55 results about "Rotation velocity" patented technology

The invention discloses a target rotation speed measurement method and device for phase compensation based on polarization assistance, belongs to the technical field of laser rotation speed measurement, and aims to solve the problem that the rotation speed of a moving target cannot be precisely measured in atmospheric turbulence in the prior art. According to the scheme, laser is subjected to polarization and orbital angular momentum composite modulation through a group of spatial light modulators to generate a polarized vortex light beam, and the polarized vortex light beam is emitted by an emission system, passes through atmospheric turbulence and irradiates a rotating target object to generate an echo signal; stokes polarization information before and after distortion of the polarized vortex beam is extracted as input information of a GS algorithm, a compensation phase screen is output after the input information is processed by a distortion correction module, phase correction is carried out on left and right rotation polarization components of the polarized vortex beam, and a detection processing module detects the polarization components of the vortex beam and obtains Doppler frequency shift amount; and the rotation speed of the moving target is calculated through the rotation speed calculation module.

The invention discloses a laser processing method for the surface of a rotating body. The method comprises the steps that a galvanometer is installed on a three-dimensional movement mechanism, and a rotating body to be machined is arranged on a rotating mechanism; configuring laser processing parameters, and importing the laser processing parameters into the to-be-processed rotating body model; calibrating the spatial position relation of the three-dimensional movement mechanism, the galvanometer and the rotating body to be machined, and correcting the galvanometer; planning a laser processing track of the galvanometer and a motion track of the three-dimensional motion mechanism; and the rotating mechanism is started to work, so that the to-be-machined rotating body is in a rotating state, the rotating speed and position of the to-be-machined rotating body are collected, the center of the galvanometer is moved to the initial position of laser machining by controlling the three-dimensional movement mechanism to work, and then laser machining is conducted. By monitoring the position of the laser beam and the rotating speed of the rotating body workpiece in real time, it is ensured that the laser beam can accurately follow the surface of the rotating body to be machined for machining, and the machining precision and the machining efficiency are improved.

The invention discloses a display method for an air gesture rotation operation in a virtual reality environment, relates to the technical field of gesture interaction, and solves the technical problem that the rotation of a virtual object cannot be accurately controlled according to gesture motion data input by a user in real time. According to the gesture position data, calculating a normal vector and an included angle of a plane formed by the two-hand connecting line vector at the fixed time, and converting the normal vector and the included angle into an Euler angle coordinate of a gesture rotation direction and a gesture rotation angular velocity; inputting the Euler angle coordinate of the gesture rotation direction and the gesture rotation angular velocity into a display control mapping model to obtain the rotation direction and the rotation velocity of the virtual object; and displaying the rotation of the virtual object on the virtual reality equipment according to the rotation direction and the rotation speed of the virtual object. According to the method, rotation control of reachable out-of-domain objects can be completed by adopting a bare hand in virtual reality, interaction is natural and smooth, and the method has explainability in behavior; a machine learning method is introduced to intelligently recognize and judge the gesture rotation direction of the user, so that the interaction accuracy is improved; the dynamic non-isomorphic mapping mechanism is applied to the air gesture rotation control operation, and the accuracy of gesture control is remarkably improved.

The present disclosure therefore provides a magnetic sensing system that implements a magnetic multi-turn sensor and an absolute angle sensor in conjunction with a rotating magnet for counting revolutions and providing coarse angular position information, together with an incremental sensor system that uses a rotating disk having a track formed from an Archimedes spiral structure, thereby providing a higher accuracy angle measurement. A magnetic sensing device comprising a multi-turn sensor and an angle sensor is disposed in proximity to a magnet mounted on the end of a rotating shaft. The magnetic sensing device detects a rotating magnetic field to measure the number of revolutions and the absolute angle of the rotating shaft to a first level of resolution and accuracy. The rotating disk is also coupled to the rotating shaft and is formed from a magnetic material. Tracks are then formed on the magnetic disk such that a magnetic incremental sensor detects the periodically changing magnetic field as the disk rotates with the shaft. Then, starting from the angle measurement provided by the magnetic sensing device, a signal output by the incremental sensor can be used to provide a higher resolution measurement of the angular position.

The present invention discloses a method and system for measuring the rate of change of a small refractive index based on vortex light interference. The present invention utilizes two beams of vortex light with opposite topological charge signs as a reference beam and a measuring beam respectively. After the measuring beam passes through a sample to be measured whose refractive index changes slowly, it merges with the reference beam into one beam to form a rotating petal-shaped interference pattern. The rotational angular velocity of the petal-shaped pattern is proportional to the rate of change of the refractive index of the sample to be measured. The interference pattern is collected and recorded using a CCD at a certain sampling frequency, the image collected by the CCD is processed using a normalized cross-correlation method, and a time-frequency analysis method is introduced to obtain the rotational velocity of the interference pattern, and then the rate of change of the refractive index of the sample to be measured is obtained. The present invention avoids the error introduced by measuring the rotation angle of the interference pattern, can measure the rate of change of the refractive index that changes non-uniformly, and can distinguish the direction of the refractive index change.

The invention discloses a rolling angle estimation method and system for a rotary guided projectile, a medium and a product, and relates to the field of projectile guidance and control. According to the technical scheme, firstly, the guidance control system collects a rotation speed signal and a speed change signal after the rotary guided projectile is ejected out of a chamber, and then an accurate kinematics equation set is constructed; secondly, the guidance control system separates the basic rotating speed component and the fluctuation rotating speed component and then combines the components to obtain an actual rotating speed value, a rotating speed estimation value is obtained by constructing a state prediction equation, and then an observation error value is obtained. Then, the guidance control system calculates a mahalanobis distance based on the observation error value, the error covariance matrix and the measurement noise covariance matrix, and determines a weight coefficient to obtain a filtering rotating speed sequence; and finally, the guidance control system performs numerical integration on the filtering rotating speed sequence in a preset time interval to obtain a final rolling angle estimated value. Therefore, the instantaneous rolling angle of the rotary guided projectile in the flight process can be accurately estimated.

The invention relates to a biaxial rotation inertial navigation error modulation parameter selection method based on an error propagation equation, and belongs to the technical field of inertial navigation, and the method comprises the following steps: S1, constructing a biaxial rotation inertial navigation error propagation equation considering an error modulation effect; s2, setting a transposition sequence of the biaxial rotation inertial navigation; s3, based on the error propagation equation constructed in the step S1 and the transposition sequence set in the step S2, obtaining navigation errors at different rotation speeds and navigation errors at different rotation stopping time; and S4, determining the optimal rotation speed and rotation stop time based on the navigation errors at different rotation speeds and the navigation errors at different rotation stop time obtained in the step S3. The method improves the navigation precision of double-shaft rotation inertial navigation, is simple to operate, low in time consumption, low in cost, good in selection effect, high in navigation precision and good in practicability, and solves the problems of long time consumption, high cost, poor selection effect and low navigation precision of the existing empirical method.

Proposed is an optical foreign matter inspection device capable of achieving high accuracy of foreign matter position specification in a wider rotation speed range of a rotary stage.　This optical foreign matter inspection device comprises a first head and a second head for detecting a graduation on an annular scale provided on a rotary stage and outputting a signal. The rotation speed range of the rotary stage to which the first head is compatible with and the rotation speed range of the rotary stage to which the second head is compatible with partially overlap and are relatively different. A calculation control circuit included in the optical foreign matter inspection device sets a head to be used to either the first head or the second head on the basis of the rotation speed of the rotary stage, and determines the rotation angle of the rotary stage on the basis of a signal from the head that is used.

Rotating structure (4) for civil applications, comprising - a fixed part (8) and a movable part (12) which rotates about an axis of rotation (XX) and is equipped with drive means (16) for its rotation about the axis of rotation (XX), - wherein the fixed part (8) and the movable part (12) are coaxial with respect to the axis of rotation (XX), - wherein the drive means (16) are arranged on an outer diameter of the movable part (12) antipodal to the axis of rotation (XX), - wherein the fixed part (8) and the movable part (12) are connected to each other at an inner circular interface (20), corresponding to an inner diameter on the side of the axis of rotation (XX), and at an outer circular interface (24), corresponding to an outer diameter, opposite the inner diameter along a radial direction (RR) perpendicular to and intersecting the axis of rotation (XX), - wherein the rotating structure (4) comprises a first position band (28) with indices and at least one first position encoder (32) configured for optical reading of the first position band (28) in order to provide a measurement of the angular position of the moving part (12), or encoder - wherein the rotating structure (4) comprises a first velocity band (36) with indices and at least one first velocity encoder (40) configured for optical reading of the first velocity band (36) in order to provide a measurement of the angular velocity of the moving part (12), - wherein the first position band (28) and the first position transmitter (32) are arranged according to the inner circular interface (20), - wherein the first speed band (36) and the first speed sensor (40) are arranged according to the outer circular interface (24), - wherein the first speed sensor (40) and the first position sensor (32) are functionally connected to the drive means (16) to enable feedback control of the drive of the drive means (16).

The invention relates to the technical field of drilling monitoring, in particular to a real-time monitoring method and system for mine geological drilling production. Acquiring time sequence data of various operation parameters such as torque, vibration, drilling pressure and rotating speed of the drilling machine; in view of continuous drilling machine abnormity, continuous fluctuation of operation parameters can be caused, and the abnormity occurrence rate of the drilling machine at the current moment is quantified according to the deviation of the drilling pressure value, the rotation speed and the rated value and the fluctuation conditions of the vibration value and the torque value at all moments. Meanwhile, in consideration of abnormal fluctuation of operating parameters caused by mineral resource enrichment and uneven regional rock stratum structure, the coupling condition between torque and vibration is further analyzed, and the operating state abnormal degree value of the drilling machine is determined by combining the operating state abnormal rate of the drilling machine at the current moment. Therefore, the influence of geological factors on a real-time monitoring result is eliminated. And finally, real-time monitoring is carried out based on the state abnormity degree value of the drilling machine at the current moment, and a more accurate monitoring result is obtained.

A method is described for estimating, by measurements taken by an inductive sensor, the time for which an endothermic motor of a tool has operated at predetermined rotating speeds, and an apparatus implementing the method also described. The method in particular includes cyclically measuring, at a pre-set sampling period, an overall time interval by starting at the beginning of the measuring of the overall time interval when a first variation peak of the electromagnetic field is sensed and terminating the measuring of the overall time interval when a last variation peak of the electromagnetic field is sensed. The first and the last peaks are the start and tail ends of a sequence of peaks having a predetermined number of successive peaks, the number of peaks being positive, whole, at least equal to six and a least common multiple of two and three.

The invention relates to a method for commissioning a sensor unit (16), comprising an acceleration sensor and / or tilt sensor, which is / are connected to a motion unit (10) in any mounting orientation, and wherein the method comprises the following commissioning steps to perform a translational axis calibration of a sensor coordinate system (x1, y1), (x3, y3): performing a translational movement of the motion unit (10), acquiring the acceleration and / or rotational velocity values ​​occurring during the translational movement in order to determine a motion vector (x2, y2), (x4, y4), teaching in a correction factor to transform an axis of the original sensor coordinate system (x1, y1), (x3, y3) in the direction of the determined motion vector (x2, y2), (x4, y4).

The invention discloses a system for observing dynamic target feature establishment by a dynamic platform, which comprises the following steps of: calculating a target relative projection speed according to target detection results of front and back frames; and target absolute projection speed: calculating the target absolute projection speed according to the target relative projection speed and the rotation speed of the observation platform. Calculating the length of a straight line segment which passes through the center position of the target and intersects with the target detection frame; the VRS characteristic value is obtained according to the calculated target projection body length and the calculated target absolute projection speed. The physical significance of the VRS characteristic value based on the target motion characteristic and the morphological characteristic is that the target moving distance in unit time is a multiple of the target body length, different types of moving targets can be effectively distinguished, and in the field of air specific type small target detection, target detection results are further screened by calculating the characteristic value, so that the target detection accuracy is improved. And the reliability of detection results is ensured.

The invention discloses a detection method, system and device suitable for the abnormal operation state of a pump. The method comprises the steps that at least three pieces of first data corresponding to the abnormal operation state detection of the pump are obtained in real time; wherein the first data is rotating speed data of pump operation; generating second data corresponding to the first data in real time based on the first data; wherein the second data is pulse signal data corresponding to the pump operation rotating speed data; according to the second data, whether the pump runs in an abnormal state or not is judged in real time, and third data corresponding to the second data is generated; wherein the third data is early warning data of the running state of the pump, and the system and the device corresponding to the method adopt a high-speed signal detection and wheel disc time difference calculation method to judge the rotating direction and the rotating speed of the pump and provide abnormal state detection data of the pump for unmanned operation of the pump.

The present invention discloses a method for laser processing of a rotating body surface. The method comprises installing a galvanometer on a three-dimensional motion mechanism, and setting a rotating body to be processed on the rotating mechanism; configuring laser processing parameters, and importing a model of the rotating body to be processed; calibrating the spatial position relationship between the three-dimensional motion mechanism, the galvanometer and the rotating body to be processed, and correcting the galvanometer; planning the laser processing trajectory of the galvanometer and the motion trajectory of the three-dimensional motion mechanism; starting the rotating mechanism to make the rotating body to be processed in a rotating state, and collecting the rotation speed and position of the rotating body to be processed, and moving the center of the galvanometer to the starting position of the laser processing by controlling the three-dimensional motion mechanism, and then performing laser processing. The present invention ensures that the laser beam can accurately follow the surface of the rotating body to be processed for processing by real-time monitoring of the position of the laser beam and the rotation speed of the rotating body workpiece, thereby improving the processing accuracy and processing efficiency.

An image forming apparatus includes a polygon mirror configured to deflect a laser beam toward a photoconductor and a polygon mirror motor configured to rotate the polygon mirror. A controller acquires a measurement of a spin up time taken for a rotation speed of the polygon mirror motor to reach a target rotation speed range. The controller determines whether the spin up time is between (a) a first threshold time predefined based on a period of time required for the rotation speed of the polygon mirror motor to reach the target rotation speed range and (b) a second threshold time predefined as a period of time indicating that the polygon mirror motor is broken. The controller stores history data regarding the spin up time in response to a determination that the spin up time is between the first threshold time and the second threshold time.

To reduce the effects of bias error superposition in gyro sensors and the effects of unexpected disturbances, to estimate an SF error of the gyro sensors in real time, robustly, and with high accuracy, and to calculate attitude information of a moving body in real time, robustly, and with high accuracy.SOLUTION: An SF error estimation unit 4 subtracts a calculated value ra (close to a true value ωtrue) of a "rotation speed" of a moving body using observation information of GNSS receivers R1 to R3, from a calculated value rgyro (which deviates from the true value ωtrue) of a "rotation speed" of the moving body using angular velocity information ωgyro of a gyro sensor G, to estimate an SF error rωtrue of the gyro sensor G. A process noise adjustment unit 5 adjusts a "process noise" of a state equation of a state space model related to attitude information "a" of the moving body to be larger or smaller, as a square value of the estimated SF error rωtrue of the gyro sensor G is larger or smaller, respectively.SELECTED DRAWING: Figure 4

A resolver-to-digital converter, comprising: a feedback (FB) filter chain loop having a state observer configured to estimate a rotation speed and a rotation angle of an object, based on a pair of input sine and cosine signals that are amplitude-modulated (AM) to correspond with the rotation angle of the object; and a feedforward (FF) filter chain path configured to estimate the rotation speed of the object based on the pair of input sine and cosine signals, wherein the state observer of the FB filter chain loop is further configured to offset the estimated rotation speed of the FB filter chain loop with the estimated rotation speed of the FF filter chain path to decrease a settling time of the estimated rotation angle.

An apparatus is described that determines an estimated rotational speed of a rotating component of a machine in the absence of a reliable tachometer signal to indicate an actual rotational speed. The apparatus includes a processor that determines a range of rotational speeds for the machine based on historical data, generates a vibration spectrum based on measured digital vibration data, identifies vibration peaks in the spectrum, determines a maximum peak amplitude of the vibration peaks, determines candidate frequency values within the range of rotational speeds, for multiple harmonics identifies a nearest peak within a spectral peak frequency tolerance of each harmonic, determines an error value based on a difference between the candidate frequency value and the nearest peak frequency value, determines an error sum value for each candidate frequency value, which is an iterative sum of the error values determined for the harmonics, determines the estimated rotational speed of the machine based on the candidate frequency value having a largest error sum value, and analyzes the digital vibration data using the estimated rotational speed of the machine to determine an operational characteristic of the machine.

The application provides an image acquisition method and device, a terminal device and a computer readable storage medium. The method comprises: acquiring a speed deviation of a second carrier, the speed deviation being an angular velocity of the second carrier relative to a rotating object; determining a target angular velocity of a first carrier according to the speed deviation and a preset initial motion speed of the second carrier; adjusting a current angular velocity of the first carrier to the target angular velocity, and controlling an image sensor to acquire an image of the rotating object. The image acquisition method provided by the application can acquire the speed deviation of the second carrier carrying the first carrier, thereby adjusting the rotating speed of the first carrier, so that the image sensor carried on the first carrier can work at a stable rotating speed, and the quality of the acquired image is improved.

A system for measuring the difference between a property of a first target and a property of a second target, the system comprising a first member and a second member, wherein the first member comprises a first pattern, and the speed of rotation of the first member is configured to be based on the property of the first target; and the second member comprises a second pattern wherein, the speed of rotation of the second member is configured to be based on the property of the second target, further wherein the first and second pattern are angularly-varying and are configured to generate an interference pattern by their interaction when the first and second members have a relative difference in their rotational speeds, the interference pattern being indicative of the magnitude of this difference.

A method, system, medium and product for estimating the rolling angle of a rotating guided projectile, which relates to the field of projectile guidance and control. By adopting the above technical solutions, first, the guidance and control system collects the rotation speed signal and the speed change signal after the rotating guided projectile exits the muzzle, and then constructs an accurate kinematic equation set. Secondly, after separating the basic rotation speed component and the fluctuating rotation speed component, the guidance and control system combines them to obtain the actual rotation speed value, and obtains the estimated rotation speed value by constructing a state prediction equation, and then obtains the observation error value. Then, the guidance and control system calculates the Mahalanobis distance based on the observation error value, the error covariance matrix and the measurement noise covariance matrix, and determines the weight coefficient to obtain the filtered rotation speed sequence. Finally, the guidance and control system performs numerical integration on the filtered rotation speed sequence in a preset time interval to obtain the final rolling angle estimation value. Thus, the instantaneous rolling angle of the rotating guided projectile during flight can be accurately estimated.

The application discloses a level environment self-adaptive error compensation algorithm method and device, belongs to the technical field of surveying and mapping services; for solving the problem of measurement jump, lag and overshoot caused by coupling of rotation speed change and angle switching under dynamic working condition. The method comprises the following steps: collecting angular velocity and angle switching data in real time; preprocessing and extracting speed change trend and switching time sequence; constructing a segmented adjustable response characteristic mapping based on double driving variables; combining historical deviation distribution and deviation mode characteristics to correct and fuse the initial compensation value; confirming the effectiveness of the compensation parameters through simulation verification; generating compensation instructions synchronized with the response of intelligent sensors by using time alignment mechanism; finally realizing closed-loop parameter updating based on feedback. The application adaptively adjusts the compensation parameters by sensing the speed change and switching action, significantly improving the measurement continuity, stability and overall accuracy of the level in the dynamic environment.

When the absolute value (|Tt−Tc|) of the difference between the turning time Tt of a log PW and the transport time Tc of the log PW is longer than a reference measurement time Ts, the turning-axis center line measurement time Tm is set to the absolute value (|Tt−Tc|) (Step S120), the rotation speed W of centering spindles 24a and 24b is set to a speed (Ws×Ts / Tm) lower than a reference rotation speed Ws, and also the measurement rotation angle α is set to an angle (αs×Ts / Tm) smaller than a reference measurement rotation angle as (Step S122). When the absolute value (|Tt−Tc|) is equal to or less than the reference measurement time Ts, the turning-axis center line measurement time Tm is set to the reference measurement time Ts (Step S116), the rotation speed W of the centering spindles 24a and 24b is set to the reference rotation speed Ws, and also the measurement rotation angle α is set to the reference measurement rotation angle αs (Step S118).

The invention discloses an ISAR (Inverse Synthetic Aperture Radar) image rotation speed estimation method based on sequence continuity, which depends on a SeqFormer network architecture and is combined with a decomposable instance query mechanism and a cross-frame feature modeling strategy to fully mine rotation consistency and geometric relevance between adjacent frames. According to the method, the rotation dynamic constraint is established among multiple frames of images, so that unified modeling and accurate analysis of continuous rotation features of the target are realized. In the feature extraction stage, a cross-frame feature interaction and fusion mechanism is utilized, the problem of local structure discontinuity caused by noise and shielding is effectively weakened, the morphological integrity of a target in a time sequence is kept, and stable geometric support is provided for rotation estimation. Furthermore, modeling and regression learning are carried out on rotation difference features between adjacent frames, the network can directly output the rotation speed of the target, the complex process depending on calibration or key point matching in a traditional method is avoided, and estimation precision and stability are remarkably improved.

The present invention discloses a non-contact rotating device and a method for preparing a modulator. The non-contact rotating device of the present invention includes an ultrasonic transducer and a modulator, wherein the ultrasonic transducer is used to generate a plane wave; the modulator is arranged on the propagation path of the plane wave and is located between the ultrasonic transducer and the target object; wherein the modulator can cause the plane wave passing through the modulator to produce a phase difference, so as to form a vortex sound field with multi-order topological charges, and the vortex sound field can drive the target object to rotate. The non-contact rotating device has a relatively simple structure and the overall device cost is relatively low, and can be widely used in experimental systems or industrial manufacturing. It can also generate an acoustic vortex field with multi-order topological charges, and the rotation speed of the object can be controlled by adjusting the distance between the modulator and the target object, which is more conducive to the operator selecting an acoustic vortex field of appropriate order according to needs and applying it to the target object, and is more flexible to operate.

TITLE: Method for Managing Optically Pumped Rotational Speed ​​Sensors. Method for managing a sensor device (10) having a vapor cell (20) containing an alkali vapor and a noble gas. The alkali vapor and the noble gas are excited by a pulsed laser (13), and a static magnetic field (B0), oriented in the z direction, and an oscillating magnetic field (Bx), oriented in the x direction, are applied to the vapor cell (20). Measurement beams from a source (30), installed with a detector (31) in a transparent device, are applied. Using the intensity variation determined by the detector (30), a measurement frequency, for example, a Larmor frequency, is determined. The intensity of the static magnetic field (B0) is varied by a control loop (41). Figure 2b

To achieve functional redundancy in a high-resolution magnetic encoder detecting the absolute angular position in multiple rotations, to avoid a situation where a failure cannot be detected and correct angle information cannot be output.SOLUTION: A magnetic encoder 1A performs cross-check processing of verifying whether first multi-rotation information and second multi-rotation information are normal in which a first multi-rotation sensor unit 20A and a second multi-rotation sensor unit 20B correspond respectively to the cumulative rotation number. The magnetic encoder performs cross-check processing of verifying whether a first one-revolution angle and a second one-revolution angle are normal in which a first one-revolution sensor unit 40A and a second one-revolution sensor unit 40B are respectively at an angular position within a range of one revolution. After the verification, the magnetic encoder integrates all the multi-rotation information and one-revolution angles to calculate the absolute angular position in multiple rotation.SELECTED DRAWING: Figure 1