查询词典 variable compression ratio

After multi-objective optimization pressure ratio equaling 32 and compression ratio equaling 13 were obtained.

经过多目标规划计算后得到了气动发动机在最佳工况时的工作参数和气缸的几何尺寸。

In this program, the declining segment of the stress-strain relation of the concrete, the restriction effect of hooped reinforcement and the bond-slip problem of the reinforcement are considered, as the same time the optimized arithmetic is applied to accelerate calculation procedure. Though the appropriate experiment arrangement, the influential factor such as the strength of concrete, the ratio of hooped reinforcement, the ratio of axial compression and the loading angle are researched, some available rules of carrying ability and ductility of the special-shaped column can be attained.

程序中考虑了混凝土应力应变曲线的下降段及箍筋对混凝土的约束影响，采用了合适的算法加速计算过程并考虑了纵筋锚固滑移的影响，通过正交试验分析了混凝土强度、体积配箍率、轴压比和荷载角对异形柱截面抗弯承载能力及截面曲率延性比的影响。

This requirement ensures that the slenderness ratio of the individual Csection between connectors is less than or equal to one-half of the slenderness ratio of the entire compression member in the case that any one of the connectors may be loosened or ineffective.

这个要求确保在任一连接件可能松脱或失效的情形下，单段U型钢的长细比小于或等于整个抗压构件长细的二分之一。

First, the conception of wet compression is defined. A calculation method of moist air and wet gas thermodynamics properties is set up, which treat them as real gas and can give out the results of any water-air/gas ratio. Second, the thesis build the simulation model of water injection between compressor stages of a single shaft gas turbine, based on which the stable analysis is processed and the characteristics of key performance parameters are given out, such as the variation of air flow, pressure ratio, turbine inlet temperature with the water quantities. Results showed that enhancement of power output is outstanding.

文中定义了湿压缩概念，研究适用于计算机计算的湿空气，湿燃气等实际气体的热物性计算方法，利用此法可较准确地计算任意水气比下湿空气，湿燃气的各热物性参数，建立并推导单轴燃气轮机级间喷水热力循环的数学模型，用此模型进行稳态循环分析，并得出级间喷水时燃气轮机各主要性能参数的变化规律，如随喷水量变化，空气流量、压比、燃气初温等的变化规律。

According to different axial compression ratio and slenderness ratio, this paper designs 12 types of square section column and 12 types of I section column single-story steel frame structures, and gives overall dimensions and characteristic parameters, then provides data for establishing ANSYS finite element models.

按照不同的轴压比和长细比分别设计 12 种柱截面为方形的单层钢框架和 12 种柱截面为工字形的单层钢框架，给出了单层钢框架体系的总体尺寸及特性参数，为 ANSYS 有限元分析提供建模数据。

The main research contents are as follows:1. Through massive calculation, analysis and comparison, sum up the similarities and differences between the special-shaped cross sections and rectangular cross sections in mechanical features, between reinforced concrete special-shaped columns and rectangular columns in load-bearing capacity, ductility performance and provide necessary basic concepts and data for further understanding the characteristics of the special-shaped columns;2. Through massive elastic calculations and elasto-plastic analysis, under the preconditions of satisfying the code's requirements for axial compression ratio, limit value of lateral displacement and load-bearing capacity of normal section,oblique section and beam-column joint, under circumstances of different intensity of earthquake, structure dead weight, sort of site and column grid bay dimension, the variation regularity of maximum suitable height of structure, and thus sum up the maximum suitable height of structure for code for the purpose of macro-control while deciding the design scheme;3. Make a preliminary study on the stress feature of reinforced concrete special-shaped column and Z-shaped column of which the ratio of limb length to limb thickness is between 4~5 ,and the preliminary design method is suggested;4. Through elato-plastic time history dynamic analysis of typical projects, check up the weak storey of the special-shaped column structure and yielding, breaking and collapse mechanism to satisfy the earthquake resistant requirement to buildings of remaining stand under strong earthquake;5. Derive for project use simplified calculation formula of vibration period, suitable vibration period, suitable rigidity of special-shaped column structure through theoretical analysis, and provide an easy and practical method for deciding the structure scheme economically, safely and reasonably;6. Based on the study achievements in theory and massive analysis and calculations of this paper, sum up the regularities of inner force, deformation of special-shaped column structure and seismic conceptual design, and thus the suggection of seismic design of special-shaped column structures is presented.

本文研究的主要内容如下：通过大量的计算、分析和对比，总结出异形截面与矩形截面在力学特性、钢筋混凝土异形截面柱与矩形截面柱在承载能力、延性性能等方面的异同，为深入了解异形截面柱的特点提供必要的基本概念和数据；通过大量的弹性及弹塑性计算分析，在满足规程对轴压比、侧移限值及正截面、斜截面、节点承载力抗震验算要求的前提下，在不同抗震设防烈度、结构自重、场地类别及柱网开间尺寸情况下最大适宜高度的变化规律，并在此基础上总结归纳出异形柱结构的最大适用高度规定，可用于规程，以便于在确定方案时起到宏观控制的作用；对肢长与肢厚比在4～5的钢筋混凝土异形截面柱及Z形柱的受力特点进行初步探讨，提出初步的设计方法；通过对典型工程的弹塑性动力时程分析，检验异形柱结构的薄弱层及屈服、破坏、倒塌机制，以达到建筑物大震不倒的抗震设防要求；通过理论分析，推导出异形柱结构自振周期，以及适宜自振周期、适宜刚度的工程实用简化计算公式，为经济、安全、合理地确定结构方案提供简便实用的方法；在本文理论分析、计算以及大量的研究成果基础上，总结归纳出异形柱结构内力、变形的规律及抗震概念设计内容，并在此基础上提出异形柱结构的抗震设计建议。

The contents from the third chapter to the fifth chapter are the kernels which are a series of applications of generalized regression model and generalized regression estimator. At first, this paper constructs ratio model, linear regression model, post-stratified regression model and nonparametric regression model through different regressive relationship between auxiliary variable and study variable.

首先是依据辅助变量与研究变量之间回归关系的不同，分别建立比率模型、线性回归模型、事后分层回归模型和非参数回归模型，然后再利用第二章中推导出的广义回归估计理论，对各种回归模型辅助下(来源：A4bBC12论文网www.abclunwen.com)的估计方法进行了系统性研究，从而构成了模型辅助估计方法的整个研究体系。

Elasticity is the ratio of the percent change in one variable to the percent change in another variable.

弹性是一个变量变化百分比相对一一个变量变化百分比的比率。

In economics, elasticity is the ratio of the percent change in one variable to the percent change in another variable.

在经济学中，弹性是一个变量变化百分比相对一一个变量变化百分比的比率。

The ratio of direct cost is the top one input variable which is needed to be reduced to certain level for efficiency improvement through our slack variable analysis.

而由差额变数分析得知，投入变数部份皆有须减少投入的情况，其中须灭少比例较多之投入变数为直接成本率。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。