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Combining the experimental results and theoretical analysis, the following work has been accomplished.(1) Reasons of the decrease of interelectrode capacitance and the increase of discharge gap caused by the powder suspended in dielectric fluid are explained. And the mechanism that surface quality of workpiece improved by powder-mixed EDM is analyzed from this viewpoint.(2) The variation regularity of the percentage of silicon on the machined surface of workpiece has been summarized according to the experiment results when silicon powder was added into the working fluid. The entropy is introduced to explain the reasons for this variation regularity by thermodynamics.(3) The dimensional accuracy is greatly influenced by the overcut resulting from discharge gap and electrode wear in practice application. Empirical formulas for the overcut in EDM and powder-mixed EDM are established based on the experimental results using the ternary linear regressive method in this paper.(4) The influence of main factors on the machined surface characteristics has been evaluated based on the orthogonal experimental design method.

通过一系列普通电火花加工与混粉电火花加工的对比实验,运用工艺实验和理论分析相结合的方法,重点做了以下工作:(1)探讨了粉末颗粒导致极间电容减小、放电间隙增大的原因,并从这个角度解释了混粉电火花加工可以改善工件表面质量的机理;(2)以混合硅粉的电火花加工为例,实验得出峰值电流和脉冲宽度对加工表面层成分中硅元素含量的影响规律,并引入熵的概念从热力学的角度对硅元素含量变化的原因寻找了理论依据;(3)在实际加工中,由于粉末的加入使放电间隙变大,这使得混粉电火花加工的尺寸精度难以控制,本文利用三元线性回归的方法,在实验数据的基础上,建立了两种电火花加工过切量的计算公式;(4)将正交试验法应用于混粉电火花加工实验研究,并通过对实验指标极差的直观分析,得出各电参数对加工指标影响的敏感程度。

The influence of rhizosphere medicine in different components and application methods on the survival rate, height, DBH, relative turgidity of bark, morbidity, contagious index and tree capacitance of Populus hopeiensis were studied.

研究了不同成分配比的根际微生态保健剂在拌土和蘸根两种施用方式下,对河北杨造林成活率、树高、胸径、树皮相对膨胀度、烂皮病发病率、感病指数以及树体电容的影响。

When the change in the component of the tested material measured the uniplanar scattering-field capacitive sensor causes the variation of the total dielectric constant ε_x, the measured capacitance C_X will also change.

当同面散射场电容传感器的测量介质的组成成分变化时,会引起总介电常数ε_x的变化,从而,测量电容C_x也随之变化。

推荐网络例句

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面,更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值,分为几个相等的区间作为横轴,并将各区间内所测定值依所出现的次数累积而成的面积,用柱子排起来的图形,也叫做柱状图。

You rap, you know we are not so good at rapping, huh?

你唱吧,你也知道我们并不那么擅长说唱,对吧?