{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,20]],"date-time":"2026-03-20T14:55:18Z","timestamp":1774018518857,"version":"3.50.1"},"reference-count":46,"publisher":"MDPI AG","issue":"14","license":[{"start":{"date-parts":[[2024,7,13]],"date-time":"2024-07-13T00:00:00Z","timestamp":1720828800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Converting otherwise wasted kinetic energy present in the environment into usable electrical energy to power wireless sensor nodes, is a green strategy to avoid the use of batteries and wires. Most of the energy harvesters presented in the literature are based on the exploitation of a one-degree-of-freedom arrangement, consisting of a tuned spring-mass system oscillating in the main direction of the exciting vibration source. However, if the direction of excitation changes, the efficiency of the harvester decreases. This paper thus proposes the idea of a curved cantilever beam with a two-degree-of-freedom arrangement, where the two bending natural frequencies of the mechanical resonator are designed to be equal. This is thought to lead to a configuration design that can be used in practical circumstances where excitation varies its direction in the plane. This, in turn, may possibly lead to a more effective energy-harvesting solution to power nodes in a wireless sensor network.<\/jats:p>","DOI":"10.3390\/s24144531","type":"journal-article","created":{"date-parts":[[2024,7,15]],"date-time":"2024-07-15T14:15:49Z","timestamp":1721052949000},"page":"4531","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Design of a Two-Degree-of-Freedom Mechanical Oscillator for Multidirectional Vibration Energy Harvesting to Power Wireless Sensor Nodes"],"prefix":"10.3390","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-2693-8899","authenticated-orcid":false,"given":"Hossein","family":"Shabanalinezhad","sequence":"first","affiliation":[{"name":"Department of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende, Italy"},{"name":"Department of Science, Technology and Society, University School for Advanced Studies Pavia, 27100 Pavia, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1910-7575","authenticated-orcid":false,"given":"Cesare","family":"Svelto","sequence":"additional","affiliation":[{"name":"Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, 20133 Milano, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6514-9672","authenticated-orcid":false,"given":"Piero","family":"Malcovati","sequence":"additional","affiliation":[{"name":"Dipartimento di Ingegneria Industriale e dell\u2019Informazione, Universit\u00e0 degli Studi di Pavia, 27100 Pavia, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6390-8073","authenticated-orcid":false,"given":"Gianluca","family":"Gatti","sequence":"additional","affiliation":[{"name":"Department of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2024,7,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"67","DOI":"10.12989\/sss.2017.19.1.067","article-title":"On the modeling methods of small-scale piezoelectric wind energy harvesting","volume":"19","author":"Zhao","year":"2017","journal-title":"Smart Struct. 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