77results about How to "Proof of stability" patented technology

The invention relates to a motor rotating-speed tracking control method based on a self-adaptive fuzzy neural network, wherein rotating-speed and current double closed-loop control is adopted, an outer ring is a rotating-speed ring, a sliding-mode control theory-based fuzzy neural-network controller (SMFNN) is designed, an inner ring is a current ring, and a PI (Proportional-Integral) controller is adopted; a fuzzy neural-network rotating-speed controller comprises two parts, wherein one part is a PID (Proportional-Integral-Derivative) controller, and the other part is the fuzzy neural network, online real-time learning is carried out through the fuzzy neural network by utilizing a parameter correcting method designed on the basis of the sliding-mode control theory, and the two parts jointly act to obtain the output ir of the rotating-speed controller, i.e. a difference obtained by subtracting the output iFNN of the fuzzy neural network from the output iPID of the PID controller is used as the output ir of the rotating-speed controller. The control precision and the anti-interference performance of a motor speed-adjusting system can be improved through the control strategy of the motor rotating-speed tracking control method.

A preparation method of a ZIF-8/carbon fiber composite material for adsorbing an aqueous organic dye comprises the steps of carrying out strong oxidation treatment on carbon fiber cloth or a carbon fiber monofilament by using nitric acid; uniformly mixing ZnO powder and 2-methylimidazole according to a certain molar ratio; grinding an obtained mixture at a room temperature; horizontally laying thecarbon fiber cloth on a glass plate; covering one layer of mixed powder prepared in the step 2 to the carbon fiber cloth; continuing to grind the obtained mixture; when a lot of uniform powder penetrate through filaments of the carbon fiber cloth, stopping grinding; putting second layer of carbon fiber cloth and third layer of carbon fiber cloth in the same manner; repeating the steps; covering aglass plate on a mixed body of the ground cloth or monofilament and the mixed powder in the step 2; closely wrapping the mixed body by using a tinfoil; clamping the mixed body by using a fishtail clip; putting the mixed body in a drying box to be heated for reaction; after a section of time, obtaining the MOF-loaded carbon fiber cloth or the MOF-loaded carbon fiber monofilament. The preparation method of the ZIF-8/carbon fiber composite material for adsorbing the aqueous organic dye, provided by the invention, is used for preparing MOF/carbon fiber composite materials for adsorbing the aqueous organic dyes.

The invention relates to a high-frequency multiphase interleaved conversion device and a control method, and belongs to the field of power electronics and electric drive. The device comprises a drive and power amplification unit, an EV (Electric Vehicle) manager module, an AD (Analog-Digital) sampling module, a DSP (Digital Signal Processor) processor, a serial port communication module, an HCI (Human-Computer Interaction) module, a DC (Direct Current) voltage detection circuit, a DC voltage conditioning circuit, a current detection circuit, a current conditioning circuit and a main circuit. The system adopts a double closed-loop control technology and a new topological structure to realize system stability and broad stability margin; three inductors at the front end of the topological structure work alternately, and the equivalent switching frequency is 6 times of the traditional switching frequency, so that the whole converter has high frequency, and the output voltage and the ripple amplitude and harmonic component of current are reduced; and the equal-time work of the three front-end inductors per unit time reduces the power requirements on power components IGBT (Insulated Gate Bipolar Transistor) and diodes, reduces the manufacturing cost of the whole device, and improves the application value of the DC converter.

The invention discloses a preparation method of a Chinese medicinal tablet for treating skin diseases. The preparation method comprises the following steps of: mixing and crushing raw materials; sieving with a 100-mesh sieve; granulating by taking 15% starch slurry as adhesive; tabletting under the conditions that the pressure is 70-90N, the granularity is controlled at 18-20 meshes and the moisture content is controlled at 4-6%; coating by using an Opadry AMB coating solution of which the concentration is 5% under the condition that the flow is 0.25-0.28kg/min; and then, preparing the Chinese medicinal tablet under the conditions that the temperature of a tablet core is 50 DEG C and the rotating speed is controlled at 7-9 revolutions/minute. The crushing yield is 98.9%, the disintegration time is controlled at 22 minutes, and the coating qualification rate reaches 98.8%. In the prepared Chinese medicinal tablet, the dissolution rate of Chinese medicinal components is improved by 45.2%, and the bioavailability is improved to 89.7%, thereby being suitable for industrialized production. By carrying out clinical verification on patients, compared with positive control drugs, the effect taking rate and the total effective rate are obviously improved (P<0.05).

The invention discloses a BVDV (bovine viral diarrhea virus) internal control typing fluorescent PCR (polymerase chain reaction) detection kit and a preparation thereof. By means of the primer design, a BVDV I, a BVDV II and a PCR template for monitoring internal control are obtained through single PCR amplification, a BVDV internal control typing fluorescent PCR detection system is established through the primer design, PCR amplification and optimization of reaction conditions, the BVDV I and the BVDV II can be independently detected or synchronously detected, and quality monitoring can be performed on the detection result. The prepared kit comprises two parts of a cDNA (complementary deoxyribonucleic acid) synthesis system and an SYBR fluorescent PCR amplification system. The minimum detection limit of the kit to three types of genes is 102 copy, the kit has better specificity and repeatability, the detection quality is ensured, and the kit has a better application value.

The invention relates to the technical field of hot pressed sintering preparation technologies of ceramic materials, in particular to a hot pressed sintering preparation technology capable of improving density of a ceramic material. The hot pressed sintering preparation technology comprises the following steps: putting presintered ceramic powder into a graphite sleeve mould, mounting a high-strength graphite pushing block at the lower part of the graphite sleeve mould, mounting a high-strength graphite upper pressure head at the upper part of the graphite sleeve mould, respectively placing high-strength graphite powder at contact positions between the presintered ceramic powder and the upper pressure head as well as the pushing block as isolation materials, putting into a hot pressed sintering furnace, and sintering according to a sintering technology. The hot pressed sintering preparation technology provided by the invention has the advantages that operation processing is simple, the high-strength graphite powder is easy to prepare, economical and environment-friendly; sintering density and uniformity of a ceramic cutter material prepared by adopting the hot pressed sintering technology are respectively greatly improved, so that the hardness of the material is also obviously improved; and the hot pressed sintering preparation technology is also applicable to development and preparation of structural parts such as wear-resistant ceramic and high-hardness ceramic and has great application potential in the fields of cutter materials, aerospace and the like.

The invention discloses a fault tolerance control system of an uncertain system with a performer fault. A sensor, a controller and a performer in the network all uses a time driven manner, sampling time are synchronized, possible packet loss in the network transmission process is taken into consideration, switches are added between the sensor and the controller and the controller and the performerrespectively to model data packet loss, a model of a controlled object is established, and whether the performer works normally is determined according to a performer fault matrix. The fault tolerance control system has the advantages of being stable, and capable of carrying out fault tolerance control effectively.

The invention relates to a compound sodium selenite-vitamin E oral nano-emulsion preparation for livestock and a preparation method thereof. The compound sodium selenite-vitamin E oral nano-emulsion preparation for livestock is prepared from the following raw materials by mass volume percent: 5 to 10% of vitamin E, 15 to 35% of emulsifier, 7.5 to 17.5% of auxiliary emulsifier, 0.1% of sodium selenite, 0.1% of antioxidant and preservative and the balance solvent. The sodium selenite-vitamin E nano-emulsion of the invention is clear and bright emulsion which consists of self-emulsified nano-particles and is a self-emulsified clear and transparent thermodynamically stable system; and the production process is simple and facilitates mass production.

The invention relates to a robust adaptive spatial flexible system expansion control method based on a neural network. The method comprises the steps that a dynamic model of a space fly-net robot suitable for the design of a controller is established; the controller input U of the dynamic model is designed under the condition that the state of autonomous maneuvering units is limited; for the designed controller, the stability of a closed-loop system is proved; and for the designed controller, the autonomous maneuvering units are proved to satisfy the state constraint. The method has the advantages that the actual condition of the state constraint, which is caused by tether connection, of the autonomous maneuvering units is considered; the robust adaptive distributed consistency control method based on the neural network is used to design the controller for the space fly-net robot during deployment under a bounded disturbance condition; four autonomous maneuvering units can achieve thedesired state while satisfying the state constraint; the synergy consistency of configuration is realized; the flutter of a flexible network is reduced; and a good flexible network type is maintained.

The invention relates to a method of fine processing of puffer fish. Firstly, puffer fish is cleaned and treated to remove blood, and then the detoxication treatment is performed by cutting off the fish fins, the mouth, the skin, the eyes, the gill and the viscera. Secondly, the edible part treatment is performed and comprises head, body and bone treatments. Further, the blood, the mucosa, the mucilage, the subcutaneous tissue, the fin, the skin, the mouth, the eyes, the gill and the viscera produced in the process are collected and placed in a dish for inedible parts. Finally, the treated muscle, head, rib and spinal bone are soaked in clear water for 3-6 hours at 0-2 DEG C (the soaking water is replaced for 3 times) and then placed in a dish for edible parts. The method reduces tetrodotoxin and inedible parts to the greatest extent, ensures the safety and sanitation of the processed puffer fish products, and ensures the safety and stability in edibility of puffer fish after long-term preservation.

The invention relates to a stable welding line device with covered welding. Both ends of a pedestal bracket are provided with plastic moulds. One side of the pedestal bracket is provided with a prerotation vane bracket, the elastic opening of which is provided with a prerotation vane. The organic structure of the invention is able to totally control the variable factors of a longitudinal seam, which makes the welding stable and reliable, so when the invention is in dry running and welding running, the invention is able to prove the welding stability of the device.

The invention discloses a photovoltaic system maximum power point tracking method based on nonsingular fast terminal sliding mode control, and belongs to the technical field of photovoltaic power generation. The method comprises the following steps: firstly, establishing a mathematical model of a Boost converter in a photovoltaic system, and obtaining a state variable of the photovoltaic system; searching a voltage corresponding to the maximum power point through a perturbation observation algorithm, and taking the voltage as a reference voltage; calculating a tracking error e1 between the photovoltaic output voltage and the reference voltage, and deriving the tracking error e1 to obtain an auxiliary tracking error e2; designing a novel non-singular fast terminal sliding mode surface, and combining an equivalent control law and an index reaching law to obtain a switch control quantity; and finally, carrying out stability analyzing on the controller. According to the method, improvement is made on the basis of a traditional sliding mode surface, the singular problem of a terminal sliding mode is avoided, global rapid convergence of the system can be achieved, and therefore the system has good dynamic performance and stability and high robustness.