A Small-sized Wind Turbine is schematically shown in Fig (a), and is delivering a maximum rated power of ( 50 KW ). This Wind Turbine is using " A Single-Stage- Spur- gearbox " to speed up the main Drive shaft speed from 20 rpm to 1400 rpm ( see Fig (b) ). In order to absorb shock loads , such gear box is suspended in space by two torque arms -as shown in Fig ( c ); which is attached to the turbine housing by a Bolted Joint, of 6 equally spaced Hexagonal bolts. requirements:

1- The Standard Design Procedure
2-Design of Torque arm,
3-Design of the Bolted Joint
4-Design of the used Spur gear Pair
5-Design of main Input Shaft together with its KEY
6-Select the Right Deep Groove Ball bearings; which are supporting the main input Shaft, and Finally
7-The Configuration of the Main Input Shaft (Product Concept, DFM, DFA, Dimensions, Fits, and Tolerances for mating parts)

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?

Briefly discuss how plastic deformation occurs in crystalline materials discuss the five most important methods of strengthening of metals and alloys.

Does the hardness of a sheet metal have an effect on its springback in bending? explain.