M32064 - Manufacturing System Design - Critical Awareness of Sustainable Manufacturing Systems - Management Assignment Help

Assignment Task :

Aims of this work

1. To develop a systematic understanding and critical awareness of sustainable manufacturing systems, system design approaches and planning techniques applied to industry.

2. To enhance the acquisition of analytical knowledge and practical skills gained for analysing a complex manufacturing process or system and their integration using advanced computer design and modelling simulation tools.

3. To explore modelling simulation techniques to help create rapidly and turn innovative ideas timely into systems design, analysis and improvement particularly for a constraint-based production system in a virtual environment.

4. To become an expert in coping with the system uncertainty, examining the system random behaviour, refining the system design, and developing alternative operational management strategies based on the developed virtual prototyping system to a real industrial case study.

Unit learning outcomes

1. Critically appraise a systematic approach with lean thinking and apply it into analysis, planning, design and performance evaluation of a complex production system.

2. Examine modelling techniques and mathematical approaches for capturing the deterministic and stochastic behaviours of manufacturing and prototyping systems

Assessment strategies & instructions

The overall assessment strategy is designed to test problem solving capabilities through a case study in a virtual environment using computer-aided design and modelling simulation tools to satisfy LO1 and LO2, with solutions developed and submitted in a report. Each student is expected to develop their own computer models, which will be checked and questioned by the supervisor as part of the overall assessment.

Background

In order to be competitive, modern products must be designed with a view to production methods in which a production system should to be designed in a cost-effective way and the system is able to operate at optimal or near-optimal conditions. Nevertheless, design of a production system can be a complex process and any small change of the system design often makes a significant impact on the overall system performance. In the real-world industry, implementation of the entire production system is often very expensive and the cost of ‘getting it wrong’ can be very high. For these reasons, both system and product designers need to work together to ensure a ‘right first time’ scenario. Virtual prototyping techniques offer a potential solution to the major difficulties involved in design, analysis and performance evaluation of a product and a production system providing a fast delivery of alternative solutions at a minimum of cost. Nowadays, virtual prototyping techniques are commonly used in manufacturing sectors involving some form of computer-aided design and modelling simulation activities.

Assignment & Tasks

This assignment is based on a case study of assembling loudspeakers on a production line that needs to be investigated. A loudspeaker manufacturer has just upgraded its loudspeaker design by incorporating some forged parts with improved magnetic characteristics for the unit, which has additional benefits of reduced part count and part features to facilitate automatic feeding as well as ease of manual assembly. Figure 1 shows the basic structure of a loudspeaker and Figure 2 illustrates what is known as the motor unit assembly together with the voice coil. Figure 3 shows a cross-section through a typical loudspeaker. The assembly of an entire loudspeaker is illustrated in Figure 4 and 5, respectively. The parts in the whole assembly can be grouped into two different types namely:

1. “Soft” parts:

   • dust cap, the diaphragm, the spider and the coil

2. “Hards” parts (These are all in the ‘motor unit’ sub-assembly)

   • pole piece, the magnet and the top plate together with the frame

The proposed manufacturing facilities should as far as possible incorporate automation, however, it is still anticipated that some of the ‘soft’ parts may be assembled manually. The aim is to produce one loudspeaker every 20s over an 8hr working day and a 5-day week (1440 units/day, 7200 units/week). The speakers can be sold at £5/unit, giving a potential turnover of £36000/week and £1800000/year.

After an initial investigation of the system, data collection and analysis, the following system parameters have been identified and determined:

• Conveyors will be used and it may be 5, 10, 15 or 20 m long.

• Each frame arrives randomly and is loaded in position (manually) in NegExp 18s.

• Each pole plate can be fed/assembled in LogNormal 17s, STD: 5-15%.

• The magnet can be fed/assembled in LogNormal 19s, STD: 5-15%.

• The top plate can be fed/assembled between 15-18s in a uniform distribution.

• Manual assembly of the spider and coil by a worker takes a time of 35-45s in a uniform distribution.

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