基于轴变形的脚楦匹配方法*

提出并实现了通过脚楦匹配方法来仿真人脚穿上鞋子的状态,能够直观、便利地检查和分析鞋类产品的舒适度。该方法包括三个步骤：首先,保持鞋楦的位置不动,调整脚型的位置,使其与鞋楦严格对齐;其次,基于轴线变形算法,对脚型进行略微变形,使其与鞋楦姿势匹配;最后,根据匹配结果生成脚楦多个截面的分析图,指导对鞋楦舒适度的分析和楦体修改。实验结果表明,该方法能够有效地检查鞋楦的舒适度,可应用到个性化定制业务。     

求解Job-shop调度问题的遗传蚁群算法*

描述了Job-shop调度问题,研究遗传算法和蚁群算法在解决Job-shop问题中的优点和不足,融合遗传算法和蚁群算法设计了遗传蚁群算法以求解Job-shop调度问题,并对算法进行了仿真实验,通过与遗传算法、蚁群算法及已有的遗传算法和蚁群算法的融合算法结果的对比,验证了该算法的有效性。     

电力变压器铁芯温度场分布的数值模拟及分析

应用ANSYS有限元软件的顺序耦合法,分析了变压器的电磁场分布,并将电磁场分析结果作为热生成率载荷,得到干式电力变压器铁芯的内部温度场分布.该方法可有效减少变压器的设计成本,也可以对已运行的设备进行电磁场和热场分布的分析.     

基于悬臂梁啁啾调谐的光纤光栅滤波器

提出并发展了一种基于悬臂梁结构的啁啾光纤Bragg光栅(CFBG)啁啾调谐方案,获得了一系列性能优异的可调谐CFBG滤波器,包括调谐范围达到36 nm(1.8～37.8 nm)的带宽可变反射滤波器、色散在178～2 100ps/nm范围内可调的色散补偿器、基于取样CFBG或重叠写入CFBG的信道间隔可调谐滤波器等。这些FBG滤波器不但能维持较高的反射率,还能保持中心波长基本不变。     

Modeling large reversible electric-field-induced strain in ferroelectric materials using 90° orientation switching

Reversible large electric-field-induced strain caused by reversible orientation switchings in BaTiO3 is modeled using the Landau's theory of phase transition. A triple well free energy function is constructed. Each of its minima is associated with one of the polarization orientations involved. Nonlinear constitu- tive laws accounting for reversible orientation switchings and electrostriction effects are obtained by using thermodynamic equilibrium conditions. Hysteretic dynamics of one-dimensional structures is described by coupled nonlinear differential equations. Double hysteretic loops in the electric and me- chanic fields are both successfully modeled. Giant reversible electrostriction is modeled as a conse-quence of reversible orientation switchings via electro-mechanical couplings. Comparisons with ex-perimental results reported in literatures are presented.     

Equilibrium equations for nonlinear buckling analysis of drill-strings in 3D curved well-bores

With the development of drilling technology, the oil/gas well has evolved from its early vertical straight form to the inclined, horizontal, plane curved, or even 3D curved well-bore. Understanding of the buck-ling behavior of a drill-string in a well-bore is crucial for the success of a drilling operation. Therefore, equilibrium equations for analyzing the buckling behavior of a drill-string in a 3D curved well-bore are required. Based on Love’s equilibrium equations for a curved and twisted rod in space, ...     

Earth pressure balance control for EPB shield

This paper mainly deals with the critical technology of earth pressure balance (EPB) control in shield tunneling. On the assumption that the conditioned soil in the working chamber of the shield is plasticized, a theoretical principle for EPB control is proposed. Dynamic equilibrium of intake volume and discharge volume generated by thrust and discharge is modeled theoretically to simulate the earth pressure variation during excavating. The thrust system and the screw conveyor system for earth pressure cont...     

Vertical shaking table tests on the structure with viscoelastic multi-dimensional earthquake isolation and mitigation devices

The viscoelastic multi-dimensional earthquake isolation and mitigation device is a new kind of passive control device, which can perform its "name-giving" task of earthquake isolation and earthquake mitigation simultaneously. In order to quantify its vertical earthquake isolation and mitigation effect on structures, firstly, shaking table tests on steel frame structures with and without the devices were carried out; secondly, analysis on dynamic characteristics and dynamic responses of the structures was al...     

启发式探索的协议测试序列生成

为避免可达性分析方法生成协议测试序列状态过程中爆炸问题的出现,提出了一种启发式探索协议状态格局空间的可执行测试序列生成算法. 该算法采用权值扩展有限状态机建模被测协议,以启发式状态格局探索策略替代传统的宽度优先搜索方式生成可执行协议测试序列;把协议可执行测试序列生成转化为在协议状态格局空间中探寻最小权值路径的问题. 实验数据表明,与宽度优先可达性分析方法相比,新算法具有较好的时空特性.     

基于最优格拉斯曼框架的测量矩阵投影构造方法

压缩采样中测量矩阵对于信号的压缩及重建都有着十分重要的作用。为了减小测量矩阵与稀疏变换矩阵的互相干性,对测量矩阵和稀疏变换矩阵的乘积,构造其Gram矩阵并通过最优投影法优化之。格拉斯曼框架各元素间具有较小的相干性,使优化后的矩阵逼近格拉斯曼框架则可以获得更好的性能。