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A problem of optimization of cutting parameters with respect to the criteria of maximum efficiency and maximum tool resistance
is formulated. To solve the problem, a method is developed and applied for determining the Pareto-optimal values of machining
conditions in milling the present-day GTE monoimpeller blade passages with a circular milling cutter. 相似文献
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燃油油量的测量,方法很多。本文首先论述了浮子电位器式传感器与电阻电桥相匹配的测量原理以及计算方法, 相似文献
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We experimentally confirmed the effect when the wave resistance of rough-wall plane channels, generated while the walls are
streamlined by a supersonic gas flow, reaches the extreme values. The experiments were conducted on a differential setup by
comparing the tests of flat and round sonic nozzles. The results of the experiment justified the developed method of calculating
the wave resistance of the plane channel with sawtooth wall relief. 相似文献
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A. V. Kretinin Yu. A. Bulygin V. Yu. Klimov P. A. Dronov 《Russian Aeronautics (Iz VUZ)》2009,52(4):440-443
The results of calculating the fuel component distribution along the cooling path channels in the liquid rocket engine (LRE)
based on the Monte-Carlo method with regard for a random scatter of the hydraulic resistance coefficient values in the individual
channels are presented. 相似文献
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E. N. Bogomolov S. M. Piotukh I. A. Simonov V. A. Uglov 《Russian Aeronautics (Iz VUZ)》2010,53(4):416-420
A method for calculating the flowrate of the gas flowing through the cellular insert cells over the labyrinth seal strip is
proposed. The gas density is taken to be average with respect to the decisive section. It is assumed that jets flowing out
of cells disrupt the direct flow of the labyrinth seal. A practical implementation of the method is confirmed by the known
experimental data. 相似文献
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可倾瓦推力轴承的最佳支承位置决定了该轴承具有最佳的性能。为了准确确定平面扇形可倾瓦推力轴承的最佳支点位置,本文分析了离心力效应,提出了何时考虑离心力效应的判据和出现空穴现象的判据,较系统地给出了处于最佳支点位置的平面扇形可倾瓦推力轴承的性能计算线图。 相似文献
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无独立线路标准化电位差计按单个电阻进行元件检定不方便、时间长、过程复杂。采用j+1盘的10/Σ1Ui^j+1示值检定j盘每个步进值的电压比较法,可缩短时间,方便易行。提高了检定精度,并推导出系列计算公式和应用实例。 相似文献
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基于自适应提升小波收缩阈值图像去噪算法 总被引:1,自引:0,他引:1
提出了一种自适应提升小波收缩阈值去噪方法,改进了提升算法中预测算子的计算方法,在更新算子中引入了自适应,最后在阈值处理方面使用了实践证明效果比较好的收缩阂值,仿真证明,经去噪后,图像在性能指标上有一定的提高,图像的细节能够很好地保持。 相似文献
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在分析雷电电磁脉冲、核电磁脉冲等电磁脉冲(EMP)对地面电子设备可能造成的损害,以及电磁脉冲感应电流在接地体中的散流特性的基础上,给出了简单接地体的冲击接地作用的度量参数和冲击接地电阻的计算方法,并举例求得一个接地体的冲击接地电阻,为实际工程提供理论依据。 相似文献
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本文通过具体算便分析了C_(n β.d y x)迎角稳定性判据的可靠性,对使用这一判据可能造成失误的原因作了归纳,得出了一些便于使用这一判据的结论。 相似文献
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The effects of aliasing (including pseudoaliasing), picket-fence effect, and leakage in the fast Fourier transform (FFT) are presented. A computer program was written to perform the FFT analysis of known inputs. The program has the capability of detecting aliasing by calculating an "aliasing coefficient" (Q), and will increase the sampling frequency and the number of points in the input sequence if aliasing occurs. The term "pseudoaliasing" is a phenomenon which is similar to aliasing (or fold-over) but related to the effects of picket fence and leakage. The "leakage coefficient" (ri) is a quantitative measure of the deviation from the fundamental frequency component with respect to the sampling frequency, when the input sequence has only one frequency component. 相似文献
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An analysis of the relationship between a linear amplifier chain and an analog-to-digital converter (ADC) in a digital microwave receiver, with respect to sensitivity and dynamic range issues, is presented. The effects of gain, third-order intermodulation products and ADC characteristics on the performance of the receiver are illustrated and design criteria for the linear amplifier chain (given a specified ADC) are developed. A computer program is included which calculates theoretical receiver performance based on gain and third-order intermodulation product selections. Experimental results are also presented and compared with theoretical values 相似文献
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一、疲劳强度计算方法的建立 定向凝固镍基高温合金 DZ2 2是一种正交各向异性材料 ,对于各向异性材料 ,由于偏轴向拉剪和剪拉耦合的存在 ,形状改变与体积变化无法分开 ,仅考虑剪切应变能不足以说明各向异性材料的失效 ,还需要考虑体积改变能。据此认为 Tsia- Wu理论 [1 ] 较 Hill理论 [2 ] 更能有效地反应各向异性材料的失效 ,并根据 Tsai- Wu理论导出一个疲劳强度的计算方法。Tsai- Wu假设各向异性材料在应力空间中的破坏表面可表示为一个高阶张量多项式 ,并提出了以二阶张量多项式为破坏准则的计算方法 ,即Fijσiσj+ Fiσi =1 ( … 相似文献