32 results about "Velocity factor" patented technology

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.

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 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 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 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 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.

A method for constructing a velocity model of seismic data is provided, comprising: (A) obtaining an initial velocity model of seismic data; (B) using the initial velocity model to migrate a survey line to obtain an original migration profile; (C) obtaining an initial Each reference velocity model with the velocity model under at least one percentage velocity factor; (D) Use each reference velocity model to obtain the common reflection point gather; (E) Superimpose the common reflection point gather into a multi-channel mini-section of the velocity analysis point ; (F) For each layer, determine the optimal mini-section, and use the velocity of the velocity analysis point in the reference velocity model under the percentage velocity factor corresponding to the optimal mini-section as the optimal migration velocity of the velocity analysis point on the corresponding layer ; (G) Replace the corresponding velocity of each velocity analysis point in the original velocity model with the optimal migration velocity of each velocity analysis point in each horizon. According to the method, velocity accuracy in seismic data can be improved.

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.