查询词典 mathematical model

The ellipse curre equation of circular image is derived based on the theory of spatial analytic geometry and rotation matrix s representation with unit quaternion then a mathematical model of the distortion error is established which relates the distortion error to the foca length of the used CCD camera,the radius as well as the position and the attitude of the inspected circle directly.

研究三维视觉检测中圆的中心经针孔摄像机成像后存在畸变误差的问题，首先基于空间解析几何理论和旋转矩阵的四元数表示法推导出像平面上投影椭圆的参数方程；然后根据参数方程建立圆中心成像畸变误差的数学模型；最后对影响畸变误差的主要因素进行分析。

To solve the problems in present hydraulic calculations of gas pipe network such as numerous data-inputting, unprecise output and a lack of hydraulic calculation methods to keep consistent with steady flow and non-steady flow in real working conditions of gas pipe network, in the paper the author has set up a mathematical model of heat transfer process of gas in pipes on the basis of thermodynamic basic theories and obtained more accurate calculation methods of gas storage quantity in long conveying pipes and urban pipe network of high pressure. This research achievement has been applied to real pipe network.

本文研究目的是解决目前燃气管网水力计算中存在的诸如输入数据繁琐、计算精度不高、缺乏符合实际燃气管网工况的稳定流及不稳定流管网水力计算方法等问题，试图根据热力学基本理论建立燃气在管道中传热过程数学模型，给出较为精确的长输管线及城市高压管网储气量的计算方法，并将研究成果应用于实际管网运行中。

Moreover, there are some unsteady factors occur in practical tub flowing, In article, the change of phase state and unsteady flow factor in flow process are considered, the mathematical model is established.

文中综合考虑了流动过程中相态的变化和非稳定流动因素的影响，建立了数学模型，该模型能正确地预测产水凝析气井的井筒动态。

But this appraisal method relies on excessively much in the actual appraisal utilization valuator's experience, and it is few to the mathematical model utilization.

本文以理论联系实际，定量分析和定性分析相结合的方法，研究如何在房地产估价中引入特征价格理论，与市场比较法有机结合，建立房地产估价模型。

In this paper the dynamic mathematical model of CFB boiler was established and the dynamic performance under variation of different parameters was simulated.

文中对其建立了动态数学模型，仿真了在参数变动下锅炉的动态特性。

This paper first expounds the principle of the bearingless induction motor, gives the mathematical model of bearingless induction motor and analyzes the rotor flux orientation vector control system of the bearingless induction motor.

本文阐述了无轴承异步电机的基本工作原理，并建立了无轴承异步电机的数学模型，分析了无轴承异步电机的转子磁场定向矢量控制系统。

It is well known that rotor parameters of induction motor are subjected to variability and hard to be measured, which will deteriorate performance of control systems based on the mathematical model depending upon rotor parameters, such as rotor flux oriented vector control system, indirect self-regulation.

由于工作原理和材料结构上的原因，异步电机的转子侧参数易变难测，因此所有建立在异步电机动态数学模型基础之上并且利用转子侧参数进行控制的调速系统都或多或少地受到转子参数变化的影响，例如广泛采用的按转子磁链定向的矢量控制系统。

In the fourth chapter, using the magnetic vector potential as the unknown variable, a mathematical model for numerical calculation of the magnetic field and loss distribution in 3-phase 5-limb transformer core is presented.

第三章针对变压器铁心结构的特点，对各向异性非线性边值问题的有限元分析方法进行了详细的阐述，并推导出了实用的N-R格式及单元分析格式，对具有多媒质单元的有限元分析方法进行了介绍，为变压器铁心磁场及损耗分布的数值计算奠定了基础。

The system of vitriol is very complex and there is no a appropriate mathematical model to veraciously describe the Gas Liquid Equilibrium so far .

硫酸体系非常复杂，到目前为止仍然没有合适的数学模型能够准确描述硫酸体系的气液相平衡。

It can provide verisimilar shift load for propulsive motor, and simulate the stable and dynamic property of the marine propeller that works under different conditions well and truly.Firstly this paper introduces the character of propeller and the effect between propeller and ship. Secondly provides a design of this simulating apparatus and selects some important parts according to the request of lab. Thirdly develops the simulating systems mathematical model to make engineering design and analysis.

本文首先分析了船用螺旋桨的工作特性以及与船体的相互作用；其次根据其特性制定了仿真装置的设计方案，并根据电力推进实验室的要求对仿真装置的主要部件进行了选择：然后建立了仿真系统的数学模型并对其进行工程设计及分析；最后详细介绍了仿真装置的DSP控制系统与主回路系统，并针对各部分的具体要求提供了相应的解决方案。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。