空调供风质量与客(滚)船舱室空气品质刍议

介绍了影响客(滚)船舱室内空气质量的各种因素,阐述了客(滚)船舱室室内空气品质的定义。通过实测,对三条航线的六艘船舶上不同等级客舱内的空气质量进行了调查分析,明确了影响舱室空气品质的主要因素为空调供风质量,并提出了改善的建议与措施。     

钦州港大榄坪散杂货泊位工程的环境保护措施

环境保护监理是近年来监理工程师的主要工作之一,文章通过对钦州港大榄坪1#、2#散杂货泊位工程施工中存在的环境问题进行分析,提出了防治环境污染的监理措施和方法。     

Enhanced, multi criteria based site selection to measure mobile source toxic air pollutants

A multi-criteria-based site selection process that was developed for the Las Vegas near-road study is used to select the most appropriate near-road measurement sites in the Detroit area. The study measures particulate matter with aerodynamic diameters ?2.5 μm and mobile source air toxic compounds, and to document the rationale for selecting or rejecting specific sites. An application of this multi-criteria decision analysis may be the recent US Environmental Protection Agency rule requiring the siting of NO₂ monitors within 50 m of major roads as well as siting for the measurement of community-wide NO₂ concentrations.     

Traffic models for goods,service and business movements to manufacturing establishments

This paper is concerned with a problem area of increasing interest, namely the traffic characteristics of specific generators located on non‐residential land use. It concentrates on the problem of modelling traffic generation for goods, service and business movements at the manufacturing establishment. Firstly the contributions of earlier researchers are reviewed in the context of factors which have been considered important. Then a further study conducted by the author in Sheffield and in Manchester, England, is described. This study considers more rigorously than hitherto the questions of similarities in trip rates over different manufacturing activities and geographical areas, and of the choice of explanatory variables. Comparison of regressions is used to formalize indications of similarities in trip rates, and analysis of variance for choosing the most satisfactory explanatory variables. The study provides evidence of similarity in trip rates over seven different manufacturing activities and two geographical areas. It also shows distinctions between different non‐work traffic types in the extent of similarities in trip rates over different manufacturing activities and in explanatory variables for traffic generation relationships. Regarding the latter it is concluded that it is not possible to model accurately such traffic movements on the basis of explanatory variables which are normally available. Instead trip rates should be expressed in simple mathematical terms and should be based on large data populations. The study also makes contributions on peak flow factors for the actual design of facilities of manufacturing establishments. These findings and others are discussed in the context of the work of earlier researchers. Finally conclusions are drawn and guidance offered for future work into this problem.     

气袋法测汽车内饰醛酮散发量的不确定度评定

依据测量不确定度评定与表示的方法,建立了气袋采样法测试汽车内饰件醛酮散发量不确定度评定的数学模型,并对测试过程中各不确定度分量的来源进行了分析和合成。结果表明,标准曲线的拟合、采样体积、充气体积、标液配制过程对测试结果有较大影响。通过增加曲线拟合的准确性,使用高精度的采样泵、流量计和流量矫正器保证采样体积、充气体积的精确性,选用合适的移液器具规范标液配制的操作,从而降低测量结果的不确定度,有利于提高检测的准确性和一致性。     

某轻型客车压缩机喷油故障分析及优化研究

针对某轻型客车空调系统压缩机喷油故障问题,利用环模试验,分析该系统压缩机喷油的根本原因是系统匹配设计问题,然后针对性地提出了改进措施,并通过整车环模试验,验证了其有效性。     

汽车空调结霜研究

本文根据汽车空调系统的工作原理分析了空调结霜的机理,根据系统原理对影响空调结霜的几种因素进行了阐述,介绍了空调系统结霜的评价方法.     

机油泵试验台的柔性设计

通过对多品种机油泵进出油道流向的分析,设计出新结构的涡壳和通道板;更换主动齿轮结构,以适应不同产 品传动齿轮中心距的变化;采用大小流量切换系统,适应不同产品流量的测试,实现了多品种产品出厂性能试验。     

车辆空气弹簧动力学参数特性研究

在车辆动力学模拟计算中,车辆动力学性能主要取决于悬挂参数的匹配,悬挂参数的精确度直接影响车辆动力学模拟计算误差。基于热力学及流体力学理论,建立空气弹簧的统一物理模型,导出其计算的统一数学表达式,提出了确定空气弹簧参数的计算方法,并对影响空气弹簧性能的因素进行了详细的分析。结果表明,空气弹簧气囊外形及刚度、附加气室容积和流孔直径是影响空气弹簧性能的主要因素。     

基于CFD的柴油机进气流动瞬态数值模拟与试验研究

采用经压缩修正的Jj}噌双方程湍流模型对一台车用4气门6缸柴油机的单缸换气过程、进气压缩过程进行了CFD瞬态模拟计算.结果表明,对于该柴油机,其气门叠开期发生了废气倒流入进气道现象;切向气道和螺旋气道的气流之间存在着相互影响;进气结束时在涡流以外还存在纵向的涡,在压缩行程中这些涡在高速转动的同时能量发生耗散.并将能量传递给周围流场,诱导出一个反方向的纵涡.气道稳流试验结果表明,对流量系数和涡流比的模拟计算结果与试验结果吻合较好.