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Assignment Help Sheet 2015/16
DESIGN & ANALYSIS OF A HELICOPTER LANDING GEAR
General advice

Read the assignment brief and the marking scheme carefully!
There is no single correct answer to the assignment; however there are many wrong answers.
The report has no word limit, so you must decide how to present your work in a concise manner whilst still giving evidence of how much work you have done. As a guide, between 2000 and 4000 words for the main body of text should suffice (text in figure captions, graphs, appendices etc. are not counted).

For example: an A4 page of 12 pt text will contain between 400 and 500 words. If you have a figure on each page, this is reduced to around 250 words, so you would expect to have 16 pages at a maximum (not including the appendices).

Split the report into sections e.g. Results; Discussion; Conclusions: References etc…
In the Introduction, give the aims and objectives of the work. Describe the project and give some background information (research). Do not simply copy and paste the assignment brief.
Make reading and marking the report easy – explain the figures, discuss the graphs, etc., don’t expect your reader to work them out – they may come to a different conclusion.
Include references in your report (where necessary). These should be listed at the end of the document in the correct format and cross referenced within the document to show the source of the information or specific fact.
Use tables and graphs to display large amounts of information.
Use graphs to compare the results and discuss.
Each figure should have a reference and caption written below the figure.
Likewise, each graph should have a title (written below the figure) and each table should have a table number and caption (written above the table).
If you have included a figure in your report, you must describe it and reference the figure within the text e.g. “The free body diagram in Figure 1 shows…”. If you find you have not referenced it in your text, then it wasn’t a necessary figure!
How many graphs are required? This is dependent on how you analyse the model. You may wish to present more graphs to show your design iterations.
You will need to justify your choice of design through discussion, calculations and validation with your ADAMS model.
You must perform hand calculations and compare them to the results from your ADAMS model. You do not know your ADAMS model is correct unless you attempt to validate it using calculations. Reports which do not use hand calculations to predict the response will be awarded a lower mark. However, you do not necessarily need to compare every answer.

 
Advice on the ADAMS model

Do not write a “how to” guide of how you built the model. You should discuss the important features of your model e.g. where the connections are, what joints and why, what forces/motions you have applied etc.
Your report should not be what buttons you pressed and screenshots of toolbars.
The “additional information” sheet that accompanies the assignment brief has given you at least some of the parameters that you need to begin building a model. Your background research should give you further characteristics – your dimensions do not have to perfectly match an existing system, but you must justify your design choices and show consideration of the actual mechanism. Is your mechanism realistic; if not why not?
Your ADAMS model should adequately show the mechanism that you are proposing for the landing gear. You may use simplified models for validation (especially for hand calculations), but a model which demonstrates the actual mechanism is expected (it does not have to be in 3D).
Build your model up in stages, starting simple and then getting more complex.
Only your final model is required for submission, but that does not prevent you from showing your design iterations in the report.
Check that your model is not over (or under) constrained. When you apply a constraint (or joint) to your model it removes one or more degrees of freedom. By adding multiple joints it is easy to duplicate some of these and over constrain your model. ADAMS will have to perform unnecessary calculations for an over constrained model. To check this, right click on the information button at the bottom right of the screen and then select the tick icon (verify).
You need to generate one model which meets all of the conditions laid out in the assignment brief:
When you have specified and modelled what you think are appropriate spring/damper properties (by research and initial calculations), you need to analyse how the system responds to the being stored on the deck.
This response should be discussed, in terms of potential damage to the helicopter itself.
Is the natural frequency of your landing gear likely to be excited by a particular wave frequency? If so, what does the graph and model predict will happen? Is it a frequency which is likely to be encountered often? What can be done to improve the situation?
You should discuss any differences between hand calculations and model simulations (if there are any) and comment on why these may be present and what could be done to improve comparisons.
Your report should give sensible conclusions based on the data gathered and attempt to suggest improvements either to the system, the model, or the way it has been analysed.

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