For the assessment of ship vibration performance, the actual vibration levels at the most critical locations are to be measured and evaluated during the sea trials. Section 6 provides guidelines on the vibration measurement procedure on the instrumentation, measurement conditions and locations, data processing and reporting. Section 7 provides acceptance criteria on the vibration limits for human comfort and habitability, local structures and machinery based on international standards and practice in ABS.
The shaft alignment and torsional vibration are not directly addressed in this document. For the requirements of the shaft alignment and torsional vibratory stress, refer to 4-3-2/7 of the ABS Steel Vessel Rules. The overall procedure for ship vibration assessment recommended in these Guidance Notes is shown in Section 1,