同軸雙旋翼無人機之複材旋翼流固耦合分析

Fluid-Structural Analysis of Composite Rotors in a Coaxial UAV Helicopter

陳重德(Chung-De Chen) ； 賴柏瑞(Bo-rui Lai)

《先進工程學刊》 13卷1期 (2018/04) Pp. 27-34

摘要

同軸雙旋翼無人機(UAV)因具有體積小、控制性與機動性較佳等特點，比其他類型的旋翼機更適合都會區執行任務，因此近年來逐漸受到重視。本研究針對同軸雙旋翼機，分析其旋翼之特性，包括模態振動分析，以及流固耦合分析。分析結果顯示，旋翼之第一模態之變形主要為彎曲，因此複材疊層之設計以單軸向為主，編織型為輔，且在接近翼根部分疊層厚度較厚，接近翼尖部分則較薄。在單向流固耦分析方面，旋翼升力因上下旋翼交會及錯開呈週期性變化，下旋翼受下洗氣流影響升力小於上旋翼。本研究對旋翼之振動及氣動力分析結果，可提供同軸雙旋翼之設計參考。

關鍵字

同軸雙旋翼無人機 ； 模態分析 ； 流固耦合分析

並列摘要

The coaxial UAV rotors have received attentions because of their compact size and mobility. They are widely used for missions in urban areas with high density in buildings. For the rotor blade design, the NACA0012 is adopted. For such cross section, the thickness is very thin compared with the chord length so that the vibration behaviors are similar cantilever beams. To increase the natural frequency, the design for varying thickness of the composite is adopted. The analysis considering the structural-fluid interaction is performed to obtain the lift force and the deformation of the blade. The analysis results proposed in this study can be used as a guideline to avoid structural resonance.

並列關鍵字

coaxial UAV rotor ； modal analysis ； fluid-solid interaction analysis