Wardhana, E.M., Soetardjo, M., Semin, Santoso, A. and Fitri, S.P. 2025. Optimizing Ocean Energy Harvesting: The Significance of Natural Frequency in Piezoelectric Generator Device Electrical Output. International Journal of Marine Engineering Innovation and Research. 8, 4 (Jul. 2025), 667–675. DOI:https://doi.org/10.12962/j25481479.v8i4.5090.