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前言我国由美国西屋电气公司(Westighouse Electric Co)引进的30万千瓦发电机组制造技术中规定:轴流式氢循环压气机动叶片由AISI_410不锈钢,采用熔模铸造,需经x-光和萤光探伤;对机械性能、冶金质量控制严格,要求叶片具有高度的运行可靠性。而国内迄今尚 相似文献
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本文在工程实践的基础上,用数理冶金方法建立了新型铸造双相不锈钢ZG1Cr13-D的强韧性方程:并给出了控制ZG1Cr13-D精铸叶片综合机械性能的数学模型,从而在理论与实践上论证了用ZG1Cr13-D代替AISI410制造汽轮机压气机动叶片之可能性。 相似文献
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1. IntroductionThe pellet injection has been proposed as a fueling means of stable fusion reactor for the future,with which the plasma density distribution in discharge can be controlled, the confinement behaviorimproved and the density limit raised. In addition,various complex phenomena produced by the pelletplajsma interactions can make the pellet injection tobe used as a plajsma diagnosis, such ajs CCD photographing, being able to provide ifs an effective wayto understand the plasma physic… 相似文献
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修正离散Chirp-Fourier变换及其在SAR 运动目标检测中的应用 总被引:3,自引:0,他引:3
离散Chirp-Fourier变换(DCFT)是最新提出的一种检测线性调频信号的有力技术,但它对信号的采样点数和信号参数有着近乎苛刻的约束条件,限制了它的工程应用.本文对DCFT的定义进行了修正,它不附带任何约束条件,是一种优越而又实用的线性调频信号检测技术.本文将其用于机载合成孔径雷达(SAR)运动目标检测当中,取得了良好的效果.此外,本文又提出了基于CLEAN思想的检测技术,与修正DCFT相结合,可以有效地检测出被强目标掩盖的弱目标,具有很大的实用价值.仿真的结果验证了算法的有效性. 相似文献
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李承跃 《特种铸造及有色合金》1982,(2)
本文运用多元线性回归系统计算机数值解,建立ZG_1Cr_(13)不锈钢精铸件机械性能数学模型,其中包括σ_b、σ_s、δ%、Ψ%和α_k五个线性方程式。各方程之通式如下: 机械性能=A_O A_1[C%] A_2[Cr% A_3[Si%] A_4[Mn%] A_5[Ni%] A_6[t] 其中[t]为回火处理时间该模型检验证明:在α≤0.01置信度时,模型线性相关显著,预测精度良好,故可供计算机质量控制系统,材料机械性能故障分析,最佳性能合金铸件计算机辅助设计等方面使用。 相似文献
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李承跃 《等离子体科学和技术》2012,(10):886-890
The statistical random sample technique has been utilized to develop a new Monte-Carlo algorithm MCHET code recently.A large amount of comparative simulation calculation work relating to the neutralized alpha-particle transport has been performed.As a result,we have found the beneficial optimizing plasma density and temperature profiles in the divertor region,with the great resulting improvement of helium ash removal efficiency by the simultaneously externally applied proper RF ponderomotive force potential energy in the vicinity of the divertor plate region.In this work the dominant atomic processes of electron impact ionization and elastic scattering by plasma ions are included.The thermal and streaming motion of the ions along the magnetic field is taken into consideration.Important conclusions are obtained that the probability of neutral helium turning back to the target plate will increase at least by 50% for the optimized combination of the beneficial density,temperature profiles and proper RF perpendicular electric field.For FEB (Fusion Experimental Breeder) reactor design parameters,the RF ponderomotive potential enhancement from 0.5 to 0.9 of ash removal efficiency can be obviously obtained.In the meantime,the tritium inventory may also be reduced to some extent. 相似文献