Page 63 - Practical Design Ships and Floating Structures

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its duty. A detail tech-economic analysis has been taken to the transportation system of iron ore. Then a
new kind of shipping system has been put forward to solving the problems such as high producing cost,
environment pollution, etc. That is the river-sea-going ore barge fleet system. The key point of the
system is to develop a new kind of barge which can be used to form a large inland water pusher barge
fleet and is suitable for navigating at sea. A typical pusher barge fleet at sea is selected for full scale
test to examine the possibility of using this barge fleet to consist a large freshwater pusher barge fleet.
The reforming has been taken to the barge according to the full scale experiment and a model test has
then been carried out to check the effects of the reforming. The research achievement has been applied
to the renovations of existing integrated barge, and the operating of the system has proved its success.

2 FULL SCALE TEST AND ANALYSIS

The full scale test consisted of two parts. The first part was carried out on the sea, where the sea barge
was pushed by the sea pusher. The second part was canied out on the river, where the sea barge was
pushed as one of a part of large fleet by the river pusher. The ships concerned with test are listed in
table 1. In order to test performance for different forms of fleet and reduce impact to the production
plan, the form of fleet was altered in the test. The hybrid forms are listed in table 2.
The item of test includes fleet speed to the water, fleet speed to the bank, mooring force, manoeuvering
test, operating test, etc. The equipment that used for the test includes KGP-912 navigating GPS,
LS25-3 velocity-type flowmeter, marine radar,CK08 Sensor, UCOM-8L strain-gauge, C12 gyroscope,
CK06 rudder sensor, SC - 16 oscillograph etc.

3 ANALYSIS OF TEST RESULTS

The river-sea-going barge in the test was typical barge for pusher-barge-line of marine route, where
there is a large groove in the stem of the barge to install the pushing frame. That caused rough vortices
behind stern of the barge. As we know, for large fleet, the formation of the barge is more important
than the unit barge as velocity as concerned. The ideal formation for large fleet is so-called integrated
tug-barge system. To pusher- barge fleet on the sea, the aft part of the barge and the fore part of the tug
must transit smoothly so as to keep lower resistance. From resistance and propulsion point of view, the
hybrid fleet on the river mute is not ideal. Table 3 shows the working status of main engine on the river
route.

TABLE 1
SHIP FOR FULL SCALE TEST
21075
F83002
Ship name F83005 21264 21078 41013 1006 22019
Shiptype I Barge 1 I Barge I L11YO I Barge I Pusher Pusher
.It ,no
I
Barge
(sea) (river) (river) (river) (sea) (river)