59 results about "Absolute velocity" patented technology

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.

An obstacle detection apparatus in a host vehicle derives the value of absolute speed of a target object such as a preceding vehicle, and the distance of the object from the host vehicle, and compares the absolute speed with a threshold value that is increased in accordance with increase in value of a parameter which adversely affects the accuracy of deriving the absolute speed of the target object, such as the distance of the target object from the host vehicle or the running speed of the host vehicle. A judgement as to whether the target object is stationary or in motion is made based on results of the comparison.

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.

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).

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.

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.

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.

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 the correlation feature and the wheel spacing (B).

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.

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 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.