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hammer
相关语句
  锤击
    through comprehensive anslysis of many models incouding integral,monomer,space,plane. dynamic & static etc. ,the structural scheme for high-piled slab & beam wharf with the slope of 5∶1 (of sloping pile )at larger water level ampkitude area of China and the feasibility of piling with hammer under solid soil conditions are put forward.
    在设计中,从整体、单体、空间、平面、动力、静力多种模型结合分析,提出了目前国内较大水位差地区斜桩斜度5∶1的高桩梁板式码头结构方案和在坚硬土层条件下的锤击沉桩可行性等工程措施,突破了常规设计的局限
短句来源
  “hammer”译为未确定词的双语例句
    Programming and Analysis concerning Combined Water Hammer and Surge Tank Calculations
    水击压力和调压室涌浪联合计算的程序编制和分析
短句来源
    Water Hammer Control for Pump-Turbines
    水泵水轮机水锤控制方式
短句来源
    The Approximate Solution of Water Hammer Calculation Considerring the Reaction Turbin Boundary Condition
    水锤计算中考虑反击式边界条件的近似解
短句来源
    Solving of Water Hammer by Method of Characteristic curves and Its application In Dong-Lei Pumping Station
    泵站水锤特征线电算解法及其在陕西东雷泵站中的应用
短句来源
    THE DESIGN RESEARCH OF TEST INSTALLATION SCHEME FOR WATER HAMMER AND SURGE CHAMBER
    水击及调压室实验装置方案的设计研究
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  hammer
Drop hammer tests were carried out to study the axial crash behavior of aluminum foam-filled hat sections.
      
The experimental modal analysis was performed on a two-story steel braced frame model excited by simulated ambient vibrations and hammer impacts.
      
Water hammer in hydraulic systems with an annular damper of plastic deformations
      
Results are presented on the theoretical and experimental study of the water-hammer process in a line with an annular plastic-deformation damper.
      
Water hammer and propagation of perturbations in elastic fluid-filled pipes
      
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When the waterway of a hydroelectric station is rather long,the expensive structures of surge chamber are usually required. If it is desired to avoid the use of surge chamber,not only the problem of the higher water hammer pressure but also that of the stability and quality of governing must be solved. In this paper,the control differential equations of governing are given out first,then the critical condition of stability under small oscillation and the method to detrmine the transient process are discussed.The...

When the waterway of a hydroelectric station is rather long,the expensive structures of surge chamber are usually required. If it is desired to avoid the use of surge chamber,not only the problem of the higher water hammer pressure but also that of the stability and quality of governing must be solved. In this paper,the control differential equations of governing are given out first,then the critical condition of stability under small oscillation and the method to detrmine the transient process are discussed.The influences of different factors on the governing quality are analyzed. A procedure of analysis by finite difference method is also presented.Finally, it is pointed out that many projects may be designed and operated without surge chamber, and some problems which need furthur investigation are suggested.

水电站的引水道较长时,常需设置昂贵和复杂的调压井结构.近一二十年来国内外都在研究不设调压井的问题.但这时不仅应解决水锤压力和机组飞逸问题,而且要确定机组的过渡过程和调节质量.另外,也要研究某些水电站在泄洪时尾水振荡对机组运行的影响. 本文较完整地给出调节过程的框图和各环节的控制方程,讨论了小波稳定的判别条件和过渡过程的确定,并讨论了各种因素对调节质量的影响.然后给出差分计算方法.文章最后指出在不少工程中有可能不用调压井并提出对进一步研究工作的建议.

The principle of water hammer discharge measurement in hydropower stations based on the elastic water hammer theory rather than the conventional rigid water hammer theory is presented and a formula is obtained for calculating the discharge, given by

传统的水电站水锤测流理论是建立在刚性水锤理论基础上的,而本文以弹性水锤理论研究水锤测流,并对计算方法和测试条件作出分析,提出的计算流量公式为Qo=(Fg)/l_3(S_1-(S_2/(1+m)))+(FgH_oT)/(2L)((1-m)/(1+m)).

In this paper, the most rational regulation of the wicket gates of a water turbine is determined on the basis of the basic differential equations of water hammer, the pressure of which reaches the maximum at the end of one phase and then remains unchanged. Taking the boundary conditions for a water turbine into consideration in a strict way as well as the effect of friction losses in pipeline, the results of calculation by a digital computer are more accurate in comparison with those obtained from ordinary...

In this paper, the most rational regulation of the wicket gates of a water turbine is determined on the basis of the basic differential equations of water hammer, the pressure of which reaches the maximum at the end of one phase and then remains unchanged. Taking the boundary conditions for a water turbine into consideration in a strict way as well as the effect of friction losses in pipeline, the results of calculation by a digital computer are more accurate in comparison with those obtained from ordinary method. Lastly, a program flow chart is given together with a concrete example.

本文从水锤基本微分方程式出发,按水锤压力在一相末达到最大值,然后维持不变的条件求得水轮机导叶最合理的调节序律。由于在计算中对水轮机考虑了较为严格的边界条件并计及了管道摩阻损失的影响,因而计算结果较一般手算方法精确。最后并给出了程序框图及计算实例。

 
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