Yang Liwei
Special attention has been paid to solving vibration problems that were encountered 120 seconds into the Shenzhou 5 mission. These vibrations were described by Shenzhou 5 astronaut Yang Liwei as hard to endure. Corrective measures were implemented for the Shenzhou 6 mission, but since then more improvements have been added to the carrier rocket, to the pipes of the second stage, and to more than thirty other parts of the spacecraft..