{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T14:37:45Z","timestamp":1784212665799,"version":"3.55.0"},"reference-count":48,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2022,7,30]],"date-time":"2022-07-30T00:00:00Z","timestamp":1659139200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001348","name":"Agency for Science, Technology and Research (A*STAR), Singapore","doi-asserted-by":"publisher","award":["A20F5a0043"],"award-info":[{"award-number":["A20F5a0043"]}],"id":[{"id":"10.13039\/501100001348","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>While the active ultrasonic method is an attractive structural health monitoring (SHM) technology, many practical issues such as weight of transducers and cables, energy consumption, reliability and cost of implementation are restraining its application. To overcome these challenges, an active ultrasonic SHM technology enabled by a direct-write transducer (DWT) array and edge computing process is proposed in this work. The operation feasibility of the monitoring function is demonstrated with Lamb wave excited and detected by a linear DWT array fabricated in situ from piezoelectric P(VDF-TrFE) polymer coating on an aluminum alloy plate with a simulated defect. The DWT array features lightweight, small profile, high conformability, and implementation scalability, whilst the edge-computing circuit dedicatedly designed for the active ultrasonic SHM is able to perform signal processing at the sensor nodes before wirelessly transmitting the data to a remote host device. The successful implementation of edge-computing processes is able to greatly decrease the amount of data to be transferred by 331 times and decrease the total energy consumption for the wireless module by 224 times. The results and analyses show that the combination of the piezoelectric DWT and edge-computing process provides a promising technical solution for realizing practical wireless active ultrasonic SHM system.<\/jats:p>","DOI":"10.3390\/s22155724","type":"journal-article","created":{"date-parts":[[2022,8,1]],"date-time":"2022-08-01T23:49:27Z","timestamp":1659397767000},"page":"5724","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Active Ultrasonic Structural Health Monitoring Enabled by Piezoelectric Direct-Write Transducers and Edge Computing Process"],"prefix":"10.3390","volume":"22","author":[{"given":"Voon-Kean","family":"Wong","sequence":"first","affiliation":[{"name":"Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarbudeen Mohamed","family":"Rabeek","sequence":"additional","affiliation":[{"name":"Institute of Microelectronics (IME), Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Szu Cheng","family":"Lai","sequence":"additional","affiliation":[{"name":"Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5490-8669","authenticated-orcid":false,"given":"Marilyne","family":"Philibert","sequence":"additional","affiliation":[{"name":"Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6046-469X","authenticated-orcid":false,"given":"David Boon Kiang","family":"Lim","sequence":"additional","affiliation":[{"name":"Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuting","family":"Chen","sequence":"additional","affiliation":[{"name":"Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3948-1687","authenticated-orcid":false,"given":"Muthusamy Kumarasamy","family":"Raja","sequence":"additional","affiliation":[{"name":"Institute of Microelectronics (IME), Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5875-4815","authenticated-orcid":false,"given":"Kui","family":"Yao","sequence":"additional","affiliation":[{"name":"Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,7,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Kot, P., Muradov, M., Gkantou, M., Kamaris, G.S., Hashim, K., and Yeboah, D. (2021). Recent advancements in non-destructive testing techniques for structural health monitoring. Appl. Sci., 11.","DOI":"10.3390\/app11062750"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"012110","DOI":"10.1088\/1742-6596\/2037\/1\/012110","article-title":"Research on intelligent structural health monitoring system","volume":"2037","author":"Li","year":"2021","journal-title":"J. Phys. Conf. Ser."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1534","DOI":"10.1016\/j.matpr.2020.09.318","article-title":"Review on structural health monitoring for restoration of heritage buildings","volume":"43","author":"Gopinath","year":"2021","journal-title":"Mater. Today Proc."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"104168","DOI":"10.1016\/j.autcon.2022.104168","article-title":"Integrated structural health monitoring in bridge engineering","volume":"136","author":"He","year":"2022","journal-title":"Autom. Constr."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"108282","DOI":"10.1016\/j.apacoust.2021.108282","article-title":"Acoustic and ultrasonic techniques for defect detection and condition monitoring in water and sewerage pipes: A review","volume":"183","author":"Yu","year":"2021","journal-title":"Appl. Acoust."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"112330","DOI":"10.1016\/j.engstruct.2021.112330","article-title":"Evaluation of structural integrity of railway bridge using acceleration data and semi-supervised learning approach","volume":"239","author":"Lee","year":"2021","journal-title":"Eng. Struct."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"92","DOI":"10.1016\/j.prostr.2022.01.008","article-title":"Structural health monitoring for light aircraft","volume":"36","author":"Karuskevich","year":"2022","journal-title":"Procedia Struct. Integr."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"61","DOI":"10.33640\/2405-609X.2408","article-title":"A non-destructive electromagnetic sensing technique to determine Chloride level in maritime concrete","volume":"7","author":"Omer","year":"2021","journal-title":"Karbala Int. J. Mod. Sci."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1403","DOI":"10.1109\/COMST.2017.2691551","article-title":"Structural health monitoring using wireless sensor networks: A comprehensive survey","volume":"19","author":"Noel","year":"2017","journal-title":"IEEE Commun. Surv. Tutor."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Rabeek, S.M., Beibei, H., and Chai, K.T.C. (2019, January 10\u201313). Design of wireless IoT sensor node & platform for water pipeline leak detection. Proceedings of the 2019 IEEE Asia-Pacific Microwave Conference (APMC), Singapore.","DOI":"10.1109\/APMC46564.2019.9038809"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"020011","DOI":"10.1063\/5.0033952","article-title":"Synchronized wireless sensors for aircraft structural health monitoring","volume":"2309","author":"Fu","year":"2020","journal-title":"AIP Conf. Proc."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"103600","DOI":"10.1016\/j.csi.2021.103600","article-title":"Facilitating the monitoring and management of structural health in civil infrastructures with an edge\/fog\/cloud architecture","volume":"81","author":"Garrido","year":"2022","journal-title":"Comput. Stand. Interfaces"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"103954","DOI":"10.1016\/j.jobe.2021.103954","article-title":"Structural health monitoring of civil engineering structures by using the internet of things: A review","volume":"48","author":"Mishra","year":"2022","journal-title":"J. Build. Eng."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"619","DOI":"10.1109\/JIOT.2017.2664072","article-title":"Structural health monitoring framework based on internet of things: A survey","volume":"4","author":"Tokognon","year":"2017","journal-title":"IEEE Internet Things J."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"111252","DOI":"10.1016\/j.compstruct.2019.111252","article-title":"Using passive and active acoustic methods for impact damage assessment of composite structures","volume":"226","author":"Saeedifara","year":"2019","journal-title":"Compos. Struct."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"052029","DOI":"10.1088\/1757-899X\/263\/5\/052029","article-title":"Structural health monitoring using ultrasonic techniques","volume":"263","author":"Madhusudanan","year":"2017","journal-title":"IOP Conf. Ser. Mater. Sci. Eng."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Mei, H., Haider, M.F., Joseph, R., Migot, A., and Giurgiutiu, V. (2019). Recent advances in piezoelectric wafer active sensors for structural health monitoring applications. Sensors, 19.","DOI":"10.3390\/s19020383"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"108026","DOI":"10.1016\/j.measurement.2020.108026","article-title":"Nonlinear Lamb wave analysis for microdefect identification in mechanical structural health assessment","volume":"164","author":"Chen","year":"2020","journal-title":"Measurement"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"117495","DOI":"10.1016\/j.conbuildmat.2019.117495","article-title":"Investigation of novel embedded piezoelectric ultrasonic transducers on crack and corrosion monitoring of steel bar","volume":"235","author":"Liu","year":"2020","journal-title":"Constr. Build Mater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"e2849","DOI":"10.1002\/stc.2849","article-title":"Structural health monitoring of adhesive joints using Lamb waves: A review","volume":"29","author":"Ramalho","year":"2022","journal-title":"Struct. Control Health Monit."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"26","DOI":"10.1016\/j.ultras.2018.03.003","article-title":"Sizing of flaws using ultrasonic bulk wave testing: A review","volume":"99","author":"Felice","year":"2018","journal-title":"Ultrasonics"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"053001","DOI":"10.1088\/0964-1726\/25\/5\/053001","article-title":"Guided wave based structural health monitoring: A review","volume":"25","author":"Mitra","year":"2016","journal-title":"Smart Mater. Struct."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"100790","DOI":"10.1016\/j.paerosci.2021.100790","article-title":"Guided waves for structural health monitoring in composites: A review and implementation strategies","volume":"129","author":"Ricci","year":"2022","journal-title":"Prog. Aerosp. Sci."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Bombarda, D., Vitetta, G.M., and Ferrante, G. (2021). Rail diagnostics based on ultrasonic guided waves: An overview. Appl. Sci., 11.","DOI":"10.3390\/app11031071"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Abbas, M., and Shafiee, M. (2018). Structural health monitoring (SHM) and determination of surface defects in large metallic structures using ultrasonic guided waves. Sensors, 18.","DOI":"10.3390\/s18113958"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.matpr.2019.12.048","article-title":"Active SHM for composite pipes using piezoelectric sensors","volume":"34","author":"Carrino","year":"2021","journal-title":"Mater. Today Proc."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Dong, T., and Nam, H.K. (2018). Cost-effectiveness of structural health monitoring in fuselage maintenance of the civil aviation industry. Aerospace, 5.","DOI":"10.3390\/aerospace5030087"},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Liu, X., Xu, Y., Li, N., Wang, X., and Zhang, W. (2019). Effect of adhesive debonding on the performance of piezoelectric sensors in structural health monitoring systems. Sensors, 19.","DOI":"10.3390\/s19235070"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"265","DOI":"10.1177\/1475921714522842","article-title":"Long-term stability of guided wave structural health monitoring using distributed adhesively bonded piezoelectric transducers","volume":"13","author":"Attarian","year":"2014","journal-title":"Struct. Health Monit."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"95","DOI":"10.1109\/TUFFC.2017.2768238","article-title":"Plastic strain determination with nonlinear ultrasonic waves using in situ integrated piezoelectric ultrasonic transducers","volume":"65","author":"Guo","year":"2018","journal-title":"IEEE Trans. Ultrason. Ferroelectr. Freq. Control"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"075031","DOI":"10.1088\/1361-665X\/ab1e88","article-title":"Ultrasonic transducers from thermal sprayed lead-free piezoelectric ceramic coatings for in-situ structural monitoring for pipelines","volume":"28","author":"Guo","year":"2019","journal-title":"Smart Mater. Struct."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"2733","DOI":"10.1109\/TUFFC.2021.3073131","article-title":"Direct-write piezoelectric transducers on carbon-fiber-reinforced polymer structures for exciting and receiving guided ultrasonic waves","volume":"68","author":"Philibert","year":"2021","journal-title":"IEEE Trans. Ultrason. Ferroelectr. Freq. Control"},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Yin, J., Chen, S., Wong, V.-K., and Yao, K. (2022). Thermal sprayed lead-free piezoelectric ceramic coatings for ultrasonic structural health monitoring. IEEE Trans. Ultrason. Ferroelectr. Freq. Control, Early Access.","DOI":"10.1109\/TUFFC.2022.3176488"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"3354","DOI":"10.1109\/JSEN.2017.2694454","article-title":"Direct-write piezoelectric ultrasonic transducers for non-destructive testing of metal plates","volume":"17","author":"Shen","year":"2017","journal-title":"IEEE Sens. J."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"102131","DOI":"10.1016\/j.ndteint.2019.102131","article-title":"Direct-write piezoelectric ultrasonic transducers for pipe structural health monitoring","volume":"107","author":"Guo","year":"2019","journal-title":"NDT Int."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"015019","DOI":"10.1088\/2631-8695\/ab6b69","article-title":"Monitoring of cracks near fastener holes using direct-write ultrasonic transducers","volume":"2","author":"Chen","year":"2020","journal-title":"Eng. Res. Express"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1645","DOI":"10.1177\/14759217211040719","article-title":"Direct-write piezoelectric coating transducers in combination with discrete ceramic transducer and laser pulse excitation for ultrasonic impact damage detection on composite plates","volume":"21","author":"Philibert","year":"2022","journal-title":"Struct. Health Monit."},{"key":"ref_38","doi-asserted-by":"crossref","unstructured":"Wong, V.-K., Liu, M., Goh, W., Chen, S., Wong, Z.Z., Cui, F., and Yao, K. (2022). Structural health monitoring of fastener hole using ring-design direct-write piezoelectric ultrasonic transducer. Struct. Health Monit., Online First.","DOI":"10.1177\/14759217211073950"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"693","DOI":"10.1177\/1475921719854528","article-title":"Wireless sensor network for structural health monitoring: A contemporary review of technologies, challenges, and future direction","volume":"19","author":"Abdulkarem","year":"2019","journal-title":"Struct. Health Monit."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"551","DOI":"10.3390\/vibration4030033","article-title":"Sensor networks for structures health monitoring: Placement, implementations, and challenges\u2014A review","volume":"4","author":"Mustapha","year":"2021","journal-title":"Vibration"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"108113","DOI":"10.1016\/j.ymssp.2021.108113","article-title":"Structural health monitoring using wireless smart sensor network\u2014An overview","volume":"163","author":"Sofi","year":"2022","journal-title":"Mech. Syst. Signal Process"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1529","DOI":"10.1109\/JPROC.2016.2547946","article-title":"Ultralow power circuit design for wireless sensor nodes for structural health monitoring","volume":"104","author":"Lee","year":"2016","journal-title":"Proc. IEEE"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"280","DOI":"10.22214\/ijraset.2021.33068","article-title":"Tiny sensor node for structural health monitoring","volume":"9","author":"Suryawanshi","year":"2021","journal-title":"IJRASET"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"7712","DOI":"10.1109\/TIE.2016.2598529","article-title":"A multi-response-based wireless impact monitoring network for aircraft composite structures","volume":"63","author":"Yuan","year":"2016","journal-title":"IEEE Trans. Ind. Electron."},{"key":"ref_45","doi-asserted-by":"crossref","unstructured":"Buckley, T., Ghosh, B., and Pakrashi, V. (2021). Edge structural health monitoring (E-SHM) using low-power wireless sensing. Sensors, 21.","DOI":"10.3390\/s21206760"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"2103842","DOI":"10.1002\/advs.202103842","article-title":"Enabling distributed intelligence with ferroelectric multifunctionalities","volume":"9","author":"Yao","year":"2022","journal-title":"Adv. Sci."},{"key":"ref_47","doi-asserted-by":"crossref","unstructured":"Capineri, L., and Bulletti, A. (2021). Ultrasonic guided-waves sensors and integrated structural health monitoring systems for impact detection and localization: A review. Sensors, 21.","DOI":"10.20944\/preprints202103.0347.v2"},{"key":"ref_48","doi-asserted-by":"crossref","unstructured":"Rabeek, S.M., Raju, S., and Raja, M.K. (December, January 28). Design of RF powered ZigBee sensor node and sub 1GHz RF power transmitter for asset tracking. Proceedings of the 2021 IEEE Asia-Pacific Microwave Conference (APMC), Brisbane, Australia.","DOI":"10.1109\/APMC52720.2021.9661913"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/15\/5724\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T00:00:04Z","timestamp":1760140804000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/15\/5724"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,7,30]]},"references-count":48,"journal-issue":{"issue":"15","published-online":{"date-parts":[[2022,8]]}},"alternative-id":["s22155724"],"URL":"https:\/\/doi.org\/10.3390\/s22155724","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,7,30]]}}}