Optimization of container ship route and speed in Public health emergency environment

Figure 1.

Figure 2.

Figure 3.

Speed optimization and quarantine waiting time

Route	Original speed	Waiting time for quarantine	Optimized speed	Waiting time for quarantine
Route 1	13.68	9.5	8	6.3
Route 2	13.76	5.4	8.45	0

Overview of case analysis route

Route	Sailing route
Route 1	Incheon-Qingdao-Shanghai-HongKong-Singapore-Port Klang
Route 2	Incheon-Qingdao-Singapore-Port Klang

Port operation time and port disbursement account

Port	Time in port (days)	Port disbursement account ($)	If shore power installed	Shore power unit consumption (kWh / time)
Incheon	1.2	17729	NO	-
Qingdao	0.68	28325	YES	935.7
Shanghai	0.83	30126	YES	528.8
HongKong	0.98	18029	NO	-
Singapore	0.95	15028	NO	-
Port Klang	0.83	32444	NO	-

Optimization results at different distances

Serial number	Distance between two ports	Cost (no port skipping) ($)		Cost (port skipping)
	(nautical miles)	Cost (under original speed)	Cost (under optimized speed)	($)
Route 1	453.1	638279.27	622610.12	601010.02
Route 1	600	662413.06	646743.91	640705.93
Route 1	750	701848.12	686178.97	696031.52

Calculation results of operating costs under different loading and unloading volumes

Route	volume	Cost (no port skipping) ($)		Cost (port skipping)
		Cost (under original speed)	Cost (under optimized speed)	($)
Route 1	120	638279.27	622610.12	601010.02
Route 1	150	638279.27	622610.12	613010.02
Route 1	180	638279.27	622610.12	625010.02

Calculation results of operating costs under different fuel prices

Route	Price of fuel oil	Cost (no port skipping) ($)		Cost (port skipping)	The difference of cost under the condition of skipping Port & optimizing speed
	($/T)	Cost (under original speed)	Cost (under optimized speed)	($)
Route 1	510	587327.15	573916.17	550057.90	23858.27
Route 1	560	612803.21	598263.14	575533.96	22729.19
Route 1	610	638279.27	622610.12	601010.02	21600.10
Route 1	660	663755.33	646957.09	626486.07	20471.02
Route 1	710	689231.39	671304.07	651962.13	19341.94

Optimization results under different port quarantine period

Serial number	port quarantine period	Total voyage cost (no port skipping ($)		Total voyage cost (port skipping)	The difference of total cost under the condition of skipping Port & optimizing speed
	(day)	Cost (under original speed)	Cost (under optimized speed)	($)
Route 1	10	608941.03	595642.12	601010.02	-5367.90
Route 1	14	638279.27	622610.12	601010.02	21600.10
Route 1	18	667617.51	649578.12	601010.02	48568.10

Distances of route legs in nautical miles

Leg	Distance	Time (days)
Incheon-Qingdao	377.2	1.1
Qingdao-Shanghai	484.4	1.4
Shanghai-HongKong	877.9	2.7
HongKong-Singapore	1477.8	4.5
Singapore-Port Klang	453.1	1.4
Qingdao-Singapore	2840.1	8.6
Shanghai-Singapore	2355.7	7.2

Calculation results of operating costs as impacted by pandemic situation

Route	Cost (no port skipping) ($)		Cost (port skipping)
	Cost (under original speed)	Cost (under optimized speed)	($)
Route 1	638279.27	622610.12	601010.02
Route 2	546390.81	516092.57	539193.25

Cost calculation results of original voyage without pandemic situation

Route	Time (days)	Cost ($)
Route 1	16.57	568600.95
Route 2	14.76	506784.19