135 results about "Phase plane" patented technology

The present invention provides an urban traffic system state visualization evaluation method based on traffic flow characteristics. Said method includes the following steps: A, in specific road section collecting real-time signal waveform whose continuous time is not less than three months, forming traffic flow state parameter; B, making traffic flow state parameter undergo the process of signal filter treatment so as to obtain traffic flow sample population; C, calculating average value and standard difference of all the samples in sample population, and using ratio value of standard difference and average value as sample discrete coefficient; D, according to traffic flow multidimensional state parameter strong aggregation characteristics forming and optimizing standard characteristic-phase plane graph for evaluation; and E, placing historical data, current data and predictive data of traffic system on the standard phase graph, and visually distinguishing running state of traffic system and its change tendency.

Systems and methods for converting a picture frame rate between a source video at a first rate and a target video at a second rate. A system may include a phase plane correlation calculator configured to determine a first motion vector estimate. The system may further include a global motion calculator configured to determine a second motion vector estimate based on the previous frame data, the current frame data, and the first motion vector estimate. The system may also include a motion compensated interpolator for assigning a final motion vector through a quality calculation and an intermediate frame generator for generating the intermediate frame using the final motion vector.

The invention discloses a method and a device for planning a robot time optimal trajectory based on a dynamic model. The method for planning the robot time optimal trajectory comprises the following steps: converting joint motion constraint and geometric path constraint to a parameter space through a robot motion trajectory predetermined by dynamics modeling and parameterization; taking shortest time as an objective structural optimization problem, and solving through a numerical integration method to obtain an optimal motion parameter of the robot; and carrying out spline curve smoothing on acceleration for three times on a phase plane by considering the problem of joint vibration caused by sudden change of the acceleration. Compared with the conventional trapezoid acceleration trajectoryplanning method, the motion parameter of the robot can be optimized under the joint motion constraint and the geometric path constraint; the high-speed motion of the robot can be achieved; the performance of a joint motor is fully used; the motion speed of the robot can be further improved; pitch time for executing tasks is reduced, so that the operation efficiency of the robot is improved; and the method and the device have great significance to improvement of overall performance of the robot.

The invention provides a high-performance elastic alloy material for an aerial hyperbaric cabin. The production method of the high-performance elastic alloy material comprises the following steps: (1) vacuum melting; (2) electroslag refining; (3) forging an ingot billet; (4) hot-rolling molding; (5) cold drawing; and (6) performing heat treatment. The high-performance elastic alloy material obtained by the method has high tensile strength up to 160 / 250(MPa); a wrapping test proves that the alloy material is not ruptured after being wound around not less than 15 circles, which is obviously superior to the national standard; and in the eventthat the alloy material is bent for 90 degrees forwardly and reversely on the same phase plane, the outer side of the bent position is not cracked and ruptured.

The invention relates to a resonant earthed system fault line selection method utilizing fuzzy K-means clustering. The resonant earthed system fault line selection method comprises the following steps of 1 performing stretching transformation treatment on transient-state zero-sequence current of each line to improve similarities of transient-state zero-sequence currents of non-fault lines; 2 dividing the transient-state zero-sequence currents of all of lines according to a certain time period, performing subsection phase plane transformation to obtain Euclidean distances from all of phase points of the transient-state zero-sequence current of each section to determinacy points x and y on a phase plane so as to extract local features of the transient-state zero-sequence currents of all of subsections and obtain feature matrixes of global features of all of lines; 3 performing normalization processing on elements in the feature matrixes to improve comparability; 4 utilizing a fuzzy K-means clustering method to perform clustering on the normalized feature matrixes, dividing the transient-state zero-sequence currents of all of lines into two categories and the lines independently included in one category are fault line. The method improves the automation degree and line selection margin.

The invention relates to a parameter re-calibration method for a structured light three-dimensional measurement system, and equipment; and an auxiliary camera is added in a system with a camera and a projector to realize re calibration on a parameter inside the projector. A high-precision white flat plate is arranged; the projector projects a structured light pattern; and the original system camera and the auxiliary camera collect a white flat plate pattern. The two cameras are calibrated to obtain the parameter of the auxiliary camera; on the basis of a stereoscopic vision principle, a white flat plate is reconstructed by using a shot picture; a reconstructed point cloud is projected to an emission phase plane of the projector in a back projection mode, a corresponding projection phase is calculated, and a difference between the calculated projection phase and an actual phase to obtain a phase residual difference value; and then on the basis of a principle of least squares, calculation is carried out to obtain error values of a transverse equivalent focal distance and a lateral optical center of the projector, thereby completing re calibration of the parameter inside the projector. Therefore, the calibration accuracy of the structured light three-dimensional measurement system is improved.

A phase plane correlation motion vector determination method identifies images areas in which motion took place. A reference image is shifted by the candidate motion vectors obtained from the phase plane correlation. The shifted reference image is correlated to determine similarity with the current image and to eliminate spurious motion vectors. Candidate motion vectors are validated to determine valid motion vectors and identify problem areas. In a preferred embodiment, a correlation resolution is set to a sub-block size. Sub-blocks of the reference image are shifted by candidate motion vectors for corresponding blocks. Shifted sub-blocks are correlated with sub-blocks of a current image using a sub-block neighborhood to determine valid vector assignments. Where an assignment proves invalid, global motion parameters are determined to assign motion vectors to sub-blocks where correlation fails.

A stream of data may flow over a fiber or other medium without any accompanying clock signal. The receiving device may then be required to process this data synchronously. Embodiments describe clock and data recovery (CDR) circuits which may sample a data signal at a plurality of sampling points to partition a clock cycle into four phase regions P1, P2, P3, and P4 which may be represented on a phase plane being divided into four quadrants. A relative phase between a data signal transition edge and a clock phase may be represented by a phasor on the phase plane. The clock phase and frequency may be adjusted by determining the instantaneous location of the phasor and the direction of phasor rotation in the phase plane.

The invention belongs to the field of satellite communication, and particularly relates to a method for analyzing mutual interference between satellite communication systems. According to the method provided by the invention, the relationship between a phase track line and an interference protection area drawn on a phase plane is analyzed to analyze the mutual interference between different satellite communication systems and determine a time and a phase angle exceeding the interference protection standard. The analysis method provided by the invention is suitable for analyzing the mutual interference between multiple satellite communication systems, an orbit position change rule is reflected in phase angle change, so that the number of intermediate variables is reduced, and the method is more intuitive and effective.

The invention relates to a dynamic testing device and method for the ablation rate of a material. The dynamic testing device comprises a CCD (Charge Coupled Device) camera, wherein a light filter group is mounted in front of a multi-focal-length camera lens and is used for blocking highlight emitted from a test piece and simultaneously allowing the transmission of lasers for demarcating a position; the position is demarcated by the positioning cross-shaped lasers; an electric arc heating spray gun is utilized to heat the end face of a to-be-tested ablative material; the whole device is positioned by a positioning bracket to enable the electric arc heating spray gun and the to-be-tested ablative material to be located on the same axis, and the point of intersection of the positioning cross-shaped lasers is throughout maintained on the center of the end face during a backward movement process of the end face; the CCD camera and the to-be-tested ablative material are located in the same horizontal position, a phase plane of the CCD camera is parallel with the axis of the to-be-tested ablative material, and the CCD camera is connected with a computer and is used for collecting and storing test images. According to the dynamic testing device, the dynamic ablation quantity test experiment of materials, such as graphite and vycor, can be implemented under an electric arc heating condition; the dynamic testing device has the advantages that the experiment cost is low, and that the experiment temperature is easy to control.

A received signal obtained from an antenna is subjected to high-frequency amplification. The amplified signal is supplied to a first bandpass filter, which extracts only signals of all the channels of a communications system concerned while filtering out other radio signals. The extracted signals are frequency-converted by using a local oscillation frequency, and only a desired wave is passed by a second bandpass filter. The desired wave is supplied to a sample-and-hold circuit, which performs sampling according to the bandwidth-limiting sampling theorem. A resulting discrete signal is supplied to an I-axis-component and Q-axis-component separating circuits, where the polarity of sample values is inverted for every other clock pulse with respect to each of the I and Q axes to thereby effect Hilbert transform. Resulting two orthogonal components on a phase plane are supplied to a complex coefficient filter.

The invention discloses an implementing method for front vehicle following. The implementing method comprises the following steps of expressing following characteristics of vehicle distance control on a phase plane plot, wherein the transverse axis is the relative distance R of the two vehicles, and the vertical axis is the relative speed V of the two vehicles; adopting a straight line and curve combining method to determine an ideal target following characteristic curve in the phase plane plot; setting an ideal working point and a relatively ideal working point on the phase plane plot; adjusting the relative distance of the two vehicles in the front vehicle following way to approximate to the amplitude Ra; in the initial phase when the Ra is not reached, adopting the fixed acceleration and deceleration to approximate to the vehicle distance of the ideal working point; in the adjusting phase after the Ra is reached, reducing an accelerator or braking to reach the ideal working point, wherein the ideal working point is that the relative speed of the two vehicles is zero and the relative distance of the two vehicles is the ideal and safe vehicle distance set by a driver. The implementing method for the front vehicle following is applied into a vehicle cruising control system, so the comfortability and safety of the vehicle cruising control system are improved, and the easiness in accepting by the driver is realized.

A phase plate (10) for phase-contrast electron microscopes is characterized by comprising a conductive core phase plate (14) which has a phase plate body (11) and a phase plate support (12) supporting it and is arranged in the path of electrons having passed through the objective lens of an electron microscope and in which the phase plate body (11) is so supported on the phase plate support (12) having an opening (13) as to cover at least a part of the opening (13) and a conductive shield thin film (15) covering the periphery of the core phase plate (14) including the upper and lower sides thereof. Consequently, a phase plane for phase-contrast electron microscopes preventing the lens effect incident to charging completely and applicable to the field of material science, its manufacturing method and a phase-contrast electron microscope can be provided.

The invention relates to a rendezvous and docking six-degree-of-freedom relative control method. Firstly, dynamics modeling is performed on relative horizontal moving and relative rotation moving and then, the PI control law is adopted for designing an approaching direction (X direction) relative speed keeping controller and the PD control law is adopted for designing a horizontal position (Y / Z direction) keeping controller; the PID control law is adopted for designing a relative posture controller; a novel pulse width modulation method is provided for modulating an obtained continuous control amount to obtain an executing impulse width of a thruster; finally, a relative state controller design strategy set based on the PID control law is formed and a complete controller parameter selection design scheme is provided. According to the rendezvous and docking six-degree-of-freedom relative control method, the defect that when a phase plane control algorithm is adopted in the prior art, influences on the design of the controllers by disturbance factors such as flexural vibration are hard to analyze is overcome. Meanwhile, the defect that accurate relative speed tracking control is hard to perform in phase plane control is overcome and the high-precision rendezvous and docking relative state control is achieved.

A video codec of a preferred embodiment is suitable for implementation on a variety of platforms, including platforms where devices require both encoding and decoding engines. Various features of preferred embodiment codecs reduce complexity for operations such as motion determination. Channel resources are allocated in preferred embodiments unequally, with an allocation being determined based upon channel conditions and the error level in a frame being encoded. A decoder of a preferred embodiment, provided with an error frame and motion vector information may conduct decoding with motion compensation. In an example encoder of the invention, a motion estimator identifies motion vectors using a phase plane correlation technique based on phase quantization, where the phase difference between the Fourier transformed version of blocks in a reference frame and a current frame is estimated by dividing the complex plane into sectors and assigning the Fourier domain difference to the sectors.

Methods and apparatus for wired communications are disclosed. A method for transmitting a data stream through a wired communications channel includes encoding the data stream to produce a first baseband modulating signal I(t) and a second baseband modulating signal Q(t) whose amplitudes together represent a time series of complex symbols (I, Q) each selected from a two-dimensional (2-D) constellation of symbols distributed on the phase plane about the origin such that at least one of the baseband modulating signals has a substantially non-zero mean amplitude, modulating the baseband signals I(t) and Q(t) to produce a modulated signal, wherein the I(t) and Q(t) components of the modulated signals are generally fixed in quadrature, and providing the modulated signal to a wired communications channel.

The invention discloses a distributed electric vehicle yaw stability control method and system. The distributed electric vehicle yaw stability control method includes the steps that a road surface adhesion coefficient of the road surface on which a vehicle is and the state data of the vehicle at current time are obtained; a centroid inclined angle-centroid inclined angle velocity phase plane diagram corresponding to the road surface on which the vehicle is is determined based on the road adhesion coefficient; a maximum stable area and a minimum stable area of the phase plane diagram are determined; and the positions of phase trajectory points of the vehicle in the phase plane diagram in a current state are determined; a centroid inclined angle weight coefficient is determined according to the positions; the expected yaw angular velocity and expected centroid inclined angle of the vehicle are calculated; a sliding mode surface switching function is established; according to the state data, the centroid inclined angle weight coefficient, the expected yaw angular acceleration and the expected centroid inclined angle velocity and the sliding mode surface switching function, a desired additional yaw moment is calculated; and the steering of the vehicle at the current moment is controlled based on the expected additional yaw moment. According to the distributed electric vehicle yaw stability control method and system, the stability degree of the vehicle can be accurately judged, and the steady-state steering of the electric vehicle is realized.

A transmitting apparatus comprising circuitry operable to generate a plurality of bit sequences using bits included in a first data block and a second data block, circuitry operable to control the plurality of bit sequences to correspond to a signal point on the phase plane, comprising a bit sequence generating unit operable to control the generation of the bit sequences to adjust an occupation rate occupied with predetermined bits included in the first data block to be closer to an occupation rate occupied with predetermined bits included in the second data block in regard to bit positions of the predetermined bits, based on an error tolerance of the respective bit sequences generated resulting from the correspondence to a signal point on the phase plane, and circuitry operable to transmit the signals obtained by multi-level modulations in accordance with each signal point.

The invention discloses a phase plane vehicle stability determination method. The phase plane vehicle stability determination method comprises steps of establishing a two-freedom-degree vehicle analysis model according to a driving condition input parameters, using a vehicle two-freedom-degree model to draw a whole working condition vehicle stability phase plane graph, wherein the phase plane graph is a vehicle-side-slip-angle-and-yaw-velocity phase plane graph with the yaw velocity as an ordinate and the side slip angle as an abscissa, 2) determining a type of a stability domain where the vehicle is positioned according to the working condition of the vehicle, 3) using a stability domain type database to obtain a vehicle stability domain according to the vehicle working condition and 4) determining whether the vehicle is unstable through determining whether the vehicle driving state is beyond the stability domain. The phase plane vehicle stability determination method can fully characterize a stability state of a full working condition vehicle and provides an accurate determination basis to involvement and exit of the vehicle stability control.

Systems and methods for converting a picture frame rate from a source video at a first rate to a target video at a second rate via interpolation of an intermediate frame. In one implementation, the system includes a phase plane correlation calculator including a low pass filter and a high pass filter for receiving previous frame data and current frame data where the phase plane correlation calculator is configured to generate a first motion vector based upon low pass representations and high pass representations. The system may also include a motion compensated interpolator that receives the first motion vector and an additional input motion vector and determines a final motion vector for use in interpolation. The system may further include an intermediate frame generator configured to generate the intermediate frame utilizing the final motion vector.

The invention discloses a double-channel anti-vibration interference measuring device and a method thereof. The device comprises a light source beam expanding and collimating system which is used forperforming beam expanding and collimating on the light source, an auxiliary interference measuring system for detecting the vibration phase plane of the measured piece, a main interference measurementsystem for measuring the phase distribution of the measured piece by combining with an auxiliary interference measurement system, and an optical path system of the measured piece, which are arrangedin sequence. The light source beam expanding and collimating system and the optical path system of the measured piece have the same optical axis, which is marked as the first optical axis, and the optical axes of the auxiliary interference measurement system and the main interference measurement system are respectively marked as the second optical axis and the third optical axis which are verticalto the first optical axis; the light source beam expanding and collimating system, the main interference measurement system and the optical path system of the measured piece form a main Twyman-Greeninterference light path; and the light source beam expanding and collimating system, the auxiliary interference measurement system and the optical path system of the measured piece form an auxiliary Twyman-Green interference optical path. The device and the method have the advantages of good vibration resistance effect, high measurement precision, simple and compact structure and lower cost.

The invention relates to a weak periodic signal detecting method based on a phase-locked loop and a Duffing oscillator, and belongs to the field of signal processing. According to the method, the phase-locked loop and the Duffing oscillator are used for setting up a combined weak signal detecting system; signal frequency is detected through the phase-locked loop to detect weak periodic signals with unknown frequency; according to the curve characters of a time history of chaotic signals, and a sequence diagram method and a phase plane diagram method are matched to serve as the criterion for detecting a system state and detecting whether the system state changes or not; a precise threshold value at which the system jumps into a periodic state from a chaotic state is obtained, and the threshold and quality for detecting the weak periodic signal are improved. Compared with a traditional method, the weak periodic signal detecting method can detect the signals with the unknown frequency, is easier to implement, saves a lot of simulation time, is of great signification in practical application and thereby has very good application prospects.

The invention discloses a wireless power transfer system sliding-mode control method based on a Buck link, the method comprising the following steps of S1, determining the optimal switching point andthe steady state point on a uC1-iL phase plane by using the output capacitor voltage uC1 and the freewheeling inductor current iL of the Buck link as detection objects; S2, determining the slope of asliding-mode line and the longitudinal-axis intercept according to the optimal switching point and the steady state point; S3, determining whether current limiting control is needed, and if so, adjusting the slope of the sliding-mode line; S4, determining whether load switching occurs, and if so, adjusting the longitudinal-axis intercept of the sliding-mode line; S5, obtaining the output capacitorvoltage uC1 and freewheeling inductor current iL in real time, and controlling the state of a switch tube in a Buck circuit according to the sliding-mode control strategy. The method can accelerate the dynamic response, shortens a dynamic process, limits the current overshoot by changing the slope of the sliding-mode equation, quickly restores the output voltage of the secondary side to an original state during load switching, and improves the robustness and adaptability of the control.

The invention discloses an orbital angular momentum (OAM) multiplexing transmission system based on phase surface relaying. The OAM multiplexing transmission system comprises a signal transmitting end, a signal receiving end and a central receiver, wherein the signal transmitting end is used for collecting user data, modulating the user data into OAM electromagnetic waves of a plurality of modes,and transmitting the OAM electromagnetic waves to the signal receiving end; the signal receiving end comprises a plurality of relay repeaters which are distributed on a circular ring covered by a mainlobe; each relay repeater forwards received signals at different locations on a phase plane circular ring; the relay repeaters are independent of each other, and the number of the relay repeaters isno less than the mode number of the OAM electromagnetic waves; the signals are forwarded to the central receiver in a wireless or wired way; the central receiver comprises a second receiving and transmitting antenna for receiving the signals relayed and forwarded by the plurality of relay repeaters, a phase plane correction module for carrying on phase plane correction on the distributed transmitted signals, and a demodulation module for demodulating the signals being subjected to phase plane correction. By adopting the system, electromagnetic wave orbital angular momentum transmission of longdistance, high capacity and high spectral efficiency can be realized.

The invention discloses a method for accurately positioning bridge cranes and planning tracks in an online manner on the basis of phase plane analysis. The 32t bridge cranes can be automatically controlled by the aid of the method, and the method is excellent in positioning and anti-swing performance. The method includes simplifying system dynamics models and providing principles of phase plane processes; testing running characteristics of the industrial cranes in fields, analyzing the running characteristics and providing a process for planning the tracks in an online manner according to the running characteristics. The method has the advantages that track planning parameters are adjusted on an online manner by the aid of data of laser range finders in crane running procedures, grade braking schemes are adopted, theoretical analysis is carried out by the aid of analysis processes on the basis of phase planes, and system swing angles are proved to be close to zero when the bridge cranes reach target locations; the method is applied to automatic control systems of the 32t bridge cranes, excellent control effects can be realized, and accordingly the method has excellent practical application value.

The invention provides a method for controlling the liquid level of a four-hold water tank based on phase plane method. The invention has the main characteristics that the liquid levels of two water tanks which are positioned at the lower layer are respectively controlled by adopting two independent controllers. A phase plane partition control method is used as a control strategy. The method provided by the invention can directly calculate controlled quantity adapted to current ERROR and CHANGE IN ERROR according to the current ERROR and CHANGE IN ERROR without modeling for a system, has a stronger anti-interference performance and is suitable for controlling a coupling system. Aiming at the problem of time lag of a multi-hold water tank, the overshoot caused by the time lag can be restrained through adding the derivation feedback; and by organically combining the time lag and the derivation feedback, finally, a set value can be quickly and stably tracked by the liquid level.

The invention provides a stumpage breast height diameter measuring method based on an optics similar triangle method. The stumpage breast height diameter measuring method based on the optics similar triangle method relates to forest measurement and includes the following steps: a camera and a laser are used to create a stumpage breast height diameter measuring system; the camera is used to take photos of a to-be-tested stumpage to obtain images of the stumpage; and after the shot images of the stumpage are preprocessed, a point, namely a laser spots falling on a phase plane, (X', Y') is obtained. According to an optics similar triangle principle, the point (X', Y' ) that the laser spot falls on the phase plane carries out coordinate transformation towards a three-dimensional space to obtain a point (X, Y, Z). The point (X, Y, Z) projects towards a horizontal direction to obtain a point (X projection, Y projection) after being processed. A least square circle fitting method is adopted to carry out circle fitting on the point(X projection, Y projection), and then a round radius parameter after fitting is a breast height diameter of the to-be-tested stumpage. The stumpage breast height diameter measuring method based on the optics similar triangle method has the advantages that algorithm can be realized easily and can measure the stumpage breast height diameter quickly in non-contact mode.