Analisis getaran dan kebisingan pada kamar mesin dan geladak penumpang kapal cepat Aluminium

Abstract

Ship vibration is part of the problem with ship dynamics. In addition to producing noise that disturbs the comfort of crew and passengers, engine structures and components can be damaged due to vibrations that are too high, resulting in material fatigue and material deformation. In order to avoid the damage that occurs and in order to improve the comfort of passengers and crew, shipbuilding must comply with vibration and noise standards. This study aims to analyze the value of vibration and the value of noise that arises on the aluminum fast boat as a result of excitation in terms of the main engine. Calculation of natural frequency and mode shapes is done using ship modeling with Finite Element Analysis Software. The excitation frequency of the main engine is 35.014 Hz. Based on the system's amplitude calculation, the values range from 3.273 x 10-7 to 2.703 x 10-6. Then the vibration standard values obtained are in the range of values from 0.253 to 2.093. Then, the noise radiation value obtained is in the range of 134,582 dB to 130,449 dB. All research results regarding vibration and noise standards in the engine room and passenger deck of aluminum ships obtained results that meet the standards, so it can be concluded that the ship's construction is safe from excessive vibration and noise.

Analysis of Engine Room Vibration of Tugboat 24 M

“…From the natural frequency value that has been obtained in the previous stage, a graph curve is obtained as shown in Figure 7 Furthermore, the calculation of the standard value of vibration is carried out. Referring to the ABS standard, it is known that the longitudinal vibration of the propulsion system is considered excessive if the Root Mean Square (RMS) acceleration amplitude is greater than 0.25 * g. For example, to find Arms from the vibration amplitude in a system with the 100th mode, it can be obtained using equation (3), which is as follows: Then after getting the standard value for vibration, noise standard analysis is carried out according to IMO standards. Because the natural frequency value obtained from the first 200 forms of the FEA Software analysis is less than 1kHz, the value of the noise radiation level can be determined using the following equation ( 4), so that the noise value is obtained:…”

“…From the natural frequency value that has been obtained in the previous stage, a graph curve is obtained as shown in Figure 10 Furthermore, the calculation of the standard value of vibration is carried out. Referring to the ABS standard, it is known that the longitudinal vibration of the propulsion system is considered excessive if the Root Mean Square (RMS) acceleration amplitude is greater than 0.25 * g. For example, to find Arms from the vibration amplitude in a system with the 100th mode, it can be obtained using equation (3), which is as follows: ARMS = 0.00153328…”

“…The strength of the ship's construction needs to be considered. Because the data shows that ship vibrations that are not analyzed properly result in structural failure on the ship including the engine room and can affect the health of crew members when exposed to noise due to vibrations that are not up to standard [3].…”

“…FEM is one of the methods used to find the value of the natural frequency (natural frequency) in an object, then used to obtain the value of the amplitude and standard of vibration. 3D modeling of engine rooms and decks on finite element-based software is one way to simulate actual conditions so that research results are expected to be accurate [3].…”

Analisis getaran lambung kapal patroli 28 meter

“…Keausan dan kerusakan serta perubahan bentuk akan merubah karakteristik dinamis sistem yang cenderung dapat meningkatkan energy getaran. Berdasarakan penelitian sebelumnya untuk pada kapal nilai standar getaran pada kapal aluminium yang didapatkan berada di rentang nilai 0.253 hingga 2.093 [17]. Respon getaran yang terjadi pada struktur kapal yang disebabkan oleh frekuensi eksitasi mesin dapat dikenadalikan dengan modifikasi struktur kapal [10].…”