20 results about "Hydrodynamic forces" patented technology

The invention provides a new class of transportation with a partially aerostatically supported ram air cushion ship (PASRACS) that can provide safe, fast, efficient global transport services with extraordinary comfort, luxury and amenities. The PASRACS employs inventive synergistic combinations of lift from aerostatic, aerodynamic, hydrostatic and hydrodynamic forces for different modes of operation ranging from a stationary floating configuration on a water surface, to flight in ground effect at high speed. A propulsion system can utilize hydrogen as an energy source driving fluid-dynamic thrusters, to enable zero carbon emissions operations. A transition method is provided for a PASRACS to transition from a floating mode to a takeoff mode to a flight in ground-effect mode in an inventive optimized manner. A transport method for multimodally transporting payload is provided with PASRACS vehicles and systems, with quick turn time operations enabled by the use of payload transfer transport modules and transfer vehicles.

Unlocking insights from Geo-Data, the present invention relates to improvements in sustainability and environmental developments: together we create a safe and livable world. Described are systems and techniques for high-speed multibeam echosounder (MBES) surveying using a gondola attached to a semi-displacement or planing hull vessel. A housing encloses a multi-head MBES transducer array, with a nose fairing extending from a maximum width of the housing and a tail fairing extending from a minimum width of the housing. A hydrofoil strut segment has first and second hydrofoil surfaces orthogonal to the housing, and includes at a first distal end a coupling for flush attachment to an upper surface of the housing and at a second distal end a coupler portion for attachment to the semi-displacement or planing hull vessel. The first and second hydrofoil surfaces can generate opposing hydrodynamic forces during high-speed MBES surveying by the semi-displacement or planing hull vessel.

A distributed high-fidelity simulation system for large-scale high-speed AUVs based on real disturbance data is proposed. Through a large-scale AUV virtual test vehicle subsystem, the system simulates the motion state of a real large-scale high-speed AUV physical prototype under the interaction of rigid body inertia, gravity, buoyancy, inertial hydrodynamic forces, centripetal force, Coriolis force, drag, thrust, rudder force, and external environmental disturbances. Collision attributes are added to the prototype through a physics engine. The system also utilizes an underwater 3D virtual environment subsystem to render a large-scale underwater environment, build dynamic and static obstacle visualization models, and simulate the generation of realistic ocean currents and wave disturbances with high fidelity. The simulation presents a realistic underwater environment for a large, high-speed AUV. A motion solution subsystem describes the transformation relationships between the fixed coordinate systems of all objects in the underwater virtual environment and solves the motion equations of the large AUV, synchronously updating its pose and velocity states. A data management subsystem manages various data generated during the simulation, supporting write and read data operations, and also manages and coordinates data communication between nodes, supporting receive and send data operations. A visualization subsystem loads and dynamically displays the underwater 3D environment and the large AUV virtual test vehicle model, synchronously updating real-time data curves and visualizing the AUV's motion trajectory.

The invention discloses a method for calculating the mass of attached water of a multi-cylinder array system. The method comprises the following steps: solving the velocity potential of a flow field when a single cylinder vibrates in water; according to the velocity potential of the flow field when the single cylinder vibrates in the water, solving the velocity potential of the flow field when the double cylinders vibrate in the water; according to the velocity potential of the flow field when the double-cylinder vibrates in the water, solving the hydrodynamic force borne by the double-cylinder when the double-cylinder vibrates in the water; according to the hydrodynamic force borne by the double cylinders when the double cylinders vibrate in the water, the hydrodynamic force borne by any single cylinder when the multiple cylinders vibrate in the water is solved; and calculating the mass of the attached water of any single cylinder according to the hydrodynamic force borne by the single cylinder when the multiple cylinders vibrate in the water. Based on the potential flow theory, the invention provides the multi-cylinder array system attached water calculation method which is high in accuracy, accurate and reliable, and the accuracy and efficiency of engineering design are improved.

The end faces of bearings feature slots in a transition zone. These slots improve the balance of hydrostatic and hydrodynamic forces between the bearing and a gear mounted on a journal supported by the bearing, thereby increasing film thickness and providing higher force at smaller distances. The slots also reduce end face wear caused by operating the gear pump under higher pressure conditions.

The invention provides a new class of transportation with a partially aerostatically supported ram air cushion ship (PASRACS) that can provide safe, fast, efficient global transport services with extraordinary comfort, luxury and amenities. The PASRACS employs inventive synergistic combinations of lift from aerostatic, aerodynamic, hydrostatic and hydrodynamic forces for different modes of operation ranging from a stationary floating configuration on a water surface, to flight in ground effect at high speed. A propulsion system can utilize hydrogen as an energy source driving fluid-dynamic thrusters, to enable zero carbon emissions operations. A transition method is provided for a PASRACS to transition from a floating mode to a takeoff mode to a flight in ground-effect mode in an inventive optimized manner. A transport method for multimodally transporting payload is provided with PASRACS vehicles and systems, with quick turn time operations enabled by the use of payload transfer transport modules and transfer vehicles.

This invention relates to the field of hydrodynamic spatial distribution technology and discloses a method and system for assessing the spatial distribution of hydrodynamic forces on reefs caused by protective engineering projects. The method comprises: obtaining coral parameter data and protective engineering parameter data for the target reef area; performing hydrodynamic simulation based on the coral parameter data and protective engineering parameter data; determining hydrodynamic factor differences based on the hydrodynamic simulation results; and generating a composite impact index based on the hydrodynamic factor differences and classifying the impact of protective engineering projects. This solution enables high-precision simulation of the spatial distribution of hydrodynamic forces on reefs, providing a basis for precise, coordinated decision-making for engineering optimization and ecological protection.

The present invention provides a tsunami shelter that can be constructed with little time, effort, or cost of a structure, and capable of protecting human life with a high probability from occurrence of a tsunami until a predetermined time has elapsed.　The tsunami shelter includes a shelter body 2, at least an upper portion of which is sealed to secure a living space S therein, and an outer wall portion 3 surrounding the periphery of the shelter body 2 and interfering with at least mechanical effects on the shelter body 2 caused by hydrodynamic forces or drifting objects generated by a tsunami. The outer wall portion 3 is supported by the ground or the like, and the shelter body 2 and the outer wall portion 3 are formed as separate structures.

This invention belongs to the technical field of subsea pipeline structure stress and in-situ stability. It discloses a model pipeline system capable of accurately measuring the stress on subsea pipelines. The system has a symmetrical structure and includes a model pipeline body, end support structures, a two-dimensional total force sensor measurement assembly, a dynamic pressure measurement sensor, a maintenance window for the model pipeline system, fixed tie rods, and a pressure sensor mounting body. The pressure sensor mounting body is located between the two model pipeline bodies. This invention can highly integrate various sensors into the same model pipeline testing system, greatly improving experimental testing efficiency. Furthermore, this invention enables simultaneous measurement of the hydrodynamic forces and soil resistance experienced by the model pipeline, making research on the in-situ stability of subsea pipelines a practical possibility.

The present application belongs to the field of ship hydrodynamics and motion prediction, and in particular to a device and method for predicting the hydrodynamics and motion of a ship coupled with ice, which first derives a Green function that satisfies the boundary conditions of the ice layer and the free surface, as well as all other conditions except the surface condition of the ship, and through the Green function, the differential equation of the velocity potential is converted into a boundary integral equation on the surface of the ship only, which introduces an extended surface at the waterline of the ship body to eliminate the influence of irregular wave frequencies; an asymptotic solution formula of the Green function is analytically derived, thereby establishing an approximate and effective solution program for the coupled interaction of the ship / wave / ice layer, and numerically calculating the results of the added mass, damping coefficient and wave exciting force of the ship body; through the method, the interaction mechanism of the water wave / ship / ice layer under different parameter characteristics can be deeply understood, and theoretical support is provided for the hydrodynamic problems, motion prediction and rational design of polar ships.

Unlocking insights from Geo-Data, the present invention further relates to improvements in sustainability and environmental developments: together we create a safe and livable world. Described are systems and techniques for high-speed multibeam echosounder (MBES) surveying using a gondola (200a, 200b) attached to a semi-displacement or planing hull vessel. A housing (230) encloses a multi-head MBES transducer array, with a nose fairing extending from a maximum width of the housing and a tail fairing extending from a minimum width of the housing. A hydrofoil strut segment (225) has first (227-1) and second hydrofoil surfaces (227-2) orthogonal to the housing (230), and includes at a first distal end a coupling (232) for flush attachment to an upper surface of the housing (230) and at a second distal end a coupler portion for attachment to the semi-displacement or planing hull vessel. The first and second hydrofoil surfaces can generate opposing hydrodynamic forces during high-speed MBES surveying by the semi-displacement or planing hull vessel.

The invention provides a hot water force multi-field monitoring analysis method and system suitable for a TEHB test system, and the method comprises a model framework building step, a steady-state initial field solving step, a hot water force coupling solving step, and a multi-field response data collection and recording step. The invention further provides a hot water force multi-field monitoring and analyzing system suitable for the TEHB test system, a three-dimensional model containing the six-direction waveguide rod and the rock sample is established, a mechanical, seepage and temperature steady-state initial field before impact loading is obtained, hot water force coupling dynamic calculation is carried out under the action of triaxial six-direction synchronous impact, and the test result is obtained. And curves and statistical indexes of key results such as stress, fracture, pore pressure, temperature and the like are automatically output. According to the invention, the impact process simulation can be realized under the hot water-force coupling loading condition, and multi-field response data can be monitored and analyzed, so that the dynamic mechanical behavior of the rock under the hot water-force coupling effect can be revealed, and a basis is provided for the scientific design of deep engineering.

Slots are provided in the end faces of the bearings in a transition region. The slots improve the balance of hydrostatic and hydrodynamic forces between the bearing and a gear mounted on a journal supported by the bearing, thus increasing the film thickness and providing greater strength at smaller clearances. The slots reduce wear on the end face resulting from the operation of the gear pump under higher pressure conditions. (Shortcut figure: Fig. 5)

The present invention is related to subsea technologies, and describes a manipulator device with diverless docking in a pipeline that has the purpose of performing maintenance and inspection operations on pipelines and equipment in shallow water depths (WD), especially in the Tidal Variation Zone (TVZ) where hydrodynamic forces are high. The device is formed by: a main structure (1), a handle (2), at least two manipulators (3), at least two grippers (4), an umbilical (5), a bend stiffener (6), a hydraulic actuator (7), at least one pole (8), a camera and pan & tilt lighting assembly (9), and at least two magnetic hangers (10). The device has the following functions: docking at the work site (a pipeline or other structure where the grippers can be secured to, when closed); moving the manipulator according to the service; and viewing, through the camera and pan & tilt lighting assembly (9), whether the operation is being performed correctly. The method for positioning and controlling the device is carried out by positioning the device at the work site by an ROV, or by a human diver, and after docking at the work site, the device can be controlled by means of an umbilical that connects the same to an ROV or be remotely controlled by the platform by means of an umbilical.

The invention discloses an underwater follow-up rotating towed body for integrated navigation. Comprising an external follow-up housing, stabilizing wings, a fixed frame, a rolling bearing and a combined navigation assembly, the outer surface of the external follow-up housing is connected with a stabilizing wing; a combined navigation assembly and a fixed frame which are coaxially arranged from inside to outside are arranged in the external follow-up housing, and the upper end and the lower end of the combined navigation assembly are rotationally connected with the fixed frame through rolling bearings respectively; the fixed frame is fixedly connected with the external follow-up housing, and the combined navigation assembly is electrically connected with the outside; when the external follow-up housing is placed underwater, the external follow-up housing freely rotates around the central shaft under the action of hydrodynamic force, and the rotating motion of the external follow-up housing is decoupled by the rolling bearing, so that the external follow-up housing and the fixed frame can rotate relative to the combined navigation assembly, and the combined navigation assembly is kept in a stable state. The structure is ingenious, the problem that the navigation precision of a traditional towed body is greatly disturbed by fluid is effectively solved, and the reliability and stability of underwater long-endurance and high-precision navigation are remarkably improved.

This invention discloses a simulation method and system for ship berthing and unberthing maneuvering considering the combined effects of wind and waves. The method establishes a body-dependent coordinate system with the ship's center of gravity as the origin, constructs three-degree-of-freedom motion equations for the ship's sway, roll, and bow roll in the horizontal plane, and couples the ship's hydrodynamic forces, propeller forces, rudder forces, bow thruster forces, wind loads, current loads, and wave drift forces into the state model. Wind loads are calculated using the wind pressure coefficient method, current loads using the current pressure coefficient method, and wave drift forces are obtained through frequency domain integration of the random wave spectrum and the drift force transfer function. Based on the aforementioned maneuvering forces and environmental forces, the state vector is solved iteratively using the fourth-order Runge-Kutta method, updating the ship's position coordinates, heading angle, and velocities in each direction in real time, and outputting the time histories of environmental forces and maneuvering forces to support berthing and unberthing maneuvering decisions. This invention features complete environmental load modeling, high numerical solution accuracy, and a modular system structure, demonstrating good engineering applicability.

The utility model provides a hydrodynamic force measuring device of a fluctuating hydrofoil, and particularly belongs to the technical field of measurement. The hydrofoil position adjusting mechanism composed of the horizontal sliding block, the locking device and the horizontal sliding beam is used for controlling the position of the fluctuation hydrofoil assembly in the directions of three coordinate axes, the influence of the immersion depth on the propelling mechanism of the bionic fish can be further explored conveniently, the test cost is low, the efficiency is high, and a large amount of test data can be obtained in a short time. The device comprises a water tank container and a horizontal sliding beam, and further comprises a six-component force sensor and a fluctuation hydrofoil assembly. An elbow guide plate is fixedly arranged at the corner of the inner side wall of the water tank container, a honeycomb rectifier is fixedly installed in the water tank container, horizontal guide rails are fixedly installed on the upper edges of the two sides of the water tank container, horizontal sliding beams are arranged on the horizontal guide rails, vertical lifting rods are connected to the horizontal sliding beams, and six-component force sensors are installed on the vertical lifting rods. And one end of the vertical lifting rod is connected with a fluctuating hydrofoil assembly.

This application provides a jet modulation suppression method and system for chatter suppression in bearing roller grinding. The method includes: performing time-frequency analysis on the vibration acceleration data during the pre-processed bearing roller machining process to obtain a target suppression frequency set; obtaining an adaptive modulation signal sequence based on the frequencies and corresponding phases in the target suppression frequency set; obtaining a desired valve opening area sequence for controlling the jet switching valve based on the principle of canceling out the target damping force and the jet impact force; compensating for the inertial delay of the driving voltage at the previous time stamp based on the desired valve opening area sequence to obtain a compensated driving voltage; obtaining a jet duty cycle sequence based on the compensated driving voltage sequence, and then obtaining the control signal for controlling the jet switching valve. This application achieves precise cancellation of the hydrodynamic forces opposite to the chatter by real-time sensing of chatter characteristics and utilizing active pulse jets, improving machining stability and consistency, and is suitable for the mass precision manufacturing of high-performance bearing rollers.

The present invention relates to a downhole cable tool for performing operations in a metal well tubular structure downhole of a well containing wellbore fluid, the downhole cable tool having an axial extension direction and a front face facing away from the top of the well, and the downhole cable tool comprising: a cable connection unit for connecting to a cable; an electric motor powered by the cable for rotating the rotating shaft at a first rotational speed; an operating tool component for performing an operation by electric and / or hydraulic fluid; and an epicyclic gear arranged between the electric motor and the operating tool component, the epicyclic gear being driven by a rotational shaft of the electric motor for rotating the operating tool component at a second rotational speed through the output rotational shaft, the epicyclic gear having a channel through which an electrical and / or fluid line extends, to provide electrical and / or hydrodynamic forces for operating the operating tool component. The invention also relates to a downhole system comprising a downhole cable tool and a drive unit, such as a downhole tractor, for advancing the downhole system in a well.

Slots are provided in end faces of bearings in a transition region thereof. The slots improve the balance of hydrostatic and hydrodynamic forces between the bearing and a gear provided on a journal supported by the bearing, thereby improving film thickness and providing increased force at smaller clearances. The slots reduce wear occurring on the end face resulting from operation of the gear pump under higher pressure conditions.