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96 s幅值约为700 nT的脉冲磁干扰、幅值约为300 nT的方波磁干扰和周期为1 s幅值约为20nT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。
For the purpose of proper utilization of aero geophysical survey method in the Tibetan Plateau, which is characterized by high altitude, large scale and low flying height, the authors selected a suitable type of helicopter, and carried out some tentative ground and air researches on the selected helieopter~ magnetic interferences foim, frequency, amplitude, attenuation regularity and, on such a ba- sis, designed a long finn anti-vibration survey system suitable for AS350-B3 helicopter. The experimental results indicate that magnetic interference in a geophysical aircraft environment comes from several sources, which include 700 nT/96 s pulse and 300 nT/s square wave magnetic interference as well as 20 nT/s from rate of change of movement of conductive surfaces with rotary wing. Through low flying height and high quality data survey in central and south Qilian of Qinghai Province, the authors prove that AS350-B3 helicopter and a long finn anti-vibration survey system can be used for a large scale, low flying height aero geophysical survey in the Tibetan Plat-
出处
《物探与化探》
CAS
CSCD
2013年第4期640-644,共5页
Geophysical and Geochemical Exploration
