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孤网运行是电站运行中的特例,其运行工况和方式都与大电网运行有诸多不同之处,孤网运行系统中对电网频率进行控制的机组调速器更显得尤为重要。本文针对非洲加蓬大布巴哈电站孤网运行中存在的实际问题及调速器系统调试进行分析所取得的结论,可供同行相关人员参考。 相似文献
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对烃烃分馏塔进行模拟计算,结果表明尽管原料处理量,组成及分离要求发生发显著变化,但经塔盘梢加堵孔改造后,通过大幅度降低幅操作压力,仍能进行塔的平衡操作,并得到符合要求的新产品。 相似文献
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元素掺杂是改善金属钒的氢溶解度高、易氢脆的有效手段。本文研究了(Pd,Mo)掺杂对钒基固溶体结构和氢渗透性能的影响。结果表明:电弧熔炼制备的V100-xPdx和V100-xPdx/2Mox/2 (x=3.125,6.25)合金均为具有V-BCC相结构的钒基固溶体,与金属钒相比,(Pd,Mo)掺杂的固溶体有明显的晶格膨胀现象,双掺V93.75Pd3.125Mo3.125固溶体具有最大的晶格膨胀率(0.251%)。掺杂降低了金属钒的氢溶解度,增大了氢化物形成焓,有利于改善金属钒的抗氢脆性能。双掺V100-xPdx/2Mox/2(x=6.25)合金表现出良好的氢渗透综合性能。V93.75Pd3.125Mo3.125合金具有较高的氢扩散系数(6.37×10-10 cm<... 相似文献
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In order to obtain enhanced plasma parameters a complete new tokamak HL-2M is now under construction in Southwestern Institute of Physics. To assure the structural safety of the device for the entire operation cycle, one of the most important issues is the lifetime-limiting effects due to the pulsed operation mode. Fatigue is one of the major failure modes to be considered in mechanical design, and pulsed operation imposes stress with significant alternating components on the support structure (SS). Therefore, the reliability of the whole device is strongly affected by the stress and fatigue characteristic of the SS as the interface structure. This article introduces the SS design and details the fatigue life calculation methods based on the different characteristics of the sub-structures. The fatigue life in hazardous areas of the toroidal field coils anti-torque structure (TFCs-ATs) has been determined by non-linear analysis results. And with the stress- time history data of the vacuum vessel & poloidal field coils support structure (VV&PFCs SS), the fatigue analysis of the hot spots has been completed based on rain-flow counting method and linear cumulative damage method. The calculated minimum fatigue life on TFCs-ATs and VVSzPFCs SS is 4.743E+05 and 1.805E+06 cycles, respectively. And the calculated fatigue life on sub-structures can meet the required life for HL-2M tokamak: 1.0E+05 cycles. 相似文献
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曲梁三角形柔性铰链力学建模与分析 总被引:1,自引:0,他引:1
直簧片柔性铰链研究结果表明,簧片的约束行为对柔性铰链的刚度和精度特性具有本质影响,而具有放松约束行为的弯曲簧片一直缺乏系统研究,其非功能方向的约束特性具有重要研究价值.尤其对于曲梁三角形柔性铰链,建立直观的力学模型,对于放松约束行为的曲梁柔性铰链拓扑研究具有重要意义.基于Awtar曲梁模型公式,在普遍受力状态下,建立基于曲梁的三角形柔性铰链转角数学模型,并推导出轴漂数学模型,理论分析与有限元分析结果精确吻合,说明数学模型的正确性,同时,计算结果表明,曲梁柔性铰链约束行为具有较多变化,为新型柔性铰链的设计提供了新的思路. 相似文献