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Item type:Publication, Access status: without files , Digital assistance systems for just-in-sequence packing: key enablers for productive shipyard assembly(Springer, 2026-09-18); ; ; ; Assembly personnel in one-of-a-kind shipbuilding dedicate only a small proportion of their on-site time to value-adding activities, with non-productive tasks consuming up to 78% of their working hours. Considerable effort is expended on material procurement, information retrieval, and preparation of work sites. In addition, evolving customer requirements and internal planning deviations lead to frequent design changes in the production phase, resulting in substantial rework and elevated scrap rates. This is particularly evident for pipes, fittings, and related accessories, which are integral to numerous onboard systems throughout the vessel. Coordinating their delivery through traditional sequential scheduling results in redundant handling due to time-consuming retrieval processes for pre-manufactured parts by suppliers, and complex on-site material provision by shipyard logistics. A promising approach to overcome these challenges is to schedule frequent, small-batch deliveries in line with construction progress. While synchronizing supplier production and delivery with the assembly progress has proven to be an effective solution in automotive serial production, its application in one-of-a-kind shipbuilding is severely limited by the poor availability and accessibility of up-to-date information. To bridge this gap, this paper examines the picking and packing of installation-ready units by suppliers through the systematic use of prototype digital assistance systems integrated with a consistent database. Ultimately, this approach aims to significantly enhance the productivity of shipyard assembly workers and accelerate overall ship delivery schedules.Publicationtype: Conference Paper54 6 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Synchronizing the shipbuilding supply chain with generic cumulative production figures(Springer, 2025-08); ; ; ; Shipbuilding is often characterized by a high complexity of the final product and a high variance of parts. Some shipyards even produce one-of-a-kind ships. Logistics performance of the shipbuilding supply chain, which is crucial for competitiveness of shipyards, is often limited due to long throughput times, high inventory levels and productivity losses, e.g., in material handling. Synchronizing supply with assembly processes in the shipyard can help to greatly reduce throughput times and inventory levels and to increase productivity, as the example of lean production in the automotive industry shows. However, neither conventional lean production concepts from high-volume production, nor existing approaches of shipyard production planning and control can support shipbuilding supply chain synchronization in a sufficient way. This paper presents a new concept for highly frequent planning and control of shipbuilding supply and production processes with a comparatively low information demand, which is based on a concept of Cumulative Production Figures (CPFs) from automotive production.Publicationtype: Conference Paper24 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , A coordinated approach to apply value stream analysis to the one-of-a-kind shipbuilding supply chain(Springer, 2025-08); ; ; ; In one-of-a-kind shipbuilding, shipyards rely on highly diversified supply chains involving multiple suppliers and subcontractors. The high complexity of the processes and the unique nature of the ships present challenges for the planning and coordination of the assembly at the shipyard and for production and logistics at the suppliers. The current organization leads to long delivery times, and high inventory costs. In addition, productivity losses occur due to extra work, e.g., searching for and modifying pre-manufactured components or delayed material supply at the assembly. Synchronizing the provision of materials from suppliers with the actual assembly offers promising potential for improvement. In one-of-a-kind production, Just-in-Sequence delivery is applicable only to a limited extent due to a lack of data and insufficient communication. The systematic use of digital assistance systems in the shipbuilding supply chain offers the potential to establish a consistent database and to provide user-oriented real-time information. As a first step, this paper performs an exhaustive analysis of the shipyard and supply chain processes regarding material and information flow, and the key figures from production planning and control. For this purpose, a value stream analysis adapted to the one-of-a-kind shipbuilding process was carried out at a shipyard and three of its suppliers.Publicationtype: Conference Paper59