塔机动态特性的研究

分析、比较了当前塔式起重机动态特性研究中几种常用的方法，着重介绍了动力有限元法，利用ＡＬＧＯＲ有限元软件对实例进行了计算，得到了满意的结果。     

最优布局中任意曲线状图形处理

介绍了适合于多类型、曲线状零件优化排料的图形处理数据结构和算法，并加以探讨和研究。以此思想所设计的系统运行结果良好。     

A modular algorithm for resource allocation

This paper concerns resource allocation in distributed message passing systems, i.e., the scheduling of accesses to exclusive system resources shared among concurrent processes. An efficient modular resource allocation algorithm is presented that uses any arbitrary resource allocation algorithm as a subroutine. It improves the performance of the subroutine by letting each process wait only for its currently conflicting processes, and therefore, allows more concurrency. For appropriate choices of the subroutine, we obtain resource allocation algorithms with the minimum worst case response times. Simulation studies were conducted which also indicate that on average, the obtained algorithms perform faster and require a smaller number of messages than other previously known algorithms, especially when resource contention among processes is high and the average time that a process remains in the critical region is large. Received: May 1997 / Accepted: May 1998     

一种新的动态二值化算法

本文提出了一种新的动态二值化算法，以实现从灰度点阵图象中提取其对象。通过分析象素和其所在的局部区和灰度值等数字特征，可以判断局部区的内是否存在对象，阈值和判断条件对应。     

二级倒立摆摆起控制的研究

通过对二级倒立摆系统的理论分析，研究二级摆从自然悬垂位置摆到倒立点位置的摆起控制问题，提出了基于动态设计变量优化算法的复杂非线性系统控制策略．仿真实验证明，该策略可成功地实现圆轨和直轨两种二级倒立摆的摆起控制，并且算法具有较快的收敛速度和较高的计算精度．     

输出反馈实现一类带不确定输入动态非线性系统的鲁棒几乎干扰解耦

研究一类带不确定输入动态非线性系统的输出反馈干扰抑制问题并基于观测器给出了输出反馈控制器 构造性的设计方法.所设计的控制器具有对可允许不确定动态的鲁棒性.不仅在L₂增益意义上抑制了干扰对输出 的影响,同时在ISS镇定意义上抑制了干扰对状态的影响.     

不确定混沌系统的动态神经网络跟踪控制

针对不确定非线性混沌系统，提出了一种基于动态神经网络辨识器的自适应跟踪控制新方法，通过滑模控制技术在线调整动态神经网络辨识器权值，并在获取动态神经网络模型的基础上设计出优化控制器，实现混沌系统的轨道跟踪，对辨识误差和轨道跟踪误差进行分析并证明了它们的有界性，Lorenz混沌系统的仿真实验结果表明了控制策略的有效性。     

含硼微合金钢的静态及动态软化行为

运用gleeble-1500热模拟试验机November对含硼微合金钢进行了单、双道次压缩模拟,并通过非线性回归分析得到了静态与动态软化百分比(X)与变形温度(T)、变形程度(ε)、变形速率(ε·)、原始晶粒尺寸(d0)、道次间隔时间(t)之间的关系。     

PZT polarization voltage effects on off-centered PZT patch actuating silicon membrane

We have investigated the static and dynamic behavior of piezoelectric (PZT) actuated SiO₂/Si membranes with an off-centered PZT patch. Three-dimensional wide-field interferometer has been used to achieve measurement of membrane topography and bending. It is demonstrated that the piezoelectric coefficient d₃₁ can be extracted directly from these three-dimensional static deformation measurements. We have also shown that polarization voltage of an off-centered PZT patch influences in a different manner the resonant frequency shift of the first and the second vibration modes. Degenerated modes can be also discriminated thanks to the positioning of the PZT patch.     

大型水电站地下厂房机组支撑结构动力特性研究

就在建的某大型水电站地下厂房结构 ,分析计算了 18种振源的频率 ,全部采用三维实体单元对其进行模拟 ,建立了多个三维有限元模型并进行了计算分析和共振校核 ,研究了机组支撑结构不同的结构布置形式 ,不同的边界条件和不同的材料对其动力特性的影响 ,得出了一些结论 ,为有效优化地下厂房结构的整体动力特性 ,改进抗振设计提供了途径和依据