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DM1604 - Introduction to CAD and Mechanics Assignment 2 (50% weighting)

Date Issued

Wednesday 17th Jan 2024

Date Due

Tuesday 19th  March 2024 4:00PM via Wise Flow

How is the assignment assessed?

This term’s submission is an individual assignment of your own work, consisting of several computer aided design exercises (60%) and a dynamics calculations exercise (40%). It is designed to assess your knowledge and skills in applying your understanding of CAD and mechanics to address a design problem.

Submission Guideline

•     Submit your assignment up to a maximum of an 8-page report excluding calculations.

•     Two additional video clips need to be submitted together with the report (further details below).

You should combine your report of and the mechanics calculations tasks into a single PDF file and submit it using Wise flow. Format your pages using an A4 portrait layout with narrow margins and use font size 12 using Arial type for your text.

The report should aim to tell the story of the design process you undertook to develop your CAD models and provide a description of how your understanding of mechanics has been considered and APPLIED to solve a design challenge.

Brief

Context

The handlebar and front fork designs submitted in term 1 looked great on paper but sometimes lacked any data to validate their structural integrity and strength. This could make your client satisfied in some cases, but it does mean that aesthetic models alone may need further work to ensure that your design is considered safe, operational and strong enough with any of their use case scenarios.

For this assignment we will continue with the bicycle theme but this time round, you must aim to present the client with a more functional design package of a seat post and its fixing bracket that considers the applications of finite element analysis (FEA), motion and animation studies to evidence the viability of your designs and provide more functionality and quality assurance. You may or may not want to model the seat itself.

Design Requirements and Assessment Criteria

The following Four design requirements must be addressed in your assignment and are as follows:

1. Design: Design a seat post with a fixture for the seat itself to befitted onto the bike but this time bearing in mind the function of your design under forces to enhance safety behind your geometry. You may need to carry out a task analysis to break those down and describe a scenario of use as a starting point. You may wish to produce a sketch diagram explaining the scenario you will design for and include it in the report. (for example, average riders weight, pothole). The design needs to be lightweight, made from a selection of viable material to make it strong before moving on to the next part.

2. Assembly: you then need to assemble the seat post in an appropriate position, with the fixture on, annotating any bolts, nuts, or fixtures required in your technical drawing.

3. Mechanics: Your final design needs to demonstrate how it can withstand the forces acting on it whilst in the scenario of use, therefore Its important to include any FEA carried out on the part or parts under direct stress demonstrating a realistic, feasible, methodology that you used to reach your final design outcome.

•     Produce an animation video and export it in an AVI file format not exceeding 500mb per file. The animation should generally include as a suggestion, the following aspects:

. 1x exploded diagram of how the parts will be fitted together including fixings and fixtures and a spin around camera motion showing the parts when assembled.

4. Discussions: Discuss the correlation between your design and the FEA results achieved.

•     How did FEA feed into your design process and

•     How did the decision’s made related to materials and structure affect your product.