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Published byMelanie McKay Modified over 2 years ago

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Four Bar Linkage in Exercise Equipment Group C Robert SolidEdge Desjardins Stephanie Louttit Mark Szymanski Christopher GUI Wirz

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Overview Four Bars in Exercise Equipment Elliptical Gait Grashof & DOF SolidEdge Simulation Instant Centers MATLab Simulation Varying Parameters

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Four Bars in exercise machines!

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Elliptical Exerciser - Classification r 1 + r 2 < r 3 + r 4 Grashof Class I Kinematic Chain Crank-Rocker r2

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Elliptical Exerciser - DOF L = 4 J1 = 4 DOF = 3(L – 1) – 2(J1) –J2 DOF = 3(4 – 1) – 2(4) DOF = a 4 c b d

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Elliptical Exercisers A combination of a stair climber and a cross-country ski machine that you stand on and pedal No impact Less likely to injure joints than on a treadmill Lower perceived exertion for equivalent workout intensity

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Walking/Running When walking, feet naturally follow path of ellipse While foot 1 is flat on the ground, foot 2 is in the air moving parallel to the ground When running, feet pound (impulse) on the ground potentially causing joint injury

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Elliptical Elliptical exercisers eliminate impact with the ground by following the natural motion of the feet

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Elliptical Exerciser SolidEdge Simulation

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Elliptical Exerciser SolidEdge Simulation – Velocity Plots

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Instant Centers

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Elliptical Exerciser MATLab Simulation Matlab GUI for elliptical.zip

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Normal Standard Plebian This is the motion profile for the elliptical machine

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Varying Parameters r1r1 r2r2 r3r3 r4r4 r5r5 t1t1 t5t5 Normal Model Vince Arnold Bush Krovi But then we got the celebrities to try out our new elliptical machines!

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Model

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Vince Vaughn

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Arnold Schwarzenegger

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President Bush

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Dr. Venkat Krovi

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Conclusions Most elliptical exercisers are not adjustable for different heights and stride lengths of people By varying r2, the stride length can be tuned to different criterion Further research could be performed in changing the shape of the foot path for example: from elliptical to figure eight

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Questions

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