Hybrid soft soil tire model (HSSTM). Part III : Model parameterization and validation

Part I describes the tire structure model; part II the contact detection and contact interface models for rigid and deformable terrains; part III the model parameterization and validation. Model parameters are estimated using non-linear least-square optimization to minimize the error between the Hybrid Soft Soil Tire Model (HSSTM) predictions and experimental data. The parameterization routines’ initial conditions are estimated from modal analysis in radial and circumferential directions. The preliminary parameterized model is incorporated in the optimization routine to find tire sidewall and belt parameters in the radial direction using quasi-static cleat loading test data. The vertical force at the spindle and tire contact patch are used to study the model accuracy in the radial direction. FlatTrac tire longitudinal and lateral force test data are employed to estimate the parameters in these directions. The tire shear force and moment at the spindle are validated against experimental data for lateral dynamics performance.The Cooperative Agreement W56HZV-14-2-0001 US Army TARDEC/ARC, by the European Union Horizon 2020 Framework Program, Marie Sklodowska-Curie grant agreement no. 645736, by the Terramechanics, Multibody, and Vehicle Systems (TMVS) Laboratory and the NSF I/UCRC Center for Tire Research (CenTiRe) at Virginia Tech, U.S.A., and by the Vehicle Dynamics Group at the University of Pretoria, South Africa.http://www.elsevier.com/locate/jterra2021-04-01hj2020Mechanical and Aeronautical Engineerin

Fabrication, testing and simulation of a high spatial resolution alpha-particle imager based on ZnO nanowires in a polycarbonate nanoporous membrane

A new architecture consisting of ZnO nanowires embedded in a polycarbonate nanoporous membrane was proposed, fabricated and simulated as a high spatial resolution alpha particle imager. The experimental and Geant4 simulation results showed that ZnO nanowires could act as scintillating fibers to prevent spread of the generated optical photons inside the imager. This property can be used to precisely determine alpha collision coordinates. An array of these nanowires can be also applied as a new high spatial resolution alpha particle imager