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All Journal Proceedings Conference on Marine Engineering and its Application
Poernomo Heroe
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Engineering Mechanical Engineering

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OPTIMASI RESCHEDULE PEMBANGUANAN KAPAL KELAS 1 KENAVIGASIAN (KN. BACAN) DI ORELA SHIPYARD DENGAN LINIER PROGRAMING Rosita Elen; Poernomo Heroe; Arumsari Nurvita
Proceedings Conference on Marine Engineering and its Application Vol 1 No 1 (2018): Conference on Marine Engineering and its Application
Publisher : Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33863/cmea.v1i1.651

Abstract

In a shipyard, shipbuilding process is inseparable from scheduling determined by the company. Although in the course of time a project usually meet obstacles in the process resulting on delays in building process and ship delivery. Pert Method (Project Evaluation Review Technique) is used in a project to find the critical path on network diagram in order to make time configuration becomes more effective. Furthermore crashing method is used by adding work hours to lessen lateness and excessive project cost. Duration accelerating used on critical path track, then cost minimilization and also linear programming time optimization completed by simplex approach on solver. The results obtained from time-planning calculation using network planning with Project Evaluation Review Technique (PERT) is applicable for the company on time and cost because the normal time which is 924 days could be crashed for 11 days into 913 days, increasing the efficiency on time and costs, the normal cost is about Rp Rp. 1,747,940,000 and the costs after crashing about Rp. 3,387,463,353. Results from Simplex LP (Linear Programming) for post-crashing duration is the optimum time because there is no change on solution’s solver in which the time is constant. The cost minimalization generated by simplex LP is Rp 6,046,912 day from crashed works. For a total duration of 11 days the minimum cost incurredis Rp. 66,516,03.
Analisa Getaran Pada Air Fin Cooler Equipment 203-E-003-M4 Akibat Misalignment Poros Samudra Budi Agung; Poernomo Heroe; Wirawan Husodo Adi
Proceedings Conference on Marine Engineering and its Application Vol 1 No 1 (2018): Conference on Marine Engineering and its Application
Publisher : Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33863/cmea.v1i1.688

Abstract

This research performs vibration response analysis on fin cooler water system (AFC). AFC is a fan or blade equipment that rotates and driven by the motor. AFC have problems of high vibration value, so disrupting the production process. From the case obtained the purpose of research to get the value of vibration response that occurs on the shaft of water fin cooler and the influence of misalignment on the shaft. From the vibration data, analyzed the breakdown that occurred. To prevent vibration and breakdown, failure evaluation with Predictive Maintenance method is performed. In the research, the result of natural frequency is 26,77 rad/s and vibration velocity response is 0,0000392 mm/s. Vibration rate response with 0.05 mm shaft misalignment of 0,0000496 mm/s is still permitted by ISO Severity 10618-3 standard. The result of AFC reliability at 24 hours cause a reliability value of 0.995. Then the failure prediction of AFC component will occur at 15773,42 hours or 657 days, then result of the calculation of treatment time after further analysis using dynamic system predicted to be done within 1738 hours or 72 days.
Co-Authors Arumsari Nurvita Rosita Elen Samudra Budi Agung Wirawan Husodo Adi