球电流壳磁场的计算

计算的结果表明，球壳内的磁场是均匀的，可用此方法在一定范围内获得均匀磁场．     

Design and implementation of 2DOF spherical inverted pendulum

1.INTRODUCTION Theinvertedpendulumsystemisaclassicalbench markfortheeducationandresearchintheautomation andmechanicalengineeringfield.Manyeducatorsfo cusontheinvertedpendulumcontrolsystembecause theexperimentsexhibittheadvantageandvalidityof moderncontroltheoryveryintuitively.Researchers alsohopetoverifynewalgorithmsonthesystem. Thebasicobjectiveoftheinverted pendulumsystem iskeepingthebalanceofthependulumatthe‘invert ed’status[1～3].Wehavecomparedtheperformance ofthreemoderncontrolm…     

SQJ-Ⅰ型大型石球圆筒刀具对心加工设备的研制与应用

阐述了球面与圆筒刀具对心加工原理。介绍了应用该原理研制的SQJ—I型大型石球加工设备的结构特点、加工过程和性能特点。     

新型锚喷支护结构在萍乡矿区的应用

根据壳体结构的力学原理设计地下新型网壳喷层结构，大幅度提高喷层的抗弯能力，同时使喷层整体具有一定的可缩性，能承受强大变形地压及采动荷载，达到用较少材料又提高喷层支撑能力与让压的目标，较好解决了加强支撑、喷层合理配筋、简化施工作业、降低材料消耗等问题，在萍乡软岩巷道中进行了工业性试验。     

倾斜导轨上二级倒立摆的控制

本文在已有的倾斜导轨上二级倒立摆数学模型的基础上,采用极点配置方法和线性二次型最优控制器对导轨倾斜45o时的二级倒立摆进行了控制,并用MATLAB进行了控制结果仿真,仿真结果表明,控制效果较好。     

《左传》人物祸福预言类型考论

将<左传>中所记载的人物祸福预言,作出分类与考论,将其分为形貌,言语行为、梦境、卜筮、灾异、天象、歌谣(谶语)六类,并通过此类预言对其所具有的社会思想价值作出分析与评论.     

新建白果沱大桥拱轴系数的确定

原白果沱大桥因当地经济的发展及下游修建水电站的影响，需拆除重建。文章就设计过程中拱轴系数的比选情况进行了说明。     

Samples Selection for Artificial Neural Network Training in Preliminary Structural Design

An artificial neural network (ANN) is applied in the preliminary structural design of reticulated shells. Major efforts are made to enhance the generalization ability of networks through well-selected training samples. Number-theoretic methods (NTMs) are adopted to generate samples with low discrepancy, i.e.uniformly scattered in the domain, where discrepancy is a quantitative measurement of the uniformity. The discrepancy of the NTM-based sample set is 1/6-1/7 that of samples with equal spacing. In a case study,networks trained by NTM-based samples are compared with those trained by equal-spaced samples in generalizing performance. The results show that both the computational precision and stability of the former ANNs are more satisfactory than those of the latter. It is concluded that the flexibility of ANNs in generalizing can be effectively increased by use of uniformly distributed training samples rather than simply piling data.More reliable uniformity should be obtained, however, through NTMs instead of equal-spaced samples.     

Mindlin层合圆柱壳理论的Hamiltonian结构与辛解析解

通过引进状态变量及其对偶变量。建立Ｍｉｎｄｌｉｎ层合圆柱壳的Ｈａｍｉｌｔｏｎ正则方程．在辛几何数学框架下，采用共轭辛正交归一关系给出各种复杂边界条件下的精确解．