1.1.3. Prevent Vibration in Ships
선박에서의 주요 진동 문제는 main engine 및 프로펠러에 의해 발생된다. 프로펠러에 의한 exciting force는 surface force나 bearing force, thrust force를 발생시키며, 발생된 force들은 hull girder 진동을 일으킨다.
다른 종류의 진동으로는 wave force로 인한 whipping 및 springing이 있으며, 다음 장
torsion)등의 여러 가지 힘을 받는다. 그리고 크랭크축의 크랭크 저널 중에서 기관 중앙부에 있는 저널은 크랭크 앞쪽 또는 뒤쪽의 저널보다 큰 압력을 받게 된다.
크랭크 핀 2개에 대하여 1개의 저널을 가진 경우에 저널의 지름을 구하여 보기로 한다. 실린더의 지름 (), 저널의 지름 (), 저널의 폭 =1.3(),
VIBRATE. The boat has started to move!
Whittlesley stands bolt upright, realizing whats going on.
WHITTLESLEY
No!
Too late. He turns to run back on deck but then stops, sniffs the air.
A look of desperation fills his eyes. With one hand he pulls out THE
KNIFE, and unexpectedly puts it to HIS OWN NECK. Better to kill
himself than face what comes next. The knife touches...
A NECKLACE of TWO ARROWS
General Process of 3D printing
FDM - Fused Deposition Molding
FDM works on an "additive" principle by laying down material in layers.
The model is produced by extruding small beads of thermoplastic material to form layers as the material hardens immediately after extrusion from the nozzle.
The nozzle can be moved in both horizontal and vertical directions by a numerically controlled mechanism
3D printing
3D printing or additive manufacturing (AM) refers to any of the various processes for printing a three-dimensional object. Primarily additive processes are used, in which successive layers of material are laid down under computer control. These objects can be of almost any shape or geometry, and are produced from a 3D model or other electronic data source.
Basic principles
If the