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Abstract In order to solve the problem of ventilation instability in the joint operation of multi-air shafts in large and complex mines, this paper analyzes the stability evolution mechanism of multi-air shaft system from the perspective of system engineering and fluid dynamics, and reveals the instability mechanism of coupling effect of public air path, dynamic drift of main fan operating point and local airflow reversal. A coordinated control strategy based on ubiquitous sensing, digital twin and global decoupling optimization is constructed, and the global optimization of the system is realized through the coordinated implementation of main fan frequency conversion and intelligent air door. The engineering practice shows that the strategy can eliminate the surge risk of the main fan, stabilize the matching degree of air volume supply and demand at 98% ~ 105%, and the energy saving rate of comprehensive ventilation is 18.3 %. The research provides a theoretical basis and engineering paradigm for the construction of intelligent ventilation in large mines.
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