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首页> 外文期刊>Mechatronics, IEEE/ASME Transactions on >Accelerometer-Based Acoustic Control: Enabling Auscultation on a Black Hawk Helicopter
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Accelerometer-Based Acoustic Control: Enabling Auscultation on a Black Hawk Helicopter

机译：基于加速度计的声学控制：在黑鹰直升机上启用听诊

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摘要

During aeromedical patient transport, acoustic noise levels in excess of 90 dB make auscultation with a stethoscope virtually impossible. Existing approaches to address this noise in literature have relied on the use of either passive shielding of the stethoscope sensing element or active noise cancellation (ANC) with the use of additional reference microphone sensors. These solutions have achieved inadequate performance. In this paper, custom instrumented stethoscopes are used to obtain structural vibration and acoustic data from a UH-60 Black Hawk helicopter. The data show that the structural vibrations contribute significantly more to stethoscope signals than air-borne acoustic noise. Therefore, a novel adaptive acoustic control system using a reference accelerometer is pursued. By varying the levels of acoustic and vibrational noise sources in a controlled laboratory environment, the benefits and limitations of microphone or accelerometer-based active noise control are investigated and compared. Experimentally simulating the field acoustic and vibration characteristics of the UH-60 Black Hawk helicopter, the accelerometer-based ANC system is shown to provide significantly superior performance. The accelerometer-based ANC system yields an average 25-dB reduction in ambient noise levels over the entire relevant frequency range, thereby enabling successful auscultation for the first time in this military aircraft environment.
机译：在航空病人的运输过程中，超过90 dB的声级使得使用听诊器听诊几乎是不可能的。解决文献中的这种噪声的现有方法依赖于听诊器感测元件的无源屏蔽的使用或附加的参考麦克风传感器的有源噪声消除（ANC）的使用。这些解决方案已实现性能不足。在本文中，使用定制仪器听诊器从UH-60黑鹰直升机获得结构振动和声学数据。数据表明，结构振动对听诊器信号的贡献远大于空气传播的噪声。因此，追求使用参考加速度计的新颖的自适应声学控制系统。通过在受控实验室环境中改变声学和振动噪声源的级别，研究并比较了基于麦克风或基于加速度计的有源噪声控制的优点和局限性。通过实验模拟UH-60黑鹰直升机的场声和振动特性，基于加速度计的ANC系统显示出显着的优越性能。基于加速度计的ANC系统可在整个相关频率范围内平均降低25 dB的环境噪声水平，从而首次在这种军用飞机环境中成功进行听诊。

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