Accession Number:

ADA622004

Title:

Modeling and Analysis Tools for Linear and Nonlinear Mechanical Systems Subjected to Extreme Impulsive Loading

Descriptive Note:

Final rept. 1 Jul 2011-30 Jun 2014

Corporate Author:

RICE UNIV HOUSTON TX DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

2015-03-23

Pagination or Media Count:

63.0

Abstract:

The extreme impact loading high amplitude and short durations can result in wave propagation with significant nonlinear characteristics. The focus of this work was the development of high fidelity modeling and analysis methods for studying this nonlinear behavior. The Alternating Frequency-Time Finite Element Method was developed from the spectral finite element method SFEM in order to expand its high fidelity performance to study nonlinear wave propagation. Later efforts produced the Alternating Wavelet-Time Finite Element Method by using a wavelet basis. A practical force identification scheme was also developed by using SFEM to determine both temporal and spatial information about an impact load by using only a small number of sensors. The force identification scheme was also developed by using SFEM to determine both temporal and spatial information about an impact load by using only a small number of sensors. These numerical simulation techniques and force identification methods provide the means to gain new insight into the effects of extreme impact loading on structures. This improved understanding can be used to design new structures and to better understand how they will perform under severe conditions.

Subject Categories:

  • Mechanics
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE