- 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 1 (31.78 KiB) Viewed 38 times
1. Analyse the traction options in order to traverse lunar terrain effectively. The two options that you are considering are a 12-wheeled chassis across three axles and the elastic loop (track) mobility system of two tracks. The wheels are rigid and do not deform. The baseline wheeled chassis design for the lunar rover has the following physical parameters: Wheel width b (m) Grouser height (m) Number Wheel of diameter d wheels (m) 12 on 3 0.5 axles Number of grousers per wheel 25 0.3 0.01 The aluminium elastic loop mobility system design for the mobile rover has the following physical parameters (hint: you must first calculate the diameter of curvature for the tracks): Number Track of tracks width (m) Track Grouser Number Poisson's Young's Track ground height of ratio for modulus thickness length (m) grousers aluminium (GPa) for (m) (m) per track aluminium 6.00 0.01 150 0.33 69 4.37x10-3 2 0.3 (a) Calculate the NGP, VCI (single pass) and MMP for both wheeled and elastic loop mobility systems (for the elastic loop assume that the track length is in contact with the soil) (20 marks) (b) Calculate the soil sinkage, soil thrust, soil resistance, drawbar pull and theoretical maximum gradability of the mobile factory on lunar soil for both the wheeled and elastic loop mobility system designs with the following assumptions:
there is no slippage; wheel ground contact length can be computed from sinkage depth; total soil resistance is due to soil compaction resistance only; there are grousers (for the elastic loop, you can assume that half the grousers are in contact with the soil at all times). What is odd about these results? (40 marks)