Since fluid dynamic bearing can reduce the noise and increase the lifetime of bearing, I am thinking the possibility to apply fluid dynamic bearing in transportation system.
Different purpose use different type of bearing. Perhaps the answer is no.
What kind of fluid bearing are you looking at? Fluid dynamic bearings require high speed of the shaft. Most transport systems are used in a variety of speeds. Occasionally, they have to stop for loading/unloading. If you solve the frequent standstill situation, fluid dynamic bearings will be interesting.
So, you may need a secondary bearing to separate the parts during standstill/start-up. If you are looking at hydrostatic bearings with a dedicated pressurisation system, standstill is solved. But then, the system will require significant pressure or area to carry the loads. Thinking this through, you may end at magnetic levitation or something similar, which is rare, but not a novelty.
Bearing efficiency. This means friction, right? And this depends on the design, viscosity, loads etc. I cannot give a rough estimate based on the information.
I just read, that there is an issue about the name "fluid dynamic bearing (FDB)" as it is owned by matsushita, see link.
http://www.hardwaresecrets.com/the-truth-about-fluid-dynamic-bearing-fdb-fans/
Fluid dynamic bearings are two types,self acting(hydrodynamic) and externally pressurised(hydrostatic),both are currently used and quite efficient in majority of applications,they have to be well designed for tha load and speed.They work very well in both rotating as well as reciprocating machines,self acting bearings may require special treatment in material and lubricant to improve starting performance and life.
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