ebm-papst

About: ebm-papst is a company organization based out in Mulfingen, Germany. It is known for research contribution in the topics: Rotor (electric) & Stator. The organization has 572 authors who have published 736 publications receiving 3763 citations.

Radial impeller for a drum fan and fan unit having a radial impeller of this type

Abstract: An impeller has an inlet and outlet A bottom disc has an external diameter A top disc concentric to the bottom disc at an axial distance therefrom has a suction opening for the inlet A plurality of forward-curved blades are arranged between the bottom disc and the top disc A flow channel has an inner inlet side and an outer outlet side formed between adjacent blades The channel is curved convexly viewed in the running direction of the impeller The external diameter of the bottom disc is at least 20% greater than the internal diameter of the suction opening The top disc forms a guiding surface and an angle is formed between a tangent on the guiding surface at the inlet to the suction opening and a tangent on the guiding surface at the outlet from the flow channel on the air outlet side is at least 30°

Ventilatorrad und Ventilator

Abstract: Ventilatorrad ausgefuhrt als Radialventilatorrad oder Diagonalventilatorrad, mit einer Vielzahl von um eine axiale Rotationsachse verteilten Ventilatorschaufeln, einer im Radialschnitt bogenformigen Deckscheibe, die mit ihrer Unterseite zumindest abschnittsweise auf axialen Stirnseiten der Ventilatorschaufeln aufliegt und um die Rotationsachse eine Einlassoffnung aufweist, wobei die im Radialschnitt bogenformige Deckscheibe einen radialen Innenabschnitt, in dem ein Tangentenwinkel gegenuber einer Radialebene des Ventilatorrades groser ist als 45°, und einen sich in radialer Richtung an den Innenabschnitt anschliesenden Ausenabschnitt aufweist, dadurch gekennzeichnet, dass im Innenabschnitt auf der der Unterseite gegenuberliegenden Oberseite der Deckscheibe mindestens ein von der Oberseite der Deckscheibe radial und axial vorstehendes Luftleitelement mit einer in Umfangsrichtung weisenden Leitflache angeordnet ist.

Pneumatischer verbund mit massenausgleich

Abstract: Geblasevorrichtung zur Forderung mindestens eines Mediums umfassend ein Geblase mit Gehause mit einem Einlass und einem Auslass, eine Duse, die derart stromungsverbunden an dem Gehause angeordnet ist, dass sie von dem mindestens einen Medium durchstrombar ist, wobei die Duse ausgebildet ist, zumindest abschnittsweise einen Unterdruck des mindestens einen Mediums zu bewirken, mindestens einen Sensor, wobei der Sensor im Wirkungsbereich der Duse angeordnet und ausgebildet ist, zumindest Parameter des mindestens einen Mediums zu messen, die zur Bestimmung der Masse des mindestens einen Mediums notig sind.

Beamforming for measurements under disturbed propagation conditions using numerically calculated Green's functions

Abstract: Beamforming methods for sound source localization are usually based on free-field Green's functions to model the sound propagation between source and microphone. This assumption is known to be incorrect for many industrial applications and the beamforming results can suffer from this inconsistency regarding both, accuracy of source power estimation, and accuracy of source localisation. The aim of this paper is to investigate whether the use of numerically calculated Green's functions can improve the results of beamforming measurements. The current test cases of numerical and experimental investigations consists of sources placed in a short rectangular duct. The measurement is performed outside the duct in a semi-anechoic chamber. A typical example for this kind of installation is a fan with a heat exchanger. The Green's functions for this test case are calculated numerically using the boundary element method. These tailored Green's functions are used to calculate the corresponding beamforming steering vectors. The weighting of the Green's functions in the steering vectors has a decisive influence on the beamforming results. A generalization of the common steering vector formulations is given based on two scalars. It is shown that arbitrary differentiable Green's functions can be used to find the correct source position or source power level by using the appropriate steering vector formulations. Beamforming measurements are performed using a loudspeaker as a reference source at different positions in the heat exchanger duct. The measurements are evaluated in the frequency domain and by means of different validation criteria it can be shown that the results with the numerical calculated Green's function are improved compared to free field beamforming especially at low frequencies.

Gas control unit of modular design and modular gas control valve

Abstract: The invention relates to a gas control unit of modular design, in particular for controlling the quantity of gas to be fed to a gas burner, having a pneumatically controlled gas control valve that is configured as a whole as a module and is usable in such a gas control unit of modular design together with a gas safety valve.