Comparison of Loaded and Unloaded Noise Test Methods Within the Scope of Annexe XIII of EU/1322/2014

Abstract

In this study, test methods for measuring noise levels in the driver's ear in Annexe XIII of EU/1322/2014, one of the delegated regulations of the type-approval regulation EU/167/2013, which determines the production and market-supply conditions of agricultural tractors, were compared. Tractor noise levels, an area where manufacturers continuously strive to improve user health and comfort, are measured using two different methods under the regulation: Test Method 1 and Test Method 2.

The researchers measured noise levels in the driver's ear for five different tractors using two methods, then compared the resulting values and test procedures. The tractors have similar dimensional measurements and the same protective structure, but they have three different engines.

In this study, the researchers compared the two methods specified in the regulation and evaluated the results for tractors equipped with different engines. They examined how engine type influences noise levels in the driver's ear under various operating conditions and identified the most suitable engine. In addition, the researchers observed how the noise level of tractors changes when the machines operate under load.

The results of the study revealed that Method 1 requires more equipment than Method 2, has a longer, more complex testing process, and involves greater difficulty in applying load to the tractor. The testing team evaluated the results and ranked the tractors under load according to Method 1 as Tractor E > Tractor B = Tractor D > Tractor A > Tractor C. They also ranked the tractors without load according to Method 2 as Tractor A = Tractor C > Tractor E > Tractor B > Tractor D. Considering that farmers typically use tractors under load during fieldwork, these results indicate that selecting a tractor using Engine Type 1 would result in lower noise exposure.