Machine Troubleshooting - CEM Noise Meter
Modern industrial production can not be separated from the machine, and the machine application engine often produces a variety of noise, in the promotion of environmental protection production now, the use of noise meters for noise control, become one of the necessary methods of noise control.
For the selection of noise meter to be differentiated, measuring different environments should use different types of noise meter, Guangzhou Hongcheng launched a series of professional noise meter, such as noise meter is suitable for measuring the temperature of the community, school, home environment noise; noise meter is particularly suitable for measuring mechanical industrial noise, etc., a series of noise meter can be widely used in noise engineering, quality control, health prevention and control, and a variety of environment between sound Measurement, such as residential areas, industrial and mining plants, schools, airports and other occasions of noise measurement applications.
Machinery production for noise control, when the engine noise is too loud for troubleshooting, you can use the noise meter for the first check, such as produced by the air compressor and the extractor, do not mistake these noises for engine noise, remove the accessory drive belt to exclude the noise caused by these devices. Noise can also propagate to metal parts that are otherwise free of problems, so using a noise meter stethoscope will help determine the location of the noise producing **motor**.
Arrive at each measurement location with a portable noise meter in hand and hear a noise that varies with crankshaft speed (engine speed), the noise may be related to the crankshaft, connecting rods, pistons, and piston pins. According to the change of noise data on the noise meter, if the noise changes with the camshaft speed (half speed of the engine), the noise may be related to the valve transmission components. A hand-held digital noise meter can help determine if the noise is related to a component that operates at the speed of the crankshaft or camshaft.
Engine-driven components and accessories such as gear-driven fan clutches, hydraulic pumps, belt-driven chargers, air conditioning compressors, and superchargers can all contribute to engine noise. Using a noise meter for assistance, the following information can be used to guide the diagnosis of engine noise:
Main Bearing Noise: Knocking noise from a loose main bearing can be heard when the engine is under load; it is loud and dull. This noise is loudest when the engine is dragging under load or traveling under heavy load This knocking sound is duller than the noise produced by the connecting rod. Using Guangzhou Hongcheng noise meter for measurement, can be selected A, C gear, the use of A gear to measure the audio lower noise, C gear to measure the high-frequency noise, and the data can be stored, easy to connect to the computer to analyze and investigate the source of the noise.
