A Study on G-Modulus Measurement Using Strain Gauge Method for Accurate Shaft Power Measurement
- Kyong-Min Bae (Research Institute of Medium&Small Shipbuiliding) | Sung-Won Yoon (Research Institute of Medium&Small Shipbuiliding) | Jong-Rok Ha (Research Institute of Medium&Small Shipbuiliding) | Jun Seok (Research Institute of Medium&Small Shipbuiliding) | Je-Hyoung Cho (Research Institute of Medium&Small Shipbuiliding)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- torsional shear strength, EEDI, eco-ship, IMO, shaft horsepower, <em>G</em>-modulus, tensile strength
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- 15 since 2007
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The trial run of ships has become a more important issue which will evaluate the speed performance of the ship, due to the fact that IMO enforces the application of EEDI to new vessels. G-modulus is one of the most important factors for speed performance measurements of ships. Therefore, ISO suggested to adopt standard values (82.4 GPa), if shipbuilders cannot prove other values through actual shaft torsional tests. However, this standard value is not accurate to measure the G-modulus of the actual shaft. Hence, we obtained the G-modulus measured by specimen test and compared it with the ISO standard value.
Since industrialization, the increase in the use of fossil fuels by humans has increased CO2 emissions. As a result, the global warming phenomenon is accelerating and has a very negative influence on the global ecosystem and human life environment. Since 1992, the international community has adopted a convention to prevent the cause of global warming and abnormal weather phenomena (Ančić and Šestan, 2015; Psaraftis, 2016; Koo, 2010).
While the CO2 emissions at sea are only about 3.3%, International Maritime Organization (IMO) is strictly regulating CO2 emissions. Marine Environment Protection Committee (MEPC) of IMO adopted mandatory regulations to progressively reduce CO2 emissions from ships. The international community actively encourages the adoption of the following measures as a way to reduce CO2 emissions; (1) The method of shipbuilding with energy-efficient technology, (2) The method to save fuel during sailing (IMO, 2014; Ančić and Šestan, 2015; Bitner-Gregerse et al., 2016; Psaraftis, 2016; Roh, 2013).
As a result, global shipping companies and shipyards have faced challenges that must meet environmental regulations and improve energy efficiency. The Energy Efficiency Design Index for new ships (EEDI) and the Ship Energy Efficiency Management Plan (SEEMP) were enforced on all merchant vessels engaged in international voyages of 400 tonnes or more, which were established on January 1, 2013 (Ančić and Šestan, 2015; Attah and Bucknall, 2015; Bitner-Gregerse et al., 2016).
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