乘用车外观色差的控制

颜色的和谐均一是汽车产品特别是乘用车外观的主要特性之一,色差则是油漆的一种缺陷。目前,国内汽车业对于色差的控制尚未引起足够重视,也没有形成系统的理论,本文将介绍两大主流色差控制方法,并探讨分析色差产生的因素,提出相应的外观色差过程控制方法。     

声强法在磁悬浮列车车厢声源识别中的应用

介绍了声强法中P—P技术的使用,并讨论了在使用P—P技术进行声强测量时的相位匹配问题。利用声强法对磁悬浮列车行驶时车厢内的声源进行了识别,并从频率响应的角度对分析结果进行了判断。可以得出,磁悬浮列车以430 km／h速度行驶时,噪声主要通过车厢壁面传入车内。研究了各声强测点处1／3倍频程频谱,分析了各测点处辐射声强对车内噪声频率成分的贡献。可以得出,车厢壁面在100 Hz以下的频率贡献较大,而其它频段上,各测点的贡献相当。     

Valuation of externalities through neo-classical methods by including institutional variables

Externalities are uncompensated influences that are not expressed in a market but that affect the production possibilities or the welfare level of third parties. An example is the noise pollution in airport areas. Although air transport is an important source of economic growth and employment in many countries, the social and environmental problems connected with this sector are rising rapidly. Consequently, airports are becoming a matter of concern to many politicians. On what kind of values should they base their decisions as to further growth or consolidation of the current situation? In this paper we discuss two approaches, one based on mainstream, neo-classical, economics, and one based on institutional approaches, more in particular new institutional economics, which can be seen as a development complementary to the mainstream.     

利用Boussinesq方程对作用于大直径圆筒结构上的波浪力进行数值模拟

采用求解Beji和Nadaoka改进的Boussinesq方程,模拟了波浪在多个串连大圆筒结构前的反射,得到了作用于圆筒结构上的波浪力。空间离散采用有限元方法,可以较好地适应圆筒结构表面形成的复杂边界形状。数值模拟结果与公开发表的物理模型试验成果进行了比较,符合较好。     

Neptune轮机模拟器的功能及应用

介绍了NORCON公司研发的Neptune模拟器的主要功能及功能的设计方案,剖析了其搭建框架,分析其故障设置及评分体系的机理,从而阐述了先进模拟器的现状、发展水平及趋势。     

船舶操纵仿真中图谱数值化方法的研究

在船舶操纵仿真中涉及大量的图谱转换工作,传统的图谱处理方法在精度和工作量上存在着一对矛盾。本文试图通过应用正弦小波拟合方法来替代传统折线方法,并在某些图谱上得到验证,可望在类似图谱数值化上得到推广和应用,以提高计算精度和减少计算工作量。     

《钢结构设计规范》在起重扒杆设计中的应用

在起重船扒杆设计中，现行《船舶及海上设施起重设备规范》没有提供直接强度计算方法，容易导致强度计算缺乏统一标准和审图产生困难。作者认为，《钢结构设计规范》（GB50017）提供的有关计算会式可作为船舶工程中起重扒杆以及其它压弯构件的计算方法。     

防波堤建设期的风险管理与工程保险

由于防波堤所处的海洋工程环境、施工期间自身结构的相对薄弱性等,对防波堤建设期的风险进行分析、管理的研究对指导实际工程抵御风险有重要的意义。本文介绍了防波堤建设期面临的风险源、其风险如何去评价、如何通过风险管理有效地降低风险、通过工程保险的手段转移风险的内容、方法和目前的研究进展。     

膜电解法处理含镍废水的技术经济性能研究

采用单阴膜电解法对含镍废水进行处理，在理论分析的基础上研究了电解液pH值、Ni^2＋浓度、电流强度等影响因素。实验结果表明，对于pH值为0．5-1．0、Ni^2＋的平均质量浓度为1400mg／L的含镍废水，在电解电流150mA、电压5V的条件下，控制电解时间为20-24h，调节电解液初始pH值为4，采用离子交换法将Ni^2＋富集到14000mg／L时，平均电流效率可达到90．7％，镍的平均去除率为88．7％，可比普通电化学法电流效率提高30％，节能50％以上。     

Second-order perturbation added mass fluctuation on vertical vibration of tension leg platforms

Total motion in waves can be considered as a superposition of the motion of the body in still water and the forces on the restrained body. In this study the effect of added mass fluctuation on vertical vibration of tension leg platforms (TLP) in the case of vibration in still water for both free and forced vibration subjected to axial load at the top of the leg is presented. This effect is more important when the amplitude of vibration is large. Also this is important in fatigue life study of tethers. The structural model used here is very simple. Perturbation method is used to formulate and solve the problem. First- and second-order perturbations are used to solve the free and forced vibrations, respectively.