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The performance of a ring of linearly coupled, monostable nonlinearoscillators is optimized towards its goal of acting as energyharvester---through piezoelectric transduction---of mesoscopic fluctuations,which are modeled as Ornstein--Uhlenbeck noises. For a single oscillator, themaximum output voltage and overall efficiency are attained for a softpiecewise-linear potential (providing a weak attractive constant force) butthey are still fairly large for a harmonic potential. When several harmonicsprings are linearly and bidirectionally coupled to form a ring, it is foundthat counter-phase coupling can largely improve the performance while in-phasecoupling worsens it. Moreover, it turns out that few (two or three) coupledunits perform better than more.

Enhancing energy harvesting by coupling monostable oscillators