DSpace community: 航空太空工程學系暨研究所

建立變動環境因素下之狀態維護最佳化策略模型：以航空發動機維護排程為例

Thu, 12 Mar 2026 04:07:42 GMT

title: 建立變動環境因素下之狀態維護最佳化策略模型：以航空發動機維護排程為例

結合蝙蝠演算法與差分演化法於結構最佳化設計之應用

Fri, 06 Mar 2026 04:08:47 GMT

title: 結合蝙蝠演算法與差分演化法於結構最佳化設計之應用 abstract: 本研究結合蝙蝠演算法與差分演算法於結構最佳化之設計，蝙蝠演算法是屬於仿生演算法的其中一種，其特點為模仿蝙蝠的獵食行為以搜尋最佳解。蝙蝠演算法具有進行大範圍的搜尋、準確率高且執行全域搜尋的優點。差分演算法是屬於演化演算法的其中一種，優點是良好的區域搜尋能力、架構容易理解且參數設定簡單，再加上不讓母體有單一性的疑慮，本研究提出的混合法則是結合兩種演算法的優點，利用蝙蝠演算法的全域搜尋再結合差分演算法的多樣性用以加強蝙蝠演算法的區域搜尋能力以獲得最佳解。本研究藉由五個不同的範例進行結構最佳化的分析將題目所述轉為數學函式，再利用結合後的演算法對結構執行最佳化設計。由數據分析的結果，顯示此混合法能得到比單獨使用蝙蝠演算法求出的數據更好，而應用在結構之最佳化上得到不錯的結果。

A comprehensively validated three-step global mechanism for high-fidelity simulation of oblique detonation waves in n-decane–air mixtures

Fri, 06 Mar 2026 04:06:32 GMT

title: A comprehensively validated three-step global mechanism for high-fidelity simulation of oblique detonation waves in n-decane–air mixtures abstract: This study presents a new three-step global chemical mechanism for n-decane/air combustion, specifically optimized for efficient simulation of oblique detonation waves (ODWs). The parameters in the global mechanism were specially formulated to enable predictions of essential features in ODWs, including ignition delays, heat release distribution, and detonation velocity with substantially reduced computational cost while preserving fidelity. Comprehensive validations are conducted through extensive numerical simulations, supported by direct comparisons with experimental shock tube data and a skeletal mechanism (Skel40). The proposed mechanism was found to demonstrate predictive robustness across a wide range of combustor conditions, spanning initial temperatures from 600 to 1600 K, pressures from 10 to 1000 kPa, and equivalence ratios from 0.5 to 1.6. As demonstrated in two-dimensional simulations of ODWs, the proposed three-step mechanism predicts key features consistent with those from Skel40 but with a 56-fold improvement in computational efficiency. This new capability provides a reliable and convenient alternative for system-level detonation modeling.

Shock-like Magnetic Enhancements Generated by Kelvin–Helmholtz Instability above Weakly Magnetized Bodies

Fri, 06 Mar 2026 04:06:27 GMT

title: Shock-like Magnetic Enhancements Generated by Kelvin–Helmholtz Instability above Weakly Magnetized Bodies abstract: Shock-like magnetic field structures above weakly magnetized bodies such as the Moon have been reported for more than half a century and represent a key long-standing feature of their solar-wind interactions. Yet their physical origin has remained without a satisfactory explanation, particularly regarding their steepened profiles and high-altitude extension. Here we show that a long-overlooked nonlinear branch of the Kelvin–Helmholtz instability (KHI) naturally produces these localized external magnetic enhancements. Using magnetohydrodynamic simulations constrained by Lunar Prospector (LP) observations, we demonstrate that velocity shear at the solar-wind–crustal-anomaly interface can trigger a KHI whose nonlinear evolution generates outwardpropagating fast-mode shocks that are distinct from the familiar vortex-type KHI waves. These KHI-driven shocks reproduce the LP-observed amplitude and morphology of lunar magnetic enhancements extending hundreds of kilometers above the surface. Two distinct nonlinear KHI regimes, one shock-dominated and one vortex-dominated, together provide a unified framework that explains both the morphological diversity and the wide range of amplitudes of localized magnetic enhancements observed above the Moon and can be applied to other weakly magnetized bodies, revealing a previously unrecognized mechanism governing solar-wind interactions with crustal magnetic anomalies across the solar system.

Quantum Space Thruster

Thu, 05 Mar 2026 04:10:48 GMT

title: Quantum Space Thruster abstract: An innovative ion thruster is conceptually introduced by utilizing the superconductor. Two remarkable quantum features of the superconductor, significant magnetic strength and quantum locking, have been applied to the plasma generator and ion accelerator, respectively. The former feature greatly reduces the need for electric power to generate a huge magnetic field and also reduces the size of the plasma generator. The latter feature provides the ion passage channels and prevents them from colliding with each other. Simulation results show agreement with the reduced electric power needed compared to the traditional ion thruster. In addition, the ion beams are shown to be restricted in the individual channels generated by quantum locking. In this way, this thrust provided by the ion beams is greater than that of the conventional ion thruster.

火箭結構與軌跡最佳化設計

Fri, 27 Feb 2026 04:07:42 GMT

title: 火箭結構與軌跡最佳化設計

量子人工智慧品質檢測於航空領魚的應用

Fri, 27 Feb 2026 04:07:40 GMT

title: 量子人工智慧品質檢測於航空領魚的應用

Superconducting Driven Electron Cyclotron Resonance as Plasma Generator in Discharge Chamber of Ion Thruster

Fri, 27 Feb 2026 04:07:37 GMT

title: Superconducting Driven Electron Cyclotron Resonance as Plasma Generator in Discharge Chamber of Ion Thruster

Comparison of different total impulse and structure ratio of the primary optimal rocket mass design

Fri, 27 Feb 2026 04:07:34 GMT

title: Comparison of different total impulse and structure ratio of the primary optimal rocket mass design

推力轉換的不同方式之比較

Fri, 27 Feb 2026 04:07:32 GMT

title: 推力轉換的不同方式之比較

Superconducting Magnetic Nozzle Ion Thruster (SC-MNIT): A High-Specific-Impulse Propulsion Concept for Future Deep-Space Missions

Fri, 27 Feb 2026 04:07:28 GMT

title: Superconducting Magnetic Nozzle Ion Thruster (SC-MNIT): A High-Specific-Impulse Propulsion Concept for Future Deep-Space Missions

Power transmission of whistlers in the lunar ionosphere

Wed, 14 Jan 2026 04:05:50 GMT

title: Power transmission of whistlers in the lunar ionosphere abstract: This study investigates the power transmission ratio of lunar whistlers below 10 Hz for the first time by solving full wave equations that incorporate collisional effects for waves propagating upward from the surface to 100 km high in an ionosphere with four dominant ion species at temperatures of 150 K and 400 K in the lunar crustal field environment. The results indicate that increasing wave frequencies lead to decreasing power transmission ratios. This trend is consistent with the satellite observations near the Moon, which predominantly detect peak wave intensities at lower frequencies. Stronger magnetic field intensities and larger angles between the field and the surface led to an increase in power transmission ratios. This finding is consistent with the increased detection of waves in regions with higher field intensities and the more frequent occurrence rate of broadband whistlers linked to larger angles. As the temperature increases, the power transmission ratio increases, consistent with the higher occurrence rates of broadband whistlers at regions with smaller solar zenith angles. Incorporating the Doppler shift effect from solar wind on the observed wave frequency, the selenographic distribution of power transmission ratios exceeding −3 dB within the instrumentally detectable frequency range shows a heightened northern–southern asymmetry, aligning with the established patterns of wave intensities and occurrence rates. The preference to measure harmonic whistlers at lower altitudes can be attributed to the attenuation of the higher-frequency component at higher altitudes. The fact that the intensities of left-hand polarized components are more pronounced can also be interpreted.

大型遙控直升機主旋翼主軸承螺栓受力分析

Tue, 16 Dec 2025 04:07:04 GMT

title: 大型遙控直升機主旋翼主軸承螺栓受力分析

旋翼葉片尖端外形效益分析

Tue, 16 Dec 2025 04:06:59 GMT

title: 旋翼葉片尖端外形效益分析

新冠肺炎之航空業因應對策-以中華航空為例

Tue, 16 Dec 2025 04:06:55 GMT

title: 新冠肺炎之航空業因應對策-以中華航空為例 abstract: 2019年底起陸續爆發新冠肺炎疫情，短短數月，全世界各國蔓延淪陷深受Covid-19病毒其害，使得以地球村為範疇運行的航空業，遭逢前所未見的重大影響，因多數國家禁航載運普羅大眾相互來往，令各國航空公司客運票務收入呈現雪崩式下滑，而間接不變的人事成本將大幅成為公司營運負擔，不僅是各國各航空公司面臨的重要課題，也是間接變相的國安問題。成為本研究以台灣為本體主要國航代表-中華航空，吾人分析該公司於疫情中之應變能力，及其研究之根本進而創造盈餘之操作為面向，證實華航相關滾動式政策，是藉由公司風險管控作為以及市場機制調整之應變。吾人以綜觀華航財報及國際間政、經之考量，以及國際上各研究機構相關資料彙整獲得本文最後結論，藉以後續航空從業人員參考之。

飛行器連接件環境腐蝕因素之探討

Tue, 16 Dec 2025 04:06:52 GMT

title: 飛行器連接件環境腐蝕因素之探討

使用機器學習分析複合材料層板之拉伸強度

Tue, 16 Dec 2025 04:06:48 GMT

title: 使用機器學習分析複合材料層板之拉伸強度

以機器學習分析轉動不平衡之現象

Tue, 16 Dec 2025 04:06:44 GMT

title: 以機器學習分析轉動不平衡之現象

以數值模擬評估雙聲學黑洞橫樑之減震及發電效應

Tue, 16 Dec 2025 04:06:41 GMT

title: 以數值模擬評估雙聲學黑洞橫樑之減震及發電效應

附生植物拍擊概念之仿生振動擷能系統

Tue, 16 Dec 2025 04:06:37 GMT

title: 附生植物拍擊概念之仿生振動擷能系統

蜻蜓拍翼啟發之雙樑振動機構擷能系統

Tue, 16 Dec 2025 04:06:34 GMT

title: 蜻蜓拍翼啟發之雙樑振動機構擷能系統

單一彈簧連結之雙層橫樑減振及振動擷能系統

Tue, 16 Dec 2025 04:06:30 GMT

title: 單一彈簧連結之雙層橫樑減振及振動擷能系統

倒錘式拉伸及擺動振動擷能系統

Tue, 16 Dec 2025 04:06:26 GMT

title: 倒錘式拉伸及擺動振動擷能系統

基於共振原理之旋轉系統振動發電效益實驗研究

Tue, 16 Dec 2025 04:06:21 GMT

title: 基於共振原理之旋轉系統振動發電效益實驗研究

全槽式聲學黑洞減振樑於減振及電能轉換之分析

Tue, 16 Dec 2025 04:06:18 GMT

title: 全槽式聲學黑洞減振樑於減振及電能轉換之分析

多減振器排列位置於振動平板減振之研究

Tue, 16 Dec 2025 04:06:14 GMT

title: 多減振器排列位置於振動平板減振之研究

二維三自由度氣彈振動體之減振分析

Tue, 16 Dec 2025 04:06:10 GMT

title: 二維三自由度氣彈振動體之減振分析

以機器學習評估風速氣象對於各式直升機適航勤務之影響

Tue, 16 Dec 2025 04:06:06 GMT

title: 以機器學習評估風速氣象對於各式直升機適航勤務之影響

以機器學習（ML）及失效模式與效應分析（FMEA）方法研究多功能顯示器損壞原因

Tue, 16 Dec 2025 04:06:03 GMT

title: 以機器學習（ML）及失效模式與效應分析（FMEA）方法研究多功能顯示器損壞原因

直升機主旋翼葉片振動調校之準則分析

Tue, 16 Dec 2025 04:05:59 GMT

title: 直升機主旋翼葉片振動調校之準則分析

基於聲學黑洞理論之彈性樑應用於複合式彈性鋼片減振及獵能系統

Tue, 16 Dec 2025 04:05:55 GMT

title: 基於聲學黑洞理論之彈性樑應用於複合式彈性鋼片減振及獵能系統

Rain-induced vibration energy harvesting using nonlinear plates with piezoelectric integration and power management

Tue, 16 Dec 2025 04:05:25 GMT

title: Rain-induced vibration energy harvesting using nonlinear plates with piezoelectric integration and power management abstract: Vibration energy offers promising potential for renewable energy harvesting, especially in conditions where conventional sources such as solar power may be limited or intermittent. This study proposes a rain energy harvester (REH) that converts the kinetic energy of raindrops into electrical energy using nonlinear thin plates, integrated with piezoelectric elements. Two plate configurations—fully hinged (H-H-H-H) and clamped–hinged–free–hinged (C-H-F-H)—are investigated. Theoretical modeling and simulation results are compared with experimental data, with special attention paid to the role of slapping forces in improving prediction accuracy. A power management system is also introduced to stabilize and regulate the harvested voltage. Results confirm the feasibility of rain-induced energy harvesting, showing potential for application in rain-prone areas and integration with existing infrastructure such as solar panels, tents, or canopies.

Application of machine learning in vibration energy harvesting from rotating machinery using jeffcott rotor model

Tue, 16 Dec 2025 04:05:20 GMT

title: Application of machine learning in vibration energy harvesting from rotating machinery using jeffcott rotor model abstract: This study presents a machine learning-based framework for predicting the electrical output of a vibration energy harvesting system (VEHS) integrated with a Jeffcott rotor model. Vibration induced by rotor imbalance is converted into electrical energy via piezoelectric elements, and the system’s dynamic response is simulated using the fourth-order Runge–Kutta method across varying mass ratios, rotational speeds, and eccentricities. The resulting dataset is validated experimentally with a root-mean-square error below 5%. Three predictive models—Deep Neural Network (DNN), Long Short-Term Memory (LSTM), and eXtreme Gradient Boosting (XGBoost)—are trained and evaluated. While DNN and LSTM yield a high predictive accuracy (R2 > 0.9999), XGBoost achieves comparable accuracy (R2 = 0.9994) with significantly lower computational overhead. The results demonstrate that among the tested models, XGBoost provides the best trade-off between speed and accuracy, achieving R2 > 0.999 while requiring the least training time. These results demonstrate that XGBoost might be particularly suitable for real-time evaluation and edge deployment in rotor-based VEHS, offering a practical balance between speed and precision.

A Bio-Inspired Vibration Energy Harvesting System with Internal Resonance and Slapping Mechanism for Enhanced Low-Frequency Power Generation

Tue, 16 Dec 2025 04:05:13 GMT

title: A Bio-Inspired Vibration Energy Harvesting System with Internal Resonance and Slapping Mechanism for Enhanced Low-Frequency Power Generation abstract: This study presents the development and validation of a bio-inspired vibration energy harvesting system, termed the Bio-Inspired Epiphytic-Plant Slapping Vibration Energy Harvesting System (BIS-VEHS). Inspired by the swaying and slapping behavior of epiphytic plants, the system integrates a circular plate, an elastic beam, a surface-bonded piezoelectric patch (PZT), and a lever-type slapping mechanism to enhance energy conversion. A nonlinear beam model is established and analyzed using the method of multiple scales, through which a 1:3 internal resonance between the first and third bending modes is identified as a key mechanism for promoting energy transfer from higher to lower modes. Time responses are obtained via numerical simulation using the Runge–Kutta method, and the model is validated experimentally. The results confirm that both internal resonance and the slapping mechanism significantly increase the harvested voltage compared with non-resonant and non-slapping configurations. Comparative tests under different excitation modes and plate configurations show good agreement between theory and experiment, with most discrepancies within 10%. These findings demonstrate that the BIS-VEHS is a promising candidate for sustainable low-frequency vibration energy harvesting, particularly for autonomous low-power sensor applications.

基於數值模擬之微型水平軸風力渦輪機風道幾何參數最佳化

Fri, 05 Dec 2025 04:06:02 GMT

title: 基於數值模擬之微型水平軸風力渦輪機風道幾何參數最佳化 abstract: 本研究以數值方法模擬具風道(duct)之微型水平軸風力渦輪機的流場，使用田口方法求得風道幾何參數之最佳化，以提升渦輪機的性能。本風力渦輪機的風道為具法蘭(flange)之收斂-擴散(convergent-divergent)風道，所探討之控制因子包刮：噴嘴長度、噴嘴角度、擴散器角度、法蘭長度和法蘭角度，干擾因子為風速，而要最佳化之目標函數為渦輪機之最大功率係數(maximum power coefficient, CP,max)。田口分析結果顯示，在5個控制因子中，法蘭長度對CP,max的影響最大。在風速為10和16公尺/秒時，最佳風道配置的渦輪機，其CP,max分別為0.77和0.76，分別比最差風道配置的渦輪機的CP,max值高出48.4%和71.4%。此外，經優化的風道幾何形狀，可使喉部流速在10和16公尺/秒的風速條件下，分別提高了67.2%和65.5%。

熱對流學

Wed, 19 Nov 2025 05:50:35 GMT

title: 熱對流學

Numerical Modeling of Particle Dynamics during Dipolarization Events in Substorm Time

Tue, 04 Nov 2025 04:06:00 GMT

title: Numerical Modeling of Particle Dynamics during Dipolarization Events in Substorm Time

Impact of Intermediate Species in Simulating Oblique Detonation with Pre-Vaporized N-Decane/air Mixtures Substituting for Kerosene/Air Mixtures

Tue, 21 Oct 2025 04:05:27 GMT

title: Impact of Intermediate Species in Simulating Oblique Detonation with Pre-Vaporized N-Decane/air Mixtures Substituting for Kerosene/Air Mixtures abstract: A renewed two-step n-decane mechanism is presented to improve reliable and robust simulation results, substituting for kerosene. This mechanism demonstrates that effective control of ignition delay time and heat release, based on the Chapman – Jouguet condition, enables successful simulation of oblique detonation waves. Chain reactions influence the overall reaction heat and explosion temperature, especially in simplified mechanisms with few steps. Therefore, carbon monoxide (CO) generation is crucial for balancing the overall reaction heat and reducing species sensitivity to pressure, a factor previously not discussed in simplified models. The computational time for solving detailed chemical kinetics increases exponentially with species count, driving the pursuit for further reduction in kinetic mechanism size. The sensitive interaction between density and temperature during the fuel/air mixture explosion process affects initiation zone formation and cellular structure. Analyzing the distribution of CO can provide insights into structural details. The study considers applying the Rankine – Hugoniot curve to confirm detonation speeds, temperatures, and kinetic energy changes induced by chemical reactions.

High-Fidelity Simulation of CJ-ODW Initiation and Wave Interactions in JP-10/Air Mixtures Using a Robust Combustion Modelling Method

Tue, 21 Oct 2025 04:05:19 GMT

title: High-Fidelity Simulation of CJ-ODW Initiation and Wave Interactions in JP-10/Air Mixtures Using a Robust Combustion Modelling Method abstract: Jet Propellant 10 (JP-10), a high-energy-density fuel with a complex molecular structure, is widely utilised in advanced propulsion systems owing to its favourable volumetric energy content and thermal stability. This study employs high-fidelity numerical simulations to examine ODWs formed in JP-10/air mixtures, utilising a skeletal mechanism, a reduced mechanism, and a three-step model to analyze shock-induced ignition, heat release rates, and wave interactions. Key features, including the Chapman – Jouguet ODW (CJ-ODW), are investigated to clarify CJ-ODW initiation characteristics. Although CJ-ODWs exhibit lower strength than conventional ODWs, they still achieve the critical CJ conditions for initiation. Moreover, interactions between the first transverse wave and the second oblique shock wave distort the CJ plane, while combustion waves continue heating the reactive mixture. JP-10’s endothermic behaviour during initial breakdown strongly influences this process, creating a characteristic V-shaped temperature gap and altering the reaction front

Enhancing rotor performance of a small-scale drag-type vertical-axis wind turbine with vertical guide vanes through Taguchi optimization

Fri, 19 Sep 2025 04:06:30 GMT

title: Enhancing rotor performance of a small-scale drag-type vertical-axis wind turbine with vertical guide vanes through Taguchi optimization abstract: This study used FlowVision, a commercial CFD software, to simulate the operation of a small-scale drag-type vertical-axis wind turbine with vertical guide vanes. The simulations were conducted ranging from 4 m/s to 8 m/s, which reflects typical conditions for small-scale wind turbines. The rotor blades and guide vanes were optimized using the Taguchi method to improve the rotor performance. In the Taguchi optimization, the control factors investigated were the blade diameter, number of blades, and number of guide vanes. How these factors affect the rotor’s performance was discussed. The results indicated that the number of guide vanes most significantly influenced the rotor rotation of the investigated control factors. The blades and the guide vanes exhibited significant interactions. The guide vanes functioned as flow augmenters, directing and accelerating incoming airflow into the rotor. They also shield incoming airflow to prevent it from affecting the returning blades. However, using an excessive number of guide vanes may result in low rotor speed. The optimum wind turbine configuration was 8 blades, blades with D/Dr = 0.25 in diameter, and 6 guide vanes. The maximum power coefficient CP,max for the optimum configuration was 55.56% higher than that for the worst configuration.