脉动的

Thereby we can save a great deal of engineering quantity and improve the rate of building progress. But, there is the mixed free-surface-pressure flow in the tail tunnels with sloping ceiling and big pressure in the hydraulic transient process. It is bad to hydropower stations of its safe and steady function.

但是，变顶高尾水洞内存在较为复杂的流态明满交替流，使水电站过渡过程中可能产生较大的压力脉动，对水电站的安全稳定运行存在一定影响。

Dynamic characteristics of the two models are surveyed. By employing the POD-based spectral representation method, the turbulent wind-velocity field around the bridge is simulated and verified.

根据POD型的谱表示法模拟了桥梁的脉动风速场并进行了相关性拟合检验，然后基于准定常理论计算了作用在模型上的抖振力时程。

This paper is carried out to analyze the buffeting of long-span steel arch bridge in operation and erection stage. The research is mainly focused on the following aspects: Based on the present AR method, the AIC rule is used for fix the rank of the AR model to improve the simulation precision. Take into account that the wind speed spectrum is vary with the height for the long-span steel arch bridge, simulate the fluctuating wind field.

主要工作有以下几个方面：通过对现有的AR法进行改进，采用最小AIC(A-Information Criterion)准则准确识别模型阶数，提高AR法的计算精度，并考虑大跨度钢拱桥风速谱随高度变化的特点，实现了对三维空间脉动风场的有效模拟。

I followed the monthly pulsations of T Monocerotis, the unpredictable quiverings of Y Tauri, and the nightly creep of asteroids.

在那儿，我跟踪麒麟座T 每个月的脉动，金牛座Y 不可预言的亮度变化，以及小行星的缓慢移动。

On system set point, we knew that raw turbidly and flow rate had remarkable effect.

通过对透光脉动检测曲线的解析，研究了检测曲线特征参数的影响因素并分析了特征参数与沉后水余浊的相关性。

Direct current with the positive pole earthed and the negative pole connected to the test electrode by means of a low capacitance unscreened lead.

b直流电源的正极接地，负极由一根低电容的非遮罩电线与试验电极连接。电源输出电压应为脉动因数不大於5%的直流电压。

B Direct current with the positive pole earthed and the negative pole connected to the test electrode by means of a low capacitance unscreened lead.

b直流电源的正极接地，负极由一根低电容的非屏蔽电线与试验电极连接。电源输出电压应为脉动因数不大于5%的直流电压。

Result of theoretical analysis and simulation indicate that bang-bang controller will result in torque ripple. 3. Through analyzing relationship between voltage and flux in induction motor, a stator flux oriented voltage vector control scheme is proposed.

对砰—砰控制的机理和实质加以论述，通过分析和仿真说明，无论是电流、磁链或是转矩的砰—砰控制都将引起转矩的脉动。

By theory analysis and using zero voltage vector,a PMSM DTC control system model has been established in Matlab,and the simulation study shows that zero voltage vector can effectively diminish the torque ripple and improve the system performance.

在理论分析的基础上采用零矢量的控制方案，建立了基于Matlab/Simulink的PMSM直接转矩控制伺服系统模型。仿真结果验证了加入零电压矢量可以有效地抑制转矩脉动，提高系统性能。

Followingly, an interfacial acoustic pressure level at a certain point on the vibrating plate is found with this equation.

以脉动半球声源和固定圆板的一阶振型假设为基本物理模型，导出了不同频率下的振声转换公式，由此求出振动板上某一点处的界面声压级。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。