Apply Two Methods to Measure Engine Noise Source Identification

2014 ◽  
Vol 536-537 ◽  
pp. 259-263 ◽  
Author(s):  
Can Song Gu ◽  
Jun Hong Dong ◽  
Hui Gao
Keyword(s):  
Frequency Spectrum ◽  
Spectrum Analysis ◽  
Source Identification ◽  
Noise Source ◽  
Sound Intensity ◽  
Engine Noise ◽  
Frequency Spectrum Analysis ◽  
Noise Source Identification ◽  
Acoustic Array

Based on sound intensity and acoustic array methods, noise source identification of an engine is measured at idle condition. The main noise source of intake surface and exhaust surface are determined, also their frequency spectrum analysis. This two kinds of method testing results fundamentally agreed very well, and verify acoustic array method is more simple and easier than sound intensity method.

Noise Source Identification of the Grain Combining Harvester Based on Acoustic Array Test

2020 ◽  
Vol 36 (6) ◽  
pp. 879-890
Author(s):  
Yujun Shang ◽  
Chenglong Wang ◽  
Hongmei Xu ◽  
Shuang Liu ◽  
Wei Jiang ◽  
...  
Keyword(s):  
Source Identification ◽  
Noise Level ◽  
Noise Source ◽  
Noise Pollution ◽  
Rear Side ◽  
List Type ◽  
Frequency Range ◽  
Noise Source Identification ◽  
Combine Harvester ◽  
Acoustic Array

HIGHLIGHTSWe tested the noise of a grain combining harvester using a spiral acoustic array, aiming to identify its main sources and reduce its noise level.The noise of the harvester is mainly concentrated in the frequency range of 1 to 4 kHz.When the power of other devices is cut off, engine is the main noise source. While all devices are in normal working condition, the main source of noise is the header device and the intermediate conveying device.Abstract. The grain combine harvester is an important agricultural equipment with multiple functions of harvesting, threshing, separating, cleaning and grain gathering. As an instantaneous physical pollution, noise has become one of the main causes of modern civilization diseases. The noise generated by the operation of harvesters not only causes harm to the workers, but also leads to environmental noise pollution. Here, we tested the noise of a grain combine harvester using a spiral acoustic array, aiming to identify its main source by noise source identification technology based on the sound pressure distribution and reduce its noise level. The test results show that the noise of the harvester is mainly concentrated in the frequency range of 1 to 4 kHz. When the power of other devices is cut off, the engine is the main noise source, while under normal working conditions of all devices, the main source of noise is the header device and the intermediate conveying device on the front side of the harvester, the threshing device on the rear side, the engine and the threshing device on the left side, and the engine and the header device on the right side. Keywords: Acoustic array technology, Grain combining harvester, Noise source identification, Vibration and noise reduction.

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