Machine Design - Dimensions of the Relevant Mechanical Elements - Engineering Assignment Help

Assignment Task :

Final Assessment 

Individual Submission, 

Outline: You task is to design the axle of a train and select suitable bearings and relevant dimensions of the relevant mechanical elements. Please find the image with the central forces acting on the axle at the end of this document. You are required to choose relevant design parameters appropriately, using relevant formula. 

You are to submit, as ONE pdf through Canvas: 

Your calculations, by hand on paper (scans are preferred, photos will be acceptable – make sure the pictures are all clear and readable, as we cannot mark what we cannot read). Indicate the numbers of all tables, figures, etc. from the textbook you used to acquire values wherever applicable. - An engineering drawing of your final shaft design following AS1100this must be created by hand; choose a suitable scaling factor so that the shaft fits on an A4 or A3 sheet (depending on your preference) you are not obliged to use a ruler, though it is recommended, all measures need to be clearly readable; the thicknesses of lines as thick or thin need to be clearly discernible. No title block is required for the drawing.

A brief textual description of your engineering design rational (about half a page)this must be typed with word or similar software tools. Here, you should concisely describe your design progress. You may use the following questions as guidelines: How did you start? What approach did you take? What decisions did you make and how did you select relevant parameters? What changes (if applicable) were necessary to these later? Please provide justifications and explain your reasoning. 

Task description and points distribution: For the train axle, you are to design the shaft, select suitable bearings and determine appropriate dimensions for disk brakes mounted onto the shaft. For this, you must calculate and/or determine the following: 

•  The loads and stresses in the axle to determine the minimal required diameter in the critically loaded section(s) of the shaft draw a Free-Body Diagram (FBD) for all shear forces, bending moments and torsion occurring; the FBD must be part of your submission.
•  The selection of suitable ball or roller bearings that are able to run for 5,000 hours under the occurring loading conditions (assuming an average speed of travel of 60km/h travel of the train). Bearings should be selected from the textbook or, but only if no suitable bearing for your constellation is available in the textbook, an (online) catalogues of relevant suppliers (please provide reference/link).
• You do not need to design the brake rotor in all detail, but you are to determine a suitable major diameter and contact diameter (average) for the pads.  
• Beyond this, you must ensure deflections in the shaft at the critical diameter(s) not to become too great (see recommendations on this on Slide 11 in Lecture 3). Also show that the shaft will not fatigue under the given conditions with appropriate reliability. You may make reasonable simplifications (FS and brake force for instance may be neglected for fatigue life). (8 points)
• The technical drawing of the shaft should visualise separate shoulders for each set of machine elements mounted onto it and must follow AS1100. 
• Explain all choices for diameters, sizes, etc. and your overall approach briefly as outlines above. 

Use the following parameters: 

Globally, the standard track gauge is 1435mm (that is the distance between the tracks; just as an FYI: Australia uses a non-standard gauge, but we use a standard gauge in this example). The profile width of the track for a wheel to run on is just under 70mm – the width of the part of the wheel running on the track should be larger (within reason) than this. The diameter of the wheel, at the running surface is 750mm, the total width of the wheel should not exceed 100mm – use the figure below as reference. The shaft is made from ’normalised’ steel AISI 1095. - Assume a mass of the train acting on this axle of [last four digits of your student ID] kg 

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