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刚体定点转动的转动轴──关于刚体定点运动的有限转角是否矢量之我见 被引量:1
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作者 石晓斌 《云梦学刊》 1997年第4期63-66,共4页
指出在刚体定点运动中,围绕空间中的固定系的固定轴转动次序的不可交换性、或绕本体系的因连轴转动攻序的不可交换性来说明定点运动中的有限转角不是矢量是不妥的;阐明刚体定点运动的三种分转动的转轴,既不全是空间中的固定轴,也不... 指出在刚体定点运动中,围绕空间中的固定系的固定轴转动次序的不可交换性、或绕本体系的因连轴转动攻序的不可交换性来说明定点运动中的有限转角不是矢量是不妥的;阐明刚体定点运动的三种分转动的转轴,既不全是空间中的固定轴,也不全是本体系的固连轴。例证定点运动的三种有限转角的转动次序的可交换性,得到实际存在的定点运动的有限转角是矢量是轴矢量的结论。 展开更多
关键词 有限转角 刚体定点运 刚体定点转 矢量加法 自转 交换律 理论力学 进动轴
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Experimental study on a magnetofluid sealing liquid for propeller shaft
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作者 ZHAO Chang-fa, SUN Rong-hua, ZHENG Jin-xing School of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China 《Journal of Marine Science and Application》 2003年第1期66-70,共5页
The selecting and preparing method of the basic material of magnetic fluid was introduced. By using a chemical method, the magnetic micropowder Fe 3O 4 was successfully yielded, and an oil-base as a working carrier an... The selecting and preparing method of the basic material of magnetic fluid was introduced. By using a chemical method, the magnetic micropowder Fe 3O 4 was successfully yielded, and an oil-base as a working carrier and dispers ing agent was determined. The preparation process of the magnetic fluid and prescription of the oil-base magnetic fluid were discussed. The simulation experimental rig of magnetic fluid sealing for propeller shaft was designed. The sealing ability experiment was conducted and results were analyzed. The pressure of sealing is up to 2 MPa. 展开更多
关键词 magnetic fluid sealing ability propeller shaft
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