For engines with turbochargers, due to the generally high rotational speed of the turbocharger, the intake noise is significantly higher than that of non-turbocharged engines. The noise from the turbocharger is caused by the rotational noise generated as the blades periodically cut through the air and the turbulent noise formed by the high-speed airflow. It is a continuous high-frequency noise, mainly distributed in the frequency range of 500~10,000 Hz. Currently, most of our company's engines adopt turbocharging.
As communication diesel generator sets, they must meet the requirements specified in GB2820-1997 for G3 or G4 levels, as well as the 24 performance index requirements stipulated in the "Detailed Rules for Implementation of Quality Certification Testing for Communication Diesel Generator Sets." They also need to pass the strict inspection conducted by the quality supervision and inspection center established by the relevant industry authorities for communication power supply equipment.
As military communication diesel generator sets, they must comply with the provisions of GB2820-1997, GJB related standards, and the "Quality Inspection Standards for Communication Power Supply Equipment" formulated by the relevant departments of the armed forces, and pass the strict inspection of equipment quality organized by the relevant organizational departments.
Exhaust noise is the main sound source of engine noise, which is generally 10~15dB(A) higher than the overall noise of the engine. Engine exhaust belongs to high-temperature (800~1000℃), high-pressure (3~4 atmospheres) gas. The exhaust process is generally divided into two stages: the free exhaust stage and the forced exhaust stage. Engine exhaust gases are discharged at high speed from the exhaust valve, travel along the exhaust manifold into the muffler, and are finally discharged into the atmosphere through the tailpipe, generating broadband exhaust noise during this process.
Exhaust noise contains complex noise components: exhaust noise with the number of exhausts per unit time as the fundamental frequency, air column resonance noise in the pipe, airflow blowing noise at the exhaust manifold, waste gas injection and impact noise, Helmholtz resonance noise of the cylinder, Karman vortex noise, and turbulent noise inside the exhaust system.
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