68results about How to "Short sampling period" patented technology

The invention discloses a self-adaptive fast power voltage regulation system. Two regulation strategies of dynamic voltage and frequency scaling (DVFS) and self-adaptive voltage scaling (AVS) are combined together, and are respectively achieved by two parts of DVFS fast coarse scaling and relatively slow AVS fine scaling. The system is characterized by comprising a main circuit system platform, a frequency regulator lock phase-locked loop RLL, an output power rail line PMOS switch block, an off-chip power management chip PMIC, a performance decision module, an on-chip hardware performance monitoring module, an on-chip DVFS control module and an on-chip AVS control module. According to the method and the self-adaptive fast power voltage regulation system, the working voltage and frequency of a chip are reduced at the same time, the margin of chip voltage is reduced, the influence of fast voltage changes is compensated, and the power consumption spending of the chip is reduced.

The invention discloses a performance diagnosis method for a fuel cell. The method comprises the following steps: introducing an impedance secant angular difference value delta alpha as a performancediagnosis judgment index of the fuel cell; using an improved electrochemical impedance spectroscopy method to solve to obtain the current impedance secant angle alpha t; at the same time, based on anestablished model, calculating to obtain a secant angle alpha 0 under the normal condition under the current density, temperature and humidity currently by a controller; and judging the current watermanagement state of the fuel cell by the controller according to the difference value delta alpha of the two secant angles, and generating a control signal to perform humidity adjustment on the fuel cell, so as to ensure that the fuel cell is in a normal working condition. The performance diagnosis method for the fuel cell provided by the invention can quickly and accurately judge the water management state of the fuel cell and recover the performance of the fuel cell under the condition of only using an alternating current signal generator and a data acquisition system, and improve the outputperformance of the fuel cell.

The invention discloses a ball bladder sampling device and a sampling method. The ball bladder sampling device comprises a flue (2), a sampling gun (1), a sucking pressure pump (3), an air intake and collecting pipe (4), a ball bladder, an air exhaust and collecting pipe (8) and an air sampling hose (9), wherein the sampling gun (1) is arranged at the section of the flue (2), the sucking pressure pump (3) is connected with the sampling gun (1), the air intake and collecting pipe (4) is connected with the sucking pressure pump (3), the ball bladder is connected with the air intake and collecting pipe (4), the air exhaust and collecting pipe (8) is connected with the ball bladder, and the air sampling hose (9) is connected with the air exhaust and collecting pipe (8) and extends outside a wall body (10). The sampling method utilizing the ball bladder sampling device comprises four steps. The sampling method adopts a way of double-ball-bladder sampling, and the ball bladder always keeps the positive pressure status, does not have a phenomenon of inleakage of air and does not need repeated self cleaning. The sampling period (the time needed by completing one-time ball bladder sampling) adopting the double-head ball bladder is saved by 85% compared with the single-head ball bladder sampling method. On the basis of simple operation and low use cost, the sampling method meets the sampling requirements for real time, accuracy and safety.

The invention discloses a large-flow sampling device for industrial flue gas particulate matters. The large-flow sampling device comprises a sampling gun, a filter device, a flow rate metering device, a diluting and cooling device, a water cooling device and a vortex gas pump which are connected through a pipeline in sequence, wherein the filter device comprises an upper taper cylinder and a lower cylinder which are symmetrically arranged up and down, the diameter of the upper tape cylinder is gradually increased from top to bottom, a supporting ring is clamped between the upper taper cylinder and the lower taper cylinder, a groove is formed in the bottom of the supporting ring, a filter film and a supporting plate of the filter film are arranged in the groove of the supporting ring from top to bottom in sequence, the filter film and the supporting plate are clamped and pressed between the upper taper cylinder and the supporting ring; the upper end of the upper taper cylinder is connected to the sampling gun through a hose I; the lower end of the lower taper cylinder is connected to the flow rate metering device through a hose II; the aperture ratio of the supporting plate is greater than 50%; an accumulative integrating instrument is attached to the flow rate metering device. The large-flow sampling device can be used for quickly realizing large-flow sampling of particulate matters of low-concentration emission source flue gas.

The invention relates to a PID control algorithm for double differential passages for a speed regulator of a water pumping and energy storing unit. The PID control algorithm comprises two differential passages with same structures. The sampling period of a first differential passage is comparatively short, while the sampling period of a second differential passage is comparatively long. The algorithm treats a quick change part and a slow change part of frequency separately, namely, adopting the first differential passage at the quick change part and adopting the second differential passage at the slow change part, so that a differential link functions within a wider regulating range all the time, and the rotating speed of the unit can have less fluctuation nearby a network frequency value. The PID control algorithm for the double differential passages effectively solves the problem that the prior PID control algorithm has larger differential dead area after discretization and the problem of effectively regulating narrow bandwidth, improves stability of the water pumping and energy storing unit during idle running at low water head, reduces influence of S-shaped characteristics to stable running of the water pumping and energy storing unit, and improves high-frequency interference inhibiting capability of the speed regulator of the water pumping and energy storing unit at the same time.

The invention provides a device for acquiring the voltage and current of a capacitive photovoltaic cell. The device comprises a sampling module, a voltage signal measuring module, a current signal measuring module, an MCU (Microprogrammed Control Unit) signal processing module and a manual gear selecting module, wherein the manual gear selecting module is used for selecting a measured gear according to the parameters of a measured photovoltaic cell, a gear selecting signal is sent to the voltage signal measuring module and the current signal measuring module through the MCU signal processing module to determine the measured gear; the sampling module samples the acquired voltage and current signals of the output end of the photovoltaic cell and respectively transmits to the voltage signal measuring module and the current signal measuring module for amplification and filtration processing, and the processed signal is sent to the MCU signal processing module to be processed and then uploaded to superior monitoring equipment for use. The device provided by the invention has the advantages of simple circuit structure, lower cost, high sampling accuracy, short sampling period and good working stability, and is convenient to operate.

The invention discloses an electric power system energy storage control method of large-scale photovoltaic access. The method comprises following steps that step 1, a photovoltaic power station is connected into a power transmission network and a power distribution network according to output voltage grade, a power-type energy storage system is configured in the power distribution network and an energy-type energy storage system is configured in the power distribution network; step 2, the power-type energy storage system adopts a double moving average algorithm to calculate an energy storage charging and discharging strategy, and stabilize short-time fluctuation of output power of the photovoltaic power station accessed to the power distribution network; and step 3, the energy-type energy storage system firstly carries out power generation detection on the photovoltaic power station accessed to the power transmission network and the power distribution network, carries out load prediction on the load accessed to the power distribution network so as to obtain a predicted photovoltaic output curve and a predicted load curve, then adopts a prediction control method, makes a daily operation plan, stores energy during photovoltaic power releasing period and generates power during load period at night.

The invention relates to the field of chemical industry manufacturing, and provides a method and device for rapidly judging the operation stability of a chemical industry production device. The method includes the steps of data acquisition, weight allocation, data collection, stable state criterion calculation, real-time data acquisition, data filtering, current stable state value calculation and stability judgment. The device comprises a weight allocation module, a data acquisition module, a data collection module, a data filtering module, a data calculation module and a judgment module. According to the method and device, weight allocation is performed, different variables are comprehensively considered, in a real-time database storage system, acquisition and storage of related data are achieved through a connector with the chemical industry production device, online high-pass filtering and low-pass filtering of key technology control points are achieved through the data filtering module, calculation of a stable state criterion value and a current stable state value is achieved through the data calculation module, and then whether a current operation state is a stable state or an unstable state is rapidly identified through the judgment module.

The invention discloses a method for sampling from long-axle workpieces by high frequency quenching metallographic examination, belonging to the technical field of electromechanical device manufacture and aiming to overcome the defect of the damage of the high frequency quenching metallographic examination in the traditional long-axle workpieces to the workpieces. In each bath production, a small block of material workpiece with the same material as the workpieces is taken as a sample; the excircle of the material workpiece is processed to the size completely same as that of the excircle of the workpiece; the material workpiece is arranged between two aluminum bars; after clamped with the sample, the overall dimension of the aluminum bars is ensured to be completely same as the size of an actual workpiece; in the intermediate-high quenching, an aluminum material does not generate magnetoelectric effect, thus the aluminum material can be reused; and the material of a workpiece sample clamped between the aluminum bars is same as that of the workpiece and parameters of the workpiece sample during quenching are also same as the parameters of the actual workpiece, thus the problem of batch workpieces can be found by analyzing the workpiece sample.

The invention discloses a harmonic current suppression method based on a 1.5-order hybrid repetitive controller, and the method comprises the steps: firstly building a magnetic suspension rotor kinetic model containing unbalance and sensor harmonic disturbance, and proposing a structure with three compensation channels connected in parallel by combining with fractional order repetitive control; according to the invention, odd harmonics and even harmonics can be independently eliminated by controlling a gain factor, only 0.5 N sampling periods are needed, the system delay is reduced, the dynamic response of the system is accelerated, the anti-interference performance of an algorithm is improved, and the suppression of the harmonic current of the system can be effectively realized.

The invention relates to a high-precision equal sampling system and method for harmonic measurement of a digital power meter, the high-precision equal sampling system comprises a power supply module, an operation processing module, a measurement control module and a plurality of sampling modules, the operation processing module, the measurement control module and the sampling modules are respectively connected with the power supply module, and the measurement control module is connected with the sampling modules. And the operation processing module is connected with the measurement control module. According to the high-precision equal sampling system and method for harmonic measurement of the digital power meter, the input signal is subjected to precise frequency multiplication output through the method, the sampling position in each period is precisely controlled, the quality of each characteristic sampling point is improved, the sampling period is shortened, the sampling speed and precision are improved, and the sampling efficiency is improved. Therefore, the harmonic measurement analysis requirement of the input signal is met.

The invention discloses a radon acquisition device and a method. The device comprises an acquisition box, an acquisition rack and a sealing box. The acquisition box is a cylindrical acquisition box. Two shaft end faces of the cylindrical acquisition box are formed by filtering nets. The interior of the cylindrical acquisition box is filled with activated carbon. The hole diameter of one net hole of each filtering net is smaller than the particular diameter of the activated carbon. The acquisition rack comprises a trapezoid base. The short edge of the trapezoid base is connected with a collecting rack wherein the acquisition box is embedded. The sealing box is used for sealing the acquisition box in the non-sampling state therein. The sealing box comprises a box body and a box cover. The box body and the box cover are in threaded connection with each other to form a sealing space. According to the invention, it is achieved that the acquisition box carries out double faced acquisition; the thickness of the acquisition box is proper; the shielding effect of outer layer activated carbon on the radon adsorption ability of the inner layer activated carbon can be neglected; the whole activated carbon can be allowed to uniformly absorb radon; and the accuracy of measurement results is improved.

The invention discloses a sparse GPS sampling point based method and device for fine moving track reduction. The method includes the following steps: step 1, collecting the station data and track dataof several shifts of public transport vehicles in the same line during operation through a vehicle terminal data acquisition unit; step 2, selecting one shift as a reference shift; step 3, constructing a track point model M for the track data according to the station data and the time parameters of the track data; step 4, judging whether a track point is a turn point; step 5, performing interpolation on the turn point; and step 6, performing interpolation on other track points. Through the method, effective bases can be provided for the management and decision of public transport companies, costs can be reduced, influences of weak GPS signals can be eliminated, and sampling periods can be greatly shortened; and a new precise line track can be generated through fast fitting by only drivingvehicles on a set track for several times.

The invention relates to an infrared touch screen circuit suitable for strong ambient light. The infrared touch screen circuit comprises a plurality of controlled infrared luminous sources, a plurality of infrared receiving sensors and signal processing circuits thereof corresponding to the controlled infrared luminous sources, and a main controller, wherein the main controller is independently connected with the controlled infrared luminous sources and the infrared receiving sensors and signal processing circuits thereof; the main controller controls the plurality of controlled infrared luminous sources to carry out quick switch switchover; and the infrared receiving sensors and signal processing circuits thereof receive the signal of the controlled infrared luminous sources (1), and filter ambient light components in the signal. Compared with the prior art, the infrared touch screen circuit has the advantages of wide applicable range, low implementation cost, simple circuit structure, high performance and the like.

The invention provides a portable line fault monitoring/analyzing recorder. The portable line fault monitoring/analyzing recorder comprises a voltage type signal acquisition device, a paperless recorder, a voltage converter and a current transformer; the voltage type signal acquisition device is connected with the voltage converter, the voltage converter is connected with the paperless recorder by use of a wire, and the paperless recorder is connected with the current transformer; a signal acquired by the voltage type signal acquisition device is sent to the voltage converter and converted into a DC signal by the voltage converter, and the DC signal is sent to the paperless recorder; a current signal is detected by use of the current transformer of a split core type, and the split core type current transformer outputs a DC signal which directly goes into the paperless recorder; the paperless recorder records voltage and current signal curves. The portable line fault monitoring/analyzing recorder has the advantages of easy fault detection point connection, diversified detection ways, long voltage and current curve recording time and short curve sampling period, and further is capable of quickly realizing monitoring on a continuous-production automatic system out of order temporarily and analyzing the part out of order of a detected device by use of the curves recorded by the paperless recorder. The portable line fault monitoring/analyzing recorder is simple to operate and convenient to carry and use.

The invention discloses a method for measuring the calcium contents of inhalable particles in building construction dust.The method includes steps of extracting samples; pre-treating the samples; carrying out evaporation volume setting; preparing standard blank solution and standard working solution; measuring the calcium contents by means of graphite furnace atomic absorption spectrometry.The invention further discloses a method for detecting the accuracy of the method for measuring the calcium contents of the inhalable particles in the building construction dust.The method for detecting the accuracy includes steps of preparing five portions of to-be-tested sample solution with different concentrations from national standard substances with known calcium contents; respectively detecting the calcium contents of the to-be-tested sample solution by the aid of the method for measuring the calcium contents of the inhalable particles in the building construction dust, and verifying the accuracy of the method for measuring the calcium contents of the inhalable particles in the building construction dust.The methods have the advantages of short sampling time, high digestion speed, little measurement disturbance, accurate and reliable results and the like.

The invention provides a driver brake strength identification method based on double fuzzy control. The method comprises the following steps: 1, acquiring a brake pedal pressure signal through a brakepedal pressure sensor, acquiring a wheel angular speed signal through a wheel speed sensor, and acquiring a brake pedal displacement signal through a brake pedal displacement sensor; 2, based on thesignals, obtaining the brake pedal pressure change rate, the wheel linear speed and the wheel deceleration through calculation; 3, preliminarily recognizing the brake intention based on fuzzy controlby taking the brake pedal pressure change rate, the wheel deceleration and the brake pedal displacement as input variables; 4, selecting a sampling period of the brake pedal displacement according tothe recognized driver brake intention; and 5, obtaining the brake strength based on fuzzy control by taking the brake pedal displacement and the brake pedal speed as input variables. According to theinvention, the problems of large pedal speed calculation error and low brake intensity identification precision during emergency brake in the existing research are effectively solved.