18results about How to "Avoid measurement effects" patented technology

The invention discloses a rod type six-component high-precision trace rolling moment wind tunnel balance and a measurement method, and belongs to the technical field of aerospace force measurement test power measurement. According to the invention, the problems of large processing difficulty, long processing period and incapability of meeting aviation tests in research and development of micro rolling moment balances at present are solved. A longitudinal column beam, a transverse column beam and a roll-on *-shaped beam are connected between a front cone and a combined element and between a rear cone and the combined element respectively, a resistance beam is arranged on the combined element, the thickness range of sheet beams of a multi-sheet structure of the longitudinal column beam is 0.5 mm-0. 8mm, the gap range of the sheet beams is 0.5 mm-1mm, the thickness range of sheet beams of a multi-sheet structure of the transverse column beam is 0.5 mm-0. 8mm, and the gap range of the sheet beams is 0.5 mm-1mm. According to the rod type six-component high-precision trace rolling moment wind tunnel balance and the measurement method, rolling output is effectively increased, and matching output of small rolling moment and loads in other directions is achieved.

The invention discloses a crankshaft point cloud semantic segmentation method. The method comprises the steps of performing voxelization downsampling on a crankshaft point cloud model and establishing a Kd-Tree topological structure; calculating normal lines under two different support radiuses, adjusting the direction of the normal lines, and calculating a normal line differential (DoN) characteristic according to a normal line difference; obtaining the number of point neighborhoods with a small support radius, and calculating point cloud curvature and FPFH features; defining an initial target area by taking a point with the minimum number of neighborhood points as an initial seed point; searching a k neighbor point set of the seed points, taking an FPFH feature threshold value and a curvature threshold value as region growth criteria, and performing semantic judgment on a segmented region by using a DoN feature threshold value; when the neighborhood point meeting the growth criterion cannot be found, completing the growth of the current region and continuing the growth of the next region until the whole point cloud is traversed; and completing crankshaft point cloud semantic segmentation according to the number of the marked region points. The method is low in complexity, can accurately complete crankshaft point cloud semantic segmentation, and improves the universality of a crankshaft point cloud segmentation algorithm.

The invention discloses equipment and a method for measuring the river flow of a runoff type hydropower station, the influence of media such as silt on flow velocity measurement is weakened through an active measurement mode of pumping back flushing, meanwhile, the slope of the river is introduced into the flow velocity measurement process to obtain the real flow velocity of the river, and the real flow velocity of the river is calculated on the basis of the real flow velocity. The average speed of the river is obtained; then, a river channel section function is constructed to obtain the river channel average section area between the reservoir area starting point and the measuring point, and therefore the influence of river channel irregularity on flow measurement can be reduced; finally, according to the average speed and the average section area, the real flow of the river channel can be obtained. Therefore, the influence of factors such as non-uniform instantaneous flow velocity, river channel gradient and irregular river channel on flow measurement is solved, so that the accuracy of natural flow velocity measurement and flow measurement of the river channel of the runoff type hydropower station is improved; therefore, the method is very suitable for large-scale application and popularization.

This application discloses a method, tooling, and assembly structure for measuring the roundness of large cylindrical or cylindrical structures, belonging to the field of industrial measurement technology. The measurement method includes: fixing multiple measuring toolings at corresponding positions at both ends of the workpiece; and determining the theoretical initial value R of the workpiece radius extension. 延长 Determine the coordinates of the predetermined points, such that the actual distance from each predetermined point to the center of the workpiece end circle is R. 延长 The method involves setting measurement lines and measuring the actual distance between each measurement line and the outer surface of the workpiece. The roundness of the workpiece is determined by its actual outer diameter. The measuring fixture includes a connected fastening assembly and a positioning assembly, with the positioning assembly equipped with a reflective plate for positioning predetermined points. The measuring assembly structure includes multiple measuring fixtures located at both ends of the workpiece. The measurement lines corresponding to the same equally spaced positions at both ends of the workpiece are parallel. This application measures the roundness of the outer surface of a large cylinder from the outside, significantly reducing the operational difficulty of the measurement, achieving higher measurement accuracy, and simplifying the measurement of the roundness of large cylinders.

The invention particularly relates to a combined detector for an online sipping device. The combined detector comprises a beta-ray detector, a gamma-ray detector and a signal processing system, the beta ray detector adopts a plastic scintillation chamber with a high beta / gamma response ratio; the gamma ray detector adopts a scintillation crystal; the signal processing system is configured to perform beta-gamma coincidence measurement on output signals of the beta-ray detector and the gamma-ray detector; the plastic scintillation chamber is adjacent to the scintillation crystal space, and the detection areas of the plastic scintillation chamber and the scintillation crystal space are at least partially overlapped so as to jointly detect the detected gas flowing through the plastic scintillation chamber. The invention further relates to a nuclear fuel assembly damage detection method which adopts the combined detector. According to the invention, comprehensive detection of beta and gamma rays of radioactive inert gas is realized, and efficient and sensitive measurement of beta rays in large-volume radioactive inert gas is realized, so that the efficiency and accuracy of gamma-beta coincidence measurement are improved.

This utility model discloses an integrated six-dimensional portable force measuring plate, including an elastomer and a protective assembly disposed outside the elastomer. The assembly includes a hub, a force-bearing platform, and multiple strain beams. The force-bearing platform is located in the center of the hub, and the hub and force-bearing platform are connected by multiple strain beams. Multiple strain gauges are attached to different positions on the strain beams. A through hole is formed in the center of the force-bearing platform, and a bridge plate for forming a Wheatstone bridge and a data acquisition board for collecting and converting the output signals of the elastomer are disposed within the through hole. Multiple wires are led out from the strain gauges and soldered to the bridge plate to form six Wheatstone bridges, which are used to detect forces and moments in three directions, denoted as Fx, Fy, Fz, Mx, My, and Mz. Advantages: The integrated force measuring plate eliminates the need for multiple sensor splicing; multiple beams can work together to balance the force and compensate for each other, reducing the influence of off-center loading on the measurement results; multiple force measuring plates can be spliced ​​together for use.

The invention discloses a correction method and system for concentration detection of dissolved gas in transformer oil, and the method comprises the steps: respectively obtaining and storing second harmonics of the dissolved gas in the transformer oil with different preset concentrations at different temperatures, and selecting a calibration temperature, determining an inversion relation between the second harmonic peak valley value of the calibration temperature and the concentration of the dissolved gas in the transformer oil, and respectively calculating correction coefficients of other temperatures relative to the calibration temperature according to the second harmonics of the dissolved gas in the transformer oil with different preset concentrations at different temperatures; the actually measured temperature and actually measured second harmonics of the dissolved gas in the transformer oil are obtained, the peak-valley value of the actually measured second harmonics is multiplied by the correction coefficient corresponding to the actually measured temperature to obtain the corrected peak-valley value, then concentration inversion is conducted on the corrected peak-valley value according to the inversion relation, and the corrected concentration of the dissolved gas in the transformer oil is obtained. According to the invention, the influence of temperature on the TDLAS measurement result can be effectively avoided.

The invention provides a double-flow-channel turbine blast loss testing system and method based on frequency conversion control, and relates to the technical field of gas turbines, and the method comprises a variable frequency motor, a torque meter and a double-flow-channel turbine; wherein the double-flow-channel turbine is rotationally connected with the variable frequency motor through a torque meter, main shafts of all the component parts are adjusted and centered, and the torque meter measures the resistance torque and the rotating speed of the turbine in the rotating process of the variable frequency motor. The rotating speed of the turbine can be adjusted, and the power consumption and torque of the turbine at different rotating speeds are measured so as to obtain the blast loss parameter.

The invention provides an anti-interference track insulation on-line tester integrated with a signal generator and a method, and relates to the field of track insulation tests.The anti-interference track insulation on-line tester comprises a handset, a controller arranged in the handset, a signal generation assembly and an insulation resistance tester; the signal generating assembly and the insulation resistance tester are electrically connected with the controller, the controller is used for controlling the signal generating assembly to apply alternating current signals for track insulation testing to the two ends of a tested track, and the insulation resistance tester comprises a signal collecting assembly and a filtering assembly. The signal acquisition assembly is used for acquiring signals of a tested track in the process of applying alternating current signals for track insulation testing to the two ends of the tested track, and the filtering assembly is used for filtering the signals of the tested track acquired by the signal acquisition assembly. And the controller is used for calculating the insulation resistance value of the tested track according to the filtered signal of the tested track. The method has the advantage of improving the accuracy and efficiency of the track insulation online test.

This invention provides an adaptive feedback adjustment method and system for the drawing take-up line of a stamping die. The method includes triggering a grating projection device to project a grating grid onto the drawing die, controlling an industrial camera to capture an image of the lower drawing die, receiving the image of the lower drawing die captured by the industrial camera, identifying edge feature points of the drawing line in the lower drawing die image, and fitting a drawing take-up line profile based on the identified edge feature points. The fitted drawing take-up line profile is then compared with a pre-stored standard drawing take-up line to determine if the profile contains any out-of-limit areas. This invention employs a unique online measurement method, enabling adjustment of the stamping die's drawing take-up line without stopping the machine. This system is applicable to all dies and saves significant process and production costs compared to existing measurement methods that require offline shutdown.

The invention discloses a manufacturing system, method and application of a casting part embedded with a fiber grating sensor, and relates to the technical field of nondestructive detection.The system comprises the casting part embedded with the fiber grating sensor, obtained through a pouring process, used for sensing the internal strain, temperature and vibration signals of the casting part through the fiber grating sensor, converting the signal into an optical signal; the laser emitting device is used for emitting laser to the casting part embedded with the fiber grating sensor; the signal processing module is electrically connected with the fiber grating sensor and is used for receiving and processing the optical signal and converting the optical signal into internal strain, temperature and vibration data; and the data analysis module is used for receiving the internal strain, temperature and vibration data transmitted by the signal processing module in real time so as to analyze the structural health state of the casting part embedded with the fiber grating sensor. According to the invention, the fiber grating sensor is directly embedded into the casting part, so that the structure parameters of the casting part can be accurately monitored in real time.

The invention provides a water-turbine generator set thrust pad balance degree optimization method and system, and the method comprises the steps: synchronously collecting the current dynamic load pad temperature and dynamic load displacement of each thrust pad through an installed sensor when a rotor of a set rotates to any position; according to the dynamic load tile temperature of each thrust tile, calculating a dynamic tile temperature mean value of the thrust tiles of the unit, and detecting whether the thrust tiles exceeding a temperature limit value exist or not; calculating a dynamic load displacement mean value of the thrust pads of the unit according to the dynamic load displacement of each thrust pad, and detecting whether the thrust pads exceeding a load dynamic change limit value exist or not; and sending an alarm under the condition that the thrust pads exceeding the limit value are detected, and calculating an angle adjustment value of dynamic stress of each thrust pad exceeding the limit value. According to the method, the temperature balance and the stress balance of the thrust pad can be comprehensively monitored in real time, the over-limit thrust pad with the problem of poor balance degree is adjusted in time, and operation balance of the thrust pad is facilitated.

The invention discloses a high-precision non-contact displacement measuring device and method, and belongs to the technical field of displacement measuring devices.The high-precision non-contact displacement measuring device comprises a measuring machine body, a base is arranged at the bottom end in the measuring machine body, an upper fixing frame is arranged at the upper end in the measuring machine body, and buffering and damping assemblies are symmetrically arranged in the base; a universal arm is arranged at the upper end of the buffering and damping assembly, an adjusting and mounting assembly is arranged on the surface of the universal arm, a non-contact displacement sensor is arranged at one end of the adjusting and mounting assembly, and a positioning meshing assembly is arranged in the middle of the upper end of the base; according to the invention, the non-contact displacement sensor can be conveniently installed by arranging the adjusting installation assembly, the use stability of the equipment is improved, the use quality is ensured, the installation steps are simple and convenient, manpower resources are saved, the use effect of the equipment is good, the height adjustment of the non-contact displacement sensor is accurate and stable, and the measurement error is reduced.

The invention relates to the technical field of liquid level measurement, and discloses a pool automatic measuring device convenient to install, comprising: a body serving as a main part of the device and playing a role in monitoring the water level of water flow in a pool; the floating plate is arranged at the bottom of the machine body, the machine body can float on the water surface by mounting the floating plate, and a plurality of uniformly distributed floating blocks are mounted on the periphery of the floating plate; the balancing weight is arranged at the bottom of the floating plate and plays a role in enhancing the stability of the floating plate; the adjusting assembly is arranged in the floating plate, and the adjusting assembly is used for adjusting the height of the balancing weight; a plurality of evenly-distributed supporting plates are fixedly connected to the top of the floating plate. The floating plate can be fixed by inserting a plurality of anchor rods, so that the influence of water surface shaking on measurement is prevented, the stability of the floating plate can be enhanced by mounting a balancing weight, the measurement stability of the device is enhanced, and the height of the balancing weight can be adjusted by winding or unwinding a hoisting rope.

The utility model discloses an automobile seat backrest angle measuring device, which belongs to the technical field of seat angle measurement, and comprises a mounting box, the upper end of the mounting box is provided with an opening and a groove, the inner side of the groove is provided with a measuring mechanism, one side of the mounting box is provided with a protection mechanism, and the other side of the mounting box is provided with a clamping mechanism. A mounting cavity is formed in one side of the mounting box, the fixing mechanism is mounted on the inner side of the mounting cavity, the measuring mechanism is used for measuring the angle of the automobile seat backrest, the protection mechanism is used for protecting the measuring mechanism, the fixing mechanism is used for limiting the protection mechanism, and the measuring mechanism comprises a rotating shaft. According to the device, the angle measuring dial can be protected through the protection mechanism, scales on the angle measuring dial are prevented from being abraded to affect measurement, the protection mechanism can be fixed through the fixing mechanism, and fixing operation is convenient.

The invention discloses a water gauge reading method based on deep learning. The method comprises the following steps: acquiring the height information of a water gauge and the target height information of an E character; obtaining a target image, and recognizing the position of a water gauge and the position of an angular point to correct the target image; carrying out instance segmentation on an E-character target in the corrected image to obtain a recognition frame coordinate and a segmentation result of the E-character target; sorting the E-character targets from top to bottom according to the coordinates of the recognition frame, respectively calculating y coordinate value giant change times of horizontal projections of the E-character targets in the vertical direction according to segmentation results, and judging whether the E-character targets are complete or not according to the giant change times; if the updated coordinates of the identification frame exceed the position of the water gauge, the E-word target is judged to be an incomplete E-word target connected with the water surface, and the effective number of the E-word target is calculated; and calculating the current water level according to the sum of the copies of all the E-shaped targets, the height of the water gauge and the height of the E-shaped targets. According to the invention, human errors can be avoided, the influence of environmental factors on water level measurement can be overcome, and the accuracy and reliability of water level detection are greatly improved.

The utility model discloses an anti-salinity interference vanadium (III) reduced seawater nitrate analysis device, and relates to the field of analytical chemistry detection. Comprising an automatic sample injection module, a flow analysis module, a mixing-constant temperature module and a light splitting detection module, the flow analysis module comprises an injection pump, an injector and a multi-position selection valve; the multi-position selection valve is respectively connected with the automatic sample injection module, the pure water storage bottle, the sulfanilamide solution storage bottle, the N-(1-naphthyl) ethylenediamine hydrochloride solution storage bottle, the vanadium (III) solution storage bottle, the mixing-constant temperature module and the light splitting detection module through pipelines; the injector is connected with the multi-position selection valve, and the liquid amount is controlled through the injection pump.

The invention relates to the technical field of flow detection, and discloses a gas ultrasonic flowmeter signal processing method based on echo signal envelope fitting. According to the method, the parameterized mathematical model is adopted to carry out self-adaptive overall fitting on the envelope sequence of the ultrasonic echo signal, noise interference can be effectively suppressed, and the influence of waveform distortion on measurement can be overcome. According to the method, the propagation rule of the sound wave energy is restored from the noisy signal through the optimal fitting process, and the accuracy and repeatability of flight time extraction are improved. Due to the adoption of a nonlinear optimization algorithm with relatively high calculation efficiency, the real-time requirement of the system is considered while the measurement precision is ensured. According to the processing mode, the adaptive capacity of the gas ultrasonic flowmeter under the low signal-to-noise ratio working condition is enhanced, the long-term stability of metering is improved, a reliable flow measurement solution is provided for an industrial site, and the application potential of an instrument under the complex working condition is expanded.