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近似模型
相关语句
  approximation model
    In order to reduce the computational cost without losing accuracy in the result,we construct every discipline's approximation model via approximation methods,and it can reduce the much time that every discipline expends,then the process of aircraft multidisciplinary design optimization could be successful.
    为了减少计算时间,但又不会对各学科计算结果造成太大的影响,因此我们用近似方法来建立各学科的近似模型,以此来减少每次迭代时各学科所用的大量计算时间,使飞机多学科设计优化可以顺利的进行下去。
短句来源
    If we substitute actual model for approximation model,the precision of approximation model is very important.
    如果用近似模型来代替真实模型,那么近似模型精确度就变得非常重要。
短句来源
    While approximation model is very close to actual model,and the precision of approximation is very high,the result of optimization is significant,and authentic;
    近似模型和真实模型相差不大,近似的精度很高,优化出的结果就是有意义的,可信的;
短句来源
    First,the paper gives the experiment design method for constructing approximation model.
    本文首先给出了建立近似模型前所需的实验设计方法。
短句来源
    The paper presents an algorithm combining Square Response Surface and Radial Basis Function Neural Network to solve the question that RBFNN is often difficult to meet the precision request of approximation model.
    由于用径向基神经网络方法构造近似模型常常难以满足精度要求,本文还提出了一种把二次响应面与径向基神经网络方法相结合的算法。
短句来源
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  approximation models
    STUDY ON LUMPED PARAMETER APPROXIMATION MODELS OF DISTRIBUTED PROPELLANT FEEDLINES ——MODAL APPROXIMATION MODELS
    推进剂供应管道的集中参数近似模型研究——模态近似模型
短句来源
    If we select experiment points by experiment design method, experiment points may be more uniform and more typical. ,and it can prepare good foundation for constructing precise approximation models.
    用实验设计方法选择实验点,可以使实验点更均匀,更具有代表性,从而为建立精确的近似模型打下良好的基础。
短句来源
    A new method of modeling distributed parameter turbulent pipes by using modal approximation methodology was presented. Two kinds of modal approximation models for both hydraulic and adiabatic pneumatic turbulent pipes-the I R C and effective laminar flow modal approximation models were developed.
    提出了用模态近似法建立分布参数湍流管道的集中参数近似模型的新方法,发展了适用于水力和绝热气体湍流管道的两种模态近似模型:I-R-C模态和等效层流模型。
短句来源
    Taking example for a test function and a straight airfoil,making use of the four methods to construct the approximation models of test function and the airfoil structure and aerodynamic disciplinary,and summarize the four methods'characters and availability in every model.
    结合测试函数和某机翼模型为例,分别用这四种方法构造测试函数和某机翼结构和气动学科的近似模型,并总结这四种方法的特点和在对各种模型近似中的适用性。
短句来源
    The sufficient accurate approximation models of objective and constraint functions in the wing structure optimization model are built when using the model management framework, therefore in the evolutionary algorithm a number of finite element analyses can be avoided and the satisfactory multi-ob-jective optimization results of the wing structure of the high altitude long endurance UAV are obtained.
    采用模型管理框架可以建立满足精度要求的目标及约束的近似模型,使演化算法不仅避免了大量的有限元分析计算,而且获得了满意的该高空长航时无人机机翼结构的多目标优化设计结果。
短句来源
  “近似模型”译为未确定词的双语例句
    A VIBRATION PROPAGATION MODEL UPON AXISYMMETRIC VISCOUS LIQUID BRIDGES IN MICROGRAVITY
    微重力下轴对称粘滞流体桥振动传播的近似模型
短句来源
    Beginning with response surface approach model, the uncertainty model usingmultidisciplinary design parameters as perturbations is deduced, which not only decreases conservative characteristics of uncertainty expression, but also reduces computational complexity for control discipline, thus improves the convergency degree of optimization algorithum.
    从响应面近似模型出发,推导得到将多学科设计参数直接作为摄动量的不确定性模型,减小了不确定性描述的保守性,降低了控制学科计算量,提高了优化设计算法的收敛性,将鲁棒控制优化和并行子空间优化方法相结合,实现了控制学科与其它学科的并行设计与优化,成功将该方法应用到某无尾布局MAV气动、控制学科优化设计中。
短句来源
    Improves the academic achievements of former scholars, puts forward a model of multi-class dynamic differential pricing for the air passenger transport, which is based on the maximum revenue for the airline industry, and gives a approximate arithmetic of the model, then showes the application of the model and its feasibility on increasing airline industry’s revenue by 25 models.
    引入一种旅客到达频率预测的统计方法,以航空公司收益最大化为目标,建立基于多等级定价基础上的动态差别定价模型,即多等级动态差别定价模型,给出模型的递归算法,通过对动态差别定价模型的运行结果进行分析,建立模型的一种近似模型,并且用25个简单算例说明模型的用法以及在提高航空公司收益方面的可行性。
短句来源
    The result shows that the optimization method based on approximation technology has good global performance and also can greatly save the calculating resources.
    结果表明基于近似模型的优化方法不仅全局性良好,而且有效节约了计算资源。
短句来源
    A Less Time-Consuming Method of Evolutionary Algorithm for Complex Engineering Optimization Problems
    演化算法中近似模型构造方法及其工程应用
短句来源
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  approximation model
An alternative description of the Pt isotopes using a simple, single configuration, the two-parameter interacting boson approximation model Hamiltonian, is discussed.
      
The work is based on the use of the second-order differential equation, the so-called equation of the dynamics of self-developing processes, as an approximation model.
      
Second approximation model for optical head in super high density storage technology
      
A new approximation model is developed for the output probability density functions so that the dynamic part of the system is decoupled from the output probability density functions.
      
Our results can be very well described within the random phase approximation model.
      
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  approximation models
A classification has been proposed for empirical models of analytical peaks that systematizes known approximation models.
      
Second Generation of Correction Methods in Electron Probe X-ray Microanalysis: Approximation Models for Emission Depth Distribut
      
In this context, the calculations for elastic p+8He scattering within the JLM and eikonal-approximation models are performed by using the cluster-orbital-shell-model-approximation parameters for the density distribution.
      
The common approximation models and geometrical shapes of VOC sorption isotherms are discussed.
      
Numerical analysis of thermal convections in a three-dimensional cavity: Influence of difference in approximation models on nume
      
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In researching space shuttle reentry, determination of entry flight corridor and entry trajectory is one of the fundamental subjects. Some detailed recommendation about this work was published abroad(l), and some authors in our country (2, 3, 4) begin to notice this important subject during demonstrating conceptive scheme of space shuttle. However, an effect of the earth selfrotation to reentry motion was not considered in the fundamental model. Such approximate model does not satisfy the requirement for further...

In researching space shuttle reentry, determination of entry flight corridor and entry trajectory is one of the fundamental subjects. Some detailed recommendation about this work was published abroad(l), and some authors in our country (2, 3, 4) begin to notice this important subject during demonstrating conceptive scheme of space shuttle. However, an effect of the earth selfrotation to reentry motion was not considered in the fundamental model. Such approximate model does not satisfy the requirement for further development. In this paper, a precise model has been established and a simulated result concerning scheme of space shuttle has been given.

在研究航天飞机再入返回问题时,确定再入飞行走廊和再入飞行轨迹是基础的研究问题之一。对于这方面的工作,参考文献[1]作了较详细的介绍。国内的一些作者在航天飞机方案论证时开始注意考虑这类重要的问题[2、3、4]。然而,他们所讨论的基本模型没有考虑地球自转对再入运动的影响。这种近似模型,对深入一步的方案论证就显得不能满足了。本文建立了一个精确的模型,给出与方案论证有关的仿真结果。

The effects of different diffusion models are studied for electron distribution of plasma sheath aboutreentry bodies. The diffusion velocity of electron due to density gradients is much larger than that ofions because the weight of the electrons is about three orders in magnitude less than that of the ions.Both the charge separation and its induced electric field exert an influence on the particle diffusion. Theelectron density distribution is obtained with numerical solution under these conditions. The results...

The effects of different diffusion models are studied for electron distribution of plasma sheath aboutreentry bodies. The diffusion velocity of electron due to density gradients is much larger than that ofions because the weight of the electrons is about three orders in magnitude less than that of the ions.Both the charge separation and its induced electric field exert an influence on the particle diffusion. Theelectron density distribution is obtained with numerical solution under these conditions. The results arecompared with other diffusion models such as the quasi-neutral model, ambipolar diffusion model,etc. It shows that the quasi-neutral assumption is valid in most region of the flowfield, but the chargeseparation occurs near the body surface. The dimension of the thin layer with charge separation is in thesame order of Debye shield length. The electric particle distribution is influenced somewhat by theboundary effects although the neutral moleculars and atoms are unaffected. The applicability of thesediffusion models is judged through their comparaision of the numerical solution.

本文研究不同的扩散模型对再入体等离子体鞘电子密度分布的影响。由于电子和离子的质量相差三个量级以上,电子的浓度扩散速度比离子大得多,引起正负电荷分离。由此产生的诱导电场又阻碍带电粒子的扩散运动。本文同时考虑这二种影响扩散的因素,得到了非平衡等离子体鞘带电粒子分布的数值解,并与准中性模型、双极扩散模型等其它三种近似模型进行了比较。计算表明:流场的大部份区域满足等离子体准中性假定,但在物面和激波附近存在电荷分离较明显的薄层,其厚度约为Debye屏蔽长度的量级。这种边界效应对中性粒子的分布影响甚微,但对带电粒子的分布则产生一定的影响。由此可以判断各种扩散模型的适用性。

A wall pressure signature correction method is developed to detennine the semiempirical correction factors suitable to the similar geometric model in a typical test attitude,in order to correct the wall interference on the model in other tested attitudes with a high angle of attack.In this way the correction procedure for the high angle of attack model tested is as easy and convenient as a semiempirical method,meanwhile it remains accurate enough comparing to the standard wall pressure signature method.The demonstrations...

A wall pressure signature correction method is developed to detennine the semiempirical correction factors suitable to the similar geometric model in a typical test attitude,in order to correct the wall interference on the model in other tested attitudes with a high angle of attack.In this way the correction procedure for the high angle of attack model tested is as easy and convenient as a semiempirical method,meanwhile it remains accurate enough comparing to the standard wall pressure signature method.The demonstrations with two sets of models pres-ented indicate good results.

提出用壁压信息洞壁干扰修正法,确定出大攻角典型试验状态的半经验修正系数,用它修正外形近似的模型大攻角试验其它状态的洞壁干扰。这样,模型大攻角试验的洞壁干扰修正既能接近壁压信息修正法的准确结果,又能如半经验修正方法那样简便。经两组模型试验数据验证,结果满意。

 
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