210 results about "Vector angle" patented technology

A device adapted to attach to a subject for detecting an ECG signal of the subject. The device includes a first, a second, and a third electrode, where the electrodes form an orthogonal configuration. Two channels of ECG data can be obtained using a common electrode, and can be further combined to obtain a further channel using vector mathematics. The channel combination can be performed at vector angles suitable for optimizing the detection of various features of the ECG spectra of the subject. A method of using an implantable cardiac device together with surface-attached wireless sensor(s) is also provided where the acquired data from the implantable cardiac device and from the surface-attached wireless sensor(s) are both used for diagnosing patient's heart conditions and administering appropriate therapies.

The invention discloses a human body motion recognition method based on three-dimensional bone information. The method comprises the steps that color data stream, depth data stream and bone data stream of a number of individual samples of different sex and height are processed, wherein the individual samples make various motions; SVM models corresponding to all motions are constructed; the bone data stream of a recognized target which makes any motion within the acquisition range of a Kinect depth sensor is acquired; through the bone data stream, the distance between a normalized human body bone articulation point and a reference point and 14 vector angles are acquired; the data are respectively input to multiple SVM models; and a motion corresponding to the SVM model with the highest output probability is the motion of a recognition target. According to the invention, the Kinect depth sensor is used to acquire images; the method is less affected by light condition, shadow and other factors; the depth map and the bone information of a human body motion are acquired in real time; and a human body target in a scene can be accurately located.

A jet engine nozzle having a pair of pivoting extension arms and a pair of pivoting shells connected to a jet pipe is provided. The first extension arm is pivotally connected to the jet pipe at a first location, while the second extension arm is pivotally connected to the jet pipe at a second location. Each shell is pivotally connected at both the first and second locations. An axis of rotation associated with the first location is coaxial to an axis of rotation associated with the second location. Independent actuation means are provided to rotate the extension arms and the shells, thereby enabling adjustment of the thrust-vector angle or the exhaust area of the nozzle.

A computer (15) captures the colored moving image of the golfer (11) who swings by gripping a golf club (12) having colored marks (M1 through M3) attached to a shaft (12a) thereof. The computer (15) converts the colored moving image into a plurality of still images; executes binarization for each pixel of a plurality of the still images by using a specific threshold of color information and recognizes pixels, of the still images, which satisfy the threshold as positions of the colored marks (M1 through M3) and extracts a movement of the shaft (12a) by using a movement vector amount of one of the colored marks (M1 through M3 ) or by using a vector angle between two of the colored marks (M1 through M3). In this manner, the computer (15) automatically extracts check-point images.

The invention relates to a capacitance current feedforward control method for a grid-connected inverter with an LCL filter and belongs to the field of electric energy conversion. The capacitance current feedforward control method for the grid-connected inverter with the LCL filter solves the problem of low stability of the grid-connected inverter with the LCL filter in the prior art and the problem of reduced efficiency of a system due to phase difference between grid side voltage and current. The method comprises the following steps of: 1, acquiring three-phase power grid voltage and acquiring a vector angle theta of the power grid voltage; 2, acquiring three-phase output current of the inverter and acquiring direct current components ild and ilq of the inverter side current; 3, acquiring three-phase filter capacitance current and acquiring direct current components icd and icq of the filter capacitance current; 4, setting set values of the inverter output current to perform proportional integral (PI) adjustment on a processed signal, outputting uq, performing PI adjustment on the processed signal, and output ud; and 5, inversely converting the ud and the uq into u(alpha) and u(beta) and performing pulse width modulation on the u(alpha) and the u(beta) to acquire six paths of switching signals which are used for controlling six switching tubes of the three-phase inverter so as to perform capacitance current feedforward control on the grid-connected inverter.

The invention relates to a method for cutter-axis vector fairing of complex curved surface five-axis numerical control machining based on kinematical constraints, which belongs to the field of precise and efficient processing of complex curved surface five-axis numerical control machining, and particularly relates to a method for cutter-axis vector fairing based on machine tool kinematical constraints in the process of complex curved surface five-axis numerical control machining. The method is characterized by establishing a machining tool swivel feeding shaft angle optimized mathematical model on the basis of determining a cutter-axis fairing adjustment interval on a processing track curve and determining a discrete point according to the cutter step length, carrying out optimization on the corresponding machining tool swivel feeding shaft angle of the discrete point, and determining a corresponding coordination calculation method of a cutter-axis vector; then calculating the rotation angle of the cutter-axis vector opposite to the curved surface normal vector corresponding to the discrete point; and finally, carrying out fitting on the acquired discrete processing track normal vector angle, thereby acquiring a cutter-axis vector function for fairing, and ensuring a rotation axis of a machine tool to be smooth in motion. The method provided by the invention realizes smooth motion of the rotation axis of a five-axis numerical control machine tool, is wide in application range, and effectively improves the processing quality of the complex curved surface.

A process for balancing a vehicular driveline including a propeller shaft and an input shaft of a vehicle axle interconnected by a universal joint. First, the vehicle propeller shaft is balanced to a predetermined residual imbalance having an imbalance vector angle of 0° or 180° which lies inline with open set of cardan joint trunnions. The corrected residual imbalance is then visually marked. Next, the input shaft is balanced to a predetermined residual imbalance having an imbalance vector angle of 0° or 180° which lies inline with cross-holes in yoke ears. Again, the corrected residual imbalance on the input shaft is then visually marked. During the assembly of the vehicle, the assembly line operator couples the propeller shaft to the input shaft through a cardan joint cross by aligning the marks on the propeller shaft and the input shaft so that the marks are located opposite to each other.

The invention relates to an optical flow characteristic vector mode value and angle combination micro expression detection method based on an interested area. According to the method, firstly, a micro expression video is pre-processed to acquire a micro expression sequence, key face characteristic points are further extracted, and a face interested area having the best effect is found out according to motion characteristics of different expression FACS motion units; optical flow characteristics of the interested area are extracted. The optical flow vector angle information is firstly introduced, an optical flow vector mode value and the angle information are acquired through calculation, through combination of the two, a more comprehensive and more judicious characteristic detection micro expression segment can be acquired; the optical flow mode value and the angle information are combined, the threshold is determined according to magnitude of the optical flow mode value, and a number shape combination method is utilized to vividly and visually acquire the micro expression segment. The method is advantaged in that micro expression detection efficiency is substantially improved, optical flow characteristic vector extraction is carried out only in the key face area, computational complexity is reduced, the consumption time is shortened, and high robustness is realized.

A grater and method for grating, wherein a grating panel is connected to a handle with a gripping portion aligned behind the grating surface back side below the top end and above the bottom end and in a common plane with the directional vector, the gripping portion further forming an angle with the downward directional vector, the gripping portion vector angle less than 90 degrees. It is preferred that the angle is selected to translate forces normal to and against the grating surface front side into compressive forces against a user's hand gripping the handle gripping portion. In one embodiment, the connecting means is a steel rod disposed along the panel edge portions and projects from the panel top normal to the planar panel. Some embodiments have stand elements to enable the grater to stand upon a work-surface.

The present invention relates to a wood composite panel having a major planar portion, at least one panel portion, and an inwardly extending contoured portion surrounding the panel portion and interconnecting the major planar portion and the panel portion. The contoured portion defines an inter-relationship between a vector angle and a deep draw depth that achieve a satisfactory stretch factor. The present invention also relates to a door having the disclosed wood composite door facings, and methods of forming the facing and door.

The invention discloses a control method of a maximum torque per ampere vector control system for a position sensor-free internal permanent magnet synchronous motor, and belongs to the field of motor control. The problems of complexity of a computing method and low accuracy of an obtained current set value in the conventional maximum torque per ampere control strategy are solved. The control system comprises a permanent magnet synchronous motor, an inverter, a space vector pulse width modulation unit, a three-phase-two-phase coordinate conversion unit, a static-rotational coordinate conversion unit, a Fourier analysis unit, a vector angle regulation unit, a rotating speed regulator, a maximum torque per ampere control unit, a first current regulator, a second current regulator, a rotational-static coordinate conversion unit and a rotor position and rotating speed observer. According to the control method, the magnitude of current amplitude is automatically regulated and compared on the basis of a current vector angle gamma, and an operating point with maximum torque per ampere is automatically searched. The system and the method are applied to maximum torque per ampere vector control over the motor.

The invention discloses a PMSM rotary transformer zero position initial angle calibration method and calibration system. The PMSM rotary transformer zero position initial angle calibration method comprises steps of connecting an PMSM, on which a rotary transformer is installed, to a driving motor, enabling a motor stator of the PMSM to perform three-phase short circuit, using the driving motor to drive the PMSM to rotate forward and maintain at a preset rotation speed, using an electronic control unit to perform sampling on three phase current Ia, Ib and I c and a rotary transformer reading phi read at a same moment, using the rotary transformer reading phi read to perform Park conversion on three phase current Ia, Ib and Ic to obtain current vectors Is,p, calculating a vector angle theta p corresponding the current vector Is,p, using the driving motor to drive the PMSM to rotate backwards and maintaining the rotation at a preset rotation speed, using the electronic control unit to record a vector angle theta n corresponding to a current vector Is,n when the motor is rotated backwards, and calculating that a practical electric rotation angle theta 0 corresponding to the rotary transformer reading zero point angle is a zero position initial angle according to a formula theta 0=(thetap+thetan) / 2-180 degree.

The invention discloses a light beam position and polarization angle common light path detection device and method based on a photoelectric position sensor. The method comprises the following steps: utilizing a lateral excursion and polarization dispersion prism to shape an incident light beam, outputting orthogonal parallel polarized lights with proportionable light intensities and realizing the contactless space position attitude transfer function; enabling a receiving system to utilize a rotary motor with a coder to drive an analyzer to detect the beacon light polarization through rotation at a constant angular velocity, utilizing the horizontal photoelectric effect of a PSD (Phase-sensitive Detector) to measure the light spot imaging position of beacon light and reversely pushing a beacon light beam position coordinate according to the imaging principle; utilizing light current generated by gathering incident light intensities on the surface of the PSD to detect the incident light intensities, comparing with an angle instantaneously fed back by the rotary motor, obtaining the synchronous polarization angle information of a beacon light beam after the phase sensitive detection, and achieving the function of simultaneously adjusting and detecting the beacon light track and the base vector angle on a same light path and a device. The light beam position and polarization angle common light path detection device has the benefits of simple structure and simple components and is suitable for the multi-dimensional angle measurement demands.

The invention relates to the technical field of surface defect detection, and provides a high-speed rail heavy rail surface defect detection method based on a point cloud method, which comprises the following steps of firstly, constructing a detection platform, and calibrating a color binocular linear array camera; collecting the initial linear array images of the to-be-detected high-speed rail heavy rail under n visual angles and preprocessing the initial linear array images; mapping the two two-dimensional images under each view angle into a three-dimensional depth image, utilizing a two-dimensional image registration method based on phase correlation to provide the initial registration for two to-be-registered point clouds under adjacent view angles, and performing ICP accurate iteration on each pair of point clouds after registration to obtain the complete surface point clouds; and finally, carrying out defect extraction and segmentation on the complete surface point cloud by utilizing a point cloud region growth algorithm taking the normal vector angle and the curvature change quantity as smooth thresholds to obtain the surface defect distribution of the high-speed rail heavyrail to be detected. According to the present invention, the influence of the image acquisition quality and the detection area range on detection can be reduced, the detection efficiency and the detection rate are improved, and the missed detection rate and the false detection rate are reduced.

A magnetic field sensor for detecting motion of an object includes magnetic field sensing elements to generate at least two phase-separated magnetic field signals and a processor including a vector angle generator to generate vector angle values as a function of the magnetic field signals and a vector angle comparator to generate a comparator output signal indicative of a difference between a plurality of vector angle values. An output signal generator responsive to the comparator output signal is configured to generate a sensor output signal indicative of a one or more conditions of motion of the object including: an absence of normal rotation, a direction change, and a vibration. In some embodiments, the vector angle comparator may generate a comparator output signal indicative of a comparison of a vector angle value and one or more threshold values. In this case, the output signal generator may be configured to generate a sensor output signal indicative of a speed of motion and / or a position of the object.

The present invention reveals a method and apparatus for controlling the effective area and thrust vector angle of a fluid flow. In one embodiment, the fluid flow is controlled in an advanced, high aspect ratio, complex aperture geometry nozzle using asymmetric injection into the subsonic portion of the fluid flow. The present invention vectors the primary flow by partially blocking the flow with an opposed flow across the flow field. A fluidic flow field is defined in a flow container that directs a pressurized, primary fluidic flow from the container towards an exit of the container. A nozzle may cooperate with the exit of the flow container to control the fluidic flow as it exits the flow container. One or more injectors associated with the container are proximate to the effect throat of the primary flow while other are located downstream of to introduce an opposing fluidic flow that interacts with the primary fluidic flow. A controller associated with the injectors directs the injectors to provide the opposing flow as needed to achieve a desired partial blockage of the primary flow, thereby vectoring the primary flow.

The present invention relates to a wood composite panel having a major planar portion, at least one panel portion, and an inwardly extending contoured portion surrounding the panel portion and interconnecting the major planar portion and the panel portion. The contoured portion defines an inter-relationship between a vector angle and a deep draw depth that achieve a satisfactory stretch factor. The present invention also relates to a door having the disclosed wood composite door facings, and methods of forming the facing and door.

A method for estimating a 3D vector angle from a 2D face image, a method for creating a face replacement database and a method for replacing a face image includes steps of capturing a face image, detecting a rotation angle of the face image, defining a region to be replaced in the face image, creating a face database for storing replaced images corresponding to the region to be replaced, and pasting one of the replaced images having the corresponding rotation angle of the face image into a target replacing region. Therefore, the region to be replaced of a static or dynamic face image can be replaced by a replaced image quickly by a single camera without requiring a manual setting of the feature points of a target image. These methods support face replacement at different angles and compensate the color difference to provide a natural look of the replaced image.

An eyeglass lens processing apparatus for processing a periphery of an eyeglass lens, includes: a lens rotation shaft which holds and rotates the lens, the shaft being rotatable about a first axis; a grooving grinding stone which forms a groove in an edge surface of the lens; a holder which rotatably holds the grooving grinding stone; an inclination mechanism for relatively inclining the holder with respect to the lens rotation shaft to change inclination of a rotation axis of the grooving grinding stone with respect to the first axis; and a controller for obtaining desired inclination of the rotation axis of the grooving grinding stone correspondingly to a radius vector angle at each processing point of grooving locus, thereby controlling the inclination by the inclination mechanism.

A high spectroscopic data supervision classification method based on information quantity dimensionality sequence includes the following steps: reading the high spectrum image data of a certain region; selecting a reference spectrum from the spectrum library or selecting the training sample from images to execute wave band average acquiring reference spectrum; calculating one by one the reference spectrum and all test spectral information quantity dimensionality sequence; executing vector angle matching one by one the test spectrum with all reference spectral information quantity dimensionality sequence, and using minimum distance classification machine to classify; result binarization matching, the matching result of each series of field culture is represented by the binary images, each image only includes a series of field culture. The high spectroscopic data classification method based on information quantity dimensionality sequence introduces the information quantity dimensionality into the spectrum domain analysis, synthetizes the advantages of the all band matching and partial quantization characteristic matching, can obtain higher classification effectiveness and classification accuracy, and has important value in the high spectroscopic data classification and object identification.

The invention aims to provide a slope stability detection and pre-warning method on the basis of simultaneous monitoring of horizontal displacement and vertical displacement of a slope crest of a foundation pit. The method includes the steps: selection of foundation pit excavation slope displacement monitoring points and datum points; arrangement and installation of displacement monitoring equipment; real-time monitoring of foundation pit excavation slope surface displacement and real-time processing of monitoring data; determination of foundation pit excavation slope vertical displacement vector angle parameters and sequence thereof; determination of pre-warning criterions for stability of the foundation pit excavation slope vertical displacement vector angle parameters; evaluation on dynamic stability of foundation pit excavation slopes and monitoring and pre-warning of instability. By coupling of horizontal displacement and vertical displacement of the foundation pit excavation slopes, an included angle formed by a foundation pit excavation slope surface displacement vector and the horizontal plane is defined as a vertical displacement vector angle, and evaluation and real-time monitoring and predication of dynamic stability of the foundation pit excavation slopes and pre-warning of instability are realized.

The invention provides a numerical control system-based tool radius compensation vector calculating method which comprises the steps of: judging different switching-over types through analyzing the distribution condition of a vector angle of a tangent line on the switching-over point of a processing segment on a plane coordinate system, and calculating the coordinate point after cutter compensation according to a specific computing method; analyzing the processing segment according to the information of the tool radius, the cutter compensation direction and a workpiece outline coordinate point and the like after collecting and processing the information of a to-be-processed workpiece, calculating vectors of two tangent lines on the switching-over point, and obtaining a switching-over angle of two straight lines according to the vectors of the two tangent lines, drawing the distribution condition of the switching-over angle in the plane coordinate system, and judging the switching-over type of the two straight lines so as to figure out coordinates of the switching-over point by adopting a vector calculating method; and sending information of the coordinates to a numerical control system for next step of interpolation. The numerical control system-based tool radius compensation vector calculating method has the advantages of being simple in calculating method and small in calculating quantity, and being beneficial to the realization of programming especially for the calculation of the switching-over point, thereby increasing the processing efficiency.

The invention discloses a method for starting a motor without a position sensor, which includes: applying a fixed voltage vector to the motor and obtaining Is; subjecting the Is to Clark conversion and obtaining i <alpha> and i <beta>; presetting rotation speed omega r and torque T<e> as 0 by computing to obtain rotor flux-linkage vector angle theta r, subjecting omega r and omega r to PI operation to obtain Te, then subjecting Te and the T3 to PI operation to obtain delta, obtaining theta<s> according to the formula theta <s>=theta <r> +delta, giving Psi* <s> to obtain U<alpha> and U<beta>, subjecting the U<alpha> and the U<beta> to inverse Clark conversion and obtaining U, U and U<c>, acquiring I, I and I<c> through current, subjecting the I, the I and the I<c> to Clark conversion and obtaining I alpha and I beta, obtaining Psi <s> alpha and Psi<s> beta by stator flux linkage operation, obtaining Psi<s> and theta<s> by modular angle operation, obtaining the Te by torque estimate, discretizing the theta<s> to obtain omega<r>, and finishing motor starting process if the omega<r> is equal to the omega*<r>. The method for starting the motor without the position sensor has the following advantages that by combining initial position detection technology with DTC (direct torque control) strategy, loop-locked stable control of the integral control strategy is realized.

The invention discloses an electrocardiosignal analysis method of a T wave alternans scatter diagram method based on morphology. Aiming at the defects of difficulty in detection of each heart beat T wave alternans amplitude value and complexity in calculation of T wave alternans detection by the spectrum analysis method, the T wave alternans scatter diagram method based on morphology is provided to provide a new effective quantitative index of T wave alternans detection for development of domestic related clinical researches. The method includes: using the T wave window analysis method for sampling T waves of 128 continuous heart beats selected from the American MIT-BIH standard heart beat irregularity database and the European ST-T electrocardio database, making a differential scatter diagram by the aid of the sample points, using vector angle index of the scatter diagram for quantitative analysis of T wave alternans to obtain a vector angle index range for judging whether T wave alternans exists or not, and comparing a T wave alternans detection result obtained by means of the vector angle index of the scatter diagram with the T wave alternans detection result obtained by means of the T wave alternans amplitude of the spectrum analysis method to judge reliability in detection of T wave alternans by the vector angle index.

A method for automatic video face replacement includes steps of capturing a face image, detecting a rotation angle of the face image, defining a region to be replaced in the face image, and pasting a region to be replaced of one of the replaced images having the corresponding rotation angle of the face image into a target replacing region. Therefore, the region to be replaced of a static or dynamic face image can be replaced by a replaced image quickly by a single camera without requiring a manual setting of the feature points of a target image. These methods support face replacement at different angles and compensate the color difference to provide a natural look of the replaced image.

The invention relates to a video jitter detection method based on inter-frame motion geometric smoothness, and belongs to the technical field of video processing. The method comprises the following steps: step 1, segmenting according to an inter-frame similarity degree; step 2, performing motion estimation on every segment by using characteristic point detection and matching; step 3, after that, calculating an average value and a variance of a translation of adjacent frames within the segments and an average value of a translation vector angle, and measuring the motion geometric smoothness through the three geometric quantities; and step 4, comparing the three geometric quantities with a preset threshold, and judging whether the segments jitter. Compared with an existing method, the video jitter detection method based on the inter-frame motion geometric smoothness provided by the invention uses the three geometric quantities relevant to the inter-frame translation vector to measure a jitter degree of one segment, and the calculation efficiency is fast and the accuracy is high.

A method for detecting pipeline defects based on three-dimensional data points acquired through circle structured light vision detection belongs to the field of nondestructive testing of defects of inner walls of pipelines. Section shapes and pipe wall appearances of the pipelines which serve as conveying means of common gases and liquid can greatly affect dynamic performances of flowing fluid. The method determines defects by utilizing structural features of three-dimensional data points acquired through a circle structured light vision detection system and using abrupt changes of a normal vector angle of two adjacent points on the same circle, and the determination method is simple and effective. The determination of pipeline defects is performed on the basis of three-dimensional data points acquired by the method instead of two-dimensional gray images, so that the accuracy rate and the precision are improved greatly.