参数变化

Based on the SM-model of the truncated pyramid, the SPIF processes with different parameters were simulated. And the process parameters on changes in the thickness, plastic deformation region, forming force and so on were reseached.

基于方锥台件局部有限元分析模型，对不同工艺参数下的成形过程进行仿真，研究工艺参数板材厚度变化、塑性变形区、以及成形力等的影响关系。

Based on Prandtl's momentum transportation, this paper calculates in detail the physical quantities such as eddy viscosities, and ratio of eddy viscosity to motion viscosity, total stresses with respect to relative position in three regions of viscous sub-layer, buffer layer, and main turbulent stream for non-Newtonian fluid flowing turbulently in ducts, which according to Karman's three layer models and measurement of fluid parameters in evaluation apparatus, discusses the influence of polymer drag reduction on flowing properties of non-Newton fluid, analyzes quantitatively principle of turbulent reduction phenomenon and condition of increasing reduction rate.

摘要以普兰德动量传递理论为基础，按照卡门的三层模型，通过室内模拟环道用0号柴油及加入减阻剂在圆管内的流动参数的测定，计算了非牛顿型流体管内湍流边界层的层流内层、过渡层、湍流中心的涡流粘度，涡流粘度与运动粘度比、总应力随相对位置的变化等定量参数，探讨了高分子减阻剂对非牛顿流体流动特性的影响，对湍流减阻现象的机理与增大减阻率的条件进行了定量分析。

By varying and calculating the several important process parameters of the reactor, it has been finally acquired the favorable conditions of the uniform distributions of velocity and temperature profiles in steady state.

论文摘要：本文利用二维动力学模型，通过变化MOCVD (Metal Organic Chemical Vapor Deposition)反应器的几个重要工艺控制参数，计算了其内部稳态热流场均匀分布的条件，实现了反应器操作参数的优化配置。

Turn-table is one of the devices which are used to simulate aerocraft's performance on the ground .

引言三轴飞行模拟转台是飞行器控制系统地面半实物仿真设备之一，属于复杂的机电系统，它存在很多不利于系统性能提高的因素，诸如电路参数的漂移、轴系间的力矩耦合、负载变化等，这些都容易引起参数时变。

Besides, the detection of a number of target navigation parameters can be estimated. The goal of this paper is to present a PCA electric field algorithm for calculating the target headings, size/velocity rate and port/starboard location in relation to the electric sensor axis. This PCA algorithm is based on the simultaneous analysis of the three components （longitudinal, athwartship and vertical） of the electric signature in order to compare the time evolution of their waveforms as a way to determine the target parameters.

此外，还可估算探测大量的目标航行参数：目的是提供一种主分量分析电场算法，以计算相对电场传感器轴线的目标航向、尺寸／速率、左右舷位置：此种PCA算法基于同时分析电场特性的3个分量，以便比较这些波形随时间的变化，作为确定目标参数的方法。

With the aid of this technique,the precision of fault location could be greatly immune to the external interference,which comes from the variation of line parameters,especially for the variation caused by tough climate or severe chilliness in some areas where the line passes by.

针对由于输电线路参数随外界条件变化而带来的双端测距误差，本文利用现有的双端测距所提供的硬件设备，提出了基于两端数据同步的线路参数在线估计技术和算法。

Blood samples were collected at 0, 5, 10, 15, 30, 45 minutes and 1, 1.5, 2, 3 hours after the drug was given. Serum concentrations of penicillin G were determined by microbiological method. A computer program was used to determine the pharmacokinetic parameters for the blood concentration- time data by compart...

以电子计算机程序处理血药浓度—时间数据，血药浓度随时间变化符合二室开放模型，所得主要动力学参数为：分布半衰期(t1/2α)0.14±0.03h；消除半衰期(t1/2β)0.70±0.21h；表观分布容积0.696±0.141 l/kg；体清除率11.67±1.02 ml/；药时曲线下面积21.57±1.93h·IU/ml，本文还根据单剂量给药参数推算给药方案，供兽医临床参考。

2The static behavior of one prestressed spatial truss string structure is analyzed systematically in this paper. The change of the structural internal forces and displacements with the rise-to-span ratio, sag ratio, prestress and the number of brace struts is studied and the influence of these parameters on the mechanical behavior is discussed compressively in detail.

2对一张弦立体桁架结构的静力性能做了系统分析，研究了结构的内力和位移在矢跨比、垂跨比、预应力和撑杆数不同参数下的变化情况，全面详细的探讨了结构的主要参数对结构静力性能的影响。

It studied many factors such as blank holder pressure, anti-pressure, clearance between punch and bottom die, and parameters of dentiform on blank holder, analyzed the influence of these factors' change to stress and strain field in distortion area and the appearance of shear crack, summarized the appropriate ratio of blank holder pressure and anti-pressure, and the best range of other factors.

从压边力、反压力、相对冲裁间隙、压边圈齿形参数等各种因素出发，分析了这些因素的变化对于变形区应力应变场与剪切面裂纹产生的关系，并得出了压边力与反压力的合适配合比例，以及其他参数的正确取值范围。

In this paper, taking one 1900t/h supercritical pressure once—through boiler installed in East boiler company as subject investigated, analyzing the structure and characteristic of unit, from the mechanism of units, based on the law of quality conservation, energy conservation and momentum conservation, having Lagrange fluid particle tracing idea in hydrodynamics field application in analyzing of unit operational characteristic, author build up the nonlinear distributed parameter general dynamic mathematical model of single-phase heating surface or diphase heating surface in the steam-water system for supercritical pressure once—through boiler, which is suitable numerical calculation and simulation for large scale disturbance and full working conditions change, and enough materializing distributed characteristic of thermodynamic parameter in process and time lag characteristic of energy transportation in tache. The transient responses curve of the system main variables under several disturbance are computed by Computer Simulation for the model, and theoretical analysis shows that the simulation results are reasonable.

本文以东方锅炉集团公司的一台1900 t /h超临界压力直流锅炉为研究对象，在分析机组结构和特性的基础上，从机组的工作机理出发，以质量、能量、动量守恒定律为依据，将流体力学领域中的Lagrange流体质点追踪思想用于机组运行特性的分析上，建立了适用于超临界压力直流锅炉汽水系统单相、双相受热面的非线性分布参数通用动态数学模型，该模型适合于大扰动全工况变化的数值仿真计算，充分体现了过程热力参数的分布特性和环节中能量输送过程的时滞特性，并对模型通过计算机仿真得出各种扰动下系统主要变量的响应曲线，从理论上分析了仿真结果的合理性。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。