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通过实验获得了巴克好森噪声输出总能量、最大脉冲幅值及脉冲数与拉应力的关系. 相似文献
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巴氏噪声硬度检测方法研究 总被引:2,自引:0,他引:2
研究了一种新的硬度检测方法-巴氏噪声法,用自制的巴克豪森检测装置和洛氏硬度计对同一钢试样进行同位检测,建立了巴氏噪声综合参数γ与洛氏硬度值H的关系曲线,求出的函数关系式可作为巴氏噪声硬度检测的判定式。两种检测的检测结果很接近,绝对误差不大于1.5HRA。研究结果表明:巴氏噪声法检测钢铁材料硬主是可行的。且具有一定的检测精度。 相似文献
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通过实验获得了巴克好森噪声输出总能量、最大脉冲幅值及脉冲数与拉应力的关系。 相似文献
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The electromagnetic pump imposes the electromagnetic motive force (Lorentz force) on the liquid metal directly and makes it move along the definite direction by using the function of electric current and magnetic field in the conducting fluid. Compared with the traditional die casting, the system of counter-gravity casting can effectively control the speed of filling to make Al-alloy liquid fill steadily by adjusting controlled-current. So the foundry defects can be decreased or avoided effectively by this system. Based on the theory of electromagnetic pump, the design method of electromagnetic field in electromagnetic pump was investigated emphatically. The rule of magnetic induction intensity B influenced by the divided electromagnet airgap's size was founded. Furthermore, the empirical formula of magnetic induction intensity B in a magnetic airgap for an open magnet in the saturated state was deduced by mathematics regression analysis. Counter-gravity casting applied to the Al-alloy electromagnetic filling was developed with this method. Besides, the electromagnetism filling counter-gravity casting process of the turbo-charge blade wheel was also fixed. The eligibility rate of blade wheel produced by such technique can be increased to 98%. The casts have compact structure and excellent capability. 相似文献
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巴克豪森噪声法压应力检测中检测参数的选择 总被引:1,自引:0,他引:1
讨论了压应力检测中巴克豪森噪声检测参数的选择并给出一些参数选择的初步意见。 相似文献
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目的 研究模拟双联泵与单泵的流量大小 ,为大流量电磁泵的设计提供参考依据 .方法 通过在以水银为传输介质的模拟直流电磁泵上进行实验 ,分别测出在相同静泵高 Δp和相同出液口高度 H 下 ,双泵及单泵的流量大小 .结果 流量 Q随静泵高Δp的增大而增大 ,双泵与单泵的流量之比约为 1 .6.结论 以双联泵的方式来提高直流电磁泵的流量切实可行 相似文献