【英文标准名称】:StructuralGluedLaminatedTimberforUtilityStructures(forWoodProducts)
【原文标准名称】:公用事业建筑用建筑层压胶合板(木制品用)
【标准号】:ANSIO5.2-2006
【标准状态】:作废
【国别】:美国
【发布日期】:
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ATIS(ASCO5)
【标准类型】:()
【标准水平】:()
【中文主题词】:燃材;层压板;木制品
【英文主题词】:Firewood;Laminatedwood;Woodproducts
【摘要】:RequirementsformanufacturingandqualitycontrolofstructuralgluedlaminatedtimberofSouthernPine,CoastRegionDouglasFir,HemFirandotherspeciesofsimilartreatabilityforelectricpowerandcommunicationstructures.
【中国标准分类号】:B70
【国际标准分类号】:29_240_20;79_080
【页数】:
【正文语种】:英语


Product Code:SAE AIR1327
Title:Acoustic Effects Produced By a Reflecting Plane
Issuing Committee:A-21 Aircraft Noise Measure Noise Aviation Emission Modeling
Scope: The purposes of this AIR are to provide technical background associated with the problem of correcting measured noise spectra to the 'free field' wherein the measurements are taken in the proximity of a ground plane; to provide practical examples of correction methods; and to present some techniques for minimizing the errors associated with the measurement of noise in the presence of ground planes. The application of this AIR should assist the acoustician in understanding the spectral effects of the reflection phenomena and suggests some methods for obtaining more accurate 'free field' acoustic data; however, the AIR does not purport to provide unique, exact solutions to all measurement problems, for each measurement situation is unique in itself. Of paramount importance to the correction procedures is a good knowledge of the acoustic impedance of the ground plane and the geometry associated with the measurement setup. A method of measuring these ground plane characteristics is described in Section 4.2.2..