82results about How to "Achieve linearization" patented technology

The circuit utilized for measuring resistances by using pulse modulation technique comprises the capacitance C1, the charging circuit, the discharging circuit, the comparator, the controller and the pulse-processing module etc. and the output of the comparator controls On / Off of the charging circuit and the discharging circuit. The resistance value can be calculated out from the number of the charging and the discharging period. The method is easy to be realized by using single chip with comparator build in, providing the measuring function of multi-channel, multi-range and high accuracy. Combining with thermistor, hygristor and photoresistor, the invented circuit can constitute the measuring, controlling and alarming devices based on temperature, humidity and light intensity.

The invention is suitable for the technical field of touch sensing and provides linear processing method and system of coordinates of a touched point at the marginal area of a touch screen, wherein the method comprises the following steps of: a. calculating initial coordinates of the touched point according to capacitance matrix data around the touched point; b. inputting the initial coordinates into a linear processing model which is established in advance and obtaining actual coordinates of the touched point, wherein the linear processing model contains functional relation information of the actual coordinates and the initial coordinates of the touched point; and c. responding the touching operation of a user at the position of the actual coordinates. When the marginal area of the touch screen is touched, the initial coordinates of the touched point, which are obtained by calculation according to the capacitance matrix data around the touched point, are input into the linear processing model to be carried out linear processing, and the actual coordinates of the touched point are obtained according to the functional relation information of the actual coordinates and the initial coordinates of the touched point in the model, therefore, the distortion is avoided when the coordinates of the touched point at the marginal area of the touch screen are calculated.

The invention provides a biological fermentation adaptive control system and a control method based on neural network inverse. The control method comprises the following steps: constructing the neural network inverse by using a neural network and a time division multiplexing time delay link, enabling the neural network to achieve an inverse system function of a biological fermentation system by adjusting the weight coefficient of the neural network, connecting the neural network inverse and the biological fermentation system in series to form a pseudo-linear compound system, decoupling the pseudo-linear compound system in a linearization mode into two pseudo-linear subsystems with single input and single output, presetting desired signals, according to the control inputs of each pseudo-linear subsystem and the outputs of the biological fermentation system of current time and prior moment, constantly renewing the parameters of a model-free adaptive controller and the control input of each pseudo-linear subsystem of the following moment, enabling the outputs of the biological fermentation system to follow the preset desired signals effectively, thereby achieving the model-free adaptive control of the biological fermentation system, and improving the control performance of a biological fermentation process.

The invention provides a magnetic grating displacement transducer based on a Hall magnetic sensitive element array. Magnetic steels with the same specification are arranged into a row and fixed onto a magnetic base to serve as a magnetic railing ruler, adjacent polarities of the magnetic steels are opposite, and six Hall magnetic sensitive elements are arranged into a row at equal intervals to serve as a magnetic head. A strong magnetic field can be obtained as the magnetic steels serve as the magnetic railing ruler, and the magnetic field is much stronger than general record magnetism. Moreover, by the aid of magnetic steel arrangement, the magnetic steels and arrangement modes can be replaced at any time, encoding and measuring length adjustment are facilitated. The Hall magnetic sensitive element array serves as the magnetic head, output signals can be linearized within a period by overlapping two curves with a certain angle of phase difference in the output signals of the six Hall elements and selecting different interpolating curves at different angles within the period, displacement calculation accuracy is improved, and the data processing procedure is simplified.

The invention discloses a construction method for an automatic disturbance rejection controller of a three-motor synchronous control system, which comprises the following steps that: three controlled induction machines, three transducers and a common load are used as a whole to form a three-motor synchronous control system; and a speed control circuit and two tension control circuits of the three-motor synchronous control system are provided with an optimized first-order automatic disturbance rejection controller respectively, wherein the optimized first-order automatic disturbance rejection controller is a device for determining a new controlled quantity according to a system setting, system controlled output and a previous controlled quantity; the optimized first-order automatic disturbance rejection controller and the three-motor synchronous control system form a closes loop; and the optimized first-order automatic disturbance rejection controller consists of an extended state observer, a proportional controller and has a disturbance estimated value for making up an error feedback controlled quantity. The method has the advantages of simple algorithm, easily adjusted parameters, better decoupling control between the speed and the two tensile forces independent of an accurate mathematical model of an alternating current machine, higher response speed, higher static accuracy, higher capacity of resisting disturbance and higher robustness.

The invention belongs to the technical field of frequency hopping communication system reliability and discloses a digital pre-distortion method of a frequency hopping communication system. The method includes: acquiring multinomial coefficients, corresponding to the ith frequency point and the jth temperature, in the expression of a digital pre-distortion device function, and using x(n) to indicate n-moment input signal of a digital pre-distortion device; acquiring the simplified expression of the digital pre-distortion device function, and by the digital pre-distortion device, acquiring the value of each signal polynomial in a lookup table according the signal received at the current moment and the signal received at Q-1 moment before the current moment; calculating the value of the digital pre-distortion device function F[x(n)], and completing linear processing of the radio frequency amplifier in the frequency hopping communication system according to the value of the digital pre-distortion device function F[x(n)].

The air spring ultra low frequency vibration separation method and device based on the differential electromagnetic actuator includes the air feed system, the high controlling system, a group of the air spring, the basal body, the electromagnetic actuator which not only provides the negative rigidity but the controlled damping force for the system, the speed sensor, the force sensor, the displacement sensor, the power amplifier, the model / number convertor, the number / model convertor and the controller. The invention provides the negative rigidity and the controlled initiative damping force by the reciprocity of the differential electromagnetic and the gag bit fixed on the basal body and the ground separately which is used in the field of high need for the cross-portrait ultra low frequency vibration separation capability.

The invention relates to an economic dispatching technology of a power system, in particular to a multi-source optimal dispatching method considering coordination of wind power, nuclear power and pumped storage. The method includes a step 1 of taking into account the cost of abandoning wind and the cost of peaking of nuclear power, and constructing a coordinated optimization model of wind core with multiple power sources; a step 2 of Linearizing the nuclear power peak shaving constraint by subdividing the nuclear power peak shaving depth, solve the scheduling model based on Cplex, and making the scheduling plan. By taking into account the cost of wind power and nuclear power peak load regulation, wind power and nuclear power are included in the coordinated dispatching, which can greatly alleviate the pressure of peak load regulation, reduce the frequent start-up and shutdown of conventional generating units, and improve the operation economy of the power system with wind power and nuclear power in the coastal area. By subdividing nuclear power peak shaving depth linearization nuclear power peak shaving constraint method, nuclear power peak shaving operation constraint linearizationis realized, so that the scheduling model can be solved efficiently based on commercial optimization solver Cplex, and an accurate optimal scheduling scheme can be obtained, which is helpful to reduce the system operation cost.

The embodiment of the invention discloses an outdoor unit and a method thereof for improving output performance. The method comprises the following steps that: the outdoor unit (ODU) receives a first analog signal sent by an indoor unit (IDU) and converts the received first analog signal into a first digital baseband signal through down-conversion; and the ODU receives a second analog signal output by a power amplifier (PA) and converts the received second analog signal into a second digital baseband signal through the down-conversion; the ODU obtains a digital predistortion coefficient according to the first and second digital baseband signals; and the ODU performs digital predistortion processing on the first digital baseband signal by adopting the digital predistortion coefficient to acquire a signal after the digital predistortion processing and sends the signal to the power amplifier. The outdoor unit and the method thereof for improving the output performance can realize the linearization of a sender link without requiring the PA to work in a linear mode.

The present invention is continuous precise metal belt measuring X-ray process and equipment. The measurement equipment includes central control processor, arithmetic device, site controller, site display, X-ray high voltage power source, cooling controller; X-ray source, X-ray detector, measurement transducer, C-rack cooler, and constant temperature cooling circulator connected together. By means of the digital control and transmission technology and constant temperature technology, the present invention realizes the long distance transmission of the measurement signals, high measurement precision within 0.1 % and measurement responding time up to 5 ms, and is suitable for continuous stable measurement of metal belt.

A path tracking control method suitable for a high-speed limiting working condition is characterized in that the method comprises an expected path calculation module, a tire model linearization module, an MPC controller and a CarSim automobile model; the expected path calculation module is used for calculating an expected lateral displacement and a yaw angle of the automobile; the tire model linearization module is used for realizing linear approximation of nonlinear tire force in a prediction time domain; the CarSim automobile model is used for outputting the actual state quantity of the automobile, wherein the actual state quantity comprises a longitudinal speed, a lateral speed, a yaw velocity, the yaw angle and the lateral displacement of the automobile; and the MPC controller is usedfor solving a front wheel turning angle of the automobile according to the expected lateral displacement, the expected yaw angle and the actual state quantity of the automobile, inputting the front wheel turning angle to the CarSim automobile model, and controlling the automobile to realize path tracking control.

The invention discloses an economical dispatching method for an AC / DC (alternating current / direct current) interconnected power grid and belongs to the field of economical dispatching of an electric power system. The method comprises steps as follows: firstly, establishing an optimal power flow model of economical dispatching of the AC / DC interconnected power grid consisting of objective functionsand constraint conditions, and converting the model into an optimal power flow continuous model of the AC / DC interconnected power grid with a fixed conversion transformer's tap changer gear, and performing solving; utilizing the optimal solution of the optimal power flow continuous model as an initial value, restoring an integer representing the conversion transformer's tap changer gear to be a variate, establishing an optimal power flow mixed integral model of the AC / DC interconnected power grid with the to-be-optimized conversion transformer's tap changer gear, and performing solving; finally, recovering AC feasibility to obtain the economical dispatching scheme of the AC / DC interconnected power grid. According to the method, modeling and solving of the AC / DC interconnected power grid are converted into the problem of non-linear optimization of mixed integrals, an iterative computing framework is provided, and the economical and feasible dispatching scheme can be obtained with the method.

This invention relates to a manufacturing method for a huge magnet impedance effect magnet-sensitive device based on micro-electromechanical system (MEMS), which applies MEMS technology to process a double-face oxidized silicon chip to get an aligned symbol carved in double faces so as to increase the aligned accuracy when exposing, applies a quasi-LIGA photo etching technology and micro plating to prepare a zigzag sandwich structure FeNi / Cu / FeNi soft magnet multiplayer membrane material, applies physical etching to remove the substrate to avoid the erosion brought with wet etching and offsets the huge magnet impedance effective curves by selecting suitable magnets to make the magnet-sensitive device to work in the linear zone.

The invention discloses a digital predistortion system of a millimeter wave wideband power amplifier. The digital predistortion system comprises a digital predistortion module, a digital-to-analog converter, an up-converter, a power amplifier, a feedback loop, an analog-to-digital converter and a model extraction module. The invention also discloses a digital predistortion method of a millimeter wave wideband power amplifier. Through adoption of the digital predistortion system and method, linearization of a millimeter wave power amplifier excited with a large bandwidth signal is realized by avery limited digital signal processing rate; a good linearization effect is achieved; and the implementation burden of a digital signal processing module is lowered. The digital predistortion systemand method have broad prospects in 5G millimeter wave application.

The invention relates to an analog quantity input circuit using digital isolating and conditioning technology, and is characterized in that the analog quantity input circuit comprises a control logic circuit, a photoelectric coupler, a Sigma-Delta mode A / D converter with a program control amplifier, an input processing circuit, a built-in cold-end temperature sensor, a serial EEPROM and a DC / DC power converter; the output end of the input processing circuit is connected with the program control amplifier of the Sigma-Delta mode A / D converter; the output end of the program control amplifier is connected with the A / D converter of the Sigma-Delta mode A / D converter; the output end of the A / D converter is connected with the photoelectric coupler; and the output end of the photoelectric coupler is connected with the control logic circuit. The analog quantity input circuit has simple and reliable structure by using a photoelectrically isolated SPI data interface, realizes complete electric isolation between channels and control device among each channel, and realizes digital correction and linearization of input channel error, thereby having high cost performance and providing great convenience for the user using automation control devices.

The invention discloses a neural network generalized inverse decoupling controller of an automobile chassis integrated system. The automobile chassis integrated system is composed of a driving front-wheel steering sub-system, a direct yawing moment control sub-system and a driving suspension frame sub-system of an automobile chassis. A static neural network and a plurality of linear elements form a neural network generalized inverse of the automobile chassis integrated system, and the neural network generalized inverse and the automobile chassis integrated system are connected in series to form a generalized pseudo-linear system. The generalized pseudo-linear system is decoupled to form three pseudo-linear sub-systems with single input and single output. A linear closed-loop controller is used for carrying out PID regulation on the pseudo-linear sub-systems. The linear closed-loop controller and the neural network generalized inverse form the neural network generalized inverse decoupling controller of the automobile chassis integrated system. The invention further relates to a constriction method of the neural network generalized inverse decoupling controller of the automobile chassis integrated system.

The invention provides a variable weight subDAC correction method for a high-precision successive approximation structure ADC, and the method comprises the steps: starting an analog-digital converter for sampling, collecting and obtaining a conversion curve; segmenting the conversion curve according to the resolution of the analog-digital converter; presetting correction codes for offset error correction; respectively employing different correction codes for each segment to carry out the correction of offset errors. According to the invention, a segmented correction method is employed for achieving the linearization of the whole conversion curve, and different weight correction values are employed at different segments of the conversion curve, thereby achieving the linear correction of the whole conversion curve, achieving the comprehensive correction of various types of conversion errors, greatly reducing the matching errors, caused by the changes of an analog input voltage, of a device, and meeting the requirements of a wide-input high-precision analog-digital conversion circuit.

The invention discloses a linear frequency modulation continuous wave radar water level telemeasuring device and method. The linear frequency modulation continuous wave radar water level telemeasuring device comprises a radar transceiver, a radar signal screening and amplifying circuit and a microcontroller; the radar transceiver comprises a phase-locked loop, a transmitting antenna, a first mixer and a receiving antenna, wherein the output end of the phase-locked loop is connected with the transmitting antenna, and a linear frequency modulation signal output by the output end of the phase-locked loop is transmitted through the transmitting antenna; two input ends of the first mixer are connected with the output end of the phase-locked loop and the receiving antenna respectively, and an echo signal is received through the receiving antenna; the output end of the first mixer is connected with the input end of the radar signal screening and amplifying circuit, the output end of the radar signal screening and amplifying circuit is connected with an ADC sampling end of the microcontroller, and sampling processing is carried out on the signal output by the output end of the radar signal screening and amplifying circuit through the microcontroller. The linear frequency modulation continuous wave radar water level telemeasuring device can effectively overcome the influence of temperature drift, ensure linearity of the transmitting frequency of the radar transceiver and effectively improve measuring precision of a radar water level indicator.

The invention discloses a two-motor variable-frequency speed control system considering efficiency optimization and a decoupling control method thereof. The system comprises a two-motor variable-frequency speed control system body and a least squares support vector machine (LSSVM) inverse system which are connected in series to form a pseudo-linear compound system. The LSSVM inverse system and a closed loop controller jointly form an LSSVM inverse controller. The decoupling control method comprises the steps of building a mathematical model of the two-motor variable-frequency speed control system body considering motor rotor magnetic linkage and performing reversibility analysis; designing the LSSVM inverse system consisting of an LSSVM and an integrator and using the LSSVM inverse system as a feedforward controller to be connected with an original system in series to obtain the pseudo-linear compound system and achieve approximate linearity and decoupling of the two-motor variable-frequency speed control system body; using a proportion integration differentiation (PID) controller as an additional controller to achieve closed loop control; and adopting rotor magnetic linkage optimization based on a motor loss model to achieve decoupling control of the two-motor variable-frequency speed control system considering efficiency optimization.

The invention relates to the field of automatic optical power control of laser, which discloses an automatic optical power control system of laser, comprising a detecting diode for optical power in trailing direction, TIA, proportional integrated circuit, power driver, protective circuit and the laser diode. The said TIA is composed of an operational amplifier, a digital-analog converter and a fixed resistance; The reference input Vr of the said digital-analog converter is connected with the output terminal of the operational amplifier whose output voltage is linked with the fixed resistance; The other end of the fixed resistance is connected with the reverse input terminal of the operational amplifier. Based on the existing topological structure of the circuit, the invention realizes the linearization and high precision adjustment of the optical power control circuit by manipulating the digital-analog converter.

The invention discloses an automobile path tracking control method based on a corner optimization sequence. The method is characterized in that the method employs an MPC path tracking controller, a tire slip angle estimation module, a CarSim automobile model, and a tire model linearization module. The tire slip angle estimation module is used for estimating a tire slip angle sequence in a prediction time domain, the tire model linearization module is used for carrying out linear processing on nonlinear tire force in the prediction time domain, and the MPC path tracking controller optimizes andsolves a front wheel turning angle sequence of an automobile and inputs the front wheel turning angle sequence to the CarSim automobile model to realize path tracking control.

The invention provides an ecological index prediction method based on the mangrove forest ecological big data, which mainly comprises the following steps of 1) determining the ecological protection area of the mangrove forest; (2) establishing a mangrove forest ecological index data set; 3) preprocessing the data set T and the data set Y; 4) performing linearization processing on the data set T toobtain a linear training set S; 5) establishing a mangrove forest ecological index prediction model; 6) by utilizing the mangrove forest ecological index prediction model, the linear training set S and the mangrove forest ecological health evaluation grade judgment table, predicting the future ecological health condition of the mangrove forest in the mangrove forest ecological protection area. According to the method, the predicted important ecological indexes are utilized, and a mangrove forest ecological health evaluation grade judgment table is combined, so that the ecological health condition of the mangrove forest can be accurately predicted.

A power-extensible wave beam directional digital pre-distortion device comprises: a DPD module for performing DPD processing on one path of input signal; a beam splitting gain module which is used forcarrying out beam splitting and gain adjustment on the DPD processing signal; N power amplifiers which are used for carrying out power amplification on the N paths of gain signals and determining N paths of power amplification signals; a coupler which determines one path of coupling signal; a modeling module which is used for determining a power extensible model according to the power level, theinput signal and the coupling signal, and determining N paths of extensible power amplifier signals according to the current input signal and the power extensible model; a beam combining training module which is used for carrying out beam combining on the N paths of extensible power amplifier signals, determining beam combining signals, carrying out DPD training according to the beam combination signal, and updating a DPD module. The power amplifier, the phase shifter, the variable gain amplifier and the antenna array are regarded as a nonlinear system for overall modeling, linearization of main beam direction signals is achieved, and the difficulty that complex feedback cannot be achieved in an actual system is overcome.

The invention discloses an RBF neural network generalized inverse internal model control method of a linear motor. A generalized inverse system of a permanent magnet linear motor free of an accurate mathematical model is approached through an RBF neural network; and the generalized inverse system is connected with a permanent magnet linear motor system in series, so that linearization and decoupling of a permanent magnet linear motor control system are achieved; and through correction on a decoupled pseudo linear system through inner model control, the key properties of the control accuracy, the dynamic response capability, the robustness and the like of the permanent magnet linear motor control system are more excellent.

The invention discloses a modulation method of a Semi-Z-source single-phase inverter. The modulation method includes: building the linear modulation algorithm of Semi-Z-source single-phase inverter circuit topology; according to modulation algorithm requirements, determining the voltage value of a capacitor in the Semi-Z-source single-phase inverter circuit topology, and determining the relation between inductor current ripples and capacitor current ripples; solving the required inductance of the inductor according to the relation; substituting the voltage value of the capacitor and the required inductance into the built modulation algorithm, and solving the duty ratio of a switch, and determining the on and off states of the switch according to the duty ratio. The modulation method has the advantages that the limitation that an original method is only applicable to small-power occasions and low in output frequency is broken through, the inverter topology is allowed to have the abilityof driving heavy loads and outputting medium-frequency alternating currents, the voltage stress of the switch device is lowered, control signal and output linearization is achieved, and controller design is facilitated.

The invention discloses a radial active magnetic suspension bearing fault tolerant control method based on coordinate transformation, belonging to an active magnetic suspension bearing fault tolerant control method; the control method comprises the following steps: firstly, radial active magnetic suspension bearing faults are classified according to the structure of a radial active magnetic suspension bearing, and the faults having the same effect on a stator magnetic circuit is defined into the same kind; secondly, aiming at each kind of the radial active magnetic suspension bearing faults, one condition is chosen, current allocation matrix is obtained by adopting bias current linearization theory; thirdly, the current allocation matrix is adopted, the radial active magnetic suspension bearing fault tolerant control method based on coordinate transformation is adopted to realize the fault tolerant control of the faults with the same kind. The method reduces the number of current allocation matrixes needed to be solved in the radial active magnetic suspension bearing fault tolerant control.

The invention relates to a multi-centrifugal sheet combined type speed controller and a brushless motor. The multi-centrifugal sheet combined type speed controller comprises a stator, a winding, a driving rotor, a speed control rotor, a speed controller, a motor shaft, a machine shell and the like, wherein the driving rotor occupies a large part of the area of a stator gap, plays a main role of energy conversion, is fixedly connected with the motor shaft, and outputs mechanical torque through the motor shaft. The multi-centrifugal sheet combined type speed controller is characterized in that the speed control rotor is connected with the speed controller, the speed controller comprises a shell, two groups of specifically combined centrifugal sheet groups in symmetrical configuration, a cam shaft sleeve and a spring are arranged in the shell, so that a rotating speed sensing adjusting mechanism, a low-speed locking mechanism and a torque mechanism are formed; the speed controller utilizes the principle of centrifugal force and flux weakening speed control, self-adaptive stepless speed change is realized, so that the permanent magnet brushless motor outputs a stable large torque at a low speed and can also output stable and efficient power at a high speed.

A high-linearity delay chain comprises a calibration module, a delay chain module and a first multiplexer, and the delay chain module comprises 2n-1 cascaded delay units. Each delay unit comprises 2mdelay paths and a second multiplexer, and each delay path outputs an input signal of the delay unit to the second multiplexer after different delays; the second multiplexer selects the signal output after passing through the corresponding delay path according to the m-bit calibration code; the clock end of the calibration module is connected with a clock signal, and the calibration end of the calibration module is connected with the output end of the last cascaded delay unit, and is used for generating m-bit calibration codes, judging whether the calibration codes are added or subtracted by one when the rising edge of the clock signal comes, and transmitting the input signal of the delay chain to the input end of the first delay unit in the delay chain module; input end of first multiplexer is connected with input end of delay chain module and 2n- And the selection end of one delay unit is connected with an n-bit selection signal, and the output end of the delay unit is used as the output end of the delay chain.

The invention, which belongs to the technical field of follow-up control, provides a pitching angle tracking control method of a follow-up system, thereby realizing rapid and high-precision follow-upcontrol of a weapon tracking system pitching machine. According to the method, a pitch given angle value and an angle feedback value are compared through a follow-up control system to calculate an angle error; a pitching speed given value is outputted by using a feedforward+proportional differential (PD) control algorithm; the pitching angle speed given value is converted into a motor speed givenvalue by using a speed conversion equation and the motor speed given value is outputted to a motor driver to realize PID control linearization; a driver conducts speed control to drive a motor to rotate and an electric actuator cylinder is driven to stretch out and draw back, so that the rapid and high-precision target tracking control over the pitching mechanism is realized.