Reno Filla

Hybrid Power Systems for Construction Machinery: Aspects of System Design and Operability of Wheel Loaders

This paper will examine the wheel loader as a system with two parallel energy conversion systems that show a complex interaction with each other and with the power source. Using a systematic design ...

Study of a method for assessing operability of working machines in physical and virtual testing

In this study of 18 wheel loader operators, test-driving a machine in three different traction force settings, we found strong support for the hypothesis that the operator’s control commands can be used to assess the machine’s operability, at least in form of ease of bucket filling. The methods chosen to derive the control effort worked well and were computationally efficient.

A Methodology for Modeling the Influence of Construction Machinery Operators on Productivity and Fuel Consumption

This paper is concerned with modeling the actions of a human operator of construction machinery and integrating this operator model into a large, complex simulation model of the complete machine and its environment. Because human operators to a large degree affect how the machine is run, adaptive operator models are a necessity when the simulation goal is quantification and optimization of productivity and energy efficiency. Interview studies and test series have been performed to determine how professionals operate wheel loaders. Two models using different approaches were realized and integrated into a multi-domain model for dynamic simulation. The results are satisfactory and the methodology is easily usable for other, similar situations.