共查询到19条相似文献，搜索用时 468 毫秒
1.
探讨临时支撑卸载分析中的两种方法 总被引：1，自引：0，他引：1
目前在工程中,临时支撑卸载过程的分析和模拟主要有两种方法.利用这两种方法分别建立临时支撑卸载的有限元模型并在ANSYS中对这两个模型的卸载过程进行模拟和分析,从理论上和有限元分析结果上对这两种方法进行了探讨. 相似文献
2.
对山西省万家寨引黄入晋工程总干线7号隧洞开挖和蓄水运行的几种工况进行了非线性有限元分析．主要内容包括采用分级堆填过程模拟风积黄土层的初始应力场；应用：Duncan释放荷载思想和弹性理论面力公式进行开挖卸荷计算；采用Goodman节理单元模拟衬砌管片的接缝；应用Terzaghi松动土压力理论施加管片上压力；确定土的Duncan-Chang模型参数时，分别取原状土进行了卸载和加载试验，并比较了用2种试验获得的模型参数进行有限元变形分析的结果，多种工况的有限元分析得到了一些合理的结果． 相似文献
3.
4.
李云霞 《昆明师范高等专科学校学报》2009,31(6):92-93,96
根据薄板轧制中出现的大变形、大位移兼有弹性变形的特点,选用弹塑性有限元法对该过程进行分析,建立薄板冷轧的有限元模型,并在LS—DYNA软件平台上进行有限元分析求解,对轧制全过程进行模拟仿真,得到轧制过程的应力、应变模型．由轧制过程的模拟仿真结果分析,可获得最优的轧制条件,从而更精确的进行质量控制． 相似文献
5.
采用有限元软件MSC．Superform对角钢热连轧过程进行有限元模拟。介绍了模拟过程中的模型建立、材料参数、边界条件以及载荷的定义,分析了轧制过程中轧件温度场的分布和变化过程,分析结果对制定角钢热连轧过程的温度制度提供了有效参考。 相似文献
6.
《石家庄铁路职业技术学院学报》2015,(1)
以跨津秦客专跨径80.6+128+80.6m的连续梁临时支墩设计为例,对连续梁临时支墩的计算过程进行了详细的阐述,并通过有限元软件Midas对京津城际延伸线跨津秦客专特大桥的临时支墩进行了数值分析,结合施工现场的实际情况,说明有限元数值模拟方法满足施工现场要求。 相似文献
7.
薄板冲压成形仿真有限元数值模拟 总被引：1，自引：0，他引：1
本运用计算机仿真软件包SHEET－FORMING对复杂薄板零件波纹成形过程进行数值模拟。本认为，运用高压橡皮成形工艺成形波纹板零件是可行的，预示了加载成形中毛坯变形过程和卸载回弹中成形件的回弹状态，为有限元数值模拟技术在高压橡皮成形工艺中的应用积累了有用数据。本所做的研究对实际生产具有指导作用。 相似文献
8.
超长钻孔灌注群桩承载特性的实验研究和数值分析 总被引：1，自引：0，他引：1
采用离心机模型试验和三维有限元模型对天兴洲大桥的超长嵌岩钻孔灌注群桩进行了分析.离心机试验中,根据相似理论,不同的原型材料用不同的指标进行模拟,细砂、桩身、承台分别以天然密度、抗压刚度、抗弯刚度作为指标进行模拟.对土体未开挖阶段、钻孔阶段、混凝土灌注阶段和养护阶段的应力场进行了详细的讨论,并应用ANSYS进行了分析.根据2种方法得到的结果,从荷载沉降曲线、桩身轴力分布和侧向摩阻分布等方面,对比分析了加载和卸载条件下超长钻孔群桩的承载特性.结果表明,有限元计算模型与离心机试验模型沉降观测的结果吻合得很好;桩顶反力的分布规律复杂,与承台的自身刚度、相应的假定和分析方法有关;轴力随着深度先稍微增加,后逐渐减少,并且在岩层中减少的速度远比砂土中快. 相似文献
9.
10.
概述了二滩水电站地下厂房洞室群的超大规模的、模拟开挖过程的三维非线性有限元分析，以及分析中的一些全新的处理方法．据此，对地下洞室群三维非线性FEM分析中若干具有共性的问题提出了看法、讨论与建议，包括：在地应力丰方向与洞室轴线不平行时，地下洞室群进行三维非线性分析不可替代性；地应力场的获得与校核对得出合理计算结果的重要意义：有限元建模中数值误差与理论简化相适应，以保证计算的合理性与可行性；开挖步骤的模拟对非线性分析中发现破坏位置和破坏时间必要性等．此外，对部分计算结果进行简要的分析． 相似文献
11.
p-q和ip-iq两种谐波检测方法的仿真对比 总被引：2，自引：0，他引：2
针对基于瞬时无功功率理论的p-q和ip-iq两种谐波检测方法建立了仿真模型,并在电网电压有无畸变时进行了仿真和对比。结果表明,ip-iq法在电网电压有无畸变时均能从负载电流中准确地将谐波检测出来,而p-q法只在电网电压无畸变时,才能将负载电流中的基波分量和谐波分量有效地分离开。本研究为在谐波抑制中合理选取谐波检测方法提供了理论依据。 相似文献
12.
Some characteristics of the electricity load and prices are studied, and the relationship between electricity prices and gas (fuel) prices is analyzed in this paper. Because electricity prices are strongly dependent on load and gas prices, the authors constructed a model for electricity prices based on the effects of these two factors; and used the Geometric Mean Reversion Brownian Motion (GMRBM) model to describe the electricity load process, and a Geometric Brownian Motion(GBM) model to describe the gas prices; deduced the price stochastic process model based on the above load model and gas price model. This paper also presents methods for parameters estimation, and proposes some methods to solve the model. 相似文献
13.
INTRODUCTIONInanelectricitymarket,theelectricitypriceshaveimportantimpactonsuchdiverseis suesasassetpricing ,contracting ,planning ,andchoiceofoperationpoliciesforgenerationandtransmissionofelectricity .Analysisofthehistor icalelectricitypricessuggestedth… 相似文献
14.
15.
16.
Experimental research and numerical analysis were applied to study the ultimate load capacity(ULC) and reinforcement of circular-hollow-section N-joint.Four specimens were tested under static load.The ULC of each specimen was obtained and the detailed failure conditions were discussed.Based on the results, both welding a plate on the chord member and filling concrete in the chord member are effective to reinforce the N-joint, but it is suggested that these two methods should not be applied simultaneously.Mo... 相似文献
17.
With the development of computer simulation technique for room acoustics, diffuse reflection is considered more and more important.
In this paper, some models are developed by considering two diffuse factors in a room-diffuse reflection due to room surfaces
and scattering due to objects. The surface diffusion is treated by two different methods on the basis of probability analysis
or Energy Conservation Law, and the scattering among objects is simulated as a multiple random ray-tracing process. Thus the
sound pressure level distribution in a diffuse sound field can be calculated more precisely and easily. Agreement between
the computer simulation results and measurements shows the accuracy of the mathematical and physical model and the applicability
of the computer simulation methods. These models can be used in noise control engineering, as well as in the practice of acoustical
design. 相似文献
18.
ＩＮＴＲＯＤＵＣＴＩＯＮＷｉｔｈｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆｃｏｍｐｕｔｅｒｓｉｍｕｌａｔｉｏｎｔｅｃｈｎｉｑｕｅｆｏｒｒｏｏｍａｃｏｕｓｔｉｃｓ,ｎｅｗｍｏｄｅｌｓｈａｖｅｂｅｅｎｐｒｏｐｏｓｅｄｆｏｒｍｏｒｅｐｒｅｃｉｓｅｌｙｓｉｍｕｌａｔｉｎｇｓｏｕｎｄｆｉｅｌｄｓｔｏｒｅａｌｉｚｅａｕｒａｌｉｚａｔｉｏｎ .Ｔｈｅｃｏｍｐｕｔ ｅｒｈａｓｐｌａｙｅｄａｖｅｒｙｉｍｐｏｒｔａｎｔｒｏｌｅｉｎｔｈｅｒｅ ｓｅａｒｃｈｏｎｓｏｕｎｄｐｒｏｐａｇａｔｉｏｎ ,ｉｎｔｈｅｐｒｅｄｉｃｔｉｏｎｏｆｒｏ… 相似文献
19.
Karen Nylund-Gibson Ryan P. Grimm Katherine E. Masyn 《Structural equation modeling》2013,20(6):967-985
Including auxiliary variables such as antecedent and consequent variables in mixture models provides valuable insight in understanding the population heterogeneity embodied by a latent class variable. The model building process regarding how to include predictors/correlates and outcomes of the latent class variables into mixture models is an area of active research. As such, new methods of including these variables continue to emerge and best practices for the application of these methods in real data settings (including simple guidelines for choosing amongst them) are still not well established. This paper focuses on one type of auxiliary variable—distal outcomes—providing an overview of the methods currently available for estimating the effects of latent class membership on subsequent distal outcomes. We illustrate the recommended methods in the software packages Mplus and Latent Gold using a latent class model to capture population heterogeneity in students’ mathematics attitudes, linking latent class membership to two distal outcomes. 相似文献