The aim of this report is to explain the work in WP H.3 of SILENCE. The scope of H3 was to implement selected noise reduction systems in a truck and to evaluate driver acceptance and potential noise reduction. This was done by a field study where drivers’ perception of noise reduction, design and acceptance was considered.
From an earlier questionnaire study there were two systems/functions that reached the highest level of acceptance among the participants. The functions were two hardware solutions, dual-mode engine and encapsulation of engine. In the focus group study, In-Vehicle Information Systems was proposed.
The systems, functions and concepts that was chosen for further development and later on implemented were those that gained the highest acceptance among the participants both in the focus group and questionnaire studies except for one. The dual engine or hybrid
technology was a hardware solution that was rated highest in the questionnaire study but was not later on implemented due to the lack of dual engine vehicle. This hardware solution is not tested within this project but is therefore not out of the discussion in noise abatement.
Based on the three sources of information (focus groups, questionnaire, and expert judgement) it was decided to implement the following four functions
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