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vertical impact     
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  垂直冲击
     For the flexible protection net used in railway passenger dedicated line paralleled the highway,the suggested values of the vertical impact energy was 9.3×104 J(general district) or 1.7×105 J(enhanced district) and the obligate deformation shouldn′t be less than 2.0 m.
     建议设置在铁路客运专线与公路并行区段之间的柔性防护网,其垂直冲击能量设计标准取为:一般区段9.3×104J,加强区段1.7×105J; 且柔性防护网预留变形空间的宽度以不小于2.0 m为宜。
短句来源
     With the theory of iterative mapping and stability analysis, the harmonic excitation response and periodic response stability of a vertical impact damper system is studied. First, the equation of parameter boundary of stable response is set up. General rules of transformation from stability to chaos are analyzed.
     运用迭代映射及其稳定性分析原理,研究了垂直冲击消振系统的简谐激励响应及其周期响应的稳定性.首先建立了稳定周期响应的参数区域边界方程,分析了稳定周期运动向混沌转变的一般规律.然后以典型的二阶主振系为例,得到了几个对消振效果影响较大的稳态周期响应区域的详细数值结果,讨论了稳态周期响应区域及附近的消振效果.
短句来源
     The experimental results showed that:(1)when the subjects jumped from the platform 1.0 or 1.5m high, the vertical impact force sustained by the total body's mass center with the half-squat posture was larger than that with the side spin posture.
     实验结果表明:<1>当平台高度为1.0和1.5米,用半蹲式着陆人体质心承受的冲击力大于用侧滚式姿势着陆; <2>人体质心承受的垂直冲击分力。
短句来源
     Calibrating Method and Experimentation of Vertical Impact
     垂直冲击试验及校准方法
短句来源
     Aiming at the impaction among granules of non obstructive particle damping(NOPD), the vibration absorption model for vertical impact of granules is established by adopting Hertz contact theory.
     针对 NOPD中微小颗粒之间的相互碰撞 ,以两端自由的等截面梁为研究对象 ,采用赫兹接触理论建立了多颗粒垂直冲击减振理论模型。
短句来源
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  立式冲击
     PWL-TYPE VERTICAL IMPACT CRUSHER
     PWL型立式冲击破碎机
短句来源
     Application Prospects of vertical impact crushers of LPX series in cement plant
     LPX系列立式冲击破碎机在水泥厂应用前景
短句来源
     Power Calculation and Motor Selection of Vertical Impact Crushers
     立式冲击破碎机功率计算方法与电机的选择
短句来源
     Feature and application of PL type vertical impact crusher
     PL型立式冲击破碎机的性能及应用
短句来源
     Analysis on Critical Speed of Rotor System of Vertical Impact Crusher
     立式冲击破碎机转子系统临界转速的分析
短句来源
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  立式反击
     Calculation and Determaination of Rotational Speed of Vertical Impact Crusher
     立式反击式破碎机转速的计算与确定
短句来源
     Dynamic Balance of Main Shaft of Vertical Impact Crusher
     立式反击式破碎机主轴动平衡计算
短句来源
     The theoretical formula of the rotational speed of the main shaft of a vertical impact crusher is obtained for the first lime by use of the probability machine design on the basis of the analyzing the operating principle and structural features of the machine.
     基于立式反击式破碎机工作原理与结构特点的分析,采用机械慨率设计的基本原理与方法,首次得到了立式反击式破碎机主轴转速的理论计算公式。
短句来源
     This paper discusses the calculation of rotor of vertical impact crusher byenergy theory and demonstrates the speed formula and its application
     利用能量原理对立式反击式破碎机转子转速的计算进行了探讨,并给出了转速的计算公式和使用方法
短句来源
  “vertical impact”译为未确定词的双语例句
     In the vertical impact group,serum MBP levels before the impact was(1.68±0.86) μg/L,which was significantly lower than that after the impact[(5.25±1.96) μg/L,t=3.226,P< 0.05].
     ②垂直打击组髓鞘碱性蛋白打击前浓度明显低于打击后浓度[(1.68±0.86),(5.25±1.96)μg/L,t=3.226,P<0.05];
短句来源
     The research results indicate that the maximum speed of the fuel elements passing the bending pipe is no more than 7.36m/s,the maximum vertical impact speed to the steel surface is no more than 1.08m/s,and all the results are in the design safety limits.
     结果表明,燃料元件通过弯管时最大速度不大于7.36m/s,对垂直钢表面最大撞击速度不大于1.08m/s,均符合设计安全限值的规定。
短句来源
     Analysis and Simulation of Vertical Impact Damper System
     垂直主振系冲击消振运动过程分析及仿真研究
短句来源
     A Numerical Simulation of the Vertical Impact of a Supersonic Flat-Head Body on a Water Surface
     超声速平头物体垂直撞水的数值模拟
短句来源
     The rabbits in vertical impact group received the impact of a hammer falling directly on the parietal bone of the skull.
     垂直打击组实施垂直打击,打击锤直接垂直撞击于颅顶骨上;
短句来源
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  vertical impact
Tests were carried out using a rotary and a vertical impact testing machines at various loading rates and temperatures.
      
Determination of the dynamic characteristics of fracture toughness on ring specimens in loading using a vertical impact tester
      
We propose a hand-operated device for simultaneous determination of the impact resistance and hardness of anticorrosive insulating coatings, which completely models the work of a U-1 standard vertical impact testing machine.
      
The plane problem on vertical impact of a rotating circular cylindrical shell against the surface of a liquid
      
The vertical impact of a rigid elliptical cylinder on a compressible liquid surface is considered in a plane asymmetric formulation.
      
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The purpose of this investigation is to study the possibility and condition for a lunar probe to hit or to fly over, at close range, any given region on the surface of the moon. We limit the ballistic speed of the vehicle to 11.2 km/sec and require that the height at the last burn out point should be about a few hundred kilometres. Six definite regions on the surface of the moon are considered as the objectives of these flights. Four regions lie on the great circle where the orbital plane of the moon cuts the...

The purpose of this investigation is to study the possibility and condition for a lunar probe to hit or to fly over, at close range, any given region on the surface of the moon. We limit the ballistic speed of the vehicle to 11.2 km/sec and require that the height at the last burn out point should be about a few hundred kilometres. Six definite regions on the surface of the moon are considered as the objectives of these flights. Four regions lie on the great circle where the orbital plane of the moon cuts the lunar surface. They are designated as the "near", "remote", "east", and "west" points. For these points, only trajectories in the orbital plane of the moon have been considered. The other two regions, namely, the poles of the aforesaid great circle, are called the "north" and "south" points respectively. In the preliminary survey of the possible trajectories, the approximate method of assuming the earth-moon space as divided into two by a sphere of action of radius 66000 km around the moon has been employed. The trajectory may then be considered to consist of several sections, each one of which is determined by the laws of two-body problem. From considerations on the permissible angular momentum of the orbit, it has been possible to derive limiting values for the velocity of hitting and the angle of incidence in the case of impact trajectories. For reconnaissance trajectories, we try to find out the allowable perilunar distance and velocity as well as how close may the perilunar point of the trajectory be brought to the surface of the moon. From preliminary investigation by the approximate method of sphere of action, we have come to the following conclusions: A. For impact trajectories: 1) To hit either the near or the remote point, the vehicle must be approaching the moon from the east side. With velocity of impact somewhere in the range 160—180km/min, the probe may hit these points at an angle of incidence of 30° or greater. 2) Vertical impact is possible only at the east point with the velocity of hitting at slightly less than 160 km/min. 3) The west point may be hit by a lunar probe, but only at grazing incidence. 4) The trajectories for hitting the north and the south points could be mirror images of each other. These points may be hit at an angle of incidence of about 60°, at a speed of less than 160 km/min. B. For reconnaissance trajectories: 1) Over the near and the remote points, there is a whole series of symmetrical orbits in which the vehicle would be sure to return to the neighbourhood of the earth. When the perilunar velocity is about 100 km/min, the distance of close approach to the centre of the moon may be no more than 5000 km. We can make the trajectory come in contact with the surface of the moon, if we allow the perilunar velocity to be increased to 160 km/min. 2) With perilunar distance over 30000 km, it is possible for the vehicle to fly horizontally over the east point of the moon. Such reconnaissance flight is possible over the west point, but the vehicle has to be so low that the orbit becomes identical with the impact trajectory grazing the west point. 3) When the perilunar point of the orbit may be permitted to deviate about 45° from the zenith of the east or the west point, we can still have reconnaissance trajectories that will bring the vehicle back to the neighbourhood of the earth. 4) When we consider only trajectories whose motion inside the sphere of action is in a plane perpendicular to the earth-moon direction, we could have symmetrical orbits with horizontal flight over the north or the south point at a distance of about 24000 km from the centre of the moon. With permissible values at the moon for different definite points, the path of the vehicle is traced backward in time to verify if it did pass by the vicinity of the earth with reasonable speed. If so, the position and velocity of the vehicle near the earth are taken as the initial values at the last burn out point, and the impact or reconnaissance trajectory is computed once again. In such computations the attractions of both the moon and the earth are taken into account by the method of numerical integration. The trajectories thus obtained are listed in Tables 5, 6, and 7.

在月球表面上考虑了六个定点,它们是自道面内的近、远、东、西四点和此外的南北两点。为了要找到可以实现用火箭击中和航测这六点的轨道,我们以在月面定点上可以容许的初值为轨道出发点,倒推出火箭在地球附近时的位置和速度。月面定点上的初值是依据火箭大约在地面上200公里高空以第二宇宙速度发射的假定选取的。所用方法是按作用范围和简单的角动量和能量守恒的原理来考虑的。计算结果表明,火箭从地面上以通常的高度和速度发射能够击中这六个定点:东点可以垂直击中,西点只能切向击中。航测这六个定点,都可以找到有去有回的轨道,航测远、近、南、北四点还可以有对称的轨道。航测远、近点可以和月面接近到任意距离,航测其他各点,距离便要远些,约为二、三万公里。

In this paper the impact force acting on the total body's mass center was studied. The subjects were three young, healthy male parachuters. The experiments performed in the laboratory under simulated parachute jumping and landing condition were analyzed by highspeed photography and apparatus. The experimental results showed that:(1)when the subjects jumped from the platform 1.0 or 1.5m high, the vertical impact force sustained by the total body's mass center with the half-squat posture was larger than...

In this paper the impact force acting on the total body's mass center was studied. The subjects were three young, healthy male parachuters. The experiments performed in the laboratory under simulated parachute jumping and landing condition were analyzed by highspeed photography and apparatus. The experimental results showed that:(1)when the subjects jumped from the platform 1.0 or 1.5m high, the vertical impact force sustained by the total body's mass center with the half-squat posture was larger than that with the side spin posture. (2)when the subjects jumped from the platform of 1.5 m high, the total body's mass center gained a horizontal impact force risen by the half-squat posture larger than that risen by the side spin posture. When the subjects jumped from the platform of, 1.0 m high, the horizontal impact, force produced by both of the above mentioned postures seemed to be the same, which needs further investigation. (3) the side spin posture was better than the half-squat posture for reduce the landing impact force on the total body's mass center.

本文用高速摄影和仪器分析方法,研究了男性伞兵用平台训练模拟跳伞着陆时,用半蹲式和侧滚式两种姿势人体质心承受的冲击力。实验结果表明:<1>当平台高度为1.0和1.5米,用半蹲式着陆人体质心承受的冲击力大于用侧滚式姿势着陆;<2>人体质心承受的垂直冲击分力。也是半蹲式大于侧滚式;<3>当平台高度为1.5米时,半蹲式着陆使人体质心承受的水平冲击分力大于侧滚式;但平台高度为1.0米时,两种姿势产生的值均有消涨,相互交叉,有待进一步研究。因此,从减小人体质心承受的冲击力看,选用侧滚式着陆优于半蹲式。

A. proper landing posture is significant to the reduction of both the impact force acting on the human body and the injury at landing. In this paper the impact force acting on the human feet is studied. The subjects were three male parachu-ters, the experiments were performed by means of high-speed photography and a motor analyser. The experimental results are as follows. (1) When the subject jumped from two platforms 1.0m and 1.5m in height, a vertical impact force on the feet in half-squat posture was...

A. proper landing posture is significant to the reduction of both the impact force acting on the human body and the injury at landing. In this paper the impact force acting on the human feet is studied. The subjects were three male parachu-ters, the experiments were performed by means of high-speed photography and a motor analyser. The experimental results are as follows. (1) When the subject jumped from two platforms 1.0m and 1.5m in height, a vertical impact force on the feet in half-squat posture was larger than in side spin posture. (2) When the subject jumped from the platform l.0m high, the feet gained a level impact force in the half-squat posture, larger than in the side spin posture. When the subject jumped from the platform 1.5m high, ihe level impact force produced by both cf the above-mentioned postures were just the same, which needs further research. (3) In terms of reducing the impact force acting on the feet, the side spin posture is belter than the half-squat posture.

作者用高速摄影和NAC—100型运动分析仪,对3名伞兵模拟半蹲式和侧滚式姿势着陆时,足部承受的冲击力进行了研究。结果表明:①平台高1.5m和1.Om,采用半蹲式姿势着陆时,使足部承受的垂直冲击力比侧滚式姿势的冲击力大。②平台高1.0m,采用半蹲式姿势着陆时,使足部承受的水平冲击力比采用侧滚式姿势的冲击力大;平台高1.5m时,两种姿势使足部承受的水平冲击力均有消长,有待进一步研究。③从减小足部承受的着陆冲击力的观点看,侧滚式优于半蹲式。

 
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