A Forced Six Degrees of Freedom Motion Apparatus
A technology of kinematic instrument and degree of freedom, which is applied in the direction of instruments, fluid dynamics test, machine/structural component test, etc. It can solve the problems of lack of frequency correlation, etc., and achieve increased contact strength and motion stability, compact structure, The effect of easy operation
Active Publication Date: 2021-03-30
HARBIN ENG UNIV
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[0003] There are mainly two methods to obtain the hydrodynamic coefficient of the ship. One is the free attenuation test of the ship model swing, but the experimental results can only obtain the additional mass and damping of the ship at the resonance frequency, lacking frequency correlation; the other is a ship forced oscillation test
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[0019] The present invention will be further described below in conjunction with accompanying drawing example:
[0020] as attached figure 1 Shown, is the general arrangement drawing of the present invention; As attached figure 2 Shown is the front view of the experimental frame of the present invention; a forced six-degree-of-freedom motion instrument, including the experimental frame 1, the first pitch and roll connecting plate 3, the second pitch and roll connecting plate 4, the third horizontal and vertical It is composed of the rocking connecting plate 5, the fourth rolling and pitching connecting plate 6, the longitudinal torque servo motor driving device 2, the lateral torque servo motor driving device 7 and the gyrodynamic instrument 8. This device can perform seakeeping performance in the motion state of a six-degree-of-freedom ship model. Experiments are pitching, rolling, heave, yaw, surge and sway. Use the torque servo motor drive device to drive the pan and til...
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The invention belongs to the technical field of hydrodynamics experiments of ship model experimental tanks, and particularly relates to a forced six-degree-of-freedom motion instrument. The forced six-degree-of-freedom motion instrument includes an experimental machine frame, a pitching-rolling connecting rod and a torque servo motor driving device; forced six-degree-of-freedom of a ship model simulates a passive seakeeping experimental device to do a seakeeping experiment of a six-degree-of-freedom ship model motion state, the seakeeping experiment correspondingly includes pitching, rolling,heaving, yawing, surging and swaying, and through the measurement modes, a six-dimensional hydrodynamic coefficient matrix is obtained; and hydrodynamic coefficients of the ship model, such as additional mass and drag coefficients during ship model motion, are analyzed and calculated to further predict the motion of a ship in waves. According to the forced six-degree-of-freedom motion instrument,the sinusoidal linear velocity is generated through an eccentric wheel, thus the contact strength and the motion stability of a mechanism are increased; and the six-degree-of-freedom motion instrumenthas the advantages of a compact and reasonable structure, convenient operation, high test efficiency, comprehensiveness, economical efficiency and the like, and the application prospects are wide.
Description
technical field [0001] The invention belongs to the technical field of hydrodynamic experiments of ship model pools, and in particular relates to a forced six-degree-of-freedom motion instrument. Background technique [0002] The ship sails in the waves, and under the action of the waves, it produces unsteady motions such as yaw and pitch. Severe swaying will reduce the speed of the ship, cause cargo damage, damage the hull and machinery, make passengers seasick, affect the life and work of the crew, etc., study the hydrodynamic coefficient of the ship, analyze and calculate the additional mass and damping coefficient of the ship, and further predict the ship's performance in waves Sports situation. [0003] There are mainly two methods to obtain the hydrodynamic coefficient of the ship. One is the free attenuation test of ship model swaying, but the experimental results can only obtain the additional mass and damping of the ship at the resonance frequency, lacking frequenc...
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Inventor 赵大刚李元弟张佐天林健峰林洪志钟祥海汪瑜玮
Owner HARBIN ENG UNIV