涡流

This paper analyzes the principle of the rotating permanent magnet eddy current brake and designs its structural mechanism.

分析了旋转型永磁涡流制动机的工作原理，并进行了涡流制动机机构设计。

Magneto-optic imaging technology is a new method of eddying measurement, which not only preserves the merit of conventional eddy current inspection, but also realizes the visual NDT of sub surface's minute defect by replacing measuring coil by laser.

磁光成像技术是涡流检测技术的一种新方法。这种方法不仅保持了传统涡流探伤方法的优点，而且用激光取代了测量线圈，实现了对亚表面细小缺陷的可视化无损检测。

Based on the first and second law of thermodynamics, entropy generation theory is applied to establish vortex tube model.

根据热力学定律，采用最小熵产分析方法，建立了涡流管的热力学模型，得出了产生所需冷热端温度同最小压比之间的函数关系，并在h—s图上表示出涡流管能量分离热力过程。

The combustion events in the swirl chamber and the main chamber are processed differently. The combustion in the swirl chamber is broken into three phases: low temperature ignition, high temperature premixed combustion and flamelet diffusion combustion, while the combustion in the main chamber is only considered as flamelet diffusion combustion. The Shell ignition model, global Arrhenius equation and coherent flamelet model are used to describe low temperature ignition kinetics, high temperature premixed kinetics combustion and flamelet diffusion combustion respectively.

把涡流室式柴油机不同区域与不同时期的燃烧过程分开处理，将涡流室中的燃烧过程划分为三个性质不同但相互重叠的阶段：用Shell着火模型模拟的低温着火化学动力学反应阶段，用Arrhenius方程模拟的高温预混燃烧化学动力学反应阶段和用相关火焰微元模型模拟的扩散燃烧阶段，认为主燃烧室的燃烧只有相关火焰微元的扩散燃烧阶段。

This paper describes in detail the working principles,structure and frequency response characteristics of an eddy geophone.

本文详细地介绍了涡流地震检波器的工作原理、结构及其频率响应特性——涡流检波器的输出特性在固有频率之上是按外界激励频率的平方递增。

Boundary polynomial point interpolation mesh-free method and boundary radial point interpolation mesh-free method were presented, based on polynomial basis and radial basis respectively for transient eddy current analysis, and their interpolation shape functions satisfy the Kronecker delta function and the essential boundary conditions can be directly imposed on the boundary nodes. An example on analyzing transient eddy current of a square metal column was set to prove the validity of the proposed methods, and a comparison on accuracy between BPPIM and BRPIM was analyzed as well.

运用多项式点插值法和径向基点插值法构造形函数，推导了适合于工程电磁场瞬态涡流问题的多项式基点插值边界无单元方法和径向基点播值边界无单元方法，这两种方法的空间插值形函数满足Kronecker delta条件，从而强加边界条件可以直接施加在边界点上，以金属长方柱的瞬态涡流分析作为数值算例，证实了两种方法的正确性和有效性，并对两种基类的点插值法进行了精度分析和比较。

To solve the problems that cyclic variation is high in low power output and NOx emission is high in high power output in compression ignition engine with compressed natural gas direct injection,a swirl chamber combustion system with glow plug ignition was developed.

针对缸内直喷压燃式天然气发动机低负荷循环波动大及高负荷NOx排放偏高的问题，设计开发了涡流室式热面点火燃烧系统，研究了涡流室通道尺寸对缸内天然气空气混合气形成、着火燃烧及发动机运转特性的影响。

It pressed noise effectively and got the two orthogonal vectors of impedance. The experimental results indicate that this method has good stability and precision, it also can be regarded as reference for some other eddy current NDT.

这种方法有效的抑制了噪声，实现了双频涡流检测的阻抗正交分解，实验表明，该方法稳定性和精度较好，对其他涡流检测也有借鉴作用。

In this paper, the status and the development home and abroad of the PEC technology are illustrated.

本文首先阐述了脉冲涡流检测技术的特点以及国内外研究现状和发展趋势，论述了脉冲涡流作用原理及其理论基础。

Some new method is presented in this paper: A. An Integrated parameters computation method to analysis asynchronous operation of the turbine generator is given, including the equivalence of short circuit and open circuit of field windings, deducing boundary condition of 〓 method and computing frequency parameters. B. A new memory structure for sparse complex matrix and a PCCG method based on it are introduced to save memory and computation time. C. An equivalent method of vacuum is presented, and effectively eliminate the effect of corner point and accelerate convergence of PCCG method. D. Coupling the computation of electromagnetic and temperature field is discussed and model for computing temperature field of the turbine generator rotor at asynchronous operation is built.

文中提出了以下新方法：(1)在失磁异步运行转子三维涡流场计算中提出了完整的参数计算方法，其中包括励磁绕组开、短路的等效，〓法边界条件的推导及频率参数的计算方法；(2)提出了铁心内空气域的等效方法，有效地解决了开槽引起的角点奇异问题，并提高了方程组的迭代收敛速度；(3)在〓法有限元模型中，创立了一种能节约内存、提高计算速度的压缩存储矩阵格式，并建立了基于该格式的方程组解法；(4)提出了涡流电磁场和温度场两种不同场计算的合理结合方法，建立了转子三维稳态和时变温度场的有限元计算模型。

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。