based on fans fault system analysis, imbalance and unalignment two fault is carried out on gb4-73no . 8d test-bed . vibration test is carried out on vary rotate speed diffuser coupling and throttle . data file is analyzed by matlab function, then effect of imbalance and unalignment according to vary factor is found 根據(jù)對通風機故障的系統(tǒng)分析,決定在gb4-73no.8d通風機試驗臺上進行不平衡和不對中兩種故障,在不同轉速、不同導流器開度和不同節(jié)流錐阻力的各種工況下進行振動試驗,用編寫的matlab程序對數(shù)據(jù)文件進行分析,得到不同因素對不平衡和不對中故障的影響。