【英文标准名称】:Semiconductordevices-Mechanicalandclimatictestmethods-Part32:Flammabilityofplastic-encapsulateddevices(externallyinduced)(IEC60749-32:2002+Cor.:2003+A1:2010);GermanversionEN60749-32:2003+Cor.:2003+A1:2010
【原文标准名称】:半导体器件.机械和气候试验方法.第32部分:塑料封装器件的易燃性(内部引起的)(IEC60749-32-2002+Cor.-2003+A1-2010);德文版本EN60749-32-2003+Cor.-2003+A1-2010
【标准号】:EN60749-32-2010
【标准状态】:现行
【国别】:
【发布日期】:2011-01
【实施或试行日期】:2011-01-01
【发布单位】:欧洲标准学会(EN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:温度变化;气候试验;元部件;组件;电气工程;电学测量;电子工程;电子设备及元件;环境试验;环境测试;环境试验;易燃性;热学;;集成电路;机械测试;机械试验;塑料;耐力;半导体器件;半导体;试验;测试;痕量元素分析;外观检查(试验);外观检查(测试)
【英文主题词】:Changesoftemperature;Climatictests;Components;Electricalengineering;Electricalmeasurement;Electronicengineering;Electronicequipmentandcomponents;Environmentaltesting;Environmentaltests;Flammability;Heat;Inflammability;Integratedcircuits;Mechanicaltesting;Plastics;Resistance;Semiconductordevices;Semiconductors;Testing;Visualinspection(testing)
【摘要】:
【中国标准分类号】:L40
【国际标准分类号】:31_080_01
【页数】:8P;A4
【正文语种】:英语


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.