124results about How to "Guaranteed output accuracy" patented technology

The invention discloses a clock modulating algorism based on minimum square law pattern, which comprises the following steps: building mathematical model of phase difference; adopting phase-detector result of front N s to control the frequency of high-stability crystal per s; reserving the phase-detector result as parameter of next second preestimation; compensating the accumulated phase difference through 2 delta phase-detector result; controlling the frequency fluctuation of high-stability crystal within little scale; affirming the output precision of clock.

The invention discloses a ship course controller based on a fuzzy PID algorithm. The controller includes: an input unit for obtaining an ideal rudder angle deflection according to the rudder deflection angle required by the ship and the output of a stepping motor drive unit; The digital conversion unit is used for digital-to-analog conversion and analog-to-digital conversion; the fuzzy parameter correction unit is used to perform fuzzy parameter correction according to the output of the stepper motor drive unit and the ideal rudder angle deflection; the PID adjustment unit is used to correct the fuzzy parameter according to the fuzzy parameter correction unit and The output of the stepper motor drive unit is adjusted by PID; the PWM signal output unit is used to output the PWM waveform for controlling the work of the stepper motor according to the output of the PID adjustment unit; the stepper motor drive unit is used to drive the stepper motor to control the course of the ship , and feed back the position, speed and rudder angle of the ship in real time. The invention aims at adopting the fuzzy PID control algorithm to realize the self-adaptive control of the ship steering gear.

The invention discloses a three-phase power grid disturbance generating device and a control method thereof. The device comprises a three-phase multi-winding transformer, a power module array and an output filter which are connected sequentially, wherein the power module array comprises three groups of power modules corresponding to three-phase output; each power module comprises a three-phase PWM (pulse-width modulation) rectifier, a DC (direct-current) bus link and a single-phase H-bridge inverter which are connected sequentially; input of the three-phase PWM rectifiers is connected with secondary-side three-phase windings corresponding to the three-phase multi-winding transformer; each DC bus link comprises a DC capacitor group; output ends of the single-phase H-bridge inverters are cascaded to form device basic output; each group of power modules comprise at least one low-frequency disturbance generating power module for outputting fundamental waves or outputting the fundamental waves and harmonic waves as well as at least one high-frequency disturbance generating power module for outputting the harmonic waves. The device is controlled with the method. According to the method, the switching frequency of the at least one high-frequency disturbance generating power module is controlled to be not smaller than that of the at least one low-frequency disturbance generating power module. The device is small in size, low in cost and capable of meeting mobile, vehicle-mounted and on-site detection requirements.

The invention discloses a temperature drift compensation method and a temperature drift compensation device of a gyroscope. The gyroscope is arranged in a terminal device. The temperature drift compensation method of the gyroscope includes: after starting the terminal device, collecting temperature data of the gyroscope, and using the gyroscope to collect corresponding multiple groups of gyroscope data; judging whether the terminal device is in a static state, and when judging out that the terminal device is in the static state, supplementing or updating the gyroscope data corresponding to specified temperature in real time and then saving the gyroscope data corresponding to the specified temperature by using the collected gyroscope data at present according to correspondence between temperature and the gyroscope data, saved in the terminal device; calculating calibration value of the supplemented or updated gyroscope data, and using the calibration value of the gyroscope data to compensate the collected gyroscope data. Compared with the prior art, the temperature drift compensation method and the temperature drift compensation device of the gyroscope improve output accuracy of the gyroscope and correct error caused by temperature drifts to the utmost by collecting the real-time gyroscope data and calculating the calibration value of the gyroscope based on the updated or supplemented gyroscope data.

The invention belongs to the technical field of test and measurement and particularly relates to a BP (Back Propagation) neural network based high-precision correction and test method for a resonance cylinder pressure sensor, aiming to increase the correction and test precision for the resonance cylinder pressure sensor. The method comprises the steps of: structuring a sensor BP neural network of a dual-implicit-strata network structure, wherein input variables of the network structure are respectively the output period T and the temperature voltage V of the sensor, and output variables of the network structure is the pressure value P; acquiring output periods and temperature voltages of the sensor at different temperature under different pressure input conditions; and collecting output quantities of the sensor at different temperature under different pressure conditions to serve as correction and test as well as inspection sample points. According to the method, with the dual-implicit-strata network structure, the number of network parameters is reduced while the output precision is guaranteed; and the correction and test precision of the resonance cylinder pressure sensor is increased by 25%, and the high-precision correction and test of the sensor is realized.

The invention provides quantitive slurry conveying equipment and a method for conveying slurry. The equipment can convey the slurry with a fixed slurry concentration. The equipment comprises a slurry mixing barrel 4, a quantitive powder conveying device, a stirring device 5, a solution metering device 6 and a slurry conveying device. The method for applying the equipment to convey the slurry comprises the following steps of continuously conveying a powdery substance and a liquid medium into a slurry mixing device in a cocurrent flow mode; and utilizing a spiral feeding device to continuously and quantitively convey the powdery substance, utilizing a flowmeter to continuously and quantitively convey the liquid medium, stirring and mixing in the slurry mixing device to form suspended slurry, continuously overflowing and outputting, and conveying the suspended slurry to an application position through the slurry conveying device. The equipment and the slurry conveying method can quantitively and continuously convey the slurry, are suitable for conveying a solid substance which has larger bulk specific gravity variation and is difficult to accurately control on the output quantity by depending on simple spiral feeding equipment, can also quantitively and remotely convey the slurry and are convenient for logistics management and safety operation.

The invention provides a shifting register unit. The unit comprises an input module, a pull-up module, a bootstrap module, a pull-up control module and a reset module, wherein the input module is connected with an input end and a pull-up node of the shifting register unit and is used for charging for the pull-up node when the input end receives effective signals; the pull-up module is connected with a first clock signal end, an output end and the pull-up node and is used for enabling the output end to be conductively connected with the first clock signal end when the pull-up node reaches an effective potential; two ends of the bootstrap module are connected with the pull-up node and the output end respectively; the pull-up control module is connected with the pull-up node and is used for discharging for the pull-up node when the potential of the pull-up node is higher than the effective potential; the reset module is connected with a reset end, the pull-up node, the output end and an invalid signal end and is used for enabling the pull-up node and the output end to be conductively connected with the invalid signal end when the reset end receives the effective signals. The invention further provides a driving method, grid driving circuit, and display device of the shifting register unit. The shifting register unit can prevent transistor characteristic drifting which is caused by excessive high potential of the pull-up node.

The invention discloses a calibration system and a calibration method of an alternating large current of a current transformer. The calibration system of the alternating large current of the current transformer comprises a large current sensing unit, a data collection unit and a personal computer (PC), wherein the large current sensing unit comprises an iron core coil, a hollow coil, a signal conditioning unit and a shielding case, the hollow coil and the signal conditioning unit are fixed inside the shielding case, the iron core coil, the hollow coil and the shielding case are respectively installed on a current-carrying wire, a first bypass wire is arranged between the iron coil and the hollow coil, and an output end of the signal conditioning unit is connected with the PC through the data collection unit. Mutual inductance coefficients of the installed hollow coil are calibrated through the iron core coil, whether a state of the hollow coil meets a calibration condition or not is judged, closed-loop control when calibration is conducted is finished through feedback of the mutual inductance coefficients of the hollow coil, the high-accuracy calibration on the alternating large current is achieved, and output accuracy of the current transformer with the hollow coil is ensured.

The invention discloses an arbitrary waveform generator amplitude frequency sweeping multi-scale calibration method and device. The intervals between calibration sampling points can be adjusted according to the fluctuation degree of errors, the intervals between the calibration sampling points are large when an error curve is smooth, the intervals between the calibration sampling points are smallwhen the error curve greatly fluctuates, and then calibration of different scales is achieved. The method includes the following steps that a frequency response error signal is acquired; the frequencyresponse error signal is subjected to windowing framing, and multiple frame signals are obtained; the energy mean value of each frame signal is calculated, an energy envelop of the frequency responseerror signal is obtained, and the mean value of the energy envelop of the frequency response error signal is calculated; the judgment threshold value of segmentation of the error signal and the intervals between the calibration sampling points are determined; calibration frequency bands of the frequency response error signal are segmented, and the intervals between the calibration sampling pointsand the number of the calibration sampling points in the corresponding frequency bands are determined; the corresponding frequency bands are calibrated through the calibration sampling points.

The invention discloses an intelligent pressure transmitter and a temperature compensation method thereof. The output ends of pressure and temperature sensors of the transmitter are connected with theinput end of a signal conditioning circuit of a microprocessor, a programmable current source of the microprocessor provides current-constant driving for the temperature sensor, a current type DAC module is connected with the microprocessor bidirectionally and outputs a current signal, and a communication module is connected with the microprocessor bidirectionally and outputs a pressure signal output by the microprocessor. The pressure transmitter is arranged in a high and low temperature box, and set high-temperature, normal-temperature and low-temperature points to collect sample data, temperature compensation is carried out on output nonlinearity of hot zero drift and hot sensitivity drift of the pressure sensor by means of data processing, and a temperature compensation combined pressure calculation formula is obtained. The transmitter is simple in structure and high in integrated degree, small signals can be amplified effectively, the method can be used to carry out temperature compensation on zero and sensitivity hot drift of the sensor, and the output precision of the transmitter in the total temperature range can be ensured.

The invention discloses a eulerian angle any step length orthogonal series approximation output method based on an angular speed, which is used for solving the technical problem that the eulerian angle output precision is poor when the existing aircraft maneuvers. The technical scheme is as follows: a plurality of parameters are introduced, the tumbling, the pitching and the jaw rate are developed and approximated by adopting the improved recurrence mode similar to Chebyshev orthogonal polynomial, according to the pitching angle, the tumbling angle and the yaw angle, the high-order approximate integration is conducted on the eulerian angle expression directly, the solution of the eulerian angle linear approximated linearly according to superlinearity, and the determination of the time update iterative computation accuracy of the eulerian angle can be ensured, so that the accuracy of the flight attitude output by inertia equipment can be improved.

The invention relates to a high-precision large-pressure-reduction-ratio automatic pressure-regulating gas pressure-stabilizing and pressure-reducing combined valve. A two-stage pressure-reducing structure is adopted, and high-precision output of pressure is achieved. A mechanical pressure-reducing valve is adopted for the first stage, and an electrical proportional pressure-reducing valve is adopted for the second stage. A reverse unloading type main body structure is adopted for the first-stage pressure-reducing valve, the pressure force of falling-in opening pressure acting on a valve is balanced, and thus the influence of gas source pressure fluctuation is reduced; and for the problem of high upstream pressure, a metal diaphragm type structure is adopted for the first-stage pressure-reducing valve, and thus the pressure resistance is improved. A main body form of an electromagnetic proportional valve is adopted for the second-stage pressure-reducing valve, a reverse unloading type structure is adopted for a valve body, and thus interference of inlet pressure is further reduced; and meanwhile, a driving element of a proportional electromagnet is adopted, and thus the stability of output pressure is ensured on the premise of ensuring the flow.

The invention belongs to the technical field of height adjustment of coal mining machines, and provides a proportional control system applied to height adjustment of a coal mining machine for improving the height adjustment precision of the coal mining machine and realizing intelligent shape cutting. The proportional control system comprises a control center, a proportional controller, a proportional valve bank, a rotary encoder and a travel sensor, wherein the rotary encoder is arranged on a rocker arm of the coal mining machine; the travel sensor is connected with a telescopic cylinder of the rocker arm of the coal mining machine; the rotary encoder and the travel sensor are connected with the control center; the proportional valve bank is connected with the telescopic cylinder of the rocker arm of the coal mining machine; the control center drives the proportional controller; and the proportional controller controls the proportional valve bank. According to the proportional control system, a proportional reversing valve and a PID (Proportion Integration Differentiation) controller substitute a switching value valve bank, and the rotary encoder substitutes a cylinder travel sensor to serve a sensing device, so that the final whole height adjustment effect meets the precision requirements of various functions of intelligent coal mining machines by simultaneously improving the precision of the controller and the sensor.

The invention relates to a beam evaluation method for boron neutron capture therapy, a beam evaluation device for boron neutron capture therapy, an apparatus and a storage medium. The method includesthe following steps that: a neutron energy spectrum to be evaluated and a photon energy spectrum to be evaluated in an epithermal neutron beam are separately divided into a plurality of sub-energy-spectrum intervals; the fluence of the sub-energy-spectrum intervals in the neutron energy spectrum to be evaluated is obtained and is adopted as first fluence, and the fluence of the sub-energy-spectrumintervals in the photon energy spectrum to be evaluated is obtained and is adopted as second fluence; the first fluence is substituted into a first depth dose formula and a second depth dose formulaseparately, so that first curve data and second curve data are obtained, and the second fluence is substituted into a third depth dose formula, so that third curve data are obtained; and dominant depth and treatment gain are determined according to the first curve data, the second curve data and the third curve data, so that the therapeutic effect of the epithermal neutron beam is determined. Withthe beam evaluation method for boron neutron capture therapy, the beam evaluation device for boron neutron capture therapy, the apparatus and the storage medium adopted, the evaluation effectivenessof the therapeutic effect of the epithermal neutron beam can be effectively improved, and a neutron shaping device can be quickly adjusted.

The present invention provides a superposed operation circuit and a floating voltage digital-to-analog conversion circuit, and adopts the principle of superposition of indirect current to realize the superposition of analog quantities. The negative phase input end and the output end of a first operational amplifier are connected to make the first operational amplifier possess the characteristics of a voltage follower and its output end clamped to the voltage inputted from the positive-phase input end, that is, the analog quantity to be superimposed. Then, a current generating circuit converts a voltage signal into a current signal, wherein the current signal produces a voltage drop across a first resistor connected to the output end of the first operational amplifier. The voltage drop is superimposed with the voltage signal outputted by the first operational amplifier. Therefore, the output operation point of the first operational amplifier in the superposed operation circuit is always fixed to the analog quantities to be superimposed, thereby ensuring the output precision of the operational amplifier. Furthermore, the high-precision current superposed quantity is obtained from the conversion of the low absolute precision voltage signal instead of being generated directly from the digital-to-analog conversion circuit, relaxing the input accuracy of the current generating circuit and further reducing the requirement of the current generating circuit on power consumption and the size.

The embodiment of the invention discloses a beam evaluation method apparatus, and equipment for boron neutron capture therapy, and a storage medium. The method comprises the following steps: acquiringa neutron energy spectrum to be evaluated and a photon energy spectrum to be evaluated in the same epithermal neutron beam; inputting energy values of a plurality of sets of monoenergetic neutrons inthe neutron energy spectrum to be evaluated into a first depth dose model and a second depth dose model, to obtain a plurality of sets of first curve data and a plurality of sets of second curve data, and sequentially inputting energy values of a plurality of sets of single-energy photons in the photon energy spectrum to be evaluated into a third depth dose model to obtain a plurality of sets ofthird curve data; through the plurality of sets of first curve data, determining the plurality of sets of second curve data and the plurality of sets of third curve data, the dominant depth and the therapeutic gain to evaluate the therapeutic effect of the epithermal neutron beam, so that the evaluation efficiency of the therapeutic effect of the epithermal neutron beam is effectively improved, and the beneficial effect of the rapid adjustment of the neutron shaping device is realized.

The invention relates to a current source based on zero flux current closed loop feedback, and belongs to the technical field of power sources, solving the problem that the stability and accuracy of the existing high-power current source cannot meet requirements. The power source comprises an input loop, an adjustment loop, an output loop and an annular magnetic core; magnetic flow in the annularmagnetic core is adjusted via the adjustment loop, so that the input magnetic flow generated by the input loop and the feedback magnetic flow generated by the output loop are balanced, the current ofthe output loop is kept constant, and the size of the output current in the output loop can be controlled through controlling the number of ampere turns in the input loop. According to the current source provided by the invention, the current adjustment control method is relatively simple, the high-power current accuracy can be ensured, and the output accuracy of the power source is improved.

The invention discloses a thermal stress balance predictive control method and system suitable for a multi-level converter, and relates to a power electronic converter control technology. The thermalstress balance predictive control method comprises the following steps: firstly, a cost function is constructed according to a control variable reference value and a control variable output predictionvalue, and an optimal total output level and a level increment are determined; secondly, modules capable of acting are determined according to the level increment; and finally, a switch distributionfunction is designed according to the junction temperature value, modules needing to act are determined, and the level increment is distributed to the modules needing to act. In the control method, the cost function is designed according to the output prediction value and is not corrected, and the output precision is ensured. The switch distribution function is designed based on the junction temperature value for reflecting the thermal stress of each module, the switching states of modules are determined through the switch distribution function, and an effect of multi-module thermal stress balance is achieved.

The invention relates to the technical field of pressure sensors, and discloses a pressure sensor with a medium isolation measurement module. The pressure sensor sequentially comprises a protective cover, a first housing and a medium isolation module from top to bottom, wherein the medium isolation module comprises a base. According to the pressure sensor with the medium isolation measurement module, a first cavity is formed among the base, a metal piece and a diaphragm to isolate and package silicone oil; a pressure chip is isolated and packaged for protection to prevent direct contact with adetection medium, and corrosion is avoided; a buffer hollow cylinder and the diaphragm are isolated by a limiting circular ring, and accumulated liquid can be rapidly discharged in real time, so thatthe diaphragm is prevented from being damaged by freezing, and the output precision of the sensor can be ensured; the increase of the freezing volume of the detection medium at a low temperature is avoided, the change of the volume can be absorbed by the buffer hollow cylinder, and the purpose of high compatibility is achieved; and overload pressure generated by freezing of a urea solution can beresisted and freezing damage is prevented, and meanwhile, high-precision output is ensured.

This invention relates to a two-way 4-20mA DC analog volume output device based on FPGA control different from the circuit controlling single DAC chips with the SPI interface of a master CPU, which can simulate two-way SPI communication line by the IO interface of FPGA and converts parallel digital information given by the master CPU to a serial digital flow required by the DAC and outputs it to realize DC analog volume output of 4-20mA, and the device is composed of a high speed optical isolator, a D/A converter, an operational amplifier and a voltage primary source, in which, the high speed optical isolator, the D/A converter and the operational amplifier are serial in sequence, the voltage primary source is connected with the converter and the amplifier, the input of the isolator is the input of the device and the output of the amplifier is the output of the device.

The invention provides a large-current pulse power supply output calibration method and device, and electronic equipment. The method is applied to an ATE equipped with a universal meter, a voltage and current source and a load. The load is connected with a voltage measuring unit and a current measuring unit; determining a target resistor in the load according to the to-be-calibrated voltage gear and the to-be-calibrated large current gear, controlling the universal meter to measure the resistance value of the target resistor, and calibrating the voltage measurement unit based on the to-be-calibrated voltage gear; switching the voltage and current source to a to-be-calibrated large current gear; the gears correspond to a plurality of calibration point current values; based on the current measurement unit, the calibrated voltage measurement unit and the resistance value, determining corresponding actual current values and measured current values when the voltage and current source outputs the current values of the plurality of calibration points; and calculating a calibration coefficient corresponding to the to-be-calibrated large-current gear. The method is easy to implement and low in cost, can traverse the whole large-current gear range, can ensure the output precision of the large-current gear full range, and meets the high-precision calibration requirement.

The invention discloses an acceleration signal conversion method, a servo circuit and a quartz flexible accelerometer, and the method comprises the following steps: receiving a differential capacitance signal of a quartz meter head, converting the differential capacitance signal into a voltage signal, and converting the voltage signal into a digital signal; collecting temperature field information in the accelerometer and converting the temperature field information into a digital signal; and performing high-order nonlinearity and temperature drift coefficient calibration compensation on the digital signal to obtain an acceleration digital signal, leading out the acceleration digital signal through a serial port, outputting the acceleration digital signal to the outside, completing acceleration signal conversion, converting the output digital signal into an analog signal, and connecting the analog signal to a feedback loop after amplification and compensation to form a closed-loop control system. The size of the inertial measurement system can be greatly reduced, the detection precision of the inertial measurement system is effectively improved, long-line transmission is avoided, noise interference is reduced, temperature information and voltage signals are converted into digital signals for calibration compensation, the output precision of the accelerometer can be greatly improved, and the zero-bias stability is improved.

The invention relates to the laser field, in particular to a carbon dioxide laser with a novel positive electrode structure. The carbon dioxide laser with the novel positive electrode structure comprises a gas storage pipe, a water cooling pipe and a discharging pipe which are arranged in sequence from the outside to the inside in a sleeve mode, the discharging pipe is provided with a positive electrode and a negative electrode and further provided with an anode chamber, the positive electrode is arranged in the anode chamber, the end of the positive electrode near the negative electrode is the discharging end, the discharging end of the positive electrode is separated from the inner wall of the anode chamber, and the discharging end of the positive electrode is further separated from the end of the water cooling pipe. The carbon dioxide laser with the novel positive electrode structure enables the irregular deformation amount of each of the anode chamber and the water cooling pipe to be weakened so that the pull on the gas storage pipe is weakened, and accordingly the influence on the alignment precision of an output lens and a reflecting lens is reduced, and the output precision of the laser is guaranteed.

The invention discloses a vertical machine tool high-speed spindle system with excellent thermal stability. The vertical machine tool high-speed spindle system is characterized in that a shaft sleeve is fixed on a box body, a vertical spindle is fixed with a bearing, and a pull rod is sleeved in the vertical spindle; a transmission gear shaft is vertical, tooth grooves are formed between adjacent gear teeth, and a boss is arranged in the middle of the upper end of a gear body and is internally provided with a center hole; an oil storage tank is arranged at the outer side of the boss, and a plurality of oil guide channels communicated with the tooth grooves are arranged on the side wall close to the gear teeth. A reverse buckling disc of a main shaft buffering connecting structure is fixed to the vertical main shaft, a floating connecting ring sleeves the vertical main shaft between the end face of a box body and the inner side face of the reverse buckling disc, and an axial gap is formed between the outer side face of the floating connecting ring and the inner side face of the reverse buckling disc. A floating guide rod penetrates through a through hole I of the floating connecting ring and is fixed with the box body, a compression spring sleeves the floating guide rod between the outer side surface of the floating connecting ring and a nail head of the floating guide rod, and the lower end of a floating end cover is fixed with the floating connecting ring and is also fixedly connected with the cylinder body of a notching cylinder. The vertical machine tool high-speed spindle system has the characteristics that the structure is simple, the thermal stability is excellent, the vibration is small, the service life of the bearing is long, and the reliability is high.