Hauling shortwood with farm tractor and forwarder. Approaches to study methods and modelling of productivity

摘要

In Sweden, grapple-loader trailers are common as hauling equipment for farm tractors, especially among self-employed woodlot owners. Knowledge of productivity and competitivity against forwarders is insufficient. Previous studies are mainly descriptive and do not give basic understanding of casual relationships. Relevant comparisons are difficult to make between machines because of e.g. varying operators and conditions. In this thesis an alternative approach to study and modelling productivity aiming at improving comparability between different machines and understanding of causal relationships is presented and discussed. 98 refs