Symmetry often occurs in large-scale flexible structures,the symmetric systems can be decoupledexactly into several independent smaller scale subsystems according to the group representation theory.

There are numerous actuators and sensors in large flexible space structure (LFSS).

By right of xPC,Hardware-in-the-Loop Simulation(HILS)system of certain large flexible multi-body structure satellite was designed.

In the fluid environment,the vibration of the structure can induce the ambient fluid to move along with it,which successively produce so-called added mass,and this is also an important part of the model of coupled wind-induced vibration theory for the long-span flexible structures in structural engineering.

Independent modal H_∞ control of vibration flexible structures;

Planning for urban green space system and establishing a calamity-prevention city with flexible structure;

Robust active vibration control of the flexible structure via μ synthesis;

The problem of improving structural flexibility of heat exchanger networks is to retrofit the configuration of a heat exchanger network whose flexibility does not meet the requirement and enhance its flexibility, so as to decrease its energy consumption caused by uncertain parameters.

According to the structural characteristics of parallel machine lines in Flexible Manufacturing System (FMS),this paper developed the definition and measure of structural flexibility with consideration of different ca- pacity of the machines.