A New Fine Damping Method for Solid ESG Rotor

Introduction The spin axis of ESG rotor will move alongclosed trajectories periodically after spin up, thetrajectories enclose either the maximum or theminimum principal axis of inertia depending on theinitial conditions, which is classical polhode mo-tion[1-4]. It is necessary to damp the polhode mo-tion to ensure that the spin axis is aligned with therotor maximum principal axis of inertia for ESGsignal readout. Passive damping and active damp-ing are two common schemes to fulfill this pro…     

新形势下建立健全安全管理机制之我见

抓安全生产，实现全过程、全方位的安全生产，建立健全安全管理机制是至关重要的因素。阐述安全管理责任机制的建立、安全管理约束机制和安全保障机制的建立。     

A POCS-Based Algorithm for Blocking Artifacts Reduction

Introduction Block-based discrete cosine transform(BDCT) is considered to be a basic tool in bothstill and moving image compression standards,such as JPEG, H.261/263, and MPEG, owing toits near-optimal energy compaction property andmoderate hardware complexity. However, sinceeach N×N block is coded independently, the re-constructed images would exhibit annoying discon-tinuities along block boundaries at low bit rate,which are often referred to as the“blocking arti-facts”in the transfo…     

A Constrained Controller Based on State Estimation

IntroductionIn practice, owing to the limitations of actua-tors and other physical properties, the inputs of asystem are often subject to constraints. It has sig-nificant theoretical and engineering values to inves-tigate the control of constrained systems. In thepast years, many attempts have been made on thisissue[1-5]. For a class of uncertain constrained dis-crete-time systems, Kothare, et al[4]proposed anonline receding predictive control algorithm. Byanalyzing the degradation condition …     

海运集装箱运输路径选择

基于海运集装箱运输问题特性的分析，建立了需求不确定的海运集装箱路径随机规划模型．该模型以集装箱运输过程中利润最大为目标函数，主要约束包括航段容量和装载质量限制、重箱和空箱需求（重箱需求为随机变量）．应用机会约束规划方法求解模型．通过数值仿真，证明了模型的可行性．仿真结果表明，运力以及各起讫对运价是影响集装箱的路径选择的关键因素，而某一单一起讫对运价的变化对集装箱路径选择的影响不大．     

半穿式钢桁梁桥横向振动TMD阻尼减振研究

针对我国既有铁路常见的半穿式钢桁梁桥的振动特性,建立了车—桥—TMD系统耦合振动方程,对采用多点调频质量阻尼器抑制既有铁路钢桁梁桥横向振动的阻尼减振方案进行了仿真计算,结果表明:TMD能有效的抑制铁路半穿式铁路钢桁梁桥的横向振动。     

现浇砼PC连续箱梁病害分析和体外预应力加固的立论问题

我省现浇PC连续箱梁的病害比较普遍,病因众口不一。文章从裂缝所在的部位、方向和多种形态入手,进行了分析．找出了病害的真正原因——早期混凝土收缩所致。由于支架和底模对具有摩阻约束,使强度很低的混凝土受拉开裂。防治的有效办法是缩短现浇段的长度。文章还探讨了体外预应力加固方案的立论问题,为定量的选定体外预应力加固提供依据。     

求解复合材料阻尼损失因子的有限元模态分析法

利用有限元模态分析方法计算复合材料的阻尼损失因子，并以美国某公司的研究项目为算例进行考核．与试验相比，结果是令人满意的．     

基于多元数据融合分析的网级路面养护决策方案研究

随着我国公路网的建设和完善,公路养护里程和公路服务水平需求日益增强,科学规划公路养护资金以及制定养护计划极为重要。结合路面工程养护实践,深入分析网级路面养护影响因素,提出基于多元数据融合分析的网级路面养护决策方案。该方案综合分析路面技术状况和交通量等数据,同时充分考虑资金、原路面结构和养护历史等因素,通过关联性分析建立养护决策模型,针对路况优先和资金约束两种情况制定详细的养护计划,并对结果进行多维度分析展示,为养护决策方案的制定提供实用的工具。通过选取某公路网进行养护决策试验,验证结果显示,本方案具备科学性和实用性。