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2nd International Conference on Reliability Systems Engineering (ICRSE)

作者： Chen, Xiaoguang Tao, Junyong Bai, Guanghan Zhang, Yunan Natl Univ Def Technol Lab Sci & Technol Integrated Logist Support Coll Mechatron & Automat Changsha Hunan Peoples R China

ISBN: (纸本)9781538609187

A general method for the reliability evaluation of multistate networks is using minimal path vectors (d-MPs for short). Most reported works on generating d-MPs are based on minimal paths (MPs for short). Currently, all reported MP-based algorithms generate duplicated d-MPs during the search process and additional recursive comparison is required to remove those duplications. However, the number of duplications increases substantially with the size of network. Thus, a more efficient algorithm is needed to search for all d-MPs without duplications. In this study, we proposed an improved algorithm based on the breadth-first search to search for d-MPs without duplications. The mechanism on generating duplicated d-MPs is investigated. A novel approach is incorporated into the existing algorithm to generate the d-MPs without duplications. Through computational experiments, it is found that the proposed algorithm is more efficient than existing algorithms for finding all d-MPs.

关键词： Multistate networks Minimal path vectors recursive algorithm duplication

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State-space blur model for high-speed forward-moving imaging system and its recursive restoration

State-space blur model for high-speed forward-moving imaging...

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27th International Congress on High-Speed Photography and Photonics

作者： Cao, Fengmei Chen, Xichun Jin, Weiqi Beijing Inst Technol Dept Opt & Photon Engn 5 S Zhongguancun St Beijing 100081 Peoples R China

ISBN: (纸本)9780819463494

When an imaging system is approaching the object at a high speed, because of the existence of integration time, the images obtained are always blurred radially. Since the degradation process is space variant, this kind of blur is difficult to handle, traditional frequency domain techniques can't be applied here. Obviously, the radially blurred image obtained is rotation symmetrical, so the usual uniformly sampled image can be resampled with fan-shaped grids, and the gray level of these new sampling points build up a new image matrix. The new image matrix's columns and rows are never the edges of the image, but the image's radius and angle. So, the original two-dimensional problem is simplified. Even after the resampling, the blur is still space variant, and the PSF (point spread function) will change along the radius direction. So the authors come up with a state-space method, a state-space blur model is constructed, which handles the problem recursively. To restore the degraded image simply means to find the inverse of the degradation system and computer simulation result shows the restoration algorithm restored the radially blurred image approvingly.

关键词： motion blur image restoration state-space model recursive algorithm resampling

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Study on Degree of Engineering Changes Based on Product Family

Study on Degree of Engineering Changes Based on Product Fami...

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2nd International Conference on Manufacturing Science and Engineering

作者： Zeng, Fuhong Zhou, Lanhua Li, Zerong Panzhihua Univ Panzhihua 617000 Peoples R China

ISBN: (纸本)9783037850398

In order to get the total Degree of Engineering Changes for product family (EDCKBOM), which can help enterprise to select a scheme of Engineering Changes (EC) with a minor EDCKBOM and analyze the type of change propagation for the CE in the product family, the Knowledge-body based on Bill of Material (KBOM) model was built for representing domain-specific knowledge, which was described as trial(GUS, CUS, GUR) and manifested as an AND/OR tree structure. Then, a complete solution system based on recursive algorithm was designed to compute the EDCKBOM. Finally, an example was given, and the approach was proved to be efficient and practical.

关键词： Engineering Changes Bill of Material Change Propagation recursive algorithm

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Monitoring of Tooth Passing and Chatter Properties in End-Milling

Monitoring of Tooth Passing and Chatter Properties in End-Mi...

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International Conference on Advanced Engineering Theory and Applications (AETA)

作者： Kim, Jong-Do Chin, Do-Hun Kim, Kwang-Heui Yoon, Moon-Chul Jungwon Univ Ind Acad Cooperat Fdn Gaesan Choongbuk South Korea JIB Tech 44-23 Sangdong Ro 375 Beon Gil Gimhae City South Korea Pukyong Natl Univ Dept Machine Design Engn Busan South Korea

ISBN: (纸本)9783319509044;9783319509037

The purpose of this study is to develop a reliable machining condition monitoring system (MCMS) of end-milling for practicing engineers, which is a monitoring system with time series recursive algorithm. The suggested MCMS can analyze end-milling force signals using power spectrum analysis (PSA) and frequency response function analysis (FRFA) with recursive parametric model. Comparing with other non-parametric technique of time series, the suggested PSA and FRFA are using recursive parametric techniques. It is applied to practical application for monitoring of tooth passing which is closely related to spindle speed and chatter vibration. In order to detect several independent physical components such as tooth passing and chatter, it is presented in the frequency domain. This analysis provides an effective method in monitoring. The proposed MCMS is an efficient and reliable method for detecting spindle speed and malfunction behavior. In PSA and FRFA analysis, the recursive extended instrument variable(REIV) is used for on-line identification and mode detection in end-milling. The objective of MCMS in this work also includes a comparison of chatter and tooth passing with recursive algorithm.

关键词： Chatter frequency Frequency response function (FRF) recursive algorithm Power spectrum (PS) Tooth passing frequency

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On-line estimation of dynamic systems parameters in the presence of outliers in observations

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Informatica (Netherlands) 1994年第1-2期5卷 189-210页

作者： Pupeikis, Rimantas Institute of Mathematics and Informatics Vilnius 2600 Akademijos St.4 Lithuania

In the previous papers (Novovicova, 1987;Pupeikis 1991) the problem of recursive least square (RLS) estimation of dynamic systems parameters in the presence of outliers in observations has been considered, when the filter, generating an additive noise, has a transfer function of a particular form, see Fig. 1, 2. The aim of the given paper is the development of well-known classical techniques for robust on-line estimation of unknown parameters of linear dynamic systems in the case of additive noises with different transfer functions. In this connection various ordinary recursive procedures, see Fig. 2-6, are worked out when systems’ output is corrupted by the correlated noise containing outliers. The results of numerical simulation by IBM PC/AT (Table 1) are given. © 1994 Institute of Mathematics and Informatics.

关键词： Dynamic system Outlier Parameter estimation recursive algorithm Robustness

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A Kernel for recursive Phase-Corrected Wavelet Transform for Power Quality Assessment

A Kernel for Recursive Phase-Corrected Wavelet Transform for...

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13th International Conference on Harmonics and Quality of Power

作者： Crovato, C. D. P. Susin, A. Embrasul Ind Eletron Av Bahia 684 BR-90240551 Porto Alegre RS Brazil Univ Fed Rio Grande do Sul Dept Elect Engn BR-90035190 Porto Alegre RS Brazil

ISBN: (纸本)9781424417711

This paper shows a new polynomial Kernel (a non-Gaussian window) suitable for the implementation of Phase Corrected Wavelet Transform, in a recursive manner, which the target is to track harmonics and inter-harmonics and achieve acceleration in the disturbances detection process and help the waveform characterization in Power Quality Analyzers that must be in compliance at the same time with the Power Quality EEC standards. Synthetic signals are generated and tested simulating many kinds of disturbances, tracking the fundamental, in four cycles or less, even in noisy environments.

关键词： Kernel Amplitude estimation frequency estimation phase estimation Power Quality recursive algorithm signal detection signal processing S-Transform Wavelet Transform

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Shape optimization using parallel genetic algorithm and multilevel parameterization algorithm

Shape optimization using parallel genetic algorithm and mult...

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Symposium on Non-Grid-Connected Wind Power

作者： Wang, Guangwen Zhou, Zhenggui Hu, Jun Nanjing Univ Aeronaut & Astronaut Energy & Power Inst Nanjing 210016 Peoples R China

ISBN: (纸本)9780979847110

This paper presents an adaptive multilevel parameterization algorithm based on genetic optimization algorithm in view of the design issues on blade profile and airfoil. According to the principle of multi-grid method, this algorithm using the recursive algorithm of Bezier curve transforms the design variables and their numbers between upper-lower levels saves the prefect individuals. from upper level to lower level in the optimization iterative process. The optimization efficiency is greatly improved by the advancement of simple genetic algorithm, and a local parallel network optimization platform according to the property of genetic algorithm is built, which leads to less time cost. An example on curve transformation and the other on blade profiles optimization are given in the end. The results indicate that the adaptive multilevel parameterization algorithm can obviously accelerate convergence of the iterative, especially, a small number of individuals.

关键词： shape optimization multilevel parameterization algorithm parallel genetic algorithm Bezier curve recursive algorithm

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Iterative Closed-Loop Identification of MIMO Systems Using ARX-Based Leaky Least Mean Square algorithm 4

Iterative Closed-Loop Identification of MIMO Systems Using A...

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4th IEEE International Conference on Control System Computing and Engineering (ICCSCE 2014)

作者： Rahim, Mohamed. A. Ramasamy, M. Tufa, Lemma D. Faisal, Abdelraheem Univ Teknol PETRONAS Dept Chem Engn Bandar Seri Iskandar 31750 Perak Malaysia

ISBN: (纸本)9781479956869

Closed-loop identification of MIMO systems is considered. An iterative Leaky Least Mean Squares (LLMS) algorithm is proposed for the development of ARX structure. The performance of the proposed algorithm with respect to the existing recursive algorithms is investigated in a simulation study. The simulation results show that the proposed algorithm can produce more accurate parameter estimates than the conventional recursive algorithms.

关键词： Closed-loop Identification Leaky Least Mean Square ARX recursive algorithm

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Generation of fixed polarity arithmetic spectra for ternary functions

Generation of fixed polarity arithmetic spectra for ternary ...

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IEEE Asia Pacific Conference on Circuits and Systems

作者： Lozano, Cicilia C. Falkowski, Bogdan J. Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

ISBN: (纸本)9781424403868

A new efficient algorithm for generating polarity matrix elements of ternary fixed polarity arithmetic transform is presented. The algorithm directly operates on the truth vector of a ternary function and it calculates the spectral coefficients of all or selected fixed polarity arithmetic expansions for the function. It is simple and works in a recursive manner. Computational cost for the new algorithm has been derived and it is shown that the new algorithm has low computational costs.

关键词： arithmetic transform recursive algorithm ternary functions

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Group-Delay-Controlled Multiple-Resonator-Based Harmonic Analysis 19

Group-Delay-Controlled Multiple-Resonator-Based Harmonic Ana...

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19th International Symposium on Power Electronics (Ee)

作者： Kusljevic, Miodrag D. ' Tomic, Josif J. Poljak, Predrag D. Termoelektro Enel AD Uralska 9 Belgrade 11060 Serbia Univ Novi Sad Fac Tech Sci Trg Dositeja Obradov 6 Novi Sad 21000 Serbia Inst Chem Technol & Met Dept Microelect Technol Njegoseva 12 Beograd 11000 Serbia

ISBN: (纸本)9781538635025

In this paper, a modified and improved approach to the recently proposed multiple-resonator-based observer structure for harmonic estimation has been proposed. In the previous papers, two inherent particular cases have been considered. In the first case, estimation is performed in the point located in the middle of the observation interval, and exhibits good noises and unwanted harmonics attenuation but possesses a large response delay. In the second case, the estimation point is at the end of the observation window. In this case, the filters are able to form a zero-flat phase response about the operation frequency and hence able to provide instantaneous estimates, but with large overshoots caused by resonant frequencies at the edges of the pass band, and the high level of the sidelobs. In this paper, the estimation point is shifted along the observation interval reshaping frequency responses to tradeoff between those opposite requirements. The effectiveness of the proposed algorithm is shown through simulations.

关键词： Discrete Fourier transform (DFT) group delay harmonic analysis finite-impulse-response (FIR) filter maximally flat (MF) filter multiple-resonator (MR) recursive algorithm Taylor-Fourier transform (TFT)

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