Abstract:
The invention relates to a method and device for avoiding the deposition of particles of soot (3) on the insulating components (2) in an electrostatic filter (1), which comprises the insulating components (2). The method comprises the method step of creating a repulsive electrostatic field (4) around said insulating components (2), by placing at least one repulsive electrode (8) in or on at least one of the insulating components (2) and applying an adequate voltage to the repulsive electrode (8). The voltage difference between the repulsive electrode (8) and the central electrode (6) and the voltage difference between the repulsive electrode (8) and the peripheral electrode (7) creates an electrical repulsive field (4), which repulses the particles of soot having an electrical charge. The formation of a conducting channel (5) on the surface of said insulating components (2) between the central electrode (6) and the peripheral electrode (7) can thus be avoided.
Abstract:
A method for attenuating the low-frequency noise generated at the outlet (18) of an exhaust line (14). A signal representing the noise to be attenuated is defined; a first high-frequency acoustic wave (F1) is emitted from a first transducer (22) into an attenuation region (26) of the exhaust line (14), the first acoustic wave having a carrier frequency higher than 50 kHz; and a second high-frequency acoustic wave (F1+Δfcb) is emitted by a second transducer (24) into the attenuation region (26) of the exhaust line, the second acoustic wave having the carrier frequency of the first high-frequency acoustic wave (F1) and containing a low-frequency counter-noise signal (Δfcb) which is out of phase with the signal representing the noise to be attenuated.
Abstract:
A method for attenuating the low-frequency noise generated at the outlet (18) of an exhaust line (14). A signal representing the noise to be attenuated is defined; a first high-frequency acoustic wave (F1) is emitted from a first transducer (22) into an attenuation region (26) of the exhaust line (14), the first acoustic wave having a carrier frequency higher than 50 kHz; and a second high-frequency acoustic wave (F1+?fcb) is emitted by a second transducer (24) into the attenuation region (26) of the exhaust line, the second acoustic wave having the carrier frequency of the first high-frequency acoustic wave (F1) and containing a low-frequency counter-noise signal (?fcb) which is out of phase with the signal representing the noise to be attenuated.
Abstract translation:一种用于衰减在排气管(14)的出口(18)处产生的低频噪声的方法。 定义表示要衰减的噪声的信号; 第一高频声波(F 1)从第一换能器(22)发射到排气管线(14)的衰减区域(26),第一声波具有高于50kHz的载波频率; 并且由第二换能器(24)将第二高频声波(F 1 +αf c b N)发射到排气管线的衰减区域(26)中,第二声波具有 第一高频声波(F 1)的载波频率并且包含与表示要衰减的噪声的信号异相的低频反噪声信号(ΔfCb SUB>) 。