MGMT 361: Gantt Charts
MGMT 361: Gantt Charts
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This 3 page Class Notes was uploaded by Emily McIlhattan on Wednesday February 18, 2015. The Class Notes belongs to a course at a university taught by a professor in Fall. Since its upload, it has received 418 views.
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Date Created: 02/18/15
WMEMT Egz Lecture Run Time Parameters and Gantt Chart Current Lecture Run Time Parameters and Gantt Charts IV RT Parameters matching supply with demand a Continue with Subway example i Typically there are about 150 customers ordering subs during lunch hours 11301pm each customer s orders 1 sub 1 Demand rate 150 subs15 hours 100 subshr how many customers will arrive in one hour 2 Bottleneck is 120 subshr so that s greater than 100 subshrl it is good enough but you wont want to produce more than what the customers want or else you are wasting resources 3 Other situation customer demand is 150 subshr it is greater than 120 subshr so you are no longer good enough ii When the demand rate is greater than the process capacity you are not good enough Customer demand size a Two types i Supplyconstraint not enough capacity to meet demand Flow rate will be equal process capacity ii Demandconstraint more than what the customer needs ow rate will equal demand rate Flow rate throughput smaller of process capacity and demand rate how many products will ow through the entire process a Actual Cycle time 1 ow rate take demand side into account b in previous lectures designed process cycle time and designed stage cycle time does not take the demand side into account Utilization measures how busy each stage is a Stage utilization ow ratestage capacity b Process utilization ow rateprocess capacity largest number among the utilization of each stage bottleneck stage utilization busiest person i Utilization can never be more than 100 Process Parameters a Design Parameters indicate what a process can achieve i Capacity maximum number of units the process can produce in a given time ii Design Cycle Time 1process capacity b Run Time Parameters indicate the current process performance under a speci c customer arrivaldemand schedule i These values change with demand 1 Flow rate throughput rate 2 Actual Cycle Time 1 ow rate 3 Process Utilization ow rateprocess capacity 4 Average WIP Average number ofjobs in the process VI Gantt Chart a Draw grid leftvertical axis resource name horizontal time b Also need to know customer arrival time Lecture 2 Outline I Gantt Chart ll Flow Time Ill Little39s Formula Current Lecture I Gantt Chart a Chipotle Example Cont d i Actual CT measures average interdeparture time how long does it take between two customers leaving the system ii Flow rate average departure rate measures number of customers can go through this process at a given time iii Utilization measures how busy the resource is ll Flow Time FT average time to go through the entire process on average how long the customer spends in the system i Also called quotaverage throughput timequot ii Depends on the arrival schedule run time parameters iii May contain waiting time time spent in buffer Ill WIP work in process on average how many customer M1 M2 or M3 is serving at any given time i First look for repeating pattern M1 working 50 sec80 sec and idle for the other 30 IV Little39s Formula when demand is less than or equal to process capac y a WlP Flow Time Actual cycle time i WIP Flow Time Flow Rate
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