Product Code:SAE AIR1989
Title:Helicopter External Noise Estimation
Issuing Committee:A-21 Aircraft Noise Measure Noise Aviation Emission Modeling
Scope:This method estimates noise for both single and tandem main rotor helicopters except for approach where it applies to single rotor designs only. It does not apply to coaxial rotor designs. Due to lack of available data, application of the method has not been evaluated for application to tiltrotor, or other VTOL configurations, when operating in the helicopter mode. Since there are substantial differences between helicopter rotors included in the data base, and tiltrotor rotors, aplication to VTOL configurations other than helicopters is not advised. Application is limited to helicopters powered by turboshaft engines and does not apply to helicopters powered by reciprocating engine, tip jets or other types of power plants. It provides noise information using basic operating and geometric information available in the open literature. To keep the method simple, it generates A-weighted sound levels, and Sound Exposure Levels precluding the necessity for spectral details. The metod prescribes estimates for typical helicopter operations; certain maneuvers may produce noise levels different from those estimated. Estimates are given for the maximum sound levels at 1.2 m (4 ft) height above the ground. For aircraft in forward flight, the estimate is given for an aircraft at an altitude of 152 m (500 ft) on a path directly over the observer. For an aircraft in hover the estimate is given for an aircraft hovering 3.3 m (10 ft) above ground level at a distance of 152 m (500 ft) to the side of the observer. No estimate is provided for Sound Exposure Level in hover since the time duration is indeterminate.【英文标准名称】:Aerospaceseries-Sealingsleevesusedinelementsofconnection-Part006:sealingsleevesforexternaldiametercable4,68mmto5,05mm-Productstandard.
【原文标准名称】:航空航天系列.连接部件用密封套.第006部分:4.68mm～5.05mm外直径电缆用密封套.产品标准
【标准号】:NFL53-151-006-2008
【标准状态】:现行
【国别】:法国
【发布日期】:2008-02-01
【实施或试行日期】:2008-02-09
【发布单位】:法国标准化协会(FR-AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:航空航天运输;航空运输;连接件;名称与符号;尺寸;紧固件;作标记;特性;密封件;管套;套筒;规范(验收);测试;使用
【英文主题词】:Aerospacetransport;Airtransport;Connections;Designations;Dimensions;Fasteners;Marking;Properties;Seals;Sleeves;Sleeves(mechanicalcomponents);Specification(approval);Testing;Use
【摘要】:
【中国标准分类号】:V21
【国际标准分类号】:49_060
【页数】:18P.;A4
【正文语种】:其他