查询词典 trajectory

School of Astronautics,Northwestern Polytechnical Univ.,Xi'an 710072,ChinaAbstract:With the issue that the intuitiveness of results is not good in the majority of present research on trajectory planning,the optimal 3D trajectory is planned forhelicopter based on the pretreatment of digital map.

针对目前大多数航迹规划研究中航迹规划结果直观性较差的问题，以直升机为对象，在对数字地图预处理的基础上规划其最优三维航迹。

The method applies the progressive optimization theory to derive preview control input based on minimalization of performance index of trajectory error area between desired and actual trajectory, the feature of preview control input is that feeback and preview feedforward coefficients are changed in every sampling time.

该方法从目标路径与实际路径之间的面积误差评价函数值最小化观点出发，运用逐次最优化原理来求取最优预见控制输入。

We investigate phenomenologically effects of the flavor-dependent quarkonia annihilation on the meson-meson mixing, and find that corrections due to the flavor-dependent quarknoia annihilation can be described by the constituent quark masses in the mixing model which holds for all the meson nonet. We also study the relation between Regge trajectory and meson spectrum, and therefore concluded that the quasi-linear Regge trajectory with the requirements of additivity of intercepts and inverse slopes can describe the meson spectroscopy with good accuracy, and it also holds for the radial excited mesons except for the bbbar mesons.

我们唯象地研究了味道有关的夸克偶素湮灭效应对混合的影响，发现味道有关的夸克偶素间的湮灭引起的修正可以通过组分夸克的质量来描述，考虑这种修正的混合模型可以用于所有的介子九重态；我们也研究了Regge轨迹和介子质量间关系，发现满足截距相加及斜率倒数相加的准线性Regge轨迹可以很好地描述介子的质量，除bbbar外，线性Regge轨迹也可以很好地描述介子激发态的质量；最后，我们借助于赝标介子和标量介子，讨论多个共振态的混合及衰变。

Based on these analytical solutions, the equations of the optimal transfer trajectory are obtained, and the relationship among this trajectory, the desired relative orbit, and the optimal impulses is shown.

在最优解的基础上导出并分析了两冲量建立时的最优转移轨迹方程，揭示了最优转移轨迹与作用冲量、目标相对轨道之间的关系。

This article discusses optimal preview tracking control of plane object trajectory and optimal preview tracking control of space three dimensions object trajectory by qualitative and quantitative analysis, and then put forward the algorithms of optimal preview control.

本文分别对平面轨迹最优预见跟踪控制和空间三维轨迹最优预见跟踪控制进行了定性、定量的分析，最后提出了最优预见控制的算法。

So me middle points in the path were determined by means of teaching,other points i n path were defined by interpolation calculation of five order polynomial,the ob jective trajectory can be obtained conveniently and in time for robot trajectory planning in joint coordinate system.

为了保证搬运机器人在整个作业过程中运行平稳、连续，在关节变量空间直接进行轨迹规划，通过示教的方法，确定路径所经过的几个中间点。

The optimum solution is gotten by Joint limitation avoidance, then the joints trajectory can be obtained by interpolation calculation of three order polynomial, finally PTP trajectory in joint coordinate system is planned.

过去，对控制系统进行仿真，只能建立一个数学模型，仿真的结果是一堆抽象的数据。

The chattering mode in the dynamic process of the unforced switched systems isinvestigated. The relations between the rotation directions of trajectory, the increase ordecrease the polar radius of trajectory, and the convergent chattering mode are revealed.

分析了二阶切换线性系统的收敛震颤现象与相轨迹的旋向以及相轨迹极半径增减趋势之间的关系，进而得到忽略切换延迟时二阶切换线性系统出现收敛震颤模态的充分条件。

In this paper,an optimum trajectory from perilune to lunar surface is derived in terms of Pontryagin's maximum principle,which is an open-loop way.Then,an optimal nonlinear control law based on an fuzzy neural network is presented,on the basis of the optimum trajectory,due to the nonlinear mapping function of the fuzzy neural network,which is a closed-loop way.

本文根据终端着陆条件和性能指标，以由Pontryagin's极大值原理得出从近月点到月球表面的最优着陆轨迹为基础，给出一种基于模糊神经网络的非线性最优控制策略，使被控系统能够通过模糊神经网络的非线性映射能力实现某种最优的闭环制导控制。

Taking range as the performance function, considering end velocity, height and trajectory slope angle constraints, the optimal glide trajectory was solved by maximum principle of Pontryagin and conjugate-gradient method.

建立了滑翔弹道模型，以射程为指标函数，考虑终端速度、高度和弹道倾角约束，采用庞特里亚金极大值原理和共轭梯度法求出控制变量有约束的最优滑翔弹道，简要分析了滑翔增程机理。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。