Experimental modal analysis of British rock lighthouses
dc.contributor.author | Brownjohn, JMW | |
dc.contributor.author | Raby, Alison | |
dc.contributor.author | Bassitt, J | |
dc.contributor.author | Antonini, Alessandro | |
dc.contributor.author | Hudson, E | |
dc.contributor.author | Dobson, P | |
dc.date.accessioned | 2018-08-31T13:35:09Z | |
dc.date.available | 2018-08-31T13:35:09Z | |
dc.date.issued | 2018-11 | |
dc.identifier.issn | 0951-8339 | |
dc.identifier.issn | 1873-4170 | |
dc.identifier.uri | http://hdl.handle.net/10026.1/12213 | |
dc.description | No embargo required. | |
dc.description.abstract |
© 2018 The Authors Iconic lighthouses constructed on offshore reefs around the British Isles in the 19th century continue to play a crucial role in safe navigation, but the longevity of these historical structures is threatened by extreme weather. A program of experimental dynamic investigations has been carried out to support characterisation of extreme impulsive breaking wave loads on these structures, using monitored response data. This paper describes the procedures and outcomes of this program, which included modal tests of a collection of six of these lighthouses between June 2016 and October 2017. Five of the six lighthouses tested (Les Hanois, Wolf Rock, Longships, Bishop Rock and Eddystone) feature a 20th century metal helideck atop a 19th century masonry tower, with a Scottish lighthouse (Dubh Artach) being the exception that provides baseline behaviour of a relatively simple tower. All the masonry towers are imperfectly axisymmetric to some degree and all present logistical challenges for experimental work as they can only be accessed by helicopter flights subject to severe weather and time constraints. Against such challenges it was possible to identify key modal parameters, and to highlight some interesting effects due to symmetry and helideck retrofit. Notable findings were that most important modes have frequencies ranging between 4 Hz and 7 Hz and modal masses as low as ∼200 t. The rarely investigated effect of imperfect axisymmetry on forced vibration testing is studied, along with the introduction of additional modes due to retrofitted helideck. The implications of these effects on experimental modal analysis from forced vibration test data is illustrated. Finally, accelerations recorded on Wolf Rock Lighthouse during the 2017–2018 winter storm season show the modal test data can be used to infer breaking wave modal impulses up to 8 kNs. | |
dc.format.extent | 1-22 | |
dc.language | en | |
dc.language.iso | en | |
dc.publisher | Elsevier | |
dc.subject | Lighthouse condition assessment system | |
dc.subject | Identification | |
dc.subject | Forced vibration | |
dc.subject | Operational modal analysis | |
dc.title | Experimental modal analysis of British rock lighthouses | |
dc.type | journal-article | |
dc.type | Journal Article | |
plymouth.author-url | https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000446151500001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=11bb513d99f797142bcfeffcc58ea008 | |
plymouth.volume | 62 | |
plymouth.publication-status | Published | |
plymouth.journal | Marine Structures | |
dc.identifier.doi | 10.1016/j.marstruc.2018.07.001 | |
plymouth.organisational-group | /Plymouth | |
plymouth.organisational-group | /Plymouth/Admin Group - REF | |
plymouth.organisational-group | /Plymouth/Admin Group - REF/REF Admin Group - FoSE | |
plymouth.organisational-group | /Plymouth/Faculty of Science and Engineering | |
plymouth.organisational-group | /Plymouth/Faculty of Science and Engineering/School of Engineering, Computing and Mathematics | |
plymouth.organisational-group | /Plymouth/REF 2021 Researchers by UoA | |
plymouth.organisational-group | /Plymouth/REF 2021 Researchers by UoA/UoA12 Engineering | |
plymouth.organisational-group | /Plymouth/Users by role | |
plymouth.organisational-group | /Plymouth/Users by role/Academics | |
plymouth.organisational-group | /Plymouth/Users by role/Researchers in ResearchFish submission | |
dcterms.dateAccepted | 2018-07-12 | |
dc.rights.embargodate | 2019-11-23 | |
dc.identifier.eissn | 1873-4170 | |
dc.rights.embargoperiod | Not known | |
rioxxterms.funder | EPSRC | |
rioxxterms.identifier.project | STORMLAMP - STructural behaviour Of Rock Mounted Lighthouses At the Mercy of imPulsive waves | |
rioxxterms.versionofrecord | 10.1016/j.marstruc.2018.07.001 | |
rioxxterms.licenseref.uri | http://www.rioxx.net/licenses/all-rights-reserved | |
rioxxterms.licenseref.startdate | 2018-11 | |
rioxxterms.type | Journal Article/Review | |
plymouth.funder | STORMLAMP - STructural behaviour Of Rock Mounted Lighthouses At the Mercy of imPulsive waves::EPSRC |