Multi-class algorithm based on Support Vector Machines, which is also called as Decision Directed Acyclic Graph method, is used for ventilator faults diagnosis in order to diagnose the vibration faults of centrifugal ventilator and improve ventilator run security and economical efficiency. Results indicate that the method is a novel means to ventilator faults diagnosis, which can not only diagnose common vibration faults accurately but also it has some features which are faster diagnosis rate and higher accuracy.
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