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Simple qualitative dynein model in Nose-Hoover framework Nose-Hoover框架下的简单定性动力模型
Q4 Chemical Engineering Pub Date : 2022-01-01 DOI: 10.24132/acm.2022.688
J. Rosenberg, M. Krejčová
The presented paper is devoted to studying the dynein molecular motor and its stochastic description. The model aims to obtain good results comparable to literature sources qualitatively. We choose the Hoover-Holian oscillator to describe the dynein behaviour of each of its legs. It can catch the stochastic movement produced by Brownian motion and can be modified to simulate a load.
本文主要研究动力蛋白分子马达及其随机描述。该模型旨在定性地获得与文献来源相当的良好结果。我们选择胡佛-霍利安振荡器来描述它每条腿的动力行为。它可以捕捉布朗运动产生的随机运动,并可以修改以模拟负载。
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引用次数: 0
Numerical modal analysis of DTU 10-MW reference wind turbine’s blade using modified Myklestad´s method 采用改进的Myklestad方法对DTU 10mw参考风力机叶片进行数值模态分析
Q4 Chemical Engineering Pub Date : 2022-01-01 DOI: 10.24132/acm.2022.728
Lucas Meirelles Pereira, Marco Tulio Santana Alves
Since the rotor blade system of an horizontal axis wind turbine is responsible for converting wind energy into mechanical, which turns into electrical and predicting its dynamic behavior is of vital importance. In that sense, this paper deals with performing a modal analysis of a blade belonging to the DTU 10-MW reference wind turbine by using a modified Myklestad’s method. The blade model was built on two different keystones, as follows: first, considering uncoupled bending in out-of-plane (flapwise) and in-plane (edgewise) directions and considering a coupled bending-torsion motion also in both directions. In order to accomplish these objectives, a Python code was implemented. The computed eigenfrequencies were compared to the results obtained for the blade by using the finite element method. Besides, the mode shapes were plotted and the centrifugal stiffening was also taken into account. Results suggest the feasibility of the modified Myklestad’s method for modal analysis purposes, since good agreement with reference data was achieved and considering that the Myklestad’s method has a considerably less complex implementation than the finite element method.
由于水平轴风力机的转子叶片系统负责将风能转化为机械能,进而转化为电能,因此预测其动态特性至关重要。因此,本文采用改进的Myklestad方法对DTU 10mw参考风力机叶片进行了模态分析。在两个不同的关键节点上建立叶片模型,首先考虑面外(扑翼)和面内(沿翼)方向的不耦合弯曲,同时考虑两个方向的弯曲-扭转耦合运动。为了实现这些目标,实现了一个Python代码。将计算得到的特征频率与用有限元法计算得到的叶片特征频率进行了比较。此外,还绘制了振型图,并考虑了离心加筋的影响。结果表明,改进的Myklestad方法用于模态分析的可行性,因为与参考数据达成了良好的一致性,并且考虑到Myklestad方法的实现比有限元方法要简单得多。
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引用次数: 0
The Analytical and Numerical Stress Analysis of Various Domes for Composite Pressure Vessels 复合材料压力容器各种圆顶的应力分析与数值分析
Q4 Chemical Engineering Pub Date : 2022-01-01 DOI: 10.24132/acm.2022.781
Z. Padovec, D. Vondráček, T. Mareš
The paper describes analytical and numerical solutions for five selected domes (a spherical shell, a geodesicisotensoid shell, a shell with zero transversal strain, a shell with zero transversal stress, and a shell with identical strain) for composite pressure vessels manufactured by means of filament (helical) winding. The stresses and strains in the domes were evaluated analytically from known equations with the use of MATLAB script for numerical evaluation and via finite element analysis (FEA) with Abaqus software and results were compared with each other. Two failure criteria, interactive and non-interactive, were chosen for the evaluation of critical areas of the shells. Moreover, the best dome shape for a given material and polar hole/equator ratio was selected for various types of failure, i.e., a loss of tightness/leakage or the failure of the fibers.
本文给出了用丝(螺旋)缠绕法制造复合材料压力容器的五种壳体(球形壳体、测地等张力壳体、零横向应变壳体、零横向应力壳体和相同应变壳体)的解析解和数值解。利用MATLAB脚本对已知方程进行数值计算,并用Abaqus软件进行有限元分析,并对计算结果进行对比分析。选择了交互和非交互两种失效准则来评估壳的关键区域。此外,对于给定的材料和极性孔/赤道比,对于各种类型的破坏,即密封性损失/泄漏或纤维的破坏,选择了最佳的圆顶形状。
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引用次数: 2
Fracture behavior of prestressed ductile target subjected to high velocity impact - Numerical study 高速冲击下预应力延性靶的断裂行为-数值研究
Q4 Chemical Engineering Pub Date : 2022-01-01 DOI: 10.24132/acm.2022.779
Yogeshwar Jasra, R. Saxena
Impact studies are performed to evaluate the ballistic performance of material subjected to a high strain rate. At high velocities, the projectile penetrates through the material which leads to a fracture of the target body. The fracture behavior depends upon the condition of the target body. It is anticipated that the fracture behavior should depend upon the prestress condition of the target. Considering the aforementioned concern, the thermo-elastic-plastic finite element model is formulated using MSC Marc Mentat to analyze the effect of the prestress condition of the target body on fracture behavior. A detailed comparison has been presented considering four different prestress states subjected to impact by a blunt-shaped projectile. The continuum damage mechanics using a stress triaxiality-based damage model is used to simulate damage evolution and fracture. It is found that the presence of prestress alters the overall fracture response of the structure subjected to high strain rate deformation. In the presence of tensile prestress, the material resists the accumulation of damage which is due to the lower values of stress triaxiality and equivalent plastic strain. It is also found that the presence of tensile prestress inside the target body increases the ballistic performance, whereas the presence of compressive prestress inside the target body degrades the performance.
进行冲击研究是为了评估材料在高应变率下的弹道性能。在高速下,弹丸穿透材料,导致靶体断裂。断裂行为取决于靶体的状态。预计断裂行为应取决于目标的预应力条件。考虑到上述问题,利用MSC Marc Mentat建立了热弹塑性有限元模型,分析了靶体预应力条件对断裂行为的影响。考虑钝形弹丸冲击下的四种不同预应力状态,进行了详细的比较。采用基于应力三轴性的损伤模型,采用连续损伤力学方法模拟损伤演化和断裂过程。研究发现,预应力的存在改变了结构在高应变率变形下的整体断裂响应。在拉伸预应力存在的情况下,由于应力三轴性和等效塑性应变值较低,材料可以抵抗损伤的累积。研究还发现,靶体内存在拉预应力可提高靶体的弹道性能,而靶体内存在压预应力则会降低靶体的弹道性能。
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引用次数: 0
Numerical Investigation of Enhanced Oil Recovery from various Rocks by Nanosuspensions Flooding 纳米悬浮驱提高不同岩石采收率的数值研究
Q4 Chemical Engineering Pub Date : 2022-01-01 DOI: 10.22055/JACM.2021.38217.3182
D. Guzei, A. Minakov, M. Pryazhnikov, S. Ivanova
This work is devoted to the systematic numerical simulation of oil displacement using nanosuspension with silicon oxide particles with concentration of up to 1 wt% and particle sizes of 5 nm. The influence of such factors as core wettability, concentration of nanoparticles, capillary number, and oil viscosity on the enhanced oil recovery by nanosuspension has been systematically investigated using the VOF method for 2D-dimensional micromodels. Various rocks were considered: dolomite, metabasalt and sandstone. It is shown that the oil recovery coefficient improves for all considered types of rock with increasing nanoparticle concentration. The most effective application of nanosuspension for enhanced oil recovery is observed at a low capillary number, corresponding to the capillary displacement mode. The addition of nanoparticles facilitates increasing oil recovery factor in a wide range of viscosity ratios between oil and displacement fluid.
这项工作致力于使用浓度高达1wt %、粒径为5nm的氧化硅纳米悬浮液对驱油进行系统的数值模拟。采用二维微模型VOF方法系统研究了岩心润湿性、纳米颗粒浓度、毛细数、油粘度等因素对纳米悬浮液提高采收率的影响。考虑了各种岩石:白云岩、变质玄武岩和砂岩。结果表明,随着纳米颗粒浓度的增加,所有考虑的岩石类型的采收率系数都有所提高。在毛细管数较低的情况下,纳米悬浮液提高采收率的效果最好,这与毛细管位移模式相对应。纳米颗粒的加入有助于在油与驱替液粘度比较大的范围内提高采收率。
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引用次数: 1
On fatigue life predictions for notched members by the nominal stress-based and the local strain-based methods 基于名义应力和局部应变的缺口构件疲劳寿命预测方法研究
Q4 Chemical Engineering Pub Date : 2022-01-01 DOI: 10.24132/acm.2021.678
J. Duran
Traditional engineeringmodels for addressing fatigue issues are based on empirical relations between the necessary number of cycles for fatigue failures $N_f$ and either, the nominal stress $sigma_{an}$ or the local strain $epsilon_a$ amplitudes. The aim of the present paper is to highlight the advantages of the local strain-based approach $epsilon N$ for fatigue assessment of notched components over the more traditional stress-based approach $sigma N$. Since a closed form solution for the ratio between fatigue life predictions among the two methods does not exist, we have considered a hypothetical case study that included variables such as the applied stress, the stress concentration factor and the structural material, and numerically calculated the expected fatigue life according to each approach. In order to highlight the differences related with the stress-strain analysis, the applied nominal stresses (uniaxial) were limited to the elastic region where both methods use approximately the same fatigue strength curve. Additionally a unique and equal function for accounting for themean stress effects was incorporated in both approaches. Fatigue life predictions are expressed in universal graphs of normalized stress versus the $N_f-ratio$, the latter parameter defined as the quotient between the $N_f$ predictions according to the $sigma N$ and $epsilon N$ approaches, considering the average values for a group of sixty structural steels at each load level. The results confirm that fatigue life predictions under the traditional stress based approach are conservative when compared to the strain based approach for all the possible scenarios described by the variables involved.
解决疲劳问题的传统工程模型是基于疲劳失效所需的循环次数$N_f$与名义应力$sigma_{an}$或局部应变$epsilon_a$幅值之间的经验关系。本文的目的是强调基于局部应变的方法$epsilon N$对缺口部件进行疲劳评估的优势,而不是传统的基于应力的方法$sigma N$。由于两种方法之间的疲劳寿命预测之比的封闭形式解不存在,我们考虑了一个假设的案例研究,其中包括诸如施加应力,应力集中系数和结构材料等变量,并根据每种方法数值计算预期疲劳寿命。为了突出与应力-应变分析相关的差异,所施加的名义应力(单轴)被限制在弹性区域,其中两种方法使用近似相同的疲劳强度曲线。此外,在这两种方法中都采用了一个独特的、相等的函数来计算平均应力效应。疲劳寿命预测用归一化应力与$N_f-ratio$的通用图表示,后一个参数定义为根据$sigma N$和$epsilon N$方法的$N_f$预测之间的商,考虑到在每个荷载水平上一组60个结构钢的平均值。结果证实,在所有可能的情况下,与基于应变的方法相比,传统的基于应力的方法对疲劳寿命的预测是保守的。
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引用次数: 0
Validation of two-fluid model for water hammer in elastic pipes 弹性管道水锤双流体模型的验证
Q4 Chemical Engineering Pub Date : 2022-01-01 DOI: 10.24132/acm.2022.765
Mohamed Ouzi, Mohamed Tamani, H. Samri, B. Bahrar
In this article, the two-phase water hammer theoretical and numerical simulation are provided. A mathematical formulation is presented to describe the transient one-dimensional flow of bubbly gas-liquid mixtures without phase change in an horizontal pipe. The features of the two-fluid model for simulating water hammer flows are investigated. The governing equations were obtained from mass and momentum conservation laws combined with interfacial interaction correlations. The obtained system of equations for steady-state is solved through the Runge-Kutta method. On the other hand, the transient flow equation solutions are provided by the Newton-Raphson methods. A laborious calculation was carried out to determine the common pressure of the two phases. In order to improve the robustness and efficiency of the Richtmeyer-Lax-Wendroff method in solving the two-fluid model, a flux corrected transport technique was proposed. The results obtained by the proposed model are compared successfully to the corresponding homogeneous equilibrium model and the experimental ones provided by the literature.
本文对两相水锤进行了理论和数值模拟。提出了一种描述无相变气泡气液混合物在水平管内一维瞬态流动的数学公式。研究了模拟水锤流的双流体模型的特点。控制方程由质量和动量守恒定律结合界面相互作用关系得到。用龙格-库塔法求解得到的稳态方程组。另一方面,用牛顿-拉夫森方法给出了瞬态流动方程的解。为了确定两相的共同压力,进行了艰苦的计算。为了提高Richtmeyer-Lax-Wendroff法求解双流体模型的鲁棒性和效率,提出了一种通量修正输运技术。该模型的计算结果与相应的均匀平衡模型和文献中的实验结果进行了比较。
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引用次数: 0
From A.Tondl's Dutch contacts to Neimark-Sacker-bifurcation 从A.Tondl的荷兰联系人到neimmark - sacker分岔
Q4 Chemical Engineering Pub Date : 2022-01-01 DOI: 10.24132/acm.2022.770
T. Bakri, F. Verhulst
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引用次数: 2
Dynamic Response of a Step Loaded Cubic Cavity Embedded in a Partially Saturated Poroelastic Half-Space by the Boundary Element Method 用边界元法研究嵌在部分饱和孔弹性半空间中的阶跃加载立方体空腔的动力响应
Q4 Chemical Engineering Pub Date : 2021-11-16 DOI: 10.22055/JACM.2021.38487.3240
A. Petrov, M. V. Grigoryev, L. Igumnov, A. Belov, V. Eremeyev
The boundary element method is used to analyze the problem of dynamic loading acting inside a cubic cavity located in a partially saturated poroelastic halfspace. Defining relations of a Biot’s porous medium are used, which are written in Laplace representations for unknown functions of displacements of the skeleton and pore pressures of the fillers. The boundary element methodology is based on using boundary integral equations of the direct approach. Solutions in time are obtained using the stepped method of numerical inversion of Laplace transforms. Dynamic responses of displacements and pore pressures at points on the surface of the halfspace and the cavity have been constructed. The effect of the values of the saturation coefficient and of the depth of the location of the cavity on dynamic responses has been studied.
采用边界元法分析了部分饱和孔隙弹性半空间中的立方体空腔内的动载荷问题。使用了Biot多孔介质的定义关系,这些关系用拉普拉斯表示法表示骨架的位移和填料的孔隙压力的未知函数。边界元方法是基于直接法的边界积分方程。使用拉普拉斯变换数值反演的阶梯方法获得时间上的解。构造了半空间和空腔表面各点的位移和孔隙压力的动态响应。研究了饱和系数和空腔位置深度对动力响应的影响。
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引用次数: 0
Pull-in Phenomenon in the Electrostatically Micro-switch Suspended between Two Conductive Plates using the Artificial Neural Network 用人工神经网络研究悬浮在导电板间的静电微动开关的拉入现象
Q4 Chemical Engineering Pub Date : 2021-11-11 DOI: 10.22055/JACM.2021.38569.3248
M. Aliasghary, Hamed Mobki, H. Ouakad
Artificial Neural Networks (ANN) are designed to evaluate the pull-in voltage of MEMS switches. The mathematical model of a micro-switch subjected to electrostatic force is preliminarily illustrated to get the relevant equations providing static deflection and pull-in voltage. Adopting the Step-by-Step Linearization Method together with a Galerkin-based reduced order model, numerical results in terms of pull-in voltage are obtained to be employed in the training process of ANN. Then, feed forward back propagation ANNs are designed and a learning process based on the Levenberg-Marquardt method is performed. The ability of designed neural networks to determine pull-in voltage have been compared with previous results presented in experimental and theoretical studies and it has been shown that the presented method has a good ability to approximate the threshold voltage of micro switch. Furthermore, the geometric and physical effect of the micro-switch on the pull-in voltage was also examined using these designed networks and relevant findings were provided.
设计了人工神经网络(ANN)来评估MEMS开关的拉入电压。初步建立了微动开关在静电力作用下的数学模型,得到了给定静偏转和拉入电压的相关方程。采用分步线性化方法,结合基于伽辽金的降阶模型,得到了与拉入电压有关的数值结果,并用于人工神经网络的训练过程。然后,设计前馈-反传播人工神经网络,并基于Levenberg-Marquardt方法进行学习。将所设计的神经网络确定拉入电压的能力与以往的实验和理论研究结果进行了比较,结果表明,所设计的神经网络具有较好的逼近微动开关阈值电压的能力。此外,还利用这些设计的网络检测了微开关对拉入电压的几何和物理影响,并提供了相关发现。
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引用次数: 5
期刊
Applied and Computational Mechanics
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