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Journal : Proceedings Conference on Marine Engineering and its Application

Kajian Ekperimen Pengaruh Pemasangan Silinder Sirkular Bervariasi Diameter dengan Posisi X/D = 0.5 dan Y/D = 0.7 pada Sisi Advancing Blade Terhadap Performa Turbin Air Savonius Difa Falahudin; Priyo Agus Setiawan; Arie Indartono
Proceedings Conference on Marine Engineering and its Application Vol 3 No 1 (2020): Conference on Marine Engineering and its Application
Publisher : Politeknik Perkapalan Negeri Surabaya

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Abstract

Savonius water turbine has the opportunity to be developed. An innovation is needed toimprove the performance of savonius water turbines. An experimental study on the effect of installing acircular cylinder with varying diameters on the advancing blade side of the savonius water turbineperformance needs to be carried out. The experiment used savonius water turbine myring n = 1 andmyring n = 2 with a diameter and rotor height of 40 cm each. Circular cylinder diameter variations usedare ds/D=0.2, ds/D=0.3, and ds/D=0.4. Circular cylinder is positioned at a distance of X/D=0.5 andY/D=0.7. The result is the coefficient of torque (Ct) and the coefficient of power (Cp). In addition, thediameter of the circular cylinder that is capable of producing the best performance of Savonius waterturbines will be obtained. The results of the experiment indicate that the installation of a circular cylinderon the advancing blade can improve the performance of savonius water turbines. Variation in circularcylinder diameter ds/D=0.4 results the highest Ct and Cp values in the savonius water turbine myringn=1 and myring n=2. Myring n=1 turbine experiment shows the value of Ct obtained is 0.34 at the tipspeed ratio (TSR) of 0.73, while in myring n=2 turbine, the value of Ct obtained is 0.34 at TSR 0.49.Myring n=1 turbine experiment shows a Cp value of 0.25 at TSR 0.73 (showing an increase of 66.67%),whereas in myring n=2 turbine, the Cp value obtained is 0.16 at TSR 0.49 (showing an increase of21.43%).
PENERAPAN METODE EARNED VALUE ANALISIS (EVA) PADA PROYEK REPARASI KAPAL Silas Tandi; Arie Indartono; Arum Nurvitasari; Dodiek Kurniawan
Proceedings Conference on Marine Engineering and its Application Vol 6 No 1 (2023): Conference on Marine Engineering and its Aplication
Publisher : Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33863/cmea.v6i1.2676

Abstract

Delays in completing the project are things that must be avoided, because in addition to adversely affectingthe credibility of the contractor, it also causes losses in terms of project time and cost or cost overrun, where the workdone is not in accordance with the planned time and the cost is not in accordance with the budgeted so that it requiresadditional costs to complete the project. The Earned Value method is a method used to manage project costs andschedules in a structured manner. This method can provide information on the status of project performance in a reviewperiod and information on predicted costs and time for completion of all work based on performance indicators at thetime of review. Project performance on ship repair TB. Big Fair 15 from the calculation of CV and SV in reviews 1, 2and 3 is negative and so is the calculation of CPI and SPI in reviews 1, 2 and 3 is negative or less than 1. This indicatesthat the cost used to complete the project is greater than the plan. However, for the 4th review, the results of the CVand SV calculations show a positive value, which means that the cost of completing the project is in accordance withthe plan as well as the CPI and SPI at the 4th review show a positive value, which means that the cost of completingthe project is in accordance with the plan. Based on the analysis that has been done, the time required to complete theremaining work is 10 days and in this ship repair project there is a cost overrun of Rp. 107,332,706 with a cost budgetof Rp. 459,273,994. After a review using Earned Value Analysis, the results are obtained for each review, where review1 weighs 12.93% at a cost of Rp. 73,267,561 and review 2 weighs 45.17% at a cost of Rp. 255,915,724 and review 3weighs 26.58% at a cost of Rp. 86,839,784.