04669nas a2200385 a 4500 20260818173847.0 090514s2008 th uu|m rtt 0| a1eng d .b12054975 AIT Thesis no.OTM-08-03 Sitthipong Angkapunyadej Preliminary investigation of vortex shedding induced vibration (VIV) on minimum offshore structures Pathum Thani, Thailand : Asian Institute of Technology, 2008 114, [3] leaves : ill. Thesis ; no. OTM-08-03 A thesis proposal submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Offshore Technology and Management, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 2008 Minimum non-jacket structures are suitable for marg inal oil and gas fields with reducing cost of the whole project. Minimum non-jac ket structures, which provide less reserve strength and redundancy than conventional j acket type structures, show unsatisfactory performance to satisfy vortex sheddi ng and human performance on the topsides. The specific objectives of the study are to design suitable minimum platform structures for the marginal fields in the Gulf of T hailand and to investigate the suitability of the structures against Vortex Shedding induced V ibration (VIV). According to the definition specified in API-RP2A WSD Edition 2005, five models of the minimum non- jacket structures are applied for the study. The wa ter depth of 20-40 meters and the soil data are generic for studying the effects of the wa ter depth and the soil data to serviceability criteria and vortex shedding. The in vestigation of vortex shedding effect is only on the detection of the possibility of the occ urrence of VIV on the structures. The results are presented as frequencies in each mode. The occurrences of VIV both in-line and/or cross-flow are verified following DNV criter ia. The dynamic amplification factors are plotted to clearly show the position of occurri ng the resonance on the member. Minimum non-jacket structures are suitable for marginal oil and gas fields with reducing cost of the whole project. Minimum non-jacket structures, which provide less reserve strength and redundancy than conventional jacket type structures, show unsatisfactory performance to satisfy vortex shedding and human performance on the topsides. The specific objectives of the study are to design suitable minimum platform structures for the marginal fields in the Gulf of Thailand and to investigate the suitability of the structures against Vortex Shedding induced Vibration (VIV). According to the definition specified in API-RP2A WSD Edition 2005, five models of the minimum non»jacket structures are applied for the study. The water depth of 20-40 meters and the soil data are generic for studying the effects of the water depth and the soil data to serviceability criteria and vortex shedding. The investigation of vortex shedding effect is only on the detection of the possibility of the occurrence of VIV on the structures. The results are presented as frequencies in each mode. The occurrences of VIV both in-line and/or cross-flow are verified following DNV criteria. The dynamic amplification factors are plotted to clearly show the position of occurring the resonance on the member Offshore structures Vibration Thailand, Gulf of Widjaja, Joko Harsono, Chairperson Worsak Kanok-Nukulchai, Examination Committee Pennung Warnitchai, Examination Committee Thai Nip pon Steel Engineering and Construction Corp.,Ltd. , Scholarship donor Asian Institute of Technology. Thesis ; no. OTM-08-03 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B03585 .b12054975 mnait u 240329 0 090514 m a u 0 mnait mnarc 22 40 Barcode : 30050120685721 CREATED : 2014-05-19 RECORD # : i12800776 LPATRON : 1025976 LCHKIN : 2015-08-28 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050160006440 CREATED : 2016-03-23 RECORD # : i12905677 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 91037 91037 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.OTM-08-03 30050120685721 2026-08-18 17:38:47 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.OTM-08-03 30050160006440 2026-08-18 17:38:47 1 2026-08-18 40