Abstract
Passive vibration control solutions are often limited to working reliably at one design point. Especially applied to lightweight structures, which tend to have unwanted vibration, active vibration control approaches can outperform passive solutions. To generate dynamic forces in a narrow frequency band, passive single-degree-of-freedom oscillators are frequently used as vibration absorbers and neutralizers. In order to respond to changes in system properties and/or the frequency of excitation forces, in this work, adaptive vibration compensation by a tunable piezoelectric vibration absorber is investigated. A special design containing piezoelectric stack actuators is used to cover a large tuning range for the natural frequency of the adaptive vibration absorber, while also the utilization as an active dynamic inertial mass actuator for active control concepts is possible, which can help to implement a broadband vibration control system. An analytical model is set up to derive general design rules for the system. An absorber prototype is set up and validated experimentally for both use cases of an adaptive vibration absorber and inertial mass actuator. Finally, the adaptive vibration control system is installed and tested with a basic truss structure in the laboratory, using both the possibility to adjust the properties of the absorber and active control.
Highlights
Tuned vibration absorbers (TVA) have been used since the beginning of the 20th century to reduce disturbing vibrations [1]
The adaptive vibration control system is installed and tested with a basic truss structure in the laboratory, using both the possibility to adjust the properties of the absorber and active control
A relatively wide tuning range for the absorber’s resonance frequency was gained, which is comparable to other concepts using servo motors for tuning [5]
Summary
Tuned vibration absorbers (TVA) have been used since the beginning of the 20th century to reduce disturbing vibrations [1]. The original development aimed at damping of resonant vibrations with a damped absorber system. To cancel narrowband, forced vibrations, the TVA can be tuned to the excitation frequency, as well. In this case, the device is just lightly damped and often referred to as a vibration neutralizer in the literature [2]. Several basic concepts exist to adjust the resonance by actuation. Overviews can be found in [2,3,4]; some concepts will be introduced
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