A redundant power supply network includes an alternating voltage network and a first incoming-feed power converter with a first dc link and a second incoming-feed power converter with a second dc link. The first and second incoming-feed power converters are each connected on an alternating voltage side with the alternating voltage network. A first power source is connected to the first dc link and a second power source is connected to the second dc link. A mains switch is arranged between the first incoming-feed power converter and the alternating voltage network, and a dc link switch connects the first and second dc links. A connection to a terminal for an external network is arranged between the first incoming-feed power converter and the mains switch.

A drive system mounted to the hull of a buoyant vessel, the drive system having a rectifier, a generator, an AC bus in communication with shore power or a charging system and the rectifier, a DC bus in communication with the rectifier, at least one energy storage system, an inverter, a prime mover, a load regenerating device, and a control and monitor system which has predefined specifications for at least one of: storage units of at least one energy storage system; stored therein and wherein the control and monitor system is adapted to: automatically control the DC/DC converters, relieve a current draw from one or more storage units, provide charging current, and automatically draw power and redirect energy.

A drive system mounted to the hull of a buoyant vessel, the drive system having a rectifier, a generator, an AC bus in communication with shore power or a charging system and the rectifier, a DC bus in communication with the rectifier, at least one energy storage system, an inverter, a prime mover, a load regenerating device, and a control and monitor system which has predefined specifications for at least one of: storage units of at least one energy storage system; stored therein and wherein the control and monitor system is adapted to: automatically control the DC/DC converters, relieve a current draw from one or more storage units, provide charging current, and automatically draw power and redirect energy.

The invention relates to a marine rechargeable power source system (MPS) for water vessels at least partially electrically driven comprising a rechargeable power source, a source management system and a container which may be buoyant or nonbuoyant. The MPS may further comprise power transfer interfaces, power cables, thermal management systems, power sources, payment terminals, mobility devices. The MPS may provide data transmissions, may be a swappable power source and its container may be conveniently shaped. The MPS may be provided in a cloud-based communication system, a hydrogen gas powering system, a marine fuelling system and a modular system. An offshore swapping method using the MPS is proposed which can comprise a step of transferring power between the MPS and the water vessel at least partially electrically driven while stationary or in a motion. A swapping place may comprise charging apparatuses and power sources.

Disclosed are an energy self-contained oceanic drone for AI-based marine information survey and surveillance and a method using the same. A method of monitoring, by a marine vessel system, an ocean condition may include taking in a given amount of seawater or fresh water, performing advanced water treatment on the taken-in seawater or fresh water, performing water electrolysis treatment on the water obtained through the advanced water treatment, generating electric energy using a fuel cell based on hydrogen obtained from the water through the water electrolysis treatment, and supplying the generated electric energy as electric power for the marine vessel system.

A human load of regularly measuring a pH of a position 4 meters from a discharge point during a term of a commissioning of a ship with a scrubber apparatus is reduced. Provided is an apparatus provided inside a ship having a scrubber, including a first pH measuring instrument which measures a pH value of washing water discharged from the scrubber to outboard, a second pH measuring instrument which measures a pH value of washing water supplied from outboard to the scrubber, and a calculating unit which calculates a pH value of water at a predetermined position outboard, based on a dilution ratio which shows a ratio by which the washing water discharged to outboard is diluted at the predetermined position outboard, the pH value measured by the first pH measuring instrument, and the pH value measured by the second pH measuring instrument.

A human load of regularly measuring a pH of a position 4 meters from a discharge point during a term of a commissioning of a ship with a scrubber apparatus is reduced. Provided is an apparatus provided inside a ship having a scrubber, including a first pH measuring instrument which measures a pH value of washing water discharged from the scrubber to outboard, a second pH measuring instrument which measures a pH value of washing water supplied from outboard to the scrubber, and a calculating unit which calculates a pH value of water at a predetermined position outboard, based on a dilution ratio which shows a ratio by which the washing water discharged to outboard is diluted at the predetermined position outboard, the pH value measured by the first pH measuring instrument, and the pH value measured by the second pH measuring instrument.

A gyroscopic roll stabilizer includes an enclosure, a flywheel assembly, a bearing, a motor, and a bearing cooling circuit. The enclosure is mounted to a gimbal for rotation about a gimbal axis and configured to maintain a below-ambient pressure. The flywheel assembly includes a flywheel and flywheel shaft. The bearing rotatably mounts the flywheel assembly inside the enclosure for rotation about a flywheel axis. The bearing has an inner race and an outer race. The inner race is rotationally fixed relative to the flywheel shaft, and the outer race is held rotationally fixed relative to the enclosure. The motor is operative to rotate the flywheel assembly. The bearing cooling circuit is configured to transfer heat away from the bearing by recirculating coolant along a closed fluid pathway. The gyroscopic roll stabilizer is configured to transfer heat away from the inner and/or outer race of the bearing to the coolant.

A gyroscopic roll stabilizer includes an enclosure, a flywheel assembly, a bearing, a motor, and a bearing cooling circuit. The enclosure is mounted to a gimbal for rotation about a gimbal axis and configured to maintain a below-ambient pressure. The flywheel assembly includes a flywheel and flywheel shaft. The bearing rotatably mounts the flywheel assembly inside the enclosure for rotation about a flywheel axis. The bearing has an inner race and an outer race. The inner race is rotationally fixed relative to the flywheel shaft, and the outer race is held rotationally fixed relative to the enclosure. The motor is operative to rotate the flywheel assembly. The bearing cooling circuit is configured to transfer heat away from the bearing by recirculating coolant along a closed fluid pathway. The gyroscopic roll stabilizer is configured to transfer heat away from the inner and/or outer race of the bearing to the coolant.

A navigation method for a ship which includes: a plurality of main generators that feed power to navigation equipment used in normal navigation and appliances for the living quarters provided within a ship body; and an emergency generator that feeds power to emergency equipment in case of fire or flood. The navigation method includes: an emergency power feeding step for feeding power to the emergency equipment using the emergency generator when at least one of the plurality of main generators is disabled due to fire or flood; and a return-to-port power feeding step for feeding power to return-to-port equipment, required for navigation for returning to port, using the main generators and the emergency generator after the fire or flood has subsided.