共查询到16条相似文献,搜索用时 46 毫秒
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通过分析当前电力机车受电弓滑板存在的各种问题,用粉末冶金法研制出一种新型的受电弓滑板.该滑板由铜、碳纤维和石墨等构成.分析了成形压力、烧结温度对滑板性能的影响,对其导电性、摩擦、磨损性能及冲击韧性进行了检测,并与当前正在使用的受电弓滑板进行了对比.结果表明:该新型滑板的最佳制备工艺条件为(含量)铜78%,碳纤维2%,石墨15%,添加剂5%,成形压力为200MPa,烧结温度为880℃.该滑板不仅电阻率低,而且其摩擦、磨损及冲击韧性等性能也优越于当前正在使用的受电弓滑板.与国外浸金属碳滑板Rh82Mb相比,其摩擦系数降低20%,磨损量减少1.3%,冲击韧性提高1.7倍,导电性增强65倍. 相似文献
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6K型电力机车受电弓是法国生产的LV—2600型具有国防先进水平的受电弓型。本文简述了我国对此产品进行国产化试制的全过程。并阐明了受电弓的试制成功,不仅有重要的技术效果,而且有明显的经济效益。 相似文献
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城轨车辆的受电弓是通过与固定导线的滑动接触而受流的,在滑动过程中会与接触导线发生摩擦而产生磨耗,其磨耗程度直接影响所取电流的可靠性,也直接影响车辆的工作状态。因此,研究受电弓的磨耗具有十分重要的意义。 相似文献
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铜基受电弓滑板材料抗拉强度和冲击韧性研究 总被引:8,自引:0,他引:8
为了制备具有优良力学性能的C/Cu复合材料,采用传统的粉末冶金(PM)方法,首次将受电弓滑板中C的质量分数提高到8%(石墨粒径为295μm和495μm),分析了压制压力、保温时间和烧结温度对其抗拉强度和冲击韧性的影响,研究了石墨粒径和镀铜石墨对受电弓滑板材料性能的影响。研究结果表明:增大压制压力,可提高铜基受电弓滑板材料最终烧结件的抗拉强度;延长烧结保温时间,则降低烧结件的抗拉强度;烧结温度过高或过低对烧结件抗拉强度和冲击韧性不利;石墨粒径对铜基受电弓滑板材料性能的影响很大;石墨表面镀铜,可改善铜基受电弓滑板材料的烧结过程,提高其抗拉强度和冲击韧性,但是不改变材料的断裂机制。 相似文献
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一种新型激光多普勒振动传感器 总被引:2,自引:1,他引:2
介绍了一种采用激光多普勒技术的非接触振动传感器,分析了它的工作原理及光路电路结构,并给出了初步实验结果与测量误差分析。文中指出这种高性能价格比的振动测量仪器可望有好的应用前景。 相似文献
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This paper studies the dynamic strain measurement and delamination detection of clamped–clamped composite structures using embedded multiplexed Fibre-optic Bragg grating (FBG) sensors through experimental and theoretical approaches. A dynamic strain calibration of the FBG sensors and surface mounted strain gauges to find out the correlation between the strain and photovoltage is reported. The embedded FBG sensors were used to measure the natural frequency and dynamic strain of intact and delaminated composite structures. The strain profile of these structures subjected to external excitations was evaluated by using experimental measured data and a modified vibration theory. The results revealed that the use of the embedded FBG sensors is able to actually measure the dynamic strain and identify the existence of delamination of the structures. This allows the continuous estimation of fatigue life and minimises the need of in-site inspection of the structures. 相似文献
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研制了一套电子油门踏板性能在线快速检测装置,该检测装置可对踏板传感器输出特性和机械特性进行高精度测试.采用伺服运动全闭环控制方法,实现对踏板转动速度和踏板行程的精确控制.采用多线程数据处理方式,提高检测效率.评定结果表明,该检测装置的重复性和复现性均符合测量系统分析(MSA)的要求,满足电子油门踏板在线检测的要求. 相似文献
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提高激光光纤测量系统分辨力的方法 总被引:2,自引:0,他引:2
简要介绍了激光光纤测试系统的测量原理,详细描述了激光器功率自动控制回路和用于微小内表面形貌检测的补偿式光纤传感器结构的设计方法,并给出了初步的实验结论。实验结果表明,本文所述的提高系统分辩力的方法设计合理,有较强的实用性。 相似文献
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W. Claeys V. Quintard S. Dilhaire D. Lewis Y. Danto 《Quality and Reliability Engineering International》1994,10(4):289-295
We have recently developed an optical contactless method for testing the quality of solder joints during accelerated thermal cycling ageing processes.1 The method was based upon the measurement of the dynamic thermal behaviour of the joint to short bursts of Joule heating. It has proved to be efficient in revealing the formation of cracks at the lead-solder interface. We present a method to evaluate ageing at a much earlier stage in the cycling process. We have observed in earlier work,1 that before cracks appear, structural changes occur in the solder at the lead-solder interface. The thermal response of the solder joint is recorded over time to a Peltier heat perturbation produced by flowing a current pulse through the interface where structural changes occur. The key point in this method is to discriminate the Peltier effect from the Joule thermal response because both effects generate heat. The variation of the early Peltier response in the thermal cycling ageing tests is seen as a quantitative signature of the structural changes in the lead-solder interface. 相似文献