Adaptronics and Smart Structures: Basics, Materials, Design, by Hartmut Janocha

By Hartmut Janocha

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Extra info for Adaptronics and Smart Structures: Basics, Materials, Design, and Applications, Second Edition

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Simulations and model scale wind tunnel tests have shown that this system can provide 80% vibration reduction, 10 dB noise reduction for a helicopter passing overhead, and substantial aerodynamic performance gains. 4 m diameter rotor demonstrated the functionality, robustness, and required authority of the active flap system. The actuator demonstrated excellent performance during bench testing and has accumulated over 60 million cycles under a spectrum of loading conditions. The flaps showed excellent authority with oscillatory thrust greater than 10% of the steady baseline thrust.

However, whereas the arm has discrete joints about which rotation occurs, the adaptronic structure may be a continuum, thereby necessitating a distributed actuation system. For example, the tip motion of a beam will not occur by rotating the beam about a joint but by inducing its deformation by means of induced strain actuators placed on the beam. A basic premise of adaptronic structures is the intelligent use of energy transduction principles. In a conventional design, a structure would be calculated to resist the worst-case scenario.

When the environment has been sufficiently sampled and you learn the dynamics of the table, your body will try to conserve as much energy as possible and tend towards no co-contraction of muscles. If, however, someone wanders in the room and creates a disturbance in your task, e. , bumps your arm or the table, then you will once again co-contract your muscles to again increase the accuracy. The classical engineering approach to this same task would be to formulate mathematical models for the table dynamics, the mechanism that draws the line, the interaction between the table surface and the paper and the paper and the pen, and any other aspect of the problem that would seem important to an engineer.

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