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61.
树脂基复合材料在激光辐照下通常会发生复杂的物理化学变化,可能涉及材料热分解、烧蚀、汽化和比较复杂的界面问题。鉴于无网格粒子法在处理大变形、网格畸变和材料烧蚀等问题时有优势,利用改进的光滑粒子方法对激光辐照下复合材料树脂基热解时的三维温度场模型进行数值求解。将数值模拟结果与实验结果进行对比,考察了改进的光滑粒子方法对所考虑问题的适用性。结果表明:改进的光滑粒子方法适合于模拟激光对树脂基复合材料的辐照效应,在激光与物质相互作用领域,该方法也是值得关注的一种数值方法。 相似文献
62.
Geometric surface mesh optimization 总被引:4,自引:0,他引:4
This paper presents a surface mesh optimization method suitable to obtain a geometric finite element mesh, given an initial
arbitrary surface triangulation. The first step consists of constructing a geometric support, continuous, associated with the initial surface triangulation, which represents an adequate approximation of the underlying
surface geometry. The initial triangulation is then optimized with respect to this geometry as well as to the element shape
quality. A specific application of this technique to the geometric mesh simplification is then outlined, which aims at reducing
the number of mesh entities while preserving the geometric approximation of the surface. Several examples of surface meshes
intended for different application areas emphasize the efficiency of the proposed approach.
Received: 11 September 1997 / Accepted: 19 February 1998 相似文献
63.
Alexandra A. Zobova Timothée Habra Nicolas Van der Noot Houman Dallali Nikolaos G. Tsagarakis Paul Fisette Renaud Ronsse 《Multibody System Dynamics》2017,39(1-2):95-114
We present a multibody simulator being used for compliant humanoid robot modelling and report our reasoning for choosing the settings of the simulator’s key features. First, we provide a study on how the numerical integration speed and accuracy depend on the coordinate representation of the multibody system. This choice is particularly critical for mechanisms with long serial chains (e.g. legs and arms). Our second contribution is a full electromechanical model of the inner dynamics of the compliant actuators embedded in the COMAN robot, since joints’ compliance is needed for the robot safety and energy efficiency. Third, we discuss the different approaches for modelling contacts and selecting an appropriate contact library. The recommended solution is to couple our simulator with an open-source contact library offering both accurate and fast contact modelling. The simulator performances are assessed by two different tasks involving contacts: a bimanual manipulation task and a squatting tasks. The former shows reliability of the simulator. For the latter, we report a comparison between the robot behaviour as predicted by our simulation environment, and the real one. 相似文献
64.
Houman Modarres 《电信科学》2000,16(1):59-60
1概述目前,业内人士普遍认识到,统一网络能够简化企业运营,提高向市场提供增强型新业务的能力,并且为此已经做了大量工作,包括将所有的网络流量从已经拥有一个世纪的悠久历史并且遍布全球的交换式公用电话网络转移到同样已经是十分普及的并且效率很高的基于数据包的网络?.. 相似文献
65.
This paper concerns the simplification of composite parametric surface meshes which conform to the boundary of each constituting patch. The goal is to eliminate the small edges which result from this boundary patch preserving constraint, provided that these small edges belong to an almost flat area. To this end, two tolerance areas with respect to the initial reference mesh are introduced to keep close to the surface. The reference mesh is then simplified and optimized (in terms of shape quality) so that the resulting mesh belongs to these tolerance areas. Several examples of surface meshes are provided in order to assess the efficiency of the simplification method. 相似文献
66.
Houman Honaryar Saba Amirfattahi Zahra Niroobakhsh 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(16):2206524
Shaping soft materials into prescribed 3D complex designs has been challenging yet feasible using various 3D printing technologies. For a broader range of soft matters to be printable, liquid-in-liquid 3D printing techniques have emerged in which an ink phase is printed into 3D constructs within a bath. Most of the attention in this field has been focused on using a support bath with favorable rheology (i.e., shear-thinning behavior) which limits the selection of materials, impeding the broad application of such techniques. However, a growing body of work has begun to leverage the interaction or association of the two involved phases (specifically at the liquid–liquid interface) to fabricate complex constructs from a myriad of soft materials with practical structural, mechanical, optical, magnetic, and communicative properties. This review article has provided an overview of the studies on such associative liquid-in-liquid 3D printing techniques along with their fundamentals, underlying mechanisms, various characterization techniques used for ensuring the structural stability, and practical properties of prints. Also, the future paths with the potential applications are discussed. 相似文献
67.
Houman Darvish Hamid Garmsiri Mohsen Zare Nassim Hemmati 《Petroleum Science and Technology》2018,36(4):308-312
In the recent years, declination of oil reservoir causes the importance of researches on enhancement of oil recovery processes become more important. One of wide applicable approaches in enhancement of oil recovery is carbon dioxide injection which becomes interested because of relative low cost, good displacement and environmentally aspects. The injection of carbon dioxide to oil reservoir causes the lighter hydrocarbons of crude oil are extracted by CO2. This phenomena can be affected by various factors such the solubility of hydrocarbons in carbon dioxide so in the present investigation Fuzzy c-means (FCM) as a novel approach for estimation of solubility of alkanes in carbon dioxide in terms of temperature, pressure and carbon number of alkane were utilized. The predicting algorithm FCM has reliable ability to estimate solubility based on graphical and statistical results. The coefficient of determination (R2) for training and testing data are calculated as 0.9856 and 0.9529 respectively. 相似文献
68.
Houman Darvish Hamed Raji Asadabadi Ashkan Maleki Sadeghi karim Rouhibakhsh 《Petroleum Science and Technology》2018,36(9-10):660-665
Nowadays the importance of enhanced oil recovery (EOR) processes increases because of increasing demand of energy and declination of oil reservoirs. Due to this fact the researchers attracted to study performance of EOR methods. one of the high efficient methods is carbon dioxide injection which is favorable because of low cost and environmental friendly viewpoints. One of important parameters which have straight effect on recovery of injection is interfacial tension between carbon dioxide and hydrocarbons. In the present investigation the main objective is proposing the Grid partitioning based Fuzzy inference system method as novel approach to predict interfacial tension of carbon dioxide and hydrocarbon in terms of temperature, pressure, liquid and gas densities and molecular weight of alkane. The coefficients of determination for different datasets of training and testing of estimating algorithm are determined as 0.9919 and 0.9899. This results express the algorithm has potential of estimating interfacial tension of hydrocarbons and carbon dioxide. 相似文献
69.
One of the problematic concerns in petroleum industries is the deposition of heavy fractions of crude oil such as asphaltene fraction during production and transportation. The utilization of inhibitors is known as a relative low cost and effective method for asphaltene inhibition. In this study, Radial basis function artificial neural network (RBF-ANN) was applied to predict asphaltene precipitation reduction in terms of structure and concentration of inhibitor and oil properties. In order to training and testing of RBF-ANN the required data are extracted from reliable sources. The predicted asphaltene precipitation reduction values were compared with the actual data statistically and graphically. The coefficients of determination for training and testing phases of RBF-ANN were determined as 0.995906 and 0.994853 respectively. These evaluations showed that the RBF-ANN as a predictive tool has great capacity to estimate effect of asphaltene inhibitors on reduction of asphaltene precipitation. 相似文献