基于粒子群算法的越野车悬架参数优化

针对基于平顺性的悬架参数优化问题,建立了越野车后悬架系统参数优化的数学模型,包括优化变量、目标函数和约束条件,设计和应用了三种改进的粒子群算法,线性时变惯性权重粒子群算法、随机惯性权重粒子群算法和时变加速因子粒子群算法,来对车辆悬架平顺性进行优化,并与遗传算法对比。仿真结果表明,时变加速因子粒子群算法在收敛速度和收敛精度上都明显高于其他算法,优化后的车辆平顺性大大提高。     

改进粒子群算法在柔性作业加工时间问题研究

为了减少柔性作业加工时长，在柔性作业加工问题中，提出一种改进粒子群算法(β-PSO)。该算法以最小加工时间为目标函数，惯性权重幂函数自适应调节，随机数采用贝塔分布进行改进，选取Kacem算例进行验证，通过对比β-PSO算法与标准粒子群算法(PSO)、余弦惯性权重改进粒子群算法(CPSO)的优化结果，β-PSO算法加工时间均较低。实验结果表明，β-PSO算法在减少柔性作业加工时间问题上的有效性。     

基于改进粒子群算法的数控加工参数优化研究

为优化数控加工参数,提高数控机床加工性能,研究改进粒子群算法的数控加工参数优化方法,设置最低生产成本以及最高生产率为数控加工参数的优化目标,利用协调系数将多目标优化问题转化为单目标优化问题建立目标函数,设置切削速度、进给量约束、切削进给力、切削功率、切削转矩约束、表面粗糙度要求为约束条件,采用惯性权重值适应性递减方法改进粒子群算法,令惯性权重随粒子群进化适应性提升,采用改进粒子群算法快速寻找数控加工参数目标函数最优值,实现数控加工参数优化.实例分析结果表明,该方法可有效优化数控加工参数,满足实际加工需求,优化后的实验数控机床加工性能佳.     

基于改进粒子群算法的数控加工参数优化研究

为优化数控加工参数,提高数控机床加工性能,研究改进粒子群算法的数控加工参数优化方法,设置最低生产成本以及最高生产率为数控加工参数的优化目标,利用协调系数将多目标优化问题转化为单目标优化问题建立目标函数,设置切削速度、进给量约束、切削进给力、切削功率、切削转矩约束、表面粗糙度要求为约束条件,采用惯性权重值适应性递减方法改进粒子群算法,令惯性权重随粒子群进化适应性提升,采用改进粒子群算法快速寻找数控加工参数目标函数最优值,实现数控加工参数优化.实例分析结果表明,该方法可有效优化数控加工参数,满足实际加工需求,优化后的实验数控机床加工性能佳.     

粒子群优化算法中惯性权重的研究

惯性权重是粒子群优化算法中的关键参数,文章对惯性参数进行了系统的研究,在此基础上,分析了固定权重,典型的线性递减惯性权重,步长较小的线性递减惯性权重时收敛性能的影响.通过对4个测试函数的仿真实验,验证了它们各自的全局收敛性和收敛速度,说明了惯性权重在粒子群优化算法中有很大的自由度.     

改进粒子群算法在行星传动设计中的应用

介绍了一种改进的粒子群算法。通过动态改变惯性权重，使其随粒子群的位置和目标函数的性质而变化，正确控制搜索的步长，达到增强算法的搜索能力，提高收敛速度，避免陷入局部搜索的目的。将该方法应用于行星齿轮传动优化中取得了良好的效果。     

加工参数优化中自适应协同粒子群算法研究

针对加工参数优化过程中粒子群优化算法的优化效果受参数影响较大的问题,提出了自适应协同粒子群优化算法。对粒子群优化算法的参数对优化结果的影响进行了详细而深入的分析,在此基础上,给出了优化过程中惯性权重、学习因子、最大速度等参数的变化规律,并通过仿真的方法确定了最优参数的取值。最后通过对基准函数的仿真实验,验证了本文算法的正确性和有效性。     

增加算子扰动项的粒子群优化算法研究

为了提高粒子群算法的稳定性,改善陷入局部最优的弊端,提出了一种增加算子扰动且对惯性权重进行正弦调整的粒子群优化算法。该方法首先利用差分方程对粒子的速度与位置变化过程进行深入分析,然后找到粒子群算法收敛的约束条件,进而获得改进后的惯性权重。最后在粒子群算法的速度公式中引入算子扰动项,其对粒子施加扰动,能够有效的抑制算法陷入局部最优问题,使算法在迭代后期也拥有一定的搜索能力。利用4个典型测试函数对算法进行验证,实验结果表明改进的惯性权重及速度更新公式使得该算法具备了较快的收敛速度和较佳的全局收敛性能,与标准粒子群算法相比,改进后的粒子群算法收敛精度高、鲁棒性强。     

随机权重粒子群算法优化磁轴承系统

为了提高单自由度主动磁悬浮轴承系统的稳定性,采用随机权重粒子群算法与传统PID控制相结合的方法,将随机权重粒子群算法与线性递减权重粒子群算法进行函数测试对比,结果表明,随机权重粒子群算法能够更快、更准确地找出优化函数的最优值。通过MATLAB/Simulink构建系统模型并进行仿真对比,证明随机权重粒子群算法可以更好地提高系统的稳定性。     

基于贝叶斯粒子群算法的控制权重矩阵优化

研究了线性二次型调节控制权重矩阵的优化问题。研究了粒子群算法的基本原理及其特点。在传统粒子群算法中引入了贝叶斯思想,利用贝叶斯判别法的基本思想对参加优化的粒子进行预处理,对粒子群算法中的粒子移动速度与方向的损失函数依概率加权平均,并将贝叶斯粒子群算法应用于二次型控制权重矩阵的优化中,提升了权重矩阵优化的收敛速度。通过仿真实验验证了贝叶斯粒子群算法的有效性。     

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...     

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.     

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。     

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....     

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...     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.     

Multiple-tapped-delay-line hardware-linearisation technique based on wire load regulation

This article describes designing, implementation and tuning processes of multiple-tapped-delay-line (MTDL). Obtained MTDL can be implemented in various field-programmable-logic-devices (FPGA) devices and applied for time-to-digital-converters (TDC) construction. The task of tuning process is the tapped-delay-line (TDL) linearisation, and consists of two stages. The first stage depends on selecting an appropriate configurable-logic-block (CLB) for particular delay-segment realization and selecting proper connection between these blocks. The second tuning stage, that is essential from this article viewpoint, depends on inter CLBs connecting wires delay regulation realized directly by load regulation. The Load regulation depends on connecting an appropriate number of unused three-state-buffers or CLB inputs to the wire which delay is adjusted. Depending on the number of inputs connected to the wire its capacitance changes that influences its time-constant and finally changes its time-delay.The MTDL mathematical model, obtained characteristics and results of time-interval (TI) measurements are also presented. The derived TDL model provides information about how the particular wire delay should be changed and in which order the changes should be executed. This makes the designing process predictable and easy to carry out. Presented characteristics confirm the proper operation of presented linearisation technique. The proper operation of the whole measuring module is confirmed by obtained TIs histograms presentation.     

Quantum Entanglement and Cryptography for Automation and Control of Dynamic Systems

This paper addresses the application of quantum entanglement and cryptography for automation and control of dynamic systems.A dynamic system is a system where t...     

原子力显微镜在生物分子间相互作用力的研究

近年来原子力显微镜在测量生物分子间的相互作用力方面取得显著的进步。本文综述原子力显微镜原理以及在生物分子间相互作用方面的研究,为人们理解分子的识别进程,提供一个新的研究方法。