Validation of Quasi-steady Model Propulsion Tests
Author M. Verhulst
Title Validation of Quasi-steady Model Propulsion Tests
Conference/Journal AMT'15
Month September
Year 2015

Abstract
During a measurement run of a quasi-steady model propulsion test, the loading (RPM) of the
propeller(s) is gradually changed at a constant carriage and model speed. By this method it is
possible to efficiently capture loading effects for each speed. Already after the first measurement
run complete and accurate extrapolation to full scale can be made. Loading effects are also
important in case of mutual interactions between various propulsor components, e.g. a hybrid
propulsion system.

MARIN wants to introduce the quasi-steady test technique in daily practice to replace gradually the
conventional steady approach. Therefore a validation programme was started to compare results
obtained with both techniques for five different models. Both single and twin propeller and pod
ships are have been tested ranging from a cargo to a cruise ship, using identical setups and
conditions for both methods.

Several details of the experimental procedure are discussed. The influence of the regression
analysis and numerical model was investigated. Results of the validation programme show a good
agreement between the conventional and quasi-steady propulsion test procedures.

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