Analysis of a Mixed Model Assembly Line

Pages: 15 (2952 words) Published: April 27, 2011
Summary
The following text outlines the design and analysis of a mixed model assembly line and discusses the various effects of different line layouts.

This text will also cover the diferances between two selected work flow processes and discuss the various effects randomness and variation have in a flow process.
table of figures

|Figure 1.0 |Precedence Diagram | |5 | |Figure 1.1 |Incomplete Composite Model | |6 | |Figure 1.2 |Positional Weight Matrix | |7 | |Figure 1.3 |Complete Composite Model | |8 | |Figure 1.4 |Workstation Layout Normal Output | |10 | |Figure 1.5 |Assembly Line Balancing Normal Production | |11 | |Figure 1.6 |Composite Model 15% Increased Production | |11 | |Figure 1.7 |Workstation Layout 15% Increased Output | |13 | |Figure 1.8 |Assembly Line Balancing 15% Increased Output | |14 | |Figure 1.9 |Composite Model 15% Decreased Production | |15 | |Figure 2.0 |Workstation Layout 15% Decreased Output | |16 | |Figure 2.1 |Single & Parallel Line Flow | |17 | |Figure 2.2 |Straight Line Flow & ‘U Shaped Flow Systems | |20 | | | | | |

introduction

The following information demonstrates an understanding of scheduling techniques used in relation to mixed model assembly lines. Using a certain Heuristics Approach, an assembly line will be designed and balanced in a way of achieving maximum productivity. The text will also demonstrate the effects on efficiency when there are changes to product output.

To follow, there will also be discussions concerning the following subjects: • Production lines
• Process flow
• Randomness in task processing times
• Causes of variation in processing times.

Design of A Mixed Model Assembly Line

RPWT Heuristics Approach
A heuristic (problem solving technique using readily accessible information) approach can be applied to the mixed model where an assembly line can be produced. In this approach, tasks are prioritised and based on the increasing sum of their processing times. “The sum is called the ‘positional weight’ of the task, and the tasks with higher positional weights are assigned first. Tasks are assigned to the current open workstation if permitted by their processing time[i].”

This approach differs from common line balancing techniques due to the fact that this approach operates using a mixed model.

Below is the data provided for this task to produce the mixed model assembly line.

|Element |Element Time (Mins) |Preceding Elements | |A |6 |- | |B |1 |A | |C |1...