板材成形数值模拟技术在汽车复杂冲压件生产中的应用

采用ＤＹＮＡＦＯＲＭ和ＬＳ－ＤＹＮＡ３Ｄ软件，对轿车行李箱内盖板、轻型车减振器支架、ＣＡ４８８发动机油底壳等几个复杂冲压件的成形过程进行数值分析，利用数值模拟技术成功地解决了这些零件在生产和测试中出现的质量问题。     

螺旋进气道铸造缺陷对气道性能影响的试验研究

在稳流气道试验台上，模拟了YC6108柴油机进气道倾斜、纵向胀大等铸造偏差，利用Ricardo和FEV气道性能评价指标，研究铸造缺陷如何影响进气道的性能。试验结果表明：进气道入口处向抬高，涡流强度减小，给向胀大使进气道的流量系数和涡流比明显降低，而当进气道既倾斜又胀大时，将进一步恶化气道性能。     

动力总成悬置元件特性对整车振动的影响

本文建立了轿车整车动力学模型，通过仿真计算和实车测试分析了怠速工况下液压悬置和橡胶悬置元件对整车振动的影响。试验测试结果与理论计算结果基本吻合，证明所建模型与分析方法是正确的，可用于分析轿车动力学问题。     

汽车点火器性能参数试验台的研制

介绍了所研制的汽车火控制器性能试验台的测量原理，该试验台榀进行点火控制器正常运行状态闭合率的测量、起动状态正常转换点频率的测量，起动状态闭合率的测量、熄火关断时间的测量、切断保护电压和钳位电压的测量等。     

电模拟汽车行驶阻力的汽车底盘测功机

论述了在汽车底盘测功机上检测汽车动力性和燃料经济性时，进行电模拟仿真汽车行驶工况阻力的必要性，介绍了一种国内新研制的电模拟汽车行驶阻力的汽车底盘电涡流测功机，并以车速表校验为例，叙述了操作过程和校验结果。     

沙漠车在塔克拉玛干沙漠牵引通过性能的试验研究

设计制造了一套沙漠车模引的电测试验装置，对浙江省车在塔克拉玛干沙漠中行驶时的驱动桥扭矩，挂钩力，动裁，车速，车轮轮速等参数进行了现场测量，得出了沙漠车在不同轮胎气压下的牵引系数，牵引效率和动阻力系试验结果对沙性性能的评价和改进具有指导意义。     

汽车噪声的模拟及其应用

介绍了采用“分频带数字滤波法”来模拟汽车噪声的原理及其主要参数的选择，并通过试验证了该模拟方法和模拟系统的可行性，由此建立的汽车噪声模拟系统可用于研究汽车噪声对人体的各种生理指标和化指标的影响规律。     

汽车制动功能失常故障树仿真建模与分析

本文采用Ｍｏｎｔｅ－Ｃａｒｌｏ随机抽样方法，建立汽车制动功能失常故障树仿真模型，编制出故障桎仿真程序ＳＦＴＡ，求出该系统的平均无故障工作时间、累积换效及各底事件重要度。同时借助于故障树仿真程序对系统进行可靠性分析，不仅能解决故障树分析中部件为非指数分布所遇到的困难，而且能够从仿真的运行过程中，观察到系统内部部各部分对整个系统可靠性所产生的作用，对于整体提高汽车制动系统的可靠性提供了有益的参考依据。     

The impacts of changing flight demands and throughput performance on airport delays through the Great Recession

Several significant events between 2007 and 2009 impacted flight demands and the abilities of the three major New York area airports to handle demand. This paper assesses the results of applying a probabilistic simulation method – which isolates the individual contributions of changes in flight demand and changes in airport throughput performance to changes in flight delays – to diagnose how these different events may have caused operational changes at these airports, and in turn, how the results may be used to inform policies for appropriate countermeasures. The analysis revealed two key observations. Firstly, certain patterns in throughput performance shifts caused the most significant delays, and were more likely to have been caused by controller staffing issues rather than caps. Secondly, relatively constant average delays from one year to the next may result from significant demand drops accompanied by large throughput performance degradations at an airport. This suggests that not only operational limitations on capacity encourage airlines to reduce schedules, but that changed demands can also impact throughput performance. Overall, the analysis indicates that caps may not have provided their fully intended delay benefits. Although they successfully reduced overall flight demands at LGA and JFK, they also directly limited throughput performance at critical times, in turn limiting delay benefits. In addition, demands at the busiest times of the day appear to be relatively inelastic to these operational limitations, insofar as demand profiles at EWR and JFK remained “peaky” in 2008 and 2009. Also, the recession was largely responsible for reducing demands at the airports in 2009, but the delay benefits of this were dampened by a corresponding throughput performance degradation. Based on the above observations, a more direct demand management policy combined with policies that focus on maintaining high staffing capabilities at critical times of the day may be considered, to reduce the likelihood of major queue formation on days that do experience sustained demands. The results also suggest that a more flexible caps system, particularly during times of heavy queues, could be explored. Although airport practitioners have keen understandings of how their airports operate, without the support of quantitative analysis tools, it can be more difficult to argue the need for appropriate countermeasures. An analysis such as the one presented here can provide the detailed quantitative substantiation required to build cases for these targeted policy directives and infrastructure investments.     

船舶柴油机数字式调速器仿真系统设计

文章以DGS8800e数字式调速器作为仿真对象,对调速器仿真系统的结构组成、调节器、执行器、监控系统以及监控面板进行了仿真设计。该系统界面友好、工作可靠且具有面向训练的功能特征,可以满足教学及海员适任证书培训评估的需要。