Major Design Project

Problem

$[100$ Marks$]$

Design a transmission shaft, $1\mathrm{.}8$ m long, for a wind turbine mechanical system that

transmits power from wind blades system to a Permanent Magnet Generator of

specifications given in Table $1.$ The shaft must be designed to withstand applied

loading and ensure reliable operation, with the angle of twist less or equal to $1$ degree,

over its intended lifespan of $20$ years.

Table $1$ PMG specifications

Table $2$ Mechanical Properties of shaft material

MECHANICAL ENCINEERING DESIGN$2$Questions:

Determine loading on the shaft

Determine the plane stresses magnitudes and directions

Draw a Mohr's circle of the situation

Explain and determine principal stresses and their directions

Determine the suitable solid shaft diameter under the condition and given

material grade

Calculate the inner diameter $($assuming that the outer diameter is equal to the

calculated in sub$-$question $5.)$ of a hollow shaft under the condition and given

material grade if the thickness t$=12$mm$.$ What is the gain in weight?

Determine the factor of safety if you consider Tresca failure theory

Determine the factor of safety if you consider Von Mises failure theory

Determine the critical rotation speed in case of a solid shaft and if you consider

the hollow shaft.

Prepare a comprehensive report documenting the design process, calculations,

drawings, and analysis results $(6$ pages maximum$).$

All other necessary parameters assume generic vatues and for your shaft determined

dimensions, select standard sizes.

Please provide detailed answers with clear calculations