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Meshless Local Discontinuous Petrov-Galerkin Method with Application to Blasting Problems

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Transactions of Tianjin University 2008年第5期14卷 376-383页

作者：强洪夫高巍然 Faculty of Mechanical and Propulsion Engineering Xi'an Hi-Tech Institute

A meshiess local discontinuous Petrov-Galerkin （MLDPG） method based on the local symmetric weak form （LSWF） is presented with the application to blasting problems. The derivation is similar to that of mesh-based Runge-Kutta Discontinuous Galerkin （RKDG） method. The solutions are reproduced in a set of overlapped spherical sub-domains, and the test functions are employed from a partition of unity of the local basis functions. There is no need of any traditional nonoverlapping mesh either for local approximation purpose or for Galerkin integration purpose in the presented method. The resulting MLDPG method is a meshless, stable, high-order accurate and highly parallelizable scheme which inherits both the advantages of RKDG and meshless method （MM）, and it can handle the problems with extremely complicated physics and geometries easily. Three numerical examples of the one-dimensional Sod shock-tube problem, the blast-wave problem and the Woodward-Colella interacting shock wave problem are given. All the numerical results are in good agreement with the closed solutions. The higher-order MLDPG schemes can reproduce more accurate solution than the lower-order schemes.

关键词： meshless method discontinuous Galerkin method meshless local discontinuous Petrov-Galerkin (MLDPG) method finite-volume particle method convection-dominated flow

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某大型机电设备起竖过程控制与仿真研究

系统仿真学报 2008年第23期20卷 6438-6441页

作者：谢建田桂第二炮兵工程学院陕西西安710025

起竖过程是某大型机电设备工作工程中的一个关键环节。为实现快速起竖,针对现有起竖过程控制方法存在的不足,提出了起竖过程采用bang-bang控制和单神经元自适应PID控制相结合的控制方法。设计了起竖过程控制器。通过AMESim软件和MATLAB/... 详细信息

起竖过程是某大型机电设备工作工程中的一个关键环节。为实现快速起竖,针对现有起竖过程控制方法存在的不足,提出了起竖过程采用bang-bang控制和单神经元自适应PID控制相结合的控制方法。设计了起竖过程控制器。通过AMESim软件和MATLAB/Simulink软件的结合,对起竖过程进行了电液协同仿真研究。仿真结果表明,设计的控制器具有调节时间短、动态性能好、控制精度高、鲁棒性强的优点,可实现该大型机电设备的快速平稳起竖。

关键词：起竖过程控制单神经元PID 仿真

A New Evidence Model and Its Application for Discriminating Enemy Operation Intention

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A New Evidence Model and Its Application for Discriminating ...

2009中国控制与决策会议

作者： LI Ying,Liu Wei-dong The Second Artillery Engineering College,Xi''an,710025,China

＜正＞Considering the signatures captured from information about the hostile operation intention,this paper puts forward concepts of the simplest evidence support format,duality evidence support format,and same-type evidence and so *** on these concepts,it discusses the problem of the orthogonal sum with the duality evidence support format expressed as the simplest evidence support format,and then,drawing its conclusion to show the relation between the enemy intention and the characteristic ***,it establishes a system for operation intention discrimination to complete the final *** new model brings expression and combination of evidences simplified and computation *** practical application,this algorithm has been proved feasibility and effectiveness.

关键词： Intention recognition Evidence model Performance analysis Combination algorithm

国产HTPB复合推进剂裂纹扩展特性的实验研究

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推进技术 1994年第6期15卷 88-92页

作者：屈文忠西安二炮工程学院

依据ＳｃｈａｐｅｒｙＲＡ［１］的粘弹性断裂理论，对国产ＨＴＰＢ复合推进剂进行了Ｉ型型纹扩展实验。分析了裂纹扩展的特性，表明裂纹扩展开始时存在临界应力强度因子ＫＩＣ．得出了该型推进剂裂纹扩展速率ｄａ／ｄｔ与应力强度因子... 详细信息

依据ＳｃｈａｐｅｒｙＲＡ［１］的粘弹性断裂理论，对国产ＨＴＰＢ复合推进剂进行了Ｉ型型纹扩展实验。分析了裂纹扩展的特性，表明裂纹扩展开始时存在临界应力强度因子ＫＩＣ．得出了该型推进剂裂纹扩展速率ｄａ／ｄｔ与应力强度因子ＫＩ间的幂函数关系式。讨论了该推进剂材料断裂能与裂纹扩展速率的关系。

关键词：端羟基聚丁二烯推进剂裂纹扩展应力强度因子

An Exponential Distribution-based Model for Equipment Remaining Life Prediction

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An Exponential Distribution-based Model for Equipment Remain...

2012 National Conference on Information Technology and Computer Science

作者： MENG Xiao-Hong 503 Section of Xi'' an High-tech Institute,710025,Hongqing Town,Xi'' an,China WANG Wei 503 Section of Xi'' an High-tech Institute,710025,Hongqing Town,Xi'' an,China ZHOU Yong-Tao 503 Section of Xi'' an High-tech Institute,710025,Hongqing Town,Xi'' an,China

The article proposed and established an exponential distribution-based model for equipment remaining life *** model is a general decision model for detectable continuous degradation *** modeling method and application example is *** with other models,the model has the basic characteristics of simple and *** has important practice value for maintenance decision of equipment parts fault caused by gradual loss.

关键词： Exponential distribution remaining life equipment maintenance

A MULTI-SCALE MORPHOLOGICAL APPROACH TO SAR IMAGE EDGE DETECTION

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Journal of Electronics(China) 2000年第3期17卷 208-212页

作者： Tang Zhengjun Song Jianshe (Section of Information Engineering, Xi’an Hi-technology Research Institute, Xi’an 710025)

This paper introduces a multi-scale morphological edge detection algorithm to extract SAR image edge which suffers seriously from noise. Combining the basic theme of morphology with that of multi-scale analysis, the algorithm presents the outstanding characteristics of accuracy and robustness. Comparative Experiments reveal its fine performance.

关键词： Mathematical morphology Multi-scale analysis Edge detection Performance evaluation

The Design and Simulation of PID Controller on B PNeural network

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The Design and Simulation of PID Controller on B PNeural net...

2010通信理论与技术新发展——第十五届全国青年通信学术会议

作者： Liu Cang,Du Tao,Wang Minghao (Xi’an Hongqing research Institute of Hi-Tech,China 710025)

About the weakness of traditional PID controller,this paper puts forward a new PID controller based on BP,which can partly calculate simple,non-linear reflection to realize the adaptive setting of PID controller parameter and simulate the system through *** simulation result reveals this method works well in controlling PID parameters,the method is better than the single PID controller

关键词： B Pneural network PID controler digital simulation

A New Aim-Points-Choosing Model for Attacking Mobile Missile Systems

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Journal of Systems Engineering and Electronics 1999年第4期10卷 67-71页

作者： Wu Faping Bi Yiding & Li Jingwen(Xi’an Research Inst. of Hi-Tech., HongQing Town, 710025, P. R. China) Xi'an Research Inst. of Hi-Tech. Hong Qing Town 710025. P. R. China

A new aim-points-choosing model for attacking mobile missile systems in sector region is presented and realized in this paper. The model has the generality for attacking mobile target andis also useful for making an o... 详细信息

关键词： Mobile missile Mathematical model Optimization

Optoelectronic hybrid joint transform correlator based on power spectrum subtracting and exponential filtering

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Optoelectronic hybrid joint transform correlator based on po...

Photonics Asia 2004:Information Processing and Data Storage

作者： Hongxia Wang Junfa He Zhaoxuan Sheng Physics department Hongqing high technology Institute Xi’an China 710025

A new kind of optoelectronic hybrid joint transform correlator is proposed in this paper, it fulfills edge enhancement preprocessing for the input images in the spatial field and subtraction modifying

关键词： joint transform correlator power spectrum edge enhancement exponential filter correlation recognition optoelectronic hybrid Fourier transform preprocessing correlation peak discrimination ability