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火灾早期阴燃状态下,释放热量少,却产生大量的烟气,而风场中烟气的传播除了受自身的各向同性扩散影响外,更主要是受外界风的影响。基于斜风场中的气体浓度衰减模型,利用空间分布传感器对火灾源点进行定位,并提出了一种加权距离差法来修正定位误差。该方法首先确定每个传感器对应的估计范围(集合),然后通过寻求所有集合的交集来估计出火源点位置。结果表明,该方法不仅能提高定位精度,而且克服了迭代算法难收敛问题,具有实现简单,运行稳定的优点。
In the early smoldering state of the fire, less heat was released, but a large amount of flue gas was generated. In addition to being affected by its own isotropic diffusion, the spread of flue gas in the wind field was mainly affected by the external wind. Based on the gas concentration attenuation model in the gale-wind field, the spatial distribution sensor is used to locate the fire source point and a weighted distance difference method is proposed to correct the positioning error. The method first determines the estimated range (set) for each sensor and then estimates the location of the fire source by seeking the intersection of all sets. The results show that this method can not only improve the positioning accuracy, but also overcome the difficult convergence problem of the iterative algorithm, which has the advantages of simple implementation and stable operation.