60 results about "Absolute velocity" patented technology

The invention discloses a real-time vehicle trajectory predicting method and device based on radar detection data. The real-time vehicle trajectory predicting method includes the steps that accordingto the data collected by a vehicle sensor and a radar in real time, the absolute velocity and direction of a target vehicle and the included angle and the included angle change rate of the velocity direction between a vehicle and the target vehicle are calculated, and then the yaw velocity of the target vehicle is calculated through the included angle change rate and the yaw velocity of the vehicle; the turning radii of the vehicle and the target vehicle are calculated by using the velocities and the yaw velocities of the vehicle and the target vehicle correspondingly; and finally, travellingtrajectories of the vehicle and the target vehicle are predicted, and the trajectory of the target vehicle is transferred into a vehicle coordinate system of the vehicle to be calculated through the relative distance and the included angle of vehicle coordinate systems of the vehicle and the target vehicle. The real-time vehicle trajectory predicting device comprises the radar, a vehicle-mounted sensor, a controller and an actuator. The real-time vehicle trajectory predicting method and device based on the radar detection data has the advantages that the travelling trajectory of the vehicle and the travelling trajectory of a target object in the environment can be predicted accurately and in real time, collision danger is judged timely, and safety and stability of vehicle travelling are improved.

The present invention relates to a method and an apparatus of operating an obstacle avoidance system with camera vision. The invention is used during both day and night, and provides a strategy of obstacle avoidance without complicated fuzzy inference for safe driving. The method includes the following steps: analyzing plural images of an obstacle, positioning an image sensor, providing an obstacle recognizing flow, obtaining an absolute velocity of a system carrier, obtaining a relative velocity and a relative distance of the system carrier with respect to the obstacle, and providing a strategy of obstacle avoidance.

A method for detecting critical driving situations of motor vehicles, in particular for preventing collisions with an object in front of an own vehicle, has the following steps: detection of a current vehicle acceleration and a current vehicle velocity of an own vehicle; specification of an acceleration profile depending on driving variables of the own vehicle; assumption of a time progression of a foreseeable acceleration of the own vehicle based on its current acceleration; determination of a path profile of the own vehicle from the time progression of the foreseeable acceleration; acquisition of a current distance and a current relative velocity of an object in front of the own vehicle; calculation of the current absolute velocity of the object as well as of the absolute current acceleration of the object; assumption of a time progression of a foreseeable acceleration of the object based on its current acceleration; determination of a path profile of the object from the time progression of the foreseeable acceleration; comparison of the path profile of the own vehicle with the path profile of the object; and if the two path profiles intersect, determination of a probable collision time of the own vehicle with the object; establishment of a time before the probable collision time comparison of this time with the probable collision time determined; and if the probable collision time lies before the established time, issue of a warning to the driver of the own vehicle.

The invention belongs to the technical field of navigation and provides an integrated navigation and positioning system and method for a submarine oil and gas pipe detection robot. The integrated navigation and positioning system mainly comprises a differential GPS system, an ultra-short baseline positioning system (USBL), a strapdown inertial navigation system (SINS), a Doppler log (DVL) and thelike. The differential GPS system accurately positions geographic position coordinates of a surface vessel; the ultra-short baseline positioning system determines a three-dimensional vector position of the underwater unmanned aerial vehicle relative to the water surface unmanned ship; the strapdown inertial navigation system detects the real-time course and attitude of the underwater unmanned vehicle; and the Doppler log detects the absolute running speed of the underwater unmanned vehicle. The SINS and the DVL are combined to realize short-time high-precision positioning of the underwater unmanned vehicle, and the differential GPS and the USBL are combined to realize absolute positioning of the underwater unmanned vehicle; the long-endurance and long-voyage high-precision positioning of the underwater unmanned vehicle is realized, and the accurate position information is provided. The invention further provides a combined positioning method of various navigation instruments, and a solution is provided for underwater high-precision combined navigation.

A method is provided for estimating vehicle velocity for a vehicle using a single-antenna global positioning system (GPS). An absolute speed and a course angle of the vehicle is measured using the single-antenna GPS. The yaw rates of the vehicle are measured independently of the GPS. An integrated yaw rate of the vehicle is calculated as a function of the measured yaw rates over a period of time. A yaw angle is determined as a function of a reference yaw angle and the integrated yaw rate. Aside slip angle is calculated as a function of the estimated yaw angle and the course angle provided by the GPS. The vehicle velocity is determined as a function of the absolute speed and the side slip angle. The vehicle velocity is provided to a vehicle dynamic control application.

Determining the direction of a direct arrival path between a receiver and a transmitter in a multipath environment by determining a transmitter heading relative to the receiver as proportional to a frequency offset of the direct path signal component relative to a multipath pedestal, an absolute velocity of the transmitter as proportional to a width of the multipath pedestal, a relative velocity between the transmitter and the receiver as proportional to a magnitude and a direction of doppler shift of the direct arrival component of the received signal relative to the doppler pedestal, and an amplitude of the multipath pedestal as proportional to a number and magnitude of scatterers in the multipath environment. The method is applied for continuous wave and modulated signals, for stationary and moving transmitters and for tracking and mapping transmitter paths.

The invention discloses a real-time orbital maneuvering control method based on target orbital parameters, and relates to the technical field of control-and-guide controlling. The method comprises thesteps that target orbital elements are always taken as computation conditions in each iteration computation period, a theoretical shutdown point is deduced according to the initial values of launch data of a carrier, the distance from the Earth's center to a celestial body, absolute velocity, local ballistic pitch and an orbital pitch of the theoretical shutdown point are calculated, and the deflection amount relative to a target nominal value and a corresponding Jacobian matrix are resolved; the pitch program angle correction, yaw program angle correction, remaining flight time correction and pitch program angle variation rate correction in the current iteration computation period are resolved according to the Jacobian matrix, correction is conducted, and the correction results are takenas the initial values of the next iteration computation period; attitude control and shutdown control are conducted according to the computer flight program angle and the remaining flight time in thecurrent iteration computation period. The method has the advantages that real-time computation of a control-and-guide controlling system of the carrier is achieved, and the method has a higher engineering application value.

The present invention relates to a process for the separation of gluten and starch from wheat flower, wherein in a first step the wheat flour is converted into a dough having a moisture content of less than 50 wt %, based on dry weight of the flour. The dough is in a subsequent step subjected to an essential simple shear flow with a shear stress of at least 1 kPa and a specific mechanical energy input of at least 5 kJ / kg per minute processing time to obtain a processed dough. It is preferred that the apparatus used for performing this step comprises a reactor of the cone-and-plate type or the cone-cone-type wherein an absolute velocity profile across the conical gap is present. In a final step, the processed dough is separated into a gluten enriched fraction and a starch enriched fraction. The gluten enriched fraction is very suitable for bakery applications.

In a configuration of a technique in the related art, since two Doppler sensors are used to measure velocity in two directions, and a set of transmission circuit and reception circuit are provided for each of directions to be measured, a device becomes large and expensive. Moreover, in the related art, since signal processing is performed by using output of each of the two Doppler sensors, axis adjustment in each of emission directions of the two Doppler sensors needs to be performed separately, therefore there is a difficulty that appropriate axis adjustment is complicated and difficult. An absolute velocity measuring device is mounted in a vehicle, and includes a transceiver for transmitting and receiving a wave, a transmission-wave branch section that branches a unidirectional wave transmitted from the transceiver in a plurality of directions, and converges reflected waves of waves branched in the plurality of directions from the ground into the unidirectional wave to be received by the transceiver, and a signal processing section that obtains a signal based on a reflected wave that has been received from the transceiver, and processes the obtained signal and thus calculates a plurality of kinds of behavioral information of the vehicle, and then outputs the relevant behavioral information.

A three-dimensional (x′-axis, y′-axis and z′-axis based) combined light-based apparatus for measuring the absolute velocity and acceleration of a material object in space. The apparatus has for each axis, while each axis is perpendicular to each other axis, an identical set-up of: a photon (light) emitting source; zero to multiple mirrors; a photon sensitive sensor, possibly CCD-based. The emitted photons are directed to the sensor with or without one or multiple reflections from zero to multiple mirrors. The photons, emitted by the source, arrive at the sensor at a location determined by the momentarily absolute velocity of the apparatus in Newton's absolute space; the absolute velocity of the apparatus thus being calculable from this location on the sensor by adequate mathematical formulas. During acceleration, the time derivative of the location's shift is a function of the value of the acceleration of the apparatus; the acceleration of the apparatus is thus calculable from the time derivative of this location's shift by adequate mathematical formulas. If the velocity in only one direction (one dimension) should be measured, a single velocity measuring set-up is adequate.

A method of determining the velocity (ν) of a vehicle is provided. The vehicle has at least one pair of a front and a rear wheel which are spaced by a wheel spacing (B). Front and rear wheel speed signals (ω) are determined which are indicative of the time dependent behavior of the front and rear wheel speeds, respectively. The front and rear wheel speed signals (ω) are correlated in order to determine a specific correlation feature indicative of the time delay (τ) between the front wheel and rear wheel speed signals. The velocity (ν) of the vehicle is determined based on said correlation feature and the wheel spacing (B).

Whirl flow of leakage flow is reduced to reduce the occurrence potential of steam whirl.A rotor oscillation preventing structure for a steam turbine includes: a stator vane 3; a moving blade 1; a shroud cover 2 installed on an outer circumferential side distal end of the moving blade 1; and a plurality of seal fins 6 installed, at any interval in the axial direction of a rotor, on an wall surface of a stationary body located on an outer circumferential side of the shroud cover 2, a whirl preventing structure comprised of whirl preventing plates 9 or whirl preventing grooves 11 is provided at a shroud cover inlet return portion 10 of the shroud cover 2 so as to block the whirl flow of leakage flow 8 on an upstream side in an operating steam flow direction of the seal fins to reduce an absolute velocity component of the leakage flow 8 in a rotational direction of the rotor.

The invention discloses a method of improving gravity field inversion precision based on disturbance intersatellite relative velocity. The method comprises steps that according to a satellite-borne range finer and a satellite-borne GPS receiver, and a disturbance intersatellite relative velocity (img file='DDA001263047990000011. TIF' wi='216' he='78'), a single satellite disturbance absolute velocity, and a disturbance absolute position are determined; according to the single satellite disturbance absolute velocity, a Lagrange interpolation formula is adopted to calculate a double-satellite disturbance absolute acceleration vector difference (img file='DDA0001263047990000012. TIF' wi='190' he='79'); according to the disturbance absolute position, a unit vector is determined; according to the determined unit vector and the double-satellite disturbance absolute acceleration vector difference (img file='DDA0001263047990000013. TIF' wi='202' he='78'), the line of sight (img file='DDA0001263047990000015. TIF' wi='347' he='78') of the determined double-satellite disturbance absolute acceleration vector difference (img file='DDA0001263047990000014 TIF' wi='166' he='79') is determined; according to the line of sight (img file='DDA0001263047990000015. TIF' wi='347' he='78') and the disturbance intersatellite relative velocity, a disturbance intersatellite relative velocity observation equation is determined; according to the disturbance intersatellite relative velocity observation equation, earth gravity field inversion is carried out, and earth gravitation potential coefficient precision and accumulated geoid precision are determined. The method is advantageous in that the inversion of the earth gravity field is carried out accurately and quickly, and the earth gravity field inversion precision and spatial resolution are improved.

A head positioning system includes: a positioning mechanism section 1 for positioning a head 12; a position controller 2 for detecting a head position signal x to output a position control signal Ux; a velocity detector 3 for detecting the relative velocity of the head 12 with respect to a disk 7 based on the head position signal x; a counter electromotive voltage detector 4 for outputting an estimated head velocity signal Ve2 that is obtained by estimating the absolute velocity of the head 12 based on a counter electromotive voltage signal Vs of an actuator 50; an estimated velocity corrector 5 for correcting an estimation error of the estimated head velocity signal Ve2 based on a velocity signal detected from the head position signal x so as to output a corrected estimated velocity signal Ve2′; and an estimation controller 6 for outputting a velocity control signal Uv based on the corrected estimated velocity signal Ve2′, wherein the actuator 50 is controlled by a control amount signal U that is obtained by adding at least the velocity control signal Uv to the position control signal Ux.

The invention discloses a device for transferring rod-like product, which comprises at least two pairs of cam spacers and a delivery roller. Each pair of the cam spacers are arranged at the front side of the delivery roller side by side; at least two rows of receiving tanks are arranged on the delivery roller along the axial direction and communicate with each other via through holes; each row of the receiving tanks comprises multiple receiving tanks distributed along the circumference of the delivery roller; each receiving tank is axially parallel to the delivery roller, and is provided with a negative-pressure suction hole at the bottom; the outlet of each receiving tank communicates with a compressed air passage that is provided with a positive-pressure air blow hole; and a positioning plate is disposed at one end of each row of receiving tanks. A plurality of rod-like products in continuous high-speed movement can complete a conversion from horizontal linear motion to circular motion within a short time; and the absolute velocity of cigarettes can be reduced at the same time. The invention also discloses a method for transferring rod-like product.

The invention relates to an absolute train speed measuring device, which is arranged close to a track on a train and comprises a basal body, an optical lens arranged on the basal body and positioned above a track, a light source arranged outside the optical lens, a data acquisition unit capable of acquiring a track image with high frequency and small data volume and a signal processing unit for processing the image to acquire speed and direction information. The data acquisition unit is arranged in the basal body and positioned above the optical lens, and the signal processing unit is arranged in the basal body and connected with the data acquisition unit. The invention further relates to a train speed calculating method, wherein the absolute speed value of the train is calculated by adopting a spatial filtering method, and the speed direction of the train is recognized by adopting a Fourier algorithm or a recognition method of a D trigger or installing an acceleration sensor in the train. The absolute train speed measuring device and the speed calculating method can accurately measure the absolute speed of the train relative to the ground in real time, are small in measuring dead area and are not influenced by climates.

The invention discloses a multi-dimensional vibration sensor. In the multi-dimensional vibration sensor, an eddy current sensor and an absolute velocity sensor are arranged in a shell; an end part of the shell is provided with a flat induction coil; the induction coil is fixed at one end of a stainless steel bolt; a lead of the induction coil is connected with a processing circuit of an internal proximitor; the eddy current absolute velocity sensor is arranged in the shell; the absolute velocity sensor consists of disc upper and lower soft reeds, permanent magnet steel, a damping cup, a magnetizer, a connecting rod, a bracket and a moving coil; the moving coil is fixed on the connecting rod and the bracket; a permanent magnet steel strip and the magnetizer are fixed; the section of the magnetizer is H-shaped; the permanent magnet steel is fixed in the middle of an H-shaped horizontal strip; the moving coil is sleeved on the magnet steel on the upper part of the H-shaped horizontal strip, and the lower part of the H-shaped horizontal strip is connected with the damping cup; and centers of the disc upper and lower soft reeds are fixed on the connecting rod, the bracket and the damping cup respectively, and edges of the discs of the disc upper and lower soft reeds are fixed on the shell.

The invention discloses a self-calibrating method and system for laser-induced-fluorescence-based speed measurement. The self-calibrating method comprises: exiting laser is modulated to apply two beams of laser in opposite directions in a to-be-measured flow field to a to-be-measured particle in the to-be-measured flow field; the strength of a fluorescence signal from the excited to-be-measured flow field on the laser path is measured to obtain a practical-measuring fluorescence spectrum profile; and fitting is carried out on the practical-measuring fluorescence spectrum profile to obtain a first fluorescence spectrum profile and a second fluorescence spectrum profile that correspond to the two beams of laser in opposite directions and numerical average value solving is carried out on central frequency points of the first fluorescence spectrum profile and the second fluorescence spectrum profile to obtain a laser frequency corresponding to an absolute speed zero point. Therefore, in-situ calibration is realized; and separate construction of a reference plasma source is not required. The calibration plan is simplified and the measuring cost is saved; a measuring error caused by a Stark effect under the circumstance of unequal densities between the reference plasma source and a to-be-measured plasma can be eliminated; and the measuring precision is improved.

An improved algorithm for skylight control of a semi-active suspension system of a vehicle is provided. The algorithm includes the following steps: The acceleration sensor signal is first acquired andprocessed to obtain the sprung mass acceleration signal (img file= 'DDA000173614679000011. TIF' wi= '77' he= '63' / ) the sprung mass absolute velocity (img file= ' DDA0001736146790000012. TIF 'wi=' 79'he=' 63 ' / ) Unsprung mass speed (img file=' DDA00017361467900013. TIF 'wi=' 45 'he=' 55 ' / ) and the relative speeds of the sprung and unsprung masses (img file=' DDA00017361467900014. TIF 'wi=' 191'he=' 55 ' / ) are then calculated by the ECU controller (img file=' DD A0001736146790000015. TIF 'wi=' 262 'he=' 65 ' / ) wherein, When (img file= 'DDA0001736146790000016. TIF' wi= '317' he= '64' / ), thedamping coefficient Cmin of the output magnetorheological damper. ; When (img file= 'DDA00017361467900017. TIF' wi= '316' he= '64' / ), The ECU controller performs the next data calculation (img file= 'DDA000173614679000018. TIF' wi= '142' he= '56' / ) when (img file= 'DDA0001736146790000 019. TIF 'wi=' 195 'he=' 57 ' / ), the maximum damping coefficient Cmax is selected; When (img file= 'DDA0001736146700000110. TIF' wi= '195' he= '57' / ), the relative damping coefficient Cmid obtained by particle swarm optimization is selected. On the basis of the traditional skyhook control algorithm, the inventionfurther considers the influence relationship between the vehicle speed and the acceleration, and effectively improves the ride comfort on the premise of guaranteeing driving safety and stability. Theimproved control algorithm of the invention is simple and easy to operate, has good real-time performance and high stability, and is suitable for wide application.

It is an object of the present invention to provide an object detecting device and an object detecting method capable of performing appropriate object detection by distinguishing an approaching moving object from a stationary object accurately. The relative velocity of an object, which exists in the lateral direction of a vehicle, with respect to the vehicle is detected, the absolute velocity of the object in the horizontal direction of the vehicle is calculated on the basis of the detection signal, and it is determined whether or not the object is an approaching moving object on the basis of the absolute velocity of the object in the horizontal direction of the vehicle. Accordingly, since it is possible to accurately distinguish whether an object existing in the lateral or oblique direction of the vehicle is an approaching moving object or a stationary object, it is possible to appropriately determine whether or not the object is an approaching moving object.

Embodiments of the invention provide an estimation method and an estimation system for absolute speed of an obstacle, computer equipment and a storage medium. The estimation method for the absolute speed of the obstacle can include the following steps: measuring the absolute speed of a motor vehicle at a current time t1 by utilizing integrated navigation equipment, and storing the absolute speed in a data table; obtaining the relative speed of the obstacle relative to the motor vehicle at a second time t2 by utilizing a millimeter wave radar; correcting the relative speed at the second time t2to the relative speed at the current time t1; and adding the absolute speed of the motor vehicle at the current time t1 and the relative speed at the corrected current time t1 of the obstacle to obtain the absolute speed of the obstacle at the current time t1. By means of the technical solution of the method and the system, measurement of the speed of the obstacle is more accurate.

The invention relates to a double-stator reluctance motor with a self air-cooled rotor, and belongs to a reluctance motor. The motor comprises a rotor, an internal stator and an external stator, internal and external salient-pole teeth of the rotor and salient-pole teeth of the internal stator and the external stator are oblique teeth in a structural shape of an axial-flow fan blade, and the oblique teeth of the internal and external salient-pole teeth of the rotor in the structural shape of the axial-flow fan blade are decided by an air intake angle beta=tan<-1>C / U and an air outlet angle alpha=tan<-1>C / (U-C2u), wherein C is air intake absolute velocity, U is rim speed, C2u is equal to Lu / U, and Lu is rim power. In order to keep electrical property of the motor invariant, shapes of the salient-pole teeth of the internal stator and the external stator are matched with structures of the internal and external salient-pole teeth of the rotor. When the rotor of the motor rotates, the axial-flow fan blade structure of the internal and external salient-pole teeth of the rotor and the axial-flow fan blade structure of the salient-pole teeth of the internal stator and the external stator generate air suction force together to introduce the air inside the motor to be exhausted by an outlet, so as to take away heat of the rotor of the motor and achieve self air cooling. Therefore, the size of the motor can be optimized, and volume and weight of the motor can be reduced.

The invention discloses a nuclear power plant earthquake monitoring method, device and system. The earthquake monitoring method comprises the steps of when occurrence of an earthquake is monitored, acquiring free field earthquake response time-displacement data and nuclear island foundation layer earthquake response time-displacement data of a plurality of main monitoring sensors within a preset time period before a triggering moment; respectively calculating a free field earthquake response spectrum and free field standard cumulative absolute velocity, and respectively calculating a nuclear island foundation layer earthquake response spectrum and nuclear island foundation layer standard cumulative absolute velocity; and triggering shutdown when both the free field earthquake response spectrum and the free field standard cumulative absolute velocity exceed a preset shutdown threshold or both the nuclear island foundation layer earthquake response spectrum and the unclear island foundation layer standard cumulative absolute velocity exceed the preset shutdown threshold. Compared with the prior art, the earthquake reaction spectrum and the standard cumulative absolute velocity are adopted to act as parameters of earthquake impact assessment, the influence and intensity of earthquake motions can be evaluated stably and accurately, and false triggering is avoided.

Data from the piezo-electric sensors in the mounts for the projection system can be used in the control loops for other parts of the lithographic apparatus, for example the mask table, the substrate table or the air mounts for the frame bearing the projection system. Information from, for example, a geophone, which is used to measure the absolute velocity of the frame bearing the projection system, can be used in the control loop for the piezo-electric actuator in the mount for the projection system.

A mobile body includes a direction identifying unit that identifies a direction in which a communication target mobile body is positioned and a control unit that moves the mobile body by a first control amount indicating a pair consisting of a first absolute velocity value and a first velocity direction. Upon detecting that predetermined information is no longer received from the communication target mobile body, the control unit determines a second control amount by which the autonomous mobile robot is to be moved in the direction identified by the direction identifying unit and which indicates a pair consisting of a second absolute velocity value and a second velocity direction, and the control unit generates a second control command to switch the first control amount to the second control amount and move the autonomous mobile robot and outputs the generated second control command to a drive unit.