Abstract
The vibration control using the piezoelectric elements is an area interesting for many industrial sectors. Within this framework, we propose an improved control technique based in synchronized switch damping by energy transfer. It realizes the energy transfer using storage capacitances and switches synchronized with the structure modal coordinates or piezo-voltages. These switches produce either a voltage inversion on the piezoelements for damping or energy extraction purposes, or oscillating discharges between the piezoelements and the storage capacitances for energy transfer. This new method has an improvement in the modal damping technology SSDI-Max. Their performance is simulated with a model representative of a clamped plate with four piezoelectric elements coupled with the structural modes while taking into account realistic transfer losses. The damping effect is simulated in multi-modal with pulse or multi-sine excitation.
Highlights
Undesired mechanical vibration harms the running mechanical equipment’s
We propose an improved control technique based in synchronized switch damping by energy transfer
The network topologies developed in this paper is named SSDI strategy (SST)-Max for ‘‘synchronized switch damping by energy transfer using SSDI-Max’’
Summary
Undesired mechanical vibration harms the running mechanical equipment’s. It could lead to material fatigue, deterioration of system performance, increase the noise level. Based on the Modal-SSDI, SSDI-Max method (Cherif et al 2012, 2015, 2013) was developed to deal with a multimodal control problem and to improve the damping performance by improving the piezoelectric element voltage amplitude. The principle of this method is developed with the objective of maximizing the. Each time the chosen modal coordinate reaches an extremum, the device waits within a given limited time window for the voltage extremum or for a significant voltage increase before to trigger the switch sequence In this method, the extra voltage is gathered on the various non-controlled modes of the structure by the piezoelectric element itself. Compared to the SST developed by Wu et al (2013), simulation results and a global theoretical model are proposed demonstrating the relationship between the achievable damping improvement and the ratio of transferred energy to the structure mechanical energy
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