Distributed synchronization control of complex networks with communication constraints

This paper is concerned with the distributed synchronization control of complex networks with communication constraints. In this work, the controllers communicate with each other through the wireless network, acting as a controller network. Due to the constrained transmission power, techniques such as the packet size reduction and transmission rate reduction schemes are proposed which could help reduce communication load of the controller network. The packet dropout problem is also considered in the controller design since it is often encountered in networked control systems. We show that the closed-loop system can be modeled as a switched system with uncertainties and random variables. By resorting to the switched system approach and some stochastic system analysis method, a new sufficient condition is firstly proposed such that the exponential synchronization is guaranteed in the mean-square sense. The controller gains are determined by using the well-known cone complementarity linearization (CCL) algorithm. Finally, a simulation study is performed, which demonstrates the effectiveness of the proposed design algorithm.     

Parameterized data-driven fuzzy model based optimal control of a semi-batch reactor

A parameterized data-driven fuzzy (PDDF) model structure is proposed for semi-batch processes, and its application for optimal control is illustrated. The orthonormally parameterized input trajectories, initial states and process parameters are the inputs to the model, which predicts the output trajectories in terms of Fourier coefficients. Fuzzy rules are formulated based on the signs of a linear data-driven model, while the defuzzification step incorporates a linear regression model to shift the domain from input to output domain. The fuzzy model is employed to formulate an optimal control problem for single rate as well as multi-rate systems. Simulation study on a multivariable semi-batch reactor system reveals that the proposed PDDF modeling approach is capable of capturing the nonlinear and time-varying behavior inherent in the semi-batch system fairly accurately, and the results of operating trajectory optimization using the proposed model are found to be comparable to the results obtained using the exact first principles model, and are also found to be comparable to or better than parameterized data-driven artificial neural network model based optimization results.     

轴承座工艺及模具设计要点分析

本公司某产品零件中存在着轴承座,如果采用传统的工艺,就需要花费较长的周期和较高的成本,并且大批量生产的要求也不能够满足。针对这种情况,就需要对工艺进行创新。分析了轴承座的工艺,然后介绍了模具的设计要点,希望可以提供一些有价值的参考意见。     

SymmSketch: Creating symmetric 3D free-form shapes from 2D sketches

Computational Visual Media - This paper presents SymmSketch—a system for creating symmetric 3D free-form shapes from 2D sketches. The reconstruction task usually separates a 3D symmetric...     

无序光斑电势中玻色凝聚气体的安德森局域化

基于Gross-Pitaevskii（G-P）平均场能量泛函，运用分步傅里叶方法研究了可控的无序光斑电势中弱相互作用玻色凝聚气体的安德森局域化。研究结果表明：（1）类高斯指数型的试探函数在变分分析过程中取得了预期效果。（2）无序度η为1，相互作用强度κ为0.1的条件下，当电势特征强度Vs大于0.6倍化学势(0.6μ)时，凝聚气体在演化过程中能够保持稳定的局域化状态。（3）较大的原子间相互作用(κ大于5)对安德森局域化的稳定性产生不利影响。（4）Vs为0.6μ，κ为0.1的条件下，光斑电势的无序度η越大，凝聚气体的安德森局域化越明显。     

特高压线路潜供电流的仿真计算

建立了1 000 kV双端电源输电线路模型,利用EMTP仿真计算加装快速接地开关(HSGS)前后和加装带中性点小电抗的并联电抗器前后潜供电流的幅值,结果显示,加装带中性点小电抗的并联电抗器限制潜供电流的效果更优.分析了接地过渡电阻的取值和线路载流量对潜供电流的影响,结果表明两者对补偿前的潜供电流影响很小,对于加装HSGS后,线路载流量的影响依然很小,而接地过渡电阻的取值对潜供电流影响较大,潜供电流随接地过渡电阻增大而减小.分析显示,对于某特高压示范线路,HSGS的接地电阻选取小于1.5Ω时较合理,中性点小电抗取为150Ω左右时潜供电流和恢复电压出现最小值.对1 000 kV的长线和短线分别仿真,可知线路越长,潜供电流越大.     

阅读疗法的哲学和心理学分析

阅读作为心理治疗的一种方法有着深厚的哲学和心理学依据。从阅读目的的角度来分析，阅读疗法的哲学基础就是诠释学——把不清楚的东西弄清楚，把隐藏的东西显示出来，从而解决心理疑惑；从弗洛伊德的心理动力学、认知不协调、皮亚杰的建构结构观及自我同一性理论的角度来分析，阅读是达到心理要求、满足心理平衡的重要手段。     

音乐声频对3种露地作物的应用试验研究

采用自行开发的植物声频设备播放古典音乐与蟋蟀鸣声混合而成的声频,对西瓜、花生和萝卜3种露地作物进行了试验。试验结果表明,声频试验15d后西瓜平均每株总藤长增长55.9cm,平均增长率为11%,抗病性增强,西瓜提前8d采摘;花生株高在15d后增长0.41cm,平均增长率为8.5%,平均增产186.6kg/0.0667hm2（亩）,增长率为23%;萝卜的全株鲜重提高585.5kg/0.0667hm2,增长率为14.1%,其中萝卜（头）平均提高345kg/0.0667hm2,增长率为12.35%;萝卜叶平均提高240.5kg/0.0667hm2,增长率为19.15%。这表明以古典音乐和蟋蟀鸣声混合的声频对促进植物生长、提高产量、增强抗病等方面具有明显的作用。     

基于Pro/E渐开线圆柱齿轮的变参设计

介绍Pro/Engineer Wildfire的渐开线直齿圆柱齿轮的变参数设计。该方法以中文交互式输入齿轮参数,完成目标齿轮的三维模型构建,降低建模难度同时又提高设计效率,为齿轮系的运动仿真分析奠定基础。