A water surface model forced roll test device

Abstract

The invention relates to a water surface model forced roll test device, comprising a mounting base, a hole is opened in the middle of the mounting base, a vertical oscillation mechanism is installed in the hole, and the bottom of one end of the vertical oscillation mechanism passes through The combined sensor is connected to the combined pitch and roll mechanism. The present invention is compact and reasonable in structure and easy to operate. The test model is directly driven by the characteristics of the servo motor to realize the forced rolling motion. The trajectory of the rolling motion is controlled by a computer, which reduces the intermediate links and eliminates the existence of the rolling motion at the inflection point. The stagnation phenomenon greatly improves the motion accuracy and measurement accuracy of the device.

Description

technical field [0001] The invention relates to the technical field of test devices, in particular to a water surface model forced roll test device. Background technique [0002] The forced rolling test is an experimental method to obtain the hydrodynamic coefficient of the ship motion equation, and is an indispensable verification method for the theoretical research of ship hydrodynamics. In recent years, large-scale rolling motion and capsizing of ships, especially large-scale parametric rolling motion, have become a hot spot in ship academic circles. Its strong nonlinear factors have made numerical prediction a difficult point. Momentum is a key factor affecting numerical motion prediction. At present, the ITTC Wave Stability Committee has taken the prediction of large roll damping as one of its important research tasks, and the forced roll test is an effective means to verify the prediction of large roll damping. [0003] At present, the direct numerical prediction res...

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Problems solved by technology

[0006] At present, most of the ship model forced rolling test devices at home and abroad use eccentric wheel or cam mechanism or crank connecting rod mechanism, and the motor drive uses the transmission principle of eccentric wheel, cam mechanism or crank connecting rod mechanism to make the ship model realize the forced rolling motion. The disadvantage of this method is that the stagnation phenomenon at the inflection point exists when the eccentric wheel, cam mechanism or crank-link mechanism converts linear motion into rolling reciprocating motion, that is, sinusoidal motion, resulting in an error between the rolling motion trajectory and the required sinusoidal motion trajectory. Large, the error of the final measurement data is also large

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