Coursework Assignment 1st sit 6E6Z0010/ENGINEERING DESIGN This is an assignment for students on Level-6 of the following courses :- MEng (Hons) Mechanical Engineering BEng (Hons) Mechanical Engineering We hope that

you enjoy doing this assignment. It is an opportunity for you to demonstrate how well you can perform and report on an innovative engineering design task. Coursework Assignment 1st sit 6E6Z0010/ENGINEERING DESIGN Contents Introduction Workflow.... Coursework brief... Pass Criteria What you need to do to achieve a pass at threshold level (Mark of 40%). What you need to do to achieve a pass above threshold level (Mark above 40%)..... Supporting Learning Resources and Activities............ Assessment Notes. Deliverables............ Marking. Formative Feedback... What is being assessed? Marking Criteria Re-assessment Appendix ........... Summary of AHEP-3Learning Outcomes Evidenced... 3 4 5 5 5 .7 7 7 Error! Bookmark not defined. 11 11 Coursework Assignment 1st sit 6E6Z0010/ENGINEERING DESIGN Introduction Electricity generation is becoming a huge issue for the entire world. It has obvious impacts regarding climate change and the environment; but it is also now a big feature in economics, transport, security and geo-politics. The vast majority of engineers and scientists believe that renewable energy will be an ever-more critical feature of the electricity generation mix and it is likely that at least some of you may have a future career in this field. This coursework will give you the opportunity to explore the design of one particular type of wind-powered energy generator. Most large commercial wind power rotors use carefully formed blades that operate via the principle of aerodynamic lift. However, there are a whole set of alternative rotors that operate via the principle of aerodynamic drag. Both rotor types have advantages and disadvantages, but the focus for this coursework should be a drag-type rotor with a horizontal axis. And an important feature of the required design is that it should be PORTABLE so that it can be relatively easily assembled, disassembled and transported by an adult human e.g. from one campsite to another. Workflow 1. Main body conceptual layout • Make sketchs to explore how the main body can be arranged 4. OPTION B: Explore rotor design via a physical prototype 2. Main body detail •Model all required components •Assemble to completion • Create a detailed GA drawing • Verify the validity of the design with fundamental calculations 1. Date: 2. Date: 3. Date: 4. Date: 5. Date: 5. Make and environmental LCA of your design and compile all of the above in a report for submission (also submit all CAD files) 3. OPTION A: Explore rotor design via more sketches/CAD •Include 5 options • Add detailed design of one option to the shaft Plan a realistic schedule of work to complete this assignment on time and to a high standard. Recommended deadlines to complete each sub-task: This assignment is for 100% of your unit mark, and we expect you to spend up to 75) hours working on it. The Assignment Support video will talk you through the workflow and help guide your plan for success. Coursework Assignment 1st sit 6E6Z0010/ENGINEERING DESIGN Coursework brief Your brief is to propose a portable design of wind rotor that can be used in locations where a modest amount of off-grid electricity is required. The typical scenario for use would be outdoor/leisure activities where users may be camping in wilderness locations. Assume you are working for a client that has experience with wind generators and they believe that a horizontal axis, drag-type wind rotor is the preferred option (this is discussed further below). The power generated will obviously depend on the windspeed, and windspeed is very variable (by time and location). As a ballpark guide, aim to generate a power in the 10s of watts typically - enough to charge batteries for devices such as phones, torches, cameras etc. Therefore, a small permanent magnet dc motor is an obvious choice to use as the generator such as this 90W Crouzet (this is just a suggestion and you can research alternatives). The fundamental requirements of this coursework are split into two parts: PART 1 - MAIN BODY DESIGN Explore the conceptual design options and subsequently complete the detail design of the wind generator up to the input shaft on which the rotor will be located. Some of the key components that you will need to design are: A shaft to hold the rotor and transfer drive ● Bearings to hold the shaft and enable rotation Bearing housings to connect the bearings to a framework Gears/chain/belt drive from the shaft to the generator (a speed increase is very likely to be beneficial) A framework to secure all the components and make a complete product ● ● ● ● The design of this main body, and the General Arrangement drawing you make to illustrate it are the most fundamental features of this coursework. PART 2 OPTION A-ROTOR DESIGN VIA REPORT Explore options for the rotor element that would sit on the shaft as provided by your main body. You should be as creative as possible with regards to the shapes and materials that you consider: make five proposals and evaluate the pros/cons of each, taking into consideration materials and manufacturing processes. Take your preferred option and develop detailed engineering drawings to go alongside those of your main body. Page | Coursework Assignment 1st sit 6E6Z0010/ENGINEERING DESIGN PART 2 OPTION BROTOR DESIGN VIA PHYSICAL PROTOTYPE This option is likely to appeal to those students that enjoy hands-on designer-making and it will give you the opportunity to use the new workshop facilities. You will be asked to express an interest in this option early in the semester. It must be emphasised that, as a large group, timetabling and access to the workshops will be tricky and it is likely that if many students choose this option you may have to access the workshop outside timetabled sessions. Further details of this prototyping option will be given in the unit sessions. Pass Criteria What you need to do to achieve a pass at threshold level (Mark of 40%) The minimal requirement for this level is an engineering drawing of the main body that includes bearings, a drive arrangement, framework and a rotor What you need to do to achieve a pass above threshold level (Mark above 40%) To gain extra credit, pay attention to the detail of how you locate all the components in the main body design and create a professional GA drawing. For example, include:- ● ● ● Advanced features could include:- ● Bearings that are located axially and have an L10 life check in the report A drive system that is fully specified A design that is sensible in its overall construction (eg consider logical assembly) A GA drawing with a parts list, section views, detailed views etc as appropriate ● A check on the stress in some key load bearing components Sketches of a braking mechanism to ensure the rotor does not over-speed in high winds (detailed drawings of this are not expected) Supporting Learning Resources and Activities The quality of your engineering drawings is a critical feature of this coursework and you should use international drawing conventions. Many of these conventions will be automatically incorporated into CAD generated drawings but you can see full details of BS8888 via the library's British Standards portal. Assessment Notes As already discussed above, the type of wind generator required is one that will be portable, and have a horizontal axis, drag-type rotor. It could have various use scenarios such as leisure/camping/hiking, or for scientific research in remote locations. Drag-type rotors are less Page | 5