Abstract
Small high speed passenger crafts (HSC) are commonly known for their poor seakeeping qualities. These crafts are frequently exposed to large slamming impacts and these repetitive shocks may pose danger to passengers’ safety and health. In Malaysia, small high speed passenger crafts having lengths between 7 to 9 meters are mainly used to transport tourists between popular island destinations. Evaluation on impact and vibration for this type of craft was conducted by using accelerometers attached to several locations on craft’s deck. The test was conducted at speeds ranged between 20 to 30 knots and the highest peak accelerations were recorded. The highest acceleration record during the sea trial was recorded at 4.22 g and the average acceleration measure is 2.20 g. Apart from this test, evaluation on effectiveness of the current foam seat typically used in this craft were evaluated using Dynamic Response Index (DRI) and results have shown that the seat is less efficient when impact reaches more than 1g at speeds of more than 20 knots. It is concluded that safety measures such as the use of more efficient suspension seat and limiting the operational speed need to be taken into consideration.
Highlights
One of the major concerns related to small high-speed craft is the slamming impacts
Experimental results are divided into two sections, slamming impact accelerations experienced by the boat during the test and the effectiveness of ordinary seat foam normally used as seat cushion on a typical boat
Rosén et al,(2017)[25] has concluded that cut-off frequency of 30 Hz was appropriate after comparing and combining simulated and experimental data from extensive model experiments performed at the University of Naples “Federico II” (UNINA) and simulations performed at the Royal Institute of Technology (KTH)
Summary
Small high-speed craft (HSC) which typically have small displacement and length are commonly known as having low seakeeping qualities. As these crafts weight is mainly carried by hydrodynamic force when moving, small high-speed craft are categorized as planing craft (Taunton et al, 2011)[1] and are exposed violently to large slamming impacts when the craft impacts the wave surface (Razola et al, 2016)[2]. These large slamming impacts resulted in large vertical accelerations of the HSC.
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