查询词典 unsteady

In order to optimize the spring of the reciprocating pump valve and establish the best spring factor matching, the unsteady opening-closing process of the poppet valve was simulated. The simulation based on computational fluid dynamics approach, and the dynamic-grid technology and User Defined Function was conducted to depict the law of motion of the poppet valve.

采用RNG k-ε湍流模型、动网格技术以及用户自定义程序，对往复泵泵阀的启闭过程进行了非定常数值仿真，得出了不同弹簧因素下、阀门从开启到关闭的过程中，阀芯的升程随时间的变化规律、阀的迟滞关闭时间以及阀芯落座的瞬时速度。

Based on the simulation of 3D unsteady muzzle brake flow field, computed the force given to the barrel while the powder flow through the muzzle brake, calculated the max backlash velocity, and lastly got the efficiency of muzzle brake.

该方法以带炮口制退器三维非定常流场的数值模拟为基础，通过计算火药气体流经制退器时火炮身管的受力，计算出身管在火药气体作用下的最大自由后坐速度，进而根据制退器效率的定义得到炮口制退器的效率。

Further, he was not fond of change nor unsteady, but he loved to stay in the same places, and to employ himself about the same things; and after his paroxysms of headache he came immediately fresh and vigorous to his usual occupations.

而且，他不喜欢变动不居，而是爱好住在同一个地方，专注于同一件事情，在他的头痛病发作过去之后，他又马上焕然一新，精力充沛地去做他通常的工作。

The main results are as follows:(1) In unsteady phase, ground fissures caused by collapsing facilitate the loss of soil water. The soil water content of fissure district is about 50% less than that of non-fissure district of subsidence area, which close to or below wilting coefficient. This will be a great threat for the survival and growth of vegetation.

取得的主要进展和认识如下：(1)塌陷非稳定阶段，塌陷裂隙对土壤水分散失具有重要影响，与塌陷区非裂缝带土壤水相比，塌陷裂缝部位土壤水分损失几乎达50%，接近或低于凋萎系数，对植被生存、生长构成威胁。

In fact, associated with the development of ship CFD, solving the unsteady wave-making problems will be one of the important research subjects of ship CFD.

事实上，随着船舶CFD技术的发展，求解非定常兴波问题将是船舶CFD势流方法的主要研究方向之一。

The mechanism of the energy separation of a vortex tube is caused by the unsteady variation of pressure, viscosity stress and heat transfer through the energy equation.

本文在涡流管机理研究方面，从能量基本方程出发，推导出引起能量分离的因素是压力的不定常波动、粘性应力和热量传递。

The rolling-up of the leading-edge vortex sheet and interaction with the trailing-edge vortex are simulated numerically by using the two-dimensional unsteady analogue and vortex-in-cell method.

本文应用二维非定常比拟和恪子涡(Vortex-in-Cell)方法，数值模拟了三角翼前缘涡层的卷起以及与尾涡的相互作用。

The PIV measurement results show the properties and structures of the unsteady flow field in which a train of vortex ring s are formed at the sharp edge of the orifice, thus the energy and mass flux are .

通过对射流出口涡环的产生、发展及运动特性的分析，认识到涡环之间相互作用是形成&零质量&射流的流动机理。

The macro-analysis shows that the causes of the crisis relate closely with the unbalance economy development, unfinished political reforms, and the unsteady cultural and moral systems in China while the micro-analysis proves that there still exist "vacuum spaces" of management in ideology, systems, subjects and mechanisms.

其诱因在宏观层面上与经济、政治、文化紧密相关，具体表现在经济发展具有不均衡性、政治体制改革有待深化和传统道德文化体系的失稳上；在微观治理方面，则存在着缺陷甚至于&治理真空&，主要表现在意识、体系、主体、体制与机制等方面。

Because of the particularity of this system and the complexity of the hydraulic phenomena of unsteady flow, it is essential to research its hydraulic transients in order to provide scientific basis for this type power station design.

鉴于跨流域引水水电站引水发电系统所具有的特殊性和引水发电系统非恒定流水力现象的复杂性，有必要对其进行水力过渡过程研究，为该类型电站设计提供科学依据。

Finally it offers the analysis of the fault-tolerance system as well as its test verification.

这样，运行于空间环境中的系统的设计目标就是在保证系统实时性

However, it is still difficult to find out the real reason of the increase of the keratinized gingiva during the orthodontic extrusion whether it is due to the proliferation of the gingival tissue or to its elastic nature, that is because the proliferation of the fibroblasts as well as the connective tissue changes in volume and the intra-fibers spaces were all immeasurable in most of the studies.

然而，仍然难以找到真正的原因增加的角化牙龈在正畸挤压它是否是由于扩散的牙龈组织或其弹性性质，这是因为增殖的成纤维细胞以及作为结缔组织的变化量和内部纤维空格都是不可估量的，大多数的研究。