Material Challenges for LighterThanAir （材料挑战轻于空气的）.pdf

AIAA 5th Aviation, Technology, Integration, and Operations Conference (ATIO) AIAA 2005-7488 26-28 September 2005, Arlington, Virginia Material Challenges for Lighter-Than-Air Systems in High Altitude Applications * † Honglian Zhai and Anthony Euler. TCOM L.P. Columbia, MD 21046, USA Lighter-than-air applications at high altitudes (stratosphere) impose significant challenges for the system flexible materials. The materials must be lightweight and strong, capable of containing lifting gas, maintaining flexibility at low temperature, have excellent damage resistance, and provide a good balance between airframe weight and system safety factors. The material must also be designed to resist the harsh stratospheric environment, high ozone concentration, intense UV, and extremely low temperatures. In addition, the material must have specific thermal radiation properties, which govern the system thermal performance. This paper will discuss in detail, the challenges, material characteristics (as they apply to LTA vehicles), progress that has been made, and the work that still lies ahead. I. Introduction N recent years, there has been increased interest in high altitude, lighter-than-air (LTA) syste