105 results about "Error separation" patented technology

The invention relates to high-precision in-situ detection for complicated curved-surface parts with high-curvature surface form. In order to provide non-contact for the parts and detection for the surfaces of the parts, the invention provides the following technical scheme, namely a high-precision non-contact measurement method and a high-precision non-contact measurement device for a three-dimensional profile of an optical freeform curved surface. A grating projection device is used for projecting a sine grating stripe onto the surface of a measured object; an image acquisition device acquires a deformed stripe pattern modulated by the surface of the measured object and sends the deformed stripe pattern into a computer to recover the three-dimensional profile of the surface of the measured object; a white light scanning interference measuring head is used for scanning and measuring local characteristics of the measured object in nano-scale precision; a white light scanning image acquisition device acquires an interfered stripe pattern and sends the interfered stripe pattern into the computer to acquire data of the three-dimensional profile of a measurement region; and a result can be obtained according to data obtained by measurement of a grating projection vision detection unit and a white light scanning interference measurement unit through a multi-sensor massive data combination algorithm and corresponding error separation and compensation measures. The invention is mainly applied to the high-precision in-situ detection of the parts.

The invention relates to a nonspherical absolute measuring system based on a multiwave front lens compensator, which comprises a phase shifting interferometer, a standard lens, a multiwave front lens compensator, an electric control adjusting device and a driver thereof, a measured nonspherical optical element, a six-dimensional adjusting frame, an electric control translation platform and a drive thereof as well as a computer control and date processing system, wherein the multiwave front lens compensator comprises a plurality of optical elements or element groups. The invention realizes error separation by a plurality of interferometry for improving the surface shape detecting precision of the nonspherical optical element and has certain flexible measuring range and larger application value.

The invention discloses a roll angle measuring method based on a grating and a device thereof, which belongs to the technical field of photoelectric detection. A laser lases and emerges directly, or emerges after collimation through a collimating lens; the light is directly incident on a one-dimensional plane transmission grating, or reversely incident on the grating through a retrodirective reflector; plus-minus first stage diffracted light from the grating is focused to form two diffracted light points through a lens; a photodetector is used to detect the variations in positions of the two focused light points, thus figuring out a roll angle. The optical structure of the device is compact and simple, and brings convenience to practice; in addition, the accuracy, the stability and the economical efficiency are also high. The grating is used as a sensitive device; error separation is achieved, and the interference-free feature is improved by using the differential measurement of double diffracted beams; few optical devices are used; and the power of the light source is low; the cost is low; mobile parts do not require to be provided with cables; the angle measurement distinguishability is as high as 0.5 and even higher; different requirements of measurement accuracy can be met just by replacing the grating with gratings having different numbers of lines.

The present invention belongs to the field of precise instrument manufacture and measurement technology, and is especially self-separation method and device for spatial error of super-precise revolution reference. The method of Z-direction section-by-section separation of super-precise revolution reference spatial motion error can meet the requirement of high precision cylindricity instrument to reduce spatial revolution error. The self-separation device for spatial error of super-precise revolution reference is developed by means of integrating roundness error separating system and cylindricity instrument revolution main shaft system. The bench revolving single-transposition small-angle error separation method is adopted in realizing the section-by-section separation of spatial revolution motion error of cylindricity instrument revolution main shaft, so as to reach the aim of reducing the effect of the spatial revolution motion error on measurement result.

The invention discloses a detection method for the synchronization error between a translational motion shaft and a rotating shaft of a five-axis numerically-controlled machine tool. The detection method comprises the following steps that (1) a measurement range is determined, and a measurement trajectory NC program is calculated; (2) an evaluation index of the synchronization error between the rotating shaft and the translational motion shaft is determined; (3) a ball bar meter is installed, a tool tip rotating follow function of the five-axis machine tool is started, the measurement program is operated, and measurement data of the ball bar meter are obtained; (4) the current synchronization error between the rotating shaft and the translational motion shaft is worked out; and (5) the servo position proportional gain and speed feed-forward gain servo parameters of the measured rotating shaft and servo position proportional gain and speed feed-forward gain servo parameters of the measured translational motion shaft are adjusted according to the measured synchronization error situation, and then error measurement is conducted till the error reaches the precision requirement level of the machine tool. According to the detection method for the synchronization error between the translational motion shaft and the rotating shaft of the five-axis numerically-controlled machine tool, measurement of the synchronization error between the rotating shaft and the translational motion shaft can be achieved by simply measuring the movement path, operation is easy, error separation is clear, and efficient adjustment of the synchronization error is convenient.

The invention discloses a method and device for measuring main shaft rotary errors with the capacity of installation eccentricity separation. The device comprises a displacement sensor installation clamping device, a displacement sensor, a grating encoder, a signal cable, a data processor and a computer. According to the measurement process, measurement is conducted by the displacement sensor according to three selectable modes with three different positions of the external profile of a main shaft serving as sampling starting points, other components, except for first-order harmonic waves, of main shaft roundness errors are obtained on the basis of the three-point method principle, secondary separation is conducted according to the provided algorithm, installation eccentricity is separated from the rotary errors, and therefore a pure rotary movement error value of the main shaft is obtained. On one hand, the roundness errors of the profile of the main shaft and eccentric errors of installation of a standard ball and the sensor are separated from the rotary movement errors of the main shaft, so that the separation operand is small. On the other hand, only one displacement sensor is adopted and measurement errors caused by a sensor performance difference because of three sensors adopted in a common three-point method error separation technology are avoided.

The invention relates to an axial circular runout and total runout single displacement error separation device and method, and belongs to the technical field of micro-nanometer ultra-precise measurement. In the method, an axial circular runout and total runout measurement device and an error separation system are organically integrated into a whole, a proper displacement angle alpha is selected in an error separation process, so that a workpiece performs a single small-angle displacement of a corresponding angle relative to a rotary main shaft, total harmonic separation of z(n) and g(n) in a harmonic range of between 1 and 100upr by measuring comprehensive errors A(n) and B(n) including a workpiece axial circular runout error g(n) and a main shaft rotary error z(n) before and after displacement of the workpiece, and utilizing fast Fourier series transform, harmonic analysis and other mathematic processing methods. According to the device and the system, when an existing error separation method is used for circular runout error separation, the defects that an error introduced by a rotary shaft cannot be completely separated, error separation time is long, various larger drifts are easily introduced and the like can be overcome, and the error separation device and the error separation process can be greatly simplified.

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.

A double offset parameter circle contour measurement model and an offset error separation method belong to the technical field of surface shape measurement. The model simultaneously includes two offset error components: offset error of the detected component (e, Alpha) and offset error d of the measuring head of a sensor. The measurement model is that Rho i is equal to ecos(Theta i-Alpha)+((ro+Delta ri)<2>-(d+esin(Theta i - Alpha))<2>)<1 / 2>. The method of parameter optimization is adopted to realize accurate estimation and direct solving of offset error parameters and other parameters in the model, thus separating the offset parameters one by one from the measuring data and acquiring the actual circle contour of the detected piece. The measurement model provided by the invention can completely and accurately reflect the influence of the offset error parameters to the measurement of the circle contour and overcome the problems of principle defect and low parameter estimation accuracy existed in the generally used measurement model at the present time.

The present invention discloses a long and thin bore diameter and cylindricity measurement method based on dual-sensor error separation. A standard ring gauge is taken as a calibrating device to sleeve a dual-sensor measuring head, a first harmonic elimination approach method is employed to calibrate the dual-sensor measuring head, the dual-sensor measuring head is sleeved with the bore of a measured workpiece, the complete cycle scanning measurement is performed section by section along the axial direction and the circumferential direction of the bore, the distance measurement data of each section of the two sensors are employed to obtain average values and perform difference to realize calculation and separation of line feed errors of each section and the eccentricity error of each section is separated to convert the finally processed measurement data to a rectangular coordinate system and add the eccentricity error of the corresponding section in the data points of each section so as to restore the contour of the measured bore, the least square method is employed to obtain the diameter of the bore contour, and the cylindricity evaluation method is employed to perform cylindricity calculation. The long and thin bore diameter and cylindricity measurement method based on the dual-sensor error separation can realize calibration of an unidirectional electronic measurement head so as to effectively separate the line feed errors of a guide rail and the eccentricity error of each section of the bore of the workpiece so as to greatly improve the detection precision of the long and thin bore diameter and the cylindricity.

The invention discloses a measuring device of workpiece rotary table error separation based on double-probe scan data splicing and a method thereof. The device employs two sets of probe systems (1, 1') to carry out scanning measurement simultaneously on a swing arm contourgraph which is formed by a probe system (1), a transverse arm (2), a column (3), a counterweight (4), a standard flat crystal (5), a workpiece rotary table (6) and a transverse arm rotary table (7). After two sets of the probe systems scan one time, two scanning loci M1 are obtained, then the workpiece rotary table is rotated with a certain angle beta and scanning is carried out once more, and another two scanning loci M2 are obtained. According to the device and the method, a method of double-probe scan data splicing is employed, influence of a motion error of the workpiece rotary table on a measurement result can be effectively separated and removed, thus measurement precision is raised substantially, and a practical solution scheme is provided for on-position measurement of the swing arm contourgraph at an optical processing field.

The invention provides a method and a device for simultaneously measuring five degrees-of-freedom errors based on light beam drift compensation. The method and the device are used for solving the problems of low measurement precision, small measurement range and poor anti-interference capability of the existing high-precision simultaneous measurement method for guide rail five degrees-of-freedom. A collimating lens, a prism assembly, a polarization beam splitting prism and a quarter-wave plate are arranged between a laser device and a right-angle prism plated with a beam splitting film, so as to realize processing of incident light and reflected light, information of the reflected light and transmitted light after beam splitting is received and measured by means of a four-quadrant detector and a position sensitive detector, and the measurement of pitch angle, deflection angle and rolling angle errors, horizontal straightness errors, vertical straightness errors and light drift compensation are realized. The method and the device utilize double beam differential measurement to realize error separation, enhance the anti-interference capability, employ few optical devices and are low in light source power and cost; the optical structure is simple, the operation is convenient, the moving parts are not required to be provided with cables, and the field measurement is facilitated; and the angle measurement resolution is high.

The invention discloses an error-separation-mode-based regional pseudo-range differential enhanced positioning method of a global navigation satellite system (GNSS). The method comprises: for regional pseudo-range differential enhanced positioning of a GNSS, n reference stations and a terminal user are employed; a receiver of any reference station r receives observation data of a satellite s, and after processing, an error vector correction number of the satellite s on the reference station r is obtained; each reference station sends the obtained error vector correction number of the satellite s to the terminal user, distance weighted mean processing is carried out on a frequency relevant item error correction number of each reference station according to a base line distance between the reference station and the terminal user, and then the processed number adds to a frequency non-relevant item error correction number of one reference number to obtain a total error correction number; and then a pseudo-range measurement value adds to the total error correction number to obtain a corrected user pseudo range and then calculation is carried out according to a standard pseudo-range single-point positioning way so as to obtain a user position after error correction. With the method, the positioning performance of the single-frequency satellite navigation can be improved.

The invention discloses an online measurement system and a method for plane shape errors. The system comprises a sensor array, a data collection and analog-to-digital conversion module and a data processing and displaying module, wherein a modified least square successive two-point method plane shape error separation algorithm is used in processing software of the data processing and displaying module, and a data combining and fitting technique is introduced. The method is based on the modified least square successive two-point method plane shape error separation algorithm. The whole sampling data of a plane to be measured are subjected to partitioned processing, dimensionality reduction processing of the data array is achieved through an online partitioning algorithm, then the data processing speed is improved, the capacity of sampling points is increased, and the method mainly comprises processes such as data error separation and fitting. The data combining and fitting technique is used, so that the distribution density of sampling points is improved effectively, and the capability that a measurement system reflects the plane shape error of the plane to be measured is improved.

The invention provides a numerical control machine error identification and separation method based on processing workpiece curved surface morphology information. By the aid of the method, workpiece curved surface morphology reverse engineering, morphology separating and cutter location point reverse engineering calculating technologies are adopted in the error separation method of the numerical control machine, error separation of the numerical control machine is realized, and meanwhile, effective analyze manners and application models are provided for researchers of numerical control machine error compensation to perform intense research of error compensation model optimization and compensation effectiveness. Machine processing state monitoring, workpiece theory mathematical model and theoretical cutter path information are combined with the numerical control machine error identification and separation method, pre-processing of error collecting data can be performed, the type of a fitting model can be determined and identified according to the autocorrelation function, the partial correlation function and trimmed property thereof, order determination of the model can be performed accurately, the error separation of the numerical control machine can be completed efficiently and accurately, and meanwhile, change situation of the machine can be accurately inferred and predicted according to the obtained mathematical model formulas, so that error compensation work of the machine can be more reliable and effective.

The invention relates to a spindle turning error source tracing method based on shaft center orbit manifold learning. The method includes the following step that (1) two electrical vortex sensors are arranged on the periphery of a spindle at intervals and used for collecting spindle vibration signals; (2) the detected spindle vibration signals are processed to judge an operation state of the spindle; (3) the spindle vibration signals intersect at one point on the same plane, and a shaft center orbit is obtained after continuous sampling; (4) error separation is conducted on a spindle center orbit to obtain spindle actual rotation precision A; (5) a mapping function atlas data base Q:{f(i)=Qij|A} is obtained according to the spindle actual rotation precision A and a manifold sensitive characteristic Qij; and (6) if the spindle actual rotation precision A>=etaE, eta=0.8-1, the mapping function atlas data base Q is called, source tracing of spindle rotation errors is conducted, and corresponding faults are maintained; and if the spindle actual rotation precision A>=etaE, eta=0.6-0.8, source tracing analysis monitoring is conducted on the spindle rotation errors, wherein E is spindle rotation precision of a machine tool leaving a factory.

The invention discloses a laser interference principle-based precise main shaft rotation precision detecting and analyzing method. A precise main shaft rotation precision detecting light path comprises a box body which is used for mounting required instruments, a laser transmitter which is mounted in the box body, four optical convex lenses, a half transparent and half reflecting mirror, a reference ball and a CCD camera; part laser beams emit out from a circular hole in a square box and are projected on a target ball; the target ball is mounted on a precise main shaft through an extending rod. A laser interference pattern which is acquired by the CCD camera is analyzed through an analysis principle to acquire the rotating speed and a three-directional displacement error of the precise main shaft. The laser interference principle-based precise main shaft rotation precision detecting and analyzing method is conveniently used for engineering detection; error separation is not required; the rotating speed, and the axial and radial displacement errors of the precise main shaft can be detected simultaneously; moreover, the detection precision reaches nano scale.

The invention discloses a rocket sled test exterior data fusion method. The rocket sled test exterior data fusion method has high measurement accuracy of a radar system, high positional accuracy of a shadow shield system, and positioning and speed measurement accuracy of a differential GPS system, solves the problem of water brake section data loss, realizes better integrity of exterior data, realizes whole-course data coverage of a rocket sled test, realizes data fusion, realizes time synchronization of the radar system, the shadow shield system and the differential GPS system, and can produce data having the highest accuracy in the section. Compared with the existing error separation or function judgment method adopting a single exterior measurement technology, the rocket sled test exterior data fusion method provides more data points, solves the problem of the existing error separation method adopting the single exterior measurement error separation technology, and realizes more accurate precision analysis. The rocket sled test exterior data fusion method provides basis for higher-order term separation of an inertial measuring unit error model.

The invention discloses an adaptive filtering-based spacecraft guidance instrument on-orbit calibration method. According to the method, carrier position and attitude output by a strapdown inertial navigation device and an attitude matrix output by a star sensor are used for construction and measurement, and a measurement equation is built. A self-adaptive filtering algorithm is designed and estimated values of gyroscope random constant drift and star sensor installation error are acquired through filtering calculation so that combined system on-orbit self-calibration is realized. The method solves the problem that the existing guidance tool error separation technology causes misalignment of the spacecraft in the sky and ground coordinates, realizes real-time on-orbit calibration of an error coefficient of the guidance tool, utilizes a simple algorithm and is easy to project.

The invention discloses a method and a device for measuring a free-form surface based on reference plane comparative measurement, and belongs to the technical field of optical precision detection. Themethod uses the high-precision plane flat crystal as a reference plane of an X-Y surface, utilizes the high-precision height measurement sensor and the free-form surface measurement sensor which arecoaxially installed to detect the high-precision plane flat crystal and the surface height information of the measured free-form surface respectively, utilizes the high-precision height measurement sensor to acquire the surface height information of the high-precision plane flat crystal to monitor and compensate the straightness error of an X-direction air-floatation guide rail and a Y-direction air-floatation guide rail, performs dimension reduction error separation on the surface appearance of the free-form surface, and realizes the nanometer precision detection of the appearance of the free-form surface. The method and the device for measuring the free-form surface based on reference plane comparative measurement can realize the detection of the free-form surface, provide high-precisionthree-dimensional linear positioning and scanning measurement, inhibit the influence of the straightness error of the movement of the X-direction guide rail and the Y-direction guide rail on the measurement of the free-form surface, reduce the influence of the Abbe error of the Z axis on the measurement, and realize the large-range and nanometer precision measurement of the free-form surface.

The invention relates to a paper note processing device and a paper note processing method for teller machines. The paper note processing device comprises a note picking unit, a note conveying unit, a money detection unit and a note output unit, wherein the note picking unit is provided with a note picking wheel, one side of the note picking wheel is mounted with a note separating wheel and a damping wheel which are tangent to each other; one side of the tangent line of the note separating wheel and the damping wheel is provided with a first note pass slide plate and a first note conveying wheel group; the upper end of the note picking unit is provided with the note conveying unit provided with a second note pass slide plate and a second note conveying wheel group; two sides of the first note pass slide plate and the second note pass slide plate can be arranged with money detection sensors, the outlet of the first note pass slide plate is aligned and smoothly butted to the inlet of the second note pass slide plate, the outlet of the second note pass slide plate is connected with the inlet of the note conveying belt in the note conveying unit, the outlet of the note conveying belt is connected with a note conveying device in the note output unit. The invention changes the shape of note channel, to pick note continuously and reliably, accurately separate notes and avoid error separation, thereby confirming reliable money detection.

The invention discloses a five-point cylindricity error separation measuring method. Through measuring data acquired by three axial cross sections and five measuring heads, based on a specific error separation method, circular geometric central vectors of cross sections of a measured cylinder are extracted by regarding a connecting line of circular geometric centers of a left fixed cross section and a right fixed cross section of the measured cylinder as the datum so that data reconstruction of the cylindrical shape by regarding the connecting line of the circular geometric centers of the cross sections of the measured cylinders as the datum axis (usually not linear) is realized, and high-precision measurement and evaluation of shape errors including the cylindricity can be performed on the basis. According to the method, total harmonic separation of radial and inclination angle error motion of a shafting and linear error motion of a guide rail in a measuring process can be realized, high precision of measurement and reconstruction of the cylindrical shape is guaranteed, and the manufacturing cost of large-scale cylindrical shape online measuring equipment is reduced.

The present invention provides a four-point dynamic measurement and separation method of spindle rotation errors. A sensor support is positioned, and high-precision displacement sensors are subjectedto system calibration; each two of the four sensors are installed on the sensor support in an opposite mode, a tested part is operated, and a sampling frequency f, single-loop sampling points and sampling duration are calculated according to a rotating speed of the tested part; the displacement sensors are employed to obtain rotation position information of the tested part, and the obtained displacement sampling signals are calculated and analyzed through an error separation formula, and rotation errors and section circularity errors of a rotated shaft are obtained; and the circularity errorsand the rotation errors are subjected to quantification evaluation, and dynamic rotation errors of the tested part in the rotation operation and the shape errors of a tested section contour are obtained. The four-point dynamic measurement and separation method of the spindle rotation errors can reduce the change amount of the shaft section errors caused by thermal deformation, and employs a dynamic separation equation to separate the circularity errors and the rotation errors of the same magnitude so as to accurately obtain the rotation errors of the spindle.

The invention discloses a multipath error modeling method for a local area augmentation system (LAAS), wherein the method is suitable for multipath error correction of pseudo-range and carrier wave observed quantities of a ground monitoring station. On the basis of traditional precision single-point positioning, a non-combined precision single-point ambiguity fixing processing method is adopted torealize multipath error separation of pseudo-range and carrier wave phases; a multipath error model of an elevation angle / azimuth angle is constructed based on precise single-point positioning pseudo-range and a carrier phase posterior residual error; and real-time compensation of multipath errors of the pseudo-range and the carrier phase of a monitoring station is carried out based on the model,so that the adverse effect of the multipath errors on LAAS anomaly detection is reduced and the differential enhancement information generation precision is improved.

The invention belongs to the technical field of optical precision measurement, and relates to a method and a device for measuring the laser rotative angle and the velocity of a cooperative target resisting radial runout. The method is to take a grating as the cooperative target, use two laser beams to irradiate the grating which is arranged on a rotor, utilize the characteristic that the Doppler shift effect of two paths of diffracted grating light along the radial direction of the rotor is not sensitive to the radial runout of the rotor, and realize the measurement of the high-precision rotative angle through interference detection technology. The invention integrates grating diffraction, the Doppler effect, the interference detection technology and error separation technology, can measure the high-precision rotative angle, the angular velocity and the angular acceleration of the rotor with large radial runout, and provides precise and quick angle data for the realization of high-precision rotation control of a large electromechanical rotative angle system.

The invention discloses an on-orbit error separation method of a spacecraft guidance tool. According to the difference between a real-time telemetering speed and an exterior measuring rate of a spacecraft, through combination of a least square method and latent root estimation, an error coefficient of a guidance tool is calibrated on orbit in real time and the guidance tool error is compensated. The method solves the problem that the existing guidance tool error separation method produces mismatching of the positions of the spacecraft in air and ground coordinates of the spacecraft, realizes on-orbit real-time calibration of an error coefficient of the guidance tool, utilizes a simple algorithm and is easy to industrialize. Through combination of the least square method and the latent root estimation, confidence of the error coefficient estimation is improved.

Various computer-implemented methods are provided. One method includes determining errors across a field of a lens of a lithography system based on wafer measurements. In addition, the method includes separating the errors into correctable and non-correctable errors across the field. The errors may include dose errors, focus errors, or dose and focus errors. In another embodiment, the method may include determining correction terms for parameter(s) of the lithography system, which if applied to the parameter(s), the correctable errors would be eliminated resulting in approximately optimal imaging performance of the lithography system. Another method includes controlling one or more parameters of features within substantially an entire printed area on a product wafer using a limited number of wafer measurements performed on a test wafer. The wafer measurements may be performed on a first feature type, and the features that are controlled may include a second, different feature type.

The invention discloses an online measurement reconstruction method for a large-scale cylinder profile based on a parallel error separation method, and the reconstruction method comprises the steps: extracting the relative change amount of the geometric meter of two adjacent measurement section circles through the parallel error separation of three axial sections; obtaining the geometric center of each measurement section circle through stacking, thereby achieving the reconstruction of a cylinder profile through taking the connection line of the geometric centers of all measurement section circles of a measured shaft as the reference axis. The method can achieve the high-precision measurement and evaluation of the circular degree, cylindricity, bus linearity and taper of the cylinder profile based on the above. The method can the full-harmonic separation of radial rotation error movement and guide rail linear error movement of a shaft system in a measurement process, guarantees the high-precision measurement reconstruction of the cylinder profile, and reduces the manufacture cost of online measurement equipment of the large-scale cylinder profile.

The invention relates to a separation device for online measurement of a dynamic error based on a Bayesian network and a method thereof. The device comprises an error probe, a data receiver, a notebook computer, an ARM (advanced RISC machine) master control board module, a liquid crystal display and relevant connecting wires, wherein the error probe is connected with the data receiver through a radio transmission system, the notebook computer is connected with the data receiver through an RS232 interface and is connected with a master control board through a USB (universal serial bus) interface, and a liquid crystal interface in an ARM master CPU (central processing unit) is connected with the liquid crystal display. The online measurement can be carried out repeatedly when specific parts are machined on an experimental machine tool, and various reasonable error separation models can be determined via orthogonal experiments according to the prior knowledge and expert knowledge, so as to optimize a dynamic error separation model. On the theoretical basis of the small sample Bayesian network, the online measurement of dynamic error separation can be deeply studied, and the device and the method have great significance to improve the accuracy of numerically controlled machining and measurement in China.