The FLEX Family of Codes (flex_support@wai.com)

The FLEX code was first developed by Weidlinger in the early 1980s to support Nuclear Test Ban Treaty monitoring. Its name derives from its primary focus, performing Fast Large EXplicit time-domain dynamic simulations, and from its versatility and unprecedented speed in modeling unusually large structures. At the beginning of the 1990s, the FLEX tree grew three branches: NLFlex, EMFlex, and PZFlex. FLEX became NLFlex, an expanded version of the original program used to simulate blast loadings on structures. EMFlex was developed as a separate program to model electromagnetic wave propagation, in support of improved quality assurance methods for the manufacture of integrated circuits. Finally, with support from the Small Business Innovative Research program, PZFlex was developed for analysis of electro-mechanical coupling in piezoelectric devices. Ultrasound devices for medical diagnostics were the original focus of PZFlex, but it now supports myriad other applications from acoustic monitoring to MEMS design.

NLFlex - Modeling of a structure's response to blast and impact loads.

EMFlex - Modeling of electromagnetic waves and photonics.

PZFlex - Modeling for piezoelectric, sonar, ultrasound, and MEMS applications. Visit pzflex.com.

In 1999, SpectralFlex was developed to serve the growing field of medical therapeutics, which required accurate modeling of wave propagation over thousands of wave lengths in acoustic media, such as air, water, and tissue. In 2002, Weidlinger developed the Flex Template System (FTS), a graphical interface for NLFlex that provides rapid modeling and simulation of structural components of civilian structures subjected to terrorist bomb blasts. FTS is the only tool of its type to provide rapid high-fidelity simulations of blast effects on primary structural components, taking minutes instead of days or weeks. NLFlex remains the most verified and validated of any off-the-shelf product for high-fidelity models of the response of complex structures to extreme loads.

SpectralFlex - Modeling of acoustic waves for medical and sonar applications.

FTS (Flex Template System) - Rapid modeling and simulation of the response of building component to blast loads.

INTEGRA Imaging (integrasoftware@wai.com

INTEGRA was developed in the early 1980s as a ray-tracing program to serve the oil exploration industry. The software provides tools for forward and inverse modeling of complex geological regions through acoustic wave propagation. The original Geophysical Inversion Project was supported by the Small Business Innovation Research programs of the National Science Foundation (NSF) and the Department of Energy and by a consortium of petroleum and computer companies.

INTEGRA - 3-D imaging for seismic, geophysical, and petroleum prospecting.

Naval and Underwater Modeling (navalsoftware@wai.com)

Starting in the 1970s, Weidlinger developed several unique structural analysis codes with the support of the US Navy and various government agencies. These software tools were used to model submarines and surface ships and their survivability, ship signatures, and vibration and noise, and for experimentation and qualification testing. Weidlinger also worked on developing the software with many private corporations, such as AT&T Bell Laboratories, Westinghouse, Honeywell, Newport News Shipbuilding, and Electric Boat. EPSA was the first code to be developed and remains the most general and sophisticated for this type of modeling. Two subsequent programs were tailored to modeling a specific structure: SRUE to surface ships, ELSHOK to submarines. Three others were tailored to modeling specific events or their effects: WASCAT to sound waves made by equipment, UNDEX to underwater explosions, and ELSHOK to ship hull response. Recent research extends their reach to commercial concerns, such as protection against mines and oil spills.

EPSA - Modeling of response of submerged and surface structures to blast loads.

UNDEX - Modeling of underwater explosions.

SRUE - Modeling of ship response to underwater explosions.

ELSHOK - Modeling of response of submerged shells with internal structure to explosions.

WASCAT - Modeling of structural acoustics.