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速度最优的

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Laser Doppler Anemometry was used to measure the velocity in volute and impeller of the pump. Three velocity components magnitudes were obtained, so was the mean square root fluctuating value.

运用激光多普勒测速仪,对旋流泵最优工况下的无叶腔及叶轮内部速度场进行了测量,得到周向速度、轴向速度、径向速度及其对应的均方根脉动速度分布等。

Driver system for the stability of nonlinear and non-use of the theory of linear quadratic control law studies, select the ball location, speed and rod angle, angular velocity of the four variables as state variables, output variables for the ball position and bar angle, the establishment of linear state space equation and after the designs of clubs based on LQR control law, the design process simple and easy to realize the control law, simulation results show that the linear quadratic regulator robustness and stability.

球杆系统翻译,求高人针对球杆系统的非线性和不稳定性运用最优二次型理论进行控制律的研究,选取小球位置、速度和横杆角度、角速度四个变量为状态变量,输出变量为小球的位置和横杆的角度,建立状态空间方程并进行线性化后设计了基于LQR的球杆系统控制律,设计过程简单,控制律的实现容易,仿真结果表明了最优二次型调节器的鲁棒性和稳定性。

To overcome the premature of simple genetic algorithm, the calculating efficiency of SGA is improved by the following two ways; Firstly, in order to ensure convergence of algorithm and reduce influence factor of convergence, elitist selection and adapted crossover and mutation operator are adopted. Secondly, because this study deals with finding minimize volume of structure, to quicken convergence of this problem, in line with mechanics criterion the paper carry out mutation to some genes in chromosome according to variations of internal force. This will let algorithms to search answer with our hoping directions.

针对基本遗传算法存在早熟的问题,本文主要从两个方面进行了改进,首先为了保证算法的收敛和减少影响算法收敛因素,采用了最优保护策略和自适应的交叉和变异算子;其次,由于本文研究内容涉及求结构最小体积问题,为了加快此类问题的收敛速度,本文结合结构优化中的力学准则,对个体染色体中的某一段基因按照内力变化进行变异操作,使得算法按一定方向进行搜索最优解。

The advantage of this measure is that the optimum rational reparameterization's parametric speed satisfies that the maximum deviation from unity is the minimum in this family.

利用该方法求得的最优参数化在曲线的重新参数化曲线族中,参数速度偏离单位速度的最大值达到最小。

It is improved to solve the prematurely and stagnation problems of traditional Ant Colony Optimization in the paper. First, mean value method is used to update pheromone to avoid premature convergence which leads to non-globally optimal solution. Second, Pheromone is updated by Best Track to speed the rate of convergence which will help to avoid locally optimal solution.

本文针对基本蚁群算法比较容易陷入早熟和停滞,对现有蚁群算法的信息素更新规则进行了改进,一是采用平均值法更新信息素,避免算法过早收敛于非全局最优解;二是采用最佳路径法更新信息素,可加快收敛速度,并使算法跳出局部最优解。

In this paper, a path planning method based on GA is presented. Firstly, the model of the space robot is built to display the mapping of the end velocity and the joint velocity. Then the optimal algorithm based on genetic algorithm is presented to search the optimal solution which minimizes the disturbance of base attitude in the feasible solution space. Finally, an illustrative example is used to verify the feasibility of the algorithm.

基于GA研究机械臂运动对基座的姿态扰动问题,首先,建立空间机器人的运动学模型及空间机器人末端与关节速度之间的映射关系;接着,应用GA作为最优化算法,在空间机器人可行解空间中,寻找最优解得到最优路径,以达到对基座姿态干扰最小的目的;最后,通过数值仿真实验验证算法的实用性。

A new crossover operator is proposed to keep goad genes and enhance the search performance. Local search mechanism is added into GA to find solutions for TA problems with a more rapid convergence speed. Simulated annealing is used to overcome the problem of local optimum. A heuristically greedy local search is also proposed to improve the search efficiency. The simulation results show that the improved algorithm can improve the search efficiency of GA.

构造了适合于目标分配问题的染色体;设计了搜索性能较好且能够保留优秀基因的交叉操作方法;将局部搜索机制引入标准遗传算法,提高了目标分配算法的收敛速度;把模拟退火算法引入局部搜索问题,在一定程度上避免了局部最优问题;将贪婪算法应用于局部搜索提高了最优分配方案的搜索效率。

Aiming at a typical complex electromechanical system—temper mill, the study takes its main driving control system as object of study, works out such a difficult problem that many parameters are coupled mutually, hard to be set and configurated in complex electromechanical system, and makes the performance goal of the control system be optimal in the adjustable ranges of parameters.

分析了遗传算法和模拟退火算法寻优性能和各自的不足与局限性,将两种算法巧妙地结合起来加以修正、取长补短构成新的退火遗传算法,提高了算法的整体寻优性能;并以典型的复杂机电系统—平整机为研究对象,以其主传动速度控制系统为切入点,应用退火遗传算法,解决了复杂机电系统中多参数、相互耦合、难于整定和组态的难题,使控制系统的性能指标在参数可调范围内达到最优。

Based on the optimum quadratic performance index, the optimum guidance law is deduced to make sure the landing velocity and angle of warhead.

基于常值最优二次型指标推导得到了对弹头落地速度以及落地角度有所保证的最优制导律。

The sightline control strategy for bad measure precision is developed, and the control methods for vertical direction, approach direction and station keeping are presented.(2)The safe approach velocities are investigated for cuboid, sphere and cone keep out zone.(3)The design method for optimal trajectory under safety constraint is developed. The cone and cuboid keep out zone can be described using line constraint, and then optimal trajectory design can be translated to line programming problem under line constraint.(4) The design strategy of collision avoidance maneuver is discussed, and the collision avoidance scheme is analyzed for V-bar and R-bar approach.The control and trajectory safety in departure phase are investigated.

1提出了测量误差较大时平移靠拢段的视线控制策略,给出了横向、纵向和悬停的控制方法;(2)针对长方体禁区、球形禁区和锥形禁区三种禁区形式,研究了V-bar逼近和任意方向逼近的纵向安全速度计算问题;(3)提出了安全约束下的最优轨迹设计方法,将冲量和有限推力作用下的最优轨迹设计问题转化为线性规划问题,并给出了将锥形和方形安全区域约束转化为标准线性约束的公式;(4)探讨了紧急避撞机动的设计策略,分析了V-bar和R-bar接近的紧急避撞机动方案。

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然而,正如其名字所指出的那样,CD盘不能写,也不能用任何方式改变其内容。

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