Doctoral Consortium 2013 Abstracts


Paper Nr: 2
Title:

Advanced Control Concepts Suitable for Energy Efficient Hydraulic Systems

Authors:

Tadej Tašner, Vito Tič and Darko Lovrec

Abstract: Today there are ever-increasing demands for more efficient hydraulic drive technology in terms of reducing energy consumption, increasing reliability plus robustness, and for minimising the maintenance interventions on the drive. In addition, the requirements and directives on the reduction of the noise, and development tendencies in the direction of environmentally user-friendly drives, are leading to an ever-increasing usage of the electro-hydraulic drive technology. There are two main concepts for converting electrical into hydraulic energy: constant speed motor coupled with variable displacement pump and variable speed motor coupled with constant pump. This article presents completed PhD tasks including modelling and simulation of both of the two concepts along with a new concept of variable speed motor coupled with constant pump. All the concepts are compared in dynamics and efficiency based on the simulation results. The expected results of the PhD are a newly-synthesized SIMO controller for ’bi-variable’ control, that will be able to control hydraulic systems in order to operate within the areas of maximum efficiency, highest dynamics or a compromise between these two. A further contribution to the hydraulic system developers’ community will be an experimentally proven mathematical model for the simulations of different hydraulic drive concepts. Such a model may be used for optimising the energy-efficiencies of existing and new hydraulic machinery, as well as efficiency prediction when building new hydraulic systems. Moreover it may also be used for determining the most suitable drive concept for a hydraulic system with a predefined operating cycle.

Paper Nr: 3
Title:

Towards Model-driven, Simulation-assisted Control Application Engineering - A Doctoral Research Path

Authors:

Timo Vepsäläinen

Abstract: This paper, intended to the doctoral consortium of the Simultech 2013 conference, describes the problems, methodologies, objectives and status of doctoral research of the author. The research conforms to the constructive approach of design science within the application domain of industrial automation and control. The focus of the research is on model-driven, simulation-assisted engineering of automation and control applications with consideration of both basic control and safety-related control systems. The general research question to be answered is whether or not automation and control application development can benefit from model-driven engineering and the techniques enabled by it. The answer will be based on answers to smaller research questions related to industrial applicability of the general developed modelling approach, ability to simulate models at design-time and ability to include safety documentation in models.

Paper Nr: 4
Title:

An Investigation on the Simulation Horizon Requirement for Agent based Models Estimation by the Method of Simulated Moments

Authors:

Ricardo Giglio

Abstract: The accurate estimation of Agent Based Models (ABM) by the method of simulated moments is possibly affected by the simulation horizon one allows the model to run due to sample variability. This work presents an investigation on the effects of this kind of variability on the distribution of the values of the objective function subject to optimization. It is intended to shown that, if the simulation horizon is not sufficiently large, the resulting distribution may present frequent extreme points, which can lead to inaccurate results when one tries to compare different models. For doing so, a model contest is carried out using different simulation horizons to assess the difference in goodness of fit when inactive traders are introduced in one of the Structural Stochastic Volatility models proposed by Franke (2009).