83 results about "Speed factor" patented technology

The invention discloses a compressive sensing-based real-time multi-scale target tracking method. A sample is modeled by extracting the normalized rectangle features of sampled image, and the normalized rectangle features have higher robustness for the multi-scale target tracking. The normalized rectangle features are very high in dimensionality, so that the method can be used for compressing high-dimensional features based on compressive sensing, the feature vector is compressed under the condition that the extraction scale is not changed, the computation complexity is greatly reduced by integrogram, and the demand of real-time tracking can be met. The compressed feature vector of the sample is classified by a Naive Bayes classifier, so that the most probable position of a target can be determined; the classifier is used for responding and estimating the particle weight and resampling particles so as to prevent the degeneration of particle tracking capability; furthermore, a second-order model is used for estimating and predicting the particle state under the condition that the target movement speed factor is considered. The target in video image can be tracked in real time by the compressive sensing-based real-time multi-scale target tracking method; the method is high in accuracy and low in computation complexity; a tracking frame changes in real time along with the change of target scale, so that the demand of actual tracking application can be met.

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.

The invention discloses a novel cluster head election method for wireless sensor networks. The method is characterized in that during cluster head election, a probability iteration method is used; in a probability iteration formula, node residual energy is considered, and a node energy consumption speed factor Eavecons / Econsume, a node degree factor Dnbr / Nalive, a node-to-aggregation-node distance factor dtoSINK_MAX-dtoSINK / dtoSINK_MAX-dtoSINK_MIN and the like are introduced. A mechanism of optical cluster head election can be improved to a certain degree, considered factors of cluster head election are more scientific, more reasonable and more comprehensive, uniform distribution of cluster head nodes is achieved, energy consumption of the nodes can be reduced, the life cycle of the networks is prolonged, and the novel cluster head election method can be widely applied to the wireless sensor networks.

A vibration quantity measuring apparatus and method, and a loop design method in which a vibration quantity generated in a focus and tracking loop is accurately measured to optimally design a focus and tracking loop of an optical disc drive. The vibration quantity measuring apparatus includes an error gain adjusting unit which adjusts an amplitude of a focus and tracking error which occurs where a disc rotates, so as to maintain the amplitude of the focus and tracking error constant, a loop gain adjusting unit which compares a closed loop phase of a focus and tracking loop and a predetermined reference closed loop phase, and maintains a constant gain of the focus and tracking loop to compensate for a gain difference of an actuator, and a measuring unit which calculates and outputs a vibration quantity using an error adjusted by the error gain adjusting unit and the loop gain adjusting unit, and an output of a controller which controls a focus and tracking of the disc. According to the methods and apparatus, a focus and tracking vibration quantity that occur differently depending on the type of a disc, on which data is recorded on or read from, or depending on a speed factor of a disc drive, can be measured.

The invention relates to the technical field of traffic safety facilities, and discloses a safety prompt device and prompt method for an on-ramp vehicle to merge into a main road. The device comprises a microprocessor, a millimeter wave radar and a display screen, wherein the millimeter wave radar is used for detecting the speed of the on-ramp vehicle and the distance between the on-ramp vehicle and the radar; the display screen is used for displaying the safety for the on-ramp vehicle to merge into the main road in real time; an output end of the millimeter radar is electrically connected with an I / O (Input / Output) input end of the microprocessor; an input end of the display screen is electrically connected with an I / O output end of the microprocessor; the millimeter radar is arranged on a bracket which is arranged at a tail end of a speed-up road section of a ramp to enter the main road; a detection surface of the millimeter radar faces the speed-up road section; the display screen is arranged below the millimeter radar. The selected safety evaluation index is a TTC (Time to Collision) value after a speed factor is added.

This invention involves time domain interpolation of video signals. In order to adjust the presentation speed of a video data stream, a plurality of video frames is temporarily stored in a frame buffer, and the video frame to be displayed is generated by time domain interpolation between a plurality of the stored frames.

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 belongs to the field of video technology processing. A method and apparatus for secure high-definition video rewind are particularly disclosed. The apparatus comprises: analysis module,a decoding module and a playback display module, wherein, the target code stream is analyzed by the analysis module to obtain a frame type of each frame and a frame unique identifier, GOP method is used for structured storage, at that same time, the information of each frame after decoding is selectively stored in the first level cache according to the speed factor segmentation multi-level cache strategy, the contents of the first level cache are exchanged into the second level cache according to the multi-level cache strategy, and the images in the second level cache are directly and sequentially pushed into the playing display module for reverse order display. This scheme tries to find a balance between cpu and memory consumption by multiplier and multilevel buffering, avoiding excessiveconsumption of cpu and memory, and satisfying the requirements of multipath and multiplier fluent reversal.

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 discloses a tension setting method for a vertical continuous annealing furnace. The tension setting method comprises the following steps of: setting the minimum critical buckling stressSigma Alpha of the vertical continuous annealing furnace; setting the minimum unit tension T0 for preventing running deflection of the vertical continuous annealing furnace; setting the basic unit tension T2 inside the vertical continuous annealing furnace; setting the tension T3 of each region inside the vertical continuous annealing furnace; setting the tension speed factor of the vertical continuous annealing furnace to make sure that the optimized basic unit tension T4=T3+(sigma*alpha*pi / 180)*v^2; and applying the optimized basic unit tension T4 to each region of the vertical continuous annealing furnace according to a tension characteristic curve. The tension setting method for the vertical continuous annealing furnace disclosed by the invention solves the technical problem that running deflection of band steel inside the vertical continuous annealing furnace is easily caused in the prior art, and thus the band steel can stably run inside the vertical continuous annealing furnace.

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 preparation of high-speed bearing grease, and the grease is particularly applied for lubricating high-speed bearings in the industries of electronics, machine tool manufacturing, textile chemical fiber and the like. The grease consists of base oil and thickening agent, the penetration of the prepared grease is between 200 and 340 at the temperature of 25 DEG C, and the similar viscosity is smaller than 1400 at the temperature of minus 50 DEG C. The grease can meet the lubrication of the bearing the speed factor (DN value) of which is more than 2 million, can lubricate completely in a cold environment, and produces very small noise.

The invention discloses a cell switching method and device. The cell switching method comprises the following steps: acquiring a movement speed of a terminal; and selecting a switching target cell from candidate switching cells according to the movement speed of the terminal, and switching the terminal to the switching target cell. According to the cell switching method provided by the invention, a movement speed factor of the terminal is considered, and a proper switching target cell is determined according to the movement speed, so that the problem of frequent switching of the terminal due to miss of consideration of the movement speed of the terminal in existing cell switching is solved; the switching effect is optimized; and the user experience is improved.

The invention discloses an electric power system fault diagnosis method based on an improved particle swarm optimization algorithm. The particle swarm optimization algorithm is initialized to a group of random particles, then an optimal solution is found through iteration, and in the iteration of each time, the particles update themselves by tracking two "extreme values", wherein the first extreme value is an optimal solution that can be found by the particles themselves and is called an individual extreme value pbest, and the other extreme value is an optimal solution which is currently found by the whole population and is called a global extreme value gbest. An evolution speed factor H is introduced in the iteration process of the improved particle swarm optimization algorithm, when a minimum value is sought, the H is made a global optimal value of last iteration / a global optimal value of current iteration, the evolution speeds of the particles are calculated, and when the H is lower than delta, a negative disturbance item is added to a speed updating process so as to change the motion direction of the particles. Compared to a conventional genetic algorithm, the particle swarm optimization algorithm has the advantages of high stability, good convergence characteristics and fast operation speed.

The invention discloses a method and a device for determining a downlink beam forming weight vector. The method comprises the following steps: receiving a pilot signal sent by a terminal so as to estimate the frequency offset of the terminal; judging whether the frequency offset is smaller than preset frequency offset; if the frequency offset is smaller than the preset frequency offset, determining a weight vector according to a first mode, namely acquiring a first time interval, judging whether the first time interval is smaller than a first threshold value, if so, directly determining the downlink beam forming weight vector by using an SRS (sounding reference symbol), and otherwise, determining the downlink beam forming weight vector by using a PMI (pre-coding matrix indicator); if the frequency offset is not smaller than the preset frequency offset, determining the weight vector according to a second mode, namely acquiring a second time interval, judging whether the second time interval is smaller than a second threshold value, if so, directly determining the downlink beam forming weight vector by using the PMI, and otherwise, determining the downlink beam forming weight vector by using the SRS. A speed factor and a time factor are taken into overall consideration, and a weight vector calculation mode suitable for a current scene is selected in real time, so that the calculation accuracy of the weight vector and the beam forming effect can be improved, and the downlink performance and cell capacity of a user are improved.

The invention discloses a design method of a multi-functional variable-parameter viscous damper and the damper, and relates to the technical field of shock absorbing. The design method of the multi-functional variable-parameter viscous damper includes the steps that according to the damping factor C I and the speed factor alpha I, varying with the change of the speed V of a damper valve, of the viscous damper, a constitutive relation curve of the viscous damper is divided into a plurality of phases; according to the constitutive relation curve, three curved surfaces of the damper valve in the viscous damper are designed; and the first curved surface, the second curved surface and the third curved surface correspond to the phase I, the phase II, and the phase III. According to the design method, the viscous damper can automatically adjust damping force based on the movement speed of a damper piston, and meet requirements for a plurality of application scenarios in the same bridge. The viscous damper can effectively protect the bridge against damage caused by temperature-resulted deformation, is beneficial for reducing displacements caused by wind vibration and external loads of brakes so that devices, such as the viscous damper and expansion joints, can be prevented from premature fatigue and damage, and is beneficial for improving the seismic resistance of the bridge structure.

The embodiment of the invention discloses a bus route priority determination method and device, and a bus transfer route ranking method and device. The objective of the invention is to solve a problemthat a current bus route priority determination method is bad in accuracy. The bus route priority determination method comprises: receiving location data sent by a user terminal; generating bus running track data corresponding to bus routes according to the location data; for each bus route, employing time information and position information of the location data in the bus running track data corresponding to each bus route, and determining a running speed and a departure frequency of buses on each bus route in a set time section; and employing the determined running speed and departure frequency to determine time priority of each bus route in the set time section. a running speed factor which influence a riding running time is considered, a departure frequency factor which influence a waiting time is also considered, and therefore the accuracy of the determined priority of each bus route in the set time section is very high.

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.

A method for estimating the relative speed factor parameter for a variable speed pump in a hydraulic network sufficient to maintain a fixed pressure at a control node is provided. A desired operating characteristic is determined and this is inserted into a matrix of equations describing the hydraulic system. The largely symmetrical matrix includes certain aspects of the system representing the variable speed pumps which are non-symmetrical. Non-symmetrical portions of the matrix are separated out and solved using an LU factorization technique. Non-sparse, non symmetric matrices are generated and the difference in head correction is solved for to compute the updated nodal head vector and ultimately determine the variable pump speed parameter. The invention allows estimation of the variable speed factor for a variable speed pump drive sufficient to maintain a fixed pressure at a control node. The system fully integrates variable pump speed operation with the status and control capabilities of known hydraulic network solvers.

A write pulse generating apparatus includes a control unit which provides information on an optical recording medium type and information on a recording speed factor, and a control signal generating unit which determines a multi-pulse type which is to be generated in a multi-pulse interval based on the information recording medium type and recording speed factor. The generating unit generates a signal for controlling the light emitting device driving unit to generate a write pulse having the determined multi-pulse type. A control unit sets the level of the write pulse for up to an entire interval of a write mark and / or a write space according to the optical recording medium type and the recording speed factor.

The invention discloses an intelligent uploading method of a vehicle GPS device. An intelligent uploading system includes an on-vehicle GPS intelligent positioning device, a cloud management platform, a mobile phone client and a vehicle. The on-vehicle GPS intelligent positioning device is electrically connected with an internal circuit of the vehicle, and comprises a GPS positioning module, a data processing module and a network communication module. The network communication module integrates a SIM card. The network communication module is in communication connection with the cloud management platform. The cloud management platform is in communication connection with mobile phone client and is used to query vehicle positioning data and display the vehicle positioning data on a map in real time. The method combines a speed factor, uploads a position with different upload frequencies according to the different running speed, guarantees that the distance between the positions uploaded at two adjacent time points so as to guarantee a smooth track route.

The invention discloses a temperature prediction method for a photovoltaic inverter element installed on an open type support. Firstly, a photovoltaic inverter element temperature prediction equation is established according to the function and structure, similar to those of a power transformer element, of the photovoltaic inverter element; secondly, photovoltaic inverter radiator temperature rise and inverter element temperature rise are worked out respectively; finally, the temperatures of a main electronic element capacitor and an IGBT of a photovoltaic inverter are obtained. An air speed factor c and a radiator factor k are introduced, and the radiator factor k is an important variable which can reflect thermal performance of the photovoltaic inverter; it can be precisely predicted that the radiating temperature of general inverters is + / -3 DEG C, and the differences between the values, obtained through analog computation, of radiating coefficients obtained at different air speeds and actually measured values are smaller than 10%.

A method and apparatus for reproducing data from an optical disc in which a disc inducing vibration is detected and the speed of the disc is adjusted to an appropriate speed which does not cause vibration. The method includes obtaining the frequency of vibration by subtracting the count value of track traverse pulses at the lowest speed factor from the count value of track traverse pulses at the highest speed factor; and varying the speed factor of reproducing data from the disc based upon a comparison of the obtained frequency of vibration with a predetermined base value.

For the control problem of a non-affine nonlinear uncertain system, the invention relates to a two-speed adaptive proportional-derivative (2SAPD) control method independent of a controlled object model. According to the control method in the invention, system dynamics and internal and external uncertainty are defined as total disturbance; therefore, the non-affine nonlinear uncertain system is converted into a linear uncertain system, so that an error dynamics system under total disturbance excitation is constructed; thereby, a two-speed adaptive proportional-derivative control model by takingthe central speed factor as the core is designed; the facts that a closed-loop control system composed of a 2SAPD controller has the global asymptotic stability robustness and the 2SAPD controller also has good anti-disturbance robustness are theoretically analyzed; and the two-speed adaptive proportional-derivative control method in the invention has wide application value in the fields of power, mechanisms, chemical engineering, traffic, aviation, spaceflight and the like.

The invention discloses a method for inhibiting tail-end residual oscillation of a four-degree-of-freedom cylindrical coordinate type palletizing robot. The method comprises the following steps of: acquiring signals aB(t) and aT(t) of two acceleration sensor at a large arm and a tail end of the four-degree-of-freedom cylindrical coordinate type palletizing robot; performing discrete Fourier transform on aB(t) and aT(t) to obtain aB(j omega) and aT(j omega); performing cut-off frequency calculation on aT(j omega) to obtain cut-off frequency omega c; calculating through aB(j omega), aT(j omega) and omega c to obtain a speed factor s and a position factor p; calculating through s, p and omega c to obtain a parameter for compensating moment of force, thereby obtaining compensated moment of force F; and taking F as a feedforward compensated moment of force of a joint servo motor on the waist of the palletizing robot to inhibit tail-end residual oscillation. The method has the beneficial effects that: compensated moment of force of the servo motor on the waist of the robot is established based on the signals of the acceleration sensors for solving the problem that residual oscillation is easily generated at the tail end during high-speed positioning of the four-degree-of-freedom cylindrical coordinate type palletizing robot, and the parameter for compensating moment of force is quickly optimized through an online setting mode.

The invention provides a method for automatically adjusting a clock in a visible light communication system. The visible light communication system comprises a receiving end and at least one transmitting end. The method comprises the following steps: receiving a visible light signal from a first transmitting end among the at least one transmitting end; determining the clock change parameter of the first transmitting end and the clock change parameter of the receiving end according to the visible light signal from the first transmitting end; determining the clock speed factor of the first transmitting end according to the clock change parameter of the first transmitting end and the clock change parameter of the receiving end; and updating clock information of the first transmitting end locally stored by the receiving end at a preset time interval according to the clock speed factor of the first transmitting end.

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 invention discloses a variable-step photovoltaic MPPT (Maximum Power Point Tracking) control method based on an angle of contingence. The variable-step photovoltaic MPPT control method based on the angle of contingence comprises the following steps: (1), obtaining the power-voltage characteristic curve of a photovoltaic cell; (2), obtaining a speed factor NL=1-costheta by the power-voltage characteristic curve, wherein theta=arctan(dP / du) is the angle of contingence of the power-voltage characteristic curve, P is the output power of the photovoltaic cell, and u is the output voltage of the photovoltaic cell; (3), obtaining the step Di by the speed factor NL; (4), according to the basal principle of a perturbation and observation method, obtaining the reference voltage of a proportional-integral controller Uref(i+1)=Uref(i)+ / -Di, and thus achieving the maximum power point tracking. According to the method, the problems of difficulty to select the maximum step and of appearance of dead regions or misconvergence of MPP right tracking caused by improper parameter design in current variable-step control method are solved, the maximum power point tracking speed and accuracy can be simultaneously considered, and the maximum power point output by a photovoltaic array can be accurately and rapidly tracked.