Surrogate-Assisted Online Optimisation of Cloud IaaS Configurations

2014 ◽  
Author(s):  
Kleopatra Chatziprimou ◽  
Kevin Lano ◽  
Steffen Zschaler
Keyword(s):  
Online Optimisation

Model-based online optimisation in simulation and on the engine test bench

MTZ worldwide ◽  
2007 ◽  
Vol 68 (1) ◽  
pp. 16-19
Author(s):  
Alexander Sung ◽  
Florian Klöpper ◽  
Alexander Mitterer ◽  
Georg Wachtmeister ◽  
Andreas Zell
Keyword(s):  
Test Bench ◽  
Engine Test ◽  
Engine Test Bench ◽  
Model Based ◽  
Online Optimisation

Model-based online optimisation of modern internal combustion engines

MTZ worldwide ◽  
2003 ◽  
Vol 64 (6) ◽  
pp. 30-32 ◽  
Author(s):  
Kosmas Knödler ◽  
Jan Poland ◽  
Thomas Fleischhauer ◽  
Alexander Mitterer ◽  
Stephan Ullmann ◽  
...  
Keyword(s):  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Model Based ◽  
Online Optimisation

scholarly journals Online simplification of water distribution network models for optimal scheduling

2013 ◽  
Vol 15 (3) ◽  
pp. 652-665 ◽  
Author(s):  
Daniel Paluszczyszyn ◽  
Piotr Skworcow ◽  
Bogumil Ulanicki
Keyword(s):  
Distribution Systems ◽  
Water Distribution ◽  
Distribution Network ◽  
Network Models ◽  
Water Distribution Network ◽  
Simplified Model ◽  
Reduced Model ◽  
Water Network ◽  
Pump Speed ◽  
Online Optimisation

This paper presents an implementation of an extended simplification algorithm of water distribution network models for the purpose of inclusion in the online optimisation strategy for energy and leakage management in water distribution systems. Whereas the previously proposed reduced model represented accurately the original hydraulic water network characteristics, the energy distribution in the simplified model was not preserved. This could cause a situation where the pump speed required to satisfy specified minimum pressure constraints is different for the reduced model and the original model. This problem has been identified, and an appropriate modification to the simplification algorithm has been introduced. The idea comprises introduction of the energy audit of the water network and the calculation of new minimum service pressure constraints for the simplified model. The approach allows the preservation of both hydraulic and energetic characteristics of the original water network and therefore meets the requirements of the online optimisation strategy. Suitability of the proposed approach is evaluated via a case study. The modern parallel programming implementation allowed water network models consisting of several thousand elements to be reduced within 2 min with an average relative accuracy of less than 2% in terms of tanks flows.

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