The Experts below are selected from a list of 30 Experts worldwide ranked by ideXlab platform
Robert E Voros - One of the best experts on this subject based on the ideXlab platform.
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seeking an open framework for systems engineering in aeronautics and astronautics
53rd AIAA Aerospace Sciences Meeting, 2015Co-Authors: Vicki S Johnson, Robert E VorosAbstract:The use of Systems Engineering (SE) is pervasive and growing in many fields. Among these fields are increasing numbers of standards and guidance materials. The two primary types of SE models are acquisition and regulatory. Use of these different models can be challenging because they have different approaches and terminology. A brief history of these models for civilian aircraft is presented along with the context of overlaps between the various models. A significant effort is made to show the alignment of and differences between models through an analysis of common words. The analysis shows that there is a core set of concepts between the models. Building on this analysis, an initial framework for a universal SE model containing common terminology is proposed. Using the concept of a Systems Engineering Engine put forth by NASA, the proposed model applies at each level (i.e., aircraft, system, component). The model contains a filtered set of processes associated to design and realization based on technical requirements; the reduced set of processes contained in an open framework better facilitates the needs of both the acquisition and regulatory standards and leaves open the possibility of adding variants to accommodate additional needs. The virtuous overlap of the proposed framework would help assure a safe design, provide a more timely and cost effective product development lifecycle, and reduce total effort towards the development and Compliance Demonstration of a product.
Vicki S Johnson - One of the best experts on this subject based on the ideXlab platform.
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seeking an open framework for systems engineering in aeronautics and astronautics
53rd AIAA Aerospace Sciences Meeting, 2015Co-Authors: Vicki S Johnson, Robert E VorosAbstract:The use of Systems Engineering (SE) is pervasive and growing in many fields. Among these fields are increasing numbers of standards and guidance materials. The two primary types of SE models are acquisition and regulatory. Use of these different models can be challenging because they have different approaches and terminology. A brief history of these models for civilian aircraft is presented along with the context of overlaps between the various models. A significant effort is made to show the alignment of and differences between models through an analysis of common words. The analysis shows that there is a core set of concepts between the models. Building on this analysis, an initial framework for a universal SE model containing common terminology is proposed. Using the concept of a Systems Engineering Engine put forth by NASA, the proposed model applies at each level (i.e., aircraft, system, component). The model contains a filtered set of processes associated to design and realization based on technical requirements; the reduced set of processes contained in an open framework better facilitates the needs of both the acquisition and regulatory standards and leaves open the possibility of adding variants to accommodate additional needs. The virtuous overlap of the proposed framework would help assure a safe design, provide a more timely and cost effective product development lifecycle, and reduce total effort towards the development and Compliance Demonstration of a product.
Michael J Davies - One of the best experts on this subject based on the ideXlab platform.
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results variability in accredited building energy performance Compliance Demonstration software in the uk an inter model comparative study
Journal of Building Performance Simulation, 2010Co-Authors: Rokia Raslan, Michael J DaviesAbstract:In the context of performance-based building regulations, the benefits provided by building energy performance prediction tools in facilitating the exploration of innovative approaches to achieving performance requirements has been recognized. In accordance with the Directive on Energy Performance of Buildings (EPBD), the UK has introduced a methodology that allows the use of accredited third-party software for demonstrating Compliance with energy performance criteria outlined in the relevant technical guidance for the non-domestic sector. This study investigates the issue of predictive inconsistencies between accredited tools available at the time of writing and presents the final results of an inter-model comparative analysis that examines the extent of variability in key Compliance outputs. An overview of tool applicability limitations and issues associated with results variability are presented. Implications concerning the credibility of the methodology and recommendations to address current shortcomi...
Arthur S Rood - One of the best experts on this subject based on the ideXlab platform.
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performance evaluation of aermod calpuff and legacy air dispersion models using the winter validation tracer study dataset
Atmospheric Environment, 2014Co-Authors: Arthur S RoodAbstract:Abstract The performance of the steady-state air dispersion models AERMOD and Industrial Source Complex 2 (ISC2), and Lagrangian puff models CALPUFF and RATCHET were evaluated using the Winter Validation Tracer Study dataset. The Winter Validation Tracer Study was performed in February 1991 at the former Rocky Flats Environmental Technology Site near Denver, Colorado. Twelve, 11-h tests were conducted where a conservative tracer was released and measured hourly at 140 samplers in concentric rings 8 km and 16 km from the release point. Performance objectives were unpaired maximum one- and nine-hour average concentration, location of plume maximum, plume impact area, arc-integrated concentration, unpaired nine-hour average concentration, and paired ensemble means. Performance objectives were aimed at addressing regulatory Compliance, and dose reconstruction assessment questions. The objective of regulatory Compliance is not to underestimate maximum concentrations whereas for dose reconstruction, the objective is an unbiased estimate of concentration in space and time. Performance measures included the fractional bias, normalized mean square error, geometric mean, geometric mean variance, correlation coefficient, and fraction of observations within a factor of two. The Lagrangian puff models tended to exhibit the smallest variance, highest correlation, and highest number of predictions within a factor of two compared to the steady-state models at both the 8-km and 16-km distance. Maximum one- and nine-hour average concentrations were less likely to be under-predicted by the steady-state models compared to the Lagrangian puff models. The characteristic of the steady-state models not to under-predict maximum concentrations make them well suited for regulatory Compliance Demonstration, whereas the Lagrangian puff models are better suited for dose reconstruction and long range transport.
J Simonds - One of the best experts on this subject based on the ideXlab platform.
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idaho cercla disposal facility complex Compliance Demonstration for doe order 435 1
2006Co-Authors: J SimondsAbstract:This Compliance Demonstration document provides an analysis of the Idaho CERCLA Disposal Facility (ICDF) Complex Compliance with DOE Order 435.1. The ICDF Complex includes the disposal facility (landfill), evaporation pond, administration facility, weigh scale, and various staging/storage areas. These facilities were designed and constructed to be compliant with DOE Order 435.1, Resource Conservation and Recovery act Subtitle C, and Toxic Substances Control Act polychlorinated biphenyl design and construction standards. The ICDF Complex is designated as the Idaho National Laboratory (INL) facility for the receipt, staging/storage, treatment, and disposal of INL Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) waste streams.