SU1244010A2 - Arrangement for simulating ship rolling and pitching motions - Google Patents

Description

The invention relates to shipbuilding, in particular to the design and research of equipment and mechanisms operating in the pitching and pitching conditions of a ship, and is additional to the author. St. No. 1150149.

The purpose of the invention is to improve the quality of the simulation of pitching.

FIG. 1 shows a stand for modeling the ship’s side and pitching, general view; in fig. 2 - the same view in Ylan; in fig. 3 - position (conditionally) of the parts of the center when the balancer deviates by the angle ai, where aa.a.: lks; in fig. 4 is the same, when the deviation of the balance is at an angle a, where ac.1x; in fig. 5 - the same, when the balancer deviates by the angle amakr; in fig. b - stand for modeling pitching only, opening; 1; d.

Step. To simulate the side and pitching of the vessel (Figs. 1 and 2), the balance bar 2 is mounted movably on racks I, fixed with an axis 3, the ends of which are installed in the bottom 4 of the racks 1. On one of the balance bar 2 arms drive 5 and counterweight 6. The axis 3 is rigidly connected to the balance bar 2 by a solid body 8 by an axle 7. The drive 5 contains an electric motor 9, on the shaft of which a propeller 10 is fixed. The struts 1 are connected to the foundation by means of anchor flanges. On the shoulder of the balancer 2 with the ability to rotate 1, the object under study 12 is fixed.} 1a the rack 1 is fixed to the axis 13. The lever with the length of 14 is pivotally fixed with the possibility of rotation at one end on the object 12, and on the axis 13.

Simulation of the onboard and pitching of the vessel is carried out as follows.

Before testing, when the balancer is in gyu. when static equilibrium is investigated, object 12 being examined at / is given the maximum angle Kficiia p-j.n-., which is necessary to obtain the IS process. model, select the axis. paraximeter; pJHY angle of the balance bar 2 from the position of static equilibrium a. The axis 13 is fixed on the rack 1 in position according to the length corresponding to the length of the lever 14, determined according to the data pMi K. m a -.mk. The electric motor 9 of the actuator 5 is turned on, while the napelle) 10 rotates clockwise and creates a driving force, the flare of the sound |, the balance bar 2. the test object 12 and the solid body 8 against the clock around the axis 3, while balancing ) does not deviate at some angle O; x; - a.;. n: ... At this point, the object 12 under the influence of a lever

s

0

five

0

0

five

0

14 comes to a position with a roll angle of 0; p | Srmaks (Fig. 3). After that, the electric motor 9 of the drive 5 is switched, and the propeller 10 starts to rotate counterclockwise. The propeller 10 creates a driving force deflecting the balance bar 2, the object 12 and the solid body 8 counterclockwise until the balance bar is deflected at an angle K1; cc2 amax. This is due to the additional effect of the inertial forces of the solid body 8. At this moment, under the influence of the lever 14, the test object 12 is tilted at an angle Pi (Fig. 4). Next, the electric motor 9 of the actuator 5 is switched again, while the propeller 10 is again rotated clockwise. Under the action of the same forces, the balancer 2 deviates to the other side. Such switching of the actuator 5 takes place until the balancer 2 deviates in its extreme positions by a predetermined angle a.v.aiic, at which the roll angle of the studied 12 j6 0 (Fig. 5). At this moment, the drive 5 is disconnected and the swinging movement of the balancer 2 proceeds further due to the inertial forces of the hard body 8, while the swinging movement of the balance weight 2 becomes damped due to the action of the friction forces in the joints and the friction forces against the air. When the deflection angle of the balancer 2 is reduced to the value of amax, yes, where the Forest is a permissible predetermined amount of attenuation of the swinging movement of the balancer I, the drive 5 is switched on again and the balancer 2 is swayed.

With such a swinging movement of the balancer 2, the displacement of the object 12 under study is a combination of two movements in space: the explored object 1, and the object 12 performs a reciprocal change in the vertical direction, which corresponds to the displacement the vessel is in a nile pitching wave, and the object under study 12 1 periodically deviates from the vertical by an angle P "ax, which corresponds to the effect of the side rolling. Moreover, the heel angle of the object 12 under study becomes maximal. When the balance bar 2 passes the static equilibrium position and equals zero when the balance bar 2 deviates by the angle max, which corresponds to the effect of side and pitching on the vessel in actual conditions.

So that in the course of the rolling process, the object under study 12 could deviate to another maximum angle from the vertical, measure the length of the lever 14 and move the axis 13 to the corresponding position on the rack 1.

When simulating only the pitching, the axis 13 is installed; 1 is mounted on the upright 1 in the vertical; 1 plane, the passage by the 1st axis through the axis 3.

12

74-,

li

L /

/// V ///////// Л // фие.5

// L /////// 7 // and /// i /./ 77

FIG. 6

Claims (3)

1. STAND FOR MODELING THE STANDING AND KEELING PUMP SHIP by avt. St. No. 1150149, characterized in that, in order to improve the quality of pitching modeling, it is made with a lever fixed at one end with the possibility of rotation on the axis, which is equipped with one of the racks, while the other end of the lever and the shoulder of the balancer are made with the possibility of hinging on them the investigated object. 2. Stand by π. 1, characterized in that the lever is made with an adjustable length. 3. Stand by π. 1, characterized in that the axis is mounted with the possibility of movement relative to the rack. SU ..... 1244010