30 results about "Current theory" patented technology

In order to overcome the problem that the current theory is not very capable of perceiving battlefields, the invention provides a method for assisting battlefields to perceive by a computer and fulfills the accuracy of the method process of assisting battlefields to perceive by the computer. The battlefield environment simulation refers to the description of battlefield environment through the simulation technique. Simulation refers to the study of an existing system or a system in design through the experiment of a system module. Computer simulation (also called mathematical simulation) refers to that the system module is applied to doing experiment on a real system or a system in design by the assistance of a computer so as to fulfill the purpose of analyzing, researching and designing the system. The system hereby refers to an organic integrity of a group of several factors which have specific functions and mutual connection for a certain purpose. The simulation of a system relates to three factors: a system, a system module and a computer, and the basic action linking the three factors are module building, simulation module building and simulation experiment.

The invention provides an after-test simulation method for inner and outer fault recognition of an ultra-high voltage alternating-current power transmission line based on a lumped parameter T model and belongs to the technical field of inner and outer fault recognition and protection of an alternating-current power transmission line. An after-test simulation time domain method for inner and outer fault recognition for solving a current response by using an equation i~N=iM-C0*duM / dt+1 / 2*R0*C0*diM / dt+1 / 2*L0*C0*d2iM / dt2 which is met by current zero sequence components on two sides of the line and made according to a Kirchhoff current theory under an outer fault of an ultra-high voltage alternating current power transmission line (the power transmission line is equivalent by using a concentrated parameter T model) in a short data window and an equation which is not met by zero sequence voltage and current components on the fault side under an inner fault is raised. The current on the other side is simulated and calculated by using the actually measured current on one side of the line according to the Kirchhoff current theory; and the current is compared with the relevance of a waveform of the actually measured current, so that the inner and outer faults of the ultra-high voltage alternating current power transmission line can be determined and recognized. The after-test simulation method has the advantages of sensitivity to inner fault recognition, reliability to outer fault recognition and the like, and is suitable for being popularized and used in an ultra-high voltage alternating current power transmission line system.

An embodiment of the invention discloses a high-voltage direct-current circuit harmonic impedance analysis equivalent model and a high-voltage direct-current circuit harmonic impedance frequency analysis method, aiming to solve the problems that a harmonic current path in a typical converter model is limited between a converter transformer and a valve bridge, stray capacitance to ground of converter transformer sleeves is ignored, and a large difference exists between a design result and an actual measurement result of the model based on a direct-current-side harmonic current theory. The high-voltage direct-current circuit harmonic impedance analysis equivalent model comprises a current converter adopting a three-pulse converter model, and the three-pulse converter model comprises a leakage current path and a converter bridge. The high-voltage direct-current circuit harmonic impedance analysis equivalent model is more accurate by taking the nature that harmonic waves are reflected by 3n times under the effect of commutation induction of the leakage current path and the converter bridge into consideration; the influences of an alternating-current system and an alternating-current filter on high-voltage direct-current circuit resonance characteristics are taken into account, so that an analysis process of the high-voltage direct-current circuit resonance characteristics is more accurate and rigorous, and results are more reliable.

The embodiment of the invention discloses a control method and a control device for a Cartesian coordinate robot. One specific implementation mode of the method comprises the following steps: obtaining initial position information and target position information of the robot in response to a received operating control instruction; determining initial reference position information and target reference position information of the robot in an established reference coordinate system; and executing the following control steps: obtaining current actual position information and current theoretical position information of the robot to determine the current reference position information of the robot, and determine whether the current reference position information is the target reference position information in the first coordinate axis direction; and in response to determination that the current reference position information is not the target reference position information, by taking the current reference position information as the initial reference position information, continuously executing a control step. The implementation mode can implement that during operation of the robot, an error produced in the first coordinate axis direction can be dynamically compensated, so that the operation efficiency is improved.

The invention discloses a substation relay protection hidden fault diagnosis method based on multidimensional mixture, which belongs to the technical field of substation protection. The method comprises the following steps: S1, collecting multidimensional parameters in an SV data transmission network, including m current sampling voltages Up and m current sampling currents Ip collected in a period T; S2, calculating the mean square error of the current actual electricity consumption Qp according to the m current sampling voltages Up and the m current sampling currents Ip; S3, judging whether the mean square error of the current actual electricity consumption Qp is greater than an electricity threshold Delta Q; if the mean square error of the current actual electricity consumption Qp is greater than the electricity threshold Delta Q, performing S4; and if the mean square error of the current actual electricity consumption Qp is not greater than the electricity threshold Delta Q, performing S5, wherein Delta Q=|Q-^|*Epsilon, Q-^ is the current theoretical electricity consumption, and Epsilon is a given setting value; S4, adding 1 to a counter Y; S5, resetting the counter Y to 0; and S6, after n periods T, when judging that Y exceeds a set maximum number Ymax, detecting that a relay protection device has a hidden fault. A hidden fault is detected by running electrical parameters. The detection rate of hidden faults is increased.

The invention discloses a bullet counting method which comprises the following steps: S1, acquiring a detected weight A1 of a magazine; S2, acquiring a theoretical total weight D1 through the detected weight A1 and the weight C of a single bullet; S3, calculating a deviation value according to an equation E1=D1 / A1; S4, acquiring a current theoretical total weight D2 according to the deviation value E1 and the weight C of the single bullet; S5, calculating a current deviation value according to an equation E2=D2-A2; and S6, judging whether the deviation value E1 is identical to the current deviation value E2 or not, if the deviation value E1 is identical to the current deviation value E2, repeating the step S4; or if the deviation value E1 is not identical to the current deviation value E2, replacing the deviation value E1 by the current deviation value E2, and repeating the step S4. The invention discloses a bullet counting device. The invention further discloses a magazine including the bullet counting device. By adopting the bullet counting method, errors caused by creep deformation of a weighing sensor can be made up, and the precision can be improved.

The invention discloses a method for lifting deep ocean water rich in nutritive salts by controlling an air bubble curtain. The method belongs to the technical field of manually lifting current. The invention overcomes the deficiency of the manual lifting current theory in the prior art by providing such a controlling method to lift deep ocean water rich in nutritive salts with different flows and densities. The method controls the air bubble curtain in a manually lifting current to lift the height of deep ocean water rich in nutritive salts so that the deep ocean water rich in nutritive salts can be effectively captured at a density surface. Based on the method, it is possible for a performer to effectively adjust for a best air injection amount according to different ocean conditions, and therefore, energy consumption is reduced, gains are increased, and assistance is provided to scientists for them to carry out manually lifting current.

The invention relates to an elimination method of the jump of a current fitting curve by a scanning electrochemical microscope on a liquid / liquid interface, comprising the steps as follows: (1) a liquid / liquid interface is established; (2) the probe of the scanning electrochemical microscope extends into an organic phase containing reduction-state species and is close to the liquid / liquid interface; the distance d from the probe to the interface and the current value of the probe are recorded; furthermore, the relationship curve between the distance d and the current value of the probe is established; (3) the distance d is standardized as L and the standardized probe current I<T><k> is fit; (4) the relationship curve of fit standardized distance and standardized current is established; (5) discrete wavelet transformation is carried out to the signals (L is more than 2) so as to extract the similar and detailed components; and (6) a minimum average detail discrete wavelet transformation method is used for eliminating the fitting current jump which is generated when L is more than 2. The invention provides the minimum average detailed discrete wavelet transformation method by the discrete wavelet transformation method, which solves the fitting current jump problem of the standard current theory fitting curve of the liquid / liquid interface at large standard distance value.

The present invention provides a separation method and system for transverse wave propagation in a crack. A collection coordinate system is rotated according to a setting angle, and if the rotation angle of the collection coordinate system is namely a fast wave polarization azimuth, the collection coordinate system is overlapped with a natural system of coordinates. If the rotation angle of the collection coordinate system is [Beta], the radial component R(t) after rotation is namely a slow wave component, and the transverse component T(t) is namely a fast wave component. Meanwhile, the energy ratio of the fast wave component and the slow wave component is an energy ratio of the radial component R(t) and the transverse component T(t) obtained through measurement, and the ratio should be equal to the tangent value of the crack direction azimuth. Through taking the relation mentioned above as a theoretical basis, it is analyzed whether the energy ratio of the radial component R(t) and the transverse component T(t) obtained through measurement after the collection coordinate system is rotated is equal to the tangent value of the rotation angle or not, and when the energy ratio of the radial component R(t) and the transverse component T(t) obtained through measurement after the collection coordinate system is rotated is equal to the tangent value of the rotation angle, the rotation angle is defined as the polarization azimuth of the fast wave. The separation method and system for transverse wave propagation in the crack are simple in the analysis operation process, fit into the current theory and have high accuracy.

The invention relates to a real-time evaluation method, device and process tower for operating efficiency of a process tower. The method includes: step 1, setting the calculation cycle and theoretical operating efficiency; step 2, obtaining the output and energy consumption of the process tower in real time; step 3, calculating the current moment of the process tower according to the output, energy consumption and calculation cycle of the process tower Operating efficiency; step 4, calculate the difference between the operating efficiency at the current moment and the theoretical operating efficiency, and obtain the operating efficiency deviation; step 5, judge the relationship between the operating efficiency deviation and the set first threshold, if the operating efficiency deviation If the value is greater than the first threshold, the energy consumption deviation value between the energy consumption of the process tower at the current moment and the theoretical energy consumption is calculated. The invention can monitor and evaluate the operation efficiency of the process tower, which is an important link in the chemical production device, in real time, thereby overcoming the defect that the operation state of the process tower can only be monitored in the prior art.