25results about How to "Small fluctuation range" patented technology

The invention discloses a control system for a phase-locked loop-free synchronous tracking mode of a hybrid network following-construction system, and belongs to the technical field of virtual synchronous generator control, phase angle information generated by network construction type control is used for synchronization of a network following type inverter, and synchronization of the network following type inverter is realized without a phase-locked loop. According to the control technology, potential unstable factors caused by the dynamic state of the phase-locked loop can be avoided, and meanwhile, the two inverters of the following network and the constructing network have better transient performance. According to the improved scheme, an ideal voltage source on the direct current side of the inverter is replaced by a boost circuit controlled by a single current loop, and a direct current voltage loop is added to an active loop controlled by a network constructed on the alternating current side. Compared with the control technology provided by the invention, the improvement enables the control technology to have no frequency steady-state deviation and have better transient and steady-state performance.

The invention provides an automatic control system for acid mist absorption of industrial waste gas and a use method. The control system comprises a waste gas tower, a fan, a circulating pump set, a liquid alkali pump, a pressure sensor, a pH meter, a liquid level meter, an electric valve, a regulating valve, an operation screen and a central processing unit. According to the acid mist absorption automatic control system for the industrial waste gas, the pressure of the waste gas is obtained through the central processing unit, the working frequency of the fan is adjusted through a preset pressure value, and the rate of the waste gas entering the waste gas tower is stabilized. According to the pH value in the waste gas tower, the addition amount of the liquid caustic soda is adjusted by adjusting the adjusting valve through the operation screen arranged on an operation site or the central processing unit, so that the pH value in the waste gas tower fluctuates smaller, the adjusting range is more accurate, and the comprehensive efficiency of waste gas treatment is improved. Besides, according to the using method of the automatic control system, the control system can be automatically controlled and run according to a preset method, unified management of the system is achieved, and the stability in the standard gas emission process is ensured.

The invention relates to a hybrid competition dynamic time slot allocation method and system based on BiConv-LSTM in combination with an improved ant colony algorithm. The method is suitable for a distributed communication node to construct a communication system, and comprises the following steps: a base station allocates a fixed time slot to sensor equipment for initialization, and creates a time slot allocation table to store fixed allocation; carrying out ant colony algorithm initialization by combining a BiConv-LSTM module; an optimal scheme is explored by improving an ant colony algorithm, and the method comprises the following steps: initializing global pheromone concentration, and creating a pheromone table; after the whole ant colony completes one-time search, whether a new optimal scheme exists or not is judged; judgment is carried out during re-iteration; determining a time slot allocation scheme, wherein the time slot allocation scheme comprises updating a time slot allocation table by using the optimal path scheme; judging whether a sensor occupies a competitive channel for a long time; and allocating a time slot to the sensor equipment according to the allocation scheme and sending a message. Factors such as flow, time delay and interference are fully considered during path selection, and meanwhile, the convergence speed is effectively improved.

The invention relates to the technical field of aluminum alloy preparation, in particular to a 7075 aluminum alloy sheet and a preparation method thereof. The preparation method comprises the following steps: A) melting raw materials with specific components, and preserving heat at 720-760 DEG C; (B) carrying out furnace bottom degassing refining on the obtained melt, and then filtering; c) carrying out grain refinement on the obtained melt by adopting a refiner; d) casting the obtained melt under specific casting parameters to obtain a cast ingot; the method comprises the following steps of (1) carrying out primary soaking treatment on a cast ingot, (2) carrying out secondary soaking treatment on the cast ingot, (3) carrying out secondary soaking treatment on the cast ingot, and (4) carrying out rolling deformation on the treated cast ingot to obtain the 7075 aluminum alloy sheet. The cast ingot prepared through the method is fine in grain and compound and more dispersed and uniform in tissue distribution, and the finally obtained 7075 aluminum alloy sheet is stable in mechanical property and small in fluctuation range.

The embodiment of the invention provides a control method of a voltage converter and an energy storage system. The method comprises the following steps: a controller obtains accumulated required power of any control period; the controller judges whether the accumulated required power is greater than or equal to a set sending power threshold value; if the controller judges that the accumulated required power is greater than or equal to a sending power threshold value, the controller sets the output power as the accumulated required power; if the controller judges that the accumulated required power is smaller than the sending power threshold value, the controller sets the output power as a set value, and the set value is smaller than the sending power threshold value; the controller controls whether the voltage converter works or not according to the output power. According to the embodiment of the invention, the stability of power supply is improved, and the electronic equipment connected to the energy storage inverter is protected; generation of electromagnetic interference is reduced, and electromagnetic compatibility of the system is improved.

This invention discloses a control method and device for a solar-fossil fuel complementary energy storage power generation system. The method includes the following steps: in response to a start command, acquiring the transfer parameters of the controlled object; acquiring a first input value and a first output value of the controlled object; inputting the first input value and the first output value into an extended state observer to obtain observation parameters; acquiring a first preset output value of the controlled object; calculating a second input value based on the first preset output value, observation parameters, transfer parameters, preset tuning coefficients, and a preset error feedback control model; updating the first input value based on the second input value; outputting the updated first input value to the controlled object, acquiring the updated first output value, and returning to execute the third step. The control method and device disclosed in this invention can improve the efficiency of disturbance suppression, thereby reducing the fluctuation range of the controlled object's output and improving stability.

The utility model relates to a desuperheater, and aims to provide an automatic pressure stabilizing steam pressure reducer which has the characteristics that the steam pressure can be automatically adjusted, and the structure is relatively simple. According to the technical scheme, the automatic pressure stabilizing steam pressure reducer is characterized in that a lower sleeve coaxially arranged with an upper sleeve is fixed between the upper sleeve and an outlet channel; a valve clack in sliding fit with the inner wall of the upper sleeve is fixed to the bottom end of the valve rod, and a sliding sleeve which is in sliding fit with the inner wall of the lower sleeve and provided with an opening in the bottom end is coaxially fixed to the bottom end of the valve clack. A plurality of through holes for circulating steam are formed in the circumferential surfaces of the lower sleeve and the sliding sleeve; an adjusting cover in sliding fit with the inner wall of the lower sleeve is coaxially arranged below the sliding sleeve, and an elastic component exerts upward jacking pressure on the adjusting cover.

The present invention discloses a raw material for pressure transmission and sealing medium for synthesis of six-sided top press, and a preparation method and application thereof, and belongs to the field of synthesis technology of six-sided top press. With pyrophyllite as raw material, by removing impurities, crushing, and detecting components, and comparing the formula requirements, aluminum, iron, titanium and other elements are added to it so that the composition ratio reaches the ideal requirements, and then through screening, mixing, fermentation, pressing, drying and other process treatments, a pressure transmission and sealing medium block for synthesis of superhard materials is prepared. The pressure transmission and sealing medium block prepared according to this formula has good pressure transmission, sealing and heat preservation properties, can significantly reduce the operating pressure of the six-sided top press equipment, the fluctuation of heating power, improve the stability of the synthesis internal cavity, improve the quality of superhard material products, and at the same time reduce the consumption of the top hammer and the loss of the equipment, and reduce the production cost of synthetic superhard materials. The selection range of pyrophyllite ore sources for the raw materials of the synthetic pressure transmission and sealing medium is expanded, and the risk and procurement cost of enterprises in dealing with the shortage of high-quality pyrophyllite resources are reduced.

The invention discloses a smelting method of a low-sulfur copper-containing corrosion-resistant alloy, and aims to solve the technical difficulties that the yield of alloy elements is unstable and components are easy to segregate in the smelting process. The core of the technical scheme provided by the invention is that a'large-tonnage vacuum induction furnace + vacuum consumable electrode furnace 'double-vacuum combined smelting system is innovatively constructed by relying on the first 30-ton ALD imported vacuum induction furnace in China; and engineering mass production of the products is successfully realized through double precise regulation and control of alloy components and microstructures. The method has the beneficial effects that large-scale and engineering mass production of the corrosion-resistant alloy is successfully realized; chemical components are precisely regulated and controlled, so that the element yield stability is greatly improved; by means of refined management and control of a double-vacuum smelting system, the fluctuation range of alloy components is remarkably narrowed, high-quality steel ingots with uniform and consistent chemical components are finally produced by optimizing the process, follow-up product flaw detection standard reaching and performance stability are effectively supported, and macrostructures of finally forged bars are detected to meet relevant standards.

The application discloses a bridge operation modal analysis method based on structural dynamics and Gaussian process fusion, and can be used for bridge structure health monitoring. Acceleration sensors are arranged at key positions of the bridge to collect vibration responses in an operation state; mode force power spectral densities of each mode are extracted through frequency domain analysis as external excitation strength indexes. The indexes are taken as Gaussian process inputs and hidden variables are introduced to quantize influences of excitation changes on natural frequencies, damping ratios and vibration modes; an expectation-maximization algorithm is used to iteratively identify structural dynamics parameters and Gaussian process hyperparameters. Finally, the bridge modal parameters after excitation disturbances such as wind and vehicle flow are removed and the hyperparameters representing working conditions are obtained, and long-term tracking, evaluation and prediction of the bridge structure health are realized.

The utility model discloses a detection device for jet pressure of a nozzle. The detection device comprises a first mounting bracket and a rotating assembly which is arranged on the first mounting bracket and can rotate around a first axis; the rotating assembly comprises a detection plate and a stress plate which are connected with each other, and the stress plate is used for bearing spraying pressure of the nozzle to drive the detection plate to rotate around a first axis; the detection device further comprises a second installation support and a proximity switch which is arranged on the second installation support in a vertically movable mode, the proximity switch and the detection plate are arranged at intervals in the direction parallel to the first axis, and the proximity switch is provided with an upper limiting position and a lower limiting position. When the proximity switch is located at the upper limiting position, the rotation radius of the sensing area at the corresponding height of the detection plate is minimum; and when the proximity switch is at the lower limit position, the rotation radius of the sensing area at the corresponding height of the detection plate is maximum. The device for detecting the spraying pressure of the nozzle can meet the requirements of different bottle types on the fluctuation detection range of the spraying pressure of the nozzle, and is relatively good in universality.

The invention discloses a gas-fired steam fire control method and a transmission system, comprising an independent steam chamber, an intelligent automatic control system, etc. The intelligent automatic control system controls a steam generator by communication, and a steam output end of the steam generator is connected to a total steam output pipeline. The intelligent automatic control system automatically obtains real-time data of steam pressure and steam temperature at a steam output port and a gas flow rate at a gas inlet, and then determines whether the current output steam is in a constant pressure state, and regularly samples and calculates the steam temperature, calculus dp1 and gas flow rate, so as to ensure that the steam pressure value and steam temperature at the steam output port reach a constant pressure and a constant temperature, so that the steam pressure can be stably controlled within a preset pressure range P, thereby greatly improving the stability and safety of steam use, reducing manual maintenance and steam waste, achieving significant energy-saving effects, being economical and environmentally friendly, fully and effectively utilizing resources, avoiding energy waste, and achieving the purpose of intelligent energy saving.

The present application provides a preparation method of a liquid-conducting glass substrate and a heating element, wherein the liquid-conducting glass substrate is used to heat and atomize a liquid aerosol to generate a matrix, and the specific manufacturing method is as follows: subjecting the substrate to be processed to laser induction and corrosion for the first time to form a prefabricated hole of a first micropore, and the prefabricated hole has a prefabricated aperture; subjecting the substrate to be processed to laser induction and corrosion for the second time to form a second micropore, and the second micropore has a second aperture, wherein the process of subjecting the substrate to be processed to the second corrosion causes the prefabricated hole of the first micropore to expand from the prefabricated aperture to the first aperture, thereby obtaining a liquid-conducting glass substrate with liquid-conducting micropores of different apertures; forming a heating film on the first surface of the liquid-conducting glass substrate, and finally forming a heating element with different apertures. Through the above process, the porosity of the heating element can be precisely controlled in batch production, the fluctuation range is small, and the heating power can be precisely matched, thereby achieving a better atomization effect, which is suitable for large-scale standardized production.

The application provides a mobile robot self-learning robust control method based on a hybrid Kalman filter and belongs to the technical field of robots.The technical scheme comprises the following steps: step 1, a dynamic model of an uncertainty factor;step 2, real-time estimation of state parameters and model parameters of the mobile robot to optimize the original dynamic model;step 3, introduction of an adaptive forgetting factor recursive least square method to dynamically adjust filter parameters;step 4, design of a non-singular fast terminal sliding mode controller based on a saturation function as a system main controller;step 5, establishment of an error correction RBF neural network and introduction of an adaptive error learning strategy;step 6, completion of stability analysis and proof of the control system by means of Lyapunov stability theory and simulation experiment of the optimized model.The application effectively suppresses the chattering of the sliding mode control and significantly improves the control precision and robust performance of the four-wheel robot.

The invention discloses a waste acid recovery method of a nanofiltration membrane separation technology, which belongs to the technical field of waste acid treatment, recovery and reutilization, and specifically comprises a nanofiltration membrane group, a primary acid recovery pipeline, a secondary acid recovery pipeline and a residual acid recovery pipeline, the nanofiltration membrane group comprises a waste acid conveying pipeline, a plurality of primary membrane pipes and a plurality of secondary membrane pipes; according to the invention, a manner of treating the wastewater by adopting the nanofiltration membrane group is adopted to replace a manner of treating the wastewater by adopting a traditional diffusion dialysis method, so that the treatment capacity of waste acid is improved, the recovery rate of the waste acid is improved, and the difficulty of secondary wastewater treatment is reduced.

The invention discloses an automobile windshield washer fluid and a preparation method thereof, and the automobile windshield washer fluid comprises the following components by mass: 2%-10% of ethylene glycol, 3%-30% of ethanol, 0.02%-0.1% of a nonionic surfactant, 0.02%-0.1% of an anionic surfactant, 0.001%-0.5% of a slow release agent, 0.2%-10% of an antifogging agent, 0.001%-0.2% of a pH regulator, and the balance of water, totaling 100%. The antifogging agent is a mixture of polyvinyl alcohol and hydrophobic alkane silane. According to the invention, the antifogging agent is formed by compounding polyvinyl alcohol and hydrophobic alkane silane, so that the antifogging period of the glass can be obviously prolonged.

The utility model discloses a water source heat pump energy supply system which comprises a water source heat pump main machine, a heat source water pipeline is arranged on the water source heat pump main machine, and the system is connected with a sewage source through the heat source water pipeline. A filtering device and a water volume adjusting device are sequentially connected between the heat source water pipeline and the sewage source in series, the water volume adjusting device comprises a first water tank and a second water tank, the first water tank is a fixed water tank, the front end of the first water tank is connected with a water inlet, and the second water tank is assembled on a movable support. The first water tank can move up and down relative to the first water tank through the movable bracket; and the bottom of the other side, opposite to the water inlet, of the first water tank is communicated with the second water tank through a communicating pipe, so that the second water tank can adjust the water storage amount in the water amount adjusting device according to the communicating vessel principle through the action of moving up and down. The device has the advantages of high efficiency, energy conservation, stable and reliable operation, remarkable environmental benefit, good operation effect, remarkable economic benefit and easiness in popularization.

The invention relates to the technical field of rail transit oxygen supply control, and discloses a variable frequency cooperative control device and method for a membrane separation oxygen generation system of a plateau motor train unit, and the device comprises a variable frequency drive module, a multi-parameter sensing module, a cooperative control module and a redundancy protection module. The variable frequency driving module supports dual-mode operation of AC380V normal power supply and DC110V emergency power supply; the multi-parameter sensing module collects key parameters such as altitude and oxygen concentration in real time; the cooperative control module adopts a double-MCU redundancy design, and dynamically adjusts frequency conversion parameters through a working condition recognition algorithm and PID closed-loop control; and the redundancy protection module realizes double-circuit power supply seamless switching, fault diagnosis and smoke and fire linkage protection. The plateau adaptability, the control precision, the energy-saving effect and the operation reliability of the oxygen generation system of the plateau motor train unit are remarkably improved, and it is ensured that the oxygen concentration of a passenger room is stabilized within the target range of 23.5%-25.0%.

The present application relates to the technical field of conductive slip ring processing control, and discloses a multi-station processing intelligent production control system for conductive slip rings, comprising a servo pressure connection device, a multi-temperature zone curing device, an electrical performance testing device, a conveying mechanism, a material carrier and a main control unit. The main control unit collects time sequence mechanical and displacement signals in the pressure connection stage and synthesizes a predicted deformation vector; collects time sequence dielectric coupling impedance signals in the curing stage to determine a gelation characteristic moment and a compensation time window, calculates target temperatures for each temperature zone according to the predicted deformation vector and outputs temperature distribution control instructions; collects time sequence dynamic contact resistance signals in the testing stage and extracts harmonic characteristics, and performs thermal compensation response model identification and parameter correction. Through the present application, a feedforward compensation and closed-loop control mechanism between the pressure connection, curing and testing processes is established, deformation caused by mechanical residual stress is compensated, and contact resistance fluctuation of the finished conductive slip ring is reduced.

The utility model provides a pulverized coal steady-flow conveying device. The pulverized coal steady-flow conveying device comprises a pulverized coal bin, a steady-flow bin, a rotor scale and a steady-flow unit. The pulverized coal bunker comprises a columnar part and an inverted cone part which are vertically communicated, the bottom of the inverted cone part is communicated with the top of the steady flow bunker, and a bottom outlet of the steady flow bunker is communicated with the rotor scale. The flow stabilizing unit is arranged in the inverted cone portion of the pulverized coal bunker and comprises a flow stabilizing cone and a plurality of fixing rods, the tip end of the flow stabilizing cone vertically faces the columnar portion, the fixing rods are circumferentially arranged on the outer side of the lower portion of the flow stabilizing cone, and the ends, away from the flow stabilizing cone, of the fixing rods are connected with the inner wall of the inverted cone portion. According to the invention, stable output of pulverized coal is realized.

The present invention relates to the technical field of hydraulic stations, and specifically to a hydraulic station cooling system with an integrated design, comprising an oil storage tank, a hydraulic oil pump and a distribution valve assembly arranged on the oil storage tank, the hydraulic oil pump extracts hydraulic oil in the oil storage tank and transports it to the distribution valve assembly, the oil storage tank is provided with a control support pipe and a return support pipe, a connecting ring frame is connected between the control support pipe and the return support pipe, arc-surface heat-conducting disks are symmetrically arranged on both sides of the connecting ring frame, and the connecting ring frame cooperates with the arc-surface heat-conducting disk to form a closed cavity; the present invention can cool the hydraulic oil in the oil storage tank, and at the same time, can actively control the arc-surface heat-conducting disk to bulge when the hydraulic oil level is too low, so that the arc-surface heat-conducting disk bulges outward, increases space occupancy, thereby raising the liquid level and reducing the fluctuation range of the liquid level in the oil storage tank.

The invention discloses an all-electric solar unmanned aerial vehicle energy management method based on environmental information detection layering, and belongs to the technical field of power generation, power transformation or power distribution. The method comprises the following steps: processing environment information by utilizing a per-unit thought; obtaining influence factors of the environment information all-electric solar unmanned aerial vehicle energy system through linear regression analysis, and layering the environment information according to the influence factors; training and fitting known illumination intensity, equivalent load and bus voltage data by using a neural network to obtain all mapping relationships under different environmental information levels; and executing a hierarchical control strategy according to the DC bus voltage predicted by the mapping relation under each environment information level. According to the invention, the switching speed of the all-electric solar unmanned aerial vehicle among different working modes is accelerated, the overshoot of the bus voltage during mode switching is reduced, and the normal work of the unmanned aerial vehicle in a severe environment is ensured.

The plunger pump comprises a pump head and a valve assembly, the valve assembly is arranged in the pump head, a main cavity is formed in the pump head, a plunger is arranged in the main cavity, one end of the plunger is connected with a power source, the power source drives the plunger to axially move in the length direction of the plunger, and the power source drives the plunger to axially move in the length direction of the plunger. The end, away from the power source, of the main cavity is provided with a plug assembly used for sealing the main cavity. The chock plug assembly comprises an outer chock plug and an inner chock plug, the outer chock plug and the inner chock plug are both connected to the end, close to the main cavity, of the pump head, and a self-balancing cavity is formed between the outer chock plug and the inner chock plug; a one-way valve is arranged on the inner chock plug and allows a medium to enter the self-balancing cavity from the main cavity. The plunger pump has the advantage that the service life of the plunger pump for improving alternating pressure sealing is prolonged.

The utility model relates to the field of water sample collection, in particular to natural water area water sample sampling equipment capable of stratified sampling, which comprises a floating object, the lower end of the floating object is fixedly connected with a traction rope, the lower end of the traction rope is fixedly connected with an adjusting assembly, and the lower end of the adjusting assembly is in threaded connection with a water taking device. The multiple adjusting assemblies and the multiple water taking devices are sequentially arranged, the water taking device at the tail end is fixedly connected with a balancing weight through a traction rope, and a positioning chip is arranged in the balancing weight. The traction rope is wound on the traction wheel, so that the distance between the water taking devices is changed, the water taking depth is controlled, the number of water samples can be freely selected through a freely-detachable threaded connection mode, the water taking devices can be kept to be perpendicular through the balancing weight, the fluctuation range of the water taking devices is narrowed, and the water taking device is convenient to use. The water taking device tends to be vertical after taking water, the depth is determined through the positioning chip, and the sampling depth can be controlled more accurately by using the adjusting assembly in a matched mode.

The invention relates to the technical field of water yield control of instant heating type water drinking equipment, and discloses a control method and device, a computer readable storage medium and the instant heating type water drinking equipment. The control method comprises the steps that the instant heating type water drinking equipment is controlled to start to discharge water, and the real-time driving voltage of a water pump of the instant heating type water drinking equipment is obtained; and substituting the real-time driving voltage into a water outlet flow velocity-water pump voltage corresponding relation graph of the instant heating type drinking water equipment established in a database to obtain real-time water outlet flow velocity, accumulating the real-time water outlet flow velocity according to unit time, and converting to obtain the water outlet quantity of the instant heating type drinking water equipment. And judging whether the water outlet amount is greater than or equal to the target water taking amount, and if yes, controlling the instant heating type drinking water equipment to stop discharging water. The real-time driving voltage of the water pump is used for obtaining the real-time water outlet flow speed, the water outlet amount is obtained by accumulating the real-time water outlet flow speed, external devices such as a flow meter do not need to be arranged for detecting the water flow, the equipment cost is saved, and pollution of the external devices to a water source is also avoided.