Research On Active Noise Control Of The Indoor Unit Of Household Air-conditioner

With improvement of people's living and working surroundings' quality,household air-conditioner has become one of the most important domestic appliances.At the same time,the noise problem of household air-conditioner has also becom e more and more important.Passive noise reduction can elim inate most of the m edium-high frequency noise,but low frequency noise which is m ore harmful.Active noise control has a better noise elimination performance on narrowban d low frequency instead of single low frequency.In this paper,the research is focus on active noise control for the indoor unit of household air-conditioner.Firstly,the perf ormance of adaptiv e filtering algorithm is analyzed by sim ulate convergence speed and noise red uction with difference filter len gth,convergent coefficient and secondary-path transfer function accuracy.At the second stage,the characteristics of noise and sound field of indoor unit is analyzed by designing test schem e and testing.The active noise control hardw are system is built by selecting hardware,designing function,matching module,configuring mode etc.Active noise control hardware system is arranged according to the characteristics of sound field and theoretical calculation.Finally,the performance is com pared between linear and n onlinear filter adaptive algorithm for feedback system.The perform ance of secondary-pat h identification is compared between adaptive algorithm and simplex m ethod.The ef fect of noise reduction is tested by loading to the hardware system.