57results about How to "Reduce the effects of measurement errors" patented technology

A large size element measuring device based on the machine vision comprises a chassis, a large calibration block and a small calibration block, wherein the length ratio of the large calibration block and the small calibration block is 3:2-2:1, an L-shaped mobile station is connected on the chassis in a sliding way, a support bar is connected on the vertical arm of the L-shaped mobile station in a sliding way, and the sliding direction of the L-shaped mobile station is perpendicular to the sliding direction of the support bar, a rotary block is rotatably connected on the support bar, and the rotational motion plane of the rotary block is perpendicular to a plane which is decided by the sliding direction of the L-shaped mobile station and the sliding direction of the support bar, a camera support plate is rotatably connected on the rotary block, and the rotational motion plane of the camera support plate is perpendicular to a plane which is decided by the sliding direction of the L-shaped mobile station and the sliding direction of the support bar, a camera is arranged on the camera support plate, a translation device is arranged on the chassis, a white background plate is arranged on the translation device, and is located under the camera, and a steel rule for observing the movement distance of a tray is arranged on the chassis.

The invention relates to a high-reliability inertial measurement device which can be used to reduce inertial measurement device measuring random errors. The redundancy sensor inertial measurement device contains an installation pedestal, gyroscopes, accelerometers, vibration dampers and screws. The installation pedestal has 18 hedral surfaces, wherein six planes are perpendicular to a motion reference axis and a normal line of any one of the other twelve planes has an included angle of 31 Deg 43 Min 2.9 Sec to one reference axis. The gyroscopes and the accelerometers are assembled on the pedestal. Two parallel planes are respectively provided with a gyroscope and an accelerometer. On the pedestal, the vibration dampers are assembled on two parallel planes which are perpendicular to a samereference axis. According to the invention, it is ensured that parallel translation or rotation in the direction of any one reference axis can be simultaneously measured by five inertial elements. The redundancy sensor inertial measurement device has advantages of good vibration damping performance, strong environmental adaptation and high reliability, can be used to effectively raise navigation precision with the cooperation of value processing, and simultaneously is convenient to process, requires low cost, and has large practical application values.

The invention discloses a device and a method for measuring modulation transfer function. A resolution panel of the device is arranged on a support of a collimator and located at the central position in the cross-section of the collimator; the outer frame of the resolution plate is square, patterns on the resolution plate are ring-shaped strips which are concentric and alternately dark and bright with different spacing and widths. The measurement method comprises the following steps: azimuth angle theta of the direction which is needed to be measured is served as the center; micro angle is continued at the left and right directions of the azimuth angle to be served as a processing area; ring-shaped strip area image of space direction and space frequency of the resolution plate in the processing area is measured; through data processing, the maximum value and the minimum value of the gray value of the image is worked out, thus obtaining the contrast ratio of the images in the range of the direction which is needed to be measured and figuring out the modulation transfer function value. In the invention, ring-shaped resolution images of the resolution plate is employed, so that not only MTF value of a photoelectric device in the horizontal direction and the vertical direction is obtained, but also MTF value in any space directions can be measured.

The invention belongs to the technical field of measuring and relates to a digital dimple depth gauge which is used for measuring the relative/absolution depth of a dimple so as to detect whether the depth of the dimple is in an allowed error range or not. The digital dimple depth gauge comprises a gauge shell, a gauge lower cover, a support leg, a sleeve, a measuring column, a large gland I, a small gland, a guide column, a measuring sleeve, a displacement sensor, a measuring module shell, a measuring module rear cover, a gauge upper cover, a display module, a power switch, a battery, a handle end cover, a large gland II and a collecting plate. The digital dimple depth gauge has the advantages that the depth of the dimple is evaluated by the displacement change of the internal measuring column in the standard dimple and the internal measuring column in a to-be-measured dimple, the displacement sensor is mounted at the top end of the measuring column, the displacement change of the measuring column can be converted into an analog signal, and the analog signal can be processed by a data collecting system to obtain a precise measuring result.

The invention relates to a method for determining lifting force and resistance moment of a spiral wing. According to the method, firstly, a laser three-dimensional imaging method based on a cooperative target is utilized for scanning to obtain three-dimensional point cloud of the spiral wing, and then, the feature of centrosymmetry of the spiral wing is utilized for analyzing one blade. Firstly, the blade is divided into n equal parts, next, the geometric feature of each part is extracted, in addition, the lifting force coefficient and the resistance coefficient are calculated, then, the lifting force coefficients of each part are superimposed, the resistance coefficients are superimposed, and the lifting force coefficient and the resistance coefficient of the spiral wing are obtained. Finally, the lifting force coefficient and the resistance coefficient are substituted into a spiral wing lifting force and angular velocity relational expression deduced according to an air resistance model and a received resistance moment and angular velocity relational expression of the spiral wing, and the lifting force and resistance moment of a spiral wing can be determined. The method has the advantages that the spiral wings in any shapes can be scanned, in addition, the lifting force and angular velocity relationship and the resistance moment and angular velocity relationship of the spiral wing is given, and wide applicability is realized.

The invention discloses a method for diagnosing defects of an intelligent substation secondary system based on multi-parameter information fusion. The method comprises the following steps of: 1) establishing an information fusion model for diagnosing the defects of the secondary equipment; 2) establishing an expert database for diagnosing and analyzing the defects of the secondary equipment; 3) collecting original data information of the secondary equipment; 4) performing information fusion; and 5) outputting a diagnosing result. According to the method disclosed by the invention, on the basis of reference to the existing information fusion method, according to the collected reference data and electric power test data, a self-adaptive algorithm is utilized to optimize a network and information induction-deduction technique; the defects of the electric secondary equipment are comprehensively diagnosed; the relation network is constructed by dividing the defect characteristic parameters according to the logic relation between different defect characteristic information; the defect reasons of the secondary equipment can be reflected from different sides; the elementary probability distribution assignment for an evidence is improved according to the output of uncertain reasoning of the evidence; the reliability of the evidence for recognizing single disabled mode is fully reflected.

The invention belongs to the fields of machinery and test, and in particular relates to a small force measuring device. The small force measuring device comprises a workbench, a vertical ruler, a silk yarn, a horizontal ruler, a horizontal bracket, a dial needle, a positioning nut and weights, wherein the workbench consists of a horizontal platform, a vertical rod and a suspension arm; one end of the silk yarn is tied to the suspension arm, and the other end of the silk yarn is hung with the weight; the vertical ruler is fixed on the vertical rod of the workbench, and the horizontal ruler is fixedly connected with the horizontal platform of the workbench; one end of the horizontal bracket is used for fixing the fixing part of a measured object, and the other end of the horizontal bracket is provided with a positioning mechanism; and the movable part of the measured object is fixed with the dial needle. The device can measure small force through utilizing a simple principle, is reasonable and reliable in scheme and low in part dependence, does not use precise parts and is low in design and manufacturing cost; the temperature and humidity have small influence on a measurement result, and the device is low in environmental requirements; the device is simple in structure and high in measurement precision; the device is convenient to operate, does not need special training, and does not have special skill requirements, and data are convenient to read; and the device can also be a calibration device of a high-precision force transmission device.

The invention provides a method used for identifying the temperature of an electrolytic cell polar plate. The method comprises the following steps that: S1: obtaining the visible light image and the thermal image of the electrolytic cell, and carrying out corresponding registration on the visible light image and the thermal image to obtain a space position thermal image; S2: matching the visible light image independently with the standard edge templates of the electrolytic cell and the polar plate to obtain the space position image; and S3: on the basis of the space position thermal image andthe space position image, identifying the real-time temperature value of the polar plate. By use of the method used for identifying the temperature of the electrolytic cell polar plate, the accuracy and the reliability of polar plate temperature identification can be effectively improved.

The invention discloses an ionized layer obscuration retrieval method based on two-parameter mixture regularization. The ionized layer obscuration retrieval method is characterized by including the steps that 1, satellite observation data are preprocessed to obtain observation values; 2, a GPS precise ephemeris is used for obtaining satellite coordinates of the needed moment through interpolation; 3, the GPS double-frequency observation values are used for calculating the TEC on a propagation path; 4, a two-parameter mixture regularization method is used for retrieving the electron density of an ionized layer. The calculation precision of the electron density of the ionized layer is improved, the influence of measurement errors can be greatly reduced, and therefore the retrieval precision of the electron density is improved.

The invention provides an oil-paper insulation equipment aging state identification method based on Raman spectrum clustering analysis. The method comprises the following steps: respectively acquiringa plurality of oil-paper insulation samples of a known aging stage and an unknown aging stage through an oil-paper insulation thermal aging experiment; acquiring Raman spectrum data of a plurality ofoil paper insulation samples in a known aging stages and unknown aging stage, and carrying out standardization processing; adopting a principal component analysis method to extract Raman spectrum characteristic quantity of the standardized oiled paper insulation samples in the known aging stage, and establishing an oiled paper insulation aging evaluation model based on a clustering analysis method; and inputting the Raman spectrum characteristic quantity of the oiled paper insulation sample in the unknown aging stage into the model for clustering analysis to obtain the aging stage of the oiled paper insulation sample in the unknown aging stage. According to the invention, on the basis of Raman spectrum measurement, the oilpaper insulation aging evaluation model is established, aging stateanalysis is carried out, and diagnosis of the overall aging state of the on-site oilpaper insulation equipment can be rapidly and effectively realized.

The invention provides a heavy metal ion measurement method and a heavy metal ion measurement device, wherein measurement error caused by impurities in a liquid sample can be reduced, while the exsolution and disbanding of electrodeposited heavy metal due to the liquid replacement can be avoided. Therefore, the concentration of heavy metal ions can be measured at a high precision. After the heavy metal deposits on a conductive diamond electrode (5), when the reduction potential of the conductive diamond electrode (5) is lower than the reduction potential of the heavy metal as the measurement object, the liquid sample is at least partially displaced into acetic acid buffer solution. Then, the potential of the conductive diamond electrode (5) is scanned toward a higher reduction potential. Therefore, the heavy metal electrodeposited on the conductive diamond electrode (5) is dissolved into the acetic acid buffer solution.

The invention discloses a loop auxiliary underwater positioning method without time synchronization. The loop auxiliary underwater positioning method without the time synchronization includes that firstly, each node completes link symmetry detection and acquires the symmetry link length by sending hello information once and sending distance measurement information once, then a water surface anchor node sends self coordinate information once, and completes positioning of a part of nodes by using distance and coordinate information, and the nodes which are positioned also send self coordinate information once, and performs iteration positioning, and finally a loop auxiliary method is adopted for nodes which are not positioned, coordinates and distances of neighbor nodes which are connected through asymmetry links are obtained, and accordingly positioning is completed. The nodes which are positioned can send the self coordinate information once, trigger a new iterative process, and furthermore enlarge a positioning coverage range, and complete the whole positioning process. The loop auxiliary underwater positioning method without the time synchronization can meet positioning requirements high in accuracy and large in coverage range, and effectively eliminates influence of the underwater asymmetry links on the node positioning under the condition that the time synchronization does not exist.

The invention discloses a three-dimensional follow-up constant force hanging device which comprises air floatation guide tracks, a constant force output device, pulley blocks and suspending ropes, wherein a transverse air floatation guide track is connected with a longitudinal air flotation guide track; horizontal brackets are mounted on two sides of the transverse air floatation guide track; six pulley blocks are provided and are respectively mounted below the transverse air floatation guide track, the longitudinal air flotation guide track and the horizontal brackets; a first suspending rope and a second suspending rope are connected with a hanging base; a hanging objective workpiece is hung on the hanging base; and the first suspending rope and the second suspending rope are respectively wound on the pulley blocks and are connected with the constant force output device. According to the three-dimensional follow-up constant force hanging device, as passive follow-up of the air flotation device is utilized, influence on measurement errors in active follow-up which is achieved through sensors, motors and guide tracks is eliminated, and the precision in follow-up is improved; as a constant hanging force is output through a constant force output cylinder, influence of an inertia force of weight reduction weights is avoided, and high-speed follow-up is achieved; and as the objective workpiece is smartly connected with the constant force output device through the pulley blocks, the plane follow-up of the air flotation device is not affected, constant force hanging is achieved, the stability is good, and the precision is high.

The invention provides a system for calibrating an inertial platform system gyroscope torquer coefficient. The inertial platform system is placed on a placing pedestal, power is on till work is normal, and rotation of a platform body is carried out, so that a calibrated gyroscope is in a vertical position; a platform body horizontal axis is accurately locked and controlled according to a horizontal direction frame angle; start time of a positive direction torque applied to the gyroscope and a negative torque applied to the direction gyroscope is recorded, and stop time of a positive direction torque applied to the gyroscope and a negative torque applied to the direction gyroscope is recorded. The coefficient is obtained by calculating vertical direction framework angle sensor pole pairs. The calibrating method reduces requirements on unlevelness of the platform system placing pedestal, and improves calibrating precision of the torquer coefficient.

The invention relates to a battery power attenuation degree detection method for detecting attenuation degree of power batteries in an electromobile. The method includes following steps: judging whether the power batteries are within an effective range or not at current moment, if yes, detecting resistance value Rj of the power batteries at the current moment, and if not, returning to continue judging; according to the resistance value Rj, calculating and storing resistance factor betaj of the power batteries at the current moment; judging whether the stored resistance factors reach estimated quantity N, if yes, entering a next step, and if not, returning to the first step; calculating minimum mean square error of all stored resistance factors betaj to obtain a minimum mean square resistance factor beta; calculating an attenuation degree estimated value epsilon according to the minimum mean square resistance factor beta; according to the attenuation degree estimated value epsilon, judging attenuation degree of the power batteries. Compared with the prior art, the method has the advantages of high detection accuracy, freeness of noise influence and few detection errors.

The invention discloses a testing method of an energy storage battery for a charging pile. The method comprises the steps of determining an electric discharging parameter for performing electric discharging testing on the energy storage battery; performing electric discharging testing on the energy storage battery according to the electric discharging parameter; acquiring an electric discharge curve of the energy storage battery in the electric discharging testing process; searching a template curve which matches an electric discharging curve of the energy storage battery in the electric discharging testing process, and determining the operation state of the energy storage battery according to the matched template curve. The testing method settles a technical problem of relatively long time consumption for performing electric discharging testing on the energy storage battery in prior art. According to the method of the invention, a resistance factor beta is used as a determining standard for attenuation degree; because the resistance factor beta is a parameter which is unrelated with temperature, the testing method of the invention can effectively reduce measurement errors of voltage, current and temperature.

The invention relates to a large-scale high-speed rotary equipment error measurement and separation method based on laser sensing. The large-scale high-speed rotary equipment error measurement and separation method comprises the following steps of: analyzing errors of large-scale high-speed rotary equipment, and establishing a large-scale high-speed rotary equipment error measurement model based on laser sensing; establishing a measurement optimization objective function, and determining a solution bias error; acquiring a precise parameter error value by means of measurement equipment and an implementation platform according to the solution bias error, and performing experimental verification on the solution bias error; and correcting the solution bias error by adopting a correction model,repeating the correction until a precision value is met, and ending the measurement. According to the large-scale high-speed rotary equipment error measurement and separation method, the measurementposition error of the measurement sensor can be obtained, and the error in the measurement process can be effectively compensated, so that the measurement precision is effectively and precisely improved; precise measurement of measured parameters can be realized, and the measurement precision is improved; and different precise models can be established during measurement of different errors, so that the measurement precision is further improved, and the separation of the errors is realized.

The invention discloses a road gradient measuring method and a road gradient measuring system. The road gradient measuring method comprises the steps of: acquiring calibration values of a roll angle and a pitch angle of a detection vehicle measured by means of an inertia measurement instrument; acquiring a first roll angle and a first pitch angle of the detection vehicle at each measurement point,acquiring a group of first measurement values of each measurement point measured by means of a first range finder group, and acquiring a group of second measurement values of each measurement point measured by means of a second range finder group; calculating to obtain a transverse included angle between the detection vehicle at each measurement point and the road surface of a road; calculating to obtain a longitudinal included angle between the detection vehicle at each measurement point and the road surface of the road; correcting the first roll angle of each measuring point to obtain a second roll angle of each measuring point; correcting the first pitch angle of each measurement point to obtain a second pitch angle of each measurement point; and calculating a tangent value of the second roll angle and the tangent value of the second pitch angle of each measurement point, so as to obtain a cross slope gradient and a longitudinal slope gradient of the road at each measurement point.The road gradient measuring method and the road gradient measuring system are high in precision.

The invention provides a reflector coupling critical finding method and device and a storage medium, and relates to the technical field of semiconductor lasers. The reflector coupling critical finding method comprises steps of reducing the height of a reflector by one step length, and obtaining the power of the reflector after the height of the reflector is reduced by one step length; if the power loss before and after the reflector is reduced by one step length exceeds the allowable threshold value, judging whether the power loss exceeding the allowable threshold value is caused by measurement fluctuation; if the power loss exceeds the allowable threshold value and is not caused by the measurement fluctuation, judging whether the current height of the reflector exceeds the maximum target critical height after being lifted by one back-lifting step length; if the current height of the reflector does not exceed the maximum target critical height after being lifted by one back-lifting step length, lifting the reflector by one back-lifting step length, wherein the step length is larger than the back-lifting step length. According to the reflector coupling critical finding method and device and the storage medium provided by the invention, a better reflector critical height position can be found on the premise that the power loss conforms to expectation.