Solid wood panels. Bonding quality. Test method

The water vapour diffusion resistance of timber materials were tested in a wet climate (relative humidity ranging from 100%to 65% at 20 °C) and in a dry climate (relative humidity ranging from 0% to 65% and from 0% to 35% at 20 °c) with variation by relative humidity and vapour pressure gradient. The diffusion resistance of multilayer solid wood panels lies under or within the range of the solid wood (spruce), tending even to a lower range. This can be attributed to the loosely inserted middle lamella of the used solid wood panels, which were not correctly glued by the manufacturer. The diffusion resistance of the solid wood panels increases with decreasing moisture content and decreasing panel thickness, as well as with increasing water vapour gradient from 818 to 1520 Pa. There were clear differences between the tested timber materials. The diffusion resistance of particle composites is strongly dependent on the specific gravity. Due to laminar particles OSBs(Oriented Strand Boards) have a larger diffusion resistance than chipboards. The water vapour diffusion resistance of OSBs lies within the range of plywood.

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Solid wood panels (SWP). Requirements

10.3403/02841135 ◽

2003 ◽

Keyword(s):

Solid Wood ◽

Wood Panels

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Research on Civil Aircraft Flight Test of Power Supply Quality Analysis

Journal of Physics Conference Series ◽

10.1088/1742-6596/2136/1/012016 ◽

2021 ◽

Vol 2136 (1) ◽

pp. 012016

Author(s):

Jingtao Wu ◽

Pei Wang ◽

Jin Cai ◽

Ying Liu

Keyword(s):

Power Supply ◽

Flight Test ◽

Quality Standard ◽

Test Method ◽

Quality Analysis ◽

Quality Test ◽

Test Characteristic ◽

Aircraft Flight ◽

Civil Aircraft ◽

Test Requirements

Abstract In the process of civil aircraft airworthiness, analyzing power quality is the key to verify whether the power supply system meets the requirements of the clause. This paper makes deep research on the domestic and foreign power supply quality standard files and detailed introduces the characteristics of the power supply quality standard files. Then, comparative and analysis give suggestions which tally with power supply quality test requirements. Finally, define the special power supply quality test method for the practical engineering specifically, and power supply quality test characteristic in civil aircraft flight test, to provide guidance help for the future civil aircraft models.

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