LARGE AMPLITUDE ROLLING EXPERIMENT TECHNIQUES

This paper describes the techniques used at British Maritime Technology Ltd. for large amplitude rolling experiments. Roll decrements, steady forced roll tests and transient forced roll tests are discussed and sample results are given. The experiments at BMT make use of a gyroscopic roll moment generator which produced a pure sinusoidal roll moment, even at large roll amplitudes. The theory and calibration of this equipment are presented. The associated instrumentation and analysis software which permit effective research into the nonlinearities of large amplitude rolling are also described.