摘要
结合有限元法(FEM)和边界元法(BEM),采用虚拟样机技术对内燃机噪声辐射的频域特性进行预测分析。其步骤为:用有限元软件ANSYS进行结构动态特性分析;建立机体、曲轴和连杆、活塞等组成整机多体动力学模型,求解传递给机体的各种激励力;采用声学分析软件SYSNOISE建立机体的边界元模型,分析其表面振动速度与声场间的声学传递向量(ATV)。研究结果表明:在额定工况下,其机体裙部是主要噪声辐射部位;辐射声功率级较突出的峰值频率与整机固有频率基本对应,在中高频段其噪声辐射效率比低频段的高。
Adopting acoustic transfer vector(ATV)concept,the finite element method(FEM)and boundary element method(BEM)were combined to predict noise-radiation of the engine body.The procedures were as follows:The dynamics characteristic was analyzed with FEM software ANSYS,while the normal surface vibration exciting forces forwarded to the engine body were calculated based on multi-body dynamic model assembled by block,crankshaft,connecting rod,and piston.A BEM model was built in software SYSNOISE to calculate its ATV of the boundary vibration velocity to the sound field.Finally a 4-cylinder diesel engine SF480 was taken as an application example.The results show that the skirt part of the diesel engine is the main noise source at the speed in mid-high frequency domain,and the peaks frequencies are corresponded to the natural frequencies of the block.
出处
《中南大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2009年第5期1294-1298,共5页
Journal of Central South University:Science and Technology
基金
湖南省自然科学基金资助项目(07JJ6083)
关键词
柴油机
机体
噪声辐射
声学传递向量
边界元法
diesel engine
block
acoustic radiation
acoustic transfer vector(ATV)
boundary element method