{"id":"https://openalex.org/W1641920144","doi":null,"title":"The Natural Excitation Technique (NExT) for modal parameter extraction from operating wind turbines","display_name":"The Natural Excitation Technique (NExT) for modal parameter extraction from operating wind turbines","publication_year":1993,"publication_date":"1993-02-01","ids":{"openalex":"https://openalex.org/W1641920144","mag":"1641920144"},"language":"en","primary_location":{"id":"mag:1641920144","doi":null,"is_oa":false,"landing_page_url":"https://people.duke.edu/~hpgavin/SystemID/References/James-SAND92-1666-UC-261-1993.pdf","pdf_url":null,"source":{"id":"https://openalex.org/S4306520500","display_name":"NASA STI/Recon Technical Report N","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"journal"},"license":null,"license_id":null,"version":null,"is_accepted":false,"is_published":false,"raw_source_name":"NASA STI/Recon Technical Report N","raw_type":null},"volume":null,"type":"article","is_traditional":true,"indexed_in":[],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5076290480","display_name":"George H. James","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"George H. James","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5108612204","display_name":"Thomas G. Carne","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Thomas G. Carne","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"last","author":{"id":"https://openalex.org/A5044078756","display_name":"James P. Lauffer","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"J.P. Lauffer","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]}],"institutions":[],"countries_distinct_count":0,"institutions_distinct_count":0,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":11.191,"has_fulltext":false,"cited_by_count":622,"citation_normalized_percentile":{"value":0.97635528,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":99,"max":100},"biblio":{"volume":"93","issue":null,"first_page":"28603","last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10534","display_name":"Structural Health Monitoring Techniques","score":0.8773999810218811,"subfield":{"id":"https://openalex.org/subfields/2205","display_name":"Civil and Structural Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10534","display_name":"Structural Health Monitoring Techniques","score":0.8773999810218811,"subfield":{"id":"https://openalex.org/subfields/2205","display_name":"Civil and Structural Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10680","display_name":"Wind Energy Research and Development","score":0.060100000351667404,"subfield":{"id":"https://openalex.org/subfields/2105","display_name":"Renewable Energy, Sustainability and the Environment"},"field":{"id":"https://openalex.org/fields/21","display_name":"Energy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11096","display_name":"Aeroelasticity and Vibration Control","score":0.03290000185370445,"subfield":{"id":"https://openalex.org/subfields/2202","display_name":"Aerospace Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/natural-excitation-technique","display_name":"natural excitation technique","score":0.9890000224113464},{"id":"https://openalex.org/keywords/modal-identification","display_name":"modal parameter identification","score":0.9380000233650208},{"id":"https://openalex.org/keywords/wind-turbines","display_name":"wind turbines","score":0.7390000224113464},{"id":"https://openalex.org/keywords/ambient-vibration-test","display_name":"ambient vibration testing","score":0.7910000085830688},{"id":"https://openalex.org/keywords/vertical-axis-wind-turbine","display_name":"vertical axis wind turbine","score":0.8790000081062317},{"id":"https://openalex.org/keywords/rotating-structures","display_name":"rotating structures","score":0.5770000219345093},{"id":"https://openalex.org/keywords/aeroelastic-damping","display_name":"aeroelastic damping","score":0.8299999833106995},{"id":"https://openalex.org/keywords/damping-identification","display_name":"damping identification","score":0.3700000047683716}],"concepts":[{"id":"https://openalex.org/C71139939","wikidata":"https://www.wikidata.org/wiki/Q910194","display_name":"Modal","level":2,"score":0.7737051248550415},{"id":"https://openalex.org/C117185709","wikidata":"https://www.wikidata.org/wiki/Q381448","display_name":"Aeroelasticity","level":3,"score":0.7227724194526672},{"id":"https://openalex.org/C200239387","wikidata":"https://www.wikidata.org/wiki/Q17143727","display_name":"Modal testing","level":4,"score":0.6325045228004456},{"id":"https://openalex.org/C2778449969","wikidata":"https://www.wikidata.org/wiki/Q130760","display_name":"Turbine","level":2,"score":0.5943151116371155},{"id":"https://openalex.org/C74050887","wikidata":"https://www.wikidata.org/wiki/Q848368","display_name":"Rotation (mathematics)","level":2,"score":0.5610506534576416},{"id":"https://openalex.org/C83581075","wikidata":"https://www.wikidata.org/wiki/Q1361503","display_name":"Excitation","level":2,"score":0.5315506458282471},{"id":"https://openalex.org/C104286136","wikidata":"https://www.wikidata.org/wiki/Q1416137","display_name":"Modal analysis","level":3,"score":0.48027825355529785},{"id":"https://openalex.org/C78736273","wikidata":"https://www.wikidata.org/wiki/Q946764","display_name":"Natural frequency","level":3,"score":0.4433337450027466},{"id":"https://openalex.org/C78600449","wikidata":"https://www.wikidata.org/wiki/Q43302","display_name":"Wind power","level":2,"score":0.4365803003311157},{"id":"https://openalex.org/C4725764","wikidata":"https://www.wikidata.org/wiki/Q844704","display_name":"Extraction (chemistry)","level":2,"score":0.42314374446868896},{"id":"https://openalex.org/C66938386","wikidata":"https://www.wikidata.org/wiki/Q633538","display_name":"Structural engineering","level":1,"score":0.41934627294540405},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.407431036233902},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.40593183040618896},{"id":"https://openalex.org/C24890656","wikidata":"https://www.wikidata.org/wiki/Q82811","display_name":"Acoustics","level":1,"score":0.39424562454223633},{"id":"https://openalex.org/C47446073","wikidata":"https://www.wikidata.org/wiki/Q5165890","display_name":"Control theory (sociology)","level":3,"score":0.35286617279052734},{"id":"https://openalex.org/C198394728","wikidata":"https://www.wikidata.org/wiki/Q3695508","display_name":"Vibration","level":2,"score":0.3228342533111572},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.24986079335212708},{"id":"https://openalex.org/C13393347","wikidata":"https://www.wikidata.org/wiki/Q8424","display_name":"Aerodynamics","level":2,"score":0.23310264945030212},{"id":"https://openalex.org/C78519656","wikidata":"https://www.wikidata.org/wiki/Q101333","display_name":"Mechanical engineering","level":1,"score":0.2034783959388733},{"id":"https://openalex.org/C146978453","wikidata":"https://www.wikidata.org/wiki/Q3798668","display_name":"Aerospace engineering","level":1,"score":0.2022978961467743},{"id":"https://openalex.org/C119599485","wikidata":"https://www.wikidata.org/wiki/Q43035","display_name":"Electrical engineering","level":1,"score":0.0922166109085083},{"id":"https://openalex.org/C192562407","wikidata":"https://www.wikidata.org/wiki/Q228736","display_name":"Materials science","level":0,"score":0.0737694799900055},{"id":"https://openalex.org/C43617362","wikidata":"https://www.wikidata.org/wiki/Q170050","display_name":"Chromatography","level":1,"score":0.0},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.0},{"id":"https://openalex.org/C185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","level":0,"score":0.0},{"id":"https://openalex.org/C2775924081","wikidata":"https://www.wikidata.org/wiki/Q55608371","display_name":"Control (management)","level":2,"score":0.0},{"id":"https://openalex.org/C188027245","wikidata":"https://www.wikidata.org/wiki/Q750446","display_name":"Polymer chemistry","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"mag:1641920144","doi":null,"is_oa":false,"landing_page_url":"https://people.duke.edu/~hpgavin/SystemID/References/James-SAND92-1666-UC-261-1993.pdf","pdf_url":null,"source":{"id":"https://openalex.org/S4306520500","display_name":"NASA STI/Recon Technical Report N","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"journal"},"license":null,"license_id":null,"version":null,"is_accepted":false,"is_published":false,"raw_source_name":"NASA STI/Recon Technical Report N","raw_type":null}],"best_oa_location":null,"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":12,"referenced_works":["https://openalex.org/W115054607","https://openalex.org/W841323629","https://openalex.org/W1554260278","https://openalex.org/W1666881294","https://openalex.org/W1667165204","https://openalex.org/W2001325695","https://openalex.org/W2036488048","https://openalex.org/W2047399180","https://openalex.org/W2066328396","https://openalex.org/W2151153690","https://openalex.org/W2168090960","https://openalex.org/W2994876357"],"related_works":["https://openalex.org/W3042989105","https://openalex.org/W181784701","https://openalex.org/W1580716167","https://openalex.org/W2080093137","https://openalex.org/W842682966","https://openalex.org/W2612250955","https://openalex.org/W2198663693","https://openalex.org/W2370458963","https://openalex.org/W2005260124","https://openalex.org/W1666881294"],"abstract_inverted_index":{"The":[0],"Natural":[1],"Excitation":[2],"Technique":[3],"(NExT)":[4],"is":[5,23,72,88],"a":[6,24,34,43,61,68],"method":[7],"of":[8,26,38,81,107],"modal":[9,58],"testing":[10,59],"that":[11],"allows":[12],"structures":[13],"to":[14,74],"be":[15],"tested":[16],"in":[17],"their":[18],"ambient":[19],"environments.":[20],"This":[21],"report":[22],"compilation":[25],"developments":[27],"and":[28,32],"results":[29,53,100],"since":[30,85],"1990,":[31],"contains":[33],"new":[35],"theoretical":[36],"derivation":[37],"NExT,":[39],"as":[40,42,79],"well":[41],"verification":[44],"using":[45,102,109],"analytically":[46],"generated":[47],"data.":[48],"In":[49],"addition,":[50],"we":[51,97],"compare":[52,98],"from":[54,90],"NExT":[55,71,103],"with":[56,104],"conventional":[57],"for":[60,67],"parked,":[62],"vertical-axis":[63],"wind":[64],"turbine,":[65,70],"and,":[66],"rotating":[69],"used":[73],"calculate":[75],"the":[76,82,91],"model":[77],"parameters":[78],"functions":[80],"rotation":[83],"speed,":[84],"substantial":[86],"damping":[87,108],"derived":[89],"aeroelastic":[92,110],"interactions":[93],"during":[94],"operation.":[95],"Finally,":[96],"experimental":[99],"calculated":[101],"analytical":[105],"predictions":[106],"theory.":[111]},"counts_by_year":[{"year":2025,"cited_by_count":12},{"year":2024,"cited_by_count":17},{"year":2023,"cited_by_count":11},{"year":2022,"cited_by_count":12},{"year":2021,"cited_by_count":31},{"year":2020,"cited_by_count":34},{"year":2019,"cited_by_count":35},{"year":2018,"cited_by_count":33},{"year":2017,"cited_by_count":31},{"year":2016,"cited_by_count":30},{"year":2015,"cited_by_count":38},{"year":2014,"cited_by_count":34},{"year":2013,"cited_by_count":47},{"year":2012,"cited_by_count":42}],"updated_date":"2026-11-04T10:54:05.112534","created_date":"2016-06-24T00:00:00"}