The Integrated Hardware/Software Sneak Analysis Approach
By: Henry D. Valdez, President of IDA Inc.
This paper explains the state of the Integrated Hardware/Software Sneak Analysis technique from the development of the Baseline Analysis Tools to clue application and through the completion of the integrated analysis phase. Also, the advantages of integrating Sneak Analysis with other design and safety analyses will be discussed...
Scaling Up Model-Based Diagnostic and Fault Effects Reasoning for Spacecraft
By: Gordon B. Aaseng, NASA Ames Research Center, Houston, TX 77058
Eric Barszcz, NASA Ames Research Center, Moffett Field, CA 94035
Henry Valdez, Independent Design Analyses, Inc., Houston, TX 77058
Haifa Moses, NASA Johnson Space Center, Houston, TX 77058
NASA developed and tested an automated model-based diagnostic and fault effects system and monitored the Orion Exploration Flight Test 1 (EFT-1) data from prelaunch to post- landing...
Sneak Analysis of Process Control Systems
By: James L. Vogas, Boeing Aerospace Operations, Inc.
Boeing developed the Sneak Analysis technique for the manned space program in 1967 to find unintended modes of behavior that are not caused by component failure. Since that time, it has been applied to many types of systems, including military, nuclear, automotive, mass transit, medical, and petrochemical. Complete systems including software, hydraulics, pneumatics, as well as electronic hardware, can be analyzed for sneak conditions. Circuitry can include combinations of analog and digital technology. Hybrids and application-specific integrated circuits (ASICs) can be easily accommodated. This paper explains the basic steps in the Sneak Analysis technique, shows the differences between the Sneak Analysis approach and other design analysis approaches, and provides several examples of sneak conditions. Relationships to other design analyses are...
Software Analysis and Simulation
By: James L. Vogas, Boeing Aerospace Operations, Inc.
Sneak Analysis complements simulation and testing by uncovering problems that may not be otherwise detected. Sneak Analysis does not predict system behavior for component failures or specific operational scenarios and, therefore, is not a replacement for simulation and testing. Simulation can be used to better understand the impact of conditions uncovered by Sneak Analysis and to evaluate fixes. Sneak Analysis can reduce schedule risks and costs by detecting errors before fabrication. Detection of potential operational problems through Sneak Analysis, including those which might appear as intermittent failures, can reduce operating costs and improve dispatch reliability. The detailed topological diagrams produced during Sneak Analysis are also useful for other analyses, evaluating design changes, and test planning and troubleshooting...
Sneak Analysis as a Software Reliability Improvement Tool
The development and introduction of complex, highly integrated electrical/electronic and microprocessor based systems into new products poses a major challenge to reliable system operation. Sneak Analysis identifies and corrects reliability-robbing design conditions, called sneaks, that frequently evade detection by traditional analysis and testing procedures...
Sneak Analysis as a Quality Assurance Tool For The Automotive Industry
By: C.Andy Hailey, Boeing Aerospace Operations Houston
The development and introduction of complex, highly integrated electrical/ electronic and microprocessor based systems into new products poses a major challenge to the automotive industry. That challenge...