An incremental method for studying the steady state performance of induction motors using time stepping finite element model

1997 ◽  
Vol 33 (2) ◽  
pp. 1374-1377 ◽  
Author(s):  
S.L. Ho ◽  
W.N. Fu ◽  
H.C. Wong
Keyword(s):  
Finite Element ◽  
Steady State ◽  
Finite Element Model ◽  
Induction Motors ◽  
Element Model ◽  
Incremental Method ◽  
Time Stepping ◽  
Steady State Performance

Deformation Index–Based Modeling of Transient, Thermo-mechanical Rolling Resistance for a Nonpneumatic Tire

2013 ◽  
Vol 41 (2) ◽  
pp. 82-108 ◽  
Author(s):  
James M. Gibert ◽  
Balajee Ananthasayanam ◽  
Paul F. Joseph ◽  
Timothy B. Rhyne ◽  
Steven M. Cron
Keyword(s):  
Finite Element ◽  
Steady State ◽  
Finite Element Model ◽  
Rolling Resistance ◽  
Element Model ◽  
Lumped Parameter Model ◽  
Structural Deformation ◽  
Elastic Response ◽  
Full Potential ◽  
Deformation Index

ABSTRACT When competing in performance with their pneumatic counterparts, nonpneumatic tires should have several critical features, such as low energy loss when rolling over obstacles, low mass, low stiffness, and low contact pressure. In recent years, a nonpneumatic tire design was proposed to address each of these critical issues [1]. In this study, the steady state and transient energy losses due to rolling resistance for the proposed nonpneumatic tire are considered. Typically, such an analysis is complex because of the coupling of temperature on the structural deformation and the viscoelastic energy dissipation, which requires an iterative procedure. However, researchers have proposed a simplified analysis by using the sensitivity of the tire's elastic response to changes in material stiffness through a deformation index [2–4]. In the current study, the method is exploited to its full potential for the nonpneumatic tire due to the relatively simple nature of deformation in the tire's flexible ring and the lack of several complicating features present in pneumatic tires, namely, a heated air cavity and the complex stress state due to its composite structure. In this article, two models were developed to predict the transient and steady-state temperature rise. The first is a finite element model based on the deformation index approach, which can account for thermo-mechanical details in the tire. Motivated by the simplicity of the thermo-behavior predicted by this finite element model, a simple lumped parameter model for temperature prediction at the center of the shear band was developed, which in many cases compares very well with the more detailed finite element approach due to the nature of the nonpneumatic tire. The finite element model can be used to, for example, explore the design space of the nonpneumatic tire to reach target temperatures by modifying heat transfer coefficients and/or material properties.

Steady-State Kink Band Propagation in Layered Materials

2018 ◽  
Vol 85 (6) ◽  
Author(s):  
Simon P. H. Skovsgaard ◽  
Henrik Myhre Jensen
Keyword(s):  
Finite Element ◽  
Steady State ◽  
Finite Element Model ◽  
Analytical Model ◽  
Element Model ◽  
Kink Band ◽  
Layered Materials ◽  
Transcendental Equation ◽  
Experimental Findings ◽  
Good Agreement

Failure by steady-state kink band propagation in layered materials is analyzed using three substantially different models. A finite element model and an analytical model are developed and used together with a previously introduced constitutive model. A novel methodology for simulating an infinite kink band is used for the finite element model using periodic boundary conditions on a skewed mesh. The developed analytical model results in a transcendental equation for the steady-state kink band propagation state. The three models are mutually in good agreement and results obtained using the models correlate well with the previous experimental findings.

Sign in / Sign up

Export Citation Format

Share Document