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We're exhibiting at SMM Hamburg · Sep 1–4, 2026 · Hall A3, Stand 126

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— Independent Propulsion Shafting Measurement · Maritime Industry

Torsional vibration Measurement. Assessed against class criteria.

Rotec Marine Engineering brings decades of RASdelta measurement practice from automotive, motorsport, and power-plant applications into shipping — independent torsional vibration, vibration, and alignment measurement for shaftlines and propulsion trains, per IACS UR M68 and ISO 20816.

Standards basis: IACS UR M68· ISO 20816· ISO 6954· MIL-STD-167· ISO 15016 

 

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Three measurements, one shipyard visit

01

Torsional Vibration Measurement

Angle and phase measurement along the shaft-line across the full operating speed range incl. engine vibration damper, transmissions, shafts.

02
 

Real-Life Power Measurement 

Actual transmitted shaft power under real operating conditions — determined via strain-gauge torsion measurement.                           

03
 

Drivetrain Vibration Analysis

Broadband vibration measurement on engines, gearboxes and generators including structure and air-borne noise measurement.         

Torsional vibration, power verification, vibration analysis, and shaft alignment

can be combined into a single coordinated measurement campaign —

from newbuild acceptance through to the existing fleet.

Cross-Industry Precision

Measurement technique and evaluation experience honed over decades in automotive, Motorsport, and power-plant applications — carried across to the marine propulsion train.

Independent, Not Manufacturer-Tied

We don't sell engines, gearboxes, or shafts — only the independent measurement and assessment that shipyards, shipowners, and classification societies can equally trust.

Close to Class, Not Just the Textbook

Evaluation against the actual class criteria — IACS UR M68, the ISO 20816 series, ISO 6954 — not just general engineering practice.                                                                         

On Site in Hamburg

Meet us at SMM 2026

Four days, one topic: the shaftline. Bring your next newbuild, retrofit, or failure-case question to the stand — we'll walk through it with you on the spot, using real measurement data from live projects.

 

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A Solid Standards Basis

Measurement Tied to Recognized Regulatory Frameworks

Every evaluation is referenced back to the applicable regulatory framework — civil and military alike.

IACS UR M68 — Shaftline Torsional Vibration ISO 20816 / 10816-6 — Machinery Vibration ISO 6954 / 2631 — Habitability & ComfortISO 15016 — Speed/Power Trials MARPOL Annex VI — EEXI & CIIMIL-STD-167-1/-2 — Navy Propulsion Shafting

Frequently Asked Questions

Briefly Explained

Have Question? We are here to help

What is a torsional vibration measurement?

It captures the rotational non-uniformity of a marine propulsion shaftline, non-invasively, across the full operating speed range, to verify torsional stresses and barred-speed-range behaviour against class-relevant limits.

Which standard governs torsional vibration of marine shafting?

The governing standard is IACS Unified Requirement M68, which has been adopted into the rules of all major classification societies — DNV, ABS, Lloyd's Register, ClassNK, and others.

When is class approval of the shaftline required?

For every newbuild, for retrofit or re-powering involving a changed engine, gearbox, or shaft train, and following damage events on the shaftline. 

What distinguishes torsional vibration from general machinery vibration?

General machinery vibration under ISO 20816 covers housing and shaft vibration perpendicular to the axis of rotation and explicitly excludes torsional vibration. Torsional vibration concerns the rotational non-uniformity itself and is assessed separately under IACS UR M68.