积分元

In addition,the effects of line integral and restricting the wave-steepness of the elementary waves were estimated numerically.

同时研究了线积分项和限制基元波波陡对于兴波阻力计算结果的影响。

The approximation error is defined as the integral of the minimum distance between each surfel on the original model and the fitting surface.

算法中的逼近误差定义为原始模型各面元到拟合曲面最小距离的积分。

In this method, the precision is improved from three aspects of unknown interpolation, integral region and normal directions.

在该方法中，从未知量插值、积分区域和法线方向三个方面提高了边界元计算精度。

The formula was established about calculating design parameters and technological parameters of ideal strip and bent strip in the period of forming. The thesis presented how to calculate the deformed area length and contact are radius of contact deforming between two elastic bodies on condition of the friction. The calculating formula of pinch force about plate-strip pinch mill was given and the results were analyzed that friction coefficient and radius of pinch rolls are very important for determining pinch force. Moreover, the rule of deforming and stress distribution of different 〓 ratio were gained on condition that the deforming was considered to be non-uniform distribution in the gap. The differential equations were got that calculate the displacements of large deflection of elastic cantilever rectangle plate with fixed end and the formula of the Finite Strip Method was conducted to study the regularity of mid-plane displacements, deformation and stresses for elastic-plastic large deflection bend of cantilever parallelogram plate with fixed or slidable end by integrating Prandtl-Reuss equation.

建立了一套完整的设计参数计算公式和在成型过程中理想带钢或具有月牙弯带钢的工艺参数的调整公式；在考虑摩擦力的条件下，对两弹性体接触变形过程中的接触变形区长度和接触弧半径用位移解法进行了研究，推导了板带递送机的递送力计算公式，从而得知在递送机设计过程中，应选择适当摩擦系数和辊身直径；另外，还从辊缝内带钢实际变形出发，分析了对于不同的〓值，带钢的变形规律及应力分布状况；建立了固定端悬臂矩形板弹性大挠度弯曲变形的控制方程，并且在对Prandtl-Reuss方程的积分处理的基础上，导出了固定端和滑动端悬臂平行四边形薄板的弹塑性大挠度的中面伸展位移、变形和应力的有限条元法公式，编写了Fortran语言计算程序，在各种参数条件下，对螺旋焊管成型过程变形规律进行了全面的分析研究，从而为螺旋焊管的生产和进一步的改进提供了理论依据。

The application of DRBEM to Poisson equation is discussed.

以Poisson方程为例对双互易边界元法的边界积分方程的推导以及数值实现进行了探讨。

Heat conduction equation ; Galerkin boundary element method ; Indirect boundary integral equation ; Simple layer potential2000 MSC:35F99; 35K05; 80M15

热传导方程； Galerkin边界元法；间接边界积分方程；单层位势

Structure ; sound radiation ; boundary element ; singular integral ; multi-frequency calculation ; sound radiation mode ; sound radiation sensitivity

国家自然科学基金；攀登计划结构；声辐射；边界元；奇异积分；多频计算；声辐射模态；声辐射灵敏度

Structure; sound radiation ; boundary element; singular integral ; multi-frequency calculation; sound radiation mode ; sound radiation sensitivity

工程科技II，工业通用技术及设备，声学工程结构；声辐射；边界元；奇异积分；多频计算；声辐射模态；声辐射灵敏度

Except the same characteristic as the conventional boundary element method, this method avoids the nearly singular integral , so it is one of effect numerical calculation methods.

该方法继承了传统边界方法的优点，而避免了传统边界元方法遇到的边界积分奇异性问题，是该问题一个十分有效的数值求解方法。

Wave equation ; spectral element method ; time integral method ; aeroacoustics

波动方程；谱元方法；时间积分方法；气动声学

This paper discusses design and realizable methods of remote test output interface from logical design angle.

本文从逻辑设计的角度讨论遥测输出接口的设计及实现方法。

This also 星体投射plies to buildings, structures and geological features.

这也适用于建筑物和地质特征。