基于局部搜索策略的混合自适应布谷鸟算法

为了提高布谷鸟算法的搜索精度和全局收敛速度,提出一种基于局部搜索策略的混合自适应布谷鸟算法。在该改进算法中,每个当前解的周围随机产生一个局部种群,利用正余弦算子的局部寻优能力得到局部最优解,并用局部最优解替换当前解,以提高局部搜索精度;同时采用自适应发现概率和搜索步长替代布谷鸟算法中的固定发现概率和搜索步长,以提高算法的全局收敛速度。对25个经典高维基准函数进行实验表明,所提算法在收敛速度和求解精度上优于布谷鸟算法,通过将其应用于拉压弹簧、三杆桁架设计和0-1背包问题,验证了算法的有效性。     

一种求解Job-Shop调度问题的量子遗传算法

提出了一种基于操作方式进行编码和解码的量子遗传算法,并将其用于求解一种典型的NP-hard组合优化问题即Job-Shop调度问题.该算法采用量子比特方式构造染色体,增加了算法的种群多样性和计算并行性;采用量子旋转门操作实现种群进化,有效地提高了算法的收敛速度.用基准调度问题实例对该算法进行的测试结果表明:该量子遗传算法与改进的遗传算法相比较有更好的优化性能.     

求解生产批量计划问题的改进量子进化算法

针对遗传算法和粒子群算法在求解生产批量计划问题中易陷入局部最优解的问题,提出了改进的量子进化算法.对各周期项目计划产量的决策变量进行基于概率幅的量子比特个体编码,在迭代求解的过程中通过约束违反度比较个体的支配关系,有效指导种群向合理解进化,并根据当前迭代次数动态调整旋转角机制控制基因位的坍塌速度,在进化后期尽量保留最优个体的基因信息以提高算法的收敛速度和求解精度.实验结果表明了该算法的有效性.     

基于量子位实数编码的优化算法及轧制规程多目标优化

针对热连轧轧制规程优化问题,以等功率裕量和轧制能耗为优化目标函数建立热连轧轧制规程多目标优化模型,提出基于量子位实数编码的热连轧轧制规程多目标优化算法。该算法将免疫遗传算法框架与量子计算思想相结合,采用量子位实数编码,利用量子态干涉进行遗传算子的交叉和变异,同时保证非支配解按拥挤距离选择优势免疫抗体种群,得到 Pareto 全局最优解集。以某轧钢厂热连轧精轧机组为例,验证本文所提及算法的有效性。实例分析表明,所提及的算法在寻优能力和收敛速度上均优于传统的NSGA-II算法,能够获得更好的Pareto解集,有效地解决热连轧轧制规程多目标优化问题,改善了轧制能耗。     

机构综合的混沌搜索自适应入侵遗传算法研究

将生物系统中"入侵"的概念引入遗传算法,提出机构综合排斥二周期点优化求解的一种基于混沌搜索自适应入侵遗传算法.该算法动态地引入入侵种群,并利用混沌搜索产生入侵个体.入侵种群的扩散使优良基因得以在个体中传播,优化了种群的基因构成,能够促使种群跳出局部最小,并向全局优化方向进化,从而有效避免了遗传算法的早熟现象.将该算法应用排斥二周期点优化求解,实例表明该算法具有较快的收敛速度和较强的寻优能力,能够快速求出机构综合问题非线性方程组全部解.     

求冗余机器人手臂逆解的反向认知果蝇优化算法

为了解决冗余机器人手臂逆解求取中存在的计算量大和求解精度较低等问题,提出一种基于反向认知果蝇优化算法(RCFOA)的解决方法。RCFOA在果蝇算法(FOA)算法的基础上,在进化方程中增加"反向认知"策略,即添加向最差个体学习的改进策略优化进化方程,增强算法跳出局部最优、寻找全局最优的能力。对经典测试函数的仿真结果表明,RCFOA具有更好的全局搜索能力,在收敛速度、收敛可靠性及收敛精度,比其FOA有较大的提高。在机器人手臂逆解求解应用中,能够有效提高精度和稳定性,是求解机器人手臂逆解的一种有效方法。     

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.     

基于混合遗传算法的MTSP问题研究

为了得到多旅行商问题的优化路线,提出一种基于实数编码的混合遗传算法.即先建立数学模型,将多旅行商问题转化为单旅行商问题,然后详细介绍了混合遗传算法设计过程,同时对该算法进行了收敛性分析与仿真试验.结果表明基于实数编码的混合遗传算法是一种有效的多旅行商问题求解方法,该算法能以较大的概率获得全局最优解.     

基于混合遗传算法的混合动力汽车优化设计研究

针对混合动力汽车驱动系统参数优化设计问题的特点,将自适应遗传算法与序列二次规划算法相结合,构成用于求解该问题的混合遗传算法.一方面该算法提出了新的自适应交叉和变异概率调整公式,以保证全局收敛性.另一方面通过改进自适应遗传算法与序列二次规划算法的结合方式,以加快局部搜索的速度和求解质量.实例优化结果表明,该算法提高了收敛速度和求解精度,保证了全局收敛性,在混合动力汽车驱动系统参数优化设计中的应用是有效的.     

基于混合遗传算法的MTSP问题研究

为了得到多旅行商问题的优化路线，提出一种基于实数编码的混合遗传算法。即先建立数学模型，将多旅行商问题转化为单旅行商问题，然后详细介绍了混合遗传算法设计过程，同时对该算法进行了收敛性分析与仿真试验。结果表明基于实数编码的混合遗传算法是一种有效的多旅行商问题求解方法，该算法能以较大的概率获得全局最优解。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.