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Source location of acoustic emission in diesel engines

机译：柴油发动机声发射的源位置

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This paper is the third in a series developing methods of mapping acoustic emission (AE) signals and wave propagation in engines and focuses on source location techniques for the multi-source signals on relatively complex structures typical of machinery applications. Two source location techniques, a traditional wave velocity-based and an AE energy-based technique, using triangular sensor arrays, are used to locate source positions on the cylinder head of a 74 kW diesel engine using simulated sources (pencil lead break) and real sources (e.g. injectors (INJs) and exhaust valves during engine running).rnSource location using both techniques is demonstrated on the cylinder head of a 74 kW four-stroke diesel engine. The velocity-based technique uses AE wave speeds and time-of-flight (wave arrival time) to locate source position and is found to be most effective for single source signals with a sharp rising edge and good signal to noise ratios. The energy-based technique is based on a simple absorption attenuation model and was found to be useful for multiple source signals such as INJ signals, although structure-specific attenuation coefficients need to be measured for accurate source location.
机译：本文是在发动机中映射声发射（AE）信号和波传播的系列开发方法中的第三篇，重点介绍了在机械应用中相对复杂的结构上针对多源信号的源定位技术。使用三角传感器阵列的两种源定位技术，即传统的基于波速和基于AE能量的技术，用于使用模拟源（铅笔超前断开）和实际源来定位74 kW柴油机气缸盖上的源位置。来源（例如发动机运行期间的喷射器（INJ）和排气门）。在74 kW四冲程柴油发动机的气缸盖上演示了使用这两种技术的来源位置。基于速度的技术使用AE波速和飞行时间（波到达时间）来定位源位置，并且发现它对于具有陡峭上升沿和良好信噪比的单个源信号最有效。基于能量的技术基于简单的吸收衰减模型，并且发现它对于多个源信号（例如INJ信号）很有用，尽管需要测量特定于结构的衰减系数以实现精确的源定位。

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