在1973年5月无人空间站到达轨道前不久，空气动力压力扯破了一个流星体和挡热板。 分析：首先，从逻辑上看，说：“空气动力压力扯破了一个流星体”，是不合事理的，荒谬可笑的。
Shortly before the uninhabited space station reached orbit in .May 1973,aeroaynamic pressure ripped off a meteoroid and heat shield.
科学家已经分析了奥特云中的彗星，并得出推论称，其中25%的彗星在它们改变运行轨道前，需要至少木星大小的星体提供推动力。
The scientists have analysed the comets in the Oort cloud and deduced that 25 per-cent of them would need a nudge by a body of at least Jupiter size before they changed orbit.
并且进一步分析了不同土体阻尼比、扣件刚度、支座刚度对轨道隧道结构的动力响应影响。
This paper analyzes the effect of different soil damping ratio, fastener stiffness and support stiffness to the dynamic responses of the track tunnel structures.
结果表明，运用所建立的落轴冲击有限元计算模型分析轨道结构动力性能，直观有效。
The results show that it is more intuitive and effective to study the track dynamic performance by the presented wheel-load-drop FEM model.
应用轮轨系统动力学的频域分析方法，研究了轨道刚度对轨道动力特性的影响规律。
The effects of track stiffness on track dynamic characteristics were investigated by the wheel-rail system dynamic analysis in frequency domain.
这种分析的概念的基础是将所观察到的神经元活动抽象成用非稳定周期轨道的分级所描述的动力学图。
The conceptual foundation of this analysis is the abstraction of observed neuronal activities into a dynamical landscape characterized by a hierarchy of "unstable periodic orbits" (UPOs).
用有限元法分析了板式轨道在移动荷载作用下的动力响应。
A finite element method was applied to analyze the dynamic response of slab track subjected to a moving load.
针对列车走行的实际情况，将轨道-路基作为参振子结构纳入车辆计算模型，建立了车辆-路基系统的垂向耦合动力分析模型。
In connection with the train running, the track subgrade being regarded as a part of the vibration structure of vehicle model, a vehicle subgrade model of vertical coupled system has been established.
结论非稳定周期轨道可以刻划hrv的动力学性质，是分析HRV的潜在的方法。
Conclusion UPOs can be used to characterize the dynamics of HRV and is a potential method to analyze HRV.
为刻划心脏节律存在的确定性动力学特征，运用不稳定周期轨道分析方法对健康青年人的RR间期时间序列数据进行分析。
To characterize the deterministic dynamics in heart rhythm, the unstable periodic orbit analysis were the RR interval time series of healthy young men.
以往的车桥耦合振动分析在轨道模型的建立和桥轨动力耦合作用上没有详细考虑，难以较为真实地模拟轨道—桥梁相互作用关系。
People in the past study did not think over the participation of the rail, so it was difficult to accurately simulate the interaction of rails and the bridge.
分析落轴冲击对轨道结构产生的动态响应，比较弹性支承块及短轨枕埋入式整体道床轨道结构的动力性能，并用现场实测数据进行验证。
The track dynamic characteristic, which is verified by the on-the-spot experiment, is compared between the Low Vibration Track(LVT) and the short sleeper buried ballastless track.
对所得仿真数据利用求和取平均的方法去除摄动力产生的短周期效应，通过分析去短周期项后的数据揭示出逆行地球同步轨道的演变特点。
Numerical solutions are periodically summed and averaged to get rid of short-periodic-term effects. By analyzing polished data, its orbit characteristics are revealed to us.
对基于C-W方程的悬停动力学模型进行了精度分析，最后以低轨道航天器的八面体编队构型为例进行了数学仿真验证。
The precision of hanging dynamic model based on CW equation was analyzed in detail, and a low earth orbit satellite octahedron configuration was simulated for validation.
在只考虑轨道动力学的情况下，分析了太阳帆的被动控制。
With passive control, the solar sail orbit is stable and its initial momentum determines the orbit parameters.
道床刚度时轨道的横向振动影响较大，从理论上分析了钢轨和轨枕的动力响应与轨道横向刚度之间的关系。
The lateral stiffness of ballast affects the lateral vibration greatly. This paper analyses theoretically the dynamic response of rail and sleeper vibration under different stiffness.
为分析弹性钢轨扣件轨道的轮轨作用力，通过建立地铁车辆弹性扣件动力分析模型，分析了扣件刚度、列车运行速度等对轮轨作用力的影响。
This paper sets up a dynamic analysis model of subway vehicle-elastic fastener and analyzes the influence of fastener stiffness, train operation speed on the wheel-track force.
分析认为PPT是一种先进的小推力动力装置，特别适合于微小卫星的轨道转移、姿态控制、位置保持以及星座编队飞行。
It was showed that PPT was a kind of advanced propeller with small thrust, which was suitable to orbit transfer, attitude control, station keeping and formation flying for small and micro satellite.
分析了多边形车轮在板式轨道下对直线电机车辆动力学性能的影响。
This thesis develops a coupling dynamics model for LIM vehicle and slab track to investigate the influence of polygonal wheels on dynamic behavior.
分析了多边形车轮在板式轨道下对直线电机车辆动力学性能的影响。
This thesis develops a coupling dynamics model for LIM vehicle and slab track to investigate the influence of polygonal wheels on dynamic behavior.
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