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针对集卡、堆场起吊设备和岸桥设备在集装箱船舶装卸作业时的规划问题提出了一个起吊设备-车辆的规划模型。模型对岸桥装载规划、堆场起吊设备路径选择和集卡分配进行了系统的优化,其优化目标是相关设备的空闲和堆场起吊设备空驶时间的最小化。针对模型提出一种改进的遗传算法,并根据其特性减少了搜索空间。实验表明,上述模型针对整个装载过程获得了系统模拟结果,其算法在允许的运算时间内能获得稳定的满意解。
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第46卷第3期
2006年5月
大连理工大学学报
Jo urnal of Dalian Unive rsity o f Te chno lo g y
Vol
.46,
No
.3
May
2006
文章编号: 1000-8608(2006)03-0372-08
Receiv ed by
:2004
-
12
-
15;
Revised by
: 2006
-
02
-
05.
S upported by
: N aturalScience Foundation of China (50578030).
Corresponding author
:
KANG Hai
-
gui
*
(1945-),
Male
,
Prof
.,
Supervisor of D oc
..
Research on programming of crane
-
vehicle scheduling
fo r lo ading containership
KANG
Ha i
-
gui
*
,
ZH OU
Pen g
-
fei
(
State Ke y Lab
.
of Coas tal and Offshore Eng
.,
Dalian U niv
.
of Technol
.,
Dalian
116024,
Chin a
)
A b stract
: A crane-vehicle scheduling m odel is suggested in a loading
container process w ith a fleet of vehicles, several yard-cran es and a
quay-crane. T he m odel is to plan quay-crane loading operation, to schedule
yard-crane routing and to dispatch vehicles to containers, so as to m inim ize th e
totally idle tim e o f th e related eq u ip m en t an d yard -cran e travel tim e. B ecause
of its hardness, a genetic algorithm is developed w ith a reduced solution set on
its p rop erty . N u m erical ex p erim en ts sh o w th at th e m od el p rov id es sy stem ic
sim ulation for the w hole load process, and the results of G A are stable and
acceptable in allow able C P U tim e.
Key w ords
: term inallogistics; transportation; program m ing m odel; container
0
Introduction
W ith the increasing container shipm ent,
container term inal logistics optim ization has
becom e an im portant issue for a container
term in al. G en erally its aim is th e rap id tu rn ov er
of containers, w hich corresponds to a reduction
of a port tim e of containerships and handling
cost.
B ecause inbound containers are usually
unloaded onto a designated open space and an
u nloaded container is located in an em pty space
n ext to the previously un loaded container in
term inal, the yard handling equipm ent does not
have to travel m uch longer during the unloading
operation. T hus, the unloading tim e can be
considered to be proportional to the num ber of
containers. In the case of loading, how ever, a
container to be loaded onto a slot in a ship m ust
m eet various constraints of slots, w hich are
requested by the shipping line. A lso, locations
of outb ound containers m ay be scattered
overawideareainayard.Thus,theloading
tim e highly depends on the loading sequence of
containers
[1 , 2]
. T he follow ing issues are
considered in this paper: W hat is the schedule of
q u ay -cran e load in g o p eration s; h o w sh ou ld
vehicles be dispatched to containers; how to
assign yard-cranes to yard-bays so as to
m inim ize the idle tim e of all equipm ent and the
travel tim e of all yard -cranes.
F u ll atten tion h as b een p aid to th e relativ e
containership loading issue. A m ath em atical
m o d el an d a related op tim izin g alg orith m are
suggested in R ef. [3] for loading sequence
scheduling by virtue of optim izing a transfer
crane. T h e m ain problem of the form ulation is
an excessive com putational tim e for a large
problem , thus a heuristic algorithm is suggested
andtestedinthepaper.Cao,
et al
[4]
proposed a
tab u search alg orith m to solve th e tran sp ortation
problem w ith nonlinear side constraints, just in
t h is w a y t o m in im iz e lo a d in g c o s ts . K im ,
et al
[5 ]
proposed a m ethodology to convert a current
order of export containers in the yard into a bay
layout. T he goal is to find the few est possible
num ber of containers and/or shortest possible
travel distance in order to m inim ize the total
turnaround tim e of a vessel in a port.
Hartmann
[6]
developed a general scheduling
m odelto assign resources to jobs and arrange the
job s w ith con sid eratio n o f con strain ts. A G A
b ased on priority rules for solving the prob lem is
discussed. R outing of straddle carriers for
loading exportcontainers is discussed in R ef.[7]
to m in im ize th e to tal travel distan ce o f strad dle
carriers in th e y ard . T h e rou tin g pro b lem is
com posed of container allocation problem —
form u lated as a tran sp ortation p rob lem — an d a
carrier ro u tin g p ro b lem w ith th e g iv en seq u en ce
o f y ard -b ay s to b e visited b y a carrier. In R ef.
[8], the num ber of containers picked up by a
straddle carrier at each bay and the sequence of
b ay visits is d eterm in ed to m in im ize to tal travel
distance/tim e of the carrier. T he proposed
in teger-program m ing m odel is solved by a
tw o-phase procedure. B ose,
et al
[9]
in v e s t ig a te d
different dispatching strategies for straddle
carriers to g an try cran es in ord er to redu ce
vessel′s turnaround tim e at port by m axim izing
productivity of gantry cranes achieved by an
efficient schedule of the given straddle carriers.
Bish,
et al
[10 ]
fo cu sed on th e N P -h ard
vehicle-schedu ling-location problem of assigning
a yard location to each im port container and
dispatching vehicles to containers in order to
m inim ize the totaltim e for unloading a vessel. A
heuristic algorithm based on an assignm ent
problem form ulation is presented. K im ,
et al
[11 ]
discussed the load-sequencing problem for
ex p o rt con tain ers in term in als w ith tran sfer
cranes and yard trucks. A flexible beam search
algorithm for m inim izing total handling tim e of
cranes and trucks is suggested. T he existing
m ethods and algorithm s are m ostly obtained by
optim izing the single process. B ut in order to
obtain an efficient loading planning in term inal,
it is n ecessary to p u t forw ard th e relativ e
problem s as a w hole. T herefore in the paper, a
system ic m odel is proposed for container loading
scheduling and a genetic algorithm is developed
to solve it.
1
Problem formulation
1
.
1
Problem description
T he contain er vessel loading process m ainly
involves in stow age planning, yard-crane and
quay-crane scheduling, yard vehicle planning. A
shipping line′s em ployee classifies loading
containers based on their attributes including
discharge ports and w eigh t-class of containers,
etc.. C ontainers w ith these attributes are
assigned to specific positions w ithin ships. B ased
on this instruction, a term inal planner then
assigns the dedicated containers identified by
num bers to respective slots. Q uay-crane split
(scheduling) is to assign quay-cranes to ships
and ship sections. M ode of loading vessels and
quay-crane split together result in a loading
sequence (show n in T ab .1), w hich sh ow s the
n um ber of contain ers and the sequence of
vessel-bay in w hich a quay-crane perform s the
loading operation on categories of containers.
T ab.1 A n exam ple of quay-crane loading sequence
S equ en ce of q u ay -crane C o n tainer category Q uantity
1A3
2B5
3C6
4B4
5A5
6D3
7E7
It is supposed in the paper that quay-crane
loading schedules are planned in advance and
outbound containers have been stored in specific
storage bays. T ake single quay-crane case for an
exam ple, in w hich loading schedule in T ab.1
373
第3期
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