A seventh extra anchor toward the ceiling, not physically connected, is added in order to maximize doublecurvature along the surface, and therefore embedding inherent stiffness.
第七个锚朝向天花板而没有物理连接，它的增加使得沿着表面的双曲率最大化，因而嵌入了内在刚度。
2
This study investigates the mechanism of both forming process and springback of the draw formed panel with doublecurvature. The springback is related with the tension strain of the panel surface.