{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:53:00Z","timestamp":1760241180904,"version":"build-2065373602"},"reference-count":23,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2019,12,20]],"date-time":"2019-12-20T00:00:00Z","timestamp":1576800000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"The Defense Acquisition Program Administration and Agency for Defense Development in Korea","award":["UD170023DD"],"award-info":[{"award-number":["UD170023DD"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this study, piezoelectric acoustic absorbers employing two receivers and one transmitter with a feedback controller were evaluated. Based on the target and resonance frequencies of the system, resonance and non-resonance models were designed and fabricated. With a lateral size less than half the wavelength, the model had stacked structures of lossy acoustic windows, polyvinylidene difluoride, and lead zirconate titanate-5A. The structures of both models were identical, except that the resonance model had steel backing material to adjust the center frequency. Both models were analyzed in the frequency and time domains, and the effectiveness of the absorbers was compared at the target and off-target frequencies. Both models were fabricated and acoustically and electrically characterized. Their reflection reduction ratios were evaluated in the quasi-continuous-wave and time-transient modes.<\/jats:p>","DOI":"10.3390\/s20010047","type":"journal-article","created":{"date-parts":[[2019,12,23]],"date-time":"2019-12-23T03:15:01Z","timestamp":1577070901000},"page":"47","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Comparison between Resonance and Non-Resonance Type Piezoelectric Acoustic Absorbers"],"prefix":"10.3390","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8340-442X","authenticated-orcid":false,"given":"Joo Young","family":"Pyun","sequence":"first","affiliation":[{"name":"Department of Convergence Mechanical Engineering, Hanyang University, Seoul 04763, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0854-0266","authenticated-orcid":false,"given":"Young Hun","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Convergence Mechanical Engineering, Hanyang University, Seoul 04763, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Soo Won","family":"Kwon","sequence":"additional","affiliation":[{"name":"Department of Convergence Mechanical Engineering, Hanyang University, Seoul 04763, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8565-7823","authenticated-orcid":false,"given":"Won Young","family":"Choi","sequence":"additional","affiliation":[{"name":"Department of Convergence Mechanical Engineering, Hanyang University, Seoul 04763, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5117-5853","authenticated-orcid":false,"given":"Kwan Kyu","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Convergence Mechanical Engineering, Hanyang University, Seoul 04763, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2019,12,20]]},"reference":[{"key":"ref_1","first-page":"12.613.1","article-title":"Energy scavenging for wireless sensor nodes with a focus on rotation to electricity conversion","volume":"2153","author":"Yildiz","year":"2007","journal-title":"ASEE Annu. 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