ISO 20283-5:2016

Overview

ISO 20283-5:2016 - Mechanical vibration - Measurement of vibration on ships - Part 5 - provides guidelines for measuring, evaluating and reporting vibration with regard to habitability on passenger and merchant ships. It defines how to capture overall frequency-weighted r.m.s. vibration in the 1 Hz to 80 Hz band and gives guideline values (maximum frequency-weighted r.m.s. levels) for different ship areas. The standard applies to passenger and merchant ships with intended voyages of 24 hours or more and focuses on occupied spaces where crew and passengers live and work.

Key Topics and Requirements

• Instrumentation: Measurement systems must meet ISO 8041 requirements; instruments should be calibrated (reported) at least every 2 years. Functional checks (mechanical excitation) are required before and after measurement series.
• Frequency weighting & range: Overall measurements cover 1 Hz–80 Hz using the specified frequency weighting (W) in Annex A.
• Measurement locations & sampling: Guidance on selecting locations to characterise ship habitability; recommended sample ratios include crew accommodation ≥30%, work spaces ≥20%, and passenger cabins ≥10% (Table 1).
• Transducer placement & orientation: Sensors placed at typical duty or occupancy positions, at least 1 m from walls; axes measured are longitudinal, transverse and vertical. Mounting provisions for rigid and soft floors are specified.
• Measurement conditions: Preferably during acceptance/performance trials under defined conditions (free-route straight course, constant propulsion, sea state ≤3, full propeller immersion, water depth ≥5×draught, normal operation of onboard systems). If dynamic positioning (DP) is a normal operational mode, additional DP-mode measurements are required.
• Evaluation & reporting: Specifies analysis methods, guideline vs excessive vibration values, treatment of beating, and content of a formal test report. Permanent electronic records are recommended for further analysis.

Applications

• Use ISO 20283-5 for: ship acceptance trials, habitability assessments, crew comfort studies, contractual vibration specifications, and comparative benchmarking of vessels.
• Helps shipbuilders, shipowners and operators ensure spaces meet habitability criteria and supports improvements to HVAC, propulsion, mounting, or isolation measures to reduce perceptible vibration.

Who Uses This Standard

• Naval architects, vibration engineers, shipbuilders, shipowners/operators, classification societies, onboard comfort consultants, and regulatory/compliance teams involved in vibration testing and reporting.

Related Standards

• ISO 8041 - Measuring instrumentation (instrument requirements)
• ISO 2631-1 / ISO 2631-2 - Evaluation of human exposure to whole-body vibration (low-frequency motion and building vibration)
• ISO 20283-2 - Global structural vibration assessment on ships

Keywords: ISO 20283-5, vibration measurement, ship habitability, frequency-weighted r.m.s., crew comfort, vibration reporting, measurement procedure.