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近似模型
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  approximate model
    In the equation,different approximate model is used to describe the local Rayleigh or resonant response of each scattering center.
    在这种方程中,每个散射中心的局部瑞利或谐振响应曲线用各种不同的近似模型去逼近;
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    Thermodynamic and electromechanical(electrothermal)properties of various solid armature materials have been analyzed and calculated by the electric-contact theoretical model. The theoretical re- sults show the electrothermal properties of Cu armature are better than that of Al armature.
    采用电接触理论的近似模型具体对轨道炮中由两种不同材料铜和铝组成的 U 型电枢的电热物理特性进行了分析与计算,结果表明:铜电枢的电热特性要优于铝电枢,电枢转捩烧蚀是由于电枢表面的摩擦热和焦耳热的积累作用以致熔和气化,最后失接触而形成的。
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  approximate model
On the basis of an approximate model of filtration with drainage washings of a soil layer with a water-impermeable base [1], shown schematically in Fig.
      
In [1], the present author investigated an approximate model of two-dimensional flow in the case of leaching of soil in the presence of an impermeable layer when the depression curve is replaced by a fixed horizontal boundary.
      
An approximate model of the flow is constructed and an analytic solution is obtained for the location of the boundary of the multicycle jet.
      
A brief description is given of the approximate model for the calculation of temperature fields, which simplifies the processing of experimental data
      
Theoretical models of heat transfer by radiation through a vapor gap under conditions of film boiling of liquid are treated, namely, a general wave model for a gap of arbitrary thickness and an approximate model of geometrical optics.
      
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In this paper,the step frequency response equation of optical-region radar target is firstly established by using theories of multiple scattering centers and local resonance. In the equation,different approximate model is used to describe the local Rayleigh or resonant response of each scattering center. Then a novel method of target structure imaging based on band-limited response data for target spacial features extraction is presented. The obtained quasi-two-dimensional image provides target features of not...

In this paper,the step frequency response equation of optical-region radar target is firstly established by using theories of multiple scattering centers and local resonance. In the equation,different approximate model is used to describe the local Rayleigh or resonant response of each scattering center. Then a novel method of target structure imaging based on band-limited response data for target spacial features extraction is presented. The obtained quasi-two-dimensional image provides target features of not only range response under wide-band waveform stimulation,such as one-dimensional range profile,but geometrical structure category of each local scattering center also. The features can be used for radar target identification.

本文首先根据多散射中心理论与局部谐振原理,建立了雷达目标在光学区阶梯频率波形激励下的响应方程。在这种方程中,每个散射中心的局部瑞利或谐振响应曲线用各种不同的近似模型去逼近;然后导出了从目标的限带响应数据中抽取目标空间特征的结构成像方法,所得到的目标准二维图像既揭示了目标在宽带波形激励下的距离响应特征(即一维距离像),又反映了目标各局部散射中心的几何类型特征,可用于雷达目标的识别。

Thermodynamic and electromechanical(electrothermal)properties of various solid armature materials have been analyzed and calculated by the electric-contact theoretical model.The theoretical re- sults show the electrothermal properties of Cu armature are better than that of Al armature.The arma- ture converting erosion is influenced by bad electric-contact coming from fusing and vaporization,which is caused by accumulating effect of friction heat and Joule heat.The experimental results agreed with theoretical...

Thermodynamic and electromechanical(electrothermal)properties of various solid armature materials have been analyzed and calculated by the electric-contact theoretical model.The theoretical re- sults show the electrothermal properties of Cu armature are better than that of Al armature.The arma- ture converting erosion is influenced by bad electric-contact coming from fusing and vaporization,which is caused by accumulating effect of friction heat and Joule heat.The experimental results agreed with theoretical results.

采用电接触理论的近似模型具体对轨道炮中由两种不同材料铜和铝组成的 U 型电枢的电热物理特性进行了分析与计算,结果表明:铜电枢的电热特性要优于铝电枢,电枢转捩烧蚀是由于电枢表面的摩擦热和焦耳热的积累作用以致熔和气化,最后失接触而形成的。所得结果与实验结果一致。

Based on the assumption that the plasma in bore is a fully developed jet flow, the jet integeral approximation model for plasma ignition process is proposed. In the following combustion process, plasma flow is treated by introducing plasma mixing length in the form of empirical relations. Appropriate interphase drag and heat transfer formulation are also suggested. An adapted grid method has been incorporated to the above model to improve numerical calculation accuracy. Calculated pressure curves reproduce the...

Based on the assumption that the plasma in bore is a fully developed jet flow, the jet integeral approximation model for plasma ignition process is proposed. In the following combustion process, plasma flow is treated by introducing plasma mixing length in the form of empirical relations. Appropriate interphase drag and heat transfer formulation are also suggested. An adapted grid method has been incorporated to the above model to improve numerical calculation accuracy. Calculated pressure curves reproduce the experimental results well. Compare with the conventional interior ballistic situation, the velocity and pressure of gas, Solid phase at different time and temperature at bore bottom are increased. It shows the enhancement of interior ballistics by plasma injection. Calculated results provide a theoretical basis for the ballistic design of solid propellant electrothermal chemical(ETC) gun.

在初始点火过程中 ,假设等离子体为充分发展射流流动 ,因而可采用积分近似模型进行描述。而在随后的膛内燃烧过程中通过以经验公式给出等离子体混合长度的方法来处理等离子体的运动 ,并给出了合适的相间阻力及传热公式。通过在计算网格设计中引入了自适应方法提高了数值解精度。计算膛压曲线与实验符合良好。相对常规内弹道情形 ,等离子体能量的注入使在不同时刻膛内的气、固两相速度、压力和膛底温度等出现提高 ,这是等离子体注入后对内弹道的增强过程。计算结果为固体工质电热化学炮的弹道设计提供了理论依据。

 
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