Answer Happy

You are to design a 10 tonne mobile factory for deployment on the Moon (note that g=1.62 m/s2 on the Moon) assuming the following lunar soil parameters: Density Soil Friction Modulus of Modulus of (kg/m?) cohesion angle cohesion of friction of (Pa) (0) soil soil deformation, deformation, kc (N/m"+1) ku (N/mn+2) 1520 170 35 1400 820000 Soil deformation exponent, n 1.0 Lunar regolith
4. Calculate the drill thrust force and rotary torque required for a rotary drill drilling into lunar regolith using Nishimatsu's equations using the following parameters: (20 marks) m a Parameter Symbol Initial weight-on-bit Fo Number of drill bits per tool Soil cohesion с Soil friction angle ф Rake angle of cutting edge Friction angle between soil/tool Drill cutting depth h Drill bit width d Soil deformation coefficient Ultimate compressive strength of Hc regolith Value 1000 N 1 170 Pa 350 20° 26° 0.5 m 0.2 m 11.3-0.18α 2C/[tan(45-0/2)] n
το Initial torque Drill radius C+octano 0.1 m Ri