基于虚拟样机平台的民用飞机测试性仿真

虚拟样机在飞机设计、试验、制造领域日益广泛而深入的应用是未来航空制造业的大势所趋。本文从并行工程的思想出发,探讨了在虚拟样机平台下开展民机型号测试性工程工作的优势和基本思路,并在此基础上研究了虚拟样机平台下的飞机测试性工程模型,提出了基于虚拟样机的测试性仿真验证的基本方法和过程,并通过实际测试性仿真验证的实例,证明了方法的可行性和有效性。     

基于虚拟样机的轮式装载机开发技术研究

轮式装载机传统开发模式需要经过样机设计、制造、测试、改进等循环过程,存在试制周期长、开发成本高等问题.提出轮式装载机虚拟样机的开发策略,构建虚拟样机的开发平台,研究相关软件的数据交换方法.采用Pro/E创建轮式装载机的实体模型,构建虚拟样机,在ADAMS环境进行仿真研究,利用ANSYS对动臂总成进行了有限元分析,完成了轮式装载机虚拟样机开发的系统性研究.     

HYJ1400型翼缘矫正机虚拟实现与优化设计

介绍了为解决企业生产难题,利用虚拟样机技术虚拟实现HYJ1400型翼缘矫正机设计和制造的思路及技术优势,并简单介绍了HYJ1400型矫正机设计制造的用途、背景、工作原理、结构特征以及应用效果、不足等,针对该矫正机实际应用中存在的缺陷和不足,提出了相关优化措施。     

液压支架虚拟样机设计及应用

虚拟样机用来代替真实样机,用计算机仿真模型数字化技术代替物理样机设计和制造,有多体系统运动学和控制理论等为核心。文章分析了液压支架虚拟样机功能组成,对液压支架虚拟样机设计和应用做了分析。     

垃圾筛分设备的应用与研究

本文主要研究了适合垃圾分选的筛机的工作原理及其相对于一般振动筛的结构改进。并通过ADAMS软件建立了双质体振动,即二自由度振动模型的虚拟样机,对其进行了运动学与动力学分析,获得了改进筛机结构的理论依据和实际方案;最后,还对自制的小型样机进行了实际测试,验证了理论分析的结果。     

虚拟制造技术对企业生产和组织结构的影响

分析了虚拟制造出现的背景，讨论了虚拟制造技术和虚拟制造企业的主要特征及其对企业生产和组织结构的影响，提出了以独立制造岛为基础的虚拟制造方案     

基于虚拟样机技术的自调心焊接滚轮架的研制与应用

基于虚拟样机技术,利用Solidworks软件研制了自调心焊接滚轮架并建立了滚轮架的仿真模型,详细介绍了驱动机构的结构与设备配置设计以及滚轮架的结构、选材与加工工艺设计。根据滚轮架加工工件原理,针对圆形管件、锥形管件和箱体结构,利用虚拟样机技术进行模拟现实仿真,实现了自调心焊接滚轮架的研制与应用,为高效、高精度的先进设计制造技术提供了可行性分析及参考依据。     

船舶虚拟制造系统体系设计及关键技术

给出了船舶虚拟制造系统的定义,设计了包含船舶产品虚拟开发、虚拟工艺和虚拟造船企业环境架构的体系架构,讨论了船舶虚拟制造系统与船舶实际制造系统的相关关系,并从实施船舶产晶开发活动的并行开展和支持船舶生产经营活动的角度出发,为实现虚拟制造技术与造船设计、制造及装配、生产调度、质量管理等环节的有机集成.对船舶虚拟制造系统实现的关键技术进行了分析.     

虚拟制造的定义与关键技术

介绍了“虚拟制造”研究和应用情况,并进行了归纳和分析。就“虚拟制造”的内涵与涉及到的关键技术进行了探讨。从企业生产全过程的角度提出了虚拟加工、虚拟生产、虚拟企业三个平台的体系结构。基于大制造概念,将可制造性分解为可加工性、可生产性、可合作性三个部分。介绍了中国国家计算机集成制造系统工程研究中心正在建立的支持企业生产全过程的虚拟制造平台框架及体系结构。     

可重构游梁式抽油机的设计和仿真分析

借助于可重构制造系统的基本思想 ,论述了可重构抽油机的基本概念、特点及可重构的理论依据 ,并对可重构抽油机的关键环节模块的划分思路进行了探讨。给出了模块划分方案 ,分析了可重构游梁式抽油机的拼装特性。为了对可重构抽油机的性能进行验证 ,提出了将虚拟样机技术应用于抽油机的可重构设计 ,并利用虚拟样机技术软件ADAMS对APIC 32 0D 2 5 6 12 0抽油机进行了运动学和动力学分析 ,验证了虚拟样机技术应用于可重构抽油机设计的可行性。利用游梁式抽油机的可重构设计 ,可以实现抽油机的模块化生产 ,用户可根据需要对抽油机进行重构 ,从而实现了对抽油机传统生产和使用理念的变革     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to