No abstract

Since roro passenger ships have specific characteristics in handling cargo with the roll-on-roll-off loading and unloading system that must be equipped with a ramp door. Therefore, it is important to conduct the ultimate strength analysis by considering local loads and global loads to ensure the level of safety and reliability of the ship structure. The aim of this research is focused on the investigation of the structural response and the ultimate strength of the roro passenger ship using the non-linear finite element method. The dynamic explicit method is conducted to estimate the large displacement of the deformed structures such as the hull girders, deck girders and plates. In the structural response analysis, the results shows that maximum stress was occurred on the deck girders due to the sagging bending moment load. In the ultimate strength analysis, it is identified that hydrostatic load have reduced the ultimate strength about 33 %. Otherwise, the ultimate strength is increased about 1 %, in the sagging condition. HIGHLIGHTS The nonlinear behavior of the roro passenger ship ultimate strength due to the combined global and local load is presented On the hogging condition, the addition of local load (hydrostatic pressure) reduce the roro ship ultimate strength about 33 % compare to the pure global ultimate bending load On the sagging condition, the hydrostatic pressure have slightly increased the ultimate strength around 1 % GRAPHICAL ABSTRACT

There are still fishermen using Anco as a fishing gear by carrying it, and walking along the river, greatly affecting the health of fishermen, especially for feet that are too long submerged in water, as well as limited fishing grounds. This obstacle can be overcome by using a simple, inexpensive and reliable floating tool for coastal areas, rivers and shallow and not fast-flowing mangrove forest waters. So it is necessary to do research to be able to realize floating tools that are in accordance with the conditions of the waters. The floating tool research activity is expected to be beneficial for the coastal communities of deesa Bedono, Sayung Subdistrict, Demak Regency, Central Java, especially to increase the fishing yield and welfare of the fishing community. The analysis results of the floating appliance ability receive loads up to 300 kg / drum so that the capacity of 1 tool module can be planned for 3-4 people. With affordable costs, it can be applied to the community.

Applications of technology and machinery equipment in service activities ABSTRAKKegiatan pengabdian aplikasi teknologi dan peralatan permesinan dilakukan untuk menyempurnakan renovasi dan perbaikan perahu atau kapal kayu. Pengembangan kelengkapan sarana anggota kelompok nelayan pada saat ini difokuskan pada peralatan untuk perbaikan dan renovasi lambung atau bodi dan perawatan mesin penggerak. Dan untuk penyempurnaan renovasi atau perbaikan kapal kayu, tim pengabdian menyusun langkah kerja atau kegiatan pengabdian meliputi pemahaman dan pendalaman perahu atau kapal kayu, teknik dan peralatan renovasi dan pembuatan perahu, pemahaman dan pendalaman kerusakan kapal, dan sejenisnya dan pelaksanaan di kelompok nelayan. Proses perawatan dan perbaikan kapal pada bagian badan kapal (lambung kapal) di mitra nelayan pada prinsipnya dilakukan melalui beberapa tahapan meliputi pencucian seluruh bagian kapal, penambalan (pemakalan), pendempulan dan pengecetan kapal. Proses pengecatan melalui beberapa tahapan yakni pembersihan permukaan, penambalan kalau ada yang mulai retak dan berlubang, pengeringan, penghalusan, pelapisan dasar dan pengecatan. Beberapa peralatan perawatan dan perbaikan lambung perahu terutama untuk renovasi dan pembuatan perahu kayu meliputi gergaji kayu (mesin dan manual), bor, pasah, gerinda, tatah (berbagai ukuran), clem/pencepit dan peralatan pendukung lain Kata Kunci: perahu sopek, lambung, mesin penggerak, permesinan