动力系数,dynamic coefficient
1)dynamic coefficient动力系数
1.This paper derives the relations of turbine absolute inner efficiency relative increase anddynamic coefficient ,discusses the importance ofdynamic coefficient in regenerative units thermal economic benefits analysis .推导了汽轮机绝对内效率的相对提高值与动力系数的关系 ,以实际例子论述了动力系数在回热机组热经济性分析中的重要
2.The dynamic testing method of a prestressed continuous box bridge, the testing result and the analysis of thedynamic coefficient are presented.文章拟介绍某预应力箱形桥梁的动力测试方案 ,动力系数测试结果及分析 。
3.Analysis and probe for choice ofdynamic coefficient of centrifugater in earthequakeproof design of floor girder in continuous oil refining plant with largescale centrifugater were made.就装有大吨位离心机的工业车间防振设计中如何正确合理的选取离心机动力系数问题进行了分析与探讨,并通过算例说明了合理地选取动力系数的重要性。
英文短句/例句
1.power coefficient功率系数,动力系数
2.NUMERICAL INVESTIGATION OF AERODYNAMIC FORCE COEFFICIENTS FOR A FLOW ABOUT AN OSCILLATING CIRCULAR CYLINDER振动圆柱绕流气动力系数的数值模拟研究
3.coefficient of kinetic viscosity动力粘性系数,动力粘度
4.spare coefficient of motive-power machine动力机功率备用系数
5.parameter optimization of dynamic systems动力学系统参数寻优
6.functional optimization of dynamic systems动力学系统函数寻优
7.coefficient of technical equipments to labour劳动力技术装备系数
8.THE LYAPUNOV EXPONENT OF VORTEX DYNAMICS点涡动力系统的Lyapunov指数
9.Numerical computation of aerodynamic drag coefficient for high temperature particles高温固体颗粒气动阻力系数数值计算
10.Parameter Design for the Power Train and Analysis of the Dynamic Performance of Electrical Vehicle电动轿车动力系统参数设计和动力性能分析
11.Research on Optimization and Simulation Design of Automatic Transmission汽车动力传动系参数的优化仿真研究
12.Powertrain Parameter Optimization of the Parallel Hybrid Electric Vehicle并联式混合动力汽车传动系参数优化
13.The Luminosity Function for the Member Galaxies and the Dynamics of the Clusters;星系团成员星系光度函数及其动力学
14.Dynamical systems examples from mathematical biology and population dynamics.来自生物数学和种群动力学的动力系统的例子。
15.Study on Parameter Selection and Matching of Hybrid Electric Vehicle Drivetrain;混合动力汽车动力系统参数选择及匹配研究
16.Dynamic-Stiffness Coefficients and Dynamic Response of Embedded Foundations;埋置基础动力刚度系数与基础动力响应
17.Hybrid Bus Power System Paramenters Matching and Optimizing混合动力客车动力系统参数匹配和优化
18.Study on Assembly Parameter Matching and Simulation of Hybrid Electric Bus混合动力客车动力系统参数匹配与仿真研究
相关短句/例句
Dynamic factor动力系数
1.With the increase of vehicle speed and the improvement of bridge structures,it becomes important for designers to reasonably choose the dynamic factors for the active load of vehicles when passing through bridges.随着行车速度的提高和结构形式的不断发展 ,如何合理采用车辆活载的动力系数 ,已日益引起桥梁结构设计者的重视 。
2.Through calculation, we know that the simply supported beams with equal spans and the trains will have one to two resonant speeds during high speed, the brid ge s dynamic factors between different spans have little change, and the train s running comfort differs a little during no.计算表明 ,等跨布置的简支梁桥在高速范围内会有 1~ 2个共振速度 ;桥梁的动力系数各孔变化不大 ,反映旅客乘坐舒适度的列车平稳性指标在前 4孔稍有变化 ,从第 5孔开始稳定 ,说明铁路长桥采用等跨布置是可行
3.4 Guangzhou subway were analyzed as case study ,by establishing a dynamic analysis model of LIM train-bridge system, the analysis on the responses of bridge under the action of running train was conducted, combination with experimental analysis, a reasonable formula for determination of the dynamic factors is presented.本文以广州市轨道交通四号线高架结构为工程背景,通过建立直线电机(LIM)列车-桥梁体系动力分析模型,对直线电机作用下桥梁的动力响应进行了分析,结合动力系数现场测试结果,提出了直线电机(LIM)列车作用下桥梁动力系数建议公式。
3)impact factor动力系数
1.The influences of vehicle model and running speed of vehicle were investigated,and the dynamicimpact factors of cable-stayed bridges were discussed.研究结果表明,大跨度斜拉桥主梁的振动响应以静位移和长周期振动成分为主,拉索局部侧向振动不明显,车辆计算模型对结构振动响应的影响十分有限,行车速度的提高增加了结构的动力系数,两种拉索材料对斜拉桥在车辆荷载下的振动响应影响很小,斜拉桥的动力系数离散性大且与构件类型有关。
2.Through an analysis of the field test data on two mass transit bridges in Shanghai and a comparison with foreign vibration theories, the paper holds that vehicles on the mass transit and on the railway lines are different both in velocity and in characters, and theimpact factor on the mass transit bridge is less than that on the railway bridge structures.通过对国内外既有铁路桥规、车桥振动理论分析以及现场试验数据的对比,提出城市轨道交通桥梁车辆竖向荷载的动力系数建议公式。
4)seismic coefficient动力系数
1.Based on a great deal of FEM analyses, the distributing law ofseismic coefficients in rock slope is concluded in this paper.在大量有限元动力计算的基础上,分析总结了岩石边坡地震动力系数的分布规律,提出了一个简便易行,又能在一定程度上合理体现岩石边坡地震动力响应特征的岩石边坡地震作用近似计算方法。
2.Based on a great deal of FEM dynamic calculating results, the distribution law ofseismic coefficients in the rock slope is summed up in this paper.在大量有限元动力计算的基础上,分析总结了岩石边坡地震动力系数的分布规律。
5)hydrodynamic coefficients水动力系数
1.Source-sink distribution method for solvinghydrodynamic coefficients of asymmetrical section;源汇分布法求解非对称剖面水动力系数
2.Influence of the distance between floating bodies onhydrodynamic coefficients of floating multi-body system;浮体间距对多浮体系统水动力系数的影响
3.Calculation ofhydrodynamic coefficients of slender body in narrow channels;狭水道中细长体水动力系数的计算
6)hydrodynamic coefficient水动力系数
1.A method of evaluating the influence ofhydrodynamic coefficients on controllability of submarine;评估水动力系数对潜艇操纵性影响的一种方法
2.The effects of shallow water depth on thehydrodynamic coefficients of a 160kDWT FPSO;浅水深对160kDWT FPSO水动力系数的影响
3.Aiming at the motion equation of underwater vehicle,ahydrodynamic coefficient sensitivity index is introduced.针对水下航行器操纵运动方程,引入水动力系数敏感性指数的概念。
延伸阅读
阀门技术注重流量系数和气蚀系数阀门的流量系数和气蚀系数是阀的重要参数,这在先进工业国家生产的阀门资料中一般均能提供。我国生产的阀门基本上没有这方面资料,因为取得这方面的资料需要做实验才能提出,这是我国和世界先进水平的阀门差距的重要表现之一。3.1、阀门的流量系数
阀门的流量系数是衡量阀门流通能力的指标,流量系数值越大,说明流体流过阀门时的压力损失越小。
按KV值计算式
式中:KV—流量系数
Q—体积流量m3/h
ΔP—阀门的压力损失bar
P—流体密度kg/m3
3.2、阀门的气蚀系数
用气蚀系数δ值,来选定用作控制流量时,选择什么样的阀门结构型式。
式中:H1—阀后(出口)压
H2—大气压与其温度相对应的饱和蒸气压力之差m
ΔP—阀门前后的压差m
各种阀门由于构造不同,因此,允许的气蚀系数δ也不同。如图所示。如计算的气蚀系数大于容许气蚀系数,则说明可用,不会发生气蚀。如蝶阀容许气蚀系数为2.5,则:
如δ>2.5,则不会发生气蚀。
当2.5>δ>1.5时,会发生轻微气蚀。
δ<1.5时,产生振动。
δ<0.5的情况继续使用时,则会损伤阀门和下游配管。
阀门的基本特性曲线和操作特性曲线,对阀门在什么时候发生气蚀是看不出来的,更指不出来在那个点上达到操作极限。通过上述计算则一目了然。所以产生气蚀,是因为液体加速流动过程中通过一段渐缩断面时,部分液体气化,产生的气泡随后在阀后开阔断面炸裂,其表现有三:
(1)发生噪声
(2)振动(严重时可造成基础和相关构筑物的破坏,产生疲劳断裂)
(3)对材料的破坏(对阀体和管道产生侵蚀)
再从上述计算中,不难看出产生气蚀和阀后压强H1有极大关系,加大H1显然会使情况改变,改善方法:
a.把阀门安装在管道较低点。
b.在阀门后管道上装孔板增加阻力。
c.阀门出口开放,直接蓄水池,使气泡炸裂的空间增大,气蚀减小。
综合上述四个方面的分析、探讨,归纳起来对闸阀、蝶阀主要特点和参数列表便于选用。两个重要参数在阀门运用中 。