Due to this , it is important to improve the hydraulic power system and enable it to control the pressure change at the measuring points of the servo valve , thus to develop the syt - ii servo valve overlap hydraulic measuring platform and improve the processing quality of servo valve 因而对其油源系统加以改进,使其能控制伺服阀测量口处压力变化,进而开发出高精度的恒压油源,研制出syt - ii型伺服阀叠合量液动测量台,提高伺服阀的加工制造水平。
The conveying medium in pipe has great effect on buried pipeline ’ s damage , its flow pattern , temperature , pressure change , velocity , all of these can influence the shell of pipe and its stress distribution . so it is very important to analyze the fluid - pipe coupling 管道内部的输送介质对管道破坏影响也很大,管内介质的流态、温度、压力变化、流速等对管壁变形和应力分布都有影响,故管道内流体和管道间的耦合分析对地下管道破坏分析很重要。
This constant - pressure hydraulic power adopts plvc4 programmable logical controller for valve to control the electro - hydraulic proportional relief valve to adjust the pressure at the entrance of the servo valve and makes it change with the pressure change at the exit thus to keep the pressure difference constant 此恒压油源采用阀用可编程控制器plvc4控制电液比例溢流阀调节伺服阀入口压力,使其跟随伺服阀出口压力变化,达到入出口压力差值恒定的目的。
When the temperature of the medium is constant , the analysis of data presents that the diffusion coefficient of moisture increases with the reduction of absolute pressure and the rise of changing rate of pressure , among which the effect of the latter makes a big difference compared with that of the former 由数据分析可见，当介质温度一定时，木材水分扩散系数随绝对压力的减小和压力变化速率的加大而增加，且压力变化速率对扩散系数的影响大于绝对压力的影响。
It can be used not only to change the fire precision of the base bleed projectile , but also to improve the effect of reduction drag and expansion range . the calculating model of the secondary expansive pressure of the burning gas is constructed by means of analysis of the experimental resuits , it has been confirmed that the new base bleed unit can be designed , with the secondary expansive principle of the burning gas pressure . the engineering project of a hybrid base - bleed - rocket high - level efficient extended - range projectile is designed , with the secondary expansive principle of the burning gas pressure , the feasibility and the true worth of its engineering applications is validated in theory 本文提出了底排燃气压力不随外部压力变化，既可改善底部弹射击精度又可提高减阻效果的二次扩张原理，建立了底排燃气二次扩张压力的计算模型，并通过采用二次扩张原理的新型底排装置与传统底排装置的对比试验，验证了新型底排装置结构实现的可行性；完成了基于底排燃气二次扩张高效增程原理的底排?火箭复合高效增程弹方案设计及其有关计算，从理论上验证了其工程应用的可行性和实际价值。
For two up and down jets plunging into a cushion pool , two factors of up depth and down depth of water cushion are first introduced actually , then the methods calculating the reasonable depth of cushion pool and the reasonable distance between up jet and down jet are introduced 针对上、下双股水舌入射水垫塘时水垫塘底板上的压力变化规律，首次根据射流理论提出了上、下水垫深度的概念及其计算方法，并进而提出了计算水垫塘合理深度及水垫塘内水舌合理入水间距的方法。
Oscillometric method is the advanced method for the no invasion blood pressure measurement . it qualitatively provides the order of the pulse pressure signal ' s changing with the cuff pressure and quantificationally points out the relationship between the mean blood pressure value and the pulse wave signal . so this method gives us a more scientific way to find other blood pressure parameters 测振法( oscillometricmethod )是无创血压测量中先进的检测方法，它定性地揭示了脉动压力信号随袖带压力变化的规律，并给出了平均压与脉搏波信号的定量关系，为血压参数进一步确定提供了一条更为科学的方法。
By measuring pressure induced by dynamiting which located various positions of the circular shell , the localizational effect of impact force on the circular shell is disclosed . also , pvdf piezofilms are used to determine accurate time while projectile contacting target , accurate time while two interfaces of the target contacting at a initial distance of 5 , and the contacting pressure between the two interfaces when the projectile is in 500m / s to looom / s . experimental results , which are consonant with computer simulation , supply support to engineering 通过对化爆模拟加载试验中柱壳不同角度压力的监测，揭示了化爆模拟产生的压力局域化效应，为进一步模拟设计提出研究的方向；采用pvdf压电薄膜来监测弹靶碰撞的时刻、细小间隙的闭合时间以及由此产生的压力变化，通过对pvdf压力计测试结果分析以及和数值模拟结果的比较，获得规律性的认识，为进一步的应用提供了技术支持。
