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Pressure Weather and climate Aerospace Turbulence

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Video

Vertical Picture-Frame Wing Jig Structure Design with an Eye to Foundation Loading
2012-03-14
The foundation of many production aircraft assembly facilities is a more dynamic and unpredictable quantity than we would sometimes care to admit. Any tooling structures constructed on these floors, no matter how thoroughly analyzed or well understood, are at the mercy of settling and shifting concrete, which can cause very lengthy and costly periodic re-certification and adjustment procedures. It is with this in mind, then, that we explore the design possibilities for one such structure to be built in Belfast, North Ireland for the assembly of the Shorts C-Series aircraft wings. We evaluate the peak floor pressure, weight, gravity deflection, drilling deflection, and thermal deflection of four promising structures and discover that carefully designed pivot points and tension members can offer significant benefits in some areas.
Journal Article

Mathematical Model of Heat-Controlled Accumulator (HCA) for Microgravity Conditions
2020-01-20
Abstract It is reasonable to use a two-phase heat transfer loop (TPL) in a thermal control system (TCS) of spacecraft with large heat dissipation. One of the key elements of TPL is a heat-controlled accumulator (HCA). The HCA represents a volume which is filled with vapor and liquid of a single working fluid without bellows. The pressure in a HCA is controlled by the heater. The heat and mass transfer processes in the HCA can proceed with a significant nonequilibrium. This has implications on the regulation of TPL. This article presents a mathematical model of nonequilibrium heat and mass transfer processes in an HCA for microgravity conditions. The model uses the equations of mass and energy conservation separately for the vapor and liquid phases. Interfacial heat and mass transfer is also taken into account. It proposes to use the convective component k for the level of nonequilibrium evaluation.
Standard

Cloth, Carbon Fiber, Resin Impregnated
2005-06-08
HISTORICAL
AMS3897
This specification and its supplementary detail specifications cover continuous multifilament carbon tow woven into fabric and impregnated with uncured resin.
Standard

Cloth, Carbon Fiber, Resin Impregnated
2016-10-12
CURRENT
AMS3897A
This specification and its supplementary detail specifications cover continuous multifilament carbon tow woven into fabric and impregnated with uncured resin.
Standard

Paper Honeycomb 60 lb (25 kg) Paper
2016-11-10
CURRENT
AMS3720C
This specification covers paper base honeycomb material having a cell size of 0.330 or 0.440 in. (8.38 or 11.18 mm). Unless otherwise ordered, size 0.440 in. (11.18 mm) be supplied.
Standard

PAPER HONEYCOMB 60 lb (25 kg) Paper
1983-01-01
HISTORICAL
AMS3720A
This specification covers paper base honeycomb material having a cell size of 0.330 or 0.440 in. (8.38 or 11.18 mm). Unless otherwise ordered, size 0.440 in. (11.18 mm) be supplied.
Standard

PAPER HONEYCOMB 125 lb (55 kg) Paper
1994-04-01
HISTORICAL
AMS3722A
This specification covers paper base honeycomb material having a cell size of 0.440 in. (11.18 mm). Unless otherwise ordered, size 0.440 in. (11.18 mm) will be supplied.
Standard

Paper Honeycomb 125 lb (55 kg) Paper
2012-01-16
CURRENT
AMS3722B
This specification covers paper base honeycomb material having a cell size of 0.440 in. (11.18 mm). Unless otherwise ordered, size 0.440 in. (11.18 mm) will be supplied.
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