维纳滤波器在燃烧噪声分离中的应用  

Application of Wiener Filter in Separating Combustion Noise

作　　者：董阳 张良良 高文志[1] 贺红 付振 DONG Yang;ZHANG Liangliang;GAO Wenzhi;HE Hong;FU Zhen(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;GAC R&D CENTER,Guangzhou 511400,China)

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]广汽研究院,广州511400

出　　处：《机械科学与技术》2023年第7期985-992,共8页Mechanical Science and Technology for Aerospace Engineering

摘　　要：目前分离内燃机燃烧噪声常用的方法主要有传递函数法、多元线性回归法,这两种方法均将内燃机的总噪声分为燃烧噪声和机械噪声两部分,并且假设实验获得的倒拖噪声为机械噪声,以此达到分离燃烧噪声的目的。然而上述两种方法所得到的燃烧噪声中还包含活塞敲击所形成的间接燃烧噪声。本研究测取了某汽油机转速为4500 r/min和2000 r/min转速下多个负荷工况的总噪声、缸压和振动数据,并利用-15~85℃A ATDC的时间窗对测量信号进行了截取,基于倒拖法将机械噪声分离。利用缸压信号和燃烧噪声信号构建了维纳滤波器对燃烧噪声进行了滤波,实现了直接燃烧噪声和间接燃烧噪声的分离。计算结果表明该汽油机活塞敲击产生的间接燃烧噪声主要集中于500~8000 Hz的频率段。The most widely used noise-separating methods are transfer function method and multiple linear regression method.Both methods consider that the total engine′s noises include two categories,combustion and mechanical noises,by which the motor noise are hypothetically considered as mechanical noise.However noises from these two methods still comprise indirect combustion noise as a result of piston slapping as well.This research is conducted under the condition of 4500 r/min and 2000 r/min to acquire the total noises,cylinder pressure and vibration data of a gasoline engine,which also uses the time window of-15-85℃A ATDC to cut out the target signal and then separate the mechanical noise under motor test.The signal of cylinder pressure and combustion noise help to develop Wiener filter to apply to combustion noise so that it can achieve the separation between indirect and direct combustion noises.The result proves that most of the indirect noise are in the region of 500-8000 Hz.

关 键 词：汽油机 直接燃烧噪声 间接燃烧噪声 维纳滤波 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]