32 results about "Velocity factor" patented technology

The invention relates to a method for comprehensively regulating and controlling gonad mature ovulation of cheilinus undulates, which comprises the following steps: preferably selecting, breeding and feeding parent fishes; regulating and controlling water temperature, illumination and water flow to enable the parent fishes to grow; and enhancing the nutrition to promote gonad mature ovulation. The technical method is used for screening artificial ripening effective temperature, intensity of illumination and water flow velocity factor data, screening varieties and doses of artificial ripening effective nutrition enhancers, screening the time suitable for gametogenesis and fertilization of cheilinus undulates, and acquiring high-quality fertilized eggs of cheilinus undulates. The fertilization rate of the eggs of the cheilinus undulates acquired by the method is 20-86%, and the hatching rate is 30-78%. The technical method for comprehensively regulating and controlling gonad mature ovulation of cheilinus undulates, which is provided by the invention, has the characteristics of advancement, high efficiency, practicality and reliability and comprehensively regulates and controls temperature, illumination, water flow and nutrition enhancement in the breeding process of seedlings of cheilinus undulates. The invention has great application value and wide popularization and application prospects for protecting endangered species.

A method for calibrating vehicle speed measurer includes receiving GPS positioning data by GPS receiver and obtaining instrument data by said speed measurer, judging whether GPS positioning data and instrument data are in accordance to speed calibration model or not, revising speed factor originally set in said speed measurer to obtain new speed factor and storing it then using product of this new speed factor and instrument data as true speed of vehicle if it is or otherwise re-receiving GPS positioning data and instrument data.

The invention discloses a method for self adapting and adjusting the receiving velocity buffering play of a mobile multimedia broadcasting terminal, and improves the service quality of a mobile multimedia broadcasting network. The method comprises the following steps: periodically detecting a network state; calculating a receiving velocity factor which indicates the grade of the code rate of received audio and video frequency data according to the network state; arranging a buffering queue; conducting de-multiplexing for received broadcasting modulation data to obtain the audio and video frequency data; selectively decoding the audio and video frequency data according to the receiving velocity factor and storing the audio and video frequency data into the buffering queue; and playing the audio and video frequency data after the audio and video frequency data is decoded in the buffering queue. The method has the advantages that buffering data in the buffering queue can be played on the condition that signals interrupt momentarily.

The invention discloses a tracking control method for the maximum power of a photovoltaic power generation system. According to the method, a self-adaption variable step resistance incremental method is based, the dynamic performance and the steady-state performance of a photovoltaic system are integrated into account, and a photovoltaic cell output P-U characteristic curve is demarcated through a step transfer function introduced. According to photovoltaic cell parameters supplied by a photovoltaic cell manufacturer, two different fixed step sizes in fixed step zones on the left and right sides of a maximum power point are selected when the system is operated in a fixed step mode, the different fixed step sizes meet certain proportional relation, and a speed factor of the system in variable step size mode is selected. In the condition of intensive change of the external environment, compared with a fixed step resistance incremental method, the self-adaption variable step resistance incremental method can improve the response speed and the steady-state accuracy of the system; when simulating slow change condition of the external environment in natural conditions, the self-adaption variable step resistance incremental method has good dynamic performance and steady-state performance, so that the method effectively improves the tracking speed and the stability accuracy at the maximum power point.

The invention provides a method used for building a seismic data velocity model. The method comprises the steps that (A) a seismic data initial velocity model is acquired; (B) the initial velocity model is used to offset a seismic line to acquire an original offset profile; (C) each reference velocity model of the initial velocity model under at least one percentage velocity factor is acquired; (D) each reference velocity model is used to acquire a common reflection point gather; (E) the common reflection point gathers are superimposed to form a number of mini-profiles of velocity analysis points; (F) for each layer, a preferred mini-profile is determined, and the velocity of a velocity analysis point in the reference velocity model under the percentage velocity factor corresponding to the preferred mini-profile is used as the preferred offset velocity of the velocity analysis point in the corresponding layer; and (G) the preferred offset velocity of each velocity analysis point in each corresponding layer is used to replace the corresponding velocity of each velocity analysis point in the original velocity model. According to the method, the velocity accuracy of seismic data can be improved.

An inertia measurement unit calibration system based on a high-precision motion capture system comprises a data acquisition module, a posture factor module, a speed factor module and a position factormodule; the data acquisition module acquires information of position and posture of the motion capture system and acceleration and angular velocity of an inertia measurement unit; the posture factormodule is connected with the data acquisition module, and used for optimizing posture factors and calculating zero-offset parameter of a gyroscope and relative rotation among multiple coordinates of the inertia measurement unit; the speed factor module is connected with the data acquisition module and the posture factor module and used for estimating zero-offset parameter of an accelerometer according to the zero-offset parameter of the gyroscope, the relative rotation among the coordinates and the information of position and postures; the position factor module is connected with the data acquisition module and the speed factor module and used for further optimizing parameter calculated through the speed factor module according to the information of position and postures and then outputting the optimized calibrated result. The high-precision motion capture system is used for calibration, so that existing data acquisition process is facilitated, special operation is omitted, an open-source data set of truth value data including position and posture is provided, and high precision can be achieved.

The reason why a time delay system is difficult to control is that information feedback is not timely, thus a controller based on feedback information seems to be powerless to the kind of systems. Aiming at the control problem of the time delay systems, a predictive wisdom proportional-integral (PWPI) control method that does not depend on a controlled object model is invented. The PI control method regards nominal model parameters of a time delay object as model parameters of a Smith predictor, combines output of the Smith predictor with actual output of the object to form compensation outputof the system, designs a predictive wisdom PI controller, determines speed factors of the PWPI controller according to a time delay estimated value and a time constant nominal value, theoretically analyzes the stability of a closed-loop control system and the robustness of the controller, is an effective control method, and has a wide application value in the field of time delay system control.

The invention discloses a control method for the dynamic shearing displacements of a flying shear of a hot continuous rolling mill. The control method comprises the following steps: setting a standard roll speed and initial head shearing lengths, and obtaining the thicknesses of strip steels through measurements; calculating according to the standard roll speed and through an experimental combination with an actual roll speed during actual working to obtain the velocity compensation factors of the strip steels; obtaining a primary shearing compensation quantity; carrying out a secondary amendment on the primary shearing compensation quantity by virtue of the velocity compensation factors of the strip steels, and finally obtaining actual head shearing displacements. According to the control method disclosed by the invention, the shearing displacements are compensated by combining with the changes of the shearing angles of the strip steels with different thicknesses during the shearing of the flying shear and the depreciation condition of the flying shear, and then a compensation result is secondarily amended according to the characteristics of the strip steels during a shearing process and by virtue of the velocity factors, thus realizing high-accuracy shearing control.

The invention discloses a double-disturbance MPPT control method of a photovoltaic power generation system. A switch capacitor converter is employed as a control circuit of MPPT, and is composed of two switch capacitor units SC1 and SC2 and a direct current filter. A double-disturbance P&O algorithm is provided on this basis, the SC1 and the SC2 employ a variable step size algorithm, different speed factors are selected, a bidirectional complementation control mode is formed, namely, only reverse disturbance can be carried out after one enters a dead zone, forward disturbance is completed by the other one. Through the control mode, the disturbance convergence speed is raised, the dead zone problem is solved, starting can be carried out rapidly and stably, misjudgement is reduced, the oscillation phenomenon of a system output power in the maximum power point can be reduced effectively, and energy loss of a photovoltaic module is reduced.

The invention relates to the technical field of lightning monitoring systems, and more particularly to a lightning locating calculation optimization method based on genetic particle swarm mixing. Theadvantages of simple use and a fast convergence speed of a particle swarm algorithm and the advantage of high global search ability of a genetic algorithm are combined, the characteristic of the fastconvergence speed of the particle swarm algorithm is utilized to carry out optimization of a previous phase to obtain an initial population of a certain evolution degree; then optimization of a latterphase is carried out by the genetic algorithm, a local convergence speed and global search ability of solution calculation in solution space are improved, parameters such as particle swarm speed factors and genetic variation factors can be optimized through a calculation result, and highly efficient and highly precise lightning locating is realized; and problems that lightning parameters calculated and obtained by different original data combinations are larger in deviations and cannot ensure homology consistency can be avoided.

The invention provides a method and a device for preventing strip steel from deflecting. The method comprises the steps of receiving convexity values of a turning roll and a sink roll in a roll system at a cleaning section; decreasing the cylinder deflection rectification amount of the roll system according to the convexity values; and receiving a preset tension value, and guaranteeing a wrap angle of the strip steel and the roll system at the cleaning section to be in a stable state according to the tension value, wherein the turning roll and the sink roll are double-helix rolls. According to the method, through optimizing convexity and surface structures of the sink roll and the turning roll, introducing tension velocity factor, and establishing a virtuous alkali liquor circle system at the cleaning section, the technical problem that the high-speed running strip steel deflects at the cleaning section is solved.

The invention discloses a single-speed adaptive proportional-derivative control method which does not rely on a controlled object model for the control difficulty of the non-affine nonlinear uncertainsystem. According to the control method, the system dynamic and internal and external uncertainty are defined as sum disturbance, so that the non-affine nonlinear uncertainty system is transformed into a linear uncertainty system, and then an error dynamic system under the sum disturbance excitation is constructed, and the single-speed adaptive proportional-derivative controller model with the speed factor as the kernel is designed accordingly. Theoretical analysis shows that the closed-loop control system composed of SAPD controller not only has global asymptotic stability and robustness, but also has good anti-disturbance robustness. The invention has wide application value in the fields of electric power, machinery, chemical industry, transportation, aviation and aerospace.

The current invention is directed to the velocity factor. Based on the velocity factor antibodies can be classified, i.e. antibodies can be characterized on their binding properties as e.g. entropic or enthalpic antigen binder. A velocity factor based classification does not require detailed thermodynamic determinations and / or calculations. The velocity factor is the ratio of the antigen-antibody complex association rate constants ka determined at 37° C. and 13° C. As only two experimental determinations are required to calculate the velocity factor this is a fast and high-throughput suited method.

A method for calibrating vehicle speed measurer includes receiving GPS positioning data by GPS receiver and obtaining instrument data by said speed measurer, judging whether GPS positioning data and instrument data are in accordance to speed calibration model or not, revising speed factor originally set in said speed measurer to obtain new speed factor and storing it then using product of this new speed factor and instrument data as true speed of vehicle if it is or otherwise re-receiving GPS positioning data and instrument data.

The present invention relates to a method and control system to control the speed of centrifugal compressors operating within a vacuum pressure swing adsorption process to avoid an operation at which surge can occur and directly driven by an electric motor that is in turn controlled by a variable frequency drive, while subsequently operating the vacuum pressure swing process between set limits of highest adsorption and lowest desorption pressure. In accordance with present invention an optimal speed for operation of the compressor is determined at which the compressor will operate along a peak efficiency operating line of a compressor map thereof. This speed is adjusted by a feed back speed multiplier when the flow or other parameter referable to flow through the compressor is below a minimum and a feed forward multiplier during evacuation and evacuation with purge steps that multiplies the feed back multiplier to increase speed of the compressor and thereby avoid surge. The speed is then adjusted by a global speed factor which serves to adjust the average speed of the motors over all steps of the repeating cycle such that the process operates within high and low pressure limits.

Unmanned aerial vehicle (UAV) systems are a class of nonaffine nonlinear enhanced coupling multiple input multiple output (MIMO) complex systems with input constraints. In order to solve the control problem of the complex systems, the invention discloses an enhanced auto-coupling PI (Proportional-Integral) cooperative control method for a large unmanned aerial vehicle (UAV). According to the control method provided by the invention, dynamics and internal / external uncertainties of the UAV are defined as sum disturbances, the nonaffine nonlinear enhanced coupling (MIMO) complex systems are converted into uncertain MIMO linear systems, further an error dynamics system under sum disturbance excitation is established, and an enhanced auto-coupling proportional-integral (EAC-PI) cooperative control model is designed for core coupling factors through utilization of a velocity factor and an enchantment factor unrelated to a controlled object model. Theoretical analysis and a simulation resultshow that the EAC-PI cooperative control system has good global robust stability. The setting problem of PID (Proportional-Integral-Derivative) is effectively solved. The system has wide application prospect in the field of aircraft control.

The invention provides a method of setting independent weight factors and speed factors for data copies and relates to the technical field of computer. The method mainly includes: adding a weight for each data copy; reading and writing the data copies sequentially according to weight size during data reading and writing, wherein the higher the weights are, the higher the priority of reading and writing is. Return conditions of data writing success can be set, preset uniformity principles can be met according to the weights of the data copies, so that writing efficiency of a system is improved and delay is reduced; different speed factors are set according to respective performance of storage nodes, and the nodes with good performance are read and written preferentially.

The invention discloses a method for self adapting and adjusting the receiving velocity buffering play of a mobile multimedia broadcasting terminal, and improves the service quality of a mobile multimedia broadcasting network. The method comprises the following steps: periodically detecting a network state; calculating a receiving velocity factor which indicates the grade of the code rate of received audio and video frequency data according to the network state; arranging a buffering queue; conducting de-multiplexing for received broadcasting modulation data to obtain the audio and video frequency data; selectively decoding the audio and video frequency data according to the receiving velocity factor and storing the audio and video frequency data into the buffering queue; and playing the audio and video frequency data after the audio and video frequency data is decoded in the buffering queue. The method has the advantages that buffering data in the buffering queue can be played on thecondition that signals interrupt momentarily.

The invention discloses a tracking control method for the maximum power of a photovoltaic power generation system. According to the method, a self-adaption variable step resistance incremental method is based, the dynamic performance and the steady-state performance of a photovoltaic system are integrated into account, and a photovoltaic cell output P-U characteristic curve is demarcated through a step transfer function introduced. According to photovoltaic cell parameters supplied by a photovoltaic cell manufacturer, two different fixed step sizes in fixed step zones on the left and right sides of a maximum power point are selected when the system is operated in a fixed step mode, the different fixed step sizes meet certain proportional relation, and a speed factor of the system in variable step size mode is selected. In the condition of intensive change of the external environment, compared with a fixed step resistance incremental method, the self-adaption variable step resistance incremental method can improve the response speed and the steady-state accuracy of the system; when simulating slow change condition of the external environment in natural conditions, the self-adaption variable step resistance incremental method has good dynamic performance and steady-state performance, so that the method effectively improves the tracking speed and the stability accuracy at the maximum power point.

This invention involves irradiating an optical disk with laser light, pulse-driven by a high-frequency signal from an HF oscillator, and converting the output of a photo-detector that receives laser light reflected from the optical disk into an electronic pulse readout signal using a current amplifier. The pulse readout signal is converted into a temporally continuous readout signal by a peak hold circuit. The invention solves the problems of SNR deterioration of the readout signal and the difficulty of removing the impact of high-frequency modulation accompanying the increase in the readout speed factor in optical disk devices.

A robust low profile antenna well suited for deployment on the lids of cavities, such as manholes is described. The antenna is constructed from a coaxial cable for use proximate to a structural surface. The antenna is formed by folding back an outer metallic braid of an end of the coaxial cable to a length that approximately matches ¼ of a wavelength of a desired operating frequency times a velocity factor of the coaxial cable. Next, the radiative element is formed by exposing the center conductor from the end of the coaxial cable to a length that approximately matches ¼ of the wavelength of the operating frequency multiplied by the composite velocity factor being based on a dielectric encasing of the coaxial cable and the distance of the antenna from the structural surface. The antenna is oriented substantially parallel to the structural surface. The resulting antenna is of a comparable size to the coaxial cable.

A method for identifying thermal parameters of loudspeakers in different frequency bands is disclosed. Firstly, the resonant frequency of loudspeakers is measured and the thermal frequency dividing point of loudspeakers is selected. The thermal frequency division point is in the middle frequency band, which should be much larger than the resonant frequency and much smaller than the maximum operating frequency. Secondly, the influence of forced convection and eddy current is ignored at the frequency dividing point, and the voice coil temperature curve is measured at the frequency dividing point. According to the theoretical formula (expression) of voice coil temperature, the curve fitting is carried out, and the linear thermal parameters are obtained. Then, a few measuring frequency pointsare selected in the whole frequency band to measure the temperature curve of the voice coil. Based on the linear thermal parameters, the thermal parameters of forced convection and vortex are calculated. Finally, the voice coil temperature of other frequency points is predicted according to all the thermal parameters. In the frequency band below the frequency dividing point, ignoring the effect ofvortex, choosing a small number of measuring frequency points, measuring the voice coil stable temperature, calculating the total forced convection thermal resistance, and then fitting the forced convection parameters: velocity factor and displacement factor.

The invention discloses a real-time multi-scale target tracking method based on compressed sensing. The sample is modeled by extracting the normalized rectangular feature of the sampled image, which is robust to multi-scale target tracking. Due to the high dimensionality of normalized rectangular features, the invention compresses high-dimensional features based on compressed sensing, extracts scale-invariant compressed feature vectors and uses integral maps to greatly reduce computational complexity to meet the needs of real-time tracking. Use the naive Bayesian classifier to classify the compressed feature vector of the sample to determine the most likely position of the target, and use the classifier response to estimate the weight of the particles, resample the particles to prevent the degradation of the particle tracking ability, and consider the speed of the target using two factors First-order models estimate and predict particle states. The method of the invention can track the target in the video image in real time, has high accuracy, low computational complexity, and the tracking frame changes with the scale of the target in real time, meeting the needs of actual tracking applications.

The invention discloses a double-disturbance MPPT control method of a photovoltaic power generation system. A switch capacitor converter is employed as a control circuit of MPPT, and is composed of two switch capacitor units SC1 and SC2 and a direct current filter. A double-disturbance P&O algorithm is provided on this basis, the SC1 and the SC2 employ a variable step size algorithm, different speed factors are selected, a bidirectional complementation control mode is formed, namely, only reverse disturbance can be carried out after one enters a dead zone, forward disturbance is completed by the other one. Through the control mode, the disturbance convergence speed is raised, the dead zone problem is solved, starting can be carried out rapidly and stably, misjudgement is reduced, the oscillation phenomenon of a system output power in the maximum power point can be reduced effectively, and energy loss of a photovoltaic module is reduced.

The invention discloses a smart PID control method. The theoretical system for setting the three gain parameters of the PID controller is established through the speed factor zc. Not only the problemof setting the three gain parameters of traditional PID is solved effectively, global stability and strong anti-disturbance capability specialty are provided. The control method has wide application value in the fields of power, machinery, chemical industry, light industry and so on.

The invention provides a method and a device for preventing strip steel from deflecting. The method comprises the steps of receiving convexity values of a turning roll and a sink roll in a roll system at a cleaning section; decreasing the cylinder deflection rectification amount of the roll system according to the convexity values; and receiving a preset tension value, and guaranteeing a wrap angle of the strip steel and the roll system at the cleaning section to be in a stable state according to the tension value, wherein the turning roll and the sink roll are double-helix rolls. According to the method, through optimizing convexity and surface structures of the sink roll and the turning roll, introducing tension velocity factor, and establishing a virtuous alkali liquor circle system at the cleaning section, the technical problem that the high-speed running strip steel deflects at the cleaning section is solved.

The invention belongs to the technical field of motor control and in particular relates to a method for controlling acceleration and deceleration phases of an indexing mechanism of a laser strapdown inertial measurement unit to be symmetrical. The method comprises the following steps: 1) determining a stable speed factor of a rotating mechanism; 2) determining a speed factor array of the acceleration phase; 3) controlling the acceleration phase, a stable phase and the deceleration phase of the rotating mechanism. By adopting the method provided by the invention, the high symmetry of the indexing mechanism of the laser strapdown inertial measurement unit at the acceleration phase and the deceleration phase can be guaranteed, so that the north finding precision of the laser strapdown inertial measurement unit is improved.

The invention discloses a scalar network analyzer capable of performing transmission testing and reflection testing. Functions of signal source extending, spectrum display and field intensity display are added for the scalar network analyzer. The scalar network analyzer is mainly used for debugging various radio frequency devices, a proper externally-arranged attenuator is added, radio frequency loops of a transmitter and a receiver can be debugged, and field intensity measurement, interference lookup, cable fault lookup and speed factor measurement can be further performed at most of frequency band, and the scalar network analyzer is especially suitable for staged inspection of all parts of a project or a DIY production in a field, operation efficiency can be effectively improved, carrying burden can be reduced, and constriction quality can be improved.

The current invention is directed to the velocity factor. Based on the velocity factor antibodies can be classified, i.e. antibodies can be characterized on their binding properties as e.g. entropic or enthalpic antigen binder. A velocity factor based classification does not require detailed thermodynamic determinations and / or calculations. The velocity factor is the ratio of the antigen-antibody complex association rate constants ka determined at 37° C. and 13° C. As only two experimental determinations are required to calculate the velocity factor this is a fast and high-throughput suited method.