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This paper presents an efficient reliability-based multidisciplinary design optimization (RBMDO) strategy. The conventional
RBMDO has tri-level loops: the first level is an optimization in the deterministic space, the second one is a reliability
analysis in the probabilistic space, and the third one is the multidisciplinary analysis. Since it is computationally inefficient
when high-fidelity simulation methods are involved, an efficient strategy is proposed. The strategy [named probabilistic bi-level
integrated system synthesis (ProBLISS)] utilizes a single-level reliability-based design optimization (RBDO) approach, in
which the reliability analysis and optimization are conducted in a sequential manner by approximating limit state functions.
The single-level RBDO is associated with the BLISS formulation to solve RBMDO problems. Since both the single-level RBDO and
BLISS are mainly driven by approximate models, the accuracy of models can be a critical issue for convergence. The convergence
of the strategy is guaranteed by employing the trust region–sequential quadratic programming framework, which validates approximation
models in the trust region radius. Two multidisciplinary problems are tested to verify the strategy. ProBLISS significantly
reduces the computational cost and shows stable convergence while maintaining accuracy. 相似文献
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Ronald F. Brender 《Software》2002,32(10):955-981
The BLISS programming language was invented by William A. Wulf and others at Carnegie‐Mellon University in 1969, originally for the DEC PDP‐10. BLISS‐10 caught the interest of Ronald F. Brender of DEC (Digital Equipment Corporation). After several years of collaboration, including the creation of BLISS‐11 for the PDP‐11, BLISS was adopted as DEC's implementation language for use on its new line of VAX computers in 1975. DEC developed a completely new generation of BLISSs for the VAX, PDP‐10 and PDP‐11, which became widely used at DEC during the 1970s and 1980s. With the creation of the Alpha architecture in the early 1990s, BLISS was extended again, in both 32‐ and 64‐bit flavors. BLISS support for the Intel IA‐32 architecture was introduced in 1995 and IA‐64 support is now in progress. BLISS has a number of unusual characteristics: it is typeless, requires use of an explicit contents of operator (written as a period or ‘dot’), takes an algorithmic approach to data structure definition, has no goto , is an expression language, and has an unusually rich compile‐time language. This paper reviews the evolution and use of BLISS over its three decade lifetime. Emphasis is on how the language evolved to facilitate portable programming while retaining its initial highly machine‐specific character. Finally, the success of its characteristics are assessed. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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Comparison of MDO methods with mathematical examples 总被引:1,自引:0,他引:1
Recently, engineering systems are quite large and complicated. The design requirements are fairly complex and it is not easy
to satisfy them by considering only one discipline. Therefore, a design methodology that can consider various disciplines
is needed. Multidisciplinary design optimization (MDO) is an emerging optimization method that considers a design environment
with multiple disciplines. Seven methods have been proposed for MDO. They are Multiple-discipline-feasible (MDF), Individual-discipline-feasible
(IDF), All-at-once (AAO), Concurrent subspace optimization (CSSO), Collaborative optimization (CO), Bi-level integrated system
synthesis (BLISS), and Multidisciplinary design optimization based on independent subspaces (MDOIS). Through several mathematical
examples, the performances of the methods are evaluated and compared. Specific requirements are defined for comparison and
new types of mathematical problems are defined based on the requirements. All the methods are coded and the performances of
the methods are compared qualitatively and quantitatively. 相似文献
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