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Musculoskeletal Biomechanics BIOEN 520 | ME 527
Lab 2 Cadaveric Gait
SimulaBon
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Lab 2 Overview... • Gait lab tour and demo • Biomechanical tesBng lab tour and demo • Lab 2 assignment
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RoboBc Gait Simulator
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3 learning cycles, 5.6% BW RMS tracking error
vGRF with the RGS
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RMS tracking error for extrinsic tendons ranged from 2.6N for FDL to 5.6N for TP mean value of 3.9N across all 18 final trials TA and Achilles were adjusted by controller
Muscle forces with the RGS
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RGS • inputs: Bbia kinemaBcs, muscle forces, and the verBcal ground reacBon force
• outputs: plantar pressure, center of pressure (CoP), and foot bone kinemaBcs
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Lab assignment • Part I: Calculate CoP from force plate Kistler, 8 channels (8 forces) AMTI, 6 channels (3 forces and 3 moments) 1000Hz, mechanical grounding
• Part II: Compare CoP from force plate to pressure mat array of many small capaciBve force sensors 36 Hz, more coarse
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Summing GRF
COP (ax, ay, az)
Tz
rcop
rcop = [ax, ay, az]
MGRF= rcop × F + Tz
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Data header
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Data header
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Data header
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Force plate dimensions
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Kistler force plate coordinate system
(+,+)
(-,-) (-,+)
(+,-)
+y
+x
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novel pressure mat coordinate system
+y
+x
(+,+)