Scheduling Lean Manufacturing Systems at TU München

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Study with flashcards and summaries for the course Scheduling Lean Manufacturing Systems at the TU München

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Example for a Heuristic Method?

Exemplary flashcards for Scheduling Lean Manufacturing Systems at the TU München on StudySmarter:

Which different models are there considering the machine configurations?

Exemplary flashcards for Scheduling Lean Manufacturing Systems at the TU München on StudySmarter:

What are the objectives of the flexible flow line loading (FFLL) algorithm?

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What performance measures are there?

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What are just-in-time oriented approaches?

Exemplary flashcards for Scheduling Lean Manufacturing Systems at the TU München on StudySmarter:

What is car sequencing?

Exemplary flashcards for Scheduling Lean Manufacturing Systems at the TU München on StudySmarter:

What is mixed-model sequencing and what are its assumptions?

Exemplary flashcards for Scheduling Lean Manufacturing Systems at the TU München on StudySmarter:

What are work oriented approaches?

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What are the objectives of the grouping and spacing (GS) heuristic?

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What is done in the second phase of the FFLL?

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What is done in the first phase of the FFLL?

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What are the three phases of the flexible flow line loading (FFLL) algorithm?

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Exemplary flashcards for Scheduling Lean Manufacturing Systems at the TU München on StudySmarter:

Scheduling Lean Manufacturing Systems

Example for a Heuristic Method?
Dispatching/priority rules

Scheduling Lean Manufacturing Systems

Which different models are there considering the machine configurations?
single machine models
parallel machine models
flow shop models
job shop models
supply chain models

Scheduling Lean Manufacturing Systems

What are the objectives of the flexible flow line loading (FFLL) algorithm?
– maximize throughput (minimize makespan)
– minimize WIP (reduce blocking probabilities)

Scheduling Lean Manufacturing Systems

What performance measures are there?
Throughput (and Makespan)
Due dates:
– Lateness (positive and negative)
– Tardiness (positive/late only)
Costs:
– Setup Costs
– WIP, Inventory Costs
– Finished Goods Inventory Costs
– Transportation Costs

Scheduling Lean Manufacturing Systems

What are just-in-time oriented approaches?
from TPS
– avoid waste
– reduce inventory as much as possible

material supply according to JIT principle

Scheduling Lean Manufacturing Systems

What is car sequencing?
– aim to find a sequence that minimizes number of rule violations
– requires sequencing rules (Ho:No)
– sliding through the sequence and summing up violations of relevant sub-sequences
– violation occurs if a window of size No contains more than Ho cars containing option o

Scheduling Lean Manufacturing Systems

What is mixed-model sequencing and what are its assumptions?
– aim to minimize total work overload based on a detailed schedule
Assumptions:
– closed stations
– velocity of conveyor belt = 1
– operators return with infinite velocity to next workpiece
– work overload is measured by the time or space necessary to complete all work in excess of the respective stations right border
– work overload has no impact on the succeeding station

Scheduling Lean Manufacturing Systems

What are work oriented approaches?
– aim to minimize work overload
– work overload occurs when operations cannot be finished within stations boundaries

Scheduling Lean Manufacturing Systems

What are the objectives of the grouping and spacing (GS) heuristic?
– minimize total setup cost
– minimize total weighted tardiness
– spacing of capacity constrained operations
– keep a regular rate for material consumption

Scheduling Lean Manufacturing Systems

What is done in the second phase of the FFLL?
– determine the order of jobs
– calculate overloads
– calculate cumulative overloads
– select job with the smallest sum of (positive) overloads and add to the sequence
– repeat

Scheduling Lean Manufacturing Systems

What is done in the first phase of the FFLL?
each job is assigned to a machine
workloads are balanced by using the longest processing time (LPT) heuristic:
– assume all jobs are available at the same time
– sort jobs in decreasing order of their processing times
– whenever one of the machines is freed, select jobs with LPT

Scheduling Lean Manufacturing Systems

What are the three phases of the flexible flow line loading (FFLL) algorithm?
1. machine allocation
2. sequencing
3. release timing

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