虚拟样机技术在复杂产品性能分析中的应用

以复杂产品喷气式飞机着陆性能分析为例对虚拟样机技术、仿真技术进行了深入的分析,应用了三维建模软件Pro/E与动力学仿真分析软件ADAMS,研究了ADAMS中Aview模块和ASolver模块的仿真分析技术,提出了运用虚拟样机技术的路线及具体实现步骤,实现了飞机机械系统建模和着陆系统动态仿真与分析,为同类产品的设计开发和性能分析提供了好的借鉴方法。     

发动机与液力变矩器共同工作虚拟样机仿真

以全程调速柴油发动机与带闭锁离合器的三元件向心涡轮液力变矩器为研究对象,以实现动力传动系统虚拟样机建模仿真为目标,基于ADAMS建立了发动机、液力变矩器和闭锁离合器数学模型,并组装成共同工作虚拟样机,提供了模型实现方法.通过编写仿真剧本实现仿真过程控制,得出发动机与液力变矩器共同工作时的动态特性.仿真结果表明,所建立的虚拟样机模型可用于后续的动力传动系统总体虚拟样机建模仿真.     

基于虚拟样机的胶印机虚拟试验及串墨初始相位优化

针对胶印机结构复杂的特点,提出基于虚拟试验获得胶印机整机性能数据的方法.以SolidWorks,COSMOS/Motion和ADAMS为虚拟样机建模平台,构建了某型胶印机印刷色组的虚拟样机模型.在ADAMS中对胶印机虚拟样机进行虚拟试验,获得了胶印机整机的静力学、运动学和动力学仿真数据.通过对虚拟试验数据的分析,明确了...     

门式起重机司机培训的Java3D建模与控制

介绍门式起重机司机培训系统的组成。重点描述一般的JaVa3D程序的编程框架，给出实现门式起重机三维演示的核心代码。按照几何方法建立虚拟门吊场景，实现了虚拟门式起重机司机培训原型系统的主要功能，并给出了该系统实现的环境和运行界面？     

基于虚拟样机技术的机械臂建模与仿真

应用机械系统动力学仿真分析软件MSC．ADAMS，建立了机械臂抓取的虚拟样机模型，包括对机械臂各部件的简化、在ADAMS中的模型描述及仿真过程控制。在仿真过程中通过预估末端件的运动规律，依据运动仿真结果求得控制主动件的运动输入曲线。最后对该虚拟样机模型进行了运动学和动力学分析，实现了使用CAE仿真软件来对机械臂的运动和动力性能进行分析，为机械臂系统的设计、制造和模拟运动作业提供了理论依据和主要参数，为工程设计提供了一套有效的分析方法。     

步行训练机器人虚拟样机协同仿真方法研究

研究SolidWorks、ADAMS和MATLAB协同仿真方法,建立步行训练机器人虚拟样机三维实验平台,实现对步行训练的动态特性和控制系统的仿真验证,其结果证明虚拟样机协同仿真的方法确切有效地分析步行训练机器人运动特性,为研发步行机器人的物理样机提供主要参考.     

关于起重机在特殊危险工况下的安全性能分析

该文结合起重机的实际使用特点,分析在特种危险工况条件下产生事故的多种原因,利用虚拟样机动力学分析以及有限元的数值模拟的应力分析方法,探讨了六种不同特殊危险工况下的门式起重机的安全性能,希望对于今后门式起重机的设计和使用具有一定帮助。     

牛头刨床六杆机构的多体动力学分析及优化设计

简要介绍多体系统动力学的原理及多体系统动力学计算的积分方法，利用动力学仿真软件ADAMS，对牛头刨床的六杆机构进行分析，并通过虚拟样机技术，对牛头刨床加速度和压力角进行了优化设计．为实际的机构设计提供依据，也为虚拟样机技术的学习提供了实例．     

基于ADAMS集装箱起重机拉杆系统动力学仿真

为研究在起升、小车运行机构联合启动、平稳运行和制动等复杂工况下的拉杆系统断裂情况,对岸边集装箱起重机拉杆系统采用虚拟样机模型进行刚体动力学和刚柔耦合体动力学仿真,并对仿真后的曲线数据结果进行合理有效的分析,研究结果为解决岸边集装箱起重机拉杆断裂问题提供了参考数据。     

Solidworks与ADAMS联合对吊物超载的仿真试验研究

在Solidworks软件中建立吊物的CAD模型,将该模型转入ADAMS平台,在ADAMS中建立虚拟样机模型,对吊物进行超载仿真试验,分析仿真试验结果,得到吊物准确的动态特性,分析仿真试验结果,确保龙门起重机的安全使用.     

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.     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-