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"ABSTRAKEvaluating the effectiveness of dynamic vibration absorber (TMDs) in order to reduce vibration of equivalent SDOF system subjected to white noise random excitation is considered. This evaluation is limited to the displament response only and performed using RMS.Response Ratio, Performance and Effective Damping concepts. The Optimum Tuning and Damping of this system especially the damped one is determined using Iterative Process and formulas for these two optimum parameters also derived by using Regression Analysis. The behavior and effectiveness of this system under Simulated Earthquake also evaluated using SIMULINK Programs and in addition to this equivalent SDOF model (1st mode modelization) ,we try to see complete structural modeling for comparison. It is the MDOF model with State-Space Formulation."

"ABSTRAKAnalisa atribut merupakan suatu metode kualitatif yang bertujuan memunculkanfitur-fitur data seismik yang tidak nampak, baik secara geometrical maupunphysical. Secara geometrical atribut seismik dapat membantu interpreter dalammengidentifikasi diskontinuitas dikarenakan adanya struktur sementara physicaldapat membantu interpreter dalam mengetahui fisis dari batuan. Dalam penelitianini digunakan atribut koherensi yang merupakan atribut geometrical untuk melihatpersebaran dan kemenerusan patahan secara lateral guna mendapat interpretasipatahan yang lebih baik. Selain itu juga digunakan atribut amplitudo RMS yangberguna untuk memetakan persebaran dari reservoir sand. Dalam penelitian inipeneliti memetakan persebaran suatu lapisan batupasir E yang terletak padakelompok sihapas, Cekungan Sumatra Tengah, Indonesia serta menginterpretasistruktur-struktur patahan yang ada yang dapat menjadi suatu jebakan hidrokarbon.Dari analisa atribut ditemukan bahwa hasil ekstraksi atribut amplitudo RMSberkorelasi dengan lingkungan pengendapan kelompok sihapas dimana atributtersebut membentuk suatu pola yang mirip dengan tidal sand bar yang terdapatpada lingkungan pengendapan tide dominated delta yang berkembang pada bagiantenggara dari area penelitiaan.

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ABSTRACTAttribute analysis is a qualitative method that aims to bring the features of seismicdata that is not readily apparent, both geometrical and physical. Geometricalattribute can assist interpreter in identifying discontinuities due to structure andPhysical attribute can help in knowing the physical interpretation of rock. Thisstudy used an attribute that is an attribute of geometrical coherent to see thedistribution and continuity of the fault laterally in order to obtain a betterinterpretation of the fault. RMS amplitude attribute also used for mapping thedistribution of reservoir sand. In this study, researcher mapped the distribution of asandstone layer that lies in group E sihapas, Central Sumatra Basin, Indonesia andinterpret the fault structures that exist which can be a trap for hydrocarbons. Fromthe analysis it was found that the extraction attribute RMS amplitude correlates withsihapas group depositional environment where these attributes form a pattern thatis similar to the tidal sand bar located on tide dominated delta depositionalenvironments that thrive in the south eastern part."

"Analisis AVO dan inversi simultan merupakan metode yang berperan penting dalam mengidentifikasi litologi dan fluida reservoar. Pada penelitian ini, analisis AVO dan inversi simultan dilakukan pada lapangan X, cekungan Sumatera Selatan. Berdasarkan analisis data Uji Kandungan Lapisan, pada sumur RWN-1 di kedalaman 1165 - 1170 meter terdapat kandungan fluida hidrokarbon berupa gas pada litologi batupasir. Penelitian ini menggunakan data pre-stack super gather yang dianalisis dengan menggunakan AVO. Dari hasil analisis ini, ditemukan anomali AVO kelas IIp pada kedalaman zona target, yaitu 1165 - 1170 meter (time 778 - 782 ms), inline 1678 dan crossline 5556. Analisis AVO dilakukan pada atribut AVO, yaitu intercept yang bernilai positif, gradient yang bernilai negatif, product yang bernilai negatif, dan scaled poisson’s ratio changed yang bernilai rendah. Analisis inversi simultan dilakukan pada partial angle stack, yaitu near angle stack (0° - 10°), mid angle stack 10° - 20°), dan far angle stack (20° - 30°). Inversi simultan dilakukan untuk identifikasi reservoar batupasir menggunakan parameter impedansi S dengan range nilai (4543,48 - 5512,35 (m/s)*(gr/cc)) dan densitas dengan range nilai (2,35 - 2,56 (gr/cc)). Sedangkan parameter impedansi P dengan range nilai (8373,25 - 9047,45 (m/s)*(gr/cc)) dan VpVs ratio dengan range nilai (1,53 - 1,87 unitless) digunakan untuk identifikasi fluida reservoar.

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AVO analysis and simultaneous inversion is the important method to identify lithology and reservoir fluid. In this research, AVO analysis and simultaneous inversion were applied to the field X, South Sumatera Basin. Based on Drilled Stem Test (DST) data analysis, in the RWN-1 well at depth 1165 - 1170 meters, there is gaseous hydrocarbon content in sandstone lithology. This study used pre-stack super gather data that was analyzed by using AVO .This analysis showed AVO class IIp anomaly in the depth of target zone, 1165 - 1170 meters (time 778 - 782 ms), inline 1678 and crossline 5556. AVO analysis was carried out on AVO attributes, positive intercept, negative gradient, negative product, and low scaled poisson’s ratio changed. Simultaneous inversion analysis was performed on partial angle stack start from near angle stack (0° - 10°), mid angle stack (10° - 20°), and far angle stack (20° - 30°). Simultaneous inversion analysis was applied to identify sandstone reservoir by using S impedance parameter with range (4543,48 - 5512,35 (m/s)*(gr/cc)) and density with range (2,35 - 2,56 (gr/cc)). Furthermore, P impedance parameter with range (8373,25 -9047,45 (m/s)*(gr/cc)) and VpVs ratio with range (1,53 - 1,87 unitless) were used to identify reservoir fluid."

"Lapangan FM merupakan salah satu lapangan penghasil hidrokarbon yang terletak di Cekungan Jawa Barat Utara. Salah satu Formasi yang berpotensi sebagai penghasil hidrokarbon adalah Formasi Cibulakan berupa batupasir dan batugamping yang menjadi reservoar objektif. Untuk memprediksi penyebaran reservoar batupasir digunakan metode multi-atribut seismik. Metode multi-atribut merupakan metode untuk memprediksi reservoar. Prediksi tersebut didapat dari hubungan fisis diaplikasikan dengan properti atribut dari data seismik. Berdasarkan analisa crosplot diketahui bahwa log gamma-ray dan density merupakan parameter yang sensitif terhadap keberadaan reservoar batupasir. Metode multi-atribut digunakan dalam membuat volume pseudo gamma-ray dan density. Kombinasi antara gamma-ray dengan density dapat memisahkan dengan baik antara batupasir, batu gamping dan batu lempung. Hasil pemetaan menunjukkan reservoar batupasir terdistribusi pada daerah Tinggian. Hasil penelitian ini dapat digunakan untuk eksplorasi lebih lanjut dalam penyebaran reservoar pada Formasi Cibulakan di Lapangan FM.

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Field FM is one of the hydrocarbon-producing field located in the North West Java Basin. One of the potential formation of hydrocarbon-producing formations are sandstones and limestones Cibulakan form the reservoir objective. To predict the spread of reservoir sandstones research using multi-attribute seismic methods. Multi-attribute method is a method for predicting reservoir parameters. The predictions obtained from the physical relationship was applied to the property attribute of the seismic data.

Based on the analysis crosplot known that gamma-ray logs and density are parameters which are sensitive to the presence of reservoir sandstones. Multi-attribute method is used to predict the pseudo volume of gamma-ray and density. The combination of gamma-ray logs with density can separate well between sandstone, limestone and claystone.

Mapping results indicate reservoir sandstones in the area of distributed Tinggian. The results can be used for further exploration in the spread of the Formation reservoir in the Field Cibulakan FM."

"[ABSTRAKBeban gempa merupakan salah satu beban yang harus diperhatikan dalam perancangan jembatan. Jembatan harus dirancang sedemikian hingga dapat memiliki kinerja yang optimal. Hal ini diukur dari parameter kekuatan serta daktilitas jembatan itu. Oleh karena itu, analisa yang mendalam hingga perilaku inelastis struktur jembatan perlu dilakukan. Dengan analisa non-linear pushover, perilaku inelastis jembatan akibat beban gempa rencana dapat diprediksi. Kemudian hasil analisa tersebut dapat menjadi acuan apakah jembatan tersebut sudah optimal atau memerlukan penanganan lebih lanjut seperti perkuatan struktur. Pada studi ini jembatan yang menjadi objek penelitian adalah jembatan cable-stayed di Maluku. Berdasarkan studi yang dilakukan, jembatan ini memiliki kekuatan yang memadai namun memiliki daktilitas yang cukup rendah. Hal ini terlihat dari besarnya beban ultimit yang dapat diterima serta besarnya displacement yang terjadi tepat sebelum jembatan mengalami kegagalan.

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ABSTRACTEarthquake load is one of the load that must be considered in the design of the bridge. The bridge should be designed so that can have an optimum performance. It is measured on the parameters of the strength and ductility of the bridge. Therefore, in-depth analysis of the inelastic behaviour of the structure of the bridge needs to be done. Inelastic behaviour of the bridge due to earthquake load can be predicted with non-linear pushover analysis. Then, the results of the analysis can be a reference to whether the bridge is optimum or require further treatment such as structure retrofitting. The bridge that becomes the object of this study is a cable-stayed bridge in Maluku. Based on study conducted, this bridge has adequate strength but has low ductility level. It is evident from the ultimate load that can be received and the amount of displacement that occurs just before the bridge failed., Earthquake load is one of the load that must be considered in the design of the bridge. The bridge should be designed so that can have an optimum performance. It is measured on the parameters of the strength and ductility of the bridge. Therefore, in-depth analysis of the inelastic behaviour of the structure of the bridge needs to be done. Inelastic behaviour of the bridge due to earthquake load can be predicted with non-linear pushover analysis. Then, the results of the analysis can be a reference to whether the bridge is optimum or require further treatment such as structure retrofitting. The bridge that becomes the object of this study is a cable-stayed bridge in Maluku. Based on study conducted, this bridge has adequate strength but has low ductility level. It is evident from the ultimate load that can be received and the amount of displacement that occurs just before the bridge failed.]"