波动压力

Using wave method to research the hydraulic resonance system of pipe- air chamber .

采用波动法对导管-气室水力共振系统进行了研究，表明水力共振系统在合适的系统结构参数和流体参数情况下，可以使导管出口处的压力高于入口处的压力。

In this paper, a performance index, which is used to evaluate the operating uniformity of multi-cyclinder engine, is presented based on the fact that the fluctuation of gas pressure in the expansion stroke cyclinder leads to the fluctuation of instantaneous angular velocity. The value IP is propotional to the fluctuation of instantaneous angular acceleration. Fuzzy diagnostic index for misfire fault is introduced and investigated also in this paper.

根据多缸发动机曲轴瞬时转速波动不均匀性主要由缸内循环气体压力波动不均匀性引起这一基本事实，以曲轴瞬时转速的实时检测为基础，在一个工作循环内按着火顺序将作功冲程中瞬时角加速度的波动作为评定各缸工作不均匀性的指标，将所得IP模糊化用于多缸机的故障诊断也作了初步的探讨。

Results of experiment and theoretical analysis indicate that free water movement in wood under floating pressure consists of two parts, one is mass movement caused b capillary pressure, the other is the movement of water vapor produced by evaporation or ebullition of free water, and the latter dominates the moving process of free water.

试验结果和理论分析显示，在真空－浮压干燥过程中自由水的输运由两部分完成，一部分为毛细管压力下液体的团块迁移；另一部分为在压力梯度下，由于压力波动而引起自由水的蒸发或沸腾后所产生的水蒸气的迁移，且后者在自由水的迁移过程中占主导地位。

A set of governing dynamic equations with different basic unknowns and with different hypotheses is presented. Thereafter, the 3-D non-axisymmetric governing dynamic equation is solved by means of Fourier expanding and Hankel integral transform method.

在Biot两相介质波动理论的基础上，直接用Fourier展开和Hankel积分变换技术分析三维非轴对称饱和弹性土层和饱和弹性半空间波动方程，首次得到用积分变换形式表示的，三维非轴对称饱和弹性土层和饱和弹性半空间，以饱和土土骨架位移和孔隙水压力为基本未知量的基本解。

Otherwise, supply pressure can be kept steadily and the pressure vibration in the oil tank can be smoothed.

另外，成功解决了稳定压力源供给和压力输入造成油箱内的压力波动问题。

The paper carried out combination calculation on two kinds unsteady flow problems of pressure water diversion of hydropower station (i.e. pressure fluctuation of water hammer and mass fluctuation of surge chamber), which changed many analytical error caused by considered these two phenomena separately, and such result meets the inherent rule of pressure water diversion system transient of hydropower station much more than before.

2实现了水电站有压引水系统中两种非恒定流问题(即水锤的压力波动和调压室的质量波动)的联合计算，改变了把这两种现象分开单独考虑所带来的分析误差，这样的计算结果更加符合水电站有压引水系统中过渡过程的内在规律。

The invention comprises that:(1) an injectant containing air is formed and the injectant is injected into a manto (3) through an injection well (2) or a recovery well (1);(2) the pressure of the injection well (2) and the recovery well is kept (1) for a period of time so that the oil and the injectant are mixed into more uniform fluid;(3) the pressure of the injection well (2) and the recovery well (1) is decreased, the pressure of the manto(3) is decreased and the oil-containing mixed fluid is obtained from the recovery well (1) or the injection well (2);(4) the procedure of (1),(2) and (3) is repeated, the pressure fluctuation of the fluid in the manto (3) is realized until the oil recovery rate is less than the economic recovery rate.

本发明包括：①形成包含气体的注入剂，将注入剂通过注入井(2)或采收井(1)注入矿层(3)；②保持注入井(2)和采收井(1)的压力一段时间，使油分和注入剂混合形成比较均匀的流体；③然后降低注入井(2)和采收井(1)的压力，降低矿层(3)压力，并在采收井(1)或者注入井(2)获取含油混合流体；④不断重复步骤①②③，实现矿层(3)中流体的压力波动，直到石油的采收率低于经济开采率为止。

Under the condition of mining pressure the flow pressure of gas in fissured coal fluctuates at the beginning of seepage, and the amplitude depends on the differential pressure between the two ends of flow field.

在采动压力条件下，瓦斯在裂隙煤体中的流动压力具有波动性，波动幅度的大小与流场两端的压力差有关。

The unsteady seepage problems of bank slope due to water level fluctuation, including variations of pore water pressure, pore air pressure, capillary pressure and water saturation were simulated numerically.

同时分析了某土质边坡在水位波动影响下的孔压（孔隙水压力、孔隙气压力和毛细压力）及含水量变化情况。

In this paper Ⅰ successfully applied these methods to fault diagnosis, and presenting some new innovative machinery fault diagnosis method; First Ⅰ present a new gear wornout fault diagnosis method, this method use the vibration signal's time-frequency attribute and instantaneous phase undulation to accurately detect gear's fault, and by comparing with the traditional frequency domain analysis method, this method reveals that many nonlinear and nonstationary characteristic exist in gear's vibration, this tell us that if we use frequency domain analysis method without pay attention to the signal's characteristic, we could get wrong diagnostic result; Then Ⅰ present a new bearing fault diagnosis method, this method use ATVFD and Hilbert transform to do envelop demodulation,Ⅰ analyze the envelop with time-frequency method and find out that this method is more accurate then traditional method.Ⅰ also explain that the modulation of the fault to the carrier wave may also be non-stationary and nonlinear; Finally Ⅰ present a cylinder pressure measurement method of diesel engine by means of vibration, cylinder pressure is an important parameter of diesel engine fault diagnosis, the pressure measuring is simplified a lot by this method,Ⅰ also use the ATVFD and time-frequency analysis to realize it.

本文中将上述理论方法成功地应用到故障诊断中去，提出了几点创新性的诊断方法；提出了一种齿轮磨损故障诊断的新方法，该方法利用振动信号能量的时频域分布特征与瞬时相位波动特征可以进行精确的齿轮故障诊断，并通过与传统的频域诊断方法的比较，揭示出齿轮振动中存在的明显的非线性与非平稳特征，说明了不加选择地利用频域分析方法进行齿轮故障诊断很可能会得到错误的诊断结果；提出了一种轴承故障诊断的新方法，该方法利用ATVFD分解与Hilbert变换进行包络解调，并对解调得到的包络信号进行时频域分析，可以实现更加准确轴承故障诊断，说明了故障对载波信号的调制往往也是非平稳与非线性的；提出了一种利用振动信号进行柴油机汽缸内压力检测的新方法，柴油机汽缸压力的变化是柴油机故障诊断的重要参数，利用振动方法可大大简化汽缸压力的检测过程，该方法也是综合利用ATVFD分解与时频域分析方法实现的。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。