10 results about "Critical range" patented technology

The invention discloses a thermal deformation control method for hot gas bulging forming of ultrahigh-strength steel. According to the method, the temperatures of a fillet area and a central area of a mold are controlled to be lower than the temperature of a non-deformation supporting area in the axial material supplementing and radial forming stage; bulging is conducted through a dynamic air pressure curve, the strain rate is inversely calculated in real time based on the wall thickness measured through laser, and the strain rate is stabilized within the critical range through closed-loop feedback; meanwhile, the temperature of the pipe blank is monitored in real time through a thermal infrared imager and compared with a target value, and the deviation is controlled within + / -5 DEG C by adjusting a mold temperature control unit; according to the method, the dynamic air pressure curve is introduced and is cooperatively controlled with the strain rate in real time, so that the deformation rate of the material in the whole bulging process is always stabilized in the optimal critical plasticity interval, the deformation capacity of the ultrahigh-strength steel at the high temperature can be fully exerted, the uniformity of wall thickness distribution of a component can be greatly improved, and the deformation rate of the ultrahigh-strength steel at the high temperature can be improved. And local excessive thinning or fracture caused by out-of-control strain rate is avoided.

The invention discloses an unmanned vehicle navigation positioning method and system based on particle swarm optimization, and relates to the technical field of intelligent traffic, and the method comprises the following steps: S001, building an inertia weight regulation table, and recording and recognizing the critical range of inertia weight change through the historical moving trajectory of an unmanned vehicle and environment change to form a basic parameter set; and S002, constructing a speed change buffer chain under the guidance of the inertia weight regulation and control table, performing hierarchical and segmented processing on the particle swarm real-time speed adjustment amount, and constraining the speed change amplitude and rhythm to obtain a limited speed adjustment sequence for suppressing group synchronous oscillation. According to the invention, by introducing an inertia weight regulation table, a speed change buffer chain, a time sequence regulation cable and a position balance belt, dynamic balance regulation and closed-loop control of particle swarm navigation positioning are realized. According to the method, speed synchronous oscillation is effectively inhibited, the pose output is smoothed, and continuous connection of steering and power control is kept, so that the navigation and positioning stability and control precision of the unmanned vehicle are improved.

This invention relates to the field of power electronic converter control technology and discloses a method and apparatus for judging the transient stability of a hybrid system with a grid-connected converter. The method includes constructing an equivalent model of the hybrid system comprising a grid-connected converter and a network-connected converter, wherein a virtual impedance is connected in series in the branch of the network-connected converter; constructing a Lyapunov energy function based on the equivalent model, wherein the independent variables include the power angle and phase-locked loop frequency of the grid-connected converter, and the power angle, frequency, and voltage amplitude of the network-connected converter; determining the stability domain boundary of the hybrid system using the Lassel invariant set principle when the derivative of the energy function with respect to time is less than or equal to 0; calculating the critical range of the virtual impedance based on the changing trend of the stability domain boundary, and determining the target value of the virtual impedance to maintain the transient stability of the hybrid system. The above method achieves quantitative judgment and parameter tuning of the transient stability of the hybrid system.

1. The name of the design product: range hood control graphical user interface for electronic device. 2. The use of the design product: an electronic device. 3. The design points of the design product: the graphical user interface content displayed on the screen. 4. The picture or photo that best indicates the design points: design 1 front view. 5. Design 1 is designated as the basic design. 6. The use of the graphical user interface: to reflect the ambient air quality, and the user can realize the function of range hood air purification by clicking, touching icons (keys), etc. 7. The change state of the graphical user interface: design 1 front view is the main interface; click weak gear to enter design 1 interface change state diagram weak gear working interface; design 2 front view is the main interface; click the explosive stir-fry gear icon to enter design 2 interface change state diagram explosive stir-fry gear working interface; design 3 front view is the main interface; click the power icon to enter design 3 interface change state diagram 1 strong gear working interface; the interface displays the environmental PM2.5 content, and after a preset time, enter design 3 interface change state diagram 2 detection result (qualified range) display interface; design 4 front view is the main interface; click the power icon to enter design 4 interface change state diagram 1 strong gear working interface; the interface displays the environmental PM2.5 content, and after a preset time, enter design 4 interface change state diagram 2 detection result (exceeding the standard) display interface; design 5 front view is the main interface; click the power icon to enter design 5 interface change state diagram 1 strong gear working interface; the interface displays the environmental PM2.5 content, and after a preset time, enter design 5 interface change state diagram 2 detection result (critical range) display interface; design 6 front view is the main interface; if the shutdown time exceeds the preset time, click the power icon to enter design 6 interface change state diagram intelligent ventilation working interface.

Systems and methods are provided for identification and discrimination of subpopulations within a mixture of particles. The systems and methods implement continuous calibration of the classification of particles within the mixture to provide consistency in operation and to reduce inter- and intra-batch processing variation. The systems and methods produce advantageously sorted particle products.

The invention relates to the technical field of water electrolysis hydrogen production, in particular to water electrolysis hydrogen production equipment and method using ultrapure water. The equipment is provided with a detection element for collecting cathode pressure, anode pressure and gas production parameters; the configuration controller controls output of the direct-current power supply and action of the release valve according to acquired data; the controller judges the hydrogen and oxygen interchanneling risk based on the collected data, and determines that the hydrogen and oxygen interchanneling risk possibly exists when the cathode and anode pressure difference is within a preset critical range; and executing an opening pulse action under the condition, acquiring and contrasting transient responses of the cathode pressure and the anode pressure in the opening pulse action process so as to obtain a detection result about whether hydrogen and oxygen interplay occurs or not, and updating a judgment result about the hydrogen and oxygen interplay risk. The stability of the quality of produced gas can be kept in the electrolysis process, and the safety of hydrogen and oxygen separation is ensured.

Systems and methods are provided for identification and discrimination of subpopulations within a mixture of particles. The systems and methods implement continuous calibration of the classification of particles within the mixture to provide consistency in operation and to reduce inter- and intra-batch processing variation. The systems and methods produce advantageously sorted particle products.

The invention discloses a method for evaluating ecological environment evolution situation and value along an extra-high voltage line, and the method comprises the steps: collecting calibration parameters related to vegetation coverage, soil physicochemical, hydrological dynamic, geologic structure and biological diversity through an extra-high voltage ecological evolution monitoring and analysis platform; a disturbance critical interval of each parameter is determined through an extra-high voltage ecological disturbance threshold model, a coupling response relationship between geology and other ecological parameters is analyzed through a geologic ecological response model along a line, and evolution trends under different time dimensions are quantified by using an ecological evolution trend weighted analysis algorithm. The method solves the problems that an existing method is single in evaluation dimension and insufficient in systematicness, and the method has the advantages that the evaluation index system including spatial differentiation and time evolution characteristics is constructed, and finally, multi-model output results are integrated, so that the comprehensive evaluation of the ecological, economic and social values of the ecological environment along the extra-high voltage line is realized. And the comprehensiveness and the accuracy of the evaluation result are improved.

The invention relates to the technical field of optical lens design, and discloses a Fermat spiral golden angle offset lens arrangement method and system.The method comprises the steps that lens parameters are obtained, a curved surface polar coordinate system is established, a Fermat spiral model is adopted to generate an initial dot matrix, uniformity is evaluated through Voronoi space subdivision, and a final lens array is obtained. Self-adaptive offset optimization is carried out in a golden angle critical range, a central vision protection area is applied to constrain and restore the uniformity of an inner ring, a pre-distortion compensation mechanism is adopted when curved surface projection mapping is executed, optical parameters of the microstructure are configured according to the radial position, and finally a digital processing file is generated. According to the invention, high-uniformity isotropic arrangement of the microstructures can be realized on the curved surface of the lens, and the technical problems that the existing periodic arrangement generates structured artifacts and the existing non-periodic arrangement lacks adaptive optimization capability are solved.

The invention relates to the technical field of geomagnetic detection, in particular to a magnetic field detection device used in a polar region environment, which comprises a first probe, a second probe and a data processing circuit board, a plurality of first magnetic field sensors which are orthogonally arranged are arranged in the first probe; a plurality of orthogonally arranged second magnetic field sensors are arranged in the second probe; according to the device, probe measurement values and environment temperature are monitored in real time through the data processing circuit board, when the first probe measurement value is in a measuring range critical interval and temperature change indicates that a temperature drift error exceeds a limit, second probe data are preferentially adopted for output and calibration, and a setting / resetting circuit is dynamically triggered to eliminate sensor magnetic history; measurement temperature excursion in a polar region ultra-low temperature environment is effectively inhibited, full-scale high-precision magnetic field detection is also realized, and the reliable requirement of unattended long-term stable monitoring in a polar region severe environment is met.