17062 research outputs found
Sort by
Error Characteristics of Neural Network-assisted Brillouin-Gain-Spectrum-based Strain Measurements
Get PDFThe frequency shift of the Brillouin gain spectrum (BGS) in optical fibers can be used for strain measurement. However, for the practical application of this BGS-based optical-fiber strain measurement, elucidating the characteristics of its measurement error is crucial. In this study, we first performed numerical simulations to investigate the error characteristics of our proposed neural network (NN)-assisted BGS-based strain measurement method. Notably, strain nonuniformity was considered within the section where BGS was observed (i.e., spatial resolution), and the BGS values within the analysis area, used to measure the strain, were fed into the NN. The results revealed that the error was inversely proportional to the 0.48 and 0.27 powers of the numbers of BGS values in the position and frequency ranges of the analysis area, respectively. Furthermore, the error was inversely proportional to the 0.52 power of the position range and was constant in the frequency range above the maximum frequency variation. Training the NN with BGS values with various full widths at half maximum and noise with different standard deviations enabled it to measure the strain without being affected by them. Furthermore, the strain measurement errors for a beam and ring were investigated through numerical simulations and proof-of-concept experiments. The results confirmed that the proposed method could measure nonuniform strains with V-shaped and sinusoidal variations (typical local strain distributions of beams and rings) with much smaller errors than conventional methods.journal articl
日本近海の水温分布が令和3年8月に九州北部で発生した大雨に及ぼす影響
Get PDFapplication/pdf三重大学大学院生物資源学研究科共生環境学専攻地球環境学講座未来海洋予測学研究室62Pthesi
複合負荷状態における塑性流動条件下でのZr55Al10Cu30Ni5バルク金属ガラスの弾性限界の特定に関する実験的研究
Get PDFapplication/pdf三重大学大学院 工学研究科 博士前期課程 機械工学専攻 生体システム工学研究室33pthesi
ダブルエンコーダと減速機を内蔵したモータのねじれ角速度に依存する摩擦のモデルを用いた負荷トルク制御
Get PDFapplication/pdf三重大学大学院工学研究科 電気電子工学専攻59pthesi
高温酸化反応によるSiOxならびにSnO2ナノワイヤー形成とキャラクタリゼーション
Get PDFapplication/pdf三重大学大学院 工学研究科 博士前期課程 応用化学専攻 ナノ材料物理化学研究室45pthesi
