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迄今,诸如飞机发动机外壳,飞机机翼等各种结构大多是被动式的,或者说是由被动式材料构成的。这类结构,在设计过程中,人们根据一定性能要求(如强度要求,空气动力学特性要求等)选择合适的材料与结构形式。一旦设计、加工完毕,结构性能的变化往往不能很方便地得到监测与控制。这样的结构虽然能满足一定的应用要求,但有时会导致不良后果。比
Hitherto, various structures such as aircraft engine housings, aircraft wings and the like have been mostly passive, or passive, materials. Such structures, in the design process, people according to certain performance requirements (such as strength requirements, aerodynamic characteristics, etc.) to choose the appropriate material and structure. Once designed and processed, structural performance changes often can not be easily monitored and controlled. Although this structure can meet certain application requirements, but sometimes lead to adverse consequences. ratio