Abstract
An ANC method for exhaust noise reduction of a medium-duty diesel truck is presented in this paper. To ensure the successful operation of its controller in a time-varying environment, a modified, variable step size LMS algorithm is proposed by considering vehicles acceleration characteristics . The variable step size SFX-TB method is developed to devise an adaptive algorithm more efficient than the conventional filtered-x LMS algorithm. After investigating the features of control trackability and stability under accelerated running condition, the practical application of the ANC system for vehicle exhaust noise reduction is introduced.