Conceptual Design Optimization of High Altitude Airship in Concurrent Subspace Optimization

2012 ◽  
Author(s):  
Haoquan Liang ◽  
Ming Zhu ◽  
Xiao Guo ◽  
Zewei Zheng
Keyword(s):  
High Altitude ◽  
Design Optimization ◽  
Conceptual Design ◽  
Subspace Optimization ◽  
Concurrent Subspace Optimization

Concurrent Subspace Optimization Using Design Variable Sharing in a Distributed Computing Environment

1995 ◽  
Author(s):  
Brett A. Wujek ◽  
John E. Renaud ◽  
Stephen M. Batill ◽  
Jay B. Brockman
Keyword(s):  
Distributed Computing ◽  
Design Variable ◽  
High Performance ◽  
Low Cost ◽  
Multidisciplinary Design ◽  
Computing Environment ◽  
Subspace Optimization ◽  
System A ◽  
Implementation Studies ◽  
Concurrent Subspace Optimization

Abstract This paper reviews recent implementation advances and modifications in the continued development of a Concurrent Subspace Optimization (CSSO) algorithm for Multidisciplinary Design Optimization (MDO). The CSSO-MDO algorithm implemented in this research incorporates a Coordination Procedure of System Approximation (CP-SA) for design updates. Implementation studies detail the use of a new discipline based decomposition strategy which provides for design variable sharing across discipline design regimes (i.e., subspaces). The algorithm is implemented in a distributed computing environment, providing for concurrent discipline design. Implementation studies introduce a new multidisciplinary design test problem, the optimal design of a high performance, low cost structural system. A graphical user interface is developed which provides for menu driven execution and results display; this new programming environment highlights the modularity of the algorithm. Significant time savings are observed when using distributed computing for concurrent design across disciplines. The use of design variable sharing across disciplines does not introduce any difficulties in implementation as the design update in the CSSO-MDO algorithm is generated in the coordination procedure of system approximation (CP-SA).

A Parameter Investigation Into the Thompson Constant-Velocity Coupling

2011 ◽  
Vol 133 (12) ◽  
Author(s):  
I. T. Watson ◽  
B. Gangadhara Prusty ◽  
J. Olsen ◽  
D. Farrell
Keyword(s):  
Design Optimization ◽  
Closed Form ◽  
Dynamic Model ◽  
Conceptual Design ◽  
Constant Velocity ◽  
Spherical Geometry ◽  
Technical Note ◽  
Intermediate Shaft ◽  
Torque Transmission ◽  
Dynamic Forces

The Thompson coupling is a relatively recent design of constant-velocity coupling, that is, principally based on the double Cardan mechanism. An extra mechanism comprising a spherical pantograph serves to align the intermediate shaft of this coupling and so maintains the constant velocity of the double Cardan mechanism, in a modular fashion. This technical note serves to introduce basic closed form expressions for the coupling’s geometry—which may then be used to derive linkage accelerations and dynamic forces. The expressions are derived using standard identities in spherical geometry. The resulting dynamic model then informs a basic conceptual design optimization, which object is intended to reduce induced driveline vibrations, when the coupling is articulated at nonzero angles of torque transmission.

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