p02 - 1 Use MATLAB fminsearch to design a helical compression spring for a coil-over shock absorber in a small unmanned ground vehicle(UGV based on the

p02 - 1 Use MATLAB fminsearch to design a helical...

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1) Use MATLAB “fminsearch” to design a helical compression spring for a coil-over shock ab- sorber in a small unmanned ground vehicle (UGV) based on the following specifications. You must attach hard copy of your code and MATLAB output. minimum weight must fit over 0.57 inch DIA shock body minimum working force F w = 15 lbf at working length L w = 1.5 inch minimum factor of safety N FS of 1.0 to prevent static yield at shut length L s (fully com- pressed) free length L f = 3.0 inch, total number of coils N t = 14 round steel music wire or round zinc-plated steel music wire squared (closed) ends or squared-and-ground ends Current design – N t = 14, L f = 3.0 in, OD = 0.80 in, d = 0.081 in, w = 0.046 lbf, N FS = 1.30 2) Select a spring that most closely matches your optimal design from McMaster-Carr. Optimal design McMaster-Carr wire diameter d [in] ____________________ ____________________ coil OD [in] ____________________ ____________________ total number of coils N t 14 ____________________ free length L f [in] 3.0 ____________________ weight [lbf] ____________________ ____________________ coil ID [in] ____________________ ____________________ spring rate k [lbf/in] ____________________ ____________________ force at L w [lbf] ____________________ ____________________
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