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Models of Foam Behavior: Micro  Macroscopic Modeling 

Seat-Occupant and Polyurethane Foam Modeling Anil Bajaj & Patricia Davies, School of Mechanical Engineering, Purdue University. Contact: bajaj@ecn.purdue.edu & daviesp@ecn.purdue.edu. Goal: Relate seat materials and construction to occupant settling point and vibration response.

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Models of Foam Behavior: Micro  Macroscopic Modeling 

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  1. Seat-Occupant and Polyurethane Foam ModelingAnil Bajaj & Patricia Davies, School of Mechanical Engineering, Purdue University. Contact: bajaj@ecn.purdue.edu & daviesp@ecn.purdue.edu Goal:Relate seat materials and construction to occupant settling point and vibration response. Models of Foam Behavior:Micro  Macroscopic Modeling  Hyperelastic models & polynomial nonlinear elastic models. Hereditary & fractional derivative models of viscoelasticity, linear and nonlinear. System identification: long memory, excitation properties for robust identification. Seat Occupant Models: Simplified models that include material properties to facilitate seat design and understanding of seat-occupant dynamics. 2 Hz 8 Hz On-going and Future Work: Modeling seat-occupant interfacial forces and shear effects. Response of multi-layered foams. More global models of foam to predict static response and dynamic response over a larger range of excitations.

  2. Aircraft Noise & Sleep Disturbance ModelingMassaquoi and McCarley’s Combined Sleep Model (1992) X - REM On; Y - REM Off Circadian variation-Sinusoidal term with a period of 24 hrs Uniform Random Noise Excitatory Term Time (min) N (Poisson Shot Noise)

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