An alternative approach to surrogate averaging for a centrifugal impeller shape optimisation Online publication date: Wed, 07-Dec-2016
by Sayed Ahmed Imran Bellary; Abdus Samad
International Journal of Computer Aided Engineering and Technology (IJCAET), Vol. 9, No. 1, 2017
Abstract: A major concern regarding surrogate model-based design optimisation is the modelling fidelity of the approximation functions. This issue is efficaciously addressed by utilising multiple surrogates based on the same data to offer approximations from alternative modelling perspective. The approach is introduced to optimise performance of a centrifugal impeller as a case study. The basic surrogate models adopted here include response surface approximation, radial basis neural network, Kriging, support vector machine and Shepard method. A weighted average and a new weighted average surrogate models were constructed from the basic surrogates and implemented in the present problem. A hybrid genetic algorithm was used to explore the optimal points. Design variables from the impeller inlet and exit blade angles were selected and design of experiments were used to select the sample points from the design space. The aim of the optimisation was to maximise hydraulic efficiency and head generated. The optimised centrifugal impeller yielded lower losses by altering the vane angles. It was found that the most accurate surrogate did not always lead to the best design. This manifested that using multiple surrogates can improve the robustness of the optimisation at a minimal computational cost.
Online publication date: Wed, 07-Dec-2016
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Computer Aided Engineering and Technology (IJCAET):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email email@example.com