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This paper investigates the use of a new imaging system to measure the velocity and the mass flow distribution of fertiliser granules spread by a centrifugal device. The new acquisition system consists of a digital camera placed above the disc so that its view axis corresponds to the disc axle. This provides useful geometrical properties to develop a simple(More)
nt matter & 2007 IAgrE. temseng.2007.02.013 thor. Tel.: +1 217 333 2854; : grift@uiuc.edu (T.E. Gri This paper describes the development of a device capable of measuring the dynamic friction coefficient of particles accelerated in a tube spinning in a horizontal plane. The dynamic friction coefficient is not the classical Coulomb friction coefficient, but a(More)
In the context of centrifugal fertiliser spreading, numerous mechanical models demonstrate that the acceleration on the spinning disc depends on the friction coefficient of the fertiliser against the vane. Nevertheless, when the dynamic friction coefficient is measured by traditional methods, the values obtained do not reflect fertiliser behaviour(More)
This article reports a new approach to measure the velocity and the mass flow distribution of granules in the vicinity of a spinning disc in order to improve fertiliser spreading in agriculture. In this approach, the acquisition system consists of a digital camera placed above the disc so that its view axis corresponds to the disc axle. This provides useful(More)
Modern centrifugal spreaders use active control devices to manage various disturbances affecting the spreading uniformity on flat fields. Yet, non-flat fields that are also likely to cause application errors, are still not taken into consideration. This was highlighted in some experimental studies, limited to the case of single spread patterns on regular(More)
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