37 results about "Neutral buoyancy" patented technology

A variable ballast propulsion shipping vessel comprising a lead segment, a cargo segment(s), and / or a tail segment hingedly attached in series. Each lead and cargo segment includes a bottom-mounted fixed ballast, a top-mounted dorsal wing with rudder, and side mounted pairs of planed wings projecting laterally (fixed or stowable). An onboard variable ballast tank is selectively air filled using a compressed air compartment and water filled / exhausted using a ballast port(s). An battery bank is charged by an battery charger (e.g., using impellers) and powers an air compressor, rudder and / or planes. A cargo bay in the cargo segment(s) is accessible through a cargo door, a hatch, and / or a capped filler neck. A shipping vessel control system creates and distributes control commands (through wired and / or wireless interfaces) to selectively operate the respective ballast tanks of the lead and cargo segments to change travel state among positive, negative, and neutral buoyancies.

A self-contained emitter assembly according to one embodiment is provided to generate and emit X-rays underwater for facilitating X-ray imaging. The self-contained emitter assembly may be operable by a user underwater and may include a float system to provide at least one of neutral buoyancy or negative buoyancy.

According to the present invention, when installing a concrete structure that is closed on the bottom and open on the top and has an inner space on a seabed, a temporary cover is installed on the concrete structure to seal the inner space, and the buoyancy of the inner space is used to bring the concrete structure to a state of negative buoyancy very close to neutral buoyancy (i.e., bring the actual weight thereof close to zero), thus obviating the need for a large crane for supporting the weight of the concrete structure when sinking the concrete structure.

FIELD: cable production.SUBSTANCE: design of combined cables intended for use in sea water and for the transmission of low-voltage signals and alternating current electrical energy. For this purpose, the cable communication channel includes a unit placed on a service vessel, a first unit of underwater equipment of a deep-sea diving device connected to a unit placed on a service vessel, a load-bearing reinforced cable-rope consisting of a set of optical and electrical communication lines, a second unit of underwater equipment connected to the first unit of underwater equipment by a neutral buoyancy cable.EFFECT: ensuring communication between the surface and underwater unit during the immersion and ascent of the underwater unit(s), as well as during the winding / reeling of communication cables onto underwater cable drums that are under the influence of significant and changing hydrostatic pressure.1 cl, 2 dwg

Intragastric device intended to be inserted into a gastric cavity to restrict its capacity. To contribute to optimal adaptation, its design is based on the principle of neutral buoyancy. The device comprises an inner core and an outer covering (2). The inner core consists of a closed chamber (1) and a first valve (4) connecting the inside of the chamber (1) to the outside, through which a pressurised fluid is introduced into the chamber (1). The outer covering (2) comprises a first cavity (5), in which the core is housed, and a second valve (7), through which a volume of fluid is introduced into the free space of the cavity not occupied by the chamber (1). This fluid in the first cavity (5) is at a different pressure to that of the fluid introduced into the chamber (1).

The invention discloses neutral buoyancy diving equipment which comprises a back support body suitable for installing at least two gas cylinders. The buoyancy fine adjustment actuator is mounted on the back support main body; the power-assisted closed-loop air supply module is mounted on the back support main body, and the control system is electrically connected with the first motor and the second motor at the same time; wherein the control system is configured to synchronously control the first motor to generate compensation buoyancy opposite to buoyancy change caused by breathing action according to the detected breathing action of the diver while controlling the second motor to supply air to the diver. The device does not passively depend on manual adjustment of a diver, but can actively, synchronously and reversely generate compensation buoyancy, so that buoyancy fluctuation caused by physiological respiration is actively counteracted in real time, precise suspension is achieved, physical exhaustion of the diver is remarkably reduced, and safer and more comfortable power-assisted breathing support is provided.

The invention relates to the technical field of material science and engineering, in particular to TiC-WC composite particles with density matching and neutral buoyancy characteristics and a preparation method of the TiC-WC composite particles. The TiC-WC-Ni / Ni-Co composite particle comprises a composite particle body composed of TiC, WC and a Ni / Ni-Co adhesive, the overall bulk density is controlled to be 7.5-8.5 g / cm < 3 >, fine-grained and coarse-grained particles are applied separately through a dual-granularity application strategy module, and the interface bonding performance is improved by means of a metallurgical wettability enhancing module. The method has the beneficial effects that according to the technical scheme, the problem of uneven distribution of hard phases in a welding pool is solved by accurately regulating and controlling the density of the composite particles, uniform suspension of the particles is ensured, meanwhile, the erosive wear resistance and mechanical impact resistance of a welding layer are improved, and the method is suitable for flux-cored wire filling and surfacing pool putting scenes; and the method has excellent performance stability and process controllability.

The invention relates to the technical field of airflow pattern testing, in particular to an airflow pattern analysis system and method based on a neutral buoyancy tracing device, the density of a tracing ball body is adjusted by using an inflation needle, so that the tracing ball body reaches a neutral buoyancy state in a target testing environment; multiple release modes are configured and executed according to test requirements, and release parameters are set; starting a tracer ball release assembly, and sending a tracer ball into the to-be-detected airflow according to a configured release mode; a video acquisition and analysis system is used for synchronously and continuously recording the motion trail of the tracing ball body under the action of airflow; the recorded image sequence is processed and analyzed through the video tracking unit, and a clear and continuous airflow track map is synthesized.

A submersible hydraulic assembly (6) for an energy storage plant (1) comprises: • at least one hydraulic machine (12); • at least one first buoyancy chamber (46, 50, 63) filled with at least one first buoyancy element (47, 51, 64); said first buoyancy chamber (46, 50, 63) is configured such that the hydraulic machine (12) exhibits practically neutral buoyancy when submerged in an ambient liquid. The invention also relates to an energy storage plant (1), a method for performing maintenance operations on said plant, and a method for its assembly and disassembly.

A variable ballast propulsion shipping vessel comprising a lead segment, a cargo segment(s), and / or a tail segment hingedly attached in series. Each lead and cargo segment includes a bottom-mounted fixed ballast, a top-mounted dorsal wing with rudder, and side-mounted pairs of planed wings projecting laterally (fixed or stowable). An onboard variable ballast tank is selectively air filled using a compressed air compartment and water filled / exhausted using a ballast port(s). An battery bank is charged by an battery charger (e.g., using impellers) and powers an air compressor, rudder and / or planes. A cargo bay in the cargo segment(s) is accessible through a cargo door, a hatch, and / or a capped filler neck. A shipping vessel control system creates and distributes control commands (through wired and / or wireless interfaces) to selectively operate the respective ballast tanks of the lead and cargo segments to change travel state among positive, negative, and neutral buoyancies.

The invention provides a handheld electric tool used in an astronaut neutral buoyancy water tank, and relates to the field of electric tools, the handheld electric tool comprises a sectional type sealing machine shell, and a sealing charging module is connected between a grip and a battery box; the upper end of the battery box is provided with a groove, and the groove accommodates and seals the charging module. The circumferential direction of the sealed charging module is fastened to the battery box through a plurality of fasteners; the circumferential direction of the bottom of the grip is fastened to the sealed charging module through a plurality of screws; static sealing rings are respectively arranged at the joints of the sealed charging module and the grip as well as the battery box; an electric connector plug is arranged on the sealing charging module, the grip is connected with an electric connector socket used in cooperation with the electric connector plug, and reliable underwater sealing can still be kept after multiple times of charging. During charging, the fastener at the joint of the grip and the sealed charging module is detached, and the battery power supply electric connector is disconnected for charging. In addition, the sealing charging module can be replaced, and the sealing reliability of the electric tool during the service life is guaranteed.

The invention discloses an amphibious salvage robot, and belongs to the technical field of underwater operation equipment. The amphibious salvage robot comprises a robot body, a land driving and underwater posture adjusting system and a salvage and underwater propelling system. The paddle wheel is driven by the fin deformation mechanism to be switched between a vertical (land driving wheel) mode and a horizontal (underwater attitude regulator) mode, and autonomous land and water transition is achieved. According to the fishing system, a propeller is used for working, a suction flow field is formed at an opened cabin door through a specially-arranged confluence channel, a target object is sucked into a fishing cabin, and efficient fishing is completed. The density of the fuselage is configured to achieve nearly neutral buoyancy, and retractable universal wheels are arranged. The problems that existing equipment is subjected to amphibious operation cutting, underwater posture adjustment is difficult, and the salvage efficiency is low are solved, and integrated continuous operation from autonomous landing, underwater cruise, precise salvage to flexible return is achieved.

The utility model relates to the field of water treatment, in particular to a telescopic structure of a deepwater aeration device, which comprises a pulse air chamber and an ascending pipe, the ascending pipe adopts a three-section structure, and the lower pipe section is connected with the pulse air chamber through a flange; the middle pipe section is sleeved with the lower pipe section, a rubber ring is fixedly arranged at the bottom of the middle pipe section, and the rubber ring is attached to the inner diameter of the lower pipe section; an annular boss is fixedly arranged below the air outlet slit of the inner-layer air chamber, and the middle pipe section slides into the inner-layer air chamber along the lower pipe section; a second watertight compartment is arranged outside the middle pipe section in a surrounding manner, so that the middle pipe section keeps neutral buoyancy; the upper pipe section is sleeved with the middle pipe section, and a third watertight compartment is arranged outside the upper pipe section in a surrounding mode, so that the third pipe section keeps positive buoyancy. The telescopic structure enables the ascending pipe to always suspend on the water surface and always suspend at a fixed position at the bottom of the water, and the stability is high; the buoyancy of each pipe section of the riser is independently controlled, the stability is high, and the sag of the whole system can be kept.

Solder alloys with enhanced properties derived from incorporation of CNTs make use of debundled, dispersed, and functionalized carbon nanotubes uniformly distributed throughout the solder alloy matrix to yield an acceptable metal-matrix nanocomposite solder alloy. Neutral buoyancy of CNTs within solder alloys may be achieved by the endohedral functionalization process. This process involves filling the CNTs with dense metals, such as low-cost, high-density bismuth, as well as functional fillers like ferromagnetic and superparamagnetic metals and alloys, or thermally conductive materials like copper and silver, which may result in an offset of the lower density carbon shell, allowing the CNTs to remain suspended in solder alloys.

Conventional SCUBA diving equipment is heavy and cumbersome, mainly due to the mass and size of the breathing gas carrier, i.e. the pressure vessel. A preferred pressure vessel for SCUBA diving can be as light as possible and neutrally buoyant at all stages of the dive. To achieve such preferred characteristics, the pressure vessel volume can be adjusted in accordance with the change in its mass. The present invention provides SCUBA systems that provides for the preferred characteristics.

The invention discloses a frogman underwater thruster carrying device and an assembling method thereof in the field of underwater thrusters, the frogman underwater thruster carrying device comprises a main body shell, an adjusting assembly and a carrying cabin, a flow guide cover and a propeller hub are mounted at the tail of the main body shell, and blades are uniformly distributed in the circumferential direction of the propeller hub; the adjusting assembly comprises a sliding guide rail, a limiting rod, a pulling rod, a sliding block, a connecting block, a rotating shaft, a hanging block and a limiting hole. The sliding guide rail comprises two sliding through grooves formed in the top and the bottom of the adjusting assembly. The carrying cabin comprises a water pump adjusting cabin, a ballast cabin, a cargo cabin and a framework. According to the frogman underwater propeller, the gravity center position of the carrying device is adjusted through the adjusting assembly, the stability of the underwater propeller during navigation is improved, the carrying device is ballasted and de-ballasted by arranging the ballast tank, the frogman underwater propeller always keeps neutral buoyancy, and high propeller efficiency is obtained.

The invention provides a modular underwater robot based on a bionic flagellum actuator, a motion control method, a buoyancy adjusting method and an assembling and testing method. The modular underwater robot comprises a spherical sealed cabin which adopts a split type sealed design and is internally embedded with a counterweight adjusting module and a neutral buoyancy control system to ensure that the gravity center coincides with the buoyancy center; the four bionic flagellum actuators are symmetrically arranged in an X shape, are driven by independent motors, adopt a diagonal synchronous steering strategy to counteract reaction torque and realize zero-radius turning and hovering, and are connected with the cabin body through quick release interfaces; the intelligent control module is integrated with a nine-axis IMU, a depth meter and a camera, the flagellum phase difference is solved in real time based on an improved D-H model and a fluid resistance matrix, and the course angle tracking error is smaller than or equal to 2 degrees. The robot has the advantages of low disturbance, high maneuverability and strong anti-flow capability, the actually measured maximum cruise speed is 0.4 m / s, the turning radius is less than or equal to 0.1 time of the body length, and the robot can be widely applied to the fields of underwater detection, pipeline inspection and ecological monitoring.

The invention discloses a high-load bionic soft body reactor and a water ecological restoration method, and relates to the technical field of water environment protection and ecological engineering. The reactor comprises a structural frame and bionic soft biological ropes fixed on the structural frame, and curtain type or array type reaction units with regular structures are formed; the surface of the bionic soft biological rope is provided with a bionic multi-stage attachment structure, the bionic soft biological rope is made of a composite material of a high-molecular polymer matrix and a functional filler prepared by a composite processing technology, the bionic soft biological rope has high specific surface area and excellent biocompatibility, the apparent density is 0.95-1.05 g / cm < 3 >, and the bionic soft biological rope can realize nearly neutral buoyancy and ordered swing in a water body; during application, the reactor units are laid in a water body, pollutants are efficiently degraded by utilizing the biological membranes attached to the surfaces of the biological ropes, and mass transfer and biological membrane renewal are continuously enhanced through ordered swinging of the biological ropes. The system has the advantages of high treatment load, fast starting, easy deployment, convenient maintenance and the like, is suitable for in-situ remediation of landscape water bodies, polluted rivers, black and odorous water bodies and the like, and has wide application prospects.

A shipping vessel is disclosed. The shipping vessel includes a vessel segment and a control system to control the vessel segment. The shipping vessel includes at least one first variable ballast tank and at least one second variable ballast tank adjacently positioned to the at least one first variable ballast tank. The at least one control system configured to receive a subroute comprising a target peak, a target trough, a target course, and a target waypoint. Based on the subroute, the at least one control system configured to selectively operate the at least one first variable ballast tank and the at least one second variable ballast tank to alter a travel state of the vessel segment among a positive buoyancy, a negative buoyancy, and a neutral buoyancy.

An electrical submersible pump (ESP) power cable includes a sheathing including a body that includes at least one conductor bore formed therethrough; and at least one power conductor threaded through the at least one conductor bore. The power cable has a density sufficient for the power cable to be at least substantially neutrally buoyant in a wellbore fluid in a wellbore.

This invention discloses a composite woven net with neutral buoyancy control capability, belonging to the field of marine engineering and fishery equipment technology. The net is formed by weaving composite netting, which includes a first fiber component and a second fiber component. The density of the first fiber component is greater than that of water, while the density of the second fiber component is less than that of water. By adjusting the volume fraction of the first and second fiber components, the equivalent density of the composite netting is made to approximate the density of the sea area or water body in use. This method achieves neutral buoyancy of the netting in water through the combination of material densities, eliminating the need for additional floats or counterweights, resulting in a simpler structure. The netting experiences more balanced forces in water, helping to maintain structural stability and reducing the risk of deformation due to gravity and buoyancy. This invention has a simple structure, strong calculability, and can improve the morphological stability of the netting while reducing hydrodynamic resistance, making it suitable for applications such as fishing nets and underwater protective structures.

A commode test system for use in Earth's gravity field at Earth's surface is provided. The commode test system includes a commode disposed at Earth's surface, a blower to generate airflow into the commode, a gas-filled bolus having a neutral buoyancy in Earth's gravity field at Earth's surface and recording devices to record movements of the gas-filled bolus in the airflow relative to the commode.

The invention relates to electrophoretic layers containing at least five different particles, and to driving methods for displaying at least five, and in some embodiments, six different colors at each pixel or sub-pixel. The electrophoretic layers may also contain uncharged neutral buoyancy particles, and the driving methods may include special shaking waveform sequences.

A commode test system for use in Earth's gravity field at Earth's surface is provided. The commode test system includes a commode disposed at Earth's surface, a blower to generate airflow into the commode, a gas-filled bolus having a neutral buoyancy in Earth's gravity field at Earth's surface and recording devices to record movements of the gas-filled bolus in the airflow relative to the commode.

To provide a marine structure that can be easily installed in the ocean. [Solution] The marine structure 100 is formed by connecting multiple neutral buoyancy units 10 in a ring shape. Adjacent neutral buoyancy units 10 each have a first end face 24a and a second end face 24b that can be connected to each other. The first end faces 24a and the second end faces 24b are formed at an angle that allows the neutral buoyancy units 10 to form a ring shape when the first end faces 24a are connected to each other or the second end faces 24b are connected to each other. The angle between the first end face 24a and the rear edge, the angle between the second end face 24b and the front edge, and the angle between the first end face 24a and the second end face 24b are all 120°. The neutral buoyancy unit 10 is formed by connecting a long upper unit 20 having a buoyant body and a long lower unit 30 serving as a stabilizer in the vertical direction.

The invention relates to an oil tank with built-in counterweight type damping sponge, and relates to the technical field of fuel oil storage equipment.The oil tank comprises an oil tank shell, an oil storage cavity is formed in the oil tank shell, a damping sponge body is arranged in the oil storage cavity, and a magnetic conductive counterweight block is fixedly connected to the interior of the damping sponge body; and a storage device, a clamping device and a pushing device are arranged in the oil storage cavity. A plurality of sponge bodies with neutral buoyancy are randomly distributed in oil liquid and are in contact, collision and friction with the oil liquid to consume energy, global oscillation suppression is achieved, meanwhile, huge gaps exist between the sponge bodies, the sponge bodies are of a porous structure, the effective oil containing volume of an oil tank is hardly occupied, and an oil way cannot be blocked or obviously blocked; and the sponge body settles along with oil consumption and liquid level decline and acts on the current oil main body part all the time, the buffering effect is not weakened due to the liquid level change, and the self-adaptive liquid level is realized.

The application discloses a gliding and swimming dual-mode AUV and a design method thereof. The AUV comprises deformable gliding wings arranged on both sides of a pressure-bearing shell, capable of being unfolded to provide lift in a gliding mode and being folded to reduce fluid resistance in a swimming mode; a buoyancy adjusting system comprising an outer oil bag, front and rear buoyancy adjusting oil tanks and a buoyancy adjusting power module, used for dynamically adjusting the buoyancy and the gravity center position of the AUV through oil transfer; and a vector propulsion module arranged at the tail of the AUV, comprising a propeller capable of being adjusted at two degrees of freedom and a guide plate matched with the propeller, used for providing direction control capability in the gliding mode. The AUV simultaneously has a tail vector propulsion device, two sets of buoyancy adjusting oil tanks distributed at front and rear positions in the pressure-bearing shell and deformable gliding wings arranged on both sides of the AUV main body, so that the AUV has two operation modes of gliding by buoyancy and swimming with neutral buoyancy, and can be flexibly switched according to operation tasks.

This invention discloses a frogman underwater propulsion vehicle and its assembly method, comprising a main body shell, an adjustment assembly, and a transport compartment. A fairing and a propeller hub are installed at the tail of the main body shell, with propeller blades evenly distributed circumferentially around the hub. The adjustment assembly includes a sliding guide rail, a limiting rod, a pulling rod, a sliding block, a connecting block, a rotating shaft, a suspension block, and a limiting hole. The sliding guide rail includes two sliding grooves at the top and bottom of the adjustment assembly. The transport compartment includes a water pump adjustment compartment, a ballast compartment, a cargo compartment, and a frame. This invention adjusts the center of gravity of the transport device through the adjustment assembly, increasing the stability of the underwater propulsion vehicle during navigation. By setting up the ballast compartment to ballast and de-ballast the transport device, the frogman underwater propulsion vehicle maintains neutral buoyancy at all times, thereby achieving higher propeller efficiency.

The invention discloses a sliding dual-mode AUV (Autonomous Underwater Vehicle) and a design method thereof. The AUV comprises deformable hang gliders which are arranged on the two sides of a pressure-bearing shell and can be unfolded in a gliding mode to provide lift force and folded in a swimming mode to reduce fluid resistance; the buoyancy adjusting system comprises an outer oil bag, a front buoyancy adjusting oil tank, a rear buoyancy adjusting oil tank and a buoyancy adjusting power module and is used for dynamically adjusting the buoyancy and the gravity center position of the AUV through oil transfer; and the vector propulsion module is arranged at the tail part of the AUV, comprises a propeller of which the angle can be adjusted at two degrees of freedom and a guide plate matched with the propeller, and is used for providing direction control capability in a gliding mode. The AUV is provided with the tail vector propelling device, the two buoyancy adjusting oil tanks distributed on the front portion and the rear portion of the interior of the pressure-bearing shell and the deformable hang gliders located on the two sides of the AUV body at the same time, so that the AUV has the two operation modes of gliding depending on buoyancy and swimming depending on neutral buoyancy, and flexible switching can be achieved according to operation tasks.

Solder alloys with enhanced properties derived from incorporation of CNTs make use of debundled, dispersed, and functionalized carbon nanotubes uniformly distributed throughout the solder alloy matrix to yield an acceptable metal-matrix nanocomposite solder alloy. Neutral buoyancy of CNTs within solder alloys may be achieved by the endohedral functionalization process. This process involves filling the CNTs with dense metals, such as low-cost, high-density bismuth, as well as functional fillers like ferromagnetic and superparamagnetic metals and alloys, or thermally conductive materials like copper and silver, which may result in an offset of the lower density carbon shell, allowing the CNTs to remain suspended in solder alloys.