基于FE-SEA混合法的机舱内中频噪声预测技术

Prediction technology of medium frequency noise in engine room based on fe-sea hybrid method

摘要:

为充分降低机舱中频噪声的振荡频率，获得更加精确的频段波分析结果，提出一种基于FE-SEA混合法的机舱内中频噪声预测技术手段。按照原理参数的获取现状，划分机舱子系统中的节点属性结构，完成FE-SEA混合法的建模处理。在此基础上，筛查频段中的所有共节点，根据中频孔洞的密封原理，建立标准的噪声腔子系统，再联合各项预应连接结构，实现机舱中频噪声的预处理。分别从频段精度、子系统稳定性、噪声损耗因子、传输路径四个方面，分析FE-SEA混合法对噪声预测的控制条件，实现机舱内中频噪声预测手段的顺利应用。实用分析结果表明，与SEA方法相比，FE-SEA混合法预测技术可将机舱中频噪声振荡频率稳定在100Hz左右，对频段波精确分析起到适当促进作用。

Abstract:

In order to reduce the oscillation frequency of the medium frequency noise in the engine room and obtain more accurate wave analysis results, a FE-SEA hybrid method was proposed to predict the medium frequency noise in the engine room. According to the acquisition status of the principle parameters, the node attribute structure in the engine room subsystem was divided, and the fe-sea mixed modeling process was completed. On this basis, all common nodes in the frequency band are screened, a standard noise cavity system is established according to the sealing principle of intermediate frequency holes, and then all pre-connected structures are combined to realize the pretreatment of intermediate frequency noise in the engine room. In this paper, the control conditions of fe-sea hybrid method for noise prediction are analyzed from four aspects of frequency band accuracy, subsystem stability, noise loss factor and transmission path, respectively, so as to realize the smooth application of if noise prediction method in engine room. The results of practical analysis show that compared with SEA method, fe-sea hybrid prediction technology can stabilize the oscillation frequency of medium frequency noise in the engine room at about 100hz, which plays a proper role in promoting the accurate analysis of frequency band waves.