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Enhancement of Ultrasonic De-Icing via Tone Burst Excitation

机译：通过音调激发增强超声除冰

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摘要

Previous ultrasonic de-icing research on rotorcraft has demonstrated that applying multifrequency burst actuation schemes has increased the ice protection area coverage of the system. The physical mechanisms responsible for this increase in de-icing performance are modeled using finite elements and tested using both freezer ice and impact ice in the Adverse Environment Rotor Test Stand facility at the Pennsylvania State University. Freezer ice was tested using a 0.035-in.-thick (0.889-mm-thick) titanium grade 2 plate. Impact ice testing was conducted using a 0.035-in.-thick (0.889-mm-thick) stainless steel NACA 0015 airfoil structure (16 in. or 40.64 cm chord). It is proven that the increase in ice shedding area when using multifrequency tone bursts is due to the transient nature of the excitation and not the multimode control of the structure at varying frequencies surrounding the resonance of the structure. During bench-top testing using freezer ice, ultrasonic burst actuation techniques that exploit transient vibrations showed to increase the de-icing performance (as quantified by the ice shedding area) by a factor of 4 when compared to continuous actuation methods. The benefits of tone burst actuation were as large as 10 times that of continuous frequency actuation when testing rotor impact ice affected by centrifugal loads.
机译：先前在旋翼机上进行的超声波除冰研究表明，采用多频脉冲驱动方案可增加系统的防冰区覆盖范围。导致这种除冰性能提高的物理机制是使用有限元建模的，并在宾夕法尼亚州立大学的逆向环境转子试验台设施中使用冷冻冰和冲击冰进行了测试。使用0.035英寸厚（0.889毫米厚）的2级钛板测试冰箱的冰。冲击冰测试使用的厚度为0.035英寸（0.889毫米）不锈钢NACA 0015翼型结构（弦长为16英寸或40.64厘米）。业已证明，使用多频音突发时，冰块脱落面积的增加是由于激发的瞬态特性引起的，而不是结构周围共振发生变化的频率下结构的多模控制所致。在使用冷冻冰的台式测试过程中，利用瞬态振动的超声波爆破作动技术显示，与连续作动方法相比，除冰性能（按结冰面积量化）提高了4倍。在测试受离心载荷影响的转子撞击冰时，音调爆裂启动的好处是连续频率启动的好处的10倍之多。

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  • 来源
    《Journal of Aircraft》 |2016年第6期|1821-1829|共9页
  • 作者

    DiPlacido Nicola; Soltis Jared; Palacios Jose;

  • 作者单位

    Penn State Univ, Dept Engn Sci & Mech, 227 Hammond Bldg, University Pk, PA 16802 USA;

    Penn State Univ, Dept Engn Sci & Mech, 227 Hammond Bldg, University Pk, PA 16802 USA;

    Penn State Univ, Dept Aerosp Engn, University Pk, PA 16802 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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