Synthesis of geodetic and seismological results for the 1979 Imperial Valley earthquake is approached using three-dimensional finite element modeling techniques. The displacements and stresses are calculated elastically throughout the modeled region. The vertical elastic structure in the model is derived from compressional and shear wave velocities as used in the seismic data analysis (Fuis et ...

In this study, an alternative method for conducting probabilistic fault displacement hazard analysis is developed based on stochastic source modeling and analytical formulae evaluating the elastic dislocation due to earthquake rupture. It characterizes uncertainty of fault-rupture occurrence in terms its position, geometry, slip distribution adopts so-called Okada equations calculation ground s...

This paper introduces a methodology for modeling and analyzing fault-tolerant manufacturing systems that not only optimizes normal productive processes, but also performs detection and treatment of faults. This approach is based on the hierarchical and modular integration of Petri Nets. The modularity provides the integration of three types of processes: those representing the productive proces...

Error containment is an important concept in fault-tolerant system design, and techniques like voting are applied to mask erroneous outputs, thus preventing their propagation. In this presentation we will use the example of DARTS, a fault-tolerant distributed clock generation scheme in hardware, to demonstrate that metastability is a substantial threat to error containment. We will illustrate h...

The purpose of this work is to present a Hardware Fault Simulation (HFS) methodology and tool (fs), using partial reconfiguration, suitable for efficient fault modeling and simulation in FPGAs. The methodology is particularly useful for BIST effectiveness evaluation, and for applications in which multiple fault injection is mandatory, such as in safety-critical applications. A novel (CSA – Comb...

This paper presents a sensor fault detection and identification scheme for uncertain linear time-invariant neutral delay systems. Modeling uncertainty, disturbance and noise are represented as unknown bounded inputs appearing in the state and output equations. An adaptive observer scheme extending Vemuri and Polycarpou (1997)’s work is utilized to detect and identify the fault. Robustness to th...

Fault injection techniques are important and widely used for verifying the dependability of computer systems. Traditionally fault injection has been successfully applied for evaluating dependability of hardware electronics and is now increasingly been used for software systems. At the same time increasing complexity of embedded software systems such as in automotive sector has driven these doma...

This report describes the research work conducted under CALTRANS MOU 288 on fault detection and handling for automated vehicles. The report describes fault detection and handling designs used in the longitudinal control system of platooned automated vehicles. Results are presented on experimental testing of the designs. During the course of the year the project has extended the past work on fau...

This paper considers the robust fault detection and isolation (FDI) problem for uncertain linear timeinvariant (LTI) systems. An FDI filter minimizes the sensitivity of the residual signal to disturbances and modeling errors subject to the constraint that the transfer matrix function from the faults to the residual is close to a diagonal matrix (for fault isolation). A solution of the optimizat...

A number of efforts have been recently devoted to fault modeling, fault simulation and test generation for asynchronous circuits (Shi and Makris 2004). Simulation based approach for testing gate delay faults in asynchronous sequential circuits was proposed by Sur-Kolay et al (2000). Shi and Makris (2006) have proposed a test method for path delay faults based on a design for test strategy. In s...