688results about How to "Improve output accuracy" patented technology

The invention relates to a magnetic suspension controlled moment gyro with double frames, essentially consisting of a flywheel, an inner frame system and an outer frame system. The flywheel is arranged in the middle of the magnetic suspension controlled moment gyro with the double frames and essentially comprises a rotary shaft, a radial mixed magnetic bearing, an axial magnetic bearing, a radial displacement sensor, an axial displacement sensor, a high-speed motor and a gyro room; the inner frame system and the outer frame system essentially comprise the frames, a mechanical bearing, a moment motor, a reducer, an angle position sensor, a conductive slip ring a control system; the inner frame system is connected with a shaft hole on one end of the gyro room through the reducer and at the same time the conductive slip ring and the angle position sensor are connected with the shaft hole on the other end of the gyro room; the outer frame system is connected with a shaft hole on one end of the inner frame through the reducer and at the same time the conductive slip ring and the angle position sensor are connected with the shaft hole on the other end of the inner frame. The invention reduces noise, size and weight of the system through the mixed magnetic bearing, and eliminates bearing friction, and thus prolongs life span and promotes control accuracy of the controlled moment gyro.

The invention discloses an air-quality monitoring system based on electronic nose technique, and a monitoring method thereof. The system is characterized by being provided with a sensor signal conditioning circuit, wherein a quality detection input end group of the sensor signal conditioning circuit is connected to a gas sensor group; the output end of the sensor signal conditioning circuit is connected to a sensor array signal preprocessor; the output end of the sensor array signal preprocessor is connected to a central processing unit; and a display end of the central processing unit is connected to a display. The system has the advantages that the discreteness problem of a metallic oxide sensor and the mutual interference problem of various gases are better solved by utilizing a virtual resistance method and a specific algorithm provided by the invention, thereby greatly promoting the output precision of the system, being capable of calculating the concentration values of different outputted gases, and determining the type of the gases, and simultaneously finishing the qualitative and quantitative identification of gases, and one output of an artificial neural network represents one gas.

The invention provides a lithium iron phosphate battery modeling and SOC estimating method in account of capacity loss. The method is provided based on the facts that the working state of the existing lithium iron phosphate battery is influenced by many factors of temperature, current, cycle times, depth of discharge and the like, and thus the modeling process is very complicated. According to the method, based on the Thevenin equivalent circuit, the modeling work is conducted on the lithium iron phosphate battery; the model open-circuit voltage, resistance and capacitance value identification method are given; and the capacity loss of the lithium iron phosphate battery in the life cycle is taken into account; a capacity estimation mathematical model is established; the output precision of a lithium iron phosphate battery model is improved; and the lithium iron phosphate battery SOC estimating problem brought by uncertainty noise is solved with extended Kalman filtering (EKF) algorithm. The method has the advantages of being simple, scientific and reasonable, high in application value, good in effect and the like.

A piezoelectric clamping micromanipulator with flexible drive and amplification and adjustable range is composed of microactuator, flexible multiplying mechanism, size pre-regulator, and clamping micromanipulator. Its advantages are compact structure, high reliability, and low non-linear error.

The invention relates to a crosshead shoes driving reducer for a multi-joint robot. The crosshead shoe driving reducer for the multi-joint robot comprises input shafts, output shafts, reducer bodies, crosshead shoes, transmission balls, track controllers and drive balls. The input shafts, the crosshead shoes, the track controllers and the output shaft are installed in the reducer bodies. Transmission tracks used for the installation of the transmission balls are arranged in the crosshead shoes. The transmission balls move in the transmission tracks to convey the movement of the input shafts to the track controllers. Moving track used for the installation of the drive balls are arranged on the lower surfaces of the track controllers. The track controllers adjust the output of the output shafts through the drive balls. According to the crosshead shoe driving reducer for the multi-joint robot, automatic adjustment for complete consistency of movement and eccentric magnitude of an eccentric shaft is achieved, the tracks of the transmission balls and the tracks of the track controllers of the reducer are completely consistent, the output of the reducer is stable, and the mechanical wear rate is low.

The invention discloses a fiber optic gyro framework designed according to sectorization, comprising an upper cover (2), a framework body (1), a magnetic shield (4), a front-laid cover (5) and a lower cover (3); the upper cover (2) is connected to a B cone frustum (12) of the framework body (1) by threads, the front-laid cover (5) is mounted on an L-shape clapboard (104) in the framework body (1), the magnetic shield (4) is positioned between the framework body (1) and the lower cover (3), and the lower cover (3) is mounted at the lower end of the framework body (1). The framework body (1) designed by the invention is laid out with regions according to the functions realized by an element to be placed, the framework body (1) under intact construction is divided into an upper layer cavity (16A) and a lower layer cavity (16B) by a cavity separating plate (16), the upper layer cavity (16A) is mainly used for placing elements with optical fiber such as an SLD light source (1G), a coupler (1H), a Y waveguide (1F), a photoelectric detector (1E) as well as a light source drive circuit (1B), a front-laid circuit (1J) and the like; and the lower layer cavity (16B) is used for placing the magnetic shield (4) and signal circuit (1C).

The invention belongs to the technical field of metering pumps, and particularly relates to the flow compensation technology of a digital frequency conversion metering pump. The flow compensation technology is characterized by comprising a method for determining and compensating for the error of manufacturing accuracy, a method for determining and compensating for rotate speed and outlet pressure, a method for determining and compensating for fluid viscosity coefficients and a method for determining and compensating for working hours. In the technology, error values of theoretical displacement caused by four factors of the manufacturing accuracy, the rotate speed and outlet pressure, the fluid viscosity coefficients and the working hours are calculated, and the theoretical displacement is compensated for according to the error values to obtain accurate actual displacement finally, so that the flow is calculated accurately by using the actual displacement in actual flow control; and in the technology, the manufacturing accuracy, the rotate speed and outlet pressure, the fluid viscosity coefficients and the working hours which influence the output displacement of the metering pump can be compensated, so the output accuracy of the metering pump is improved effectively, and the accurate constant-ratio addition of fluid is realized.

The invention discloses a gesture output compensation method of a single-axial rotary inertial navigation system. The method comprises the following steps: deducting the rotational angular velocity of the earth and gyroscopic drift from angular velocity output by a top z and integrating to obtain an angle; making a difference between the angle of the integral of the top z and a rotating angle output by a coded disc and fitting the difference value to configure compensation quantity of the course angle; deducting gravity acceleration projection from output of x and y accelerometers and angle of pitch and roll angle obtained by initial alignment so as to configure compensation quantity of the angle of pitch and the roll angle; and compensating the gesture output of the single-axial rotary inertial navigation system according to a gesture output compensation algorithm. The gesture output compensation algorithm is easy to implement, and not only can satisfy the real-time requirement of project application, but also can greatly enhance the gesture output precision of the single-axial rotary inertial navigation system, so that the method is of important meaning to improvement of navigation performance of the single-axial rotary inertial navigation system.

The invention discloses a magnetometer real-time correction device and method. The method comprises the following steps: firstly analyzing magnetometer error interference source features, then analyzing geomagnetic field distribution features and magnetometer measurement principles, subsequently designing the real-time correction device and simultaneously providing the corresponding correction method and process and finally realizing real-time correction and compensation on a course angle of a navigation system in a system level. According to the magnetometer real-time correction device and method, under the situation that the navigation system continuously works, the real-time automatic correction can be realized; meanwhile, the defects of conventional correction and compensation methods (such as an ellipsoid fitting method and the like) are avoided, and the magnetometer error correction can be autonomously, independently and completely realized. The magnetometer real-time correction device and method have the advantages that the course angle of the navigation system is corrected in real time, the error is more completely considered, the correction device is simple, the anti-interference performance is strong, the cost is low, the accuracy is high, and the processing of the calculation process is concise.

The invention discloses a lever-amplification-principle-based dual-shaft full-decoupling silicone micro-resonator type accelerometer comprising an upper layer and a lower layer. A mechanical structure of a silicone micro accelerometer is arranged at the upper layer and a glass substrate laid with a signal lead is arranged at the lower layer. The mechanical structure is formed by a sensing mass, a common anchor point, lever amplifier mechanisms, decoupling beams, and resonators; one end of one decoupling beam is connected with the sensing mass and the other end is connected with the common anchor point by the lever amplifier mechanisms; and the inertia force applied to the sensing mass is magnified by the lever amplifier mechanisms and then is transmitted to the resonators. The resonators consist of resonance beams, comb racks, movable combs, fixed drive combs, fixed drive feedback combs, and fixed anchor points. According to the silicone micro-resonator type accelerometer, accelerated speed detection at two directions in a plane can be realized; and the frequency is used as an output. The accelerometer has advantages of small size, high integration degree, small coupling error, high sensitivity, and excellent anti-interference capability and the like.

The invention discloses a photovoltaic grid-connected inverter and a control method of the photovoltaic grid-connected inverter. The photovoltaic grid-connected inverter comprises a maximum power point tracking module, a power switch tube object, an equivalent filter, a phase-locked loop, an electric grid disturbance measurement module, a current transducer, a voltage transducer and a BP (Back Propagation) nerve network control module, wherein the output end of the voltage transducer is connected to the input end of the phase-locked loop; the BP nerve network control module is respectively connected with the output end of the maximum power point tracking module and the phase-locked loop, the output end of the electric grid disturbance measurement module and the output end of the current transducer, which are used as three input ends of the BP nerve network control module; the output end of the BP nerve network control module is connected with the input end of the power switch tube object; and the output end of the power switch tube object is connected with the input end of the equivalent filter. The photovoltaic grid-connected inverter is higher in intelligent and output precision and is capable of adapting various electric grid environments and improving the stability and the reliability of a photovoltaic grid-connected power generation system.

The invention relates to a high-speed high-precision built-in dynamic and static piezoelectric main shaft. The high-speed high-precision built-in dynamic and static piezoelectric main shaft is characterized in that the main shaft comprises a box body, a front bearing and a rear bearing are arranged in the box body through a front bearing end cover and a rear bearing end cover correspondingly, and the front bearing and the rear bearing jointly bear a main shaft body internally provided with an online dynamic balancing head; the box body is provided with an oil inlet and an oil outlet, the oil inlet communicates with the oil outlet through an oil way, the oil way is divided into two parts, and one part enters the front bearing and the rear bearing through the oil inlet to suspend the main shaft body in a gap between the front bearing and the rear bearing to form pure liquid lubrication; and the other part is fed to the front bearing and the front bearing end cover to make the main shaft body achieve axial positioning, and a grinding wheel is arranged on the front bearing end cover through a flange disc. The high-speed high precision built-in dynamic and static piezoelectric main shaft is simple in structure, good in dynamic performance, large in rotation number of the main shaft, high in rotation precision and small in heat deformation and can be widely applied to grinding wheel electric main shafts of precise grinding machines, main shafts of numerical control machining centers and precise lathes and the like.

The invention relates to a two-stage jet nozzles series super-magnetostrictive jet servo valve and an operating method thereof, which belong to the field of a hydraulic servo control technique. The two-stage jet nozzles series super-magnetostrictive jet servo valve provided by the invention comprises an upper end cover (4), a lower end cover (26), a super-magnetostrictive rod (14), an output rod (21), a coil skeleton (8), a polarization magnetic filed generating unit and a driving magnetic field generating unit, wherein the upper end cover (26) is provided with a left valve core installation cavity (45) and a right valve core installation cavity (46) which are symmetrical relative to the axis of the output rod; a group of valve core components are respectively installed in the left valve core installation cavity (45) and the right valve core installation cavity (46); and wedge-shaped amplification mechanisms are formed in the contact positions of the output rod (21) and the left and the right valve core installation cavities. The two-stage jet nozzles series super-magnetostrictive jet servo valve provided by the invention has the advantages of great pressure gain and rapid response, and the driving part has the obvious characteristics of small heat radiation, adjustable polarization magnetic filed, intelligentized effect and the like.

The present invention is intended to provide a force sensor that converts a force into capacitance and makes it possible to generate a plurality of outputs with different output characteristics, force detection system, and a force detection program for it. The force sensor 20 has a displacement unit 24 for generating a displacement when a force is applied; a single or a plurality of first sensor units (36, 36A, 36B, 36C, and 36D) for generating a first output C1 from said displacement of the displacement unit; and a second sensor unit 44, which is annexed to the first sensor unit, for generating a second output C2 from the displacement of said displacement unit. The force detection system enhances the output accuracy by means of the first and second outputs of such a force sensor. The force detection program is used in the force detection system for executing the output process.

The invention relates to a dynamic correction circuit for the current source of a current-steering digital-to-analog convertor. The current source comprises multiple groups of current source modules, each current source module comprises a first MOS (metal oxide semiconductor) tube unit and a second MOS tube unit which are connected in series; the first MOS tube unit comprises a plurality of first MOS tubes connected in parallel, and the source electrodes and drain electrodes of the first MOS tubes are respectively connected to form the source electrode and drain electrode of the first MOS tube unit; the source electrode of the first MOS tube unit is connected with an external power supply; and the correction circuit is composed of a feedback control module as well as a correction MOS tube subunit, a capacitor and a switch which are arranged in each group of current source modules. The dynamic correction circuit is used for dynamically correcting the current source to stabilize the current source basically so as to obtain a digital-to-analog convertor with better properties.

The invention discloses a BS speed reducer, comprising an input shaft, an input shaft cover, a gap adjusting screw, a machine body, a fixing plate, a driving plate, a rolling bead, an output shaft and an output shaft cover. The BS speed reducer is characterized in that the machine body is internally provided with the input shaft, the fixing plate, the driving plate and the output shaft; S-shaped cycloid grooves are arranged on the two side faces of the fixing plate, and the driving plate is matched with S-shaped cycloid grooves which are arranged at one side of each of the input shaft cover and the output shaft; the input shaft cover is connected with the fixing plate; rolling beads are placed into the S-shaped cycloid grooves between the input shaft cover and the fixing plate, between the fixing plate and the driving plate, as well as between the driving plate and the output shaft cover; and the gap adjusting screw is arranged on the input shaft cover. The speed reducer has the advantages of compact structure, small volume, light weight, zero gap, low noises, large transmission power and stable and reliable transmission; and the transmission efficiency can reach to 88-93%. The speed reducer adopts two groups of S-shaped cycloid differential motions to realize the speed reduction and can completely change the speed reducing principle of the traditional speed change which utilizes a gear or a worm wheel tooth number to change the speed.

The invention belongs to the technical field of sensors, aims at solving the problem that existing differential transformer type displacement sensors are poor in linearity and low in accuracy and provides a differential transformer type displacement sensor which comprises a primary coil, secondary coils and a framework. The framework is of a cylindrical structure, the primary coil and the secondary coils are wound on the framework, and magnetic conductors are arranged on the framework and are symmetric according to central axis of the framework. When an iron core of the differential transformer type displacement sensor moves in a direction being close to the secondary coils, the magnetic conductors enable magnetic flux passing the secondary coils to be increased greatly, so that magnetic field distribution in the differential transformer type displacement sensor is improved and enabled to be more uniform; a sum of magnetic flux increment of the secondary coils is ensured to be similar to linear changing, so that linearity and output accuracy of the differential transformer type displacement sensor are improved while linear stroke of the same is increased.

The invention relates to a charge-discharge control method and system of an energy storage system. The method comprises following steps: collecting the scheduling data and theoretical output value ofa photovoltaic power station, determining a light discarding period, a tracing plan period, a light discarding control strategy, and a tracing plan control strategy; during the light discarding period, executing the light discarding control strategy; and during the tracing plan period, executing the tracing plan control strategy. The discharge and charge of an energy storage system is realized. The method can improve the on-grid energy of a photovoltaic power station and reduce the measurement cost generated by insufficient tracing precision and thus greatly increases the profits of the photovoltaic power station.

The invention relates to a permanent magnet synchronous motor control method, in particular to a built-in permanent magnet synchronous motor control method. The problem that motor parameters are not accurately used in real time in an existing permanent magnet synchronous motor control method, so that the motor output torque precision and the motor operation efficiency are affected is solved. According to the control method, the influence of temperature change and the motor saturation effect on the motor parameters is considered online at the same time, and the accuracy of the parameters of themotor at each working point is improved. According to the invention, based on the motor temperature t, the current amplitude is, the current vector angle beta on-line real-time table lookup and the MTPA real-time table lookup on the feedforward channel, the flux linkage is calculated in real time by using the flux linkage calculation model on the feedback channel, so that rotor temperature detection equipment is omitted; and d-axis current and q-axis current are redistributed by utilizing an output result of a torque closed loop, so that the permanent magnet synchronous motor is maintained tooperate according to an MTPA track, and the heating and loss of the motor are reduced.

Operating speed as well as output accuracy of a D-A converter is enhanced. With a semiconductor device including unit current sources, and unit current source switches, plural current source elements constituting each of the unit current sources are disposed so as to be evenly dispersed, thereby reducing errors of the current source element, dependent on distance while the unit current source switches are concentratedly disposed in a small region, thereby mitigating delay in operation, attributable to parasitic capacitance. In addition, with the semiconductor device including R2R resistance ladders, the R2R resistance ladder is provided on the positive and the negative of each of the unit current source switches, and the respective R2R resistance ladders are shorted with each other at respective nodes on a unit current source switch-by-unit current source switch basis, are rendered identical in length, thereby cancelling out a nonlinearity error attributable to wiring parasitic resistance.

A multi-mode-control configurable-type complementary on-chip negative voltage charge pump circuit comprises a logical unit, a control unit, a reference voltage generating unit, a feedback resistor, a charge pump unit, a switch unit, a non-overlapping clock generation unit and a grounding protection unit. The logical unit is connected to a system enabling signal end and a charge pump enabling signal end. The control unit comprises a first control unit and a second control unit. The first control unit is connected to the charge pump enabling signal end, a bias current input end, an input voltage selection signal end and a reference voltage generation unit signal output end. The charge pump unit comprises a first charge pump and a second charge pump which are arranged in parallel. The first charge pump and the second charge pump are connected to an output signal of the non-overlapping clock generation unit in a complementary state. The switch unit comprises a first switch unit and a second switch unit which are arranged in series. An output end of the second switch unit is connected to the grounding protection unit and a ground wire respectively. By using the circuit of the invention, a voltage ripple can be restrained and an output voltage can be configured flexibly.

The invention relates to a self-adaptive inverse control method of a piezoelectric driver. The method includes the following steps: establishing a non-linear mathematic model of output displacements and input voltages of a piezoelectric driver off-line according to a hysteretic non-linear relationship of the piezoelectric driver; according to the established non-linear mathematic model, calculating an inverse model of the piezoelectric driver and taking the inverse model as an initial inverse controller to drive the piezoelectric driver; calculating actual output displacements and input voltages of the piezoelectric driver when the piezoelectric driver is running on-line; identifying model parameters on-line through a self-adaptive algorithm, and obtaining a model during on-line running of the driver and calculating the inverse model of the driver; and according to the calculated parameters of the inverse model, replacing original parameters in a controller of the piezoelectric driver and updating the parameters on-line. The influence of parameter uncertainty of the model, unknown interference and other reasons is effectively overcome. Compared with a pure inverse model, the inverse model of the invention has the advantages that the control precision is greatly increased, and the inverse model is suitable for piezoelectric drivers with different models and different specifications.

The embodiment of the invention provides a calibration method of gyroscope zero drift. The method comprises the steps that step 1, after a robot is started, the angular velocity of the gyroscope is read at each of the time intervals, in the reading process of the angular velocity, angular integration is conducted to obtain the angle of the gyroscope, and step 2 is executed; step 2, a zero drift value is determined according to the angular velocity read under the static condition of the gyroscope, and step 3 is executed; step 3, the zero drift value is subtracted from the angle of the gyroscopein the reading process to obtain the calibrated angle of the gyroscope. The method has the advantages of being simple and easy to implement, and the influence of the gyroscope zero drift value is solved to improve the accuracy of the data output of the gyroscope.

The invention relates to a numerical control direct current voltage source, which is a power supply. The voltage display (2) and a button (3) are respectively connected with the singlechip (1). The singlechip (1) is connected with the D / A converter (4) which is connected with the integrated operational amplifying circuit (5). The integrated operational amplifying circuit (5) is connected with an emitter follower (6) which is connected with a main power supply (7). An assistant power supply (8) is respectively connected with the D / A converter (4) and the singlechip (1).The singlechip is as the core, so the invention has high output precision and double overload protection and alarming function by means of digital adjustment and closed-loop realtime monitoring, and is particularly suitable for occasions with higher precision requirements.

The invention discloses a shielded open loop type magnetic gathering ring-free tunneling magnetoresistive sensor which comprises a sensor shell, and a U-shaped wire, tunneling magnetoresistors and a silicon steel sheet which are arranged in the sensor shell, wherein two sides of the U-shaped wire respectively serve as a to-be-detected current input end and a to-be-detected current output end; the tunneling magnetoresistors are respectively arranged under the two sides of the U-shaped wire; a parallel magnetic field parallel to the tunneling magnetoresistors is arranged in the induction direction of each tunneling magnetoresistor; the two tunneling magnetoresistors respectively induce a magnetic field generated by current in different directions on the two sides in the U-shaped wire, and two voltage signals are output; the silicon steel sheet is embedded in the sensor shell and is used for shielding external magnetic disturbance. According to the shielded open loop type magnetic gathering ring-free tunneling magnetoresistive sensor, the influence of temperature on the current sensor output is improved, the capacity of adapting a complex working environment through a current sensor is improved, the output accuracy of the current sensor is greatly improved in a whole temperature range, and the temperature characteristics are 7 times that of a traditional identical sensor.

The invention discloses a large-power arbitrary-waveform generation device and method. A DDS technology is adopted to realize a high-precision programmable-control function and an arbitrary-waveform generation function is realized on the basis of using an FPGA to realize DDS so that function indexes of large power and high precision and wide output range and arbitrary programmable control of waveforms and the like demanded in testing of a wide-band-gap semiconductor power device are satisfied and extremely high output precision and flexible output waveform control are achieved and thus a plurality of kinds of complex test demands of the wide-band-gap semiconductor power device can be met and test demands of the wide-band-gap semiconductor power device under conditions of high voltage, large current, high power and arbitrary waveforms are ensured finally. Through a practical test, a comparatively ideal result is obtained and invention design demands are completely met.

The invention relates to a sectional multi-order compensation high-precision voltage and current reference circuit which is used for generating stable reference voltage and current to provide voltage and current bias for other modules inside. The reference circuit is an on-chip circuit and comprises a basic band gap circuit, a low-temperature first-order negative temperature coefficient compensation circuit, a high-temperature high-order positive temperature coefficient compensation circuit, a voltage stabilization trimming circuit and a trimming logic circuit. Through sectional multi-order compensation of basic band gap voltage, the reference circuit has high temperature stability and is small in output deviation in a wide temperature range. By designing the trimming circuit, output bias caused by process deviation can be adjusted, so that precision of output voltage is further guaranteed. The reference circuit is simple in structure, high in precision and suitable for various analog integrated circuits.

A lossless equalization controller and a control method belong to the technical field of battery equalization control. The controller comprises a battery pack formed by a plurality of cells, an equalization switch control module, an equalization power control module, an equalization power transformation module, an equalization charging control module, a system power supply module and a master control module, wherein the system power supply module supplies power to the equalization switch control module, the equalization charging control module and the master control module. The controller has the advantages of rapid equalization speed, safe and reliable equalization process, low cost and easy promotion and application. The control method includes detecting battery equalization degree, equalizing laggard cells in the battery pack when the battery equalization degree is equal to or greater than 0.3%, detecting system fault, clearing system fault and other detection steps. The equalization precision is high, and the equalization process is safe and reliable.

The invention belongs to a pressure sensing technique and relates to circuit design of a high-accuracy pressure transmitter. In combination with the transmission characteristics of a piezoresistive SOI (Silicon on Insulator) pressure-sensitive device and a differential amplification circuit at different temperature conditions, the compensation of the temperature error of the output signal of the pressure transmitter is realized through a precision resistor network. Commonly used temperature compensation devices such as thermistors and diodes are not needed to be used in the circuit of the high-accuracy pressure transmitter, the temperature compensation of the pressure transmitter is realized only through four groups of precision fixed resistors and the errors of the pressure transmitter are reduced; and the applicable temperature range of the pressure transmitter which is designed by using the circuit is negative 55 DEG C to 175 DEG C and the output errors within the full temperature range are smaller than plus or minus 0.5% FS. The high-accuracy pressure transmitter has the advantages of small size, light weight, strong interference-resistant capability, stable output and simple and convenient technological process, and is suitable for large-scale production.