Computer program is written for one rectangular enclosures and one car cavity, the results are compared with that given by the mode superposition method and experiment data respectively . the results show that the method is effective and feasible 以矩形封闭空间和某车体内腔为例进行了求解,其结果分别与模态迭加法计算结果及实验数据进行了对比,验证了模型的正确性。
Then, some proposals and methods are brought forward on the analysis of the causes of these kinds of noise . seeing that the noise radiates through the inlet of air and iron box, a silencer for the inlet and a rectangular enclosure are designed 针对加热器回风口和方箱是噪声向外辐射的必经途径,本文主要从消声器消声设计、方箱隔声设计两个方面出发,探讨了不改变加热器结构的降低噪声方法。
If rigid walls are assumed in the finite element model for the boundary panels, an eight node, isoparametric acoustic finite element model is developed for calculating the acoustic modes of cavities . initially a rectangular enclosure is analyzed in order to study the convergence of the results 利用8节点块体单元,在刚性壁条件下,对声场的基本方程进行数值求解,在jifex系统中发展了这种新的有限元模型,计算了封闭空腔的声学模态(固有频率和振型)。
A two-dimensional double diffusive laminar natural convection in rectangular enclosure is detailed analyzed . the results show that when the thermal and solutal buoyancies aid each other, the airflow consists of one main cellular structure and is steady, regardless of the relative strength variation between the heat and pollutant sources . there are multiple flow structures, however, according to the relative strength when the buoyancies opposing each other 模拟结果表明双扩散自然对流系统的空气流动与传热传质特性完全是由离散热源与污染源浮升力之间的相互作用关系诀定的:当离散热源与污染源浮升力协同作用时,自然对流呈比较稳定的单一流动结构;而当热源与污染源浮升力对抗作用时,自然对流系统随它们之间强度变化呈现出多种流动状态。