Fatih GÜNDÜZ 030060144 (12th week)

Imbalance Rotor:

An imbalance rotor is the most significant source of vibration energy and provides to forcing function for all other vibration on the support structure and foundation. Therefore, the pedestal supports flex to absorb the vibration energy sourced by the rotor, thus the rotor does not ''bounce'' in the bearing, but component attached to the pedestal supports will vibrate in a forced and in some cases a resonant manner. In this way, by measuring and analysing the vibration of the supports it is possible to detect whether the rotor is affected by unbalancing.

(Distributed Computing, Artificial Intelligence, Biomechanics, M.P. Rocha, p.1198)


Accicular Ferrite:

Some of the most exciting recent developments in wrought and welded steel technology have involved 'accicular ferrite'. Far from being organized, this microstructure is better describes as chaotic. The plates of accicular ferrite nucleate heterogeneously on small non-metalic inclusion and rediate in many different direction from theese 'point' nucleation sites.It is believed that propagating cleavage cracks are frequently deflected as they cross an accicular ferrite microstructue with its many different orientation. This gives rise to superrior machanical properties, especially toughness.
Accicular ferrite is therefore widely recognized to be a desirable microstructure.

(Steels: microstructure and properties,H.K.Dharamshi, p.155)


Biofouling:

Biofouling represents the attachment and metabolism of macroorganism or microorganisms like algae, bacteria and fungi on surfaces It plays a major role in systems, in which the surfaces are in contact with water or aqueous solutions. the hull of ship, heat exchangers or water tanks are exposed to biofouling deposits. Ion exchanges resins or membranes are futher examples, where biofouling poses severe problems. Methods of mechanical, physical, and chemical nature are used for controlling or preventing biofouling. the most common method is chemical one namely chorolination which is applied periodically or continiously.

(Fouling science and technology, L.F. Melo, p.233)