Intended learning outcomes: Present the elements of time management. Explain in detail knowledge on buffers and queues. Disclose scheduling of orders and scheduling algorithms. Describe splitting and overlapping.
Planning & control in organizational logistics aims to deliver products and orders reliably by the specified due date. Time management and scheduling are first and foremost a matter of medium-term and short-term planning (during order release), although there are some long-term elements. Figure 13.0.0.1 shows the reference model for business processes and the tasks of planning & control introduced in Figure 5.1.4.2, highlighting the tasks and processes in time management and scheduling on a darker background.
Fig. 13.0.0.1 The part systems examined in this chapter are shown on a darker background.
For an overview of the material in this chapter, see also Sections 1.2.3, 5.3.3, and 5.3.4. We suggest that you reread these sections before studying Chapters 13 through 15.
The first step in time management and scheduling is to estimate the lead time for an order. This chapter views and analyzes lead time as a composite of time elements. We will pay particular attention to unproductive interoperation times and examine difficult-to-estimate wait times for work centers statistically. From the results, we will derive means to reduce wait times. This chapter also presents various scheduling techniques and their areas of application — specifically, forward, backward, central point, and probable scheduling — and discusses effects such as splitting and overlapping.
Course 13: Sections and their intended learning outcomes
Course 13 – Time Management and Scheduling
Intended learning outcomes: Present the elements of time management. Explain in detail knowledge on buffers and queues. Disclose scheduling of orders and scheduling algorithms. Describe splitting and overlapping.
13.1 Elements of Time Management
Intended learning outcomes: Describe the order of the operations of a production order, operation time and operation load, the elements of interoperation time, administrative time, and transportation time.
13.2 Logistic Buffers and Logistic Queues
Intended learning outcomes: Explain wait time, buffers, the funnel model, and queues as an effect of random load fluctuations. Present conclusions for job shop production. Produce an overview on logistic operating curves.
13.3 Scheduling of Orders and Scheduling Algorithms
Intended learning outcomes: Describe the manufacturing calendar and the calculation of the manufacturing lead time. Differentiate between Backward Scheduling and Forward Scheduling. Explain network planning, central point scheduling, the lead-time stretching factor, and probable scheduling. Present scheduling of process trains.
13.4 Order Splitting, Order Overlapping, and Extended Scheduling Algorithms
Intended learning outcomes: Explain order or lot splitting, and overlapping. Present an extended formula for manufacturing lead time and extended scheduling algorithms.
13.5 Summary
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13.6 Keywords
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13.7 Scenarios and Exercises
Intended learning outcomes: Assess queues as an effect of random load fluctuations. Calculate examples for network planning, backward scheduling, forward scheduling, the lead-time stretching factor, and probable scheduling.
