Auralization in small enclosures is a process of rendering audible , by modeling the sound field which size is close to sound wavelength . auralization could be used to simulate sound in the design phase of small enclosures 小尺度封闭空间可听化是指在几何尺寸与声波波长相当的封闭空间内，通过对声场空间建模再造听音效果的过程。
Mi5 operatives suspect that al - qa ' eda sympathisers intended to produce a nerve agent - probably sarin - and release it in a confined space , such as a tube carriage , to maximise the number of casualties 英国军情5处怀疑， “基地”恐怖组织追随者试图制造出一种神经性制剂，可能是沙林，然后把它在一个封闭空间，比如地铁列车车厢释放，以使伤亡人数最大化。
Furthermore , the author discussed the to vision character and constructing methods of 6 types of lakefront landscapes include open space , half open space , closing - space , cover - space , deep - space and mix - space 在此基础上，论述水际客观存在的由植物构建的开敞空间、半开敞空间、封闭空间、覆盖空间、纵深空间和混合空间等六种空间类型的视觉特点、营造方法与心理感受。
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。
The key problems for auralization of small enclosed - room are pointed out , that are , how to realize three modeling tasks of auralization based on wave acoustics , how to solve the consuming of big capability memory and long calculating time 指出了实现小尺度封闭空间可听化的关键问题是如何基于波动声学实现可听化的三个建模过程、并解决大容量内存消耗以及较长计算时间。
2 ) in order to solve the scattering and diffraction of sound radiation , in this dissertation , based on helmholtz equation and its boundary equations , modeling of three - dimensional fem is given for computing low frequency sound transfer function in small enclosures 2 )为解决声音在传播过程中所发生的散射和衍射现象，本文基于有源helmholtz方程及其边界条件，建立了求解小尺度封闭空间内低频声传递函数的三维有限元模型。
This paper analyses the heat absorption and evaporation process of the droplet , the combustion characteristic of motor spirit and ethanol motor spirit , and oxygen concentration of motor spirit and ethanol motor spirit was measured from burning to self extinguishing in the enclosed space 摘要分析了细水雾灭火时液滴的吸热蒸发过程和汽油与乙醇汽油的燃烧特性，进行了汽油、乙醇在封闭空间内从燃烧到自行熄灭时的含氧量变化测量。
At present , auralization software and research fruit based on geometrical acoustics ca n ' t solve problems above . in this dissertation , the finite element method ( fem ) and adaptive finite element method ( afem ) to auralization in small enclosures are presented . relative problems are studied and some effective approaches for the problems " settlements are given 本文将波动声学为理论基础的有限元法( finiteelementmethod ，简称fem )及自适应有限元法( adaptivefiniteelementmethod ，简称afem )成功地引入到小尺度封闭空间可听化研究中，对相关问题进行了深入研究，提出了一系列解决问题的有效方法。
1 noise : the greatest volume of noise normally occurs on straight sections when trains pass at their highest speed . whereas noise from mrt trains is masked by the background noise of heavy daytime traffic , at nighttime the level of noise is significantly more obvious . on curved sections and cornered sections and on sections close to stations , the impact of noise on the neighborhood is much lower 以列车行进于地下隧道段时，轮轨滚动噪音经封闭空间所传回车厢，使乘客感受到的噪音，与列车行驶于平面、高架及出土段时，沿线非乘客感受到的移动式空传噪音最为迫切有待解决之课题；
People usually encounter many kinds of small enclosures , such as small meeting room , living room , working room , car cavity , plane cabin and submarine chamber etc . as a result , in order to improve sound environment , reduce products noise , cut cost of manufacturing sample machine and design time , many companies are urgent to simulate interior sound of products with auralization before products are manufactured 在实际生活和工作中，人们常会遇到许多小尺度封闭空间环境，例如，小型厅堂、居室、工作间、轿车车厢、飞机舱室、潜水艇舱室等等。因此，除建筑声学领域之外，许多汽车、飞机、船舶公司也急需在产品制造出来之前，利用小尺度封闭空间可听化模拟产品内部的声学环境以便于改善听音环境、降低内部噪声，从而节省了制造样机的成本、缩短了设计开发周期。
