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SHIP ICE ACCRETION (SHIP ICE)
SOUND FOCUS (SOCUS)

Aerographers Mate 1 & C
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intended  route,  or  determining  how  frequently  the .  Wind  speed  is  entered  in  whole  knots.  The superstructure  ice  should  be  cleared. algorithm  considers  winds  from  22  to  71  kt  by  the LIMITATIONS AND ASSUMPTIONS The restrictions as well as for granted in using the SHIP follows: following   categories: — Beaufort Force 6 and 7 (winds 22 to 33 kt) — Beaufort  Force  8 (winds 34 to 40 kt) the principles taken — Beaufort Force 9 and 10 (winds 41 to 56 kt) ICE program are as .  The  methods  described  here  are  best  applied  to smaller  ships.  Ship’s  characteristics,  such  as  freeboard, waterline  length,  hull  response,  and  ship’s  course  and speed  are  not  considered. .  Information  relating  to  ice  accretion  thresholds is  not  available  and  must  be  developed  independently by each user. .  Air  temperature  is  entered  in  whole  degrees (Celsius).  For  temperatures  <-21°C,  the  SHIP  ICE model  assumes  a  constant  accretion  rate  based  on -21°C.  The  algorithm  considers  temperatures  from -2°C  to  -21°C. .  Sea  temperature  is  entered  in  whole  degrees Celsius. The algorithm considers temperatures from —       Beaufort   Force 11 and 12 (winds 57 to 71 kt) l If the air temperature is  *2°C, then the ice accretion is considered to be 0. . If the wind is <22 kt (BF 6) and the temperature is <-2°C, then the ice accretion is considered to be 1.5 cm per day. FUNCTIONAL  DESCRIPTION The SHIP ICE program determines the ice accretion rates from look-up tables based on the wind category. For each category, there is an ice accretion matrix with an  accretion  rate  for  each  combination  of  air-sea temperature (where the air temperatures are between -2°C   and   -21°C,   and   sea   temperatures   between 10 and -2°C.) Figure 7-5 shows an example of a SHIP 10°C to -2°C. ICE  ACCRETION  program. Figure 7-5.-Examp1e output of the SHIP ICE program. 7-13







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