16 results about "Hydrodynamic pressure" patented technology

This invention provides a method and system for stress analysis of subsea tunnel support structures, relating to the field of subsea engineering technology. The method includes: acquiring and comparing the differences between exploration data of the first geological layer after excavation and exploration data of the second geological layer before initial shotcreting of the tunnel cross-section to obtain fissure anomaly increment data; obtaining a first gain factor and a second gain factor affecting the formation of the water pressure field based on the first hydrodynamic pressure data and the fissure anomaly increment data; and continuously optimizing and adjusting the cumulative support strength corresponding to the corresponding support sub-process and the geological layer anomaly increment data corresponding to the second geological layer exploration data based on the first gain factor, the second gain factor, and the second hydrodynamic pressure data corresponding to each support sub-process in the initial support, to complete the stress reliability analysis of the initial support structure. The method and system provided by this invention can effectively ensure the safety of tunnel support.

The application provides a dam-reservoir hydrodynamic fluid-solid coupling simplified efficient calculation method and application, the reservoir is discretized by SBFEM or FEM, and the hydrodynamic pressure additional mass matrix is calculated; according to the physical meaning and characteristics of the additional mass matrix, the hydrodynamic pressure additional mass matrix is simplified, the calculation time consumption is greatly reduced, and the calculation efficiency is improved under the premise of ensuring good precision, the simplified efficient calculation and analysis of the dam-reservoir hydrodynamic fluid-solid coupling under the condition of earthquake can be realized, the numerical calculation result has higher precision, the coupling calculation time consumption is greatly reduced, an accurate and efficient method is provided for the dam-reservoir hydrodynamic fluid-solid coupling analysis and anti-seismic safety evaluation, and technical support is provided for the application of the dam fluid-solid coupling analysis method in practical engineering or large-scale dam dynamic fine analysis.

A method for measuring the hydrodynamic pressure of a bilge keel on a surface ship includes: 1. Determining the main structure and bilge keel structure of a ship model, with a scale ratio of λ, and determining the positions of n measurement nodes located on the lower surface of the bilge keel; 2. Modeling the ship model from step 1 and comparing the strain at each measurement node with the strain at the lower surface of the bilge keel by applying water pressure, and calculating the strain transfer coefficients C1 to C2 corresponding to the n measurement nodes. n 3. Construct the boat model from step 1, and conduct a water immersion test in the test tank to obtain the water velocities V1 to V at n measurement nodes. n The micro-strain με1~με at n measurement nodes was measured. n 4. Obtain the hydrodynamic pressure P at the measurement node of the ship model. i :P i =με i / C i , i = 1, 2, 3…n; V. Obtain the actual ship hydrodynamic pressure SP at the corresponding measurement node positions of the bilge keel on the actual ship. i And the actual ship's entry speed SV i SP i =λ×P i This allows us to obtain hydrodynamic pressure data for the bilge keel under different working conditions, which can be used to assist in bilge keel design and improve the reliability of the bilge keel structure.

The utility model discloses a dynamic water pressure measuring device. Comprising a shell, an end cover used for sealing the shell, a bearing plate located outside the shell and used for bearing dynamic water pressure, and a strain gauge arranged inside the shell and used for measuring the dynamic water pressure. The connecting rod is fixedly connected with the bearing plate, and one end of the connecting rod extends into the shell and is used for triggering the strain gauge; and the reset spring is arranged in the shell and is used for resetting the bearing plate. According to the utility model, the bearing plate is directly contacted with mud-containing water flow, the hysteresis effect caused by a permeable structure of a traditional water pressure sensor can be eliminated, the precision of a measurement result can be improved, the bearing plate does not influence the measurement result due to mud accumulation, and the overall practicability can be improved; according to the utility model, the reset spring is arranged, so that the bearing plate can be quickly reset, and the overall response speed and the measurement precision can be improved.

The invention discloses a stepped grinding and polishing processing method for regulating and controlling the removal scale of a plastic domain by a magnetic field, which comprises the following steps: starting an electromagnet device, regulating current to generate a magnetic field vertical to the surface of a workpiece, and enhancing the plastic domain range of the surface layer of the workpiece; the grinding depth of the grinding wheel is controlled to be larger than zero and smaller than the magnetic brittle-plastic transformation critical cutting depth, and grinding is conducted; the grinding depth of the grinding wheel is controlled to be zero, magnetic force rheological grinding and polishing liquid is supplied to a grinding area, and grinding-polishing combined machining is conducted on the surface of the workpiece; controlling the clearance between the grinding wheel and the workpiece surface to be greater than zero, and adjusting the magnetic field intensity according to the clearance to control the shear stress of the abrasive cluster; the abrasive clusters are formed by the synergistic effect of magnetic field force and a hydrodynamic pressure field; and the polishing depth is controlled to be smaller than the magnetic brittle-plasticity transformation critical cutting depth by adjusting the grinding wheel feeding depth, the rotating speed and the workpiece feeding speed, and the surface of the workpiece is polished. According to the method, the damage depth can be quantitatively controlled, positioning errors caused by secondary clamping are avoided, and the method is high in universality and easy to implement.

This invention provides a self-circulating flushing sealing assembly, method, and pump device, including a housing with a mechanical seal cavity, a rotating shaft, a sealing friction pair, and a partition structure. The rotating shaft is rotatably inserted into the housing and penetrates the mechanical seal cavity. The sealing friction pair includes a rotating ring disposed on the rotating shaft and a stationary ring disposed on the housing, and the rotating ring and stationary ring can fit and seal within the mechanical seal cavity. The partition structure divides the mechanical seal cavity into a communicating inner cavity and an outer cavity. The inner cavity is located outside the sealing friction pair. When the rotating shaft is rotating, fluid in the inner cavity can flow into the outer cavity under pressure and then flow back to the inner cavity to cool and / or lubricate the sealing friction pair. By placing the inner cavity outside the sealing friction pair, this invention allows the inner cavity to automatically generate stable hydrodynamic pressure when the rotating shaft rotates, thereby driving the fluid to form a self-circulating flow independent of external systems, continuously cooling and lubricating the sealing friction pair, and improving the working conditions of the sealing friction pair.

This invention provides a method for predicting linear wave loads in ship structural design, relating to the field of ship engineering structural design technology. Based on optimized Latin hypercube sampling and three-dimensional potential flow calculation, this invention constructs a dataset of hydrodynamic pressure fields and load components under regular wave conditions. It extracts the basis function system and establishes a linear mapping relationship between the combination coefficients and the loads. For irregular wave sea states, it interpolates to determine the state transition matrix and control matrix. Combined with the main wave disturbance force, it performs a time-series recursion of the combination coefficients, triggering local transient calculations at preset intervals, and performing sparse verification corrections on the recursive state. Finally, it outputs the load history in real time through the mapping relationship and statistically analyzes the extreme values ​​to generate a wave load design parameter table. This method replaces full-order solutions with low-dimensional recursion, triggering a small number of full-order verifications at preset intervals. While maintaining prediction accuracy comparable to full-order solutions, it significantly reduces computation time, providing efficient and reliable load input for ship structural design.

This fluid dynamic pressure bearing comprises a shaft, a sleeve, and a lubricant. An upper outer-peripheral surface and / or an upper inner-peripheral surface has an upper dynamic pressure fluid dynamic pressure bearing comprising upper dynamic pressure grooves that induce a fluid dynamic pressure in the lubricant during rotation. In a first upper dynamic pressure groove row, a plurality of upper dynamic pressure grooves, which are inclined to one side in a circumferential direction while proceeding upward in an axial direction, are arranged in the circumferential direction. A second upper dynamic pressure groove row is disposed adjacent to the first upper dynamic pressure groove row on the lower side in the axial direction, and a plurality of upper dynamic pressure grooves, which are inclined to the other side in the circumferential direction while proceeding upward in the axial direction, are arranged in the circumferential direction. A third upper dynamic pressure groove row is disposed adjacent to the second upper dynamic pressure groove row on the lower side in the axial direction, and a plurality of upper dynamic pressure grooves, which are inclined to the one side in the circumferential direction while proceeding upward in the axial direction, are arranged in the circumferential direction.

The application provides a soil dry-wet cycle device with hydrodynamic pressure regulation function and a test method, wherein the soil dry-wet cycle device comprises a test table, a support, a water pump, a water storage tank and an automatic dry-wet cycle mechanism, the automatic dry-wet cycle mechanism comprises a sealing top cover, a dry-wet cycle chamber, a dryer, a soil sample mounting unit and a controller, the soil sample mounting unit comprises a fixing structure, a microporous diaphragm bottom plate, a soil ring knife positioning sleeve frame and a microporous diaphragm top plate, the microporous diaphragm top plate and the microporous diaphragm bottom plate both have water-permeable and air-permeable structures, a first electromagnetic valve is installed on a water inlet pipe, a second electromagnetic valve is installed on a lower drain pipe, dryers are fixedly arranged at air inlets, and the controller is connected with the water pump, the dryers, the first electromagnetic valve and the second electromagnetic valve; and the application further provides a test method. The application can realize automatic quantitative research on the influence of dry-wet cycles on soil characteristics under different conditions in large quantities, and can also research the influence of different ions on soil characteristics in dry-wet cycles.

The application discloses a seabed slope model box for simulating seabed moving water pressure waves, which comprises a seabed slope model chamber, a moving water pressure wave device, a power equipment chamber and a weight lowering device. The weight lowering device can lift the moving water pressure wave device assembly to hit the water body at the bottom of the model box, so as to stimulate the moving water pressure wave generated by the fault dislocation caused by the seabed earthquake, and then the real marine water environment simulation around the seabed slope in the earthquake process is realized. The application has the advantages of simple structure, simple driving force provided by the weight stack, manual remote control of the moving water pressure wave stimulation time, and indoor seabed slope test conditions which are more in line with the actual working conditions and easy to observe the results.

This invention discloses a multi-media adaptable hydrostatic-dynamic coupling fluid suspension bearing assembly, system, rotating machinery, and operating method, belonging to the field of fluid suspension support technology. The bearing assembly includes a bearing body and a bearing housing forming a constant pressure fluid chamber. The working surface has axially arranged annular static pressure grooves and circumferentially distributed helical dynamic pressure grooves. At the intersection of their projections, fluid inlet micro-holes connecting to the constant pressure chamber are provided, forming a distributed matrix throttling network. The fluid inlet micro-holes include three forms: equal-diameter channels, classic Venturi, and simplified Venturi, flexibly adapting to conventional liquids, gas-liquid two-phase flows, and conventional gases. The bearing body has composite sealing components at both ends and an optional cooling system. This invention achieves multi-media compatible support through a unified core geometric framework and a mass-parameter adaptation system. Furthermore, the distributed micro-hole matrix and grid channel topology endow the bearing with parallel fault tolerance and passive flow pattern adjustment capabilities, significantly improving the bearing's adaptability to various operating conditions.

The invention discloses a device and a method for simulating deep hydrodynamic pressure wave generation and water-rock interface propagation action, and the device comprises a gas source device which is used for providing gas with different pressure intensities; the stress pulse excitation device is used for exciting multi-waveform dynamic stress waves; the hydrodynamic pressure wave excitation and fluid-solid coupling action device is used for exciting and transmitting hydrodynamic pressure waves and realizing hydrodynamic pressure wave propagation and action under high stress of a water-rock interface; the initial water pressure loading device is used for storing a fluid medium and providing initial pressure for the dynamic water pressure wave excitation and fluid-solid coupling action device; and the monitoring device is used for monitoring the parameter state of the hydrodynamic pressure wave generation and water-rock interface propagation action process. According to the invention, the propagation environment of different hydrodynamic pressure waves in deep rocks can be simulated, and the energy transfer, action and attenuation characteristics of the hydrodynamic pressure waves under the action of fluid-solid coupling can be studied.

A hydrodynamic load mapping loading method in energy-saving guide wheel structure analysis comprises the steps that firstly, hydrodynamic loads obtained through CFD analysis of a reduced scale model are extracted and expressed in the form of average pressure and pulsating pressure, data conversion from the reduced scale model to a real-scale model, formatting processing of hydrodynamic load data and mapping processing and application of the loads to the structure are carried out. In consideration of a load application mode, in order to conveniently extract model information such as a loading unit or a node required in a load processing process and in consideration of load processing complexity, an APDL language of ANSYS software is adopted to process load mapping application; meanwhile, when ANSYS software is adopted for structural analysis, all calculation tasks can be conveniently processed in the same software. The method can adapt to the CFD to calculate the dynamic water pressure by adopting the scale model, and the calculation efficiency of obtaining the water pressure in the CFD stage is greatly improved. The method is suitable for structural model unit grid division rules and irregularity conditions at the same time.

The invention provides perovskite blade coating equipment and application thereof. The perovskite blade coating equipment comprises an operation table, a blade coating assembly, a dropping liquid cleaning assembly, a placement assembly and a control device, a substrate resistance heating wire is mounted on the bottom surface of the placement table top to heat the table top, and a vacuum device provides negative pressure to fix a corresponding substrate; the liquid dropping cleaning assembly is provided with an electric liquid dropping device, a precursor solution storage device, a cleaning water tank, a spraying device and a fan; a scraper assembly of the blade coating assembly is connected to the bottom end of a piston rod of a blade coating push rod through a pull pressure sensor, a scraper switching motor is installed on a lifting frame to drive a star-shaped knife rest to rotate so as to switch a blade coating knife, and a knife head heating resistance wire is arranged in the blade coating knife. Automatic tool changing, temperature control and cleaning can be integrated, the fluid dynamic pressure model is introduced to control the downward pressure of the blade coating push rod, and the blade coating defect caused by fluid dynamic pressure is overcome.

This invention relates to the field of hydrodynamic calculation technology, and particularly to a method and apparatus for determining the dynamic water pressure around a heaving column. The method includes: dividing the area around the heaving column into an inner region and an outer region based on the column's radius, submersion depth, and water depth, with an interface between the two regions; constructing a system of linear equations based on the column's radius, heaving frequency, heaving velocity amplitude, submersion depth, water depth, and matching conditions at the interface; obtaining the internal velocity potential function of the inner region and the external velocity potential function of the outer region based on the linear equations; obtaining the dynamic water pressure of the inner region based on the internal velocity potential function; and obtaining the dynamic water pressure of the outer region based on the external velocity potential function. This technical solution provides a method for rapidly calculating the dynamic water pressure around a heaving column, improving the efficiency of pressure assessment.

The application discloses a kind of variable sliding speed local submergence type landslide surge dam face hydrodynamic pressure test method, comprising the following steps: (1) establish the physical model of landslide surge in line with topographic features;(2) use 3D printing to make sliding surface of different materials;(3) dam wave height tester and hydrodynamic pressure sensor are arranged at dam face;(4) carry out landslide surge physical model test under different sliding speeds;(5) data analysis is carried out to the maximum climbing of surge and the maximum hydrodynamic pressure distribution on dam face under different sliding speeds, the interrelationship of surge climbing and dam face hydrodynamic pressure distribution is obtained, and the maximum hydrodynamic pressure distribution under different surge climbing of dam face can be obtained using the relationship. The application solves the problem that the sliding speed of local submergence landslide cannot be adjusted and the maximum hydrodynamic pressure distribution on dam face is difficult to obtain in engineering, and provides an effective way for accurately evaluating the impact of landslide surge disaster.