Chat with us, powered by LiveChat Questions about Operations Research Models | Coms Paper
+1(978)310-4246 credencewriters@gmail.com
  

See the Questions in the attached file,Answer with details,use Excel and draw Chart.Instructions:
1. Make sure to include any analysis, tables, spreadsheets as part of your report.
2. Make sure to provide any reference when you cite work performed and/or published
by others.
1
The Washington Metropolitan Area Transit Authority (WMATA) is the transportation
infrastructure serving the DMV area providing rapid transit, fixed-route bus, and paratransit
services. WMATA has hired you to identify opportunities to optimize the transportation assets
operation and maintenance activities and assigned you two (2) specific task orders.
Task Order #1: Inventory policy optimization for bus and paratransit services maintenance
activities.
Vehicle’s Fleets Information
I.
WMATA has the following preventive maintenance (PM) schedule:
II.
Fleet
model
Units
Model-A
Model-B
Model-C
100
85
50
Fleet
model
Units
Model-A
Model-B
50
50
Oil per
service
(gallons)
12
10
18
Fixed-route buses fleet
Standard time
Service
per service
frequency
(hrs.)
Monthly
1.5
Bi-monthly
2
Monthly
1
Cost per service
(USD)
(L+M+OH)
$125
$100
$105
Oil per
service
(gallons)
5
5
Paratransit buses fleet
Standard time
Service
per service
frequency
(hrs.)
Bi-monthly
1
Bi-monthly
0.75
Cost per service
(USD)
(L+M+OH)
$25
$18
Support Facilities Information
1. Maintenance Facilities
• WMATA’s maintenance facilities has capacity to serve 50 units per day.
2. Supply Chain Process and Warehouse Facilities Information
• WMATA’s has allocated space in the warehouse to store 1-month worth of inventory.
• WMATA buys the oil in bulk at $3 per gallon discounted to $2.75 per gallon if the order
quantity is more than 3000 gallons.
• WMATA has a storage cost of $0.025 per gallon per day.
• The transactional cost (i.e., placing the order) is $75 per order and 3-day lead time.
WMATA wants to explore shorter lead time.
III.
Analysis outcome:
• Determine the optimal inventory policy
• Submit recommendations to WMATA
o Document and present underlying assumptions (if any) used to conduct your
analysis and to present your recommendation
2
Task Order #2: Overhaul and Inspection Processes Cost Reduction
WMATA has three (3) main rail yards in three jurisdictions, DC, MD and VA, where specialized
overhaul is performed to the train cars. After the overhaul, the train cars need to go to one of the
two (2) inspection centers in MD or VA where train cars must go for detailed inspection before
they are in service again. The quarterly capacities for the rail yards are 120, 150, and 120, and the
demands at the two inspection centers are 230 and 140 train cars.
Table 1. Mileage Chart
MD
VA
DC
MD
VA
10
5
12
20
15
8
Table 2. Transportation Cost per
Car
MD
VA
DC
MD
VA
$800
$500
$550
$1,000
$1,250
$600
Analysis outcome:




Represent the process in a diagrammatic for using the transportation model with nodes and
arcs.
Represent the process using linear programming (LP), including the objective function and
constraints.
Present the optimal solution to WMATA.
Document and present underlying assumptions (if any) used to conduct your analysis and to
present your recommendations.
3

Purchase answer to see full
attachment

error: Content is protected !!