Course Content

3 sections • 7 lectures • 01h 30m total length

overview of common propulsion Systems This video will give you a general overview of the most common propulsion and manoeuvring systems used to day. Manoeuvring Characteristics. The traditional rudder and propeller system. Motor ship – Low speed diesel engines. Motor ship – Medium and high speed diesel engines. Turbines. Controllable pitch propeller (CPP). Ducted propellers. The conventional rudder profile. Rudder balance. Rudder designs. Other rudder designs. Operational aspects. Twin schilling rudders. Turning diagram for twin schilling rudder. Conventional single screw arrangement. Accurate and predictable turning manoeuvres. Turning with constant rate of turn. Calculation of rate of turn (ROT). Turning with fixed turn radius.	preview	20min
Practical Marine Electrical Knowledge Designed to assist sea-going personnel in their understanding of the safe operation, testing and maintenance of ships electrical equipment and services. Examines practical electrical maintenance and fault-finding procedures on board various ship types. The series is made up of 8 programs. This program highlights recent advances of electric propulsion together with high voltage operation, safety and testing. There are many system variations around. So, it's most important that you become familiar with the components of the electrical system and the layout of the main switchboard immediately you join a ship. Pay attention to the layout of the emergency switchboard. This study will pay dividends during a blackout or when troubleshooting in cause of major breakdown. Electric Propulsion & High Voltage Practice Electrical Safety Golden Rule is: Before any work is done on the electrical installation, first, isolate the circuit by removing the supply fuses or locking the circuit-breaker in the open position. So, then the circuit cannot be energized accidentally. Then, post a warning sign to alert others that the circuit is being worked down. Then prove the circuit dead with voltmeter or approved line tester.	preview	20min
Azimuth Thrushes	preview	10min

Variable Frequency Drives Variable Frequency Drives Explained - VFD basics. In this video we take a look at variable frequency drives to understand how they work in electrical engineering and power electronics. We look at where and why to use a VFD or VSD, alternating current, direct current, single phase, three phase, frequency, rectifier, DC bus, inverter, capacitor, pwm, pulse width modulation.	preview	10min
Diesel Electric imulations show that diesel electric propulsion can be the most fuel efficient solution for LNG carriers under realistic operating conditions	preview	10min
DC grid	preview	10min

	Azipod The Pod propulsion system is a modern propeller cum rudder system for rudderless ships. ABB's AZIPOD® propulsion system is one of the most famous and advanced marine electrical pod propulsion systems which enables the ship to achieve better propulsion efficiency and helps the ship reduce fuel consumption and emission. Most of the modern cruise ships are fitted with the electric motor-driven propulsion system in which the propeller is driven directly by a synchronous motor fitted inside the pod unit. This allows the propeller to rotate 360 degrees for ahead and astern control of the ship. Know more about the construction of this unique propulsion system.	preview	10min

Requirements

Marine Knowledge

Description

Diesel Electric Propulsion: Is This A Safer, More Efficient Solution For Your Vessel?

Although the idea of powering your vessel with the indirect, two-step diesel electric energy transfer system may appear to be unnecessarily complex, its many advantages can make it a compellingly attractive alternative to a conventional direct mechanical prop-shaft drive. When under way all of the electrical power required by the vessel can be supplied from the diesel electric propulsion system, eliminating the need to run a genset.

A diesel electric power system can drive multiple propellers from a single engine or use multiple engines to power one or more propeller. In a twin-engine/twin-prop system, one engine can power both props when operating within the speed limits imposed in many areas. Electrical power from the vessel’s genset can be used to propel the boat, providing a built-in backup-especially valuable for vessels with single-engine installations.

Conversely, the propulsion system can serve as a backup for the gensets. The use of electric propulsion in certain vessel types is well-known. In marine applications, nearly all the energy is produced by diesel engines. Using an electric propulsion system, where the energy transmission is electrical and the propulsion and thruster are variable speed electrically driven, fuel consumption can be reduced significantly for many vessel types with environmental benefits.

Diesel Electric Systems have been in use to propel vessels for more than 100 years. Branobel launched the first diesel-electric ship in 1903, and since that day, diesel electric propulsion systems have evolved and today they can be found in all boat sizes and applications. But how do you know when to utilize diesel electric technology for your vessel? The investment in Diesel Electric vessels have doubled in the past 4 years, while the construction of purely mechanically propelled vessels have slowed down. But what are the reasons for this growth? Some of the benefits of the Diesel Electric systems are:

Effective design: The ability to locate your generators in any part of the vessel independent of where the power will be used;

Smaller Engine Rooms: Possibility to replace a big slow speed engine with multiple smaller generators;

Reduced Noise and Vibration: No need for long drivelines;

Flexibility: Capability to share the power of one unit with multiple devices (main propeller, bow thrusters, hotel load, pumps, etc);

Redundancy: Generators can be reassigned to cover any machine downtime;

Efficiency: Depending on the application the system can provide better fuel efficiency (mainly if there are requirements for long periods of low speed/load)

Fuel consumption savings calculation: The optimum operation point of a diesel engine will typically be around a load of 85 percent of the Max continuous rating (MCR). Moreover, the efficiency level drops quickly as the load becomes lower than 50 percent of MCR. With the help of the electric system, the mechanical propulsion prime mover is replaced by diesel-electric prime movers that will automatically start and stop as load demand varies. In comparison to a conventional vessel with mechanical propulsion, this enhances the efficiency of the energy usage and reduces the fuel consumption by keeping the average loading of each running diesel engine close to its optimum load point.

However, in some vessel applications, the load variations can be large and rapid. It is impossible to make the generators switch on and off every five seconds as would be the case with DP vessels. By using super-capacitors to supply the load variations, and hence let the diesel engines provide the average load, the peak power of the power plant will be reduced, allowing the average loading of the engines to increase to a more optimal point with lower specific fuel oil consumption. The savings in fuel consumption will depend on many parameters such as actual variations in the load, the average load and the number of prime movers.

In many installations the cost of a single-engine twin-prop diesel electric power system will be no more than a conventional twin-engine direct-mechanical drive installation. Properly integrated into the design of the vessel, the diesel electric drive’s many attributes will likely make it the preferred propulsion system for vessel owners and operators now and in the future.