For pined_pined, loosed midpoint support plate, it is found that the plates bucklinginstability will happen first while the flutter instability will disappear.
发现板在两端简支、中点联结松动时，结构首先出现屈曲失稳，而不会发生颤振失稳。
2
For pined_pined, loosed midpoint support plate, it is found that the plate's bucklinginstability will happen first while the flutter instability will disappear.
发现板在两端简支、中点联结松动时，结构首先出现屈曲失稳，而不会发生颤振失稳。
3
It also can be used in solving multi-constraint optimization problem, such as constraints on stresses, strains, maximum displacements, natural frequency and bucklinginstability of structure, etc.