197results about How to "Eliminate disturbance" patented technology

The invention discloses a variable air volume room temperature control method based on fuzzy PID and a prediction control algorithm. The method comprises the steps that the temperature deviation between an expected room temperature and an actual room temperature is input to a fuzzy adaptive PID controller, PID parameter incremental quantity of the opening degree of a tail end air valve is obtained through calculation, and calibrated opening degree of the tail end air valve is output; the opening degree of the tail end air valve of the fuzzy adaptive PID controller is subtracted from the opening degree of the tail end air valve of a previous moment by utilizing a time delay link to obtain the variable quantity of the opening degree of the tail end air valve; the prediction control algorithm is adopted to obtain the actual opening degree of the tail end air valve through the variable quantity of the opening degree of the tail end air valve, and the room temperature is maintained at a set value and is kept unchanged. The control method combining the fuzzy PID with the prediction control algorithm is adopted to solve the technical problems that parameter setting difficulty is large, working condition adaptive capacity is poor, and adaptive ability is weak in an air conditioning system in the prior art.

The measuring system is placed in the course of a process line and is used to detect at least one measurement variable of a medium flowing in the process line. The system comprises a measuring sensor for this purpose with a measuring tube that conducts the medium to be measured and a sensor assembly which has at least one sensor element that reacts primarily to the measurement variable to be detected and which supplies at least one measurement signal that is influenced by the measurement variable by means of the sensor element or elements. In addition, the measuring system comprises measuringelectronics that communicate with the measuring sensor and that use the measurement signal(s) to generate, at least intermittently, at least one measured value that represents the current measurementvariable. The measuring tube of said measuring system has a smaller flow cross-section than a supply segment of the process line that is connected to the inlet side of the measuring system. The measuring system therefore also has a flow conditioner that is situated on the inlet side of the measuring tube, extends between said tube and the supply segment of the process line and has a lumen which tapers towards the measuring tube and through which the medium flows during operation. The flow conditioner has at least one baffle which is situated upstream of the outlet end of said conditioner, projects into the lumen of the latter and against which the medium in the conditioner flows.

The invention discloses a method for conducting rapid initial alignment on vehicle load inertial navigation motion based on auto-disturbance-rejection control.The method is characterized by comprising the following steps that 1, before a vehicle is started, inertial navigation is initialized, and coarse alignment under the condition of an inertial navigation static base is completed; 2, after the vehicle is started, the observation quantity is constructed through inertial navigation and velocity information output by a mileometer; 3, a motion fine alignment loop is designed through the observation quantity, an inertial navigation error equation and an auto-disturbance-rejection control method; 4, parameters of an auto-disturbance-rejection controller are adjusted and finalized; 5, a feedback matrix is constructed through the misalignment angle output by an observer, so that initial alignment of vehicle load inertial navigation motion is achieved.By means of the steps, the coarse alignment method, observation quantity construction, the design method of the auto-disturbance-rejection control loop and the like adopted before the loaded vehicle is started are described in details; by means of the method, statistics characteristics of noise do not need to be known in advance, a quite precise model is not needed either, and the rapid inertial navigation alignment problem under the vehicle load environment and the problem of compensation under the external disturbance in the vehicle load process of inertial navigation can be solved.

The present invention relates to automatic control and regulation in the industrial combustion reaction process between solid fuel and air. The automatic regulation process for comprehensive combustion in circular fluidized bed reactor features fast load regulation with blowing rate, load stabilization and bed temperature regulation with coal feeding amount, fast air/coal ratio regulation, oxygen regulation to ensure the economical efficiency and negative regulation with induced draft. The regulation mode includes single loop for regulating negative pressure in hearth, composite cascade loop for regulating boiler load and bed temperature, and cascade loop for regulating oxygen content in fume. Compared with traditional techonlogy, the present invention has greatly improved stability, fast disturbance elimination and high economical utility.

This invention discloses an identifying device for pulse signals including a base line calculation module, a subtracter and a peak value identifying module, in which, said base line calculation module receives data of pulses during a discontinuous period to form a data array and compute base line value according to the data array, said subtracter receives pulse data and the base line value and detracts the base line value with the pulse data to get related pulse data to be output to the identifying module, which can identify data directly not necessary to store data based on the parallel process to digital logic circuit and carries out identification to input pulse signals according to the identifying rule and output peak values meeting the rule in all the pulses in a stipulated time period and gives the corresponding writing enable signals of the peak value data used in storing operation.

The invention discloses a nitration denitrificatoin and filter method and a nitration denitrification and filter device for a double-sludge series-connection aeration biofilter. The nitration denitrification and filter device is mainly composed of a water inlet system, a first section aeration biofilter, a second section aeration biofilter and a clean water tank, wherein the first section aeration biofilter is divided into a denitrification zone and a decarburization zone, suspended biological carriers serving as fillers are arranged in the denitrification zone, the second section aeration biofilter is connected with the decarburization zone of the first section aeration biofilter through a gas-water separator arranged in a middle water layer, and the second section aeration biofilter is divided into a nitration zone and a nitration deoxidization filter zone. The nitration denitrification and filter method comprises that denitrification and aerobic decarburization of waste water are respectively achieved through the denitrification zone and the decarburization zone of the first section aeration biofilter, ammonia nitrogen is converted into nitrate nitrogen through the second section aeration biofilter, electron acceptors are provided for the denitrification zone of the first section aeration biofilter, and chemical oxygen demand (COD), nitrogen (N) and suspended solid (SS) areremoved. The system nitration denitrificatoin and filter method and the nitration denitrification and filter device for the double-sludge series-connection aeration biofilter can achieve function separation of denitrification, decarburization and nitration and have the advantages of saving energy, being stable and denitrifying efficiently.

The invention discloses a dual-sludge denitrification dephosphorizing and denitrifying A/A-O device which mainly comprises a primary precipitation pool, an anaerobic-anoxic device, a secondary precipitation pool, a middle pool, a biological aerated filter and a clear water pool, wherein the primary precipitation pool is connected with an anaerobic zone of the anaerobic-anoxic device, a degassing zone of the anaerobic-anoxic device is connected with the secondary precipitation pool, and the secondary precipitation pool is connected with the anaerobic zone of the anaerobic-anoxic device througha sludge pump; the outflow water of the secondary precipitation pool is connected to the middle pool, the middle pool is connected with the biological aerated filter, and the biological aerated filter is connected with the clear water pool; and the clear water pool is connected with the anaerobic-anoxic device. By the process adjustment, denitrifying phosphorus accumulating bacteria becomes dominant bacteria of an AAO unit. The dual-sludge denitrification dephosphorizing and denitrifying A/A-O device realizes the separation of phosphorus accumulating bacteria and nitrobacteria, the separationof the precipitation function and the sludge storage function of the secondary precipitation pool, and the separation of the nitrification function and the filtering function of the biological aerated filter, thereby realizing energy conservation of a combined system, stability and efficiency in denitrification and dephosphorization, and sludge reduction.

A synchronous powder spreading type metal laser 3D printing powder feeding device comprises a powder storage bin (1), a powder feeding bin (2), a powder feeding belt (3), a powder spreading head (4), a driving transmission gear (5), a driven transmission gear (6), a driving motor (7), a cross beam (18), a cladding head (19) and a shell (11). The powder feeding bin is fixed to the cladding head through a rolling bearing and rotates freely. A transmission gear is installed on the upper portion of the powder feeding bin and meshes with the other transmission gear to form a transmission gear pair, and preset movement is achieved under driving of the motor. The powder storage bin stays still but keeps sliding relative to the powder feeding bin. Powder enters the powder feeding belt from a bottom outlet of the powder feeding bin, is fed to the powder spreading head under driving of a driving wheel and is evenly spread on a base plate under the action of gravity to form a powder layer. The powder spreading head and the shell are together fixed to the cladding head. The powder feeding bin and the cladding head move coordinately through procedure setting, the effect that the powder layer is always directly in front of a laser spot is ensured, and circulating water is adopted for cooling in the powder spreading head.

The invention discloses a model prediction current control method of a permanent magnet synchronous motor. The method comprises the following steps: obtaining a d-axis current disturbance item and a q-axis current disturbance item; obtaining three-phase current, three-phase line voltage and rotating speed signals of a permanent magnet synchronous motor, and obtaining a d-axis current observation value, a q-axis current observation value, a d-axis current disturbance item observation value and a q-axis current disturbance item observation value by utilizing a linear expansion state observer; obtaining a d-axis output value and a q-axis output value of a disturbance controller, obtaining an inductance prediction value by using an inductance extraction algorithm, and obtaining a d-axis current prediction value and a q-axis prediction current value in combination with an incremental prediction model; and adjusting the switching signal of the permanent magnet synchronous motor by using theinductance prediction value, the d-axis current prediction value and the q-axis prediction current value so as to realize the closed-loop control of the permanent magnet synchronous motor, so that therobustness of a permanent magnet synchronous motor model prediction current control algorithm is improved.

The invention discloses a device and method for improving casting blank quality of continuous casting production. The device comprises a plurality of casting-rolling mill racks arranged in the casting strand direction, an electromagnetic linear period symmetric stirring unit and a drive adjustment type secondary cooling water control unit. The casting-rolling mill racks are used for artificially and forcibly forming solidification tail ends and arranged on a casting strand horizontal area. The electromagnetic linear period symmetric stirring unit is arranged on a casting strand arc area. The drive adjustment type secondary cooling water control unit is used for conducting stepless water spraying cooling on the surfaces of casting blanks based on real-time measuring. The liquid core large-rolling-reduction casting-rolling device and technology used for artificially and forcibly forming the solidification tail ends form the large rolling reduction in the thickness direction of the casting blanks, so that the solidification tail ends are artificially and forcibly formed inside the casting blanks, conditions for forming defects in the natural solidification process of the casting blanks are terminated, flowing of solute element molten steel enriched in the casting blanks is prevented, and the effects of homogenizing and density inside the casting blanks are improved.

The invention discloses a remote LIBS (Laser-induced Breakdown Spectroscopy) element quantitative analysis method based on weighted multispectral calibration. The method comprises the following steps: firstly, achieving remote target LIBS spectral acquisition of a test site, and in the process, qualitatively obtaining major element compositions of the remote target to be tested, as well as the line strengths of multiple spectral lines of elements to be tested; then, finishing laboratory sample calibration and obtaining the relation fitted equation between the strengths and the percentage contents of the multiple lines of the elements to be tested; finally, quantitatively calculating the percentage contents of the elements to the tested according to the multispectral weighting method. The method can solve the remote LIBS element quantitative analysis problems better.

The invention relates to a method for inhibiting moving-gimbal effects of a single gimbal magnetically suspended control moment gyroscope. In the method, a state equation of the single gimbal magnetically suspended control moment gyroscope is set up according to newton second law and a gyro technique equation; an inversion analysis of a system is calculated by utilizing an inverse system method; in a rotor system, moving-gimbal displacement of a magnetically suspended rotor is eliminated through state feedback of rotor displacement, an rotor reflection angular speed and a gimbal angular speed, and in a gimbal system, reactionary torque interference of the rotor to the gimbal system is eliminated through state feedback of the gimbal angular speed and the rotor reflection angular speed; and a robust servocontrol strategy is adopted to improve the robustness of the whole system. In the method, the moving-gimbal displacement of the magnetically suspended rotor is eliminated, the reactionary torque interference of the rotor system to the gimbal system is also eliminated in the gimbal moving process, and the stability and precision of the whole single gimbal magnetically suspended control moment gyroscope are improved. The method belongs to the technical field of aerospace control, and can be applied to high-precision control of magnetically suspended control moment gyroscopes.

A well drilling orientating sensor can achieve the high anti-interference capacity, the high precision and high guiding operation efficiency and is installed in a measurement and control system connected with a drilling-following measurement tool through an inserted shaft. The well drilling orientating sensor comprises an orientating sensor body, a magnetic orientation angular compensator and an inductive coil.

The invention belongs to the technical field of micro-spectral imaging detection and relates to a method and device for testing a spectral pupil laser differential confocal CARS micro-spectrum. The core thought is as follows: Rayleigh light and CARS light loaded with tested sample spectral characteristics are excited by double lasers as a light source; and nondestructive separation is carried out on the Rayleigh light and the CARS light by using a dichroic optical system, wherein the Rayleigh light is subjected to geometrical detection and positioning, and the CARS light is subjected to spectrum detection. By using the characteristic that a zero crossing point of the spectral pupil laser differential confocal curve accurately corresponds to a focus position, the focus position of an excitation beam is accurately captured and positioned, and high-precision geometrical detection and high-spatial-resolution spectrum detection are achieved to form the method and device capable of achieving high-spatial-resolution spectrum detection of a sample micro-region. Through combining a CARS microscopical technique, the excited Raman scattering light loaded with sample information is shorter than a traditional spontaneous Raman effect in time, and the sample can be quickly subjected to nondestructive detection. The method and the device have the advantages of accurate positioning, high spatial resolution, nondestructive detection and high spectrum detection sensitivity, and a new way is provided for micro-region spectrum detection and geometrical measurement.

The invention relates to a method for controlling the outlet temperature of an electric heater in a supercritical water treatment system. The method is characterized by comprising the following steps: introducing a furnace temperature controller as an auxiliary controller in a cascade control mode to control the power output of the electric heater; forming a negative feedback loop by utilizing a control variable introduced to an inner ring; and introducing fluid flow as feedforward into the control so as to directly act on the power output of the electric heater; performing difference value comparison on the inlet temperature and outlet temperature of the heater, and limiting the amplitude of the whole control output according to the required power fitting calculation formula. The method can be used for effectively overcoming the disturbance of self thermal inertia, inlet temperature changes and fluid flow changes of the electric heater on the outlet temperature control of the electric heater, and realizing quick and accurate control on the outlet temperature of the electric heater.

The present invention belongs to a device for simulating the three-axis gesture movement, and relates to a method for controlling the three-axis accurate angular movement. The device timely generates an orthogonal harmonic compensation control signal related to the variation of rotation angle with a control calculating device according to the harmonic characteristic of the disturbance of in-axis coupling torque and real-time calculates and regulates the amplitude of each stage of subharmonic signal according to the servo error of system, and applies the compensation control signal to the independent basic closed-loop servo-controlled loop of the corresponding axis. The invention adopts a strategy and a system structure which execute harmonic self-adapting feedback control to the in-axis movement coupling torque disturbance caused by the structural mass arrangement. The tracking error of position servo between each axis in the linkage angular rate state is evidently reduced, and the linkage capability is greatly improved.

The invention relates to a method for eliminating a background light disturbance in a camera-equipped indoor visible light positioning system, wherein the method belongs to the technical field of visible light communication. According to the method, LEDs asynchronously transmit signals. A plurality of times of iteration averaging are adopted for eliminating the background light disturbance in the signals which are detected by the camera, thereby realizing more stable indoor visible light positioning. The method is characterized in that different-frequency signals are exerted on different LEDs; the signals which are transmitted by the LEDs are received by the camera, an image is formed through the signals and is converted to a gray scale image; iteration averaging is performed on continuous N gray scales in the gray scale image; the gray scale which is obtained through interaction average of the N gray scales is subtracted from the gray scale of the gray scale image, namely elimination of background light disturbance is realized; then fast Fourier transformation (FFT) is performed on the signal after background light disturbance elimination; a frequency which corresponds with an amplitude spectrum peak value is acquired; the above processes are repeated for M times; a largest frequency in the results of M times of processes is compared with a built-in LED frequency-coordinate database in an intelligent terminal; and the coordinate of the LED lamp is obtained, namely positioning is realized.

The invention provides a quick initial coarse alignment method of an inertial navigation system suitable for shipborne communications on the move. The method includes the following steps that firstly, satellite position information is read, and a projectional component of a satellite under the geographic coordinate system of the inertial navigation system is computed; secondly, the angle of pitch and the angle of roll of the inertial navigation system is worked out through the accelerometer information in short time; finally, the azimuth angle and the angle of pitch of an antenna are read at this moment, and the projectional component of the satellite under the carrier coordinate system of the inertial navigation system is computed; the course angle of the inertial navigation system is worked out through the projectional component and the angle of pitch and the angle of roll of the inertial navigation system, and quick initial coarse alignment of the inertial navigation system is completed. The method is suitable for initial coarse alignment of the inertial navigation system of the shipborne communications on the move under the mooring state.

Research on resistance machine learning shows that a deep learning architecture is easily attacked by an adversarial sample. The carefully designed small disturbance can cause wrong classification ofnormal images by the neural network, but cannot cause recognition errors to a human vision system. The invention provides a digital image adversarial sample defense method based on truncated singularvalues and pixel interpolation, and the method is based on pixel matrix analysis and image pixel interpolation processing, so as to achieve the purpose of restoring the normal recognition of an imagein a deep learning model. Under the condition of ensuring that normal pictures are not mistakenly classified by the deep learning model due to the operation, countermeasure attacks can be effectivelydefended. According to the method, matrix analysis and singular value decomposition are effectively utilized, an optimal approximation image highly similar to an adversarial sample is reconstructed byreserving a large singular value, and the reconstructed image can be correctly recognized by a deep learning model after pixel interpolation processing. In addition, the unpredictability of the defense model can be improved through pixel interpolation, and therefore the purpose of defending against black box attacks is achieved.

The invention discloses a wireless network transmission method which is based on transmission data packet length on line optimization. The data transmission method comprises calculating the length of an optimum transmission data packet which is suitable for current network to transfer according to the relationship among optimum value of the length of a transmission data packet of wireless network, expect value of transmission time of continuous on line of network and network transmission speed, approximately calculating the expect value of transmission time of continuous on line of network through arithmetical average algorithm, and estimating transmission speed through average network transmission speed of forwards continuous on-line transmission time. The transmission method dynamically adjusts the length of a transmission data packet in the wireless network transmission process on line through utilizing the above algorithm, thereby improving data transmission property under wireless network condition. The data transmission method which is provided by the invention can effectively reduces network transmission flow in data transmission process, which improves the efficiency of data transmission under wireless network environment, and lowers data transmission cost of wireless network.

A probe assembly for real-time monitoring of fluid state in a sensor using impedance spectroscopy, the probe assembly has two closely spaced tubular concentric electrodes. When the pitch is in the range of about 0.15 to 0.55 mm, the surface area of ​​the electrodes is about 8.1 to 10.8 cm2. In one embodiment, a concentric tubular outer Faraday shield is used to monitor fluid within a non-metallic container. This probe assembly is especially useful for monitoring hydraulic fluids, including automatic transmission fluids and mineral-based engine oils used in diesel and gasoline engines.