31 results about "Hydrodynamic pressure" patented technology

The invention relates to a stress calculation method, device, equipment and medium for a floating type draught fan foundation structure, and the method comprises the steps: carrying out the frequency domain potential flow water power analysis of a wet surface element model of a foundation floating body of a floating type draught fan, and obtaining the water power pressure distribution and a water power coefficient; boundary conditions are applied to the simulation model of the floating type wind turbine foundation structure, various working conditions are loaded, finite element analysis is carried out based on hydrodynamic pressure distribution, and various structural stress transfer functions are obtained; based on the hydrodynamic coefficient, performing linear processing on the fan aerodynamic force, the impeller pneumatic torque, the floating body hydrodynamic force and the mooring restoring force of the floating fan and the influence of a fan servo controller on the floating fan, and substituting a linearization result into a motion equation of the floating fan for calculation to obtain a plurality of dynamic response spectrums; and multiplying the structural stress transfer functions by the corresponding dynamic response spectrums, and adding a plurality of multiplied results to obtain a total stress spectrum. The method can improve the efficiency.

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 discloses a kind of magnetic liquid double-suspension mixed-flow blood pump, comprising: pump shell, impeller, for driving impeller rotation drive motor, front magnetic bearing and rear magnetic bearing, pump shell is provided with pump outer tube, coaxially nested in pump inner tube in pump outer tube and is communicated in the pump cavity of pump inner tube lower end;Impeller includes the screw rod type impeller of front section and the vertical sheet type impeller of rear section, screw rod type impeller is coaxially arranged in pump inner tube, and vertical sheet type impeller is arranged in pump cavity;Vertical sheet type impeller has multiple vertical blades in radial, and the upper and lower end surfaces of multiple vertical blades are all provided with inclined surface, and two inclined surfaces on each vertical blade and the upper and lower two sides of the inner wall of pump cavity are all formed with wedge-shaped hydrodynamic pressure structure with big upcurrent port and small backflow port.The application magnetic liquid double-suspension mixed-flow blood pump adopts double-suspension mechanism of magnetic suspension and hydraulic suspension, can improve the stability and reliability of blood pump, and also greatly improves the work efficiency.

The invention discloses a method for enhancing flowing and lubricating performance of lubricating oil of a rolling bearing, which comprises the following steps of: communicating a lubricating oil film convergence area and a lubricating oil film divergence area formed between a rolling body and two side surfaces of lintels by utilizing two slot gap type through cavities additionally arranged on each lintel; and the lubricating oil is driven to flow from the lubricating oil film convergence area of the lintel to the lubricating oil film divergence area through the slot-type through cavity by utilizing the pressure difference formed by the fluid dynamic pressure effect and the cavitation phenomenon, so that the flowing and lubricating performance of the lubricating oil is enhanced, and the extrusion jet between the rolling body and the lintel and the oil film cavitation degree are reduced. According to the method, the stable lubricating oil flowing self-enhancing effect near the friction surface can be achieved through the slot gap type through cavity additionally formed in the lintel, the extrusion jet and the oil film cavitation degree near the friction surface between the rolling body and the retainer are effectively reduced, and the lubricating oil near the friction surface can be organized more efficiently; friction resistance and abrasion conditions are reduced, and the heat dissipation capacity of the bearing is improved.

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.

The invention is suitable for the cross technical field of computational fluid mechanics and structural engineering, and relates to a nonlinear liquid sloshing proportion boundary finite element numerical simulation method, which comprises the following steps of: S10, tracking the motion of a liquid free surface by adopting a semi-Lagrange method, and deducing a nonlinear sloshing motion equation under pitching excitation by utilizing speed potential; s20, creating a nonlinear liquid sloshing model under a proportional coordinate system and establishing a proportional boundary finite element system equation; s30, performing time domain solution by using a second-order Runze-Kutta algorithm to ensure accurate time update of the physical variables and gradients thereof; and S40, simplifying the control equation and the boundary condition into a second-order ordinary differential equation by using a weighted residual method, obtaining the free liquid level elevation change by solving the equation, and calculating the hydrodynamic pressure on the liquid container by using a Bernoulli equation. The method is simple in process, the calculation process is convenient and efficient, and the prediction precision and efficiency of numerical simulation under the swing excitation working condition are effectively improved.

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.

The application belongs to the technical field of hydraulic engineering, and specifically provides a rock scouring test device and method based on Bernoulli's law and considering dynamic water pressure, which comprises a scouring bin mechanism, the scouring bin mechanism comprising a shell, one end of the shell being provided with a transition shell, and the lateral wall of the shell being circumferentially provided with a plurality of extension holes; a plurality of pulling mechanisms, each pulling mechanism comprising a pulling rod, one end of the pulling rod being connected with a test piece clamp, the other end of the pulling rod being provided with an operating rod, the operating rod being arranged perpendicularly to the pulling rod, the end of the operating rod being provided with an external thread, a nut being arranged on the operating rod and matched with the external thread, and a limiting piece being arranged on the operating rod; a pulling adjustment mechanism, the pulling adjustment mechanism comprising a ring, a plurality of arc-shaped holes being arranged on the ring and corresponding to the pulling rods, the operating rod being limited by the nut and the limiting piece after penetrating into the arc-shaped hole; and a water supply mechanism for supplying water to the scouring bin mechanism. The device and method can simply and conveniently simulate the condition of water flow scouring the rock joint surface and are easy to operate.

The application belongs to the field of hydrodynamic pressure polishing, and discloses a high-speed micro-gap polishing online measurement and control method and a measurement and control system thereof, which comprises the following steps: step 1, mounting a workpiece on a workpiece disc of a lifting force suspension polishing device, and installing a gap measurement and control device on one side of the lifting force suspension polishing device, wherein a high-speed camera in the gap measurement and control device faces the work disc of the lifting force suspension polishing device from the side; step 2, starting the suspension polishing device and the gap measurement and control device, polishing the workpiece by the suspension polishing device, and detecting the gap between the workpiece and the airfoil polishing disc by the gap measurement and control device at the same time; and step 3, polishing is completed, the motor is turned off, and the workpiece is taken out after the motor stops rotating. The high-speed micro-gap polishing online measurement and control method can measure the size of the polishing gap in real time during the polishing process, and adjust the polishing gap, thereby improving the polishing efficiency and quality.

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 disclosure provides a method and apparatus for iterative coupled hybrid experiments on fluid-structure interaction boundaries, applicable to fluid mechanics, solid mechanics, numerical simulation, and engineering fields. The experimental method includes: decomposing an initial fluid-structure interaction structure into multiple substructures, including physical and numerical substructures; determining the influencing factors of the experimental convergence index based on the response error between the physical and numerical substructures, where the response error characterizes the error between the input response information of the physical substructure and the output response information of the numerical substructure, and the influencing factors include the iterative algorithm and the substructures; updating the input response information, output response information, and substructures based on an algorithm optimization strategy and parameter update strategy using the iterative algorithm when the response error does not meet a preset error threshold, thereby obtaining the target structure; and determining the hydrodynamic pressure time history and target motion results based on the target numerical substructure, the target physical substructure, and the preset response flow.

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 a tunnel water inflow, water pressure and water temperature rapid testing device which comprises a measuring pipe joint, a data collecting pipe joint and a pumping system, the measuring pipe joint and the data collecting pipe joint are connected through a pipe joint connecting structure, and an end water inlet structure is arranged at the end of the measuring pipe joint. A device hole inner fixing structure and a bag type hole blocking structure are arranged on the outer side of the measuring pipe joint, and a plurality of water pressure sensors are arranged in the measuring pipe joint; a water pressure gauge, a flow velocity meter, a water thermometer and a data storage and transmission module are arranged on the data acquisition pipe joint, and liquid is pumped to the bag type hole plugging structure through the pumping system to form hydraulic pressure for hole sealing. According to the method, the water inflow and the water pressure are tested through advanced drilling in combination with the advanced geological forecast result, the testing efficiency is high, the speed is high, the accuracy rate is high, and the influence on the construction environment and progress is small. The device is comprehensive in function, high in integration, capable of measuring hydrodynamic pressure, hydrostatic pressure, flow velocity, water temperature and flow, convenient to transport and assemble, reusable and capable of saving resources.

The application provides a numerical calculation method for fluid-structure-foundation two-way coupling integration, and takes finite element calculation program FssiCAS, open source fluid calculation program OpenFOAM and open source coupling library preCICE as examples to realize the method. The method can realize real-time exchange of solid domain and fluid domain data in the numerical simulation process, can feed back the displacement deformation and seepage of the foundation and the structure to the flow field of the fluid domain in time, and can also transmit the hydrodynamic pressure acting on the surface of the foundation and the structure to the solid domain. The method can more reliably study a series of flow-solid fully coupled dynamic response problems including complex interactions between waves, marine structures and seabed foundations.

According to the vertical self-adaptive zero-gravity floating machining method and device, the output force of an air bearing air cylinder is adjusted by adjusting air pressure, upward acting force is provided for a connecting support, friction-free vertical guiding is achieved through an air floating module, and the effect of balancing the gravity of the device in the vertical direction is achieved; and zero-gravity floating is realized. The workpiece is horizontally placed and machined, the workpiece with the large size and mass can be allowed to be polished, and more flexible machining is achieved in combination with movement of the polishing mechanical arm. By adjusting the air pressure, the liquid film thickness and the fluid dynamic pressure can be indirectly adjusted, the material removal rate is adjusted, the system cost is reduced, and meanwhile polishing of sub-nanometer level surface roughness is achieved.

The utility model provides a corrugated steel sheet and metal rubber combined type controllable damping sliding bearing which comprises a bearing seat, a bearing bush, an oil supply ring, a corrugated steel sheet, a metal rubber damping ring, a power supply, a piezoelectric actuator and a driving block. The damping of the rotor system can be accurately regulated and controlled, so that synchronous vibration is stabilized, and the rotor system runs more stably; furthermore, the hydrodynamic effect is more remarkable through the eccentric design of the bearing bush.

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.

The invention discloses a grinding and polishing disc based on the fluid dynamic pressure effect, and belongs to the technical field of semiconductor material grinding and polishing, the grinding and polishing disc comprises a grinding and polishing disc body, the grinding and polishing disc body comprises an upper disc and a lower disc, the upper disc is provided with a grinding device and a polishing device, the upper disc is arranged above the lower disc, and the upper disc is connected with a lifting device and a rotating device; and a brittle material is placed on the lower disc. According to the grinding and polishing disc based on the fluid dynamic pressure effect, the problem that the production efficiency is low in the fragile material machining process is solved, by means of the fluid dynamic pressure effect, the blade exposure height of abrasive particles can be controlled by controlling the thickness of a dynamic pressure film, machining of different grades is achieved, and the machining efficiency is improved. And the two working procedures of grinding and polishing are reduced to be completed through one composite grinding and polishing disc, grinding and polishing are achieved by adjusting the radial position of the grinding and polishing disc, and errors caused by re-installation of fragile materials and polishing pads are avoided.

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.

This application relates to a cylindrical gas film sealing structure with toothed pressure-boosting grooves. The cylindrical gas film sealing structure with toothed pressure-boosting grooves includes: a rear end cap and a front end cap fitted onto a floating ring and a rotating ring; and several toothed pressure-boosting grooves arranged in an evenly spaced circular array on the outer circumferential surface of the rotating ring. Each toothed pressure-boosting groove includes a toothless feature groove area a and a toothed feature groove area b. Compared to the traditional straight groove design, this application creates several toothed pressure-boosting grooves in an evenly spaced circular array on the outer circumferential surface of the rotating ring. The toothed feature groove area b of the toothed pressure-boosting groove has a toothed structure protruding into the groove. The toothed structure forms a contracting channel along the gas flow direction, so that when gas flows from the toothless feature groove area a into the toothed feature groove area b, the cross-sectional area of ​​the flow channel decreases along the gas flow direction, thereby enhancing the hydrodynamic pressure effect, increasing the gas film buoyancy, improving the support for the floating ring, enhancing the gas film stability, and thus reducing leakage and improving sealing performance.

The application discloses a kind of deep water pier hydrodynamic load calculation method under the combined action of isolated wave and earthquake.The method comprises the following steps: calculating the horizontal velocity of water particles around the round pier, vertical velocity under the combined action of isolated wave and earthquake and the liquid level difference around the round pier under the combined action of isolated wave and earthquake;Calculate the hydrodynamic pressure under the combined action of isolated wave and earthquake;Calculate the hydrodynamic pressure under the combined action of isolated wave and earthquake;Calculate the hydrodynamic load of deep water pier under the combined action of isolated wave and earthquake.The physical meaning of each part of the calculation result is clear, and the combined action of isolated wave and earthquake is considered comprehensively, so that the calculation result obtained is more in line with the actual hydrodynamic load of deep water pier.

The present application relates to a kind of rock mass structure surface dry-wet cycle test device and test method under hydrodynamic pressure, wherein, test device includes the test box for placing sample, dynamic water control unit, drying unit, opening control unit and digital control system, test box includes box, multiple horizontal partitions and be located in the sample holder of corresponding placement cavity, sample holder includes the lower fixed frame of being fixed on the upper surface of corresponding horizontal partition and the upper fixed frame of being located on the side wall of box by vertical slide rail structure, upper and lower fixed frame between having test box air outlet and test box water outlet.The test device of the present application, by the opening data recorded by opening control unit, in the dry-wet cycle process, digital control system can monitor the flow rate, water pressure, water temperature and other parameters of circulating water and the temperature of air, and control water temperature, pressure, flow rate and other parameters, control the temperature and flow rate of dry air, while multiple groups of samples are tested.