57 results about "Transverse velocity" patented technology

The invention discloses a light stream based vehicle motion state estimating method which is applicable to estimating motion of vehicles running of flat bituminous pavement at low speed in the road traffic environment. The light stream based vehicle motion state estimating method includes mounting a high-precision overlook monocular video camera at the center of a rear axle of a vehicle, and acquiring video camera parameters by means of calibration algorithm; preprocessing acquired image sequence by histogram equalization so as to highlight angular point characteristics of the bituminous pavement, and reducing adverse affection caused by pavement conditions and light variation; detecting the angular point characteristics of the pavement in real time by adopting efficient Harris angular point detection algorithm; performing angular point matching tracking of a front frame and a rear frame according to the Lucas-Kanade light stream algorithm, further optimizing matched angular points by RANSAC (random sample consensus) algorithm and acquiring more accurate light stream information; and finally, restructuring real-time motion parameters of the vehicle such as longitudinal velocity, transverse velocity and side slip angle under a vehicle carrier coordinate system, and accordingly, realizing high-precision vehicle ground motion state estimation.

The invention relates to a multi-component converted wave static correction method by using surface waves, which comprises a step of solving stratigraphic classification and transverse wave velocity of a superficial layer through the extraction of the surface waves and the inversion of frequency dispersion curves based on Rayleigh surface waves in a shot record, so as to accurately calculate static correction quantity of detection points of converted waves. The test processing on two-dimensional three-component of a certain block in Daqing shows that a transverse velocity non-uniform body of the superficial layer generates a larger static correction time difference; and the processing on three-dimensional three-component data of a certain coal mine in Huainan shows that the static correction time difference of over 20 milliseconds can also occur due to the low and transversely non-uniform transverse wave velocity even in a flat plain terrain, and for a coalfield high-resolution seismic exploration to recognize minor faults of about 3 meters, the static correction time difference is a non-ignorable error. Application tests in three-component seismic data processing in two regions achieve a better processing effect and prove that the multi-component converted wave static correction method by using the surface waves is a feasible method.

Apparatus for high-volume, high speed ultrasonic cutting or slitting comprising a blade having first and second cutting edges suspended from a reciprocating head, cantilevered over a conveyor supporting and advancing the food product, with the blade including first and second cutting edges on respective opposite sides thereof to cut the food product transversely. The head is preferably controlled for automated operation by an electronic controller to reciprocate transversely at a selected speed and a selected frequency within predetermined ranges over food product advancing on the conveyor. The blade preferably oscillates ultrasonically, and preferably at a frequency of approximately 20,000 Hz. The first and second cutting edges are preferably downwardly convergent, defining an included angle greater than 60 degrees and less than 90 degrees. In one particular embodiment, the internal angle is 70 degrees. In another embodiment, the angle is about 60 degrees. The blade may have a linear translating velocity of 25 to 35 inches per second, and more specifically may have a transverse velocity of approximately thirty inches per second. The apparatus may be used in high-speed, high-volume commercial food production operations for automated cutting of cheese products and other food products from large chunks, slabs and the like into smaller portions, and may also be used in other applications.

The invention discloses an automobile direction intelligent control method based on a driver model. The method includes the steps of firstly, predicting a position where an automobile can reach after a moment T of a preview period according to the current running state of the automobile, comparing the position with a target position after the moment T, obtaining deviation of the two positions, obtaining the ratio of the deviation and T to serve as a predicted automobile transverse velocity, and then comparing the predicted automobile transverse velocity with an actual automobile transverse velocity to obtain a predicted automobile transverse velocity difference; secondly, obtaining a steering wheel turning angle through calculation, and controlling an automobile steering wheel according to the obtained steering wheel turning angle. The invention further discloses an automobile direction intelligent control system based on the drive model. The system comprises a preview module, a prediction module, a comparing module, a calculation module and a control module. Compared with the prior art, parameters of the driver model built in the method are directly obtained through parameters of the whole automobile, the driver module has the advantages of being simple in parameter and clear in physical meaning, and control of the automobile is more accurate and real.

An automated vehicle speed measurement and enforcement method and system. Traffic can be continuously monitored utilizing an image capturing unit and a controller. The speed of one or more vehicles within an effective field of view of the image capturing unit can be estimated. A burst of radiation from an associated remote sensing device can be triggered when a vehicle is detected having a speed greater than a predetermined value. An accurate speed of the vehicle can then be determined. Additionally, a transverse velocity component associated with the vehicle can be computed by the image capturing unit in order to thereafter apply the transverse velocity component to a reading generated by the remote sensing device to correct a cosine error with respect to the remote sensing device.

The invention discloses an abnormal formation pressure calculation method. The method includes: acquiring first effective stress through the relation between Young modulus and longitudinal and transverse wave velocity; acquiring second effective stress through the relation between bulk modulus and the longitudinal and transverse velocity; subjecting the first effective stress and the second effective stress to weighted average to acquire a final effective stress result; according to the final effective stress result, determining abnormal formation pressure sections by the aid of the effective stress theory. With the method, precision in predicting formation pressure is improved, influence of containing gas in the formation on formation velocity is eliminated, a high-precision model is established between the formation velocity and the effective stress, and an elastic modulus weighing method is developed to have the formation pressure predicated.

The invention discloses a cannonball trajectory correction method and device, a storage medium and an electronic device. The method comprises the following steps: acquiring operation information of a cannonball after the cannonball is out of a muzzle; according to the operation information, performing trajectory calculation on the cannonball to determine a predicted drop point position of the cannonball, comparing the predicted drop point position with a target drop point position, determining a deviation value, wherein the deviation value is used for indicating distance deviation and direction deviation between the predicted drop point position and the target drop point position; according to the deviation value and the roll angle position information, determining the ignition phase of a pulse engine on the cannonball and the ignition number of the pulse engine, and correcting the deviation value of the running track of the cannonball; collecting the transverse speed increment and the flight attack angle of the cannonball after the pulse engine is ignited, performing correction calculation according to the operation information in combination with the transverse speed increment and the flight attack angle so as to determine the correction result of the deviation value of the cannonball, and the problems that the correction accuracy of the trajectory is low, and the correction cost of the trajectory of the cannonball is high are solved.

A system for producing a charged particle beam from a photoionized cold atom beam. A vapor of neutral atoms is generated. From these atoms, an atom beam having axial and transverse velocity distributions controlled by the application of laser light is produced. The produced atom beam is spatially compressed along each transverse axis, thus reducing the cross-sectional area of the produced beam and reducing a velocity spread of the produced beam along directions transverse to the beam's direction of propagation. Laser light is directed onto at least a portion of the neutral atoms in the atom beam, thereby producing ions and electrons. An electric field is generated at the location of the produced ions and electrons, thereby producing a beam of ions traveling in a first direction and electrons traveling in substantially the opposite direction. A vacuum chamber contains the atom beam, the ion beam and the electron beam.

The present invention discloses a method, an apparatus and a system for eliminating the deposit of atoms on a Zeeman cooling window in a strontium atom optical clock. A strontium atom optical clock system is provided with, in a linear order along the direction of the atomic beam, an atomic pile which emits the atomic beam, a magneto-optical trap which confines the atoms and the Zeeman cooling window. In at least one area of the zones from an emission port of the atomic pile to the Zeeman cooling window, excluding the magneto-optical trap, the resonance light of to-be-removed atoms is used to irradiate the motion path of the atoms along a direction at an angle with the motion path of the strontium atom beam so that the atoms cannot reach the Zeeman cooling window. The present invention creates transverse velocity of the atoms through irradiation to prevent the atoms from reaching the Zeeman cooling window, effectively eliminating the deposit of the atoms on the glass of the Zeeman cooling window in an atomic optical clock system and maintaining the high transparency of the window glass.

The invention relates to a radar and method for measuring the transverse velocity of a moving object. The radar for measuring the transverse velocity of the moving object comprises a linear frequency-modulation pulse wave transmitting unit, a linear frequency-modulation pulse wave radio frequency front-end receiving unit, a signal processing unit, a control unit and a velocity display unit, wherein the control unit is connected with the linear frequency-modulation pulse wave transmitting unit, the linear frequency-modulation pulse wave radio frequency front-end receiving unit, the signal processing unit and the velocity display unit, and the linear frequency-modulation pulse wave radio frequency front-end receiving unit, the signal processing unit and the velocity display unit are connected in sequence. The radar for measuring the transverse velocity of the moving object is placed at a position a certain distance away from the moving object, two receiving circuits which are spaced from each other by a certain distance receive electromagnetic wave signals which are reflected back by the moving object, and the transverse velocity of the moving object is displayed through the display unit after processing such as mutual interference of the two paths of signals and velocity measurement is conducted. According to the radar and method for measuring the transverse velocity of the moving object, the moving object velocity detection performance, the moving object recognition performance and the moving object tracking performance of a radar system can be improved with respect to accuracy and real-time performance.

The invention discloses a method for measuring microwave radar beam central transverse velocity, which comprises the following steps of: selecting relatively prime pulse repetition frequency (repetition frequency for short) according to the distance unambiguity principle, and selecting the pulse accumulation number of each repetition frequency according to the requirements on the operating distance and the detected signal to noise ratio; transmitting a pulse signal, receiving a planet surface echo, detecting the distance gate number of the maximum power point, performing Doppler-related processing on the echo data of the distance gate, and solving an ambiguous beam central transverse velocity; and processing all pulses with repetition frequencies in turn, solving velocity ambiguity times according to the principle of the modified remainder theorem, and solving a real beam central transverse velocity by combining the ambiguous velocity result. The method for measuring the microwave radar beam central transverse velocity is only applied to a pulse radar system, can simultaneously measure the projection of horizontal and vertical two-dimensional velocity components in the beam direction, provides the distance measurement function, and has the characteristics of high measuring accuracy and simpler engineering implementation.

The invention provides a method for evaluating the hydroelastic instability of a planar tube bundle, which comprises the following two parts: modal analysis and Connors formula calculation. The modalanalysis part is responsible for calculating the natural frequency and the corresponding vibration mode of the heat exchanger tube. The Connors formula is used to calculate the equivalent velocity andcritical velocity in different modes according to the results of modal analysis. The invention has the following advantages: by utilizing the discrete characteristics of the finite element itself, the modal analysis and calculation of different fluid parameters outside the tube, non-uniform transverse velocity and complex heat exchange tube shape can be realized; based on the finite element modalanalysis results, the Gaussian integral method is used to calculate the Connors formula, and the weighted effect of vibration mode on the equivalent velocity is realized.

The invention provides a blood flow velocity imaging method based on a transverse velocity model. The method includes the steps that laser which is subjected to beam expansion is used for irradiating the body surface, and a CMOS camera is used for carrying out continuous imaging on irradiated areas; motion of red cells in shallow blood vessels of the body surface causes fluctuation of backscattering light intensity; an overall pixel matrix is used as a paralleled detector array, and each pixel in the CMOS camera is used as an independent detector; light intensity signals recorded by each pixel form an independent signal sequence, a normalized autocorrelation function of each signal sequence is calculated after continuous imaging; and the gradient of a linear area before a first zero point of the normalized autocorrelation function is the crossing time of the red cells transversely penetrating through detecting focal spots, and the transverse speed of the red cells is the transverse width of the detecting light focal spots.

The invention discloses a device and method for determining the midline equation of a fish in motion. The device comprises a base. A bottom support sleeve is fixedly mounted on the base, a vertical telescopic rod is installed inside the bottom support sleeve through a first bolt, a fist horizontal rod and a second horizontal rod are vertically welded on the vertical telescopic rod, a horizontal telescopic rod is mounted inside the first transverse rod in a sleeveing mode through a second bolt, a support plate is fixed at the end of the horizontal telescopic rod, a camera fixing clamp is fixedly arranged on the top of the support plate, a camera light source is fixedly mounted at the end of the camera fixing clamp, and a camera is detachably mounted on the camera fixing clamp. The midline coordinates and the midline equation can be used to explore the relationship between the longitudinal and transverse velocities, pressures, vortices and so on at the body profile of a fish and the swinging angle and the amplitude of the fish body so as to provide a new idea and method for aquatic creature researchers, especially fish researchers.

The invention discloses a high-precision speed measurement method based on binocular stereoscopic vision. The method comprises the following steps of (a) setting a longitudinal speed measurement binocular camera and a transverse speed measurement binocular camera; (b) calibrating the longitudinal speed measurement binocular camera and the transverse speed measurement binocular camera to obtain a corresponding relation between the camera pixel points and the actual size; (c) acquiring an image of the moving object by using a longitudinal speed measurement binocular camera and a transverse speedmeasurement binocular camera, and acquiring feature points of the moving object through SIFT corner detection; (d) respectively calculating vehicle distances directly corresponding to two adjacent frames of images by utilizing a binocular parallax algorithm, and calculating longitudinal speed components and transverse speed components of the moving object according to the frame rate; and (e) properly synthesizing the longitudinal velocity component and the transverse velocity component to obtain the velocity of the moving object, so that the problems that the distance estimation can be carried out only by recognizing a measured object in advance in existing bullet screen distance measurement, the transverse movement speed of part of vehicles is ignored, and the measurement precision is not high enough, are solved.

The invention relates to a method for determining an acceleration of a target or an object by means of radar waves. In a first step, at least one radar-emitting signal is emitted by means of an emission device. At least one radar-receiving signal reflected by a target is received and subsequently transmitted to an evaluation unit. The evaluation unit converts the radar-receiving signals into digital measuring values and is used to further process the digital measuring values. In a further step, the digital measuring values are subjected to a two-dimensional Fourier transform. At least one target reflex is detected from a resulting magnitude spectrum or distance-speed spectrum, on the basis of peak values. Based on the distance-speed spectrum, at least one distance of a target from the emission device, at least one radial speed and at least one transverse speed of a target are determined in relation to the emission device. Subsequently, at least one angle of the at least one target is determined in relation to an orientation of the emission device. On the basis of the determination or calculation of the distance, the transverse speed and the angle, the signal portions respectively relevant to the estimation are separated. For at least one target reflex of an actual target or object, at least one radial acceleration is approximately calculated following an inverse Fourier transform of the remaining repeatedly transformed measuring values. The invention also relates to a radar device.

A vehicle safety protection method and system and driving control device are provided, wherein the method includes obtaining relative lateral motion parameters of a vehicle on a side of the vehicle and the vehicle, wherein the relative transverse motion parameters include a relative transverse velocity and a relative transverse distance; judging whether a side collision working condition will occur according to the relative lateral motion parameters; raising the chassis when side impact conditions are determined to occur. By adopting the scheme, the degree of vehicle damage during side impactcan be reduced and the protection for vehicle occupants can be improved.

The invention relates to a two-dimensional ion beam deflection device, comprising an x-axis deflection polar plate, a lens polar plate component and a y-axis deflection polar plate; the x-axis deflection polar plate, the lens polar plate component, and the y-axis deflection plate are sequentially arranged along the ion beam transmission direction, a deflection voltage is applied to the x-axis deflection polar plate and the y-axis deflection polar plate, the lens polar plate component is grounded, and the length-to-clearance ratio of the x-axis deflection polar plate and the y-axis deflection polar plate is larger than or equal to 4. According to the two-dimensional ion beam deflection device in the invention, a grounded lens polar plate is additionally arranged between the x-axis deflection plate and the y-axis deflection plate, thereby reducing the field effect while increasing the length of the deflection device; transverse velocity dispersion of the ions can be reduced by applying an appropriate electrostatic field intensity; and the length-to-clearance ratio of the deflector is improved to the maximum extent so as to reduce the electric field penetration and consequently reducethe problems of distortion and large dispersion of the ion beam.