Accurate estimation of standard time in ship block assembly is critical for production efficiency but remains challenged by the subjectivity of experience-based methods. This study proposes a systematic, simulation-based approach to determine standard...
Accurate estimation of standard time in ship block assembly is critical for production efficiency but remains challenged by the subjectivity of experience-based methods. This study proposes a systematic, simulation-based approach to determine standard time by rigorously defining normal time and allowance rates. Normal time is objectively derived from 3D CAD geometric data and joint specifications. To address the inherent variability of on-site operations, the allowance rate is modeled as a probability distribution rather than a deterministic value, integrating the Westinghouse Rating System for worker characteristics and International Labour Organization standards for environmental factors. By employing Monte Carlo simulation, the study generates a probabilistic distribution of standard time, reflecting real-world uncertainties. Validation against actual process data demonstrates that this stochastic model provides a more reliable prediction range than conventional techniques. Ultimately, this framework enables the establishment of target times based on specific confidence levels, offering a scientific basis for precise process management and scheduling in the shipbuilding industry. Keywords : Ship Block Assembly, Standard Time, Allowance Rate, Monte Carlo Simulation, Probabilistic Approach