CALCS PROC050ACCELERATIONS 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.

#### 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

 As Acceleration, at ship CG, suffixes x y z translational (m/s^2), rx ry rotational (rad/s^2) Au acceleration of unit (defined point) (m/s^2) cond operating condition Kg gravity conversion factor (s^2/m) sRx sRy acceleration direction factors (+1 or -1) Ui Unit, point i defined for local accelerations & shown on plot Xcg Ycg Zcg co-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_units Definition of unit locations unit_i unit\$ Xu Yu Zu Kg 1 Point1 31 15 24.7 1/g 2 Point2 57 -7.6 19.7 1/g TABLE_D_0

## PROJECT INPUT

 TABLE_D_1 T_Unit Accelerations at locations of units unit_i unit\$ Xu Yu Zu Kg 1 Rmin .3*100.45 22/2+8 9+24 1/g 2 Rmax .3*100.45 22/2+34 9+24 1/g TABLE_D_0

See PROC052