11results about How to "Large room for optimization" patented technology

The invention provides a passenger roller fire personnel evacuation simulation method and system, and the method comprises the steps: building a passenger cabin scene model, carrying out the numerical simulation of a passenger cabin fire, and obtaining the data of a fire product; analyzing a change rule of the fire product, and calculating a fire evacuation speed influence coefficient; improving a particle swarm algorithm, and fusing the fire product data into the improved particle swarm algorithm to obtain a personnel evacuation path optimization model under the fire condition; and simulating a personnel evacuation process in the passenger cabin scene model based on the personnel evacuation path optimization model to obtain an optimal personnel evacuation path under the fire condition. According to the method, the optimization space can be effectively expanded, the capacity of the algorithm for obtaining the globally optimal solution is improved, the optimization capacity of the algorithm in the initial stage is enhanced, and the high-level development capacity is kept in the final stage of search, so that the convergence speed and effect of the algorithm are remarkably improved, and the path optimization result is improved; and the optimal path is ensured to be the shortest path.

The present invention discloses a real-time hybrid test control compensation method, comprising: obtaining the displacement response of the actuator through white noise excitation; fitting the white noise with the displacement response to obtain a transfer model; designing a compensation filter based on the transfer model, and optimizing the parameters of the compensation filter, and completing the hybrid test control compensation based on the optimized compensation filter model. The purpose of the present invention is to reduce the loading error in the hybrid test and increase the test accuracy. At the same time, the stability and reliability of the hybrid test are also guaranteed.

The invention belongs to the field of aviation dynamics design, and particularly relates to a coupling type critical rotation speed optimization method based on an adjustable rigidity interstage supporting structure. The method comprises the following steps: step 1, carrying out rotor dynamics analysis on a double-rotor system, judging whether a coupling type criticality exists in a working rotating speed range of the double-rotor system, and if so, entering step 2; 2, the installation position and the initial rigidity parameter of the interstage supporting structure are determined; step 3, adjusting a stiffness parameter of an interstage support structure by taking reduction of the strain energy ratio of the excitation rotor and the interstage bearing as a target, and performing rotor dynamics analysis on the adjusted dual-rotor system; and 4, according to the rotor dynamics analysis result of the adjusted double-rotor system, judging whether the strain energy ratio of the excitation rotor and the interstage bearing meets the harmless critical standard, if not, returning to the step 3, and if yes, obtaining the interstage support structure meeting the harmless critical standard. The optimization space is large, and the workload is remarkably reduced.

The invention provides a database operation statement processing method and a related product. The method comprises the following steps: acquiring a database operation statement; judging whether an OR logic keyword exists in a conditional statement of the database operation statement or not; if yes, judging whether related sub-connections corresponding to the judgment keywords are recorded in the two conditional clauses connected with the logic keywords or not; and under the condition that the relevant sub-connection corresponding to the judgment keyword exists in the record, converting the database operation statement according to the judgment keyword existing in the record. Through the method, useless sub-connections in conditional or logic keywords can be eliminated, so that an execution plan is simplified, the optimization space of database operation statements is expanded, the execution efficiency of a database is improved, the database operation statements after elimination can execute optimization operations such as semi-connection conversion, reverse semi-connection conversion and the like, and the execution efficiency of the database is improved. And the processing speed of the database operation statement is further improved.

The invention discloses a method for solvent-free in-situ coating of a positive electrode material, which comprises the following steps: 1) respectively mixing two monomer polyhydric alcohols or polyamines and polyisocyanates for preparing polyurethane with positive electrode particles, so that the two monomers are distributed on the positive electrode material particles; and 2) transferring the positive electrode active material particles dispersed with the two monomers into the same mortar, so that the two monomers on the positive electrode material react with each other while being attached to the surfaces of the particles, thereby preparing the positive electrode material with the polyurethane coating. The method has the advantages of being environmentally friendly, low in cost, wide in raw material source, easy to operate, suitable for large-scale industrial production and the like, and commercialization is easy to achieve.

This invention relates to the field of cellular-connected drone video transmission technology, specifically disclosing a method for maximizing user experience quality in multi-drone aerial video transmission. This method is used in aerial video streaming systems that utilize multiple cellular-connected drones to capture video from different points of interest (PoI) regions and transmit the video to ground base stations (BS) and users, allowing ground users to share the drones' field of view. Based on this aerial video streaming system, this invention constructs an optimization problem. By jointly optimizing transmission scheduling, video playback rate, and drone trajectory design, it maximizes the minimum quality of experience (QoE) for all users, considering uplink interference and the trade-off between video quality and smoothness. Simulation results show that, compared to benchmark solutions, the proposed solution achieves a significant performance improvement and achieves a trade-off between video quality and smoothness.

This invention relates to the field of robot motion control technology and discloses a multi-station dynamic scheduling method for the safety zone of an unmanned coffee machine robotic arm. The method first calculates a dedicated dynamic safety radius for each movement based on the motion sector of the scheduling task and the state of the arm's interaction devices. Next, it establishes a geometric envelope model for different load states of the robotic arm and corrects the boundary points of the path based on this model and the dynamic safety radius to ensure that the load entity remains within the safety zone during movement. Finally, by calculating the effective rotation angle between the corrected boundary points and judging based on angle thresholds, it decides to generate a three-segment or a four-segment scheduling path that introduces intermediate transition points. This invention solves the technical problems of path planning redundancy caused by static safety zones and interference caused by neglecting load volume. While ensuring safety, it improves the operating efficiency, reliability, and adaptability to complex paths of the robotic arm.

The invention discloses a hybrid control direct current conversion circuit which comprises a main power topology circuit, a switch control time sequence, voltage feed-forward hybrid control and a starting pre-bias strategy. The main power topology circuit comprises an input voltage source, an input capacitor, a switch tube, a flying capacitor, an inductor, an output capacitor, an output load and the like; the voltage feed-forward hybrid control circuit is a hybrid control circuit with an input voltage adaptive capability and a peak current limiting capability; the starting pre-bias strategy mainly comprises the steps that input voltage is connected in series with a voltage-dividing sampling resistor network, and the resistance values should be the same to ensure that the voltage-dividing proportion is in a linear relation; a current source with enabling control, a hysteresis comparator, an AND gate device and the like. The voltage reduction capacity of the hybrid converter is improved, the inherent starting surge problem is solved, and the hybrid converter has high application value in low-voltage large-current occasions with extremely high voltage reduction ratio.

The invention provides a multi-octave phased array plane design method based on heterogeneous antenna combination. The multi-octave phased array plane design method comprises the following steps: step 1, constructing a high-frequency-band array plane; step 2, constructing a medium-frequency band array surface; 3, constructing a low-frequency-band array surface; 4, constructing a multi-stage subarray synthesis switch network, or configuring an AD / DA module behind each array element channel according to a full-channel digital array mode, and carrying out digital beam synthesis on discretized sampling data as required according to an equivalent array element relationship without constructing a network switch; and step 5, configuring a corresponding working frequency band assembly according to the type of the antenna, and configuring an AD / DA module according to the sub-array output of each frequency band. According to the method, the gain utilization rate of the whole system on the multi-octave working frequency band is improved, the number of hardware channels is reduced on the premise that the effective radiation power and sensitivity are not reduced, the equipment cost is reduced, the balance of the system between the array plane gain and the number of channels is met, and the system performance is improved. The characteristic that the efficiency of a single antenna at low frequency is always lower than that at high frequency is changed.

The invention discloses aluminum-free high-grade non-oriented silicon steel based on rolled hard board normalization and a production method of the aluminum-free high-grade non-oriented silicon steel. The production method comprises the following steps; the continuous casting billet comprises the following chemical components in percentage by weight: less than or equal to 0.005% of C, 1.5-4.5% of Si, 0.2-1.5% of Mn, less than or equal to 0.0030% of Al and the balance of Fe. (2) carrying out hot rolling on the continuous casting billet to obtain a hot-rolled plate with the thickness of 1.8-3.5 mm; (3) the hot-rolled plate is subjected to acid continuous rolling, and a rolled hard plate with the thickness being 0.2-1.2 mm is obtained; (4) the rolled hard board is subjected to normalizing treatment, the normalizing temperature is (850-1000) + / -10 DEG C, and the normalizing time is 60-100 s; (5) a single-rack cold-rolling mill is adopted for conducting 2-4 passes of finish cold rolling on the normalized rolled hard board, the total reduction rate is 40-80%, and a finish-rolled board is obtained; and (6) the finish rolling plate is annealed, and a non-oriented silicon steel finished product with the thickness being (0.05-0.50) + / -0.003 mm is obtained.

The present application relates to the technical field of filter, especially to a kind of adjustable moving blade assembly and tuning filter, including at least two groups of mutually spaced adjustable moving blades, each group of adjustable moving blade has at least two radius different sector metal sheets, each sector metal sheet has discrete distribution metal sheet monomer.The adjustable moving blade is opposite to static blade in initial state, in the resonant cavity of fixed size, for ordinary integrity moving blade, the opposite distance between it and static blade is completely fixed, the working frequency of filter only depends on the opposite area between moving blade and static blade, and the tuning range is limited.The adjustable moving blade described above is spliced by multiple discrete sector metal sheets, not connected each other, each metal sheet monomer can be individually moved by tweezers or flat-nose pliers, so that the opposite distance between it and static blade is variable, the capacitance of resonant cavity can be finely adjusted by adjusting the distance between metal sheet monomer and static blade, so that the resonant frequency of resonant cavity can be accurately changed.