International Shipbuilding Progress - Volume 68, issue 3-4

Authors: Wellens, Peter

Article Type: Editorial

DOI: 10.3233/ISP-220107

Citation: International Shipbuilding Progress, vol. 68, no. 3-4, pp. 79-79, 2021

Authors: Guan, Guan | Liao, Hongling | Yang, Qu

Article Type: Research Article

Abstract: In order to effectively improve the assembly efficiency for hull blocks, an assembly simulation analysis method considering engineering constraints is proposed in this paper, and an integrated system of shipbuilding accuracy analysis and assembly analysis considering multi-constraints is developed. The method is divided into pre-matching model and fine matching model. In the pre-matching model, an Improved Coherent Point Drift (ICPD) algorithm is used to obtain more accurate initial matching values. The fine matching model firstly uses the Analytic Hierarchy Process (AHP) algorithm to automatically obtain the constrained weights, then the weights vector is used to add the assembly constraints for …hull blocks such as straightness, hard point constraints etc. into the multi-objective optimization function. By solving the function, the optimum positioning location and the most reasonable adjustment scheme are obtained. This method shortens the occupancy time of the equipment used to build the hull, reduces the workload of the staff, and improves the efficiency and quality of shipbuilding. The integrated system adds engineering constraints analysis module and the function of automatically finding and eliminating error measurement points. Through the verification of the examples, the integrated system realizes the automation and intellectualization of the assembly for hull blocks. Show more

Keywords: Hull blocks, assembly simulation, engineering constraints, ICPD, weights vector

DOI: 10.3233/ISP-210009

Citation: International Shipbuilding Progress, vol. 68, no. 3-4, pp. 81-104, 2021

Authors: Branowski, Bogdan | Zabłocki, Marek | Gabryelski, Jarosław | Walczak, Andrzej | Kurczewski, Przemysław

Article Type: Research Article

Abstract: Introduction: In connection with the design of a seaworthy yacht for persons with disabilities, authors conduct a risk analysis and consider the safety aspects arising from these risks. In the context of tourism and recreation for people with disabilities, this represents a new issue in the literature. Aim: The aim of the analysis was a multi-aspect evaluation of the hazards that occur when sailors with disabilities carry out typical activities on a yacht. The recommendations arising from the conducted research were used when designing the structure of a staysail schooner intended to be sailed by people with disabilities. …Methods: Two methods of risk analysis were adopted. A preliminary hazard analysis (PHA) was carried out with the purpose of identifying and evaluating the possibility of people with various types of disabilities carrying out activities on a yacht. A process hazard analysis (PRHA) was based on a four-degree structure of functions with 31 component operations, relating to both sailing and living on a yacht. This methodology was used by the authors in sailing for the first time when the yacht’s equipment was designed for persons with disabilities. Results: The evaluation covered the adaptation of the yacht for sailing by people with disabilities and considered the various functions that would need to be carried out by these people. A PRHA matrix was created, consisting of 1,116 fields. Authors found that safe execution of many of the relevant functions by people with various types of disabilities was indicated. Conclusions: Based on the results of the PRHA, a set of new guidelines was created for permanent and temporary adaptations of a yacht in the context of the degrees and causes of disabilities. Show more

Keywords: Persons with disabilities, yacht design for safety, PHA, PRHA

DOI: 10.3233/ISP-201007

Citation: International Shipbuilding Progress, vol. 68, no. 3-4, pp. 105-128, 2021

Authors: Montecchiari, Gabriele | Bulian, Gabriele | Gallina, Paolo

Article Type: Research Article

Abstract: The topic of evacuation analysis plays an important role in the maritime field, because of its natural link to safety and also because of relevant SOLAS requirements. In this context, this paper focuses on the description, testing and validation of an agent-based mathematical model. As primary goal, the model has been developed targeting a use in evacuation simulations using immersive virtual reality, also with the possibility of real-time human participation. At the same time, the model is suitable also for standard evacuation simulations. The model has been developed starting from existing social force models and introducing a series of improvements, …modifications, new modelling, and adaptations. The model is described in detail, providing and discussing all adopted parameters. The choice of a game engine as development environment is also discussed, highlighting benefits and limitations. Results from IMO test cases, validations using experimental data, and comparisons with FDS+Evac are presented. A more realistic test case, relevant to the maritime field, with a two-cabin-deck geometry is also presented, together with corresponding simulation results. Particular attention is paid to the post-processing and reporting of the results from Monte Carlo simulations, in order to properly reflect, quantify and emphasize the underlying aleatory uncertainty. Show more

Keywords: Agent-based simulation, evacuation, IMO, passenger ships, social force model

DOI: 10.3233/ISP-210017

Citation: International Shipbuilding Progress, vol. 68, no. 3-4, pp. 129-189, 2021