88 results about "Displacement velocity" patented technology

In a power device 1 having a speed reducer 3 and a spring member 4 having elastic characteristics to a power transmission system between an actuator 2 and a driven element 5, an operation target of the actuator 2 is determined according to a linear coupling value of values that are obtained by passing through low-pass filters, a deviation Δω12 between an estimated value ω1_e of a displacement velocity of an input unit 4a of the spring member 4 and an estimated value ω2_e of a displacement velocity of the driven element 5, and a deviation Δθdef between a measured value θdef_s of a deviation difference between the input unit 4a of the spring member 4 and the driven element 5, and a target value θdef_cmd of the displacement difference corresponding to a target driving force τref of the driven element 5.

The invention discloses a method for controlling the displacement velocity of an air mouse cursor. In the method, a horizontal obliquity value is measured by an obliquity sensor embedded in an air mouse, and the displacement velocity of a cursor is calculated according to the horizontal obliquity value. When the horizontal obliquity value is less than a preset stopping angle, and the horizontal obliquity value is not changed within certain time, the air mouse is considered as being static, and the cursor is stopped moving even if a slight amount of obliquity angle exists. Contrarily, if the horizontal obliquity value is changed, the cursor is processed for single-point movement by the form of a slight amount of movement or a screen pixel point moving at a time. The method can overcome the problem that the cursor is not easy for positioning exactly when the air mouse is operated.

The invention provides a method for reconstructing target three-dimensional scattering center inverse synthetic aperture radar. The method for reconstructing the target three-dimensional scattering center of the inverse synthetic aperture radar comprises the following steps: conducting continuous image formation on echo data after motion compensation so as to obtain an ISAR two-dimensional image sequence; respectively conducting horizontal scaling and vertical scaling on the information storage and retrieval (ISAR) two-dimensional image sequence so as to obtain a position coordinate of the scattering center; and respectively extracting a position coordinate of the scattering center in an ISAR two-dimensional image of each frame, calculating a displacement velocity field of every two adjacent frames of the scattering center of the ISAR two-dimensional image, combining projection equation and target motion equation of an orthographic projection model so as to obtain estimated values of a third dimension coordinate by combining a projection equation and a target motion equation of an orthographic projection model, and averaging multiple estimated values to obtain the final third dimension coordinate. Therefore, reconstruction of the target three-dimensional scattering center is completed directly. The method for reconstructing the target three-dimensional scattering center of the inverse synthetic aperture radar does not need cost of extra system hardware, can distinguish scattering centers with different heights in the same distance and position resolution unit, does not need to utilize prior information such as observation perspective of the radar, and has relatively small calculating amount.

Methods and apparatus are provided for measuring multiple operating parameters of a rotating shaft with a sensor. One embodiment of the apparatus comprises a sensor in close proximity to a matched pair of thumbnail depressions on the surface of a rotating shaft body. The thumbnail depressions enable the sensor to detect axial displacement and rotational speed of the shaft in addition to detecting radial displacement of the shaft body. Signal processing circuitry analyzes the sensor output data and computes separate values for the axial displacement, speed and radial displacement parameters. Additional filtering and signal processing techniques can be used to ascertain peak axial displacement, to reduce noise, and to compute other parameters, such as acceleration and power spectral density.

The invention provides a pump which has reduced pressure loss by using fewer mechanical on-off valves, which has increased reliability, which can be used under a high load pressure, which can be driven at a high frequency, and which has good drive efficiency by increasing discharge fluid volume per pumping period. A circular diaphragm, disposed at the bottom portion of a case, has its outer peripheral edge secured to and supported by the case. A piezoelectric device to move the diaphragm is disposed at the bottom surface of the diaphragm. A space between the diaphragm and the top wall of the case is a pump chamber. An inlet flow path, having a check valve serving as a fluid resistor disposed thereat, and an outlet flow path, which opens to the pump chamber during operation of the pump, open towards the pump chamber. In the pump, driving of the piezoelectric device is controlled so that an average displacement velocity in a pump chamber volume reducing step of the diaphragm becomes a velocity at which the diaphragm reaches the reached-displacement-position in a time equal to or less than ½ and equal to or greater than 1/10 of a natural vibration period T of fluid inside the pump chamber and the outlet flow path.

The invention provides a method for controlling parking consistency of a train set of a multi-agent system. The method includes the steps of establishing a multi-agent system model of a distributed train set, designing a PID controller according to the control target to track a displacement speed curve of a virtual navigator, and designing a composite tracking controller which comprises a slidingmode variable structure observer to feed disturbance information back to the controller. The tracking precision is improved, and the anti-jamming capability is high. The tracking controller designed by the invention can track the consistency of the braking speed of the train set. The adjacent carriages are always in a safe vehicle distance.

A long-range optical device has at least one optical channel, which has a housing and an arrangement of optical elements, wherein at least one of the optical elements is movable relative to the housing for image stabilization in the event of perturbing movements of the housing. The device further has a first passive stabilization system based on mass inertia for the at least one movable optical element, which, in the event of displacement of the at least one optical element relative to the housing, generates a first restoring force proportional to the displacement and a second restoring force proportional to the displacement velocity. The first stabilization system is designed for image stabilization in the event of perturbing movements in a first frequency range. The long-range optical device has at least one second stabilization system, which is coupled to the first stabilization system and is designed for image stabilization against perturbing movements in at least one second frequency range, wherein the first and the at least one second frequency ranges are at least partially different.

The invention discloses an experimental method for simulating fault slip. The experimental method comprises the following specific steps: I, processing a rock sample; II, setting a sound emission probe on each of a rock A and a rock C, and setting four sound emission probes on a rock B; III, placing the rock C in a pressure chamber of a micro-control rock servo pressure tester, placing the rock B on the rock C, placing the rock A on the rock B, and laying quartz powder with identical particle size on contact surfaces of the rocks to form quartz powder layers; IV, applying axial pre-stress; and V, performing experimental record and analysis, wherein horizontal shear force is applied to a combination at a constant displacement speed, a sound emission system starts working, the sound emission probes are used for acquiring data in real time, waveforms generated by the data are recorded in the sound emission system and then are converted into digital signals through a built-in AD conversion card, and the digital signals are stored in a computer hard dick. The experimental method is simple in operation and convenient in use, and is capable of simulating fault slip so as to improve the accuracy of data detection.

Performing data processing more effectively for camera shake correction is desirable. Movement of an image-capturing device is compensated on the basis of displacement velocity of the image-capturing device detected by a displacement velocity detector and position regarding a focus adjustment member of the image-capturing device detected by a position detector. An input data format converter converts the displacement velocity detected at the displacement velocity detector from fixed-point format to floating-point format and converts the detected position of the focus member to floating-point data. Furthermore, a gyro filter uses data processing in floating-point format to calculate displacement data for a required amount the image-capturing device is to be displaced and a Hall filter uses data processing in floating-point format to generate drive data for the focus adjustment member. Then, the drive data in floating-point format from the Hall filter is converted to drive data in fixed-point format.

A displacement detecting method of the present invention includes the steps of driving a moving part 3 using a drive unit 1, detecting a displacement amount 6 (detected angle θm′) of the moving part 3 using a displacement detector 5, correcting the displacement amount 6 (detected angle θm′) using a displacement correction table so that a displacement velocity (dθm′/dt) of the displacement amount 6 (detected angle θm′) detected by the displacement detector 5 is constant, and detecting a displacement amount (detected angle θm″) corrected by the displacement correction table as the displacement amount of the moving part 3.

The present invention concerns a single-particle LIDAR anemometry method and system comprising the continuous emission of one or more light beams through a gas containing particles, said beam being focused onto a measurement volume, a step of detecting a signal backscattered by particles passing through said volume, the method being characterized in that it comprises at least the following phases:

• • determining in a time period Δt the frequency of each of the pulses included in the backscattered signal;
  • distinguishing pulses based on duration and/or intensity and/or frequency-modulation criteria; and
  • estimating the displacement velocity of said beam relative to the gas from several of the frequencies determined over the time period Δt excluding those corresponding to the pulses distinguished during the preceding step

A notable application of the invention is for the measurement of the airspeed of an aircraft

An apparatus for measuring speed of movement of an object deforming lines of Earth's magnetic field includes a first and second magnetometer disposed on either side of a traffic roadway for the object and substantially perpendicular to the object. The magnetometers are configured for measuring deformation of Earth's magnetic field by the object travelling over the roadway. The apparatus also includes a processing unit configured for extracting, from each of the magnetometers, a measurement value corresponding to a quotient defined by a distance of the object with respect to the magnetometer divided by a speed of movement of the object, and for calculating a speed of the object from the measurement values and a geometrical disposition of the magnetometers with respect to one another and with respect to the traffic roadway.

The present invention provides a dynamic performance test device for linear rotating motor. The device comprises a measured linear rotating electric machine, a motor base, a test platform base, a first bottom plate, a second bottom plate, a rotating speed and torque tester, a rotary load, a slider and a slide rail, a stop plate, a limit switch, a thrust sensor, a displacement speed sensor and a linearly rotating load. The measured linear rotating electric machine is connected to the motor base and fixed to the first base plate, and the first base plate is fixed on the test platform base. The output shaft of the measured linear rotating electrical machine is connected with the rotating speed and torque tester and connected with the first rotating load. The rotating speed and torque tester and the first rotating load are fixed on the second bottom plate provided with the slider. The device realizes the same platform measurement of linear, rotating and spiral motion of the linear rotating machine and enables the dynamic performance test under each motion modes, improves the testing efficiency. The test device is simple in structure, high in precision, and simple and convenient in operation.

An optical device for measuring the displacement velocity of a first movable element in relation to a second element which is fixed to one of said elements and comprises two lasers transmitting two incident beams towards the other elements. The device including photosensitive linear arrays for front and rear detection which are substantially perpendicular to each other. Additional front and rear photosensitive linear arrays are disposed at a distance from the photosensitive front and rear linear arrays. A processing circuit is connected to the photosensitive linear arrays and determines the longitudinal and/or transversal displacement velocity of the movable element. The circuit also determines the distance between the device and the other element by means of optical triangulation and corrects the longitudinal and/or transversal displacement velocity value according of the said distance.

The present invention aims to achieve accurate measurement and evaluation of mechanical properties of an object to be measured 1 without use of a force sensor. A weight 3 is attached to the object to be measured 1 to form a mass-spring system in which the object to be measured 1 serves as a spring element. Then vibration is applied to the mass-spring system to measure the inertial force acting on the weight 3 and the displacement of the weight 3 so that the mechanical properties of the object to be measured 1 will be evaluated based on the inertial force and displacement. A light wave interferometer 6 measures the displacement velocity of the weight 3 to calculate the inertial force from the acceleration determined by differentiating measured values of the displacement velocity of the weight 3 and calculate the displacement of the weight 3 by integrating the measured values of the displacement velocity of the weight 3.

The invention relates to a service mannequin pressure test system comprising a service mannequin, a pressure sensor, a stageless transmission device, a stepping motor and a data collecting, processing and control module, wherein the pressure sensor is buried in the surface of the service mannequin, the stageless transmission device is connected with the pressure sensor to control the protruded height and the protruding speed on the service mannequin, the stageless transmission device is in control connection with the stepping motor, and the data collecting, processing and control module is connected with the pressure sensor. Compared with the prior art, the invention has the advantages that the pressure sensor, a data connecting wire and the like are hidden in the mannequin without causing the additional deformation of clothing; and the protruded height on the surface of a human body and the displacement speed of the pressure sensor preburied in the mannequin through multipoints can be regulated through the stageless transmission device so that the simultaneous measurement of multipoint clothing pressure can be realized.

An actuator drive control apparatus is equipped with a movement distance setting means for setting a movement distance of a displaceable member, a movement time setting means for setting a movement time, a target value calculating means for calculating a target value of a displacement amount or a displacement velocity of the displaceable member at an arbitrary timing based on the movement distance and the movement time, and a drive controller for generating driving power based on the displacement amount or the displacement velocity target value of the displaceable member and sending the drive power to an actuator.

This invention improves detection precision by reducing a detection error of a change in position of a target. A correction value derivation apparatus for deriving a correction value used in correction of a displacement amount derived based on an encoder signal indicating a change in position of a movable portion as a target, comprises: a displacement amount derivation unit configured to derive a detected displacement amount of the movable portion based on the encoder signal; a displacement velocity derivation unit configured to derive a detected displacement velocity based on the detected displacement amount derived by the displacement amount derivation unit; an average displacement velocity calculation unit configured to calculate an average displacement velocity over a predetermined displacement range; and a correction value derivation unit configured to derive the correction value based on the detected displacement velocity and the average displacement velocity.

An automobile factory planning system and method for controlling a cycle time. The system comprises a conveyor belt configured to transport a plurality of automobiles at a controlled displacement velocity along a manufacturing path through the automobile factory. A feedback device is configured to provide a visual indicator of a designated position at which a next automobile is to be placed on the conveyor belt relative to the position of a previous automobile. The designated position is calculated as a function of the cycle time and the displacement velocity of the conveyor belt.

The disclosure relates to a system and method for determining whether a kick or loss has occurred from a well in real time, wherein the well has a marine diverter having a rotating control device. The marine diverter system may measure flow rate in real time of a drilling fluid entering the wellbore and provide a means of measuring flow rate of the drilling fluid out of the wellbore and riser. The marine diverter system may further determine displacement and velocity of displacement of rig heave motion in real time and use the foregoing steps, given a known internal diameter of the riser and a known external diameter of a drill pipe, and employing a drilling fluid volume balance equation: (Volumetric flow rate-in)−(Volumetric flow rate-out)−(Change in riser annular Volume per unit time)=X, to determine whether the kick or loss has occurred in real time.