Exhaust Noise Analysis Research for a Single-Cylinder Diesel Engine and Evaluation of Noise Filtration by Simulation

Abstract

The paper develops an ana lysis of exhaust noise for a single-cylinder diesel engine tested in laboratory conditions. The acoustic signal at the engine exhaust system, for the speed range 1,300 – 2,700 rpm was measured and recorded. The results of the noise recordings were subjected to a processing from which the variation of the noise level depending on the engine speed was obtained. Next, the physiological effect of acoustic filtrations for noise recordings was analyzed by simulation. This allowed the optimization of the exhaust noise, having identified the areas and the optimal attenuation effect. In the performed simulations, it was found that the low frequencies require the highest attenuation background.

Studies on the Development of a Reliability Diagnosis for Agricultural Tractors Gearboxes

“…The transmission of the moment from the gearbox to the dynamic brake is accomplished with a planetary coupling (5) equipped with an elastic bush (6) and a lowfrequency vibration attenuator (7). The dynamic brake (8) is a direct current motor, with a power of 4 kW, 220 V, used as a generator, which ensures the conversion of mechanical work into electrical energy, thus, making it possible to determine the power losses in the gearbox (9) (Golgot et al, 2021).…”