计算机机电暂态仿真、RTDS电磁暂态仿真的混合仿真设计构想

本文所研究的混合仿真设计主要是基于计算机机电暂态仿真、RTDS电磁暂态仿真。尤其尽两年电力系统的巨大发展,大容量输电工程的建成对数字仿真提出了更高的要求,本文就针对电力系统的特性设计了计算机与RTDS的混合实时仿真平台,详细分析混合仿真接口方案中的关键技术,构造等值模型来正确反映对侧系统的运行状态,并结合相关直流系统案例验证本文所设计的仿真平台是具备有效性和可行性,以供参考。     

分布交互仿真及其关键技术

分布交互仿真技术是一门新兴的综合技术，具有广泛的实用价值，本文论述了分布交互仿真的概念，特点和其在武器装备方面的作用以及适合分布交互仿真的ＡＴＭ网络等关键技术。     

计算机仿真辅助消防指挥相关问题探讨

对城市火灾的消防扑救指挥的发展需要,本文提出了建立在计算机仿真之上的辅助消防指挥决策系统,分析了系统的模型架构。并就其信息整合、调度规划、三维视景仿真、决策评估等关键技术作了探讨。     

虚拟制造中仿真技术的应用

虚拟制造系统是现实制造系统在虚拟环境下的精确映射,是利用计算机模型仿真真实系统中的物理和逻辑活动。本文指出仿真是实现虚拟制造的主要手段。仿真在制造系统中的应用按照人的介入与否分为一般仿真层和虚拟现实层。分析了两层之间的联系与区别,列出了各层仿真的主要内容和可实现的程度;介绍了目前主要的虚拟制造仿真软件;最后,给出了三维动画表示的生产线虚拟仿真的一个实例。     

面向CIMS的集成多方位建模与仿真框架

首先分析了几种常用建模方法，包括ＩＤＥＦ０、ＩＤＥＦ１、动态建模方法及ＯＭＴ方法。然后提出了一个集成多方位建模与仿真框架，它将功能、信息、动态视图及仿真核心集成在一起，实现了仿真模型的自动生成，它使得在系统功能设计早期就能预见，评价未来系统的有关动态品质。     

基于反馈仿真场景的监控系统设计和实现

在不适宜人工作的非寻常环境下,以前一般采用数字监控和视频监控的方法,这两种方法都不能同时保证直观性和精确性。为此,需要一种仿真监控的方法。文中以一个海底隧道工程为例,分析了仿真监控系统结构,并给出了现实反馈算法,构造了工程施工仿真监控系统。     

风荷载作用下的高耸结构多媒体仿真环境研制

本文结合作者运用多媒体仿真技术，研制风荷载作用下高耸结构计算机仿真系统的实践，论述为实现工程力学场和建筑形态变化的动态仿真，建造适用系统环境和工具的关键技术和方法     

电子电路中计算机仿真系统智能化的研究

目的 探讨电子电路中的计算机仿真系统中智能化的应用。方法 在电子电路仿真系统中建立完整的模型库和数据库，使电子电路仿真系统体现较高的智能水平。结果 由于建立较完善的电子电路仿真系统，提高了实验教学效果。结论 由于人工智能的引用，提高了电子电路仿真培训系统的性能。     

并行工程管理系统研究

并行工程管理系统是并行工程的核心，它由产品开发过程建模仿真与优化子系统和产品开发过程管理与协调子系统组成。本文讨论了开发过程建模的ＩＤＥＦ３过程描述获取方法，提出了系统的体系结构和主要功能，建立了面向对象的产品开发过程仿真机制。     

轿车车门内板冲压成形计算机仿真

介绍了采用基于动态显式算法的有限元分析软件包eta/DYNAFORM对典型的汽车覆盖件轿车车门内板冲压成形进行计算机仿真的全过程.论述了覆盖件冲压零件计算机仿真必须注意到的问题,并探讨了其中的关键技术.     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.