Mm a 145 Zigzag Assignment

8/13/2019 Mm a 145 Zigzag Assignment

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MMA145 Ship motion and waveinduced loads

Assignment:

10-10 Zig-Zag test in Bridge simulator

Note that the assignment is mandatory for the examination of thecourse

February 10, 2010

Carl-Erik Janson

Name:_____________________________________________

Name:_____________________________________________

Name: _____________________________________________

Name: _____________________________________________

Md. Mohibul Alam Maruf ([email protected])

Huseyin Saglam ([email protected])

Md. Asadussaman Sarder ([email protected])

Zayar Thein ([email protected])

(February 19, 2010)


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General description of the assignment

Purpose

There are three main purposes

1. To have some experience of the working environment on a modern bridge.2. To carry out a 10-10 Zig-Zag test (one of the IMO criteria)3. To compare the test results to the IMO criteria

General information

The assignment will be carried out in the Bridge simulator at the department of Shipping andmarine technology. It is recommended to work in groups of 4 students having the followingroles:

Captain: In charge of test schedule, gives order to change rudder position

1st officer: Keep track of course and report when course is 10 deg. Starboard, 10 deg. Port,original course and when the maximum overshoot angle is reached. Take noteon overshoot angle.

2nd officer: Keep time record on all events

Helmsman: Control the rudder and report when rudder is in position

Ship to be tested

Name: Fure West

Loa : 144 m

B: 21 m

T: 9.1 m

Speed: 14.5 knots

Shallow water depth: __________

Test 1 (Container Vessel)LOA: 347.0 mBeam: 42.8 mDraught: 10.5 mDwt: 112710.0 M/TSea Speed: 22.6 knotsWater depth: 14.0 m (Shallow)

Test 2 (Tanker Vessel)LOA: 250.0 mBeam: 45.0 mDraught: 12.8 mDwt: 114576.0 M/TSea Speed: 15.3 knotsNo Shallow water test was carriedout for this vessel.

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Example of a 20-10 Zig-Zag test

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Test schedule for deep water

Event Who give order or report Time record2nd Officer

Start

Rudder 10 deg. to starboard Captain 0Rudder in position HelmsmanCourse 10 deg starboard 1 st OfficerRudder 10 deg. to port CaptainRudder in position HelmsmanMax overshoot angle 1 st Officer Course:

Course 10 deg. starboard 1st

OfficerOriginal course 1 st OfficerCourse 10 deg. to port 1 st OfficerRudder 10 deg to starboard CaptainRudder in position HelmsmanMax overshoot angle 1 st Officer Course:Course 10 deg. to port 1 st OfficerOriginal course 1 st OfficerCourse 10 deg. to starboard 1 st OfficerRudder 10 deg. to port CaptainRudder in position HelmsmanMax overshoot angle 1 st Officer Course:Course 10 deg. to starboard 1 st OfficerOriginal course 1 st OfficerCourse 10 deg. to port 1 st OfficerRudder 10 deg. to starboard Captain...

Ship'sHeading

000.0

Test Ship: Container Vessel

010.0

019.4

350.0

331.5

000047

000137

000241

000259Test Completed

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Test schedule for shallow water


Start

Rudder 10 deg. to starboard Captain 0Rudder in position HelmsmanCourse 10 deg starboard 1 st OfficerRudder 10 deg. to port CaptainRudder in position HelmsmanMax overshoot angle 1 st Officer Course:Course 10 deg. starboard 1 st OfficerOriginal course 1 st OfficerCourse 10 deg. to port 1 st OfficerRudder 10 deg to starboard CaptainRudder in position HelmsmanMax overshoot angle 1 st Officer Course:Course 10 deg. to port 1 st OfficerOriginal course 1 st OfficerCourse 10 deg. to starboard 1 st Officer

Rudder 10 deg. to port CaptainRudder in position HelmsmanMax overshoot angle 1 st Officer Course:Course 10 deg. to starboard 1 st OfficerOriginal course 1 st OfficerCourse 10 deg. to port 1 st OfficerRudder 10 deg. to starboard Captain...

Test Ship: Container Vessel

Ship'sHeading

000.0

010.0

014.4

350.0

342.1

000140

000235

000520

000636Test completed

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Test schedule for deep water


Start

Rudder 10 deg. to starboard Captain 0Rudder in position HelmsmanCourse 10 deg starboard 1 st OfficerRudder 10 deg. to port CaptainRudder in position HelmsmanMax overshoot angle 1 st Officer Course:

Course 10 deg. starboard 1st

OfficerOriginal course 1 st OfficerCourse 10 deg. to port 1 st OfficerRudder 10 deg to starboard CaptainRudder in position HelmsmanMax overshoot angle 1 st Officer Course:Course 10 deg. to port 1 st OfficerOriginal course 1 st OfficerCourse 10 deg. to starboard 1 st OfficerRudder 10 deg. to port CaptainRudder in position HelmsmanMax overshoot angle 1 st Officer Course:Course 10 deg. to starboard 1 st OfficerOriginal course 1 st OfficerCourse 10 deg. to port 1 st OfficerRudder 10 deg. to starboard Captain...

Test Ship: Tanker Vessel

Ship'sHeading

000.0

010.0

018.1

350.0

337.8

000053

000133

000330

000457Test completed

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2nd Overshoot Angle

0

5

10

15

20

25

30

35

40

0 5 10 15 20 25 30 35 40

Length/Speed (Secs)

Overshoot

Angle(Degrees)

1st Overshoot Angle

0

5

10

15

20

25

0 5 10 15 20 25 30 35 40

Length/Speed (Secs)

OvershootAngle

(Degrees) A

B

C A-Container shipin deep water

B-Container shipin shallow water

C-Tanker vesselin deep water

D

E

FD-Container ship

in deep waterE-Container ship

in shallow waterF-Tanker vessel

in deep water

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Maruf, Saglam, Sarder, and Thein Page 8

Overview

10-10 Zig-Zag tests were performed on a container vessel navigating in both deep water and shallowand on a tanker vessel operating in deep water. The tests were carried out in a bridge simulator ofChalmers University of Technology. Overshoot angles recorded from the tests are listed in table 1along with IMO requirements. Rudder angles and course angles are also plotted against time andshown in figure 1 to 3. Test data are detailed in table A-1.

Table 1: 10-10 Zig-Zag Test Overshoot Angles

Vessel Water OvershootTest

Speed

(m/s)

Length/speed

(s)

Vessel sOvershoot

Angle

(deg)

IMOAllowableOvershoot

Angle(deg)

IMOcriteria

Container Deep First 11.63 29.8 9.4 19.9 PassedContainer Deep Second 11.63 29.8 12.2 34.8 Passed

Container Shallow First 11.63* 29.8 4.4 19.9 PassedContainer Shallow Second 11.63* 29.8 7.9 34.8 PassedTanker Deep First 7.88 31.7 8.1 20.0 PassedTanker Deep Second 7.88 31.7 12.2 35.0 Passed*Actual operating speed was 9.52 m/s.

Figure 1: 347 meter length container vessel 10-10 zig-zag test in shallow water. Ship speed is 18.5knots. (22.6 knots sea speed). Under-keel clearance is 3.5meter.

0 50 100 150 200 250 300 350 400-15

-10

-5

0

5

10

15

20

Time,t(sec)

H e a

d i n g

( d e g

)

Ship's headingRudder position


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Maruf, Saglam, Sarder, and Thein Page 9

Figure 2: 347 meter length container vessel 10-10 zig-zag test in deep water. Ship speed is 22.6 knots

Figure 3: 250 meter length tanker vessel 10-10 zig-zag test in deep water. Ship speed is 15.3 knots

Summary

Since overshoot angles of the test vessels are smaller than the IMO allowable angles, both ships meetthe maneuvering criteria set by IMO. The tests confirm that the more slender and faster vessel has agreater turning rate, and hence better maneuvering ability.

0 20 40 60 80 100 120 140 160 180-20

-15

-10

-5

0

5

10

15

20

25

30

Time,t(sec)

H e a

d i n g

( d e g

)


0 50 100 150 200 250 300-20

-15

-10

-5

0

5

10

15

20

25

Time,t(sec)

H e a

d i n g

( d e g

)



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Maruf, Saglam, Sarder, and Thein Appendix-A

Table A-1 Test Data Sheet (Tested in Bridge Simulator 2 at Chalmers University of Technology)

Test Type Events Heading(deg) Time(hh:mm:ss)Container deep water start 000.0 12:00:42

10deg stb 010.0 12:01:29Max overshoot1 019.4 12:02:1910deg port 350.0 12:03:23Max overshoot2 331.5 12:03:41

Tanker deep water start 000.0 12:00:4510deg stb 010.0 12:01:38Max overshoot1 018.1 12:02:1810deg port 350.0 12:04:15Max overshoot2 337.8 12:05:42

Container shallow water start 000.0 12:00:23

10deg stb 010.0 12:02:03Max overshoot1 014.4 12:02:5810deg port 350.0 12:05:43Max overshoot2 342.1 12:06:59

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Mm a 145 Zigzag Assignment