Installation and decommissioning activities of offshore structures often applied a floating crane barge for a lifting operation. The excessive movement response of lifted module affected by the motion of floating crane barge in waves can increase a large amplitude. However, the coupled motions of a floating crane barge and lifted module are not easy to predict accurately due to the dynamic movement of a lifted module and the complex coupling system. The coupled motion responses of a floating crane barge and a lifted module during lifting operation were investigated based on time domain by experimental method in this study. The model tests are carried out at Manoeuvring and Ocean Basin of Indonesian Hydrodynamic Laboratory, BRIN. The experimental conditions include the load cases of without and with a load of lifted module in crane tip, and the lifting operation was evaluated under irregular wave conditions. The experimental results show in that the phenomena of shift resonant frequency for the dynamic responses are clearly observed on the coupled motion of multibody system. The dynamic oscillations of the lifted module have a significant effect on the motion response of the floating crane barge. And the hoisting of lifted module has an obstructed effect on the rolling motion of crane barge.

The wave height parameter in ocean waves is one of the important information for a marine structure design. The present paper investigates the results of wave heights distribution from laboratory-generated for single sea state. Data of the random wave time series collected at the ocean basin are analyzed using the wave spectrum and compared with the theoretical spectrum in this study. The random wave data is varied with four sea states consisting of sea states 3, 4, 5 and 6 obtained from laboratory measurements. The parameter conditions of generated sea waves are represented by a value of significant wave height and wave peak period in the range of sea states. The individual wave heights data in each sea state are presented in the form of exceedance probability distribution and the predictions using a linear model. This study aims to estimate the wave heights distribution using the Rayleigh and Weibull distribution model. Furthermore, the accuracy of the wave heights distribution data's prediction results in each sea state has been compared and examined for both models. The applied linear models indicate similar and reasonable estimations on the observed data trends.

Penerapan floating crane barge memiliki potensi besar untuk operasi pengangkatan struktur dalam mendukung decommissioning anjungan lepas pantai pasca operasi. Respon gerak floating crane barge dalam perairan bergelombang selama operasi pengangkatan struktur di laut menjadi faktor penting dalam menunjang operasional yang aman. Pada penelitian ini, respon gerak dinamis floating crane barge terhadap gelombang dilakukan dengan simulasi eksperimen di laboratorium maneuvering ocean basin. Model uji barge yang dilengkapi dengan struktur crane boom sederhana dibuat dengan perbandingan skala 1:28. Respon gerak model uji dievaluasi dengan kondisi gelombang reguler dan gelombang irreguler. Karakteristik gerak amplitudo dijasikan dalam grafik RAO yang mana hasilnya menunjukkan kesesuaian antara gelombang reguler dan irreguler. Respon gerak terhadap gelombang acak mengalami peningkatan secara signifikan terjadi dari kondisi gelombang Hs = 0.50 m, Tp = 4.00 s ke kondisi gelombang Hs = 1.00 m, Tp = 5.50 s untuk heave sebesar 2.8 kali, untuk roll sebesar 2.5 kali dan untuk pitch sebesar 1.5 kali.

Kapal container sebagai sarana angkutan barang berpengaruh vital terhadap laju percepatan perekonomian nasional. Kondisi perairan Indonesia yang kedalaman dan fasilitas pendukung pelabuhan bervariasi serta efisiensi operasional kapal menjadi pertimbangan dalam mendesain kapal. Penggunaan kapal sarat rendah tipe barge bermesin sebagai pengangkut container, Self Propelled Container Barge (SPCB) saat ini banyak menjadi pilihan operator kapal dalam melayani pengiriman barang dengan container. Penelitian ini menyajikan analisis hidrodinamika kapal SPCB 100 TEUs dengan metode pengujian model meliputi seakeeping, turning dan zig-zag manuvering serta resistance test. Dari hasil uji seakeeping diketahui bahwa respon gerak kapal pada kondisi gelombang sea-state 4 masih dalam batas toleransi dengan memperhatikan kombinasi kecepatan dan arah heading kapal. Kinerja  manuvering turning dan zig-zag kapal dalam batas aman yang ditetapkan IMO. Dari hasil uji resistance didapatkan kecepatan maksimal yang optimum kapal adalah 12 knot. Selain besaran terukur, uji hidrodinamika dengan model memberikan gambaran fenomena saat kapal beroperasi di laut, sehingga menjadi informasi yang penting dalam desain dan operasional kapal.