1 ACS6124 Multisensor and Decision Systems Part II: Decision Systems for Engineering Design Assignment 2020/21 ACS6124 incorporates two assignments – one for each Part of the module. This document introduces the assignment for Part II, providing submission instructions, a detailed assignment briefing, and the marking criteria. Assignment weighting: 50% of the module Assignment released: 7 May 2021 (Friday, Week 10) Assignment due: 23:59, 7 June 2021 (Moday, Exam Week 3) Format: A report of 15 pages maximum (using a top and bottom margin of 1.5 inches, a left and right margin of 1 inch, text of size 12 point, with 1.5 line spacing). The report must be submitted both electronically via BlackBoard. Assignment code: ACS6124-002 Penalties for late submission Late submissions will incur the usual penalties of a 5% reduction in the mark for every working day (or part thereof) that the assignment is late and a mark of zero for submission more than 5 working days late. For more information, see https://www.sheffield.ac.uk/ssid/assessment/grades-results/submission-marking Unfair means This is an individual assignment. You should not discuss the assignment with other students or work together with other students in its completion. The assignment must be wholly your own work. References must be provided to any other work that is used as part of the assignment. Any suspicion of the use of unfair means will be investigated and may lead to penalties. For more information, see https://www.sheffield.ac.uk/ssid/unfair-means Extenuating circumstances If you have any medical or special circumstances that you believe may affect your performance on the assignment then you should raise these with the Module Leader at the earliest opportunity. You will also need to submit an extenuating circumstances form. For more information, see https://www.sheffield.ac.uk/ssid/forms/circs Help If you have any questions on the assignment, please email me at:
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[email protected] Feedback Written feedback will be provided on Blackboard within 15 working days, in line with Department guidelines. 2 Assignment briefing Image you are a recently graduate student that has decided to build his own start-up company working on decision systems for engineering design. Your first possible client is a company working on a new type of nuclear-powered vehicle. While their team is capable at designing the new powertrain, they have limited experience in designing the rest of the vehicle, for example they need to implement a suitable controller for their propulsion engine and are not sure how it might affect the dynamic performance of the car. Your task is to convince them that your start-up company is perfectly suited to help them in the decision making process. To do that, they have asked you to prepare a report to highlight the capabilities of the tools you are proposing to use. Because at this stage they are reluctant to share their Simulink models, your pilot study will focus on tuning the gains for a Proportional-Integral (PI) controller, such that a feedback control system satisfies a set of requirements. The system to be controlled, and the performance criteria against which a set of controller gains are assessed, are described in the Laboratory A instructions. The goals for the performance criteria are given in the instructions for Laboratory B. During Laboratory A, you learned about the relationships between the design variables and the performance criteria for the given system. In Laboratory B, you attempted to optimize the gains to meet the goals for the performance criteria. Now you need to write a report that would appeal to both the CEO of your possible client and their Chief Engineer. You need to convince the CEO that multi-objective optimization is the best way to do decision making. So far his company used opinions from experts and developed prototypes to validate their designs. In addition, you need to have a technical part in which you show their Chief Engineer what your pilot study has managed to achieve, explaining any challenges encountered in satisfying all the requirements, and making recommendations for tuning options Your report should be structured as follows: Title page including Executive Summary (1 page) Summarise the outcomes of the tuning process and recommendations for PI gain settings in under 300 words. This section does not contribute to the page limit for the report. Section 1: Multi-objective optimization for Engineering Design (3 pages) Write a brief introduction to Decision Systems for Engineering Design. Explain how it compares with other approaches used in decision making and give 5 examples from the literature where it has been used for vehicle design. Draw a comparison between three classes of population-based optimizers that can be used as the engine for a multi-objective optimization process. Explain the main differences in their approach to find an approximation set Section 2: Problem Formulation (1 page) Express the problem in formal mathematical terms. Section 3: Sampling Plan (2 pages) Show at least three different sampling plans and analyse their space-filling performance. Identify a sampling plan to take forward. Section 4: Knowledge Discovery (2 pages) Use the evaluations from the chosen sampling plan to describe the relationships between the design variables and performance criteria. 3 Section 5: Optimization Process (2 pages) Describe the optimization approach used and how goals were incorporated into the process. Section 6: Optimization Results (2 pages) Show the results of the optimization process, indicating whether or not the goals have been met, and the trade-offs inherent to the problem. Section 7: Recommendations (1 page) Based on the knowledge discovery and optimization results, make recommendations for PI controller options for consideration by the Chief Engineer. Section 8: Conclusions (1 page) Link the results of your study with the car design problem your client is keen to solve. How would you apply the same methodology for their problem? Indicate at least two other decision systems tools that you propose to use to help them in vehicle design problem. Bibliography Include references to any works used in the report. This section does not contribute to the page limit for the report. Appendix Provide your Matlab code listings as an appendix to the report. The appendix do not count towards the page count for the report. Marking criteria The assignment will be marked out of 100. The marking criteria below provide guidance on the relationship between the quality of submission and the marks awarded. Note that the quality statements are indicative only – the actual mark awarded will be a holistic judgment of the overall quality of submitted work. Mark awarded Expected attributes of the technical report 70-100 An executive summary that succinctly summarises the findings of the tuning process and recommendations for future action. A problem formulation that correctly interprets the problem features in the language of constrained multi-objective optimization, including identification of design variables, parameters, objectives and constraints. A set of at least three sampling plans that have been correctly assessed in terms of their space-filling properties. Appropriate and creative data mining and visualisation of the sampling plan evaluation, identifying key relationships between design variables and objectives (e.g. regions of stability, trade-offs between aspects of transient performance). A clear description of the optimization approach used, including how Chief Engineer preferences were incorporated into the search process. Appropriate and creative data mining and visualisation of the results of the optimization process, identifying the level of success achieved and areas of conflict that are as yet unresolved. A coherent and credible set of recommendations for the controller gain settings, reflecting the results of the knowledge discovery and optimization processes. Well-presented report, with appropriate use of labelled figures and few spelling or grammatical errors. 4 Mark awarded Expected attributes of the technical report 60-69 An executive summary that succinctly summarises the findings of the tuning process and recommendations for future action. A problem formulation that correctly interprets the problem features in the language of constrained multi-objective optimization, including identification of design variables, parameters, objectives and constraints. A set of at least three sampling plans that have been correctly assessed in terms of their space-filling properties. A creditable attempt to identify key relationships between design variables and objectives through visualisation of the sampling plan evaluation (e.g. regions of stability, trade-offs between aspects of transient performance). A clear description of the optimization approach used. A creditable attempt to analyse the results of the optimization process, identifying the level of success achieved. Recommendations for the controller gain settings that are largely grounded in the results of the knowledge discovery and optimization processes. Generally well-presented report, with appropriate use of labelled figures and few spelling or grammatical errors. 50-59 An executive summary that includes an attempt to summarise the findings of the tuning process and makes recommendations for future action. A problem formulation that interprets the problem features in the language of constrained multi-objective optimization, but where the formulation may contain some missing or unclear elements. An appropriately visualised sampling plan. Some attempt to identify key relationships between design variables and objectives through visualisation of the sampling plan evaluation (e.g. regions of stability, trade-offs between aspects of transient performance). A description of the optimization approach used, although some aspects may not be clearly described. A creditable attempt to analyse the results of the optimization process, identifying the level of success achieved. Recommendations for the controller gain settings that are largely grounded in the results of the knowledge discovery and optimization processes. Generally well-presented report, with appropriate use of labelled figures and few spelling or grammatical errors. 40-49 An executive summary that provides a readable summary of the report, but is lacking focus on findings and recommendations. A problem formulation that interprets the problem features in the language of constrained multi-objective optimization, but where the formulation may contain some missing, unclear elements, or incorrect elements. An appropriately visualised sampling plan. Lacking a convincing analysis of the key relationships between design variables and objectives through visualisation of the sampling plan evaluation (e.g. regions of stability, trade-offs between aspects of transient performance). A description of the optimization approach used, although some aspects may not be clearly described. Results of the optimization process are presented, but these are not analysed. Lacking recommendations for the controller gain settings, or recommendations that do not relate to the results of the knowledge discovery and optimization processes. Issues with the presentation of the report, with numerous grammatical errors and figures that are missing labels. 5 Mark awarded Expected attributes of the technical report 0-39 Missing or incoherent executive summary. Missing or incoherent problem formulation. Some evidence of a sampling plan, but unclear what this looks like. Lacking a convincing analysis of the key relationships between design variables and objectives through visualisation of the sampling plan evaluation (e.g. regions of stability, trade-offs between aspects of transient performance). Missing or incoherent description of the optimization approach used. Missing the results of the optimization process. Lacking recommendations for the controller gain settings, or recommendations that do not relate to the results of the knowledge discovery and optimization processes. Major issues with the presentation of the report, with numerous grammatical errors and figures that are missing labels, such that the meaning in the report is hard to discern.
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