2_Unit1.2_Measurement copy

2_Unit1.2_Measurement copy

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Unformatted text preview: CESS MEASURE!!!!!!!!!!!! Brain activity/ imaging Kinematics •  Measures which describe motion, without regard to the cause of that motion. •  Muybridge (1878) in California, was the first to capture serial images of fast animal motion. Kinematics •  Modern systems such as Optotrak use infra-red technology to relay the spatio-temporal positions of markers. 3-D Data can be captured at 1000 Hz. LUMINARE brothers created motion pictures. x-y 13 Kinematics Video/film Optoelectric Slow sampling rate Fast sampling rate Wide workspace of data collection Narrower workspace (less as Hz increases) Very precise Variation in precision of measurement Forgiving (extrapolation) Less forgiving Inexpensive Expensive Schmidt & Lee (1999) X axis Z ax is Y axis Kinematics 3 Dimensions Both methods provide raw data in the form of x, y, and z coordinates. From this we can calculate the following: Displacement (linear/angular) Velocity (linear/angular) Acceleration (linear/angular) Coordination (relative motion) Motion Analysis 14 Motion Analysis Displacement displacement is change in spatial position. •  Change in spatial position Disp (m) 0 0 4.1 20 7.9 80 19.8 100 24.1 120 28.1 160 35.8 180 40.0 200 140 32.1 know how to calculate these things for the exam!!!!!!! Displacement 250 60 15.7 Accel (m/ s^2) 40 11.9 Velocity (m/s) Displacement (m) Time (s) 200 150 100 50 0 0 5 10 15 20 25 30 35 40 45 Time (s) Velocity •  the rate of change in position (displacement) Time (s) Disp (m) 0 0 4.1 20 7.9 40 11.9 60 15.7 100 24.1 180 40.0 Δtime 20 – 0 m 160 35.8 v= Δdisplacement 140 32.1 v= 120 28.1 Accel (m/ s^2) 80 19.8 Velocity (m/s) 200 4.1 – 0s v = 4.88 m/s 15 konw how to calcualte this shit!!!! Velocity •  the rate of change in position (displacement) Disp (m) Velocity (m/s) 0 0 4.88 4.1 20 5.29 7.9 40 5.02 11.9 60 5.22 15.7 80 4.91 19.8 100 120 140 4.88 32.1 160 5.43 35.8 180 200 Δdisplacement Velocity Δtime 20 – 0 m v= 4.1 – 0s 4 3 v = 4.88 m/s 2 4.76 40.0 5 5.06 28.1 v= 7 6 4.61 24.1 Accel (m/ s^2) Velocity (m/s) Time (s) N/A 1 0 0 5 10 15 20 25 30 35 40 Time (s) Acceleration •  the rate of change in velocity Time (s) Disp (m) Velocity (m/s) 0 0 4.88 4.1 20 5.29 7.9 40 60 80 4.91 19.8 100 4.61 24.1 120 140 160 5.43 35.8 180 4.76 40.0 200 Δtime 5.29 - 4.88 m/s 4.88 32.1 Δvelocity 5.06 28.1 a= 5.22 15.7 a= 5.02 11.9 Accel (m/ s^2) N/A 4.1 – 0s a = 0.1 m/s^2 this shit tooo Acceleration •  the rate of change in velocity Disp (m) Velocity (m/s) Accel (m/ s^2) 0 0 4.88 0.10 4.1 20 5.29 -0.07 7.9 40 5.02 0.05 11.9 60 5.22 -0.08 15.7 80 4.91 -0.07 19.8 100 4.61 0.10 24.1 120 5.06 -0.05 28.1 140 4.88 0.13 32.1 160 5.43 -0.18 35.8 180 4.76 N/A 40.0 200 N/A a= 0.5 0.4 Acceleration (m/s^2) Time (s) 0.3 a= Δvelocity Acceleration Δtime 5.29 - 4.88 m/s N/A 0.2 0.1 0 -0.1 0 4.1 – 0s 5 a = 0.1 10 15 m/s^2 20 25 30 35 -0.2 -0.3 -0.4 -0.5 Time (s) 16 ankle for small perturbrences and hip for big shoves or per turbences. Coordination •...
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This document was uploaded on 03/28/2014 for the course KNES 385 at Maryland.

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