638 Active acoustic vibration control and noise isolation by using piezo-electric devices (original) (raw)
Related papers
JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 2007
This paper proposes a decentralized vibration control method for cable-network structures in space antennas, which are large and so flexible structures and show non-linear behaviors. The main advantage of this method is that it is possible to gain adaptability to changes of models, such as size or depth changes of parabolas that come from diversity of space mission and manufacturing errors. The control method is decentralized direct velocity and displacement feedback (DVDFB). Force Density Method (FDM) is used for structural analysis of cable-network structures. The index "Force Density (FD)," which shows tension condition of each cable, can be used for decision of the placement of sensors and actuators. The results show that, even though non-linear behaviors such as large displacement and slack of cables are occurred, vibration control of this structure system is possible. And then, it is also shown that the shape-changed model can obtain the control effect by this method.
JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 2008
The paper reports several steps taken to reduce vibration responses of a 50 kg-class micro-satellite structure, which is subjected to severe mechanical/vibratory environment during launching. In order to satisfy the required mechanical interface conditions, anti-vibration design of satellite structure was modified to enhance damping capacity of the structure by applying adherent aisogrid-panel, honeycomb panel, polyimid-tape-inserted connections, and damping pads. Considerable reduction of vibration responses was confirmed by vibration test of structural-thermal model.