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Study on FEM simulation algorithm of Local Warm Forming of Advanced High-Strength Steel

MATERIALS 2025年第9期18卷 1900-1900页

作者： Wang, Tao Li, Di Wang, Xiao-Kun Zhu, Hong-Pai Liu, Jun-Jie Jiang, Ning Feng, Xiao-Zhi Liu, Shao-Xun Shandong Univ Technol Sch Transportat & Vehicle Engn Zibo 255000 Peoples R China Rongcheng Compaks New Energy Automobile Co Ltd Rongcheng 264300 Peoples R China

Advanced high-strength steels (AHSSs) are prone to process defects such as fracture and springback during forming operations. Local warm forming technology represents an innovative forming process that applies targeted heating to specific stamping features of high-strength steel blanks. This study focuses on dual-phase steel DP780 as the research material, obtaining mechanical property parameters at various temperatures through uniaxial tensile tests. Based on investigations into temperature-dependent constitutive models and heat-transfer analysis methods, Abaqus VUMAT and UMAT subroutines were developed using Fortran language to establish a local warm forming simulation algorithm that incorporates predictions of fracture failure and springback. A U-shaped component was designed for local warm forming bend-stretch tests, with experimental data compared against results from the developed algorithm. This validation confirmed the algorithm's capability to accurately predict local warm forming behaviors of U-shaped components. Leveraging the validated algorithm, sensitivity analyses were conducted to examine the influence of local warm forming process parameters on springback, with the response surface methodology employed to quantitatively assess the effects of heating temperature and localized heating zones on springback characteristics.

关键词： local warm forming advanced high strength steel simulation algorithm fracture springback

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A simulation algorithm FOR COMPUTING FAILURE PROBABILITY OF A CONSECUTIVE-K-OUT-OF-R-FROM-N-F SYSTEM

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IEEE TRANSACTIONS ON RELIABILITY 1995年第3期44卷 523-531页

作者： PSILLAKIS, ZM University of Patras Patras Greece

An efficient simulation algorithm for computing failure probability of a consecutive-k-out-of-r-from-n:F system (linear or circular) with any component reliability, is presented. The algorithm estimates both the failure probability of the system and the associated uncertainty (error). A complete interpretation of the algorithm results is given through a detailed error analysis.

关键词： CONSECUTIVE-K-OUT-OF-R-FROM-N-F SYSTEM FAILURE PROBABILITY simulation algorithm

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simulation algorithm of carrier transport subject to Lorentz force in semiconductor films

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SOLID-STATE ELECTRONICS 2011年第1期63卷 137-139页

作者： Kimura, Mutsumi Hirako, Masaaki Yamaoka, Toshifumi Tani, Satoshi Ryukoku Univ Dept Elect & Informat Otsu Shiga 5202194 Japan Ryukoku Univ Joint Res Ctr Sci & Technol Otsu Shiga 5202194 Japan High Tech Res Ctr Innovat Mat & Proc Res Ctr Otsu Shiga 5202194 Japan

We have developed a simulation algorithm of carrier transport subject to Lorentz force in semiconductor films. The Lorentz current is discretized with the drift and diffusion currents, and the simulation algorithm is implemented in finite difference methods. Hall effect around a grain boundary in a polycrystalline semiconductor film is evaluated as a simulation example, and it is found that a high Hall voltage is generated at the grain boundary. (C) 2011 Elsevier Ltd. All rights reserved.

关键词： simulation algorithm Carrier transport Lorentz force Semiconductor film Hall effect Grain boundary Polycrystalline semiconductor

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simulation algorithm for piston ring dynamics

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simulation MODELLING PRACTICE AND THEORY 2008年第1期16卷 127-146页

作者： Wannatong, Krisada Chanchaona, Somchai Sanitjai, Surachai PTT Publ Co Ltd Bangkok 10900 Thailand King Mongkuts Univ Technol Dept Mech Engn Bangkok 10140 Thailand

Piston ring dynamics play important roles on the lubricant characteristic of reciprocating engines which lead to the consequences of engine wear and vast amount of lubricating oil consumption. Due to the complexity of motion, a study of motions and effects of the piston ring is mostly conducted in a simulation program. This paper shows a theoretical work and a new simulation algorithm of the 3D piston ring motions. The simulation concept is to determine the positions of the piston ring, which are the solutions of the Newton and Euler equations. Well known models like mixed lubrication model, asperity contact model, and blow-by/blow-back flow model were used in this study. The new simulation algorithm consists of four processes: construction of calculation nodes, use of finite different method, determination of the non-linear equation system, use of parallel computational technique. Two sets of the experimental studies were conducted for simulation verification. First, the gas flows through the static rectangular piston ring pack. Second, the blow-by/blow-back gas flow through the piston ring pack of a single cylinder diesel engine. The good agreement between the experimental and simulation results indicates that the developed simulation program can illustrate the piston ring motions and blow-by/blow-back flow. Since there is no algebraic equation in the ring profile, the presented simulation technique is suitable for the complicated surface of the piston and piston rings. (c) 2007 Elsevier B.V. All rights reserved.

关键词： finite difference simulation algorithm piston ring dynamics lubrication blow-by/blow-back flow

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Saving Space in a Time Efficient simulation algorithm

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FUNDAMENTA INFORMATICAE 2011年第1-2期108卷 23-42页

作者： Crafa, Silvia Ranzato, Francesco Tapparo, Francesco Univ Padua Dipartimento Matemat Pura & Applicata I-35121 Padua Italy

A number of algorithms for computing the simulation preorder on Kripke structures and on labelled transition systems are available. Among them, the algorithm by Rnzato and Tap-paro [2007] has the best time complexity, while the algorithm by Gentilini et al. [2003] - successively corrected by van Glabbeek and Ploeger [2008] - has the best space complexity. Both space and time complexities are critical issues in a simulation algorithm, in particular memory requirements are crucial in the context of model checking when dealing with large state spaces. Here, we propose a new simulation algorithm that is obtained as a space saving modification of the time efficient algorithm by Ranzato and Tapparo: a symbolic representation of sets is embedded in this algorithm so that any set of states manipulated by the algorithm can be efficiently stored as a set of blocks of a suitable state partition. It turns out that this novel simulation algorithm has a space complexity comparable with Gentilini et al.'s algorithm while improving on Gentilini et al.'s time bound.

关键词： simulation preorder simulation algorithm coarsest partition problem

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A retrodictive stochastic simulation algorithm

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JOURNAL OF COMPUTATIONAL PHYSICS 2010年第10期229卷 3777-3791页

作者： Vaughan, T. G. Drummond, P. D. Drummond, A. J. Swinburne Univ Technol Ctr Atom Opt & Ultrafast Spect Melbourne Vic 3122 Australia Univ Auckland Dept Comp Sci Auckland 1142 New Zealand

In this paper we describe a simple method for inferring the initial states of systems evolving stochastically according to master equations, given knowledge of the final states This is achieved through the use of a retrodictive stochastic simulation algorithm which complements the usual predictive stochastic simulation approach We demonstrate the utility of this new algorithm by applying it to example problems. including the derivation of likely ancestral states of a gene sequence given a Markovian model of genetic mutation (C) 2010 Elsevier Inc. All rights reserved

关键词： Stochastic process simulation algorithm Retrodiction Genetics

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Research on double-rotor dynamic grinding model and simulation algorithm for crankshaft main journal

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INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2021年第11-12期114卷 3391-3400页

作者： Zeng, Xu Xiong, Wanli Sun, Wenbiao Ye, Hongyan Tang, Zhiyong Hunan Univ Sch Mech & Transportat Engn Changsha 410082 Hunan Peoples R China Neijiang Jinhong Crankshaft Co Ltd Neijiang 641000 Peoples R China

Crankshaft is a core part of automobile engine to bear impact load and transmit power. Precision grinding is the most important machining method to achieve high precision of crankshaft main journal. Although many scholars have established various simulation models in the field of cylindrical grinding, it is difficult to carry out effective quantitative simulation for a given crankshaft main journal grinding system. Aiming at the shortcomings of the existing models, a double-rotor dynamic model is proposed, which considers the interaction between the grinding wheel and the main journal, and iterative algorithm is adopted to simulate material removal and roundness change in the grinding process of the main journal. The normal force between grinding wheel and the main journal is defined in detail in the algorithm, which is closer to the actual grinding process. For a given crankshaft grinding system, different grinding strategies of the main journal are quantitatively simulated by using the model. The proposed model and algorithm are validated by experiments, which can provide a basic model for the further study of the crankshaft cylindrical grinding system.

关键词： Double-rotor dynamic model Crankshaft main journal grinding Rounding process simulation algorithm

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Study on the stability and its simulation algorithm of a nonlinear impulsive ABC-fractional coupled system with a Laplacian operator via F-contractive mapping

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ADVANCES IN CONTINUOUS AND DISCRETE MODELS 2024年第1期2024卷 5页

作者： Zhao, Kaihong Taizhou Univ Sch Elect & Informat Engn Dept Math Taizhou 318000 Zhejiang Peoples R China

In this paper, we study the solvability and generalized Ulam-Hyers (UH) stability of a nonlinear Atangana-Baleanu-Caputo (ABC) fractional coupled system with a Laplacian operator and impulses. First, this system becomes a nonimpulsive system by applying an appropriate transformation. Secondly, the existence and uniqueness of the solution are obtained by an F-contractive operator and a fixed-point theorem on metric space. Simultaneously, the generalized UH-stability is established based on nonlinear analysis methods. Thirdly, a novel numerical simulation algorithm is provided. Finally, an example is used to illustrate the correctness and availability of the main results. Our study is a beneficial exploration of the dynamic properties of viscoelastic turbulence problems.

关键词： Coupled ABC-fractional system Laplacian operator Solvability and stability F-contractive mapping simulation algorithm

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Validation of a simulation algorithm for Safety-Critical Human Multitasking 3rd

Validation of a Simulation Algorithm for Safety-Critical Hum...

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3rd World Congress on Formal Methods (FM)

作者： Broccia, Giovanna Milazzo, Paolo Belviso, Cristina Montiel, Carmen Berrocal Univ Pisa Dept Comp Sci Pisa Italy Univ Pisa Dipartimento Patol Chirurg Med Mol & Area Crit Pisa Italy

ISBN: (纸本)9783030549930;9783030549947

Multitasking has become surprisingly present in our life. This is mostly due to the fact that nowadays most of our activities involve the interaction with one or more devices. In such a context the brain mechanism of selective attention plays a key role in determining the success of a human's interaction with a device. Indeed, it is a resource to be shared among the concurrent tasks to be performed, and the sharing of attention turns out to be a process similar to process scheduling in operating systems. In order to study human multitasking situations in which a user interacts with more than one device at the same time, we proposed in a previous work an algorithm for simulating human selective attention. Our algorithm focuses, in particular, on safety-critical human multitasking, namely situations in which some of the tasks the user is involved in may lead to dangerous consequences if not executed properly. In this paper, we present the validation of such an algorithm against data gathered from an experimental study performed with real users involved concurrently in a "main" task perceived as safety-critical and in a series of "distractor" tasks having different levels of cognitive load.

关键词： Validation simulation algorithm Human-computer interaction Safety-critical Multitasking Experimental study

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An accurate simulation algorithm for focus variation microscopy 6

An accurate simulation algorithm for focus variation microsc...

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6th International Conference on Optical and Photonic Engineering (icOPEN)

作者： Cui, Haihua Wei, Hao Cheng, Xiaosheng Bian, Xinguang Dai, Ning Nanjing Univ Aeronaut & Astronaut Coll Mech & Elect Engn Nanjing 210016 Jiangsu Peoples R China

ISBN: (纸本)9781510622579

The focus variation microscopy is widely used and researched in both industrial and academic field. But the 3D construction quality of surface topography is affected by the noise, the double peak value, and the discontinuous surface, and so on. A simulation method for focus variation is proposed based on the physical model of optical imaging and the Point Spread Model(PSF). At first, the linear relationship between the blur factor sigma of Gaussian function and the defocus distance delta is deduced which is called point spread parameter lambda, then, considering the positive correlation between blur factor sigma and blur degree, the difference between the real defocused image and the calculated image by Gaussian convolution operation to real captured focused image is shown. It is used to the objective to computed the accurate value sigma and the spread parameter lambda. At last, the difference between focus measure valued of real image sequence and simulation image sequence is used to verify the method. The simulation method is a judgement basis for focus measurement, the single peak of focus curve, and the identification of high-frequency noise.

关键词： Surface topography simulation algorithm focus variation automatic measurement

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