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The problem of the ejection of a flat piston from a halfspace occupied by a uniform magnetic field parallel to the piston and a gas with an electrical conductivity of σ dependent on the temperature T, in which σ=0 when T>amp;lt;T*, is considered.


Computation of the base pressure in ejector nozzles of different length with zero coefficient of ejection


In this case it is possible to consider the ejection of a free body which does not come into contact with the walls of the launching tube as it is accelerated.


The results obtained are used in the problem of ejection of a free body from a launching tube under the effect of an unsteady gas flow.


On the basis of [1] an improved method was developed which, within the framework of the model of an ideal gas, allows one to calculate the flow in ejector nozzles without a limit on the coefficient of ejection.

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 A brief history and development for ejection seat is introduced. Emphasis is put on the options of improvement upon safe escape in low level and high speed mode. For providing the ejection seat with a self adaptive control, some equipments, including microcomputer, new sensors and controllable rocket motors should be used. Finally, three escape schemes for high acceleration cockpit are presented and evaluated.  本文回顾了弹射座椅的发展历程。重点讨论了改善弹射座椅低空救生和大速度救生的方案,指出了今后将采用的新技术,包括微处理机、各种传感器和可调节的动力装置,以满足座椅自适应控制的要求。最后分析了提到议事日程上的高过载座舱的三种拟议方案。  In this paper electric circuit model was developed for experimental approach to study the human endurance to ejection. The human body is considered as an elastic body of single degree of freedom with low damping ratio. Its mechanical motion after the action of ejection force is similar to the current motion in the circuit of an electric oscillator. Their motion can be expressed by the same differential equation. When their natural frequency and damping ratio are the same, the electric oscillatory circuit can... In this paper electric circuit model was developed for experimental approach to study the human endurance to ejection. The human body is considered as an elastic body of single degree of freedom with low damping ratio. Its mechanical motion after the action of ejection force is similar to the current motion in the circuit of an electric oscillator. Their motion can be expressed by the same differential equation. When their natural frequency and damping ratio are the same, the electric oscillatory circuit can be used for experiments instead of human body. Natural frequency of 10.5Hz and damping ratio of 0.3 were selected for the electric model. Having transfered square waves, sine waves, triangle waves, trapezoid waves, discrete waves and overlapping waves into the electric circuit model, the output wave can be obtained. According to the amplitude of the wave, we can get the ratio value of input to output waves. If we know the amplitude of input wave, we can calculate the amplitude of the output wave from the ratio. The value of amplitude of output wave represents the magnitude of ejection overload acting on the human body. If we know the endurance capability to compressive stress of the vertebral bone, we can predicate the human endurance to ejection overload. According to this principle we have plotted the curve of human endurance vs. ejection overload.  本工作采用电子振荡线路模型对人体弹射过载耐力进行研究。人体是弹性体,他受到弹射力作用后的运动规律与电子振荡线路的电流运动相似,都可用相同的微分方程表达,只要它们的固有频率和阻尼比相同,电子模型即可代替人体进行实验。电子模型主要参数为带宽0～100多Hz,主固有频率10.5Hz,阻尼比0.3。将模拟的弹射信号输入到模型中去,即可得输出信号,它的波幅即代表作用在人体上的过载值,然后根据人体脊椎骨耐压强度,即可获得输入波形与耐力之间的关系。通过一系列实验,求得输入不同波形时人体的耐力数据和耐力曲线。  The purpose of this study was to investigate the transfer function of ejection power of pilot escape system. The simulation tests were conducted by using linear mechanical vibration system and the data measured were processed by the method of wave and frequency spectrum analysis of digita signal. A preliminary analysis of the processed test data is briefly described in this paper. It shows that processed results of test data are in compliance with the feature of ejection power performance and dummy model. The... The purpose of this study was to investigate the transfer function of ejection power of pilot escape system. The simulation tests were conducted by using linear mechanical vibration system and the data measured were processed by the method of wave and frequency spectrum analysis of digita signal. A preliminary analysis of the processed test data is briefly described in this paper. It shows that processed results of test data are in compliance with the feature of ejection power performance and dummy model. The computational equations and method selected are reasonable and practicable.  研究飞行员弹射救生系统弹射动力的传递作用,采用线性机械振动系统进行模拟试验,利用数字信号的波形与频谱分析方法进行数据处理。试验结果表明:符合弹射动力与人体模型的特点。计算公式和方法是合理可行的。   << 更多相关文摘 
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