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Hardi Zen
Balai Teknologi Hidrodinamika - BPPT
Engineering

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Frais chisel Shaft Strength Calculation on the Model in the Laboratory Hydrodynamic Suyadi Suyadi; Hardi Zen
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 2 No 2 (2017): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v2i2.1189

Abstract

A process process in the manufacture of milling machines Keyway (slot) propeller shaft models - ship propeller is routine work done in BTH-BPPT. The main work in this process requires the use of a standard cutting blade milling (Hight Speed Steel), therefore the technical study on the magnitude of cutting force is needed in predicting the service life of the milling blade. To get the service life of the chisel eye analysis in the process of cutting with a knife cut milling standard (HSS) where the variables selected in this machining processes such as engine speed is very influential parameter to change the style, torque and strain. The results showed that for the process sharpener at rpm 400 rpm and 500 rpm eyes chisel operating under normal conditions, while at rpm 785 rpm chisel eye operating at extreme conditions in which the generated strain of 39.6 Ksi and lifespan chisel 138 operational days 4,5 frais chisel or a calendar month.
Kajian Eksperimental Koefisien Redaman Akustik Bahan Pelapis Plat Dek Kapal Wibowo Harso Nugroho; Nanang J H Purnomo; Hardi Zen; Andi Rahmadiansah
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 3 No 1 (2018): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v3i1.1511

Abstract

With the increasingly strict requirements of the ship classification bureau for permissible noise limits to allow passengers and crew to be more comfortable and secure a technical assessment is required to address the characteristics of the noise. A noise beyond the standard allowed in the vessel can be a problem to the ship operators. This noise problem will greatly affects the crews' comfort and passengers. One method to reduce the noise on a ship is to use sound insulation. This paper describes the method for determining the absorption coefficient α and the transmission loss (TL) through an acoustic test of a concrete insulation in the laboratory. The test was conducted by using the method of impedance tube where a speciment response measured by a microphone. In general, the properties of this insulation material remains as the main base material which is concrete. it has been found that the transmission loss value (TL) is in the range of 10 - 50 dB whereas for the base material the concrete is around 22 - 49 dB but the absorption coefficient α of the specimen material is much higher than the material of the base material especially in high frequency, which ranges from 0.15 to 0.97, whereas for concrete base materials have absorbent coefficient α ranges from 0.01 to 0.02.
Co-Authors Andi Rahmadiansah Nanang J H Purnomo Suyadi Suyadi Wibowo Harso Nugroho