应用混沌粒子群算法求解工程优化问题

针对工程优化设计问题,提出了基于混沌粒子群算法的工程约束优化问题求解方法.CPSO算法利用混沌搜索的全局遍历性、随机性和规律性等特点,引导粒子在全局范围内搜索,从而克服了传统粒子群算法早熟收敛的缺点.该算法以种群适应度方差作为粒子群优化算法早熟收敛的判据,并用惩罚函数法处理违法约束的粒子,当基本粒子群算法陷入早熟时,随机选择粒子群中的部分粒子实施混沌搜索,直至满足迭代收敛条件为止.CPSO算法能提高种群的多样性和粒子搜索的遍历性,从而有效提高了PSO算法的收敛速度和精度.两个工程约束优化实例的求解结果表明,该算法的优化结果最好,收敛速度也比较快.     

基于混沌粒子群优化的神经网络在旋转机械故障诊断中的应用

基于混沌粒子群优化算法提出一种根据群体早熟收敛程度和个体适应值来调整惯性权重的自适应混沌粒子群优化算法,算法兼顾全局寻优和局部寻优,能够有效地避免早熟收敛.使用自适应混沌粒子群优化算法训练神经网络并建立旋转机械故障诊断模型,实验结果表明,与粒子群优化算法、遗传算法训练神经网络相比,基于自适应混沌粒子群优化算法的神经网络能够有效改善神经网络的训练效率,提高故障模式识别的准确率.     

混沌w的简化粒子群算法在机械设计中的应用

利用混沌序列的内在随机性、遍历性和规则性,提出了一种混沌惯性权重的简化粒子群优化算法.将该算法应用于机械设计,结果表明新算法具有更快的收敛速度和更强的全局寻优能力.     

基于混沌序列的起重机箱形主梁粒子群优化

为了解决起重机箱形主梁优化设计中的多变量、多约束问题,提出了一种新的基于混沌序列的粒子群优化算法。利用混沌变量的遍历性和随机性,通过Logistic映射生成初始粒子群位置。根据平均粒距描述种群的多样性,通过混沌扰动对早熟个体进行局部搜索,从而跳出局部极小点。起重机箱形主梁优化试验结果表明,新混沌粒子群算法具有收敛速度快,优化精度高的优点。     

混合优化算法在氧化铝生产中物料平衡计算上的应用

通过分析传统的单一优化算法所存在的优点与不足,成功将粒子群算法、混沌优化以及单纯形法3种优化算法有机结合起来,提出一种基于混沌-单纯形法的混合粒子群协同优化算法,加强粒子群的局部寻优效率和全局寻优性能,以提高搜索速度和成功率.Benchmark 函数仿真以及氧化铝生产中拜耳法物料平衡计算的最终结果表明:新算法不仅在稳定性和收敛性上优于传统粒子群算法和相应的改进粒子群优化算法,且具有较高的收敛速度和全局收敛能力,同时也是进行物料平衡计算的一种有效的方法.     

基于改进粒子群算法的复合材料机翼结构布局优化设计

采用粒子群算法对复合材料机翼结构进行布局优化求解.针对粒子群算法的早熟收敛现象,采用了两种改进措施:根据粒子的浓度变异粒子以增加粒子种群多样性;将变尺度混沌优化方法结合到粒子群算法中用以变异搜索最优粒子.算例结果表明,文中所提优化方法是可行有效的.     

自适应粒子群求解资源动态分配项目调度问题

为了解决传统任务资源固定分配难以实现动态与高效调度的问题,建立了任务资源动态分配项目调度的数学模型,给出了任务调度方案的生成算法。为了克服基本粒子群优化算法的早熟收敛问题,平衡其全局与局部搜索能力,提出了一种改进的自适应粒子群优化算法,该算法采用惯性权重因子周期性衰减和改进的变异策略以及不变位交叉法实现粒子的更新。最后对通用标准库进行了测试,结果表明,所建模型和改进算法能够有效地缩短项目工期,提高资源利用率和算法效率。     

机电产品管路自动敷设的粒子群算法

基于粒子群优化算法提出一种机电产品三维管路自动敷设算法,该算法以预处理和优化搜索为基本框架。在预处理阶段,利用混沌技术,建立混沌栅格预处理模型。三维管路敷设空间经过混沌栅格预处理模型处理,可有效地降低管路自动敷设算法的求解复杂度。在优化搜索阶段,通过分析粒子群算法和人口迁移的特点,提出改进粒子群算法。改进粒子群算法针对粒子群算法收敛速度慢、容易陷入局部极小的缺点,提出子空间局部搜索、解空间全局搜索和补空间开拓搜索。基于混沌栅格预处理模型和改进粒子群算法,给出高效的管路自动敷设算法流程图。对比试验和改进粒子群算法的理论分析,表明该优化搜索算法具有较好的性能,并证明改进粒子群算法的收敛性。实例验证表明该算法的有效性和实用性。     

引入单纯形算子的粒子群优化算法在板形模式识别中的应用

将粒子群理论引入板形模糊模式识别系统，对识别后的板形进行优化，提高了板形识别的精度。粒子群算法作为一种全局优化算法，对于复杂优化问题，存在容易陷入局部极值的不足，因此，提出了粒子群和单纯形混合优化算法，将具有良好局部搜索能力的单纯形法与粒子群算法的全局搜索能力结合起来，有效地提高了板形模式识别优化的收敛速度，同时也提高了识别精度。     

混沌压缩非线性粒子群算法求解车间调度问题

针对大规模车间调度问题,提出了一种混沌压缩非线性粒子群算法。首先运用多种群策略增加粒子多样性,结合混沌策略和非线性策略改进惯性权重,以平衡全局和局部搜索能力,加快算法后期收敛速度;再引入压缩因子改进算法速度更新公式,加大算法前期搜索范围,以防止算法陷入局部最优;最后用6种车间作业经典算例分别对粒子群算法、遗传算法、灰狼算法和混沌压缩非线性粒子群算法进行检验。实验结果表明,该方法可以显著提升粒子群算法的收敛精度和速度,对于实际大规模车间调度问题适应性较好,能有效提高车间的生产效率。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.