Optimized Fuzzy Clustering Method for Health Monitoring of Shield Tunnels

Since health monitoring of shield tunnels generally employs multiple sensors belonging to different types,a fine analysis on massive monitoring data,as well as further quantitative health grading,is really challenging.An optimized fuzzy clustering analysis method based on the fuzzy equivalence relation is proposed for health monitoring of shield tunnels.Clustering results are auto-generated by using fuzzy similarity-valued map.The results follow the idea of unsupervised classification.Moreover,a convenient new health index HI is proposed for a fast tunnel-health grading.A case study on Nanjing Yangtze River Tunnel is presented to validate this method.Three types of indicators,namely soil pressure,pore water pressure and steel strain,are used to develop the clustering model.The clustering results are verified by analyzing the engineering geological conditions;the validity and the efficacy of the proposed method are also demonstrated.Further,the fuzzy clustering analysis also represents a potential for identifying abnormal monitoring data.This investigation indicates the fuzzy clustering analysis method is capable of characterizing the fuzziness of tunnel health,and beneficial to clarify the tunnel health evaluation uncertainties.     

Departure Trajectory Design Based on Pareto Ant Colony Algorithm

Due to the ever-increasing air traffic flow,the influence of aircraft noise around the airport has become significant.As most airlines are trying to decrease operation cost,stringent requirements for more simple and efficient departure trajectory are on a rise.Therefore,a departure trajectory design was established for performancebased navigation technology,and a multi-objective optimization model was developed,with constraints of safety and noise influence,as well as optimization targets of efficiency and simplicity.An improved ant colony algorithm was then proposed to solve the optimization problem.Finally,an experiment was conducted using the Lanzhou terminal airspace operation data,and the results showed that the designed departure trajectory was feasible and efficient in decreasing the aircraft noise influence.     

基于独立桨距控制的电控旋翼主动振动控制

电控旋翼利用桨叶后缘襟翼偏转通过气弹作用带动桨叶变距,从而实现对旋翼的控制。但由于其系统的复杂性,桨叶间易存在扭转刚度和质量不相似,从而引起较严重的旋翼振动。针对该情况,提出了基于独立桨距控制的主动振动控制方法,并以某原理性电控旋翼为算例进行了数值仿真,验证了所提出控制方法对电控旋翼由扭转刚度和质量不相似引起振动的减振有效性,最佳减振水平可达90%。     

小型无人直升机传动系统的设计与研究

介绍使用在小型无人直升机上的带传动，非常规的弹性联轴节，楔块式单向超越离合器和新颖的尾传动轴设计的结构特点和工作原理。     

新亚欧大陆桥的态势分析及其对江苏经济发展的作用

介绍了新亚欧大陆桥的概况，分析了它的态势，认为它的美好前景少则二三年多则三五年即可实现。它为江苏经济发展提供了新的机遇。例如改善了江苏省发展外向型经济的地理区位条件，提供了西向中亚、西亚和欧洲进出口的唯一陆上通道，加强了江苏与我国中、西部地区的经济联系与合作；特别是；连沂徐经济带将因大陆桥而迅速崛起，它是加快苏北发展的契机，东方桥头堡连云港将发挥龙头作用。本文呼吁抓住契机，提出了若干建议。     

Formation and Role of H2O2 During Ozonation of Nitrobenzene

To better understand the formation of H2O2 in the ozonation of nitrobenzene and its role for the oxidation,a batch reactor of nitrobenzene ozonation was set up.The variables such as pH value,ozone dosage,and the presence of hydroxyl radical scavenger were investigated.The results showed that high accumulations of H2O2 were generally formed at low pH values and low ozone dosages.Moreover,H2O2 mainly formed after nitrobenzene was oxidized by hydroxyl radical during ozonation of the intermediates,such as p-nitrophenol,which reacted with ozone quickly in water.A small amount of additional H2O2 enhanced the nitrobenzene removal slightly.The kinetic study showed that nitrobenzene degradation fitted with pseudo-second-order kinetics well in the experiment.The kinetic constant values correlated linearly with the concentrations of H2O2 added.Thus,it is expected that the H2O2 formed in oxidation of nitrobenzene may initiate ozone decomposition to form hydroxyl radical and finally enhance the degradation of aromatic compounds to a certain extent.     

叠层模板的电沉积成形技术实验

介绍了叠层模板电沉积(Laminated template electrodeposition,LTE)方法的加工原理和具体工序,利用LTE系统进行了电沉积成形加工实验。对加工中由于电场强度分布不均导致沉积层生长不均的实验现象通过模拟仿真进行了分析和探讨,预估实验过程。根据加工策略对主要影响因素电流和时间进行了优化选择,通过拉伸试验测试了层间结合强度。最后,进行了异型铜质结构零件的实验研究,探讨和验证了该方法对于复杂结构零件成形的可行性。     

虚拟多触角探测的高超声速滑翔飞行器再入机动制导

针对高超声速滑翔飞行器再入过程中面对的多约束问题,提出一种基于虚拟多触角探测的路航点规划机动制导策略。该机动制导策略通过飞行器最大转弯轨迹计算速度-剩余地面距离-航向角约束,在分段定点模式中发出多条粗略预测触角,引用触角末端反馈的信息计算优先级以确定临时路航点;同时在机动制导模式中发出精细探测触角,计算触角末端信息优先级,经倾侧角延时滤波器得出控制指令,对飞行器进行机动制导。基于多触角探测的路航点规划机动制导策略,降低了三触角机动制导方法中的计算时间;同时,4种典型禁飞区条件下的仿真结果表明,该策略能够有效稳定地解决机动制导过程中的多约束问题。     

湍流控制屏声学校准及校准精度影响因素

湍流控制屏（TCS）是航空发动机风扇噪声试验必备的试验设施。由于湍流控制屏的作用,风扇前传噪声向远场传播时会产生传递损失。通过对湍流控制屏的声学校准,可以获取湍流控制屏的声学修正量,从而实现对风扇前传噪声的修正。本文结合实际工程应用条件,分析了湍流控制屏重复安装的位置精度、校准声源重复性、稳定性、校准声源位置偏差、温湿度修正等因素对湍流控制屏声学修正量精度的影响;结合上述影响因素,对湍流控制屏160 Hz~40 kHz的声学修正量的特征进行分析,总结工程应用中湍流控制屏高精度声学校准的注意事项,提出湍流控制屏的声学校准应包含测量不确定度。     

职务分析在高职院校人力资源管理中的应用

职务分析是人力资源管理的基础，是一种重要的人力资源管理技术，只有作好了职务分析工作，其它的人力资源管理工作才能顺利地开展。论文分析了高职院校进行职务分析的必要性，较全面地阐述了在高职院校进行职务分析的实施过程，并提出了进行职务分析时应注意的问题。