搜索结果: 1-14 共查到“工学 fluctuation”相关记录14条 . 查询时间(0.093 秒)
Lateral Stability Analysis of Hypersonic Vehicle under Pressure Fluctuation by Solving Mathieu Differential Equation
Lateral Stability Analysis of Hypersonic Vehicle Pressure Fluctuation Mathieu Differential Equation Fluid Dynamics
2012/4/20
Two recent test failures of Hypersonic Technology Vehicle 2 impose a strike to the increasingly growing enthusiasm, not only on the United States side. It is important to find out the exact failure re...
This work investigates the effect of phase fluctuation averaging on phase fluctuation induced by intrachannel four-wave mixing (IFWM) in highly dispersed differential phase-shift keying transmission s...
Research and practice on fluctuation water injection technology at low permeability coal seam
Low permeability coal seam Fluctuation water injection Permeable agent Dust fall Rock burst Cooling
2012/3/31
In order to solve the problem of poor affusion effect on low permeability coal seam, the paper analyzes the micro process of the coal seam water infusion in wetting coal and determines the main factor...
Calculation on Cylinder Pressure Fluctuation by Using the Wave Equation in KIVA Program
combustion pressure oscillation acoustic pressure knock
2011/8/5
Cylinder pressure fluctuation during combustion process of internal combustion engine is closely related to combustion noise and knock. The current studies are based on cylinder pressure test to obtai...
Calculation on Cylinder Pressure Fluctuation by Using the Wave Equation in KIVA Program
combustion pressure oscillation acoustic pressure knock
2011/8/5
Cylinder pressure fluctuation during combustion process of internal combustion engine is closely related to combustion noise and knock. The current studies are based on cylinder pressure test to obtai...
压电式高压共轨喷油系统喷油量波动特性试验（Investigations into Multiple-injection Fuel Quantity Fluctuation for High Pressure Common Rail System with Piezo-actuated Injector）
压电喷油器 高压共轨 油量波动
2010/12/28
研究了压电式高压共轨喷油系统多次喷射过程中影响主喷油量波动的因素，采用EFS IFR8420型单次喷射仪对预喷和主喷的油量及喷油速率进行精确测量，总结了主喷油量波动的影响因素及其变化规律:预喷油量越小、主预间隔时间越短，主喷油量波动幅度越大，且随着主预间隔时间的增加，主喷油量呈周期性波动且波动幅度逐渐衰减。通过试验确定了预喷产生的压力波动是导致主喷油量波动的主要原因，为后续的多次喷射控制策略的设计...
Dispersion Fluctuation Equalization Nonlinear Fibers by Spatially Controlled Tension
Nonlinear optics parametric processes
2015/6/9
We experimentally verified that spatial dispersive fluctuations in nonlinear fiber can be effectively suppressed by inverting precisely mapped zero-dispersion wavelength via application of longitudina...
离心泵内部不稳定流场压力脉动特性分析（Analysis on Pressure Fluctuation of Unsteady Flow in a Centrifugal Pump）
离心泵 非定常 压力脉动 RNG k-ε湍流模型
2010/4/1
离心泵内部流场压力脉动是影响机组运行稳定性的关键因素，采用RNG k-ε湍流模型和滑移网格技术研究泵内部非定常流动,得到了不同工况下监测点的压力脉动情况，并对其进行了频域分析。分析结果表明，叶轮与隔舌间的动静干扰是产生压力脉动的主要脉动源，并在整个离心泵流道内传播；且在不同工况下，叶片通过频率均占主导地位，压力面脉动幅值大于吸力面脉动幅值；蜗壳出口同一测面脉动情况近似。 The pressure ...
双蜗壳泵压力脉动特性及叶轮径向力数值模拟（Numerical Simulation of Pressure Fluctuation and Radial Force in a Double Volute Pump）
双蜗壳泵 压力脉动 径向力
2009/11/24
为揭示双蜗壳离心泵的水力不稳定性，采用雷诺时均方法和SST k-ω湍流模型，对一双蜗壳双吸离心泵进行了三维非定常湍流数值模拟，得到了泵内部流场特性及双蜗壳内压力脉动情况，并对其进行了频谱分析。结果表明双蜗壳内存在比较明显的压力脉动。设计工况下压水室内的压力脉动强度小于非设计工况。在设计工况下，隔舌处和隔板区压力脉动频率均以叶片通过频率为主，其中隔板起始端的脉动幅值最大，约为隔舌处的2.5倍。在大流...
基于压力脉动和时序分析的离心泵空化特征提取（Study on the Method of Centrifugal Pump Cavitation Feature Extraction Based on Pressure Fluctuation and Time Serials Analysis）
空化 压力脉动 时间序列 残差
2009/8/11
根据压力脉动幅值对空化变化相当敏感的特点，利用离心式水泵试验平台模拟空化现象，获取水泵出口压力信号。研究发现，在空化发生时刻，水泵出口压力的轴频幅值增大，且存在 很多低频脉动成分。同时，根据试验获取的壳体振动和出口压力信号，分别建立该水泵正常运行的时间序列数学模型，利用模型残差的方差值判别离心泵的运行状态，实现对其空化特征的识别。
多缸柴油机转速波动与燃烧不均匀性的相关性（Correlation between Fluctuation of Speed and Combustion Nonuniformity in a Diesel Engine）
多缸柴油机 转速波动 燃烧不均匀性
2010/2/26
测量了不同转速和负荷下V型6缸增压柴油机6个气缸内的瞬态压力和瞬时转速波动，分析了瞬时转速波动和各缸燃烧不均匀性的相关性。试验表明：多缸柴油机相邻的两缸压力峰值对应的曲轴转角之间总会出现一个转速波动峰值，并且某一缸燃气对活塞作功越大，随后出现的转速波动峰值越大，反之，转速波动峰值越小；当平均转速一定时，负荷越大，转速波动率也越大；负荷相同时，转速波动率的大小与转速没有单调变化关系。 For a V...
Moments of the density microscopic fluctuation and SAS backgroundcontribution
Porod’ s law density microscopic fluctuation background contribution
2009/2/6
Some models of density microscopic fluctuations have been numerically analysed in order to study thebehaviour of the related background contribution. The results suggest that this contribution can fai...
Time-frequency analysis of spontaneous fluctuation of the pupil size of the human eye
spontaneous pupillary fluctuation spectral analysis
2011/5/5
The aim of this work has been to develop a new method of variability description for the spontaneous pupillary fluctuation (SPF) signal, based on the time-frequency analysis. In the work we have studi...
Effect of MHD on edge electrostatic fluctuation with lower hybrid current drive in the HT-7 tokamak
2007/7/28
专著信息
书名
Effect of MHD on edge electrostatic fluctuation with lower hybrid current drive in the HT-7 tokamak
语种
英文
撰写或编译
作者
B. J. Ding,G. L. Kuang,J. F. Shan,et al.
第一作者单位
出版社
Plasma Phys. Contr. Fusio...