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  • 1
    Electronic Resource
    Electronic Resource
    An expert system for choosing the best combination of options in a general purpose program for Automated Design Synthesis (1986)
    Springer
    Engineering with computers 1 (1986), S. 217-227 
    Details
    ISSN: 1435-5663
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract An expert system called EXADS has been developed to aid users of the Automated Design Synthesis (ADS) general purpose optimization program. ADS has approximately 100 combinations of strategy, optimizer, and one-dimensional search options from which to choose. It is difficult for a nonexpert to make this choice. This expert system aids the user in choosing the best combination of options based on the users knowledge of the problem and the expert knowledge stored in the knowledge base. The knowledge base is divided into three categories; constrained problems, unconstrained problems, and constrained problems being treated as unconstrained problems. The inference engine and rules are written in LISP, contains about 200 rules, and executes on DEC-VAX (with Franz-LISP) and IBM PC (with IQ-LISP) computers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01200138
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    Paper (German National Licenses)
    Fulltext
  • 2
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    An expert system for choosing the best combination of options in a general purpose program for Automated Design Synthesis (1986)
    Springer
    Details
    Publication Date: 1986-12-01
    Print ISSN: 0177-0667
    Electronic ISSN: 1435-5663
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Published by Springer
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    PAPER CURRENT
  • 3
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    Shape sensitivity analysis of wing static aeroelastic characteristics (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Journal of Aircraft (ISSN 0021-8669); 26; 712-717
    Format: text
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  • 4
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    Engineering applications of heuristic multilevel optimization methods (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Some engineering applications of heuristic multilevel optimization methods are presented and the discussion focuses on the dependency matrix that indicates the relationship between problem functions and variables. Coordination of the subproblem optimizations is shown to be typically achieved through the use of exact or approximate sensitivity analysis. Areas for further development are identified.
    Keywords: STRUCTURAL MECHANICS
    Type: Recent Advances in Multidisciplinary Analysis and Optimization, Part 3; p 1029-1037
    Format: application/pdf
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  • 5
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    Enhancements to the Design Manager's Aide for Intelligent Decomposition (DeMaid) (1992)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: This paper discusses the addition of two new enhancements to the program Design Manager's Aide for Intelligent Decomposition (DeMAID). DeMAID is a knowledge-based tool used to aid a design manager in understanding the interactions among the tasks of a complex design problem. This is done by ordering the tasks to minimize feedback, determining the participating subsystems, and displaying them in an easily understood format. The two new enhancements include (1) rules for ordering a complex assembly process and (2) rules for determining which analysis tasks must be re-executed to compute the output of one task based on a change in input to that or another task.
    Keywords: Computer Programming and Software
    Format: application/pdf
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  • 6
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    Recent advances in approximation concepts for optimum structural design (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The basic approximation concepts used in structural optimization are reviewed. Some of the most recent developments in that area since the introduction of the concept in the mid-seventies are discussed. The paper distinguishes between local, medium-range, and global approximations; it covers functions approximations and problem approximations. It shows that, although the lack of comparative data established on reference test cases prevents an accurate assessment, there have been significant improvements. The largest number of developments have been in the areas of local function approximations and use of intermediate variable and response quantities. It also appears that some new methodologies are emerging which could greatly benefit from the introduction of new computer architecture.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-104032 , NAS 1.15:104032
    Format: application/pdf
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  • 7
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    Sensitivity analysis of flutter response of a typical section and a wing in transonic flow (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A sensitivity analysis of flutter response of a two-degree of freedom airfoil with plunging and pitching degrees of freedom in transonic flow was performed using a state-space representation of the unsteady aerodynamic behavior. The structural equations of motion of the airfoil with bending and torsional degrees of freedom are coupled to the unsteady airloads, and the aeroelastic system so modeled is solved as an eigenvalue problem to determine the stability. The results of eigenanalysis showed good agreement with flutter calculations performed using a time-integration of the aeroelastic equations. The sensitivities of the flutter speed with respect to the mass and stiffness parameters wee computed by both the analytical and finite difference methods, showing excellent agreement.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 93-1646 , In: AIAA(ASME)ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 34th and AIAA/ASME Adaptive Structures Forum, La Jolla, CA, Apr. 19-22, 1993, Technical Papers. Pt. 5 (A93-33876 1; p. 2985-2997.
    Format: text
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  • 8
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    Sensitivity analysis of aeroelastic response of a wing using piecewise pressure representation (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A sensitivity analysis scheme of the static aeroelastic response of a wing is developed, by incorporating a piecewise panel-based pressure representation into an existing wing aeroelastic model to improve the model's fidelity, including the sensitivity of the wing static aeroelastic response with respect to various shape parameters. The new formulation is quite general and accepts any aerodynamics and structural analysis capability. A program is developed which combines the local sensitivities, such as the sensitivity of the stiffness matrix or the aerodynamic kernel matrix, into global sensitivity derivatives.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 93-1645 , In: AIAA(ASME)ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 34th and AIAA/ASME Adaptive Structures Forum, La Jolla, CA, Apr. 19-22, 1993, Technical Papers. Pt. 5 (A93-33876 1; p. 2974-2984.
    Format: text
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  • 9
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    Distributed computer system enhances productivity for SRB joint optimization (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Initial calculations of a redesign of the solid rocket booster joint that failed during the shuttle tragedy showed that the design had a weight penalty associated with it. Optimization techniques were to be applied to determine if there was any way to reduce the weight while keeping the joint opening closed and limiting the stresses. To allow engineers to examine as many alternatives as possible, a system was developed consisting of existing software that coupled structural analysis with optimization which would execute on a network of computer workstations. To increase turnaround, this system took advantage of the parallelism offered by the finite difference technique of computing gradients to allow several workstations to contribute to the solution of the problem simultaneously. The resulting system reduced the amount of time to complete one optimization cycle from two hours to one-half hour with a potential of reducing it to 15 minutes. The current distributed system, which contains numerous extensions, requires one hour turnaround per optimization cycle. This would take four hours for the sequential system.
    Keywords: COMPUTER SYSTEMS
    Type: NASA-TM-89108 , NAS 1.15:89108
    Format: application/pdf
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  • 10
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    Automatic Differentiation as a tool in engineering design (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Automatic Differentiation (AD) is a tool that systematically implements the chain rule of differentiation to obtain the derivatives of functions calculated by computer programs. In this paper, it is assessed as a tool for engineering design. The paper discusses the forward and reverse modes of AD, their computing requirements, and approaches to implementing AD. It continues with application to two different tools to two medium-size structural analysis problems to generate sensitivity information typically necessary in an optimization or design situation. The paper concludes with the observation that AD is to be preferred to finite differencing in most cases, as long as sufficient computer storage is available.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: AIAA PAPER 92-4743 , In: AIAA(USAF)NASA/OAI Symposium on Multidisciplinary Analysis and Optimization, 4th, Cleveland, OH, Sept. 21-23, 1992, Technical Papers. Pt. 1 (A93-20301 06-66); p. 424-432.
    Format: text
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