In recent years, there has been increasing use of lightweight materials in aircrafts and space structures. These structures are becoming larger and more flexible. In lightweight and large structures, they are prone to excessive vibration because of its flexibility. Therefore, the vibration control of such structures becomes more important than ever before. In order to control the vibration, smart structures have attracted a considerable amount of research. A smart structure is a structure with distributed sensors and actuators that can be applied to vibration suppression, shape control, damage monitoring, impact force identification, etc. In active vibration control using a smart structure, it is important to perform a precise vibration measurement. Independent measurement of each modal displacement, that is, the construction of modal sensors can also simplify the control system. This paper proposes a measurement method of modal displacements for vibration control by optimizing the placement of strain sensors.
On the other hand, health monitoring is one of the main applications of smart structures. In the real-time health monitoring, it is important to identify the impact force acting on aircrafts and space structures. This paper examines an identification method of the impact force using modal displacements.
edited by Hiroki HAYATA