4. STRUCTURE DESIGN
4.1. Wing structure
Wing structure
The wing on the plane is a part that the highest load take. The large bending moments especially act on the point near the root of wing. Also, we should consider the number of spar, rib, position, skin thickness and taper ratio.
I Beam shape
4.2. I Beam
Beam theory shows that the I-shaped section is a very efficient form f
ratio, : clearance volume, : displacement volume)
압축비는 내연기관의 열효율을 결정하는 중요한 parameter이다. 이상적인 Otto cycle의 열효율의 식은 다음과 같이 표현된다.
( : thermal efficiency, : compression ratio, : specific heat ratio)
이때 비열비 는 공기에 대해 1.4 정도로 일정하다.
ration Model
foolish model 이후 순수한 ethanol을 얻기 위한 separtion공정이다.
① D1 unit (distillation)
원할한 azeotropic distillation을 하기 위하여 별도의 Distillation 유닛을 달아 separartion model로 들어오는 feed stream을 water와 ethanol의 azeotrope point 조성으로 맞추어 주었다.
그림 53. D1 unit
1-AZ stream
mole fraction
situation. In addition to that, the president of one carrier in the States said that a cash flow from its operations won’t meet liquidity needs and that it could run out of cash before year’s end.
Furthermore, FSCs have been spoiled by the increase of fuel cost which takes a big share of their operational cost and the decrease of the number of frequent flyers or long-distance customers.