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{{other uses of, Nessus NESSUS is a general-purpose,
probabilistic analysis Probability is the branch of mathematics concerning numerical descriptions of how likely an event is to occur, or how likely it is that a proposition is true. The probability of an event is a number between 0 and 1, where, roughly speaking ...
program that simulates variations and uncertainties in loads, geometry, material behavior and other user-defined inputs to compute probability of failure and probabilistic sensitivity measures of engineered systems. Because NESSUS uses highly efficient and accurate probabilistic analysis methods, probabilistic solutions can be obtained even for extremely large and complex models. The system performance can be hierarchically decomposed into multiple smaller models and/or analytical equations. Once the probabilistic response is quantified, the results can be used to support risk-informed decisions regarding reliability for safety critical and one-of-a-kind systems, and to maintain a level of quality while reducing manufacturing costs for larger quantity products. NESSUS is interfaced to all major commercial finite element programs and includes capabilities for analyzing computationally intensive real-world problems. It has been successfully applied to a diverse range of problems in aerospace, gas turbine engines, biomechanics, pipelines, defense, weaponry and infrastructure.


Project history

NESSUS was originally developed by a team led by
Southwest Research Institute Southwest Research Institute (SwRI), headquartered in San Antonio, Texas, is an independent and nonprofit applied research and development (R&D) organization. Founded in 1947 by oil businessman Tom Slick, it provides contract research and develop ...
(SwRI) as part of a 10-year
NASA The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeeding t ...
project to develop a probabilistic design tool for the
Space Shuttle The Space Shuttle is a retired, partially reusable low Earth orbital spacecraft system operated from 1981 to 2011 by the U.S. National Aeronautics and Space Administration (NASA) as part of the Space Shuttle program. Its official program na ...
main engine. In 1999, SwRI was contracted by
Los Alamos National Laboratory Los Alamos National Laboratory (often shortened as Los Alamos and LANL) is one of the sixteen research and development laboratories of the United States Department of Energy (DOE), located a short distance northwest of Santa Fe, New Mexico, ...
(LANL) to adapt NESSUS for application to extremely large and complex weapon reliability problems in support of its
Stockpile Stewardship Stockpile stewardship refers to the United States program of reliability testing and maintenance of its nuclear weapons without the use of nuclear testing. Because no new nuclear weapons have been developed by the United States since 1992, even i ...
program. In 2002, SwRI was contracted by the NASA Glenn Research Center to further enhance NESSUS for application to large-scale, aero-propulsion system problems. The end result of these two large programs was a completely redesigned software tool — NESSUS Version 8.2 — that includes a graphical user interface, three-dimensional probability contouring and results visualization, capabilities for performing advanced design of experiments and sensitivity analysis, a probabilistic input database, and interfaces to many new third-party codes such as ABAQUS, ANSYS, LS-DYNA, MSC.NASTRAN and ParaDyn.


Applications

NESSUS can compute the probabilistic response or reliability of virtually any engineered system where mathematical models can be developed to describe the performance of the system. NESSUS has been applied to a diverse range of problems including aerospace structures, automotive structures, biomechanics,
gas turbine engines A gas turbine, also called a combustion turbine, is a type of continuous flow internal combustion engine. The main parts common to all gas turbine engines form the power-producing part (known as the gas generator or core) and are, in the directi ...
, geomechanics, nuclear waste packaging, offshore structures, pipelines and rotordynamics. Recent specific applications of NESSUS include: * Aircraft Control Lever Fatigue * Automotive Crankshaft High-Cycle Fatigue * Cervical Spine Impact Injury * Tunnel Vulnerability Assessment * Orthopaedic Implant Cement Loosening * Stochastic Crashworthiness in Head-on Impact * Nuclear Weapon System Verification and Validation * Pipeline Reliability Assessment * Space Shuttle Main Engine Flow Line


See also

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Fast probability integration Fast probability integration (FPI) is a method of determining the probability of a class of events, particularly a failure event, that is faster to execute than Monte Carlo analysis. It is used where large numbers of time-variant variables contribu ...


External links


Laboratory captures four R&D Awards
*
Probabilistic engineering analysis using the NESSUS software (Structural Safety, Vol. 28, Issues 1-2, Jan-Apr 2006)





NESSUS home page
Probabilistic software