摘要:
为适应在青藏高原高海拔山区开展大比例尺低空航空物探测量工作,满足低飞行高度、高测量精度的要求,通过对比其他机型在机场条件、起飞升限、最大升限、高原机动性能,首次选择使用AS350-B3型直升机并设计制作长杆硬架防振航空磁测系统。对该机型在地面及空中试验进行了磁干扰形式、周期、幅值及衰减规律测试,发现其磁干扰主要由周期为96s幅值约为700nT的脉冲磁干扰、幅值约为300nT的方波磁干扰和周期为1s幅值约为20 nT由螺旋桨转动引起的磁干扰杂波组成,通过把磁探头适当远离飞机发动机及螺旋桨,对硬架系统加装防振部件,再加上磁测设备中的软补偿系统的磁补偿,就可能较好地克服飞机动作及振动引起的磁干扰,从而测量到高质量的磁数据,满足了在高海拔地形切割较大地区作业的要求。
Abstract:
ForthepurposeofproperutilizationofaerogeophysicalsurveymethodintheTibetanPlateau,whichischaracterizedbyhigh altitude,largescaleandlowflyingheight,theauthorsselectedasuitabletypeofhelicopter,andcarriedoutsometentativegroundand airresearchesontheselectedhelicopter'smagneticinterferencesform,frequency,amplitude,attenuationregularityand,onsuchaba-sis,designedalongfirmanti-vibrationsurveysystemsuitableforAS350-B3helicopter.Theexperimentalresultsindicatethatmagnetic interferenceinageophysicalaircraftenvironmentcomesfromseveralsources,whichinclude700nT/96spulseand300nT/ssquare wavemagneticinterferenceaswellas20nT/sfromrateofchangeofmovementofconductivesurfaceswithrotarywing.Throughlow flyingheightandhighqualitydatasurveyincentralandsouthQilianofQinghaiProvince,theauthorsprovethatAS350-B3helicopter andalongfirmanti-vibrationsurveysystemcanbeusedforalargescale,lowflyingheightaerogeophysicalsurveyintheTibetanPlat-eau.
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