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232 results about "Rotation error" patented technology
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The B-component in the A-axis read- ing is rotation error. Rotation error is the cross-axis component in a reading. Rotation error is responsible for the apparent displacements in the graph at right. Rotation errors become important when two conditions combine:
Wearable exoskeleton lower limb rehabilitation robot
InactiveCN102327173AImprove fitReduce the burden onGymnastic exercisingChiropractic devicesThighKnee Joint
The invention provides a wearable exoskeleton lower limb rehabilitation robot, which comprises a foot exoskeleton, an ankle exoskeleton, a shank exoskeleton, a knee exoskeleton, a thigh exoskeleton, a hip joint exoskeleton and a waist exoskeleton, wherein the ankle exoskeleton is connected with the foot exoskeleton, the shank exoskeleton is connected with the ankle exoskeleton, the knee exoskeleton is connected with the shank exoskeleton, the thigh exoskeleton is connected with the knee exoskeleton, the hip joint exoskeleton is connected with the thigh exoskeleton, and the waist exoskeleton is connected with the hip joint exoskeleton. A harmonic speed reducer is used to drive, a disc type electric machine is utilized, so the zero rotation error as well as the well fit between the drive and the joints of patients are realized, the wearable exoskeleton lower limb rehabilitation robot can be driven by a battery which is fixed at the back of the patients, so the problem of the limit movement range of the traditional rehabilitation devices is solved, and the invention has the characteristic of portability.
Owner:SHANGHAI JIAO TONG UNIV +1
Correction of patient rotation errors in radiotherapy using couch translation
ActiveUS7302038B2Undesirable changeMaterial analysis using wave/particle radiationRadiation/particle handlingRadiation therapyRotation error
Owner:TOMOTHERAPY INC +1
Multi-Axis Chip-Scale MEMS Inertial Measurement Unit (IMU) Based on Frequency Modulation
ActiveUS20140208823A1Ultra-high precisionUltra-high stabilityTesting/calibration of speed/acceleration/shock measurement devicesGyroscopes/turn-sensitive devicesGyroscopeAccelerometer
A multi-axis microelectromechanical-systems (MEMS) inertial measurement unit (IMU) is fabricated in a vacuum sealed single packaged device. An FM vibratory gyroscope and an FM resonant accelerometer both for generating FM output signals is fabricated in the silicon chip using MEMS. A signal processor is coupled to the an FM vibratory gyroscope and to the FM resonant accelerometer for receiving the FM gyroscopic output signals and the FM accelerometer output signals. The signal processor generates simultaneous and decoupled measurement of input acceleration, in put rotation rate, and temperature and / or temperature distribution within the IMU, self-calibration of the biases and scale factors of the IMU and its support electronics against temperature variations and other common mode errors, and reduction of the cross axis sensitivity by reducing acceleration errors in the gyroscope and rotation errors in the accelerometer.
Owner:RGT UNIV OF CALIFORNIA
Spherical calibration and reference alignment algorithms
InactiveUS7930148B1Improve accuracyGain and offset errorSurveyAmplifier modifications to reduce noise influenceEllipseReference device
Inclinometer and directional field sensor readings can have gain, offset, and non-orthogonality errors, as well as reference alignment rotation errors. When a series of readings are taken by a three axis sensor with a variety of different orientations, the resulting dataset looks like a perfect hypothetical sphere in the absence of any errors; with errors as mentioned above the dataset looks like an offset, rotated, ellipsoidal quadratic surface. This invention provides a simple method of removing the above errors from a tilt reference device. A disclosed algorithm is divided into two distinct components: the ellipsoidal quadratic surface component, which covers gain, offset, and axis misalignment; and the rotation component, which covers rotation relative to a set of reference axes. The solution presented here addresses both components combined, or separated and for inclinometers, magnetometers and rate sensors.
Owner:P&I
Exoskeleton wearable upper limb rehabilitation robot
The invention provides an exoskeleton wearable upper limb rehabilitation robot, which comprises a shoulder joint exoskeleton, an elbow joint exoskeleton, a wrist joint exoskeleton and a hand exoskeleton, wherein the shoulder joint exoskeleton has two degrees of freedom; the elbow joint exoskeleton has two degrees of freedom; the wrist joint exoskeleton has one degree of freedom; and the hand exoskeleton has three degrees of freedom, namely the robot have eight degrees of freedom. The exoskeleton wearable upper limb rehabilitation robot is driven by using a harmonic wave speed reducer and a disc type motor serving as a high-power motor to realize zero-rotation error and the good fit of driving and joints of patients. The exoskeleton wearable upper limb rehabilitation robot can be driven by a storage battery, the problem of limit of activity range in the conventional rehabilitation device is solved, and the robot is portable.
Owner:合肥中科类脑智能技术有限公司
Laser heterodyne interference linearity measuring device and laser heterodyne interference linearity measuring method with six-degree-of-freedom detection
ActiveCN104634283AAchieving Simultaneous DetectionEasy to detectUsing optical meansBeam splitterMeasurement device
The invention discloses a laser heterodyne interference linearity measuring device and a laser heterodyne interference linearity measuring method with six-degree-of-freedom detection. The laser heterodyne interference linearity measuring device comprises a laser heterodyne interference linearity and position detection part and an error detection and compensation part; a four-degree-of-freedom error detection light path consisting of three ordinary beam splitters, a polarizing beam splitter, a plane reflecting mirror, a convex lens, a position sensitive detector and two four-quadrant detectors is additionally arranged in a light path structure of the laser heterodyne interference linearity and position detection part. By utilizing a method for integrating the laser heterodyne interferometry and a laser spot detection method, the simultaneous six-degree-of-freedom detection of a deflection angle, a pitch angle, a rolling angle, horizontal linearity, vertical linearity and linearity position of a measured object can be realized, the error compensation is carried out for the vertical linearity and the vertical linearity position, the influence of rotation error of the measured object on a measurement result in the linearity measuring process can be eliminated, and the measurement precision of the laser heterodyne interference linearity and the position of the laser heterodyne interference linearity can be improved.
Owner:ZHEJIANG SCI-TECH UNIV
Polarization Beam Splitter-Polarization Rotator Structure
ActiveUS20080019637A1Easy to adaptCoupling light guidesNon-linear opticsLight beamPolarization beam splitter
A polarization beam splitter-polarization rotator-polarization beam combiner optical structure comprising a pair of polarization rotators having a polarization beam splitter associated with the input ends of the two polarization rotators, and a polarization beam combiner associated with output ends of the two polarization rotators, and a method of purifying a light signal comprising TE and TM modes by disassociating the primary TE and TM modes from first order splitter and rotation error components.
Owner:INFINERA CORP
Method for calibrating in-orbit exterior orientation parameters of push-broom optical cameras of remote sensing satellite linear arrays
ActiveCN103679711AMeet the needs of on-orbit geometry calibrationImprove accuracyImage analysisMathematical modelOrbit
The invention discloses a method for calibrating in-orbit exterior orientation parameters of push-broom optical cameras of remote sensing satellite linear arrays. The method includes steps of (1), acquiring information of high-precision control points; (2), acquiring interior orientation elements of the cameras at the control points, acquiring auxiliary data of orbits and the like and building rigorous imaging geometric models of various control points; (3), computing positioning errors of the various control points, eliminating coarse and poor control points and acquiring information of preliminarily calibrated control points; (4), building geometric calibration mathematical models of exterior orientation elements of the cameras, and computing theoretical pointing vectors and actual pointing vectors of the various control points; (5), creating three-axis rotation error equations among the theoretical pointing vectors and the actual pointing vectors and linearly processing the equations; (6), solving parameters of the error equations by a least square process to acquire calibration exterior parameters. The method has the advantage that after errors of a system are compensated by the aid of the calibration exterior parameters, the cameras are stable in non-control positioning precision.
Owner:SPACE STAR TECH CO LTD
Image warping correction in forming 360 degree panoramic images
ActiveUS7400782B2Color signal processing circuitsGeometric image transformationRotational axisImage warping
A method for creating a 360 degree panoramic image from multiple images includes (1) computing a gross rotation error ΔR between a first image and a calculated first image rotated to be stitched to a last image, and (2) spreading the gross rotation error ΔR to each pixel on the panoramic image. Spreading the gross rotation error ΔR includes (1) computing a rotation angle θ0 and rotational axis n0 from the gross rotational error ΔR, (2) determining an angle α of each pixel, and (3) determining a compensation matrix Rc for each pixel using the following formula: Rc(α)=R(α / 2πθ0). Spreading the gross rotation error ΔR further includes (4) tracing a pixel on the panoramic image to a camera optical center of the images to form a first ray, (5) determining a second ray originating from the camera optical center that would be rotated by the compensation matrix Rc to coincide with the first ray, (6) tracing the second ray to a second pixel on one of the images, and (7) painting the first pixel with color values of the second pixel.
Owner:ARCSOFT
Online monitoring device for radial rotation accuracy of main shaft
ActiveCN102501137AReal-time online monitoringAccurate rotation accuracyMeasurement/indication equipmentsSeparation technologyData acquisition
An online monitoring device for the radial rotation accuracy of a main shaft is disclosed, wherein a monitoring ring is installed at the radial measuring position of the main shaft; three eddy-current displacement sensors are installed on the monitoring ring; the proximitors of the eddy-current displacement sensors are connected with the terminal board of a data acquisition board card; the data acquisition board card is connected to an industrial computer via a PCI (peripheral component interconnection) slot; when the main shaft is in a rotating state, the eddy-current displacement sensors convert the measured voltage signal to a standard voltage signal via the proximitors; the analog signal is converted to a digital signal via a signal conditioning circuit module and an A / D (analog / digital) conversion module on the data acquisition board card, and then the digital signal enters into the industrial computer; the radial displacement signal of the main shaft is obtained by signal acquisition and analysis software; the roundness error of the main shaft is separated out by applying a three-point error separation technology, thereby obtaining the rotation error of the main shaft; and finally the analysis result of the rotation accuracy of the main shaft is displayed. The online monitoring device for the radial rotation accuracy of a main shaft has the advantages of being high in accuracy and convenient in adjustment.
Owner:XI AN JIAOTONG UNIV +1
Method for detecting position of automobile meter needle based on mechanical angle and scale identification
The invention discloses a method for detecting the position of an automobile meter needle based on a mechanical angle and scale identification and relates to a needle position detection method. The method mainly solves the problems that a needle deforms when being detected in a small angle with a traditional method; dependency on the zero scale is high, so that the orderly scale sequence can not be obtained due to inaccuracy of scale distribution features; rotation errors generated when an instrument panel is assembled will not be detected with the traditional method. The method for detecting the position of the automobile meter needle based on the mechanical angle and the scale identification includes the following steps that firstly, the rotation angle of a single-frame gray level image is calculated; secondly, a single-frame binary image is normalized, binarized and then corroded; thirdly, polar coordinate conversion is carried out on the image; fourthly, parameters of a needle linear equation are obtained; fifthly, the mechanical angle of the needle is calculated; sixthly, the scale value pointed by the needle is calculated out; seventhly, the value of a practical unit is obtained. The method for detecting the position of the automobile meter needle based on the mechanical angle and the scale identification is applied to the needle position detection field.
Owner:HARBIN INST OF TECH
Apparatus, method and medium displaying stereo image
InactiveUS20070189599A1Compensating for such errorCharacter and pattern recognitionSteroscopic systemsGraphicsStereo image
An apparatus, method, and medium displaying a stereo image compensates for errors between a left image and a right image to reduce eye fatigue experienced by a user. The apparatus includes a feature-point extractor to extract feature points of graphics objects included in a left image and a right image, of a stereo image, a representative-vector determiner to determine a representative vector among vectors between a predetermined point and the feature points, an error-correction unit to correct at least one of a vertical error and a rotation error between the left image and the right image using a difference between the representative vector determined in the left image and the representative vector determined in the right image, and a display unit to display the left image and the right image for which at least one of the vertical error and the rotation error has been corrected.
Owner:SAMSUNG ELECTRONICS CO LTD
Correction of patient rotation errors in radiotherapy using couch translation
ActiveUS20060072699A1Undesirable changeMaterial analysis using wave/particle radiationRadiation/particle handlingRadiation therapyRotation error
Owner:TOMOTHERAPY INC +1
Pattern inspection apparatus, corrected image generation method, and computer-readable recording medium storing program
A pattern inspection apparatus includes a first unit configured to acquire an optical image of a target workpiece to be inspected, a second unit configured to generate a reference image to be compared, a third unit configured, by using a mathematical model in which a parallel shift amount, an expansion and contraction error coefficient, a rotation error coefficient, a gray-level offset and an image transmission loss ratio are parameters, to calculate each of the parameters by a least-squares method, a forth unit configured to generate a corrected image by shifting a position of the reference image by a displacement amount, based on the each of the parameters, and a fifth unit configured to compare the corrected image with the optical image.
Owner:KIOXIA CORP +1
Precise main shaft rotation accuracy detecting device and method
ActiveCN103759941AHigh precisionEasy to operateMachine gearing/transmission testingRotation errorAxial rotation
The invention relates to a precise main shaft rotation accuracy detecting device and method, and belongs to the technical field of measuring precise main shaft rotation errors. The detecting device comprises an atomic force microscope (AFM), a plane sample, a manual two-dimensional adjusting platform, a two-dimensional electric displacement platform and a precise main shaft controller, wherein the AFM is used in cooperation with the plane sample to obtain a scored morphology graph, the plane sample is fixed to the upper portion of the manual two-dimensional adjusting platform, the bottom of the manual two-dimensional adjusting platform is connected with the upper end of a precise main shaft to be detected, and the lower end of the precise main shaft to be detected is connected with the two-dimensional electric displacement platform. The detecting device and method use the advantage of nanometer scoring machining and detecting integration of the AFM, it is unnecessary to adopt a datum part in the detecting process, operation is easy, the measurement accuracy can reach the nanometer order, radial and axial rotation errors of the precise main shaft can be detected at the same time, and the accuracy of the rotation errors of the precise main shaft is improved.
Owner:HARBIN INST OF TECH
Profile measuring instrument
A coordinate measuring machine includes a probe having a measurement unit, a movement mechanism for moving the probe and a host computer for controlling the movement mechanism. The host computer includes: a compensation-amount calculating unit for calculating a compensation amount for compensating an error in the position of the measurement unit caused by the movement of the probe; and a compensator for compensating the error in the position of the measurement unit based on the compensation amount calculated by the compensation-amount calculating unit. The compensation-amount calculating unit calculates a translation-compensation amount for compensating a translation error of the probe and a rotation-compensation amount for compensating a rotation error of the probe based on a rotation frequency of the movement of the probe.
Owner:MITUTOYO CORP
Apparatus, system, and method for detecting fan rotation direction in electronic devices
InactiveUS20090190625A1Cost-effective detectionPump componentsDigital data processing detailsEngineeringElectric devices
An apparatus, system, and method are disclosed for determining fan rotation direction. A first temperature detection module detects a first temperature at a first location between a fan and a heat generating device. The fan provides cooling for the heat generating device by drawing air from the heat generating device across the first location to the fan when the fan is rotating in a first direction. A second temperature detection module detects a second temperature at a second location where the heat generating device is between the second location and the fan such that heat from the heat generating device is drawn away from the second location when the fan is rotating in the first direction. A temperature comparison module determines if the second temperature is above the first temperature. A fan rotation error module generates a fan rotation error signal if the second temperature is above the first temperature.
Owner:IBM CORP
Turntable error detection method based on multi-station etalon laser tracking system
ActiveCN106441117AMeet the test requirementsAvoid perturbation errorUsing optical meansNumerical controlFast measurement
The invention relates to a turntable error detection method based on a multi-station etalon laser tracking system. When measurement is carried out, a laser tracker is arranged at a fixed position according to certain layout, and the center of the laser tracker is defined as a base station position. A mirror is arranged on a turntable, and rotates with the turntable. According to the method, the mirror measures the turntable movement at different positions; the distance between each measurement point to the base station is used to determine the spatial position coordinate of the base station and each measured point through a BFGS optimization algorithm; the difference between the actual coordinate and the theoretical coordinate of each measured point is used to determine the spatial error of each measured point; an error separation equation is established through the transformation of a spatial right angle coordinate system; and six errors of the turntable are acquired by solving the equation. The method has the advantages of high precision and fast measurement, and is suitable for the rapid detection of turntable rotation errors of a numerical control machine tool.
Owner:XI AN JIAOTONG UNIV
Numerical controller for multi-axis machine
ActiveUS20120001583A1High precision machiningComputer controlTemperatue controlTranslation errorMulti axis
A numerical controller for controlling a multi-axis machine calculates an axis-dependent translation error amount and an axis-dependent rotation error amount based on a command axis position. Translation and rotation compensation amounts are calculated based on the axis dependent translation and rotation error amounts, respectively. The translation and rotation compensation amounts are added to command linear and rotary axis positions, respectively. Three linear axes and three rotary axes are driven to the added positions, individually. Thus, there is provided a numerical controller that enables even machining with a side face of a tool or boring to be in commanded tool position and posture (orientation) in the multi-axis machine.
Owner:FANUC LTD
Whole machine magnetometer calibration method applied to micro unmanned plane
ActiveCN104613983AImprove engineering applicabilityHigh degree of integrationMeasurement devicesRotation errorMagnetometer
The invention provides a whole machine magnetometer calibration method applied to a micro unmanned plane. The method comprises the following steps: integrating outside hard magnetic interference with null bias errors of a magnetometer, integrating outside soft magnetic interference with sensitivity errors of the magnetometer, carrying out ellipsoid fitting calculation on magnetic interference errors and magnetometer sensor errors, calculating a rotary error matrix of mounting errors by combining with the attitude information of the micro unmanned plane according to a calculation result; and finally calculating calibration parameters of the magnetometer under the condition with the whole micro unmanned plane according to simultaneous error parameters. The calibration parameters of the magnetometer are integrated with environment magnetic interference parameters, sensor error parameters and mounting error parameters. The method has the characteristics of high integration degree, high engineering applicability and high calibration accuracy.
Owner:航天时代飞鸿技术有限公司
Morphology registration analysis-based method for detecting precision of precise main shaft rotation
ActiveCN102252617AHigh precision requirementsRealize measurementMeasurement/indication equipmentsUsing optical meansThree dimensional morphologyControl system
The invention provides a morphology registration analysis-based method for detecting precision of precise main shaft rotation. A surface sample is installed on a to-be-detected precise main shaft; a control system controls the to-be-detected precise main shaft to be at a position at an angle theta; surface morphology graphs of the surface sample are collected in order, wherein the surface morphology graphs are obtained when the to-be-detected precise main shaft at complete circumference positions. A morphology data registration analysis processing system analyzes the plurality of surface morphology graphs and error evaluation is simultaneously carried out. According to the invention, a morphology of a surface sample that makes rotation with a precise main shaft is measured and subsequent morphology registration is analyzed and processed; there is no high precision requirement on the surface sample; and an expensive standard external circle profile or a complex testing system and a testing process are not needed. If a two-dimensional morphology / image sensor is selected for utilization, a radial rotation error of the main shaft can be measured; If a three-dimensional morphology measurement sensor is selected for usage, radial and axial rotation errors of the main shaft can be measured simultaneously. The utilization of a measurement sensor with high resolution enables main shaftrotation error detection with nanometer-level precision to be realized.
Owner:HARBIN INST OF TECH
Optical measurement method and optical measurement device for five-degree-of-freedom rotation errors of spindle
InactiveCN102322795AImprove stabilityHigh resolutionUsing optical meansLight spotOptical measurements
The invention discloses an optical measurement method and an optical measurement device for the five-degree-of-freedom rotation errors of a spindle. The optical measurement device comprises a precision-turned flange, four point laser generators, four CCD (Charge Coupled Device) cameras (CCD for short) and other fittings, wherein the flange is mounted on the end of the measured spindle. In the process of measurement, the flange is rotated along with the measured spindle, the four point laser generators emit four laser beams into the conical surface of the flange, and the laser beams are reflected by the conical surface and are then projected onto the four CCDs. When the spindle does not have rotation errors, the position of the light spot on each CCD is at the center of the CCD; and when the spindle has rotation errors, the positions of the light spots on the CCDs are changed. By capturing and subsequently processing the positions of the laser on the CCDs, the invention can measure theradial play (Delta x, Delta y) and axial play (Delta z) of the spindle and the deflection errors (Epsilon x, Epsilon y) of the spindle around the X axis and the Y axis. The method has a simple structure, the equipment cost is low, and the invention can carry out non-contact on-line measurement on the five-degree-of-freedom rotation errors of the spindle, and has higher measurement speed.
Owner:ZHEJIANG UNIV
High-accuracy roundness detection method based on combination of reverse and multi-sensor methods
Owner:DONGHUA UNIV
In-place measuring device and measuring method for separated electricity jumpiness of main shaft rotation error
ActiveCN103213033AAvoid influenceHigh measurement accuracyMeasurement/indication equipmentsUsing electrical meansElectricityMeasurement device
The invention provides an in-place measuring device and an in-place measuring method for electricity jumpiness of a main shaft rotation error. A laser displacement sensor, a first electrical vertex sensor and a second electrical vertex sensor are arranged outside a measured axisymmetric body, the first electrical vertex sensor, the second electrical vertex sensor and the laser displacement sensor arranged on the same circle, and the circle and the measure axisymmetric body are coaxial. An angle sensor is arranged in an axial position of the second electrical vertex sensor in a close mode. All the sensors are connected with a control module, the control module outputs a signal to an acquisition module, and the acquisition module is then connected with a host machine. According to the in-place measuring method for the electricity jumpiness of the main shaft rotation error, all the sensors are enabled to be in proper positions through regulating devices, when the axisymmetric body is measured, the axisymmetric body rotates, the rotating speed stays the same, measurement parameters are set in measuring software, the sensors start measurement and data acquisition, a computer analyzes and treats the data which are transmitted in, finally, measurement and treatment results are output.
Owner:HANGZHOU STEAM TURBINE
Sensor mounting adjustment system and laser leveling reference device
ActiveCN105223969AImprove efficiencyHigh precisionControl using feedbackMultiple sensorReference device
The invention relates to a sensor mounting adjustment system and a laser leveling reference device. The sensor mounting adjustment system comprises at least three sensor mounting adjustment devices and a laser leveling reference device for mounting a laser. Each sensor mounting adjustment device is provided with a height adjustment part for adjusting level of a sensor fixing seat and a level alignment mechanism. The level alignment mechanism comprises a target positioning hole arranged on a front mounting plate and a target reticle arranged on a rear mounting plate. The connection line between the target positioning hole and the target reticle is arranged parallelly with the sensor. The laser leveling reference device of the invention is provided with at least three height adjustment parts arranged at intervals around the circumferential direction for adjusting level of the sensor fixing seat. According to the system and the device of the invention, horizontal coplane and concentric mounting of measurement axes of multiple sensors can be quickly realized, efficiency and precision of mounting and positioning of the sensor are improved, and the roundness error measurement precision and the rotation error measurement precision can be further ensured.
Owner:HENAN UNIV OF SCI & TECH
Numerical controller for multi-axis machine
ActiveUS8350514B2High precision machiningComputer controlSimulator controlTranslation errorMulti axis
A numerical controller for controlling a multi-axis machine calculates an axis-dependent translation error amount and an axis-dependent rotation error amount based on a command axis position. Translation and rotation compensation amounts are calculated based on the axis dependent translation and rotation error amounts, respectively. The translation and rotation compensation amounts are added to command linear and rotary axis positions, respectively. Three linear axes and three rotary axes are driven to the added positions, individually. Thus, there is provided a numerical controller that enables even machining with a side face of a tool or boring to be in commanded tool position and posture (orientation) in the multi-axis machine.
Owner:FANUC LTD
Test body for determining rotation errors of a rotating apparatus
ActiveCN105026885AAngles/taper measurementsUsing optical meansDegrees of freedomCoordinate-measuring machine
Test body (1; 100; 101; 102; 103; 104; 105) for determining one or more rotation errors of a rotating apparatus (2; 201), in particular a rotating apparatus for a coordinate measuring machine, with respect to one or more degrees of freedom of movement, in which a real rotating movement of the rotating apparatus (2; 201) differs from an ideal rotating movement, wherein the test body comprises: a holder (3, 300) which, together with a part of the rotating apparatus (2, 201), can be rotated about an axis of rotation (D; A; B) and which is configured to arrange or fasten the test body with respect to the axis of rotation about which the test body can be rotated for the purpose of determining the rotation error(s), and a plurality of test elements (5, 8, 9; 5, 10; 500, 501, 800; 500, 502, 800; 800, 900, 1000; 503) which are rigidly connected to the holder or are formed on the holder, wherein each of the test elements is used to determine the rotation error with respect to one or more of the degrees of freedom of movement.
Owner:CARL ZEISS IND MESSTECHN GMBH
Rolling bearing vibration detection device and analysis method
InactiveCN104251764AResponse vibration levelMachine bearings testingVibration testingRolling-element bearingEngineering
The invention relates to a rolling bearing vibration detection device. The rolling bearing vibration detection device comprises a bearing vibration measuring unit, a spindle rotation error measuring unit and a base, wherein the bearing vibration measuring unit and the spindle rotation error measuring unit are respectively and fixedly installed on the base and are located on the two sides of a spindle of a rolling bearing to be measured; the bearing vibration measuring unit comprises a contact-type vibration sensor and a three-dimensional micro-displacement platform, the contact-type vibration sensor is fixedly arranged on the three-dimensional micro-displacement platform, the three-dimensional micro-displacement platform is fixedly arranged on the base; and the contact-type vibration sensor can translate along the radial, axial and vertical direction of the rolling bearing to be measured; the spindle rotation error measuring unit comprises a displacement sensor and a two-dimensional micro-displacement platform, the displacement sensor is fixedly arranged on the two-dimensional micro-displacement platform, the two-dimensional micro-displacement platform is fixedly arranged on the base and the displacement sensor can translate along the radial and vertical direction of the rolling bearing to be measured. The invention further relates to a rolling bearing vibration analysis method.
Owner:TSINGHUA UNIV
A light field image rotation error correction method
ActiveCN109146794AReduce the amount of calculationReduce computing timeGeometric image transformationImaging processingReference image
A light field image rotation error correction method relates to the field of image processing, in order to solve the problems of large calculation amount, long time consuming, low precision of rotation angle solution and undesirable correction effect existing in the prior light field image rotation error correction method. The method comprises steps: acquiring the original white image of the lightfield; extracting a reference image; the reference image being initially divided into a plurality of micro-transmissive mirror images, and the coarse adjustment center region being determined; calculating a center coordinate of each micro-transparent mirror image; the image rotation angle being estimated by fitting the center coordinates linearly; the pixel points in the original image of the light field to be corrected being subjected to reverse rotation coordinate mapping and interpolation processing to obtain the corrected original image of the light field; the four-dimensional light fieldanalysis and digital refocusing being carried out on the target scene to obtain the refocused image; the pixel points in the refocused image being mapped and interpolated to obtain the corrected refocused image. The invention is suitable for correcting light field images.
Owner:HARBIN INST OF TECH
Coordinate measuring machine
ActiveUS20090287444A1Correction errorDigital computer detailsUsing electrical meansCoordinate-measuring machineTranslation error
A coordinate measuring machine includes: a probe provided with a measurement piece; a moving mechanism that effects a scanning movement of the probe; and a host computer for controlling the moving mechanism. The host computer includes a displacement acquiring unit for acquiring a displacement of the moving mechanism and a measurement value calculating unit for calculating a measurement value. The measurement value calculating unit includes a correction-amount calculating unit for calculating a correction amount for correcting a position error of the measurement piece and a correcting unit for correcting the position error of the measurement piece based on the displacement of the moving mechanism and the correction amount. The correction-amount calculating unit calculates a translation-correction amount for correcting a translation error of the probe at a reference point on the probe and a rotation-correction amount for correcting a rotation error of the probe according to a rotation angle of the probe around the reference point and a length of the probe from the reference point to the measurement piece.
Owner:MITUTOYO CORP
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