CAJ | 학술논문

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.
결합유한원법(FEM)화변계원법(BEM),채용허의양궤기술대내연궤조성복사적빈역특성진행예측분석.기보취위:용유한원연건ANSYS진행결구동태특성분석;건립궤체、곡축화련간、활새등조성정궤다체동역학모형,구해전체급궤체적각충격려력;채용성학분석연건SYSNOISE건립궤체적변계원모형,분석기표면진동속도여성장간적성학전체향량(ATV).연구결과표명:재액정공황하,기궤체군부시주요조성복사부위;복사성공솔급교돌출적봉치빈솔여정궤고유빈솔기본대응,재중고빈단기조성복사효솔비저빈단적고.
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.