230 results about "Rotation error" patented technology

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.

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.

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.

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.

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.

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 R_c for each pixel using the following formula: R_c(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 R_c 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.

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.

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.

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.

Compensation for patient rotation between planning and treatment in a radiation therapy machine is provided by angled translation of a table surface on which the patient is supported without actual patient rotation.

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.

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.

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.

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.

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.

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.

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.

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.

The invention relates to a high-accuracy roundness detection method based on the combination of reverse and multi-sensor methods. The method comprises the following steps of: making two discs with the same shape error, taking one disc as a reference disc and rotating the other disc for 180 degrees coaxially, fixing the two discs mutually; arranging the fixed two discs on a testing platform of a roundness tester coaxially and enabling the circle centers of the two discs to be coincident with the rotation center of the roundness tester; and putting a detected workpiece on the discs and also enabling the circle center of the detected workpiece to be coincident with the rotation center of the roundness tester. In measurement, an inclined angle formed by two sensors connected with the discs is 180 degrees, workpiece shape errors in two paths of combined signals output by the sensors are same both in size and direction, and the rotation errors of a spindle are same in size and opposite in direction, therefore the rotation errors of the spindle can be separated out, and then the shape errors of the detected workpiece can be obtained, and the roundness of the detected workpiece can be obtained finally. By the method disclosed by the invention, the roundness of a workpiece can be measured accurately.

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.

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.

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.

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.

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.