摘要
以某柴油机缸盖罩为例,详细介绍了结合多体动力学,有限元法,边界元法以及拓扑优化技术的零部件低噪声设计流程。首先将整机多体动力学分析得到的缸盖罩螺栓处的位移响应作为激励,对其进行有限元强迫响应分析,得到缸盖罩节点的位移场,此结果作为边界元法声场分析的输入边界计算缸盖罩的辐射声功率及近场声强分布,与实测声强分布的吻合说明此方法的可行性,同时指明了对噪声贡献大的部位;利用Optistruct提供的拓扑优化技术,得到了降低辐射噪声的优化结构,优化后的缸盖罩总体声功率降低了3.5dB。
In this paper, taking a diesel cylinder＇s head cover as an example, the low noise design process for component parts is introduced. In this process, multi-body dynamics （ MBD）, FEM, BEM, and topology optimization are employed. At first, the whole engine is analyzed by means of MBD, and the displacement response of the bolts, which connect the cylinder and the head cover, is obtained. Tak- ing this displacement response as an excitation, the FEM analysis of the cylinder＇s head cover is carried out. The displacement field of the head cover is obtained. Then, taking it as input boundary condition, the sound-power radiation and sound-intensity distribution are calculated by means of BEM. The compu- tation results are consistent with measurement results. Therefore, this method is considered feasible. Meanwhile, the results point out the portions within the head cover which have large contributions to the noise. On this base, an optimal design of the head cover is derived using topology optimization technique supplied by Optistruct. After the optimization, the sound power of noise of the cylinder＇s head cover reduces 3.5 dB.
出处
《噪声与振动控制》
CSCD
北大核心
2009年第4期108-110,163,共4页
Noise and Vibration Control
关键词
声学
缸盖罩
有限元
边界元
声功率
拓扑优化
acoustics
cylinder head cover
FEM
BEM
sound power
topology optimization
