamed plastic material. The method comprises the following steps: carrying out a foamed plastic material sample-levelmaterial test to obtain material data including test force-displacement curves under different test force states and the failure strain of the material under different stress states; establishing an MAT*_083 material card and an MAT*_ADD_EROSION material card of the foamed plastic by applying LS-DYNA finite element analysis software in combination with the material data obtained in the step S1, and determining parameters required to be calibrated by the material cards; establishing a material test simulation model, and carrying out material test calibration including a non-failure part and a failure part; carrying out a foamed plastic high-speed impact test, substituting the calibrated material card into the foamed plastic high-speed impact simulation model, and determining a final foamedplastic high-speed impact test simulation model through foamed plastic test calibration. According to the invention, the accurate analogue simulation of deformation and fracture failure characteristics of an automobile foamed plastic material can be realized.

The embodiment of the invention discloses a parameter calibration method, device and equipment and a storage medium. The parameter calibration method comprises the steps that an engine air inlet massflow step test is carried out through a chassis dynamometer; actual temperature data of an exhaust system and all input data of a dynamic exhaust temperature model in the engine air inlet mass flow step test process are acquired; and pulse spectrum parameters of the dynamic exhaust temperature model are calibrated based on the actual temperature data and all the input data. According to the technical scheme provided by the embodiment of the invention, the engine air inlet mass flow step test is carried out through the chassis dynamometer; and the engine is accurately controlled to step from aworking state to a pulse spectrum grid point value in real time, repeated iterative testing is not needed, the calibration difficulty and the calibration cost of the dynamic exhaust temperature modelof the exhaust system are reduced, and the calibration quality and the calibration efficiency are improved.

The invention provides an optical chip packaging structure, a packaging method thereof and a photoelectric device. The optical chip packaging structure comprises a substrate; a photosensitive element,wherein the photosensitive element is borne on the substrate; a support body which abuts against a substrate, or the support body is arranged on the photosensitive element; a first optical device, wherein the first optical device and the supporting body are of an integrated structure, and the first optical device is borne on the side, away from the photosensitive element, of the supporting body;and a lead, wherein the first welding point of the photosensitive element is electrically connected with a circuit in the substrate through the lead. The optical chip packaging structure formed by supporting the optical device through the supporting body is simple and reliable, the technological manufacturing process of the optical chip packaging structure is simple, and the manufacturing cost iseffectively reduced. Due to the fact that the optical chip packaging structure is simple, wiring, calibration and the like of the optical chip packaging structure can be achieved without complex technologies in the subsequent using process of the optical chip packaging structure.

The invention discloses a method for calibrating an articulated coordinate measuring machine in combination with a numerical control machine tool. A traditional measuring machine calibration method requires a high-precision measuring instrument or auxiliary calibration tool, and has difficulty in field calibration. The method comprises installing a three-ball cone calibration tool on the main shaft of the numerical control machine tool, and setting virtual calibration rods in a defined measurement area, wherein each virtual calibration rod is a line for successively connecting t measuring points arranged at equal intervals; enabling the taper hole center of the three-ball cone calibration tool to successively position respective measuring points; after a certain measuring point is positioned, embedding the spherical measuring head of a calibration machine in the taper hole of the three-ball cone calibration tool for data sampling; for the data sampling in each time, enabling the calibration machine to measure the taper hole center of the three-ball cone calibration tool for n times within an articulated operation range in different attitudes; and processing the coordinate value ofthe measuring head obtained after the data sampling to obtain the optimal solution of the structural parameter vector A of the calibration machine. The method, by using the numerical control machine tool as a calibration instrument, improves field environment adaptability and reduces cost.

The invention discloses a mini distributed fiber temperature measuring calibration device and method. The calibration device comprises a casing; an upper panel of the casing can be opened and closed, and is provided with through holes through which tested fibers can penetrate; the casing is internally provided with a detachable fiber winding column; the bottom of the casing is provided with heating resistance wires; the casing is internally provided with a heat-transfer fluid working medium and a temperature sensor; and the temperature sensor and the heating resistance wires are connected with a controller of the calibration device. A distributed temperature measuring device calibrate the fiber temperature coefficient in a miniaturized manner within the range from normal temperature to 200 DEG C, and the test device can be used to realize calibration and demonstration of a test site.

The invention discloses a multi-dimensional optical tweezers calibration device and method based on electric field quantity calibration, and provides a one-dimensional electric field calibration device to realize three-axis electric field force calibration of particles by utilizing the polarization dependence characteristic of a tight focusing light trap. According to the method, a particle electric field force calibration system is compatible with a particle delivery and particle detection system; the complexity of the device is simplified, and the calibration complexity is weakened.

The invention discloses a method for calculating a power assist characteristic table of an electric power-assisted steering system and belongs to the technical field of automobile power-assisted steering system control. The invention aims to solve the problem of poor driving feeling of an automobile due to the difficult iterative correction and difficult driving style control of EPS basic power assist characteristic table real vehicle field test. The vehicle chassis dynamics inverse characteristic and the steering system dynamics inverse characteristic are both inherent characteristics of thevehicle. According to the method of the invention, an EPS basic power assist characteristic table is decomposed into a driving style module, a vehicle chassis dynamic inverse characteristic module anda steering system dynamic inverse characteristic module; the three modules have clear physical meanings, so that the calibration of the basic power assist table of the EPS has a theoretical basis, the calibration difficulty and workload of the EPS basic power assist table are reduced, and an EPS development period is shortened. By designing the driving style module, the driving style of the automobile can be directly controlled, the driving feeling of the automobile can be adjusted, the requirements for the driving feeling and assistance are both considered, and the quality of the EPS is improved.

The invention relates to a motion model calibration method and device and an odometer system of a dual-wheel differential robot, and belongs to the field of artificial intelligence. The motion model calibration method comprises the steps that first parameters input by a user are obtained, and the rotating times, corresponding to the first parameters, of a left wheel motor and a right wheel motor of the robot are obtained in real time, and the first parameters comprise four pieces of track information in the process of the robot motion; pose calibration parameters of the robot are determined according to the first parameters and the rotating times, corresponding to the first parameters, of the left wheel motor and the right wheel motor of the robot; second parameters input by the user are obtained, the rotating times, corresponding to the second parameters, of the left wheel motor and the right wheel motor of the robot are obtained in real time, and the second parameters comprise two pieces of track information; location calibration parameters of the robot are determined according to the second parameters, the rotating times, corresponding to the second parameters, of the left wheelmotor and the right wheel motor of the robot and the pose calibration parameters; and a theoretical motion model is calibrated according to the pose calibration parameters and the location calibration parameters of the robot. According to the motion model calibration method and device and the odometer system of the dual-wheel differential robot, professional and technical requirements for workersare low, and the calibration time is saved.

The invention discloses a control method for the starting process of a clutch transmission. The control method comprises the steps that the rotating speed v1 of an input shaft of a gearbox and a throttle opening value are detected, when the rotating speed v1 of the input shaft of the gearbox is greater than zero, a current throttle opening value a1 is detected, a current engine maximum torque p1 is calculated according to current throttle opening value a1, the clutch engaging target position b1 and the target rotating speed n1 of an engine are determined according to the current maximum torquep1, when it is detected that the clutch is engaged to the target position b1 and the engine reaches the target rotating speed n1, and the difference between the rotating speed v1 of the input shaft of the gearbox and the target rotating speed n1 of the engine is less than a first set threshold value and reaches a first set time threshold value, the impact degree is detected, when the impact degree is less than a second set threshold value and reaches a second set time threshold value, the clutch is engaged to complete starting stage control. The calibrating difficulty of the target position of the clutch is lowered, impact after the starting engagement is reduced, and the comfort of the starting process is increased.

The invention discloses a fixture for brazing of a fuel manifold. The fixture comprises a circular base (1); observation ports (2) are formed in the external circumference of the circular base (1) ina uniformly-spaced manner; a plurality of pressing units distributed in a uniformly-spaced manner are arranged on the upper end face of the circular base (1); the pressing units comprise pressing blocks (5) in threaded connection with studs (6), and supporting seats (3) below the pressing blocks (5); the studs (6) are perpendicular to the upper end face of the circular base (1); and lock nuts (7)are arranged on the pressing blocks (5) and are arranged at the tail ends of the studs (6). The problem that the end face of a spout is irregularly inclined after the brazing is solved, so that the design requirement that the planeness is less than or equal to 0.3 mm is met, the subsequent correction difficulty is lowered, the correction labor-hour is shortened, and the production efficiency is improved.

The embodiment of the invention provides a method and a system for automatically calibrating a deflection angle measuring sensor of a guiding wheel. The method comprises the following steps: S1: acquiring an average tracking error of agricultural machinery running at a set distance under the control of an automatic navigation system; and S2: if the average tracking error is judged to be not greater than a set maximum average tracking error value, when the guiding wheel is rotated to an alignment position, using a median value of the deflection angle measuring sensor as a calibration result; and if the average tracking error is judged to be greater than the set maximum average tracking error value, decreasing a measuring range of the deflection angle measuring sensor according to the medianvalue of the deflection angle measuring sensor, updating the median value of the deflection angle measuring sensor according to an intermediate value of the measuring range, and returning to S1. Theaverage tracking error is used as a degree evaluation method of the calibration effect of the deflection angle sensor of the guiding wheel, so that a support is provided for judgment of the automaticcalibration effect evaluation of the deflection angle sensor of the guiding wheel.

The invention discloses a forge piece adjusting method based on three-dimensional scanning auxiliary positioning. The method comprises the following steps: S1, model acquisition: determining at least three feature points on a part blank, and establishing a standard model and a blank model; s2, data acquisition: superposing and matching the standard model and the blank model, and measuring standard three-dimensional coordinates of the feature points by using a coordinate system of the standard model; placing the part blank on a machine tool, and measuring machine tool coordinates of the feature points; calculating a standard difference value and a machine tool difference value on the axis corresponding to any two feature points; and S3, calibration determination: performing calibration to enable the standard difference value to be close to or equal to the machine tool difference value. According to the invention, through assistance of three-dimensional scanning calculation, the calibration control target is simplified, the calibration result is clearer and predictable, the calibration difficulty of the forged piece is greatly reduced, the production period is shortened, the production cost is reduced, and the shortage risk caused by machining calibration is effectively controlled.