查询词典 acceleration time

At first in the preliminary design this paper computes the linear damping coefficient of the viscous damper employed in this project using Composite Response Spectra approach, meantime, this paper proves that reducing the exponent of velocity of the piston can increase the magnitude of the dissipative energy, because of the viscous damper employed in the practical project character nonlinear behavior; next this chapter performs analysis and comparison between the building without and with the viscous dampers aforementioned when the building suffers from various Time Domain Response, from the angle of displacement, interstroy drift, velocity, interstory velocity, acceleration, energy, maximum axial force of the dampers and of the column etc., in order to prove that the incorporating the viscous dampers into the buildings has great superiority on enhancing its aseismic performance ; furthermore, this chapter also expatiates on diverse assembly form of the viscous dampers that results in the adverse impact on the internal force of the structural member in this building, on the ground of which this segment bring about the preference of the assembly form of the viscous damper; finally this chapter points out the sphere of application of the analysis and computation using Composite Response Spectra approach in design: it is available in well-proportioned stiffness structures and isn抰 available in the structures that contain weak story. It is recommendable, particularly, to incorporate the fluid viscous dampers into this structure that contain weak story to refrain earthquake and reinforce, such as the Central Hall of Shanghai Exhibition Hall.

首先使用了反应谱分析法设计出欲附设的粘滞阻尼器的线性阻尼系数，由于实际工程所用的粘滞阻尼器具有非线性的特性，故而笔者又证明了降低速度指数对提高粘滞阻尼器的耗能量的优势所在；接着分别从位移、层间位移、速度、层间速度、加速度、能量、最大阻尼出力和柱轴力等不同的角度对结构在附设粘滞阻尼器前后的时程反应进行了分析对比，籍此在实际工程中证明了附设粘滞阻尼器对于提高结构的抗震性能的优越性；再者，笔者还阐述了采用不同的粘滞阻尼器布置方式对结构中构件内力特别是柱轴力和基座竖向反力产生的不利影响，并在此基础上提出了布置方式的优选；最后，指出了反应谱法在设计中的适用范围：对于均匀结构反应谱法能够使用，而对于含有薄弱层的结构反应谱法并不适用；对于类似于上海展览馆中央大厅的含薄弱层的结构尤其值得使用粘滞阻尼器的方法进行抗震加固。

The results show that although the acceleration period is very short, the time needed for the whole system to reach a thermal equilibrium is very long.

对轴承系统运行的几种典型瞬态问题，包括启动、加速和受到突加载荷时的轴承运行状况进行了分析。

Vehicle side slip angle is considered as mapping of time series of yaw rate and lateral acceleration. A uniform design project is used to select training samples, and the relationship of the three state parameters is established through neural network.

把汽车侧偏角看作横摆角速度和侧向加速度时间序列的映射，采用均匀设计方案对训练样本进行优选，通过神经网络建立三者之间的映射关系。

Results:After we adopted uniform temperature acceleration to observe its stability laid aside for some time, we found out that the freeze - drying wa...

结果：我们采取等温加速实验法对本品放置后的稳定性进行了观察，结果表明冻干剂较水溶液稳定，存放周期延长、不易氧化。

Numerical simulations were done for a bistable latch valve of the system by FLUENT, and three groups of datum for different fluids were obtained with the same effective exit sectional area. Besides, a static mathematic model for the electromagnetic valve was established based on the obtained datum. Secondly, the motion of the valve spool was realized by UDF file in FLUENT. Three kinds of motions, uniform, acceleration and motion driven by the coupling effect of the liquid resistance and the electromagnetic force, were calculated and compared. The dynamic characteristic of the electromagnetic valve was obtained by analyzing the relationship of the mass flow rate of the inside flow field of the electromagnetic valve, the change of the drop pressure of the passageway of the valve, and motion time.

并针对系统中的某双稳态电磁阀，使用商用CFD软件FLUENT对其进行内部流场的数值模拟，通过使用不同流体介质，不改变阀门有效出口截面积的情况下，分析得到的三组数据，建立了该电磁阀的静态数学模型；通过编写UDF文件，实现对阀芯运动方程的控制，在阀门做由闭合到开启、开启到闭合运动时，控制阀芯分别做匀速运动、匀加速运动以及阀芯受到液体阻力与电磁力作用力的耦合力的运动，分析了三种工况下电磁阀内部流场质量流率和阀门出口入口压降的变化以及运动时间，从而得到该电磁阀的动态特性。

At that time, to reactivate its world hegemony and effectively strike momentum for economic acceleration of the emerging economies had become an unpublicized secret in heart of American decision layer.

重振世界霸主雄风，有效打击新兴经济体的经济增长势头，此时便成为美国决策层心头一个"不便公开的秘密"。

El Centro is input, simulation calculations are made on floating-peak tank with circular-ring energy dissipater. The research indicates this control system is effect to apply to decrease earthquake response. History time curves of displacement, absolute acceleration, shearing force and uplift angle are contrasted with and without control. The effect of sets of cirque costing-energy is discussed.

对实际应用的浮顶罐进行了数值仿真计算，所采用的控制体系具有较好的减震效果；对比了储液容器液固耦合质量无控与有控时的位移、绝对加速度和基底剪力和提离转角的时程曲线；探讨了圆环套数对减震效果的影响。

Three objective measures of voluntary cough (expulsive phase rise time; volume acceleration, and expulsive phase peak flow) were each associated with aspiration risk category (areas under the curves, AUCs, were 0.93, 0.92 and 0.86, respectively).

自主咳嗽的三个客观性指标(排出相上升时间、容积加速和排出相峰值流量)均与误吸的风险类型（曲线下面积AUCs分别为0.93、0.92和0.86）有相关性。

The meridionally accelerated axial-flow fans including meridian acceleration rotor, vaneless diffuser and volute was numerically simulated in the whole flow passage by Reynolds time-averaged N-S equations with tensor and k-ε turbulence model.

采用三维雷诺时均N-S方程和标准k-ε湍流模型，对包含叶轮、无叶扩压器与轴向蜗壳于一体的子午加速风机进行了整机全流道的数值模拟。

The conventional SHPB technique is improved by using a pulse shaper. Pulse shapers technique is used to modify the incident wave and decrease the effect of wave dispersion to ensure stress equilibrium and homogeneous deformation in specimen, and furthermore a constant strain rate is attained during the loading history. The lasting time of acceleration pulse is enhanced to numerable MSEL, which is more close to actual loading.

本文改进了传统的霍普金森压杆技术，采用波形整形技术，改变加载波形，获得了比较光滑的入射波，降低了波的弥散效应，保证实验时火工品试样中的应力平衡和均匀变形，得到了更接近常应变率的动态加载条件，使加速度脉冲持续时间t提高数倍，更加真实的反映了火工品实际加载环境。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷