Environments during launch and in space
Spacecraft that lift off on a launch vehicle, e.g., satellites, experience various kinds of loads. Firstly, they are exposed to vibration environments during launch due to the loud sound generated by a launch vehicle or the combustion of its engine. Then, the following separation of a spacecraft from a launch vehicle or the deployments of an antenna, paddle, etc., also cause great shocks. Moreover, in outer space where spacecraft are suppose to execute their missions, they are subjected to ultra-high vacuum, high temperature generated by solar radiation, cryogenic environment close to absolute zero on the other side of the vehicle, and other severe environmental conditions not found on earth. Once launched into space, a spacecraft and a launch vehicle cannot be readily accessed nor fixed. Therefore, it is important to ensure before lift-off that they will function properly and bring out their capabilities in such severe environments. That is why we simulate the environments in various ground tests using those facilities.
