Abstract: In order to accurately analyze the change laws of added mass and damping of sink roll models in different fluid media, an analysis model of theoretical calculation is established, and four kinds of models are tested in four kinds of fluids. Using the hammer method, the modal tests in air are performed on the sink roll models with and without rods. Respectively, the result is highly consistent. The analysis of the test results of the tie-in model show that the first six orders of frequency response function curved in water and hydraulic oil are obvious, however only the first three orders are significant in glycerol; the viscosity change of glycerol has little effect on the natural frequency of the model, but the viscosity increases with the increase of the added damping coefficient. With the increase of the liquid density, the corresponding added mass coefficient of each mode of the model increases linearly. Otherwise, when the structure's mass and stiffness increases, the increasing slope decreases. With the increase of structural density, the added mass coefficient of the model decreases; the added mass coefficient of all models (1,2) and (2,2) are greater than the bending mode.

Key words: model of sink rolls, modal test, added damping, added mass, fluid density