机务专业英语简答题

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1、❶简述空气动力Therearefouraerodynamicforcesthatactonanairplaneinfight;thesearelift,drag,thrustandgravity。关系：Liftopposesweightandthrustopposesdrag,liftequalsweightandthrustequalsdrag概念:Gravityconstantlypullstheairplanetowardearth・Thrustisanyforceactinginthesamedirectionastheairplane'sflightpath.Liftactspe

2、rpendiculartoboththeflightpathandthewingfsspan.Dragisanyfarceactingparalleltotheflightpathbutinoppositedirection.Soforairplanestofly,thethrustmustbegreaterthanthedragandtheliftmustbegreaterthanthegravity.方向:dragisthebackwardforce;liftistheupwardforce;gravityisthedownwardfarce;thrustistheforwardfar

3、ce.❷飞机的控制面AirplaneControlSurfacesForanairplanetobecontrollable^controlsurfacesarenecessary.Thefourmaincontrolsurfacesareailerons,elevator,rudderandflaps.ActionAxisControlledbyRollLongitudinalAileronsPitchLateralElevatorsYawVerticalRudderAileronsLocatedonthetrailingedgeofthewing,towardsthewingtips,

4、theaileronscontroltheairplane'sroll.Thismovementcausesaslightdecreaseinliftonthewingtipwiththeupwardmovingaileron,whiletheoppositewingtipexperiencesaslightincreaseinlift.TherudderislocatedonthebackedgeoftheverticalstabilizerTheairrunningoverthefinnowpushesharderagainsttheleftsideoftherudder,forcin

5、gthenoseoftheairplanetoyawroundtotheleft.Theelevatorsarelocatedonthetailplane,orhorizontalstabilizer.Movingtheelevatorupwillcausetheairplanetopitchitsnoseupandclimb,whilemovingthemdownwillcausetheairplanetopitchthenosedownanddive.Flapsarelocatedonthetailingedgeofeachwing,betweenthefuselageandtheai

6、lerons,andextendoutwardanddownwardfromthewingwhenputintouse.generatemoredragwhichslowstheairplanedownmuchfasterthanjustreducingthrottlepower❸影响ATC的因素？WhatproblemcaninfluenceATC?Traffic:problemsbeginwhenairlinesschedulemorearrivalsintoanairportthancanbephysicallyhandledforwhendelayselsewherecausegr

7、oupsofaircraftthatwouldotherwisebeseparatedintimetoarrivesimultaneously.Weather:Rainoriceandsnowontherunwaycauselandingaircrafttotakelongertoslowandexit.Fogalsorequiresadecreaseinthelandingrate・Aircraftwilldeviat