基于多层耦合网络的装备保障体系级联失效及抗毁性分析

为准确描述装备保障体系结构特征与毁伤失效流程,进而提升装备保障体系功能与抗毁能力,基于杀伤层、保障层和储供层构建装备保障体系的多层耦合网络模型。基于杀伤链给出装备维修保障链与储供保障链的特征和典型样式,在此基础上,提出考虑装备保障体系多层耦合网络特性的级联失效模型与节点重要度评估方法。给出对应的网络抗毁性评估指标。仿真结果表明,考虑级联失效的多层耦合网络模型能较好地反映遭受攻击时整个装备保障体系的性能变化情况,所提出的使命任务节点重要度能准确识别关键节点。与传统网络抗毁性指标相比,杀伤链数量对节点失效产生的装备保障体系抗毁性变化更加敏感。

多平台航电系统综合可信度度量方案研究

信息技术的飞速发展促使未来空战由机械化向信息化、智能化、多平台集成化转化和发展.本文针对未来多平台航空电子体系架构下的航电系统可信度评估与仿真验证问题,建立多平台航电系统可信度度量方法,提出集成“系统可靠性”和“任务支撑度”的多平台航电系统可信度度量指标体系架构.在此基础上,提出基于专家打分和模糊层次分析法的多平台航空电子可信度值计算方法,以对未来空战的多模态作战任务进行综合分析和量化判断.仿真实验结果表明,本文提出的多平台航电系统可信度度量方案可以根据各子平台、子系统的状态、综合评估整个多平台系统的信任度.

Influence of earthquake ground motion incoherency on multi-support structures

A linear response history analysis method is used to determine the influence of three factors:geometric incoherency,wave-passage,and local site characteristics on the response of lnulti-support structures subjected to differential ground motions.A one-span frame and a reduced model of a 24-span bridge,located in Las Vegas,Nevada are studied,in which the influence of each of the three factors and their combinations are analyzed.It is revealed that the incoherency of earthquake ground motion can have a dramatic influence on structural response by modifying the dynamics response to uniform excitation and inducing pseudo-static response,which does not exist in structures subjected to uniform excitation.The total response when all three sources of ground motion incoherency are included is generally larger than that of uniform excitation.

Experimental Investigation and Optimization Design of Multi-Support Pipeline System

The design of aircraft hydraulic pipeline system is limited by many factors,such as the integrity of aviation structure or narrow installation space,so the limited clamp support position should be considered.This paper studied the frequency adjustment and dynamic responses reduction of the multi-support pipeline system through experiment and numerical simulation.To avoid the resonance of pipeline system,we proposed two different optimization programs,one was to avoid aero-engine working range,and another was to avoid aircraft hydraulic pump pulsation range.An optimization method was introduced in this paper to obtain the optimal clamp position.The experiments were introduced to validate the optimization results,and the theoretical optimization results can agree well with the test.With regard to avoiding the aero-engine vibration frequency,the test results revealed that the first natural frequency was far from the aero-engine vibration frequency.And the dynamic frequency sweep results showed that no resonance occurred on the pipeline in the engine vibration frequency range after optimization.Additionally,with regard to avoiding the pump vibration frequency,the test results revealed that natural frequencies have been adjusted and far from the pump vibration frequency.And the dynamic frequency sweep results showed that pipeline under optimal clamp position cannot lead to resonance.The sensitivity analysis results revealed the changing relationships between different clamp position and natural frequency.This study can provide helpful guidance on the analysis and design of practical aircraft pipeline.

A new spatial coherence model and analytical coeffi cients for multi-support response spectrum combination

In this paper, a new spatial coherence model of seismic ground motions is proposed by a fitting procedure. The analytical expressions of modal combination （correlation） coefficients of structural response are developed for multi-support seismic excitations. The coefficients from both the numerical integration and analytical solutions are compared to verify the accuracy of the solutions. It is shown that the analytical expressions of numerical modal combination coefficients are of high accuracy. The results of random responses of an example bridge show that the analytical modal combination coefficients developed in this paper are accurate enough to meet the requirements needed in practice. In addition, the computational efficiency of the analytical solutions of the modal combination coefficients is demonstrated by the response computation of the example bridge. It is found that the time required for the structural response analysis by using the analytical modal combination coefficients is less than 1/20 of that using numerical integral methods.

Research on the random seismic response analysis for multi- and large-span structures to multi-support excitations

The pseudo excitation method(PEM) has been improved into a more practical form,on which the analytic formulae of seismic response power spectral density(PSD) of simplified large-span structural models have been derived.The analytic formulae and numerical computing results of seismic response PSD have been derived to study the mechanism of multi-support excitation effects,such as the wave-passage effect and incoherence effect,for the seismic response of multiand large-span structures.By using a multi-span truss as an example,the influence of multi-support excitation effects on the seismic response of such structures is studied.

多能互补提供频率支撑的储能容量分布鲁棒规划方法

随着具有不确定性的新能源大规模并网,电力系统的频率安全面临严峻挑战,而合理规划储能是维持电力系统稳定运行和应对可再生能源不确定性的重要手段。为此,针对高可再生能源渗透率系统的储能容量规划问题,提出了一种考虑多能互补提供频率支撑的储能容量分布鲁棒规划方法。首先,建立了多能互补提供频率支撑的频率安全模型,并将其线性化后嵌入到典型日运行中,以维护电力系统频率的稳定性。其次,采用基于生成对抗网络的分布鲁棒优化,实现在新能源出力最劣概率分布下的储能容量规划,以应对新能源出力的不确定性。最后,基于IEEE 39节点系统进行算例分析,验证了所提方法可在保证电力系统频率安全的同时,具有较好的经济性和鲁棒性。

Seismic response of large-span spatial structures under multi-support and multidimensional excitations including rotational components

To achieve rational and precise seismic response predictions of large span spatial structures(LSSSs),the inherent non-uniformity and multidimensionality characteristics of earthquake ground motions should be properly taken into consideration.However,due to the limitations of available earthquake stations to record seismic rotational components,the effects of rocking and torsional earthquake components are commonly neglected in the seismic analyses of LSSSs.In this study,a newly developed method to extract the rocking and torsion components at any point along the area of a deployed dense array from the translational earthquake recordings is applied to obtain the rotational seismic inputs for a LSSS.The numerical model of an actual LSSS,the Dalian International Conference Center(DICC),is developed to study the influences of multi-support and multidimensional excitations on the seismic responses of LSSSs.The numerical results reveal that the non-uniformity and multidimensionality of ground motion input can considerably affect the dynamic response of the DICC.The specific degree of influence on the overall and local structural displacements,deformations and forces are comprehensively investigated and discussed.

基于SVM的多维相似大数据分类系统设计

受大数据自身相似性的影响,传统数据分类方式的分类精度偏低,为此提出基于支持向量机(Support Vector Machine,SVM)的多维相似大数据分类系统设计研究。将MYC-JX8MMA7核心板作为系统设计的开发载体,构建SVM线性回归模型,通过构建一个回归平面,保障所有多维相似大数据与平面之间的距离均处于最小状态,利用待分类数据与最佳分类界面被标记样本之间的相似度,实现对数据的分类。在测试结果中,分类结果F1 Score稳定在0.82以上,明显优于对照组。

乡村青年教师的使命担当、应有特质及培育路径研究

高质量乡村青年教师是建设高质量乡村教育的根本保障。新时代背景下,乡村青年教师被赋予了乡村振兴的推进者、乡村文化的弘扬者、乡村儿童的引路人等时代使命,乡村青年教师应具备专业知识与地方知识兼具、一般能力与特殊能力结合、教育信仰与乡土情怀共存的特质。乡村青年教师的培育可依托职前培养为乡村青年教师应有特质的生成蓄能积势,关注其职后成长,实现乡村青年教师应有特质的场域升华,同时多措并举构建乡村青年教师发展的多元支持体系。

The Liner Formulas between the Supporting Force and Axis Warp of Large-scale Rotary Kiln with Multi-support

Kilns are the key equipment in the metallurgy,architectural and chemistry industry. It is the statically indeterminate system with over load, large torque and multi-support. The kiln move axis warp resulting in that the load distribution is asymmetry, cause many mechanical failure and safe accidents and the interruption of the produce, which bring a great losses. Treating the distribution of the kiln load and the complexity of the stiffness change, the all-purpose model and matrix, used to solve the variable-stiffness beam upon complex load, are established in this paper. The resultant force of kiln in vertical and horizontal direction is calculated. Accordingly, the liner formulas for calculating the supporting force of the support wheels are obtained, and the wheel supporting force also can be easily obtained based on each shell warp. This will provide theory conference for safety management and rational maintenance.

复杂地质条件下敞开式TBM若干设计问题的探讨

研究目的:针对敞开式TBM隧道在高原复杂地质环境下进行修建时,支护体系、同步掘进、物料运输等容易受到地质环境影响,影响TBM正常施工的问题,开展系统研究和分析,结果可为同类工程提供参考或借鉴。研究结论:(1)基于TBM的施工特点,提出了局部钢架、槽钢及锚杆,并配合进行空腔回填的支护分级措施,可以满足复杂地质环境破碎围岩下的TBM快速施工要求;(2)针对TBM掘进段出现二次衬砌断面内净空大小不一的情况,提出了采用混凝土填充初支和二衬间空腔的措施,以及应用变径台车施作不同断面尺寸的二次衬砌,满足衬砌与TBM掘进同步施工,适应多类型衬砌断面;(3)分析比较了两种TBM有轨运输方案,相较于四轨三线式,矮边墙式模板台车有单独的轨道,利于材料运输,方便管理,提高了施工效率,优点显著,更适用于高原TBM隧道建设;(4)本文提出的破碎围岩分级支护体系、同步掘进及有轨运输技术可为类似的TBM隧道工程提供理论和技术指导。

液压支架自动故障诊断系统的应用研究

针对液压支架在运行过程中存在的故障率高、检修困难,严重影响井下支护安全的问题,提出了一种新的液压支架自动故障诊断系统。其以多类型传感器监测为核心,实现对液压支架运行状态的实时监测,通过建立液压支架电液系统故障库和故障自动判断程序,实现了对液压支架运行故障的自动诊断和定位。根据实际应用表明,该支架自动故障诊断系统能够将支架运行故障降低87.4%、支架故障排除时间降低77.1%,极大地提升了液压支架的运行稳定性和安全性。

数字时代老年人跨越数字鸿沟的多元保障体系--基于杭州市老年人数字化生活的调查研究

本文以杭州市老年人为调查对象,通过分析老年人对数字化生活的满意度及需求类型,探寻老年人如何跨越数字鸿沟。当前老年人群使用智能化产品的比重不大,且使用人群的使用频率较低、使用障碍较大。调查结果显示,功能适用、使用简易的适老产品,以及家庭、社区和政府有针对性的指导帮扶,能极大提高老年人数字化生活的满意度。从数字化生活的需求类型来看,一键服务模式、晚辈指导使用、社区组织培训、网络安全和家中装有宽带是老年人跨越数字鸿沟的必备需求,志愿者指导和政府政策优惠属于期望需求,而终端设备的相关质量是提升满意度的关键因素。最后,本文提出了政府、社区、企业、老年人自身四方协作,形成跨越数字鸿沟的多元保障体系。

滑道不平顺对多点支承斜拉桥转体系统受力和稳定性影响研究

跨襄阳北编组站为齿轮齿轨式多点支承转体斜拉桥,滑道的平顺性是多点支承转体施工的重要因素之一,为研究滑道不平顺对多点支承转体系统受力和转动稳定性的影响,通过大比例转体模型试验,探讨了滑道不平顺对承力支腿应力、球铰应力、转动牵引力、主梁位移和扭转的影响。研究结果表明:随着滑道不平顺度的增大,应力变化规律基本不发生改变,而承力支腿的应力变化率随之增大,桥梁转动稳定性逐渐降低;当承力支腿经过不平顺滑道时,上、下球铰应力变化率基本在±5%范围内发生波动,球铰应力受滑道不平顺影响较小;随着滑道不平顺度的增大,转动所需的牵引力和主梁竖向幅值逐渐增大,而滑道不平顺对主梁扭转和主梁应力影响较小。

Generation of endurance time excitation functions using spectral representation method

In this study,application of the spectral representation method for generation of endurance time excitation functions is introduced.Using this method,the intensifying acceleration time series is generated so that its acceleration response spectrum in any desired time duration is compatible with a time-scaled predefined acceleration response spectrum.For this purpose,simulated stationary acceleration time series is multiplied by the time dependent linear modulation function,then using a simple iterative scheme,it is forced to match a target acceleration response spectrum.It is shown that the generated samples have excellent conformity in low frequency,which is useful for nonlinear endurance time analysis.In the second part of this study,it is shown that this procedure can be extended to generate a set of spatially correlated endurance time excitation functions.This makes it possible to assess the performance of long structures under multi-support seismic excitation using endurance time analysis.

基于多Agent的企业市场营销决策支持系统设计

由于当前已有系统未能采用模糊调整-模拟反馈方法对市场需求进行预测,导致企业市场营销决策支持错误率和响应时间上升、可靠性下降,为此提出一种基于多Agent的企业市场营销决策支持系统,结合Agent技术和理论进行设计,详细阐述系统的具体操作流程。通过模糊调整-模拟反馈方法对企业市场需求进行预测,调整市场营销策略,确定营销计划,最终实现企业市场营销决策支持系统设计。仿真实验结果表明,所设计系统能够有效提升系统的可靠性,同时降低企业市场营销决策支持错误率和响应时间。

基于MSSA-SVM的电缆隧道故障预警系统设计

为了实现电缆隧道环境的在线监测和故障报警,提高电缆隧道监测系统的智能化水平,提出了一种基于多特征麻雀搜索算法(multi-feature modified sparrow search algorithm, MSSA)优化支持向量机(support vector machines, SVM)的故障预警系统。首先,对故障数据集进行归一化预处理;其次,建立多分类SVM模型,用MSSA对SVM进行参数寻优,从而建立MSSA-SVM模型,并将训练好的MSSA-SVM模型嵌入故障预警系统的数据库服务器中,对实时采集的数据进行在线监测、诊断,并及时报警;最后,通过实验验证了MSSA-SVM模型的有效性,并将其与麻雀搜索算法(sparrow search algorithm, SSA)、灰狼优化算法(grey wolf optimization, GWO)和粒子群算法(particle swarm optimization, PSO)进行对照实验,实验结果表明,MSSA-SVM模型的故障识别准确率最高,其识别准确率可达95%。研究结果为有效提高电缆隧道在线监测的智能性和准确性提供了参考。

承插型盘扣式支撑架在密肋梁施工中的应用

承插型盘扣式支撑架已成为模板支撑体系的主流形式之一,但由于产品规格尺寸限制,其应用于异形结构时显得灵活性不足,需对施工方案进行精心设计。文中以北京CBD核心区地下空间项目中采用的密肋梁模架施工为例,介绍了承插型盘扣式支撑架在此类结构中的应用情况,包括模架支撑体系的选择、主要材料的选择、对密肋梁结构模架搭设的处理方式、模架构造措施以及计算方法。

民用无人机作业气象标准制订及气象保障体系构建浅析

我国民用无人机作业在影视、农林、勘测、安防等诸多领域得到了广泛应用,作业高度多在低空空域,属于通用航空(通航)领域的应用分支。气象服务作为飞行最重要的基础保障之一,日益成为制约我国通航产业发展的瓶颈。该领域尚缺少系统性、针对性的气象指标和保障措施。本文从无人机作业领域、气象影响因素、无人机作业气象标准制订方面提出了“多部门联合”共建无人机作业气象标准的思路。并以无人机作业气象系列标准中的植保作业为例,给出了作业期间天气实况、预报信息登记表,为气象服务提供数据记录蓝本。其次,就当前无人机作业气象保障存在的短板,从气象指标体系构建、多元数据融合产品研发、通信机制的建立完善等方面提出了展望,旨在为完善无人机作业气象保障体系提供思路和建议,并为拓展通航气象服务新领域、创新发展奠定理论基础。