碩士生: 連偉成
畢業年分: 2025年3月
論文名稱: 適用於脈衝式電漿推進器之推力平台的研發與衝量量測(中文) / Development and impulse measurement of a thrust stand for pulsed plasma thrusters (英文)
中文摘要:
測量脈衝電漿推進器（Pulsed Plasma Thruster, PPT）的脈衝推力一直是一項挑戰，主要原因在於其推力水平較低且放電時間極短。為解決此問題，本研究開發了一種正單擺式推力平台，以實現高精度的脈衝測量。該測量平台整合了電力梳（Electrostatic Comb, ESC）校準系統、渦電流阻尼器以及高精度雷射位移感測器，以確保測量結果的準確性與可重現性。
校準結果顯示，電纜引起的寄生剛度與阻尼效應會影響彈簧常數與阻尼係數，導致測量偏差。此外，不確定性分析顯示，ESC 系統的脈衝寬度變化是主要的誤差來源並導致其量測推進器衝量的總不確定性達到29.83%。
實驗結果表明，在不同輸入能量條件下，PPT 的脈衝測量結果呈現線性關係，其能量轉換效率為 2.92 µN·s/J。未來的改進方向將著重於降低 ESC 脈衝寬度的變化，並優化電纜管理，以提升推力測量平台的精度。
英文摘要:
Accurately measuring the impulse bit of Pulsed Plasma Thrusters (PPTs) remains a challenge due to their low thrust levels and short discharge durations. To address this, a hanging pendulum thrust stand was developed for precise impulse measurements. The stand incorporates an Electrostatic Comb (ESC) calibration system, an eddy current damping mechanism, and a high-precision laser displacement sensor to ensure accurate and repeatable results.
Calibration revealed that cable-induced parasitic stiffness and damping affected the spring constant and damping coefficient, contributing to measurement deviations. Uncertainty analysis identified pulse width variations in the ESC system as the primary source of error, with additional uncertainties arising from mechanical interactions between electrical wiring and the pendulum arm. The total uncertainty can come to 29.83%.
Experimental results of PPT’s impulse measurement of different input energy confirmed a linear relationship between input energy and impulse, with an energy-to-impulse conversion ratio of 2.92 µN·s/J. Future improvements will focus on reducing ESC pulse width variations and optimizing cable management to enhance measurement accuracy of thrust stand.
