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综合材料强度等因素的轴向电磁轴承最大承载力与转速关系分析
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作者 赵宇兰 刘兴男 +2 位作者 杨国军 时振刚 赵雷 《风机技术》 2020年第2期53-58,共6页
高温气冷堆商业示范电站(HTR-PM)主氦风机转子重4吨、运行功率4.5MW,立式运行于氦气环境中,选用全电磁轴承支承。其中,轴向轴承设计要求能够承受转子重力4吨及同向叠加的气动载荷8吨。轴向电磁轴承电磁力与磁极(包括止推盘)面积成正比,... 高温气冷堆商业示范电站(HTR-PM)主氦风机转子重4吨、运行功率4.5MW,立式运行于氦气环境中,选用全电磁轴承支承。其中,轴向轴承设计要求能够承受转子重力4吨及同向叠加的气动载荷8吨。轴向电磁轴承电磁力与磁极(包括止推盘)面积成正比,取决于止推盘所允许的最大外径。但当考虑转速时,最大外径还受材料强度限制而不能任意选取。因此,在材料强度、最大外径(最大电磁力)与最高转速之间存在一定的函数关系,若综合考虑损耗及允许温升等因素,各个参量的关系相对更为复杂。本文根据第一强度理论,确定了转子极限转速与不同结构形式的止推盘最大外径的解析关系;进一步,通过电磁仿真分析验证了不同转速、不同材料对应的最大电磁力。并在上述分析计算基础上,基于专用1:1实验装置,对比推力盘所受电磁力随电流而变化的情况。研究结果有助于HTR-PM高温气冷核反应堆主氦风机轴向电磁轴承的选型设计。 展开更多
关键词 电磁轴承 推力盘 电磁承载力 材料强度 高温气冷堆
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电磁轴承水平转子跌落恢复控制策略研究
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作者 赵宇兰 宫海龙 +3 位作者 杨国军 时振刚 陈润年 赵雷 《风机技术》 2020年第3期38-45,共8页
为避免电磁轴承失效、过载等事故发生,在转子/电磁轴承系统中安装辅助轴承,为转子提供临时机械辅助支承,并可对转子起到限位的作用。本文建立动态模型对转子跌落动态特性进行研究。该模型可预测转子各自由度的位移及转动,并在考虑转子... 为避免电磁轴承失效、过载等事故发生,在转子/电磁轴承系统中安装辅助轴承,为转子提供临时机械辅助支承,并可对转子起到限位的作用。本文建立动态模型对转子跌落动态特性进行研究。该模型可预测转子各自由度的位移及转动,并在考虑转子具有跌落碰撞可能的情况下,设计PID控制策略进行位置恢复控制。该控制策略可在转子受外界剧烈扰动而具有跌落趋势甚至已经发生碰撞的情况下,有效将转子恢复至无接触悬浮状态并避免碰撞进一步恶化的发生。 展开更多
关键词 主动电磁轴承 辅助轴承 转子跌落 动态特性分析 位置恢复控制 水平转子
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Efficacy and safety of Shexiang Baoxin pill(MUSKARDIA)in patients with stable coronary artery disease:a multicenter,double-blind,placebo-controlled phase IV randomized clinical trial 被引量:23
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作者 Jun-Bo Ge Wei-Hu Fan +13 位作者 Jing-Min Zhou Hai-Ming Shi Fu-Sui Ji Yang Wu yu-lan zhao Jun Qian Yuan-Zhe Jin Ying-Wu Liu Sheng-Huang Wang Sheng-Hu He Ping Yang Jie Wu Feng Lu Zi-Shan Hou 《Chinese Medical Journal》 SCIE CAS CSCD 2021年第2期185-192,共8页
Background:The Shexiang Baoxin Pill(MUSKARDIA)has been used for treating coronary artery disease(CAD)and angina for more than 30 years in China.Nevertheless,methodologically sound trials on the use of MUSKARDIA in CAD... Background:The Shexiang Baoxin Pill(MUSKARDIA)has been used for treating coronary artery disease(CAD)and angina for more than 30 years in China.Nevertheless,methodologically sound trials on the use of MUSKARDIA in CAD patients are scarce.The aim of the study is to determine the effects of MUSKARDIA as an add-on to optimal medical therapy(OMT)in patients with stable CAD.Methods:A total of 2674 participants with stable CAD from 97 hospitals in China were randomized 1:1 to a MUSKARDIA or placebo group for 24 months.Both groups received OMT according to local tertiary hospital protocols.The primary outcome was the occurrence of a major adverse cardiovascular event(MACE),defined as a composite of cardiovascular death,non-fatal myocardial infarction(MI),or non-fatal stroke.Secondary outcomes included all-cause mortality,non-fatal MI,non-fatal stroke,hospitalization for unstable angina or heart failure,peripheral revascularization,angina stability and angina frequency.Results:In all,99.7%of the patients were treated with aspirin and 93.0%with statin.After 2 years of treatment,the occurrence of MACEs was reduced by 26.9%in the MUSKARDIA group(MUSKARDIA:1.9%vs.placebo:2.6%;odds ratio=0.80;95%confidence interval:0.45-1.07;P=0.2869).Angina frequency was significantly reduced in the MUSKARDIA group at 18 months(P=0.0362).Other secondary endpoints were similar between the two groups.The rates of adverse events were also similar between the two groups(MUSKARDIA:17.7%vs.placebo:17.4%,P=0.8785).Conclusions:As an add-on to OMT,MUSKARDIA is safe and significantly reduces angina frequency in patients with stable CAD.Moreover,the use of MUSKARDIA is associated with a trend toward reduced MACEs in patients with stable CAD.The results suggest that MUSKARDIA can be used to manage patients with CAD.Trial registration:chictr.org.cn,No.ChiCTR-TRC-12003513. 展开更多
关键词 MUSKARDIA Stable coronary artery disease ANGINA Major adverse cardiovascular event
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