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本文主要介绍了液压挖掘机履带式行走机构的结构组成和工作原理,同时分析了挖掘机履带在使用过程中损坏的原因及如何延长其使用寿命。 相似文献
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NASA is seeking to damp a firestorm over its decision to stop astronaut servicing of the Hubble Space Telescope by lin-ing up ideas for robots that could do the job. Dozens of teams from industry bodies and academic institu-tions have responded to an agency request for schemes to use a robotic spacecraft to replace the telescope's batteries and gy-roscopes and install two new science instruments. These were traditionally jobs for astronauts. But NASA sci-ence chief Ed Weiler told th… 相似文献
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随机激励下高压管道的疲劳寿命分析 总被引:3,自引:0,他引:3
应用功率谱密度(Power Spectral Density)法对随机基础激励下高压管道进行疲劳寿命分析.给出了在随机激励作用下结构的随机响应计算方法,由随机过程和Miner线性累积损伤理论,推导了功率谱密度法估算结构寿命的公式.在此基础之上,以一飞机高压管道结构为例,编写程序求解出其疲劳寿命值.算例表明,在某些结构的应力响应无法实测或难以实测到的情况下,采用功率谱密度法分析其疲劳寿命显得简洁有效. 相似文献
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Reichhardt T 《Nature》2000,404(6777):423