Review of the seakeeping criteria for the study of a passenger ship criteria in Indonesian water

Abstract

The human sickness of the ship’s crews and passengers is considered as main requirements to be fulfilled in ship design stages which is related to the performance of ship motion when operating in seaway. This paper describe review some seakeeping criteria which are published by several institutions for the purpose of ship safety and comfort. Since these criteria were initially issued based on extreme sea conditions, it is necessary to study if they are applied to relatively moderate sea conditions in Indonesian. For this reason, a new approach is proposed to deal with a new criteria by measuring motions directly on the ship in operation. Briefly method is described as first, the ship motion in 6 degrees of freedom is measured by sensors which is installed in a particular place on the ship’s board, for which the data generated include an angular velocity, a vertical and a tranversal accelerations of motions. Second, Fast Fourier Transform (FFT) algorithm is adopted to process the measured data which are presented in the form of time series and spectrum diagrams, and the Power Spectral Density (PSD) method is also used to eliminate nois data. Third, the ship motion criteria for the case of the passenger ship is determined and it compare to the existing criteria.

Direct Measurement of Motion on Fast Ferries

“…The application of equation ( 3) in the field of marine and marine engineering has been introduced by Weinblum & St. Denis (1950) and St. Denis & Pierson (1953) [1], which shown as illustration in Figure 2. The equation to get the ship's response should be done smoothing and filtering the results of FFT [1,14,15]. This is intended to eliminate noise that occurs in the result data and to get more accurate results.…”

“…In direct measurement, three important factors must be considered to give the appropriate results including (i) the accuracy of the instrument device, (ii) the accuracy of the measurement process, and (iii) the processing of the measurement data recorded. In the previous paper [14], an analysis of the selection of tools and determination of the measurement location was introduced. Meanwhile, the identification method of fast ship motion using direct measurements technique is presented in this paper.…”

Assessment of passenger comfort on the fast ferry operating in the strait of Malacca

“…In many parts of Indonesia, inter-island passenger transportation is used, therefore ensuring the safety and comfort of the ship takes greater care. The Malacca Strait is a waterway that is passed by many passenger ships [1], for example, fast passenger ships operating from Bengkalis to Batam port, Indonesia. The data also shows that there are frequent accidents on the track in this area [2].…”

“…Up until now, the standard used to determine ship comfort has been seakeeping criteria at the time of shipbuilding design. However, this is not sufficient as a design criterion alone [1], and measurement of navigational quality under service conditions [3] must be carried out because comfort is a key parameter in the design and operation of passenger ships. The main factors affecting comfort are the motion and acceleration experienced by ships while sailing rough waves, which are known to have an impact on passenger comfort and hamper navigational tasks for the crew [4].…”

“…The main factors affecting comfort are the motion and acceleration experienced by ships while sailing rough waves, which are known to have an impact on passenger comfort and hamper navigational tasks for the crew [4]. In addition, previous research has demonstrated that human error is a major cause of ship accidents [1]. Where human factors account for up to 60% of high-speed ship accidents [1].…”