38results about How to "Realize online correction" patented technology

The invention discloses an electronic voltage transformer using data fusion technology and an error calibration method thereof. The error calibration method comprises the following steps of: acquiring a secondary measured voltage by using a capacitive voltage divider and a sampling resistor R, accessing the voltage to a data acquisition processor for sampling, and tracing the frequency of the voltage; accessing a signal of a temperature sensor to the data acquisition processor, and computing the temperatures of measuring points; dynamically computing a divided voltage ratio of the capacitive voltage divider according to the temperature variation of the measuring points by using data acquisition device processing software so as to modify a transformation ratio error of the transformer; dynamically computing phase deviation according to signal frequency variation by using the data acquisition device processing software so as to modify a phase error; and outputting a digital sampling value through an optical fiber interface. The device is simple in structure, safe and practical; errors caused by manufacturing factors, temperature and signal acquisition circuits and the like can be effectively modified and restrained; and the measuring accuracy, temperature stability and transient performance of the electronic voltage transformer according to a capacitive voltage division principle are improved.

The invention discloses a photovoltaic inverter IGBT module junction temperature online correction method and system considering an aging process, and belongs to the field of power electronic equipment core device reliability, and the method comprises the steps: building an IGBT model electrothermal coupling model according to a photovoltaic inverter topological structure, illumination radiation intensity and environment temperature; selecting an IGBT collector-emitter electrode on-state voltage drop as an aging parameter, and designing an on-state voltage drop sampling circuit to ensure the measurement precision; aiming at IGBT modules in different aging stages, based on a large-current and small-current injection method, establishing an aging database (test current, an aging threshold value and a calibrated junction temperature value); comparing a junction temperature value output by the electrothermal coupling model with a calibrated junction temperature value, and calibrating an aging process coefficient of an aging correction formula of the electrothermal coupling model; and comparing the IGBT aging monitoring value with the aging threshold value to judge the aging process, and selecting a corresponding aging correction coefficient to ensure the accuracy of junction temperature data.

The invention discloses a satellite navigation anti-jamming steering vector automatic correction system. Using the invention, the on-site automatic correction of the steering vector can be realized without setting an external calibration source. The invention is realized by the following technical scheme: The module down-converts the received N-channel array antenna RF signals into N-channel intermediate frequency digital signal column vectors, and divides them into two channels, one is sent to the DBF processing module for weighting processing, and the other is sent to the steering vector correction processing module. When the steering vector correction processing module sends a correction control command to the satellite navigation digital receiver and the DBF processing module, the satellite navigation digital receiver and the DBF processing module cooperate with the steering vector correction processing module to perform steering vector correction processing, and the reconstructed kth satellite The satellite's local reference signal and N channels of intermediate frequency digital signals are subjected to correlation despreading processing, and the array steering vector error complex vector in the direction of the kth satellite is calculated and the target steering vector is corrected.

The invention discloses a mechanical online dynamic balancing system with a built-in spindle, which belongs to the technical field of high-speed spindle online dynamic balancing. Including dynamic balance device, motion control system, data wireless transmission system, dynamic unbalance detection calculation system, control decision calculation system; dynamic balance device is placed in the main shaft, dynamic unbalance detection and calculation system detects the unbalance signal of the main shaft, analyzes and calculates The equivalent centrifugal force of dynamic unbalance and its vector direction and position; the control and decision-making operation system decomposes the equivalent centrifugal force into two adjustment planes of dynamic unbalance, and calculates the equivalent centrifugal force of dynamic unbalance of each plane; and formulates the Mass distribution strategy; the wireless data transmission system receives and transmits dynamic unbalance correction instructions; the motion control system is installed in the control chamber of the dynamic balance device, receives the dynamic unbalance correction instructions, and controls the operation of the motor in the dynamic balance device. The invention is suitable for various operating conditions of the main shaft, and realizes online correction of the dynamic unbalanced state of the main shaft.

The invention relates to a missile-borne MEMS (Micro-electromechanical System) gyro, and in particular to a post-bombardment gyro bias correction method. The invention solves the problem that the bias of a missile-borne MEMS gyro can lead to a great error in a missile body attitude measurement result. The post-bombardment gyro bias correction method is implemented by adopting the following steps: (Step S1) defining the moment of a missile body being 20m away from a muzzle as a zero correction moment; (step S2) initially aiming a missile-borne inertial navigation system; (Step S3) extracting a yaw angle Psi 1, pitch angle Theta 1 and rolling angle Gamma 1 of the missile body at the zero correction moment according to a real-time output of an MEMS gyro in the missile-borne inertial navigation system; (Step S4) working out a pitch angle Theta 2 and rolling angle Gamma 2 of the missile body at the zero correction moment according to (img file='DDA0001184784270000011.TIF' wi'475' he='71' / ); (Step S5) working out a zero variation of the MEMS gyro before and after the launch of the missile body according to Psi 1, Theta 1, Gamma 1, Theta 2 and Gamma 2; (Step S6) working out an accurate real-time output of the MEMS gyro. The invention is applicable to missile body attitude measurement.

The invention discloses a method and a system for detecting the suspension and dead points of polished rods in pumping wells. The detection method includes: based on the synchronous dynamometer diagram, collecting the electric power diagram X(i) of the pumping well for one stroke cycle; setting the time series x(i) based on the electric power diagram X(i), and calculating y according to the mean value filter formula '(i), obtain the corrected time series based on the corrected time series to obtain the filtered output signal y(i); obtain the variance Qd(i) of the time series x(i) and the filtered output signal y(i) ); Obtain the dead point of the suspension point based on the variance Qd(i). Its advantages are: it can realize the online correction of the electric power diagram and the indicator diagram of the pumping well, and the real-time detection of the dead point of the suspension point is helpful to judge whether the displacement sensor of the indicator diagram is normal, and improves the monitoring ability of the working condition of the pumping well. The safety is high, and the practical application is easy to install, operate and maintain.

The invention provides a continuous casting crystallizer online argon blowing flow meter measuring precision correction device comprising a box body; the box body is provided with a handle; a voltage-stabilized power source (6), a mass flow rate adjusting valve (1) and a mass flow meter (7) are arranged in the box body; the box body is provided with an electronic display screen (4) for flow display in measurement; the box body is inside provided with an external pipe (3) for intake of argon.

The invention provides a multi-coordinate machining center combination method based on vision and a movable mechanical arm, and aims to overcome the large technical defect that a movable robot, a boring machine, a milling machine, a drilling machine and the like cannot be directly combined into a multi-coordinate machining center. The method comprises the steps that machining tasks and procedures are set on the movable mechanical arm, the boring machine, the milling machine and the drilling machine; a movable mechanical arm rail and clamps are arranged, a CCD and a laser ranging device or a connect camera is arranged on the movable mechanical arm, and a plurality of light mark points are arranged on the boring machine, the milling machine and the drilling machine towards the movable mechanical arm rail; then a workpiece to be machined is moved to a preset position by the movable mechanical arm through multi-joint control of the movable mechanical arm; and meanwhile, online locating monitoring and error correction are carried out in the machining process, fault alarms are given to a machining system, and multi-coordinate machining center combination is achieved. The great technical aim of directly combining the mobile robot, the boring machine, the milling machine, the drilling machine and the like into the multi-coordinate machining center is achieved.