Final Flashcards
Shaft horsepower is converted to a rotary force (or moment) applied to the propeller. The rotary force necessary to turn the shaft
torque
fluid film hydrodynamic bearings
self-generating pressure bearings
fluid film hydrostatic bearings
sleeve bearings (journal bearings). efficient and reliable. wear when rotational speed too low and fluid film low
rolling element transmits load from moving parts to stationary
ball and roller bearings
the power required to overcome a vessel’s total resistance at a given speed, not including the power required to turn the propeller or operate any machinery (this is close to the power required to tow a vess
Effective Horse Power
the power delivered along the shaft to the propeller at a given RPM.
Shaft Horsepower
the maximum power generated by an engine at a given RPM as determined by the engine manufacturer.
Brake Horsepower
the common unit of power; i.e., the rate at which work is done. one horsepower equals 33,000
foot-pounds of work per minute
horsepower
The electrical equivalent of one horsepower = 745.7 Watts.
Electric Motor Horsepower
gas turbine components
gas turbine extracts energy from a flow of combustion gas. It has an upstream compressor coupled to a downstream turbine, and a combustion chamber in-between.
steam turbine components
boil, condenser, turbines, feed pump
The engine supports and necessary shims are fastened directly to the ship’s structure. The shims, used for positioning the engine or gear in proper alignment, are either steel or poured plastic.
Rigid Mounting
mounting of machinery is usually done for isolation of noise and vibration from the ship structure.
Resilient mounting
anti-friction bearing
roller bearings, reduce friction
