384 results about "Fluid power" patented technology

The invention discloses a tunnel ventilation control system and method based on artificial intelligence, and relates to the technical field of ventilation control, and the method comprises the steps: in a tunnel design stage, building an unsteady-state computational fluid dynamics model based on tunnel three-dimensional linear parameters, calculating turbulence structures under different traffic conditions through a large eddy simulation method, and calculating an unsteady-state computational fluid dynamics model; determining an optimal space configuration scheme of the fan group according to the distribution of the velocity field and the pressure field; in the tunnel construction stage, multiple types of sensor arrays are arranged along the vault and the side wall of a tunnel in a layered mode; in the tunnel operation stage, real-time vehicle tracks and speed distribution information of a traffic monitoring system are obtained; establishing a ventilation demand dynamic prediction model based on space-time correlation analysis, constructing a fan cooperative control model considering airflow organization optimization, and solving an optimal operation strategy by adopting a multi-target adaptive weight distribution algorithm; when a fire characteristic signal is monitored, the multiple sets of fans are coordinated to form a relay type smoke exhaust airflow organization.

The invention discloses a Fluent-based numerical simulation and experimental design method for shaking of liquid in a tank of a tank truck, and belongs to the technical field of numerical simulation of fluid dynamics (CFD). The method includes the steps that the hole opening position of the wave-proof plate serves as an independent variable, multiple hole opening position schemes are designed, liquid shaking related indexes are determined to serve as dependent variables, a geometric model is established according to the actual structure of a tank truck tank body, a fluid mechanics model and boundary conditions are set, a solver is configured, output parameters and numerical simulation initial values are set, and an experiment is executed. The liquid shaking process of a certain swash plate trepanning scheme is simulated, acting force data, namely shaking index data, between liquid shaking and the inner wall of the tank body is recorded, the advantages and disadvantages of each trepanning position scheme are evaluated based on the shaking index data, and the optimal scheme is determined. According to the method, a real object experiment is replaced by CFD numerical simulation, parameter setting is carried out, the experiment cost and the experiment risk are remarkably reduced, the experiment efficiency is improved, and data support can be provided for industry design.

The invention discloses a method for optimizing key structure parameters of a deep well electric submersible pump based on performance simulation, and relates to the technical field of design optimization of electric submersible pumps, a three-dimensional geometric model of a deep well submersible centrifugal pump is built in advance, the three-dimensional geometric model comprises an impeller, a guide shell, a pump shaft, a pump shell, an upper connector, a lower connector and a full-flow-channel structure, and initial structure parameters are calibrated; and establishing a centrifugal pump simulation model based on a computational fluid dynamics technology, performing fluid domain extraction, grid division and grid independence verification on the three-dimensional geometric model, and setting fluid attributes, boundary conditions and a turbulence model. According to the method, a closed-loop iteration framework for simulation, optimization, evaluation and feedback is constructed by adopting a mode of coupling a computational fluid dynamics simulation technology and a genetic algorithm, the limitation of local parameter optimization in the prior art is broken through, systematic and collaborative optimization of key structure parameters of the submersible centrifugal pump is realized, and the method is suitable for large-scale popularization and application. And the efficiency of the optimization process and the final optimization effect are obviously improved.

The invention discloses a self-adaptive air pressure regulation and control system of quartz sand unpowered powder selecting equipment, and relates to the technical field of automatic control. According to the method, wind pressure and airflow disturbance signals are collected, a high-resolution map is generated through Hampel filtering and noise reduction, features are extracted through the convolutional neural network, key influence areas are identified, the problem of unstable wind pressure caused by airflow disturbance in a mountainous area is solved, and the particle separation precision is improved; a natural potential energy distribution matrix is constructed based on building floor height difference, velocity field reconstruction and airflow channel optimization are driven, technological parameters are adjusted in combination with a gradient descent algorithm, precise utilization of natural potential energy is achieved, energy consumption is reduced, uneven efficiency is improved, airflow distribution is simulated through a fluid dynamic model, and sedimentation behaviors are analyzed and predicted through particle trajectory. A support vector machine is used for classifying tracks and generating regulation and control instructions, PID control is used for stabilizing air pressure to form a closed loop, the problems that fine powder is mixed with coarse powder, coarse particles are left and the like are avoided, the equipment blockage risk is reduced, and the product purity stability is improved.

The invention provides a method for regulating and controlling a hydrodynamic balance valve with a real-time load feedback function, and the method comprises the steps: collecting the strain, water level, gas, vibration and motor current data of the balance valve in real time, constructing and utilizing a comprehensive load balance model, and calculating the effective safety torque of the balance valve in real time at an edge calculation layer; a mechanical wear degradation factor is calculated based on the action history and the current variance of the locking mechanism, and the instantaneous instability risk probability is calculated in combination with the effective safety torque and the current locking torque; according to the instantaneous instability risk probability, an output mode of a locking mechanism is dynamically adjusted to execute a graded locking action; and periodically calculating a full-life-cycle health degree index, and automatically generating a maintenance or replacement work order when the full-life-cycle health degree index is lower than a preset threshold value. According to the invention, the conversion from passive alarm to active defense is realized, and the safety and operation and maintenance efficiency of the urban balance valve in rainstorm, heavy load and corrosion environments are obviously improved.

The invention relates to the field of transformer overload control, in particular to a method and system for dynamically evaluating the overload capacity of a transformer, and the method comprises the steps: firstly, precisely extracting load step features and eliminating interference through a high-precision collection and sliding window differential verification technology; then, operating a finite-state machine based on a fluid dynamics principle, and switching among three modes of steady-state coupling, inertial decoupling and linear recovery according to load change; especially, a decoupling mode is entered during load impact, adiabatic temperature rise is utilized to deduce and replace lagged actually measured top oil temperature, and the problem of calculation distortion of a traditional model during oil flow lagging is effectively solved. In addition, the system executes double-thread calculation of the standard model and the inertial sensing model in parallel, outputs the final hot spot temperature through the maximum arbitration logic, and deduces the remaining allowable operation time according to the final hot spot temperature so as to generate a protection control signal. According to the invention, the evaluation accuracy and the operation safety of the transformer under the short-time overload condition are obviously improved.

The invention relates to the technical field of hydraulic support auxiliary equipment monitoring, in particular to a hydraulic support concentrated solution state online monitoring intelligent supplementing system which comprises a basic monitoring unit, a core calibration unit and an intelligent supplementing control unit. A basic monitoring unit collects multi-position flow velocity signals and sampling point concentration original data through a circulating pipeline built-in sensor, and a core calibration unit constructs a layered flow velocity weight model based on pipeline fluid dynamic characteristics, divides a central high flow velocity area and a near-wall low flow velocity area, dynamically distributes concentration weight coefficients of the two areas, and performs calibration on the flow velocity signals and the sampling point concentration original data. Data are processed through a weighted fusion algorithm, an actual concentration estimated value is output to eliminate detection negative deviation caused by flow velocity layering, an intelligent supplement control unit takes the value as a target threshold value to construct a trend prediction model, and when the concentration is continuously lower than the threshold value, a dual-constraint mechanism is started to generate a valve opening instruction; the concentration of the concentrated solution is stably maintained in an anti-rust and anti-foaming critical threshold range, and stable operation of the hydraulic support is guaranteed.

The invention relates to the technical field of oxygen production, and discloses an air suspension oil-free VPSA oxygen production system and method based on multi-dimensional closed-loop control, the system adopts a buffer-tank-free direct connection architecture, and a real-time surge margin is calculated through a sensing reconstruction module, and a power bypass module is driven to dynamically match fluid impedance to suppress surge. A thermal control buffer module is introduced, cooling adjustment is locked under the sensitive working condition through dynamic thermal interlocking logic, and temperature fluctuation is buffered and stabilized through thermal capacity. And the central decision-making module executes a density compensation and time sequence feedforward strategy, and preadjusts the torque of the compressor and the opening slope of the valve according to the air inlet density and the process time sequence. The closed-loop control logic based on the real-time surge margin and the change rate of the real-time surge margin is utilized, the high-speed unloading valve is driven to provide a discharge channel when the system impedance abnormally rises, and the hydrodynamic instability caused by process switching of the direct connection system and the equipment overload risk caused by environment load change are effectively restrained.

The invention is suitable for the field of low-temperature gas ejection and fluid system optimization, and provides a Venturi ejector structure parameter optimization method of a nitrogen phase separator gas return pipeline for a large scientific device. According to the method, geometric variables such as a main nozzle angle, a throat diameter and a diffusion angle are subjected to parametric modeling, key performance indexes such as an ejection coefficient, ejected mass flow and temperature field uniformity are extracted based on computational fluid dynamics simulation, a multivariable response surface model is constructed, and global optimal solution search is performed through a genetic algorithm. In the system operation process, if flow field fluctuation exceeds a threshold value, parameter re-optimization can be triggered in real time, and self-adaptive adjustment of the structure is completed. The method has the advantages of being efficient in optimization, rapid in response, high in self-adaptive capacity and the like, is suitable for efficient injection and dynamic regulation and control scenes of low-temperature gas in a complex thermal system, and has wide engineering application prospects and popularization value.

The invention relates to the technical field of industrial process control and fluid dynamic measurement, and discloses a high-precision liquid flow detection method based on a sensor. The method comprises the following steps: arranging a sensor, initializing a measurement section, receiving an ultrasonic signal, extracting a phase difference updated along with time, executing two-point temperature calibration, converting liquid temperature and correcting sound velocity, and obtaining static propagation time delay and a theoretical phase; constructing a net phase difference, inverting an axial instantaneous flow velocity according to a propagation difference, and applying non-negative and upper bound constraints; collecting pressure fluctuation to estimate a turbulence equivalent speed and superposing the turbulence equivalent speed with the main speed; calculating the volume flow according to the cross section area and accumulating the volume; phase anomaly, temperature rate and pressure peak detection is carried out, and substitution, recalculation and interpolation are adopted respectively; and counting and normalizing the maximum values of the speed and the flow, and outputting the speed, the flow, the accumulated volume and a normalized curve.

To provide a dynamic pressure bearing excellent in bearing rigidity at low cost.SOLUTION: A dynamic pressure generating part P is provided on each of two radial bearings A1, A2 provided at an interval in the axial direction, and a large diameter cylindrical surface 8b having a diameter larger than that of the radial bearings A1, A2 is provided between the radial bearings LA, LA. In the dynamic pressure bearing (bearing member 8) in which the dynamic pressure generating portion P is formed of a concavo-convex surface in which a plurality of dynamic pressure grooves 10 extending in the axial direction and convex hill portions 11 are alternately arranged in the circumferential direction, one radial bearing surface A1 and the large-diameter cylindrical surface 8b are connected via a tapered surface 8c inclined with respect to the axial direction, and the other radial bearing surface A2 and the large-diameter cylindrical surface 8b are connected via a tapered surface 8d having an inclination angle with respect to the axial direction smaller than that of the tapered surface 8b. The dynamic pressure grooves 10 formed in the A2 of the other radial surface are open to the 8d of the tapered surface.SELECTED DRAWING: Figure 4

The application provides a floor grinding machine gear box guide plate structure parameter optimization design method, which is used for determining the optimal values of three radial clearances between the guide plate and the gear tooth top. Firstly, a parameterized gear box model containing clearance as a variable is constructed, and a gear oil stirring loss theoretical model is established based on the boundary layer theory and the fluid resistance theory; taking the maximum lubrication efficiency as the target and the oil stirring power loss not exceeding the set threshold as the constraint condition, a central composite design method is used to select representative sample points in the design space; through computational fluid dynamics simulation, a moving particle semi-implicit method is used for splash lubrication transient analysis to obtain performance data of each point; based on the simulation data, a high-precision proxy model is constructed; finally, under the condition of meeting the oil stirring power loss constraint condition, the maximum lubrication efficiency is taken as the target for optimization solving to obtain the optimal clearance combination. The method realizes the quantitative design from parameters to performance, and effectively replaces the traditional trial and error method.

Disclosed is an actuator for actuation of a fluid dispense valve in a pressurized fluid powered fluid dispensing device. The actuator comprising structure to generate a pressure differential between a first zone and a second zone. The zones being adjacent a valve member of the fluid dispense valve of the device such that upon generation of the pressure differential the valve member is moved from the zone of relatively higher pressure towards the zone of relatively lower pressure such that the valve is opened.

The utility model belongs to the technical field of stamping dies, and particularly relates to a fluid power cylinder and a die. The hydrodynamic cylinder is arranged on the die holder, a mounting plate is fixedly arranged at one end of the die holder, and the hydrodynamic cylinder comprises a through hole formed in the mounting plate and penetrating through the two ends of the mounting plate; the cylinder cover is arranged at the end, away from the die holder, of the mounting plate, and the two ends of the through hole are sealed through the cylinder cover and the die holder to form a cylinder cavity. According to the hydrodynamic cylinder, the die holder is adopted to replace a cylinder cover at one end of the hydrodynamic cylinder, the size of the hydrodynamic cylinder in the axial direction is reduced, and the requirement of the hydrodynamic cylinder for an installation space in the axial direction is lowered.

The application belongs to the field of microfluidic chemical analysis and separation technology, and particularly relates to a high-throughput full-automatic liquid-liquid countercurrent microextraction system, which comprises a plurality of countercurrent microextraction combinations, each of which comprises a suction filtration unit, a countercurrent microextraction unit and a fluid power unit; the plurality of countercurrent microextraction units realize multi-channel synchronous extraction, the suction filtration unit integrates filtration and negative pressure circulation to complete sample pretreatment, and the fluid power unit is composed of a suction pump, a plurality of peristaltic pumps and a plurality of capillary connectors to form a full-automatic flow path, so that the extraction process is unattended throughout the whole process. The application realizes mass transfer enhancement through the reverse staggered flow of the heavy phase downward and the light phase dropwise upward in the extraction tube, has the advantages of high-throughput, high automation, high extraction efficiency, compact structure, good reproducibility and the like, and is suitable for efficient enrichment and separation of trace components in complex samples such as food, environment, medicine and biological detection.

The invention provides semiconductor manufacturing equipment and a tail gas treatment method and system thereof. The semiconductor manufacturing equipment is provided with a process chamber and an exhaust flow path in fluid communication with the process chamber, and the tail gas treatment system is characterized by comprising a reaction medium adjusting unit which is configured to be in fluid connection with the exhaust flow path and used for controllably introducing a chemical modification medium into fluid in the exhaust flow path, the chemically modifying medium reacts with the process by-product in the fluid to produce a derivative having a higher stability than the process by-product; a hydrodynamic driving unit configured to generate a pressure gradient in the exhaust flow path in a direction away from the process chamber to move the derivative in the direction away from the process chamber; and the dynamic balance control unit is configured to adjust the medium introduction parameter of the reaction medium adjusting unit and the driving parameter of the fluid power driving unit according to the real-time pressure state in the process chamber.

The invention discloses a bidirectional automatic reversing fluid power generation device which comprises at least two horn mouths, a power generator system, a piston and a channel sealing ring. The horn mouth is connected with a pipeline, and a hole is formed in the pipeline; the generator system is communicated with a pipeline connected with the horn mouth; the piston is arranged in the pipeline between the horn mouths; the channel sealing ring is arranged on the inner wall of the pipeline and matched with the piston to achieve opening and closing of the channel. When fluid enters from one direction, the corresponding piston is pushed to move to open the channel in the direction, meanwhile, the piston in the other direction is pushed to make contact with the channel sealing ring to seal the channel in the direction, the fluid is forced to be guided to a generator system for power generation, and the fluid after acting is discharged from a hole in the channel where the generator is located. Through cooperation of the piston and the channel sealing ring, automatic reversing of the fluid channel is achieved, external control is not needed, the structure is simple, and reliability is high. The device can adapt to a wind power generation scene and a tidal power generation scene at the same time, can also be applied to various scenes such as electric vehicle auxiliary power generation and water surface floating power generation, and has wide applicability and good application prospects.

The application discloses a propelling system and an aircraft, wherein the propelling system comprises a power generation system and a distributed system; the power generation system comprises a pre-ionization device and a magnetic fluid power generation device; the pre-ionization device can ionize gas to generate ionized gas; the magnetic fluid power generation device is suitable for the ionized gas to pass through; the distributed system comprises a plurality of propellers; any one of the propellers is electrically connected with the magnetic fluid power generation device. The magnetic fluid power generation device is used to replace an internal combustion engine to drive a generator to generate power; when the ionized gas passes through the magnetic fluid power generation device, the magnetic fluid power generation device can directly generate electric energy, so that the electric energy can be generated without mechanical conversion, the energy conversion efficiency is improved, and the electric energy is easy to transmit, that is, the energy transmission efficiency is also improved.

This invention discloses a contact-separation triboelectric power generation device, method, and application based on a rotating shaft, belonging to the field of air-fluid power generation technology. This invention solves the problem of poor compatibility between the energy harvesting structure and rotational motion in current energy harvesting methods that install energy harvesters on rotating shafts and collect nearby air-fluid. The invention includes: a rotating shaft connection mechanism for connecting to the circumferential surface of the rotating shaft; a contact-separation triboelectric power generation mechanism for collecting air-fluid energy during shaft rotation and converting the collected air-fluid energy into electrical energy; and a support frame with at least one arc-shaped through-slot, within which are arranged a first fixed power generation component, a second fixed power generation component, and a movable power generation component, the movable component being movable along the axial direction of the rotating shaft within the arc-shaped through-slot. This invention features a simple configuration, good economy, and high fluid energy conversion efficiency, making it suitable for low-velocity or turbulent environments, such as confined spaces like train bogie shafts.

The invention provides a multistage unit inter-stage fault diagnosis method based on flow resistance characteristic identification, and belongs to the technical field of hydraulic machinery fault diagnosis. The problems that in the prior art, the internal structure of a multi-stage pump turbine is closed, and inter-stage faults are difficult to locate and determine can be at least partially solved. The method comprises the following steps: acquiring operating parameters of a unit and opening degrees of guide vanes at all levels in real time; calling a preset flow resistance characteristic analysis model based on a fluid dynamic mechanism, and calculating a theoretically shared water head of each stage of runner under the current working condition; meanwhile, the actual shared water head of each stage of runner is obtained; calculating a flow resistance deviation coefficient between the actual sharing water head and the theoretical sharing water head; and according to the numerical value interval of the flow resistance deviation coefficient, determining a fault type of a specific level. According to the method, hardware equipment does not need to be added, online accurate diagnosis of faults between sealing ring abrasion leakage and flow channel foreign matter blocking grades can be achieved only through algorithm analysis, and the operation and maintenance cost is remarkably reduced.

The present application belongs to the technical field of fluid intelligent control of numerical control machine tool, in particular to a numerical control machine tool external throttling monitoring system and control method. The system comprises a main liquid supply pipeline, a plurality of throttle valve units, and an integrated base fixedly connected with the inlet of the main liquid supply pipeline. The inside of each throttle valve unit is uniformly distributed with a thin film flow sensing sheet, and the outside is provided with a state indicator lamp for prompting the optimal throttle valve opening position. The method comprises: establishing a unified fluid dynamics and coordinate reference; determining whether the current opening needs to be adjusted based on the flow information and flow field distribution of the in-valve sensing sheet within the effective flow period, and guiding the operator to perform valve position adjustment through the state indicator lamp; and performing reset, recording and conservation strategy at the end of the event to ensure the implementability and reproducibility under different installation attitudes, different machining conditions and environments. The present application realizes adaptive throttling control of the external cooling / lubricating system of the numerical control machine tool, and improves the machining stability and fluid utilization efficiency.

This invention discloses a drag reduction and thrust reversal device, relating to the field of fluid dynamics technology. The invention includes a front drag reduction air intake assembly, an automatic rotary cutting assembly, two fluid delivery pipes, and the drag reduction and thrust reversal assembly. The automatic rotary cutting assembly is mounted on the front drag reduction air intake assembly. In this invention, the drag reduction and thrust reversal device, composed of the front drag reduction air intake assembly, the automatic rotary cutting assembly, the fluid delivery pipes, and the drag reduction and thrust reversal assembly, efficiently captures oncoming fluid through an inclined inlet at the front. A filter baffle at the inlet blocks large debris, which is then shredded and mixed by fluid-driven rotary cutting blades. The mixture is then transported through the fluid pipes to the end delivery pipes. Under the action of the tail jet pressurization device, the fluid forms a vortex and is ejected at high speed, generating reverse thrust. This converts oncoming resistance into propulsive power, directly propelling the ship forward, achieving the dual effects of drag reduction and thrust reversal, and converting drag energy into forward propulsion.

The application discloses a kind of coal powder pipeline blockage early warning method of thermal power plant, it is related to the field of electric power industry automation and condition monitoring technique, the present application automatically identifies the flow characteristic difference of different coal, and dynamically adjusts early warning threshold, avoid the false alarm caused by coal variety change;Adopt the way of generative adversarial network and computational fluid dynamics simulation combination, realize the virtual monitoring to key area such as elbow pipe, break through the limitation that only can rely on straight pipe section monitoring in the past;Through high-frequency sampling and cumulative sum algorithm, the transient abnormal capture ability is significantly improved, and the precursory characteristics of blockage can be found earlier;The linkage of hierarchical early warning mechanism and disposal suggestion makes the system not only can find problems, but also can provide targeted solution, greatly improves operation and maintenance efficiency, using software algorithm upgrade mainly, maximum utilization of existing hardware resources, reduces the transformation cost and implementation difficulty.

Low-profile spindle motor, which includes: a stationary motor component, comprising a base plate (10; 110), a shaft (12; 112) and an annular stopper component (18; 118) arranged at a free end of the shaft, a rotatable motor component (14; 114), a fluid dynamic bearing system for the rotary mounting of the rotatable motor component (14; 114) relative to the stationary motor component, comprising an upper fluid dynamic radial bearing (22; 122) and a lower fluid dynamic radial bearing (24; 124), wherein the upper and the lower radial bearings (22, 24; 122, 124) each have bearing groove structures (22a, 24a; 122a, 124a), and an electromagnetic drive system (42, 44; 142, 144) for driving the rotatable motor component (14; 114) about a rotational axis (40; 140), wherein the ratio between the height a of the spindle motor, defined by the distance between the underside of the base plate (10; 110) and the upper end face of the stopper component (18; 118), and the bearing span b, defined by the distance between the lower edge of the lower radial bearing (24; 124) and the upper edge of the upper radial bearing (22;122) greater than or equal to 1.53 and less than or equal to 1.66, characterized in that its height a is between 5 mm and 7 mm.;

The invention provides a joint simulation method for a water-jet propeller, and the method comprises the steps: building an electromagnetic transient field model through a Maxwell platform, building a circuit transient field model through a Simplorer platform, and calculating the electromagnetic thrust; an ANSYS Fluent platform is used for establishing a fluid dynamic model, and fluid resistance is calculated; constructing a motion control system in the Simulink platform, and embedding the field-circuit coupling model into the Simulink platform; calculating the rotor speed according to the electromagnetic thrust and the fluid resistance so as to update the dynamic grid; a driving signal is output according to the difference value between the fluid resistance and the control target so as to update the electromagnetic thrust; and data interaction is carried out between the Simulink platform and the Maxwell platform, between the Simulink platform and the Simplorer platform and between the Simulink platform and the Fluent platform through a UDP (User Datagram Protocol) communication protocol. A real-time closed-loop feedback mechanism of electromagnetism, a control strategy and fluid is established.

The invention provides an optimization method and system for a marine engine room ventilation system, and relates to the technical field of analogue simulation, and the method comprises the steps: constructing a ventilation system simulation model of a marine engine room; according to the structure information and the working condition information of the ventilation system simulation model, determining the total heat dissipating capacity of the equipment; determining a reference ventilation quantity and a ventilation quantity area distribution table according to the total heat dissipation quantity of the equipment; setting the reference ventilation quantity and the ventilation quantity area distribution table into a ventilation system simulation model; performing fluid dynamic simulation on the ventilation system simulation model to generate a problem list; the optimal ventilation system structure parameters are optimized and determined through a swarm intelligence algorithm by taking weakening of hot spots, reduction of dead corner volume fraction reduction and weakening of a backflow path as targets. Hot spot areas in the cabin can be effectively weakened, the volume fraction of ventilation dead corners is reduced, the short-circuit backflow phenomenon is weakened, and the overall energy efficiency and design reliability of a ventilation system are remarkably improved while safe operation of equipment is guaranteed.