Agricultural Engineering Research, Volume 10 (1004)

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Browsing Agricultural Engineering Research, Volume 10 (1004) by Person "Van den Weghe, Herman"

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    Torque-Controlled Bottom Conveyor Velocity for the Application of Solid Manure : Effect of a DLC System on Longitudinal Distribution
    (2004) Kosch, Ralf; Klose, Andree; Van den Weghe, Herman
    To improve distribution accuracy during the spreading of solid manure and secondary raw material fertilizer in a longitudinal direction, a DLC (drive line control) system for solid manure spreaders has been developed. A control circuit allows the DLC system to keep the mass flow at the spreading elements constant. For the examination of distribution accuracy in a longitudinal and lateral direction, a spreading trial with collection trays was carried out. Three application rates (5 t, 10 t, 20 t ha-1 ) were examined both with and without the DLC system. The experimental set-up over a driving distance of 120m enabled more detailed insight into the quality of longitudinal distribution on a small scale and over the course of the unloading distance to be gained. The variation coefficients of lateral distribution (VKQ ) ranged between 11.7 % and 16.5 %. At values between 15.6 % and 35.7 %, the variation coefficients of longitudinal distribution (VKL ) were significantly higher both with and without the DLC system. In the test, the DLC system did not have any influence on VKL . Variability was rather caused by small- scale differences than by differences over the examined travel distance. Nevertheless, the DLC system means significant progress since it provides torque control independent of real driving speed, for example.
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    Tube Feeders for Piglet Rearing : A comparison of two tube feeders with regard to biological performance and behaviour of piglets
    (2004) Snell, Hinrich; Schmidt, Christine; Hüttmann, Burkhart; Van den Weghe, Herman
    Two types of tube feeders were compared. The first tube feeder (Lean- Machine, Big Dutchman, Vechta) featured a round trough. The feed was metered out through the movement of horizontally arranged bars above the trough. The second machine (PigNic, Big Dutchman, Vechta), how- ever, was equipped with a rectangular, three-bowl trough with a cen- trally arranged metering ring. The feed was significantly drier than in the variant used for comparison. At the LeanMachine tube feeder, more piglets were observed eating than in the other pens. However, this difference was not reflected by produc- tivity. At the LeanMachine, the piglets needed to eat more frequently in order to achieve the same body mass increase as in the other system. With regard to aggressive behaviour and intersucking, however, no sig- nificant differences could be determined.