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     The calculation formulae and equilibrium characteristics of inertia force and torque for vertical three-row piston compressor are analysed and educed, Which are of the angle between whose two adjoining crank is 120 degree.
     详尽地分析和推证了立式三列、曲拐错角δ =1 2 0°的活塞式压缩机惯性力及力矩的计算公式和平衡特性
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     The article has analyzed and deduced the calculation formulae and equilibrium characteristics of inertia force and torque for horizontal three-row opposite reciprocating piston compressor in details,the angle between every two adjoining cranks is 120 degree.
     分析和推证了卧式对置三列、曲拐错角δ=120°的往复活塞压缩机的惯性力及力矩的计算公式和平衡特性。
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     The space location of crankshaft influences the strength of crankshaft and the stability of emulsion pump.
     曲柄错角直接影响曲轴的强度和泵的工作稳定性。
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  相似匹配句对
     angle.
    
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     A New Type of Angle Acceleration Sensor
     加速度传感器
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     STRESS ANALYSIS ON ANGULAR DISTORTION AND MISALIGNMENT OF SPHERICAL TANK
     球罐变形边的应力分析
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     INTELLEGENT FAULT TOLERANCE CONTROLLER FOR SERVO MOTOR OF PLATFORM IN AN INERTIAL NAVIGATION SYSTEM
     速率平台伺服机构的智能控制与容研究
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     NOT WRONG
     单身不是
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This is one of a series of reports on study of tandem-propeller performance. The report describes the influence of some important parameters of the tandempro-peller on their performance, such parameters including axial spacing ratio, angular spacing, diameter difference between fore and after propellers, pitch distribution of fore and after propellers and its pitch match each other, blade outline and shape of blade sections, etc.The performance charts of two sets of tandem-propeller CLB 4-40-2 and CLB4-55-2...

This is one of a series of reports on study of tandem-propeller performance. The report describes the influence of some important parameters of the tandempro-peller on their performance, such parameters including axial spacing ratio, angular spacing, diameter difference between fore and after propellers, pitch distribution of fore and after propellers and its pitch match each other, blade outline and shape of blade sections, etc.The performance charts of two sets of tandem-propeller CLB 4-40-2 and CLB4-55-2 are given. And further, the block diagram for design tandem-propeller with charts using digital computer is given. According to the test results, the comparison of the tandem-propeller with the single conventional B-series propeller of nearly the same disc ratio has shown that, under the condition of optimum diameter themselves and Bp≥4, the efficiency of tandempropeller is a little higher than the conventional propeller and the optimum diameter may be decreased by morethan 4%, however, under the condition of restricted diameter and Bp≥4, the efficiency of tandem-propeller is higher than conventional one and its increment of efficiency is increased when the Taylor's power coefficient Bp increased or Taylor' s speed coefficient 6 decreased.

本文是作者关于串列螺旋桨方面的研究报告之一,它探讨了串列浆的重要参数(包括桨距比、叶错角以及前后桨的直径、螺距分布和配合、叶型和叶轮廓等)对其性能的影响,发表了两组串列螺旋桨系列试验图谱CLB4-40-2和CLB4-55-2,并给出了用图谱方法设计串列螺旋桨的框图。 对于直径不受限制的情况:在(1/2)B_p≥4时,串列桨的效率比相近盘面比的普通桨略高,最佳直径减少4%以上;对于直径受限制的情况:在(1/2)B_p≥4时,串列桨效率皆较相近盘面比的普通单桨为高,其效率增加量随功率系数(2/1)B_p的增大或直径系数δ的减小而增加。

Based on the quasi-steady theory of conventional propeller and the knowledge concerning cavitation and excited forces, this paper presents a calculating method for the cavitation and the excited forces of tandem propeller operating in a non-uniform flow field. The contents are the traeatment of a circumferential non-uniform flow field by Sasajima's weighted average method, hydrodynamic charactcristicscalculation in which the effects of shipstream contraction of fore propeller is considered, the harmonic analysis...

Based on the quasi-steady theory of conventional propeller and the knowledge concerning cavitation and excited forces, this paper presents a calculating method for the cavitation and the excited forces of tandem propeller operating in a non-uniform flow field. The contents are the traeatment of a circumferential non-uniform flow field by Sasajima's weighted average method, hydrodynamic charactcristicscalculation in which the effects of shipstream contraction of fore propeller is considered, the harmonic analysis of bearing forces and surface forces, the calculation of the thrust eccentricity of a pair of fore and after propeller blades, the harmonic analysis calculation of thrust and torque fluctuation, the calculation of the cavity length and area on the blades offore and after propellers, the calculation of pressure fluctuation at a point in space.

本文基于普通螺旋桨的准定常理论和有关空泡、激振力的理论,发展了不均匀流场中串列螺旋桨空泡、激振力的一个计算方法。主要内容包括:Sasajima加权平均对周向不均匀流场的处理;计及前桨尾流收缩影响的串列螺旋桨正问题计算;轴承力和表面力的谐调分析;前、后桨一对叶片推力偏心的计算和推力、扭矩脉动的谐调分析计算;前、后桨叶剖面空泡长度和面积计算;前、后桨对空间一场点脉动压力的计算。本文还计算了同一伴流场中负荷相同,但叶错角和前、后桨螺距匹配情况不同的串列螺旋桨空泡长度。结果表明:不同的叶错角和不同的螺距匹配对串列旋桨的空泡长度有明显的影响。本方法对不均匀流场中串列螺旋桨的设计以减少激振力有一定的实际意义。

It is important for earth science community at home and abroad to look for the northern boundary of Gondwana facies of Permo-Carboniferous system in Qing-Xizang Plateau.Through large scale of geological research a west cast direced ophiolite zone, a high pressure metamorphic zone and a Gondwana facies of Permo-Carboniferous system were discovered with the Gondwana facies of Permo-Carboniferous system controlled by the ophiolite zone and the high pressure metamorphic zone.lt follows that the suture between Longmucuo...

It is important for earth science community at home and abroad to look for the northern boundary of Gondwana facies of Permo-Carboniferous system in Qing-Xizang Plateau.Through large scale of geological research a west cast direced ophiolite zone, a high pressure metamorphic zone and a Gondwana facies of Permo-Carboniferous system were discovered with the Gondwana facies of Permo-Carboniferous system controlled by the ophiolite zone and the high pressure metamorphic zone.lt follows that the suture between Longmucuo and Shuanghu plates was primarily extending southeastward to connect with the Lancangjiang suture west of Yunnan Province,to Malaysia and then the boundary between Gondwana facies and Tethys facies of Permo-Carboniferous systems has been fairly established.Data show that there had been a supercontinent during Tournaisian stage in early Carboniferous and the rifting of which started from late Visean or Namur-ian stage. Sedmentation and volcanism of late Carboniferous epoch found in the region south of Qiangtang and Phuket Group found in Malaysia might be products of the Visean stage. The Metamorphic age of blueschist from Lancangjiang west of Yunnan province is 2.4 or 2.6Ma,the high pressure mineral assemblageonly appears in basic rocks of late Carboniferous to early Permian in the middle of Qiangtang plateau where the biota had been changed completely to warm-water fauna since late stage of early Permian,are all facts indicating the age for the rifted continents to reunite ought to be early Permian.Other evidence is:1) The Longmucuo-Shuanghu-Lancangjiang suture was formed in Permian;2) This suture clearly controls the distribution of Gondwana-Tethys facies. So that the Longmucuo-Shuanghu-Lancangjiang suture is considered as the boundary between Gondwana and Kurasia.

1982—1983年间,作者在改则幅和日土幅1:100万区域地质调查中,发现在黑头山—冈玛错—角木日—双湖一带,存在严重解体的蛇绿岩带。后经进一步工作,获悉该带明显地控制了冈瓦纳相和特提斯相石炭、二叠系的分布,并有高压变质带的岩石出露。因此,该带为一条北西西—南东东向的板块缝合带,它应是目前国内外地质界都在寻找的冈瓦纳大陆的北界。

 
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