CALCS PROC050
ACCELERATIONS AT POINT DUE TO SHIP MOTIONS

CONTENTS

Guidance: Application, Input, Output & Theory
Notation
Input Data Format
PROJECT EXAMPLE

GUIDANCE

Use to determine accelerations at specified points (ex. locations on cranes, process plant, containers, etc) subject to ship motion inertial loading.
Coordinate system is X fwd, Y port & Z up (from LR).
General datum for ship dimensions is Ship Bottom (AB Above Bottom), Aft Perpendicular (AP) and Ship Centre Line (transverse).

APPLICATION

The procedure provides an estimate of accelerations, suitable for the design of structures, at defined points.
See also: BAS005, BAS021. Procedures PROC050 & PROC052 are used in combination.

INPUT TO PROCEDURE

OUTPUT FROM PROCEDURE

Translational and rotational accelerations at defined points.

THEORETICAL BASIS

See procedure. Motion centres are not precisely defined by closed form solutions because of variable parameters including motion, mass distribution, hull form & draft. The estimate used for the motion centre is the ship centre of gravity. Centrepetal accelerations are not included.

NOTATION

AsAcceleration, at ship CG, suffixes x y z translational (m/s^2), rx ry rotational (rad/s^2)
Auacceleration of unit (defined point) (m/s^2)
condoperating condition
Kggravity conversion factor (s^2/m)
sRx sRyacceleration direction factors (+1 or -1)
Ui Unit, point i defined for local accelerations & shown on plot
Xcg Ycg Zcgco-ordinates of ship CG (m)
Xu Yu Zu coordinates of unit (defined point) (m)

INPUT DATA FORMAT

The following input does not define all the data required to run the procedure. The remainder is input by PROC052.

TABLE_D_1
T_unitsDefinition of unit locations
unit_iunit$XuYuZuKg
1Point1311524.71/g
2Point257-7.619.71/g
TABLE_D_0

PROJECT INPUT

TABLE_D_1
T_UnitAccelerations at locations of units
unit_iunit$XuYuZuKg
1Rmin.3*100.4522/2+89+241/g
2Rmax.3*100.4522/2+349+241/g
TABLE_D_0

PROJECT OUTPUT

See PROC052

PROJECT END