138results about How to "Reduce the impact of disturbance" patented technology

A method and improved apparatus for detecting leaks in pressurized pipeline systems, which compensate for the thermally induced volume changes of the liquid in the line during a test that are produced by both the nonlinear changes in the mean temperature of the liquid and the pressure-induced perturbations of the temperature of the liquid.

The invention discloses a method for classifying electric energy quality mixed disturbances based on multi-feature quantity of time-frequency domain. Voltage dip, voltage swell, short-term voltage interruption, impulsive transient, oscillatory transient, harmonic waves and flickering electric energy quality disturbances and mixed disturbances of a combination thereof are classified. The method for classifying the electric energy quality mixed disturbances concretely comprises the steps of: firstly, processing a disturbance signal by using an EEMD (Ensemble Empirical Mode Decomposition) and MIST (modified incomplete S-transform), and extracting nine time-frequency domain characteristic values; and then, inputting characteristic quantity to a blocked automatic classifying system to recognize the disturbances. By using the method, the mutual interference among single disturbances is fully considered and is effectively inhibited through the complementary time-frequency domain characteristic values. A simulation result shows that, under conditions of certain noises, the method can be used for effectively classifying the voltage dip, the voltage swell, the short-term voltage interruption, the impulsive transient, the oscillatory transient, the harmonic waves and the flickering electric energy quality disturbances and the mixed disturbances of the combination thereof.

The invention relates to a control method, in particular to a control method for an automotive active suspension system. The problem that design models are simple, and single-target control is mainly adopted in the conventional suspension control technologies, so that external uncertain disturbance and unmodeled dynamics cannot be coped with is solved. The control method specifically comprises the following steps of: establishing a nonlinear active suspension model; designing a nonlinear robust controller; and regulating gains k1, k2, epsilon1 and epsilon2 to ensure that all constraints are limited within a permissible range, namely to realize constraint control. The control method is used for the control and the stabilization of the automotive active suspension system.

The invention discloses a touch screen and a driving method thereof. The touch screen is characterized in that touch electrodes are internally embedded in a display panel; the touch electrodes comprise a touch signal input electrode and a touch signal output electrode, which are crossly arranged in an insulating manner; a first common electrode is at least divided into a plurality of regions along the direction of data lines; each region of the first common electrode corresponds to at least one row of pixel units; and all regions of the first common electrode are insulated to each other and serve as the touch signal input electrode. According to the touch screen disclosed by the invention, the common electrode is divided into the plurality of regions along the direction of the data lines, and the regions serve as the touch signal input electrode. According to the invention, the reduction of a pixel voltage is offset by voltage disturbance produced when the common electrode is used as a driving electrode so that the disturbance influence caused by the scanning of the common electrode is reduced and the quality of displayed pictures is increased.

The invention discloses a contour error controller for a multi-axis motion system and a control method thereof. The contour error controller comprises the multi-axis motion system. Each axis of the multi-axis motion system is provided with a sliding mode variable structure controller and an extended state observer. The sliding mode variable structure controller can obtain a control signal based ontracking errors of each axis; and the extended state observer can observe observation variables for producing position signals, velocity signals and disturbance signals of each axis. The invention proposes a contour error control algorithm based on extended state disturbance observation for multi-axis linkage control system formed by three-axis permanent magnet linear synchronous motor servo drives, thereby effectively reducing tracking errors and contour errors. The extended state observer is used to observe the disturbance signal to reduce influence of the disturbance, and a sliding mode variable structure control algorithm is combined to form a uniaxial trajectory tracking controller, thereby ensuring uniaxial tracking accuracy and robustness; and through a cross coupling controller, the problem of multi-axis coordinated movement is solved and multi-axis contour control precision is improved.

The present invention relates to a vehicle trajectory prediction method and device based on the driver's control intention, and a system. The invention comprehensively considers the driving intentionand the real-time motion state of an automobile to make short-term predictions on the trajectory, speed and acceleration parameters of the automobile, and reduces the disturbance influence of driver'scontrol behaviors on the prediction of the automobile motion state. The method is easy to implement, has low algorithm complexity, is widely used in driving simulators, automobile collision hazard early-warning, and automobile safety assisted driving systems, and is used to evaluate and predict trajectory crossing between moving vehicles and the collision risk.

A space stealth flight technical method comprises an infrared stealth technology, an antiradar stealth technology, an anti-visible light stealth technology, and an anti-laser detection technology. The infrared stealth technology adopts a space cold shielding system near triple point refrigeration technology mainly comprising a ground filling up process, a ground pressure filling up process, a starting process and a steady-state flight process, each process is implemented by a layered liquid storage method, a saturated vapor outlet pipe diffusion diversion method, a cold vapor emission control method and a superheated vapor secondary diffusion diversion method. The inventive method integrally utilizes the anti-infrared, anti-radar, anti-visible light, anti-laser detection technologies and other technologies of space aircrafts, and enhances the full-dimensional space stealth flight ability of the aircrafts, so as to meet the space safety flight requirements; and is especially suitable for the safety stealth flight of the space aircrafts.

The invention discloses a detection device and detection method for measuring long-focal-length lens transmission wavefront by a computer-generated holography, and belongs to the technical field of optical measurement. The detection device is mainly characterized in that an interferometer, a measured long-focal-length lens and a Fresnel wave zone plate form a Fizeau interference optical path; when collimated parallel light output by the interferometer passes through a standard plane mirror, one beam is reflected by a reference surface of the standard plane mirror to form a standard reference light beam; the other beam penetrates through the measured long-focal-length lens to be transmitted and is reflected through the wave zone plate to return along the original path for forming a test light beam; the test light beam and the standard reference light beam generate interference; the tested long-focal-length lens is regulated, so that interferometric fringes are minimum; the transmission wavefront of the tested long focal-length lens can be obtained through measurement. The method and the device provided by the invention are applicable to the detection of the long-focal-length lens transmission wavefront.

The invention relates to a forcer/position hybrid control method of a multi-arm teleoperation robot based on a performance function. The situation that the force/position coupling of an operation object and mechanical arms in the operation process in the actual operation process is considered, by correspondingly designing controllers of a master terminal and a slave terminal, in the control process of the slave terminal mechanical arm, by pre-designing the performance function of the mechanical arms, a force position hybrid controller of the slave terminal mechanical arm is designed, so that under the condition that a target is disturbed by certain external factors in the operation process, the influence of disturbance can still be reduced through the control of the mechanical arms, and the position, speed and acting force of the robot can be adjusted adaptively at the same time to ensure the stability of system operation, and thus the cooperative operation of multi-arm teleoperation is realized.

The invention discloses a preparation method of a silicon epitaxial wafer for a high-voltage power device. According to the method, a reaction cavity of the epitaxial equipment is purified and the content of impurities accumulated in the cavity is reduced by long-time purging of large-flow hydrogen before epitaxial growth; the nonlinear gradient heating is adopted, so that the stress accumulated in the heating stage is released in time, and the generation probability of defects is reduced; and the reaction rate is significantly improved by shortening the distance between a quartz bell jar anda base of the reaction cavity of the epitaxial equipment and adopting a large-flow trichlorosilane and hydrogen proportioning mode, and high-speed epitaxial growth is realized under the premise of ensuring good crystallization quality of the silicon epitaxial wafer. The problem of comprehensive control on thickness, resistivity and crystallization quality in the existing preparation process is overcome by adopting the method of sectional growth of the silicon epitaxial wafer layer. the prepared silicon epitaxial wafer has a bright surface, is free from dislocation, staggered layers, slip linesand fog defects, realizes the controllability of material indexes such as thickness, resistivity and defects and meets the use requirements of the high-voltage power device.

The invention discloses a construction method of an open caisson. The construction method comprises the steps of construction preparation work; foundation pit excavation as well as sand cushion layerand plain concrete cushion layer manufacturing; open caisson first-section, open caisson second-section and open caisson third-section manufacturing; open caisson first-time sinking; open caisson fourth-section and open caisson fifth-section manufacturing; open caisson second-time sinking; open caisson underwater plain concrete bottom sealing; open caisson bottom plate manufacturing; and pipelinebuttress, mud discharging well and tail work construction. The open caisson sinks by adopting an undrained process, the soil sampling mode is matched with an air mud suction diver, and the sinking assisting mode is sinking by a pressure sinking method and resistance reduction and sinking assisting by thixotropic mud. According to the method, the sinking method is adopted, the posture of the open caisson is convenient to control, the sinking precision of the open caisson is high, the depth of open caisson blade feet penetrating into a soil layer is larger through a counter-force system, the sufficient sinking coefficient is achieved, the sinking speed of the open caisson can be greatly increased, disturbance to external soil is small, the phenomenon that a structure is prone to differentialsettlement, deformation, cracking and the like are effectively prevented, and a soil bin in a well lattice cannot be raised in the sinking process.

The invention discloses a power quality compound control device based on a nine-switching tube inverter. The main circuit structure of the device based on the nine-switching tube inverter provides twooutput ports, the output port at the upper end is connected to a grid in series through a coupling transformer to achieve the function of a dynamic voltage restorer (DVR), and the output port at thelower end is directly connected to the grid in parallel to achieve the function of an active power filter (APF). The DVR port controls output voltage by means of a load control strategy based on gridvoltage feedforward and load voltage feedback, so that voltage sag and three-phase imbalance are compensated for rapidly and accurately. The ARF port detects a harmonic current by means of an improvedFBD method based on an averaging method and a phase-leading network, and controls an output current by means of multiple quasi-PR control, so that detection and compensation of the harmonic current,an unbalanced current and a reactive current are completed rapidly and accurately. The power quality compound control device based on the nine-switching tube inverter has the advantages that three switching tubes are saved, the production cost is reduced, the installation flexibility of the device is improved and the application field is broadened.

The invention discloses a shield tunnel synchronous grouting similar model testing method. A test box, a data acquisition system connected to the top surface of the test box, a construction simulationsystem penetrating through the test box, a grouting system communicating with the construction simulation system, and a propelling system used for propelling the construction simulation system are included. Gravel soil is placed in the test box; the propelling system comprises a hydraulic jack and a counter-force frame fixedly connected with one end of the hydraulic jack; the counter-force frameis fixed on the bottom face; the construction simulation system comprises a first long pipeline 32 pre-embedded in the test box and a second short pipeline 31 connected with the first long pipeline 32in a sleeving manner; the data acquisition system comprises a static strain gauge, displacement detection sensors and miniature pressure sensors; and the displacement detection sensors and the miniature pressure sensors are connected with the static strain gauge. According to the method, conditions of any soft soil stratum, geometric scale of a tunnel, construction excavation process and synchronous grouting parameters are effectively simulated, and the flow and permeation of slurry are effectively observed.

The invention discloses a traffic state prediction method and device, and relates to the technical field of intelligent traffic. A specific embodiment of the method comprises the steps of determiningtraining sample data according to historical traffic data and first time period traffic data of a training road section and first time period traffic data of a road section adjacent to the training road section; wherein the historical traffic data is used as a first data source, the first time period traffic data of the training road section is used as a second data source, and the first time period traffic data of the road section adjacent to the training road section is used as a third data source; respectively determining the weight of each data source and the weight of each training sampleaccording to the training sample data; based on the training sample data, the weight of each data source, the weight of each training sample and a preset loss function, training to obtain a traffic model; and determining the traffic state of the to-be-predicted road section based on the traffic model. According to the embodiment, the influence of data disturbance can be effectively reduced, and the accuracy of traffic prediction is improved.

The present invention provides a method for synergistically suppressing combustion pressure pulsation by using a high-frequency excitation discharge center plasma and a side plasma, and relates to a method for suppressing pressure pulsation in a thermoacoustic oscillation phenomenon. In the present invention, synergy of a center plasma and a side plasma is taken as a dynamic and active way to regulate the pressure pulsation state of the combustion chamber during combustion. The method provided by the present invention is characterized in that plasmas are generated at the root and side of the flame in the combustion chamber, and the root plasma dynamically affects the frequency and the phase law of the flame heat release, so that the response degree of the pulsating flame to the airflow disturbance changes; the plasma applied on the side of the flame is input to the main body for absorbing the flame through certain energy to change the distance between the main flame heat release zone and the outlet of the combustion chamber, that is, the length of the return path reflected by the pressure pulsation in the combustion chamber from the outlet of the combustion chamber is changed, andthe phase difference between the pressure pulsation and the flame heat release rate changes; and at the same time, the synergy and adjustment of the plasmas at the two positions can achieve the slowing or suppression of the combustion pressure pulsation.

The invention discloses a probe for testing a lateral load of deep soil, which comprises a flat shovel probe. A micro rigid load bearing plate is arranged in the flat shovel probe; limitation of the micro rigid load bearing plate in the flat shovel probe is implemented by a steel ring; the micro rigid load bearing plate is connected with one end of a spring and the other end of the spring is connected with the flat shovel probe; a micro displacement sensor is fixedly arranged in the flat shovel probe; and the micro displacement sensor is used for continuously measuring the displacement of the micro rigid load bearing plate. The probe for testing the lateral load of the deep soil carries out field lateral load testing on the geotechnical engineering testing deep soil, can replace a conventional flat shovel lateral expansion test and is used for measuring a horizontal bearing force, a modulus of deformation, a static lateral pressure coefficient, a horizontal bedding coefficient and the like of the deep soil.

The invention provides a waste liquid pool aeration tube for sewage treatment, and a sewage treatment water purifying agent. The waste liquid pool aeration tube comprises an air inlet tube, a connecting cavity, aeration tubes and a tank body. A partial area in every aeration tube is designed to achieve synchronous rotation pushing, and the rotation direction is adjustable, so the aeration dispersity is greatly improved, and the stirring aeration effect on a waste liquid pool is improved by two times or above; and the structure of every aeration tube has a good promoting effect when used for releasing the water purifying agent, so the utilization rate of the water purifying agent is increased by 30%, and the comprehensive water treatment effect is remarkably improved.

The invention discloses an underground mould bag pile supporting method. The method includes the following steps that (1), pore-forming is conducted by using a drilling machine to form a mold bag hole, an injection pipe is arranged in the mold bag hole, a grouting outlet hole is formed in the injection pipe, the injection pipe is internally provided with a separator, a mold bag is arranged in themiddle rear section of the injection pipe, at least one grouting outlet hole formed in the injection pipe communicates with the mold bag, a draining pipe is arranged between the rear section of the mold bag and the outer wall of the injection pipe, and the front section of the injection pipe includes a segmented mold bag; (2), first grouting equipment is firstly used for injecting first grout intothe injection pipe to make the mold bag be saturated, then second grouting equipment is used for injecting second grout into the injection pipe, and the second grout flows out of the injection pipe from a front grouting outlet hole; and (3), grouting is conducted on the mold bag hole alternately, and grouting is conducted on a mold bag pile I firstly, and then grouting is conducted on a mold bagpile II after a mold bag I expands fully and achieves certain strength until a mold bag pile supporting wall structure is formed. The underground mould bag pile supporting method has the advantages ofbeing good in stress condition, capable of stopping water, capable of effectively controlling excavation subsidence and the like.