نویسندگان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
One of main factors that affects outputs, thermal efficiencies and lifetimes of the engine is "knock". Experimental results revealed that vibrating signals generated from knocks has certain frequencies related to vibration modes of the combustion chamber. In this paper, the behavior of the engine during different operating conditions has been simulated using the GT-POWER software. Based on simulation results, speeds of sound waves within the combustion chamber have been predicted at knock conditions. Then, a mathematical correlation was used to predict vibration frequencies based on the speed of sounds in the combustion chamber and cylindrical geometries. Vibration frequencies have also been measured experimentally using knock sensor data. Comparing simulation results with experimental data demonstrated an appropriate correlation between two methods and confirmed that the effect of other parameters on the vibration frequency could be negligible. Finally, a method for determining the occurrence and the severity of knocks and a threshold for the detection of this phenomenon has been proposed.
کلیدواژهها [English]
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