高层建筑消防安全疏散设计

频繁发生的高层建筑火灾不仅造成了大量的财产损失和人员伤亡,而且还造成了不良的社会影响。在分析高层建筑火灾特性的基础上,结合人员在火灾情况下的避难行为和影响安全疏散的因素,分析了高层建筑安全疏散的目标及方法、时间和对策,为高层建筑消防安全疏散设计提供参考。     

均匀设计在柴油无灰节能降污添加剂配方研制中的应用

基于低压氧弹燃烧法研究了充氧压力分别为0．6MPa和0．9MPa时两种无灰型柴油添加剂不同配比对助燃性能的影响。采用均匀实验设计和Matlab回归优化的方法，得到复配体系的最优配方，并对其进行了验证。结果表明，由Matlab回归分析得到的完全二次回归模型最理想，0．6MPa时由该模型得到的最优配方为：添加剂A和B的质量分数分别是0．300‰和0．700‰，并通过实验验证得到的发热量达到最大，变化率为8．697％。0．9MPa时，结合直观分析和回归分析，得到与实际相符的最优配方：添加剂A和B的质量分数分别是0．600‰和0．900‰，此时发热量皮化率为4．453％。     

The effects of model parameter deviations on the variance of a linearly filtered time series

We consider a general linear filtering operation on an autoregressive moving average (ARMA) time series. The variance of the filter output, which is an important quantity in many applications, is not known with certainty because it depends on the true ARMA parameters. We derive an expression for the sensitivity (i.e., the partial derivative) of the output variance with respect to deviations in the model parameters. The results provide insight into the robustness of many common statistical methods that are based on linear filtering and also yield approximate confidence intervals for the output variance. We discuss applications to time series forecasting, statistical process control, and automatic feedback control of industrial processes. © 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010     

高层公寓建筑防火设计探讨

高层公寓的火灾特点不同于普通的高层住宅，其火灾危险性高于普通住宅。分析了高层公寓的火灾特点，并从消防车作业面、安全疏散、防火分隔、防排烟、灭火设施、内装修等方面提出了高层公寓防火设计应注意的问题。     

满足大动压模拟要求的试验弹道优化设计

为了解决弹道导弹在高海拔发射场进行飞行试验时的大动压检验问题,提出一种模拟大动压条件的试验弹道设计方法。针对发射场的实际特点,建立残骸再入的动力学模型与落区边界模型;将大动压模拟条件转化为过程约束,提出一种主动段联合优化策略。基于自适应模拟退火算法,分别设计了三组满足不同大动压模拟条件和各项约束的试验弹道,并给出了对应的落区调整方案,验证了该方法的可行性。设计结果表明,最大动压主要出现在一级,一级最大负攻角增加,则最大动压也明显提高;同时调整发射方位角和二、三级程序角可以保证试验弹道满足弹头落点约束条件。     

The building evacuation problem with shared information

In this article, the Building Evacuation Problem with Shared Information (BEPSI) is formulated as a mixed integer linear program, where the objective is to determine the set of routes along which to send evacuees (supply) from multiple locations throughout a building (sources) to the exits (sinks) such that the total time until all evacuees reach the exits is minimized. The formulation explicitly incorporates the constraints of shared information in providing online instructions to evacuees, ensuring that evacuees departing from an intermediate or source location at a mutual point in time receive common instructions. Arc travel time and capacity, as well as supply at the nodes, are permitted to vary with time and capacity is assumed to be recaptured over time. The BEPSI is shown to be NP‐hard. An exact technique based on Benders decomposition is proposed for its solution. Computational results from numerical experiments on a real‐world network representing a four‐story building are given. Results of experiments employing Benders cuts generated in solving a given problem instance as initial cuts in addressing an updated problem instance are also provided. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

Estimating failure time distribution and its parameters based on intermediate data from a Wiener degradation model

Instead of measuring a Wiener degradation or performance process at predetermined time points to track degradation or performance of a product for estimating its lifetime, we propose to obtain the first‐passage times of the process over certain nonfailure thresholds. Based on only these intermediate data, we obtain the uniformly minimum variance unbiased estimator and uniformly most accurate confidence interval for the mean lifetime. For estimating the lifetime distribution function, we propose a modified maximum likelihood estimator and a new estimator and prove that, by increasing the sample size of the intermediate data, these estimators and the above‐mentioned estimator of the mean lifetime can achieve the same levels of accuracy as the estimators assuming one has failure times. Thus, our method of using only intermediate data is useful for highly reliable products when their failure times are difficult to obtain. Furthermore, we show that the proposed new estimator of the lifetime distribution function is more accurate than the standard and modified maximum likelihood estimators. We also obtain approximate confidence intervals for the lifetime distribution function and its percentiles. Finally, we use light‐emitting diodes as an example to illustrate our method and demonstrate how to validate the Wiener assumption during the testing. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

多机、多目标、超视距空战仿真系统研制

具有多机、多目标、超视距攻击特征的未来空战,其技术研究离不开仿真实验的强有力支持,完善的仿真系统是实现这一目标的重要基础和保证。本文着重对未来空战仿真系统设计研制的相关内容进行较为深入的讨论。采用ＲＦＭ、蛀孔式通信、系统集成、ＶＲ、动态视景生成等先进技术进行系统设计,同时,对关键技术进行了分析研究。     

先进武装直升机的一种新型组合智能火/飞综合控制系统的设计与仿真

讨论了模糊逻辑控制与神经网络相结合的一种控制方法,给出了一种增益自适应调整的模糊控制方法和ＢＰ网络自适应变步长学习算法。提高了系统精度,改善了系统品质,并将这种方法成功地用于直升机综合火／飞系统的设计。同时,针对某型直升机用数字仿真证明了这种方法的优点和良好效果。     

自整角机轴角智能采集电路的研制

设计研制了一种新的自整角机轴角智能采集接口电路．该电路应用于舰船自动航行系统,实现罗经、计程仪的航向、航速模数转换．它具有精度高、可靠性好、使用方便等一系列优点．