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7th International Conference on Renewable Energy Research and Applications (ICRERA)

作者： Izumi, Yoshiro Ueda, Yuzuru Tokyo Univ Sci Katushika Ku 6-3-1 Niijuku Tokyo 1258585 Japan

ISBN: (纸本)9781538659823

We propose the method to calculate the degradation rate of PV modules by outdoor linear interpolation method (LIM). Since the reference I-V curves which are based on measured I-V curves and used to LIM are created in each season, transitions of expected I-V curves indicate how PV modules degrade. The degradation rates of not only the maximum power but also the other parameters such as short circuit current and open circuit voltage can be calculated from the expected I-V curves. In this paper, the outdoor degradation rates of poly crystalline Si and CIGS were calculated. As a result, in poly crystalline Si case, the degradation rate of maximum power was calculated as -0.4 %/year due to short circuit current reduction. In CIGS case, although the initial power generation performance was better than the datasheet value, the annual degradation rate of the maximum power was calculated as -2.1 %/year. The reason of maximum power reduction was the reduction of both short-circuit current and open-circuit voltage.

关键词： linear interpolation method photovoltaic module degradation poly crystalline silicon CIGS

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Evaluation of PV Module Outdoor Degradation rate by means of I-V Curve Fitting with DE and linear interpolation method 7

Evaluation of PV Module Outdoor Degradation rate by means of...

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7th IEEE World Conference on Photovoltaic Energy Conversion (WCPEC) / A Joint Conference of 45th IEEE PVSC / 28th PVSEC / 34th EU PVSEC

作者： Izumi, Yoshiro Ueda, Yuzuru Tokyo Univ Sci Tokyo 1258585 Japan

ISBN: (纸本)9781538685297

Degradation rates of photovoltaic (PV) modules were calculated by means of linear interpolation method only using outdoor data such as module temperature, solar irradiance, and current-voltage characteristics. This method could quantify not only degradation rates of output power of PV modules but also the others characteristic values such as short-circuit current, open-circuit voltage, and fill factor. As a result, it is revealed that crystalline silicon PV modules are degraded due to current reduction. In addition, relative errors of calculated degradation rate of each characteristic values are within 0.8% in average by comparing with the result of indoor measurement.

关键词： degradation linear interpolation method differential evolution filtering

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Prediction of distortion in a thin-plate structure with intermittent fillet joints using a local-to-global approach

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JOURNAL OF MANUFACTURING PROCESSES 2023年 99卷 718-734页

作者： Liu, Rui Sun, Yu Ni, Jun Nanjing Univ Sci & Technol Sch Mech Engn Nanjing 210094 Peoples R China

Fillet welds by intermittent welding are widely used in the welding of centrifugal fans, such as attaching a fan blade to the rear plate. The intermittent welding method transforms the full-length continuous weld into multiple short welds to minimize distortion by reducing the total heat input for a welded joint to control welding distortion. An infinite number of short welds are created during this process. However, depending on the complexity of the model, the computational cost of predicting welding distortion based on full-scale modeling is considerable. These numerous short welds undoubtedly complicate modeling and computations, limiting rapid distortion prediction for large and complex structures. This study develops an equivalent deformation calculation approach based on a local-to-global technique and applies it to predict distortion of a fillet joint welded spec-imen. The approach consists of two steps. First, the welding-induced structural deformation is calculated for a two-dimensional (2D) weld and a 2D heat-affected zone (local calculation). Second, the 2D structural defor-mation is applied to the full-scale welded structure using a nearest-point spatial interpolation algorithm to ac-quire the three-dimensional (3D) equivalent deformation (global calculation). Note that the weld shape was considered in both local and global calculations. In addition, welding tests were performed, and the coordinates of the key points were measured. The geometric parameters of the welds used in the numerical simulations were obtained from experimental observations. Finally, the key point coordinates obtained by the proposed approach were compared with experimental measurements. Furthermore, the distribution of out-of-plane distortion caused by the new approach was compared with the simulation results of the thermo-elastic-plastic method performed on a full-scale welded structure. The proposed approach can be verified by both comparisons.

关键词： Welding distortion Intermittent welding Weld shape Static finite element analysis linear interpolation method

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A Change-point Wavelet method to Hard Drives Running Status

A Change-point Wavelet Method to Hard Drives Running Status

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作者： Xiaojian Li Hailan Wang Jiajia Zhang Huang Liang Fu Liao Yiyi Jiang School of Computer Science &Information Engineering Guangxi Normal University

Traditional statistical methods are currently used to analyze the feature of hard drives failure, but difficult to model the failure feature for random events with small probability of hard drives failure or datasets with unbalanced and missing values. Therefore, this paper presents a change-point wavelet transform(CPWT) method,which can extract the indicative SMART change-point features of failed hard drives. Because wavelet has the ability of denoting local signal characteristics in the time domain and frequency domain, we use the wavelet transform method to extract the sudden change features of the time series, to reveal the characteristics of the change-point wavelet. Then, we use convolution network and long short-term memory(CNN-LSTM) model, to verify the effectiveness of the change-point wavelet extracted for failure prediction. The experimental results show that the change-point wavelet evaluates the health of the hard drives, the accuracy and precision of prediction are 91.56% and 90.78% respectively, confirming that the change-point wavelet has a certain predictive ability for hard drives failures, which provides a basis for cloud storage failure judgment and prediction.

关键词： time series running status linear interpolation method change-point wavelet wavelet shape neural network model

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Integrated experimental-computational approach for evaluating elastic modulus of cement paste corroded in brine solution on microscale

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CONSTRUCTION AND BUILDING MATERIALS 2018年 162卷 459-469页

作者： Li, Yue Zhang, Guosheng Wang, Zigeng Wang, Peng Guan, Zhongzheng Beijing Univ Technol Key Lab Urban Secur & Disaster Engn Minist Educ Beijing Key Lab Earthquake Engn & Struct Retrofit Beijing 100124 Peoples R China Beijing Univ Technol Coll Architecture & Civil Engn 100 Pingleyuan Beijing Peoples R China

This paper presented an integrated computational-experimental approach for evaluating elastic modulus of cement paste corroded in brine solution on nanoscale. In the first place, the cured specimens were corroded in brine solution at room temperature for 90 days. Subsequently, the elastic moduli of 32 points of the corroded cement paste specimen were measured by nanoindentation test. Then, a three-dimensional nanoindentation model was established with finite element method and modified constitutive relation. The input parameters of the model were calibrated based on the test results and linear interpolation method. Finally, the difference between the simulation results and the experimental results was compared with good agreement. Therefore, the nanoindentation model established in this paper can predict the nanoindentation experiment well and the modified constitutive relation is effective. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： Corroded cement paste Nanoindentation model Elastic modulus Modified constitutive relation linear interpolation method

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Formation Optimization Of RoboCup3D Soccer Robots Using Delaunay Triangulation Network 30

Formation Optimization Of RoboCup3D Soccer Robots Using Dela...

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30th Chinese Control and Decision Conference (CCDC)

作者： He, Keji Liang, Zhiwei Cui, Tongxin Ke, Zhiying Liu, Zichang Zhao, Qian Fang, Fang Nanjing Univ Posts & Telecommun Coll Automat Nanjing 210046 Peoples R China Southeast Univ Sch Automat Key Lab Measurement & Control CSE Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781538612446

In RoboCup3D robot simulation platform, team collaboration plays an important role in order to win a game. This paper proposes a novel method of team formation design. Firstly, the Delaunay triangulation method is applied to divide the football field into small triangular parts. Then, the SBSP mechanism for the team is employed to choose a reasonable formation. Subsequently, the linear interpolation method is used to calculate robots' positions in different formations with data set given beforehand. As a result, the team can get the most optimal formation for the football in different positions. The experimental results demonstrate the effectiveness of our methods.

关键词： RoboCup Soccer robots Delaunay triangulation SBSP mechanism Formation design linear interpolation method

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Relative Contribution of Frequency and Parameter Values to Selectivity for Interaural Correlation

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电脑学刊 2018年第2期29卷 21-33页

作者： Han Zhu Hui Zhang Song Wang Cong Zhang

With the advent of the digital age, 3D audio is confronted with an important issues that how to compress multi-channel audio signal effectively. It is a significant way to explore the perceptual mechanism of human ear by researching the relative contribution of frequency and parameter values to selectively for Interaural Correlation (IC). Five values of IC that corresponding to five special sound width are selected in accordance with qualitative analysis of perceptual characteristics for IC: 1, 0.98, 0.94, 0.87 and 0.77. The audible frequency range of the human ear is divided into 24 bands based. A self-adaption test method contained the traditional test methods such as 1 up/2 down and 2AFC is taken, the test sequences are chosen as Gaussian white noise, and the experimental data is analyzed mathematically by the linear interpolation method. The experiment results demonstrate that: JND changes more significantly with frequency, and the minimum value occurs at about 700Hz and 1170Hz while the maximum values correspond to both side bands and the JND increases as the IC of the standard increasing. The experimental data and conclusions can provide theoretical support for the efficient compression of 3D audio signals.

关键词： IC JND linear interpolation method self-adaption test method spatial audio coding

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Formation Optimization Of RoboCup3D Soccer Robots Using Delaunay Triangulation Network

Formation Optimization Of RoboCup3D Soccer Robots Using Dela...

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第30届中国控制与决策会议

作者： Keji He Zhiwei Liang Tongxin Cui Zhiying Ke Zichang Liu Qian Zhao Fang Fang College of Automation Nanjing University of Posts and Telecommunications

In RoboCup3D robot simulation platform,team collaboration plays an important role in order to win a *** paper proposes a novel method of team formation ***,the Delaunay triangulation method is applied to divide the football field into small triangular ***,the SBSP mechanism for the team is employed to choose a reasonable ***,the linear interpolation method is used to calculate robots' positions in different formations with data set given *** a result,the team can get the most optimal formation for the football in different *** experimental results demonstrate the effectiveness of our methods.

关键词： RoboCup Soccer robots Delaunay triangulation SBSP mechanism Formation design linear interpolation method

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Comparison Of methods For Measuring Shockduration

Comparison Of Methods For Measuring Shockduration

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作者： Kunz, Jan Brno University of Technology

This paper compares a linear interpolation, an interval and a sine interpolation method for measuring mechanical shock duration. All methods are analysed to find differences and limitations. Then methods are tested on simulated and real shock shapes to confirm analysis results. We discovered that the sine interpolation method is very robust to noise, however is sensitive to shock shape changes. The linear interpolation method accuracy is influenced by noise, however this method works also on high noise level (SNR = 0 dB). The interval method provides consistent results up to some noise level (SNR > 10 dB), where it stops working.

关键词： mechanical shock half-sine shock duration measurement linear interpolation method interval method sine interpolation method

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Combining linear interpolation with extrapolationmethods in range-separated ensemble density functional theory

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MOLECULAR PHYSICS 2016年第7-8期114卷 968-981页

作者： Senjean, Bruno Hedegard, Erik D. Alam, Md. Mehboob Knecht, Stefan Fromager, Emmanuel Univ Strasbourg CNRS Inst Chim Lab Chim Quant Strasbourg France ETH Phys Chem Lab CH-8092 Zurich Switzerland

The combination of a recently proposed linear interpolation method (LIM), which enables the calculation of weight-independent excitation energies in range-separated ensemble density functional approximations, with the extrapolation scheme of Savin is presented in this work. It is shown that LIM excitation energies vary quadratically with the inverse of the range-separation parameter when the latter is large. As a result, the extrapolation scheme, which is usually applied to long-range interacting energies, can be adapted straightforwardly to LIM. This extrapolated LIM (ELIM) has been tested on a small test set consisting of He, Be, H-2 and HeH+. Relatively accurate results have been obtained for the first singlet excitation energies with the typical = 0.4 value. The improvement of LIM after extrapolation is remarkable, in particular for the doubly excited 2(1)sigma(+)(g) state in the stretched H-2 molecule. Three-state ensemble calculations in H-2 also show that ELIM does not necessarily improves relative excitation energies, even though individual excitation energies are more accurate after extrapolation. Finally, an alternative decomposition of the short-range ensemble exchange-correlation energy is proposed in order to correct for ghost-interaction errors in multi-determinant range-separated ensemble density functional theory calculations. The implementation and calibration of such a scheme are currently in progress. [GRAPHICS] .

关键词： Ensemble density functional theory range separation linear interpolation method ghost interaction

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