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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 1-26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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The Dynamic simulation Model and the Comprehensive simulation algorithm of the Beam Pumping System

The Dynamic Simulation Model and the Comprehensive Simulatio...

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International Conference on Mechanical and Automation Engineering (MAEE)

作者： Dong, Shimin Cui, Yang Xing, Mingming Liao, Shensong Du, Liuxu Yanshan Univ Sch Mech Engn Qinhuangdao 066004 Peoples R China

ISBN: (纸本)9780769549750

The dynamic performance simulation of the beam pumping system is composed of two numerical simulation models. One numerical simulation model is built on the basis of the mathematical model to describe the crank movement, and the other is set up to describe the sucker rod longitudinal vibration. Taking into consideration the continuity conditions of beam pumping system, the comprehensive numerical simulation model for the system is established based on the mentioned above models. The comprehensive simulation algorithm is proposed, which is based on the numerical integration. The simulations reveal that good agreement is found between the experimentally obtained results and the simulations. The results between maximum and minimum polished rod loads of pumping unit appear to be accurate to within plus or minus 11%. In the same calculation environment, the simulation speed of the simulation software applying the comprehensive simulation algorithm is more than 10 times faster than those with the old algorithm. The improvement of the simulation speed establishes the foundation for combinatorial optimization of system dynamic parameters and energy consumption optimization of the system.

关键词： beam pumping systems system dynamics simulation model simulation algorithm the vibration of the sucker rod

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The simulation algorithm of Military Transportation Shortest Path Based on Petri Net

The Simulation Algorithm of Military Transportation Shortest...

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2nd ISECS International Colloquium on Computing, Communication, Control and Management (CCCM 2009)

作者： Liu Xuan Huang Shengguo Nanjing Univ Aeronaut & Astronaut Coll Civil Aviat Nanjing 210016 Peoples R China

ISBN: (纸本)9781424442461

The shortest transportation route is an important and basic problem in the military transportation. Currently, there are several methods developed to solve this problem, for example, the replace algorithm, Dijkstra algorithm, linear programming algorithm, etc.. This paper proposes a new method to the shortest route problem - simulation algorithm of Petri network. This method defines the operation rule and step of the simulation device of Petri net on the basis of general Petri network. It changes the undirectional transportation network into EPN model automatically with the simulation device of Petri net, while describes the elements of the network. Meanwhile, 'Place time' is used to replace the arc length to perform the simulation operation and numerical processing of the simulation target system of the network. It calculates the corresponding shortest route and length automatically. This method is more vivid, more intuitionistic and faster than the existing methods, it is a more practical method and means.

关键词： simulation algorithm military transportaion shortest path Petri net

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