基于声全息法和单目视觉技术的柴油机噪声可视化实现

Realization of Diesel Engine Noise Visualization Based on Acoustic Holography and Monocular Vision Technology

柴油机属于多噪声耦合动力装置,其噪声的识别和控制是内燃机研究领域的难点。为实现柴油机噪声的可视化,本研究结合了近场声全息法与单目视觉技术,开发了基于Labview的声像匹配模块,测试系统人机界面友好,并通过已知声源试验验证了声像匹配模块的正确性。将验证后的测试系统应用于高压共轨柴油机对主/次推力侧声源进行识别,结果表明:在大气压力为80kPa、转速为1800r/min的最大扭矩工况下,主推力侧出现较大辐射噪声的位置为中冷器进气管、曲轴定时齿形带轮、排气管、脚架和涡轮增压器等;次推力侧辐射噪声峰值出现在起动机位置。

Diesel engine is a multi-noise coupling power plant,and its noise identification and control are difficult in the field of internal combustion engine research.In order to realize the visualization of diesel engine noise,this research combines near-field acoustic holography and monocular vision technology to develop a Labview-based sound-image matching module.The test system has a friendly human-machine interface,and the correctness of the sound-image matching module is verified by the known sound source test.The verified system was applied to a high-pressure common rail diesel engine to identify the primary/secondary thrust side sound source.The results show that under the maximum torque working condition of 80kPa at atmospheric pressure and 1800r/min,the places where large radiation noise appears on the main thrust side are the intercooler intake pipe,crankshaft timing toothed pulley,exhaust pipe,and Rack and turbocharger,etc.;the peak radiated noise on the secondary thrust side appears at the starter.