干线公路城市过境方案决策的灰色格序方法

为科学合理地进行干线公路城市过境方案的决策,在已有研究的基础上,结合灰色关联法与格序决策法,提出了灰色格序决策方法.该方法在建立评价指标体系的基础上,采用极值法进行指标的无量化处理,应用熵值法确定指标的权重,并用灰色关联度来度量备选方案与理想方案之间的贴近程度.根据提出的方法,对干线公路G204盐城节点过境方案进行了比选,经分析发现,绕行式的过境模式虽然增加了过境车辆的绕行距离,但从工程经济、环境影响等方面综合考虑,仍不失为一种相对较优的过境方案.应用结果表明:灰色格序法综合了灰色关联法和格序决策法的优点,能更好地反映备选方案间的相对优劣关系.     

基于订单拆分的线上到线下连锁门店配送优化模型

针对零售企业线上到线下(Online To Offline, O2O)转型下连锁门店订单分配和配送问题，考虑门店商品种类、库存容量及客户退货等因素，提出只按商品种类而非数量进行拆分的订单拆分策略.以配送总费用最小为目标，构建基于订单拆分的O2O门店配送优化模型；设计包含线上订单就近分配和改进禁忌搜索的两阶段启发式求解算法，采用标准算例库中数据验证模型和方法的适用性和有效性.结果表明：与不拆分订单方法相比，订单拆分能够提高客户订单履约率，各门店商品总库存量不小于客户订单总需求量时，客户订单履约率达到100%.     

公交站点车辆停靠问题的最优控制模型与实现技术

本文从公交站点的停靠线路数和各停靠线路的运行特征着手,以各线路车辆合理、顺序、无延误地到达站点和从站点出发为优化目标,以公交站点的最大停靠能力和满足乘客的出行要求为约束建立优化模型,以确定各线路车辆在各时段的发车频率和依次占用站点停靠的时间段,并确定其合理的运行速度.最后通过某站点的调查数据来验证模型的实用性.     

Modified environmental contour method for predicting long-term extreme responses of bottom-fixed offshore wind turbines

Predicting extreme responses is very important in designing a bottom-fixed offshore wind turbines. The commonly used method that account for the variability of the response and the environmental conditions is the full long-term analysis (FLTA), which is accurate but time consuming. It is a direct integration of all the probability distribution of short-term extremes and the environmental conditions. Since the long-term extreme responses are usually governed by very few important environmental conditions, the long-term analysis can be greatly simplified if such conditions are identified. For offshore structures, one simplified method is the environmental contour method (ECM), which uses the short-term extreme probability distribution of important environmental conditions selected on the contour surface with the relevant return periods. However, because of the inherent difference of offshore wind turbines and ordinary offshore structures, especially their non-monotonic behavior of the responses under wind loads, ECM cannot be directly applied because the environmental condition it selects is not close to the actual most important one.The paper presents a modified environmental contour method (MECM) for bottom-fixed offshore wind turbine applications. It can identify the most important environmental condition that governs the long-term extreme. The method is tested on the NREL 5 MW wind turbine supported by a simplified jacket-type support structure. Compared to the results of FLTA, MECM yields accurate results and is shown to be an efficient and reliable method for the prediction of the extreme responses of bottom-fixed offshore wind turbines.     

基于最佳阶次FRFT的阶比分量提取

为在变速器故障诊断中提取微弱的故障特征,提出了一种基于转速信号确定分数阶傅里叶变换(FRFT)最佳阶次,并通过滤波提取变速器变速过程啮合阶比分量的方法。首先,根据输入轴转速信号和传动比,计算各挡位啮合频率分量,接着进行最小二乘拟合,以确定各分量FRFT的最佳阶次,最后在该最佳分数阶域进行滤波,获得对应的阶比分量。试验结果表明,根据转速信号确定FRFT最佳阶次,准确、快速、鲁棒性好,并具有自适应性;最佳阶次FRFT滤波能有效剥离其他分量和噪声,提取出目标阶比分量;对目标阶比分量进行单分量分析,能得到该分量更全面、细致、准确的信息。     

多聚磷酸与SBS复合改性沥青改性工艺研究

研究了多聚磷酸（PPA）掺量、发育温度、发育时间、PPA添加顺序对多聚磷酸与SBS聚合物复合改性沥青改性性能和储存稳定性的影响。根据本文的研究结果,推荐PPA与SBS复合改性沥青的最佳PPA掺量为0．5％-1．0％,最佳发育温度为170℃。在生产PPA与SBS复合改性沥青时,首先应加入SBS改性剂,待SBS溶胀后再加入PPA,如此复合改性沥青可获得较好的使用性能和储存稳定性。     

航空发动机后续订货模型研究

根据航空发动机的使用和翻修过程,建立了发动机后续订货模型,该模型综合考虑了翻修期、提前换发率、发动机到寿等因素,为航空发动机及其他航空有寿件的订货和管理以及航空产品备品备件订货模型的进一步研究提供了参考和依据.     

Extreme value prediction of nonlinear ship loads by FORM using Prolate Spheroidal Wave Functions

In this study, a method for predicting the extreme value distribution of the Vertical Bending Moment (VBM) in a flexible ship under a given short-term sea state is presented. The First Order Reliability Method (FORM) is introduced to evaluate the Probability of Exceedances (PoEs) of extreme VBM levels. The Karhunen-Loeve (KL) representation of stochastic ocean wave is adopted in lieu of the normal wave representation using the trigonometric components, by introducing the Prolate Spheroidal Wave Functions (PSWFs) to formulate the wave elevations. By this means, reduction of the number of stochastic variables to reproduce ocean wave is expected, which in turn the number of computations required during FORM based prediction phases is significantly reduced. In this study, the Reduced Order Model (ROM), which was developed in our previous studies, is used to yield the time-domain VBMs along with the hydroelastic (whipping) component in a ship. Two different short-term sea states, moderate and severe ones, are assumed. The FORM based predictions using PSWF for normal wave-induced VBM are then validated by comparing with those using the normal trigonometric wave representation and Monte Carlo Simulations (MCSs). Through a series of numerical demonstrations, the computational efficiency of the FORM based prediction using PSWF is presented. Then, the validation is extended to the severe sea state where the whipping vibration contributes to the extreme VBM level to a large degree, and finally the conclusions are given.     

对外汉语学科建设中的汉日语法对比研究

试将汉日语法对比研究放在对外汉语学科建设中来认识这项研究的实际意义。通过汉日语法对比研究，揭示汉日语法的共性和特性，从而深化对汉语本体的研究，并将研究成果融入对日汉语教学，使教学向更科学化的方向发展。     

面元法预估导管螺旋桨定常性能的一种简便方法

用基于速度势的低阶面元法建立预估导管螺旋桨定常性能的计算方法,即对导管和螺旋桨都采用面元法,在计算面元的影响系数时计入导管和螺旋桨的相互影响。将对JD简易导管桨的计算与实验结果进行比较表明,该方法可以有效地应用于导管桨的定常性能计算。