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Inverse identification of multiple temporal sources releasing the same tracer gaseous pollutant

机译：释放相同示踪气态污染物的多个时间源的逆向识别

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When an accidental release of indoor airborne pollutants occurs, it is critical to promptly identify the pollutant sources. Current inverse models concentrate on the identification of a single pollutant source or multiple pollutant sources in a simplified puff or constant release scenarios. This investigation proposes an inverse model to precisely determine the locations and temporal release rate profiles of multiple sources releasing the same tracer gaseous pollutant. The model first constitutes a number of candidate group sources by assuming known release positions. Then Tikhonov-based matrix inversion is implemented to solve for the release rate profiles of each candidate group of sources. The concentrations provided by the sensors in the same number of the isolated sources are the known inputs for the matrix inversion. As for the multiple candidate group sources, the occurrence probability of each group is determined by the Bayesian model after matching the concentration with one additional sensor. The above strategy was applied to identify the same pollutant accidentally released by two passengers in a three-dimensional aircraft cabin. The pollutant was from the exhalation points and discharged in an intermittent sinusoidal wave and a square wave of ten seconds, respectively. The results show that the proposed method can correctly determine the locations of multiple temporally released sources. The relative errors between the inversely identified release rates and the CFD-simulated actual rates are generally less than 15%. (C) 2017 Elsevier Ltd. All rights reserved.
机译：当室内空气中污染物的意外释放发生时，及时识别污染物来源至关重要。当前的逆模型集中于在简化的抽吸或持续释放的情况下识别单个污染物源或多个污染物源。这项研究提出了一个逆模型，以精确确定释放相同示踪气态污染物的多个污染源的位置和时间释放速率曲线。该模型首先通过假定已知的释放位置构成许多候选组源。然后，基于Tikhonov的矩阵求逆被实现，以求解每个候选源组的释放速率曲线。由传感器在相同数量的隔离源中提供的浓度是矩阵求逆的已知输入。对于多个候选组源，在将浓度与一个附加传感器匹配后，由贝叶斯模型确定每个组的出现概率。应用上述策略来识别两名乘客在三维机舱中意外释放的相同污染物。污染物来自呼气点，分别以间歇性正弦波和十秒钟的方波排放。结果表明，该方法可以正确确定多个时间释放源的位置。反向确定的释放速率与CFD模拟的实际速率之间的相对误差通常小于15％。 （C）2017 Elsevier Ltd.保留所有权利。

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