356results about How to "Compensation error" patented technology

A machine tool for machining and testing the non-spherical optical part features that its main body has the symmetrical gantry frame structure with X, Y, Z and C axises designed modularly, the milling head or polishing mechanism is installed to the Z-axis bench, and the floating platform equipped with the in-line measuring and error-measuring unit for plane and parallel to Y axis is arranged on main body. Its advantage is high machining precision.

The invention discloses a method for compensating a signal of a high-precision pressure sensor. The method comprises the following steps of: inputting a pressure measuring signal and a temperature measuring signal measured by a pressure sensor into a digital signal processor; converting an original pressure signal into a pressure signal which is not subjected to temperature compensation and capable of eliminating lagging errors through a lagging error compensation method; carrying out temperature correction on the pressure signal through a signal interface processing method to acquire the pressure signal subjected to the temperature correction; and processing the pressure signal and the temperature signal subjected to the temperature correction to acquire a pressure signal and a temperature signal subjected to temperature compensation and non-linear error compensation through a temperature compensating method. The invention can compensate lagging errors and non-linear errors of the pressure sensor and errors caused by the change of the environment temperature, and can improve the measurement precision of the pressure sensor.

The invention discloses a control method of brushless D.C. motor (BLDC) position signal phase error based on back EMF zero crossing point reconstruction, belonging to the technical field of the control method of BLDC non-position sensor technology. The method comprises the following steps: respectively collecting three phases of filtered terminal voltage waveforms, the coordinate systems thereof being alfa coordinate system in which vectors of three axels in the alfa coordinate system are used for representing three filtered terminal voltages, calculating the projection of the three vectors of the alfa coordinate system in the belta coordinate system. The degree beta by which the belta coordinate system lags behind the alfa coordinate system is controlled to achieve real-time compensation for the error of position signal phase caused by RC first order low pass filtering, and the zero-crossing points of the three vectors in the belta coordinate system are phase-changing points, thus realizing accurate phase-changing. The invention can avoid being affected by RC filtering under the working condition of broad rotating speed.

The invention discloses a movable drilling and milling robot system achieving automatic addressing. The movable drilling and milling robot system comprises a movable drilling and milling robot body subsystem, an integrated control subsystem and a navigating and positioning subsystem; the movable drilling and milling robot body subsystem comprises an omni-directional intelligent moving platform module, a manipulator module and a drilling and milling end executer module; the navigating and positioning subsystem comprises an omni-directional intelligent moving platform navigating and positioning module, a manipulator positioning precision improving module and a high-precision end executer positioning module; the integrated control subsystem comprises a central control module, an omni-directional intelligent moving platform control module, a manipulator control module, an end executer control module and an energy management control module. The system can rapidly adjust the layout according to changes of manufacturing tasks or production environments, is suitable for multi-variety and middle-small-batch production and overcomes the processing technological difficulties of an overlarge structure.

The invention discloses a nonlinear interference control method and a nonlinear interface control system for a permanent magnet linear synchronous motor (PMLSM). According to the control method, an online estimated compensating voltage value ud of a wavelets neural network (WNN) is added on the basis of up+uf of the conventional composite feedforward proportional differential control, and the sum of up, uf and ud is used as the control voltage U(t) of a stator of the PMLSM, namely the control voltage U(t) is equal to up+uf+ud. The WNN is a three-layer forward network, and ud is the sum of omega1psi1, omega2psi2, ..., omegajpsij, ..., and omegampsim. A learning signal of the WNN is an output value of a proportional differential controller. The control system comprises a digital signal processing controller, a power driving module connected with the stator of the PMLSM, and a rotor displacement sensor arranged on the PMLSM. The WNN is used for effectively compensating interference such as PMLSM thrust fluctuation and frictional force and errors of a fixed parameter model, and tracking accuracy can be improved by more than 2.7 times; and the control system can be implemented by universal hardware, and is convenient to popularize and use.

The invention discloses a gas transmission pipeline leakage detection system and method suitable for multiple state changes. The gas transmission pipeline leakage detection system and method suitable for the multiple state changes comprise a gas transmission pipeline leakage detection system (system for short) suitable for multiple state changes and a gas transmission pipeline leakage detection method (method for short) suitable for the multiple state changes. The system comprises an input module, a gas transmission pipeline transmission mechanism model, a neural network compensation model, a pipeline system signal collection module, a correction output processing module and an error obtaining module; the method aims at building a gas transmission pipeline mathematical model, obtaining a gas transmission pipeline state-space equation, processing flow signals of the gas transmission pipeline state-space equation, building the RBF neural network and verifying a detection model; the gas transmission pipeline flowing mathematical model and the detection method based on knowledge are combined, tail end loads, the pipeline diameter, pipeline bending, the environment temperature, the gas wave velocity, a compression coefficient, the pipeline hydraulic frictional resistance coefficient and the like are researched, and the gas transmission pipeline leakage is monitored; and a pipeline model is trained, and an accurate model suitable for the pipeline condition changes is obtained.

The invention discloses a displacement sensor type piezoceramic driver based on a flexible mechanism. The piezoceramic driver comprises a flexible mechanism, connection bodies, a matrix, a displacement sensor, a tube type piezoceramic and a piezoceramic sleeve, wherein the flexible mechanism consists of two-double parallel-four bar mechanisms which are mutually vertical; the two double-parallel four-bar mechanisms share a center rod; adjacent bars of each double parallel four bar mechanism are connected through flexible hinges; one end of the center rod is provided with an installation position of a tool rest; the other end of the center rod is connected with the matrix through the piezoceramic sleeve; the tube type piezoceramic is installed in the piezoceramic sleeve; the displacement sensor installed on the matrix is arranged on inside the piezoceramic sleeve and is used for sensing a displacement signal of the center rod; the tube type piezoceramic drives the center rod; and four side bars, parallel to the center rod, in the flexible mechanism are connected with the matrix through a connecting body respectively. The displacement sensor type piezoceramic driver based on the flexible mechanism has higher rigidity, output displacement and inherent frequency.

The invention relates to a circuit arrangement for the dynamic control of ceramic solid-state actuators, such as piezotranslators with energy recovery by means of magnetic intermediate stores and/or storage capacitors as well as by clocked switches. For achieving a predetermined linear voltage characteristic at the piezotranslator, according to the invention, a single inductive intermediate store is arranged in the secondary circuit, which is connected in series with the piezotranslator, and the secondary circuit is designed as a half-bridge. The switches provided in the respective half-bridge are controlled at a high cycle or switching frequency by an external controller, with the series connection of piezotranslator and inductive intermediate store furthermore carrying a superimposed bridge direct current in order to ensure the desired charging of the capacitance of the piezotranslator, on the one hand, and to optimize the energy recovery, on the other hand.

An ejection mechanism, particularly for mobile pieces of furniture, comprising a curve guide (7, 7', 7'', 7''', 7''''), along which a driver (11, 11', 11'', 11''', 11'''') can be displaced, wherein the driver (11, 11', 11'', 11''', 11'''') is prestressed in one direction by at least one force accumulator (8, 8') and can be latched in a locked position at the curve guide (7, 7', 7'', 7''', 7'''') with the stressed force accumulator (8, 8'), and an activator (5, 5', 5'', 5''', 5''''), which can be coupled to the driver (11, 11', 11'', 11''', 11'''') at least in the locked position, wherein the activator (5, 5'', 5''', 5'''') can be moved relative to the curve guide (7, 7'', 7''', 7'''') or the curve guide (7') can be moved relative to the activator (5'), wherein in the locked position the driver (11, 11', 11'', 11''', 11'''') can be released by a relative movement of the activator (5, 5'', 5''', 5''''); relative to the curve guide (7, 7'', 7''', 7'''') or by a relative movement of the curve guide (7') relative to the activator (5'). The activator (5, 5', 5'', 5''', 5'''') and/or the curve guide (7, 7', 7'', 7''', 7'''') can be moved both in a first direction and in an opposite second direction to release the driver (11, 11', 11'', 11''', 11'''').

The combined navigation based on star sensor calibration optimizing the inertia, astronomical and satellite for all kinds of high precision fly guide. It modifies the installation error based on the star diagonal distance to get high precision information, calculating the disguise distance and disguise distance ratio relative to the inertia guide position through the astronomical data provided by GPS and the location and speed provided by the inertia guide and comparing with the disguise distance and its ratio measured by the GPS as the measuring value, through combined Kalman filter model to estimate the inertia guide system and GPS error and ratifying accordingly to these two systems based on feedbacks. It can improve combined guide navigation precision and reach a high quality combination, whose precision is better than any single guide navigation precision.

The invention discloses a method and apparatus capable of measuring phase delay of arbitrary wave plate including half-wave plate and full-wave plate, characterized in that using separately longitudinal mode direct-reading method, additive wave plate generated phase offset method and frequency splitting method aimed at the wave plate of different phase delay range to measure, therefore solving the problem of incapability of measuring the half/full wave plate using the frequency splitting based method for measuring phase delay of wave plate. In order to improve the measurement accuracy, the invention compensates separately for the system error produced by inclined installation of wave plate and anisotropy caused by laser intracavity residual stress. The invention is capable of measuring arbitrarily wave plates in a system with high measurement accuracy, simplicity and low costs, obtaining the laser wavelength by wave plate phase delay through measuring laser frequency, providing reference for other wave plate measurement methods.

The invention discloses a low-orbit-satellite orbit prediction method based on atmospheric resistance model compensation, and relates to the field of aerospace. The method includes the steps that S1, orbit determination is carried out on a satellite through the pseudo-range observed quantity of a satellite-borne GNSS receiver and ultra-rapid ephemeris issued by an IGS, and kinetic parameters of the satellite are obtained, wherein the kinetic parameters include the position, the speed, the CD, the CR and the piecewise constant experience acceleration parameters of the satellite; S2, the experience acceleration is modeled, then the model and a determinacy kinetic model compose a reinforcing type kinetic model, and finally the position and the speed of the satellite at the orbit determination final epoch are used as initial values to carry out orbit predicting. According to the method, it is only required that the pseudo-range observed quantity of the satellite-borne receiver exists; in addition, achievement is easy, and the experience acceleration obtained after orbit determination is fitted and then can be applied to orbit predicting; meanwhile, the method has certain universality and operability, the errors of an atmosphere resistance model are compensated, predicating accuracy is improved, and the method is applied to in-orbit high-accuracy navigation.

A method for performing multi-parameter synchronous measurement by means of a Kelvin probe force microscope relates to measurement technology for surface topography, mechanical property and local surface potential. The method aims to settle a problem of incapability of realizing synchronous representation of the surface topography, the mechanical property and the local surface potential of a sample through a traditional Kelvin probe force microscope. Vertical reciprocation of a conductive probe is kept always; and in one motion period, when a maximal interaction force between the conductive force and the sample reaches a preset value, a corresponding time point is B, and a surface topography image is measured at the point B. When the conductive probe is separated from the surface of the sample, the corresponding time point is C, and an equivalent Young's modulus image is obtained between the point B and the point C by means of a DMT model. After the conductive probe is separated from the sample, the conductive probe continuously rises to a preset height and is kept for a certain time period, and the surface potential difference between the conductive probe and the sample is measured in the time period. The method provided by the invention is suitable for measuring the surface topography, the mechanical property and the local surface potential of the sample.

The invention discloses a device and a method for compensating a composition error of a main shaft in real time. The device comprises a radial capacitance displacement sensor, an axial capacitance displacement sensor, a control computer, a two-degree of freedom sharp knife servo controller and a two-degree of freedom sharp knife servo unit, wherein the output end of the radial capacitance displacement sensor is connected with the first input end of the control computer; the output end of the axial capacitance displacement sensor is connected with the second input end of the control computer; the two-degree of freedom sharp knife servo controller is respectively connected with the control computer and the two-degree of freedom sharp knife servo unit; the two-degree of freedom sharp knife servo unit is connected with a processing cuter; the radial capacitance displacement sensor is arranged at one side of the processing cutter, and the axial line thereof is vertically intersected with the axial line of a work-piece; the axial capacitance displacement sensor is arranged on one end face of the work-piece, and the axial line thereof is vertical to the end face of the work-piece. The device and the method for compensating the composition error of the main shaft in real time can perform on-line and real-time measurement and compensation on the composition error simply, rapidly and comprehensively, and can be widely applied to the field of precision machine tool machining.

Provided is an optical position sensor, which relates to a measuring unit having a first ring structure (P1) with a first translucent ring area and a first opaque ring area. A boundary line has a periodic form, particularly a monotonous form and a sine form with an amount of periods between the translucent and the opaque ring areas in azimuth direction. The periodic form includes a first periodic number (n1), at least one light source for lighting the measuring unit, and a first sensor device encircling the center in a ring-shaped arrangement. The first sensor device has at least two sensor groups of the same. The sensor groups are staggered in azimuth direction with an integer period, and the deviation is smaller than 10% of the period, and preferably smaller than 5% of the period, and most preferably smaller than 1% of the period. Each sensor has at least one optical sensor element (Sij) for receiving light of the first ring structure.

The invention provides a detector for the magnification and distortion of projection lenses and a method thereof. The method comprises: preparing a measurement mask plate provided with grid transparent marks; providing a mask plate which chromium plating surface is coated with positive photoresist and has not patterns, as a transfer mask plate; using the method of object image alternative exposure, and the relative devices such as gumming development, etching and overlay measurement and the like, to measure the magnification error and distortion of a projection lens fixed on the detector. The detector and the method can be used to measure the magnification error and distortion of projection lenses can eliminate the system error caused by the traditional methods as standard grid template and the like and is especially suitable for the detector system applied for measuring the projection objective lens which nominal magnification is -1 around.

The invention belongs to the field of robot parts machining, and particularly discloses a single-degree-of-freedom high-bandwidth force-controlled grinding and polishing device and application thereof. The device comprises a connecting base, a driving module, a transmission module, a measuring module and a polishing module, wherein the connecting base is used for connecting the single-degree-of-freedom high-bandwidth force-controlled grinding and polishing device with the tail end of an industrial robot; the driving module is a vertically placed voice coil motor and comprises a stator and a rotor, the upper end of the stator is connected with the connecting base, and the lower end of the rotor is connected with the transmission module; the lower end of the transmission module is connectedwith the polishing module; and the measuring module is used for measuring displacement and contact force of the polishing module. According to the single-degree-of-freedom high-bandwidth force-controlled grinding and polishing device, the driving module adopts the voice coil motor, the displacement of the voice coil motor is adjusted in real time by controlling the input current of the voice coilmotor, so that the displacement and the contact force of the polishing module are adjusted in real time, and compared with an existing servo motor, the advantages of high response, high bandwidth andno need of conversion for linear driving are achieved, and the uniformity and consistency of the surfaces of complex curved surface parts are guaranteed.

The invention discloses a quick initial alignment method for a moving base of an SINS (strapdown inertial navigation system) based on lie group description. The method comprises the following steps: replacing traditional quaternion description with lie group description to realize calculation of SINS attitude transformation; establishing a linear initial alignment model by using a lie group differential equation; establishing an augmented initial alignment model by taking gyroscopic drift as an augmented state quantity; and then realizing synchronous estimation of an initial attitude matrix and gyroscope constant drift by adopting a matrix-form Kalman filtering algorithm. According to the quick initial alignment method, the gyroscope constant drift is taken as the augmented quantity, and compared with a traditional initial alignment model, a more accurate augmented linear alignment model is established. The alignment method disclosed by the invention can realize one-step direct alignment of the SINS, greatly shortens the alignment time, is convenient for compensating errors in a strapdown resolving process, effectively improves the alignment precision, and is more suitable for practical engineering application.

The invention discloses a sensor installation device, and relates to the field of semiconductor equipment manufacturing. The device can adjust the inclination angle of a sensor, synchronously achieves adjustment and locking and simplifies operation steps. The sensor installation device comprises an angle adjusting block, a moving adjusting block and an elastic connector. The angle adjusting block and the moving adjusting block are arranged in parallel, the sensor is fixedly connected with one end of the angle adjusting block, and accordingly the sensor is located in parallel space between the angle adjusting block and the moving adjusting block; the elastic connector is perpendicular to the angle adjusting block and the moving adjusting block, the two ends of the elastic connector are fixedly connected with the side face of the other end of the angle adjusting block and the side face of the moving adjusting block, and accordingly the angle adjusting block and the moving adjusting block are connected together; the elastic connector is bent in the direction towards or far away from the sensor to achieve adjustment of the depression angle or the elevation angle of the sensor; the moving adjusting block moves in the horizontal direction so as to adjust the position of the sensor.

The invention provides a model error compensation method for an ultra-high-velocity aircraft autonomous navigation system. The model error compensation method belongs to the field of autonomous navigation and is especially suitable for an ultra-high-speed aircraft autonomous navigation system. The method comprises building an autonomous navigation system measurement model through considering the measurement error of a geomagnetic sensor and constructing an autonomous navigation system dynamical model with power compensation and a unscented Kalman filter (EKF)-based autonomous navigation algorithm. The method simplifies the model and calculation, solves the problem that the ultra-high-velocity aircraft in high dynamic flight causes flashing of GNSS signals, no accelerometer information anddynamic model inaccuracy and guarantees stable work of the autonomous navigation system.

The invention discloses a user data management system based on cloud computing. The user data management system comprises a frequency acquisition circuit 1, a frequency acquisition circuit 2, a peak feedback circuit, a frequency selection detection circuit and an operational amplifier limiting circuit, the frequency acquisition circuit 1 acquires the modulated analog signal frequency in the cloudserver; wherein the frequency acquisition circuit 2 acquires analog signal frequency before demodulation of the control terminal, the peak feedback circuit uses an operational amplifier AR1, an operational amplifier AR2, a diode D2 and a diode D3 to form a peak detection circuit to extract a peak of an output signal of the frequency acquisition circuit 1, The frequency selection detection circuituses a resistor T11-resistor R15 and a capacitor C3-capacitor C5 to form a dual-T frequency selective amplification circuit to select and amplify signals.. Meanwhile, an operational amplifier AR3, anoperational amplifier AR4, a diode D7 and a diode D8 are used for forming a peak value circuit to extract peak value signals, and an operational amplifier limiting circuit is used for forming a limiting circuit through a diode D9 and a diode D10 to limit the amplitude of the signals and then outputting the signals to serve as correction signals of analog signals before demodulation of a control terminal.