Study of industrially applied methods for verification, validation and uncertainty quantification of simulator models

2015 ◽  
Vol 06 (02) ◽  
pp. 1550014 ◽  
Author(s):  
Magnus Eek ◽  
Sogol Kharrazi ◽  
Hampus Gavel ◽  
Johan Ölvander
Keyword(s):  
Uncertainty Quantification ◽  
Simulation Models ◽  
Verification And Validation ◽  
Credibility Assessment ◽  
Driving Simulators ◽  
Exploratory Case Study ◽  
Aircraft System ◽  
National Road ◽  
Further Development

To better utilize the potential of system simulation models and simulators, industrially applicable methods for Verification, Validation and Uncertainty Quantification (VV&UQ) are crucial. This paper presents an exploratory case study of VV&UQ techniques applied on models integrated in aircraft system simulators at Saab Aeronautics and in driving simulators at the Swedish National Road and Transport Research Institute (VTI). Results show that a large number of Verification and Validation (V&V) techniques are applied, some of which are promising for further development and use in simulator credibility assessment. Regarding the application of UQ, a large gap between academia and this part of industry has been identified, and simplified methods are needed. The applicability of the NASA Credibility Assessment Scale (CAS) at the studied organizations is also evaluated and it can be concluded that the CAS is considered to be a usable tool for achieving a uniform level of V&V for all models included in a simulator, although its implementation at the studied organizations requires tailoring and coordination.

scholarly journals Some Issues in the Testing of Computer Simulation Models

2016 ◽  
Vol 5 (1) ◽  
pp. 1-10
Author(s):  
David Murray-Smith
Keyword(s):  
Simulation Model ◽  
Model Validation ◽  
Simulation Models ◽  
Model Testing ◽  
Model Verification ◽  
Verification And Validation ◽  
Quality Data ◽  
Model Quality ◽  
Face Validation

The testing of simulation models has much in common with testing processes in other types of application involving software development. However, there are also important differences associated with the fact that simulation model testing involves two distinct aspects, which are known as verification and validation. Model validation is concerned with investigation of modelling errors and model limitations while verification involves checking that the simulation program is an accurate representation of the mathematical and logical structure of the underlying model. Success in model validation depends upon the availability of detailed information about all aspects of the system being modelled. It also may depend on the availability of high quality data from the system which can be used to compare its behaviour with that of the corresponding simulation model. Transparency, high standards of documentation and good management of simulation models and data sets are basic requirements in simulation model testing. Unlike most other areas of software testing, model validation often has subjective elements, with potentially important contributions from face- validation procedures in which experts give a subjective assessment of the fidelity of the model. Verification and validation processes are not simply applied once but must be used repeatedly throughout the model development process, with regressive testing principles being applied. Decisions about when a model is acceptable for the intended application inevitably involve some form of risk assessment. A case study concerned with the development and application of a simulation model of a hydro-turbine and electrical generator system is used to illustrate some of the issues arising in a typical control engineering application. Results from the case study suggest that it is important to bring together objective aspects of simulation model testing and the more subjective face- validation aspects in a coherent fashion. Suggestions are also made about the need for changes in approach in the teaching of simulation techniques to engineering students to give more emphasis to issues of model quality, testing and validation.

Verification and Validation of Pipeline Terminal Simulation Models

2014 ◽  
Author(s):  
Frank Lin ◽  
Allan Chegus ◽  
Dumitru Cernelev
Keyword(s):  
Simulation Model ◽  
Simulation Models ◽  
Difficult Problem ◽  
Verification And Validation ◽  
Optimization Software ◽  
Simulation And Optimization ◽  
Terminal Performance ◽  
Model Validity ◽  
Complex Simulation

The problem of validating a complex simulation model represents pipeline terminal performance with verifiable accuracy is a difficult problem requiring extensive testing and calibration. This paper discusses a case study of the verification and validation of a terminal simulation model. The approach to deciding model validity is presented as well as the process of verifying and validating the model including methodology and thresholds for acceptance. Ultimately the paper demonstrates the ability of commercial simulation and optimization software to work collaboratively to determine an optimal business solution.

Management of Optic Neuritis in Ayurveda - A Special Case Report

2018 ◽  
Vol 3 (5) ◽  
Author(s):  
Dr. Harsha S. ◽  
Dr. Mamatha KV.
Keyword(s):  
Optic Nerve ◽  
Optic Neuritis ◽  
Visual Information ◽  
Vision Loss ◽  
Specific Treatment ◽  
Interesting Case ◽  
Treatment Modalities ◽  
Further Development ◽  
Special Case

The optic nerve carries visual information from your eye to your brain. Optic neuritis is when your optic nerve becomes inflamed. Optic neuritis can flare up suddenly from an infection or nerve disease. The inflammation usually causes temporary vision loss that typically happens in only one eye. Those with Optic neuritis sometimes experience pain. As you recover and the inflammation goes away, your vision will likely return. There are no direct references in our classics regarding optic neuritis but can be contemplated as a condition by name Parimlayi Timira. The specific management as such is not cited but a transcendence approach can be done with adopting the treatment which has the ability to pacify the already occurred pathology and prevent the further development of the disease. One such interesting case study on Optic neuritis is elaborated here where in specific treatment modalities (Shodana, Shamana and Kriyakalpas) played role in pacifying the condition.

A Problem in the Making: How Firms Formulate Sharable Problems for Open Innovation Contests

2018 ◽  
Author(s):  
Martin W. Wallin ◽  
Georg von Krogh ◽  
Jan Henrik Sieg
Keyword(s):  
Knowledge Creation ◽  
Open Innovation ◽  
Problem Formulation ◽  
Theoretical Framework ◽  
Monetary Reward ◽  
Technical Innovation ◽  
Prior Work ◽  
Exploratory Case Study ◽  
External Sources

Crowdsourcing in the form of innovation contests stimulates knowledge creation external to the firm by distributing technical, innovation-related problems to external solvers and by proposing a fixed monetary reward for solutions. While prior work demonstrates that innovation contests can generate solutions of value to the firm, little is known about how problems are formulated for such contests. We investigate problem formulation in a multiple exploratory case study of seven firms and inductively develop a theoretical framework that explains the mechanisms of formulating sharable problems for innovation contests. The chapter contributes to the literatures on crowdsourcing and open innovation by providing a rare account of the intra-organizational implications of engaging in innovation contests and by providing initial clues to problem formulation—a critical antecedent to firms’ ability to leverage external sources of innovation.

Poetics and subjectivities between classicism and Romanticism

2018 ◽  
Author(s):  
Andrew Kahn ◽  
Mark Lipovetsky ◽  
Irina Reyfman ◽  
Stephanie Sandler
Keyword(s):  
Eighteenth Century ◽  
Case Studies ◽  
Literary Culture ◽  
Human Subjectivity ◽  
Literary Forms ◽  
Russian Poetry ◽  
Development Of Identity ◽  
Further Development

In the context of Sentimentalism in the 1770s, literary culture opened up to representations of human subjectivity. The chapter considers genres of poetry devoted to the themes of pleasure, death, and posterity. It also considers the spaces of poetry and modes of exchange, whether through the album, the salon, and the verse epistle. Two case studies explore the use of different literary forms in the further development of identity, individual and also authorial. The first looks at Radishchev’s experiment in writing a fictional diary as a psychological exercise. The second examines the tradition of imitation of Horace’s Monument poem in Russian poetry in the eighteenth century as well as by later poets, such as Pushkin and Brodsky. The case study shows how these Russian versions express changing ideas about imitation and originality as well as poets’ concern with posterity.

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