管道低频噪声主动控制系统的DSP实现-仪器科学与技术专业论文.docxVIP

Ab Abstract - - II - Abstract With the development of modern industry, noise pollution has become one of the worlds three, affecting peoples production and life. Adopt ing effective manner noising become a hot issue of concern .Active noise control technology is more rapid development in recent years of research. Active noise control technology is mainly used to eliminate low frequency noise, especially in regard to eliminate low-frequency narrowband noise strong competitive advantage. In practical applications, the narrowband low-active noise control is mainly used in rotating machinery such as periodic motion of large-scale equipment, and these devices are mostly noise generated by piping. Therefore, for the pipeline to eliminate low frequency noise is significance. The main contents are as follows: Described the theoretical basis for active noise control and active noise control system structure, introduced the adaptive filter structure a nd the advantages and disadvantages of various types of control algorithms ANC. Designed the ANC controller, including the ANC control algorithm arithmetic unit, analog input and output units and peripheral equipment selection and connection. Designed a one-dimensional long straight duct ANC system noise propagation environment. The pipeline can be simplified acoustic propagation environment favorable noise cancellation ANC system testing. Dased on the traditional FXLMS algorithm software program, designed to incorporate variable step size FXLMS algorithm procedures, and analyzes the variable step size algorithm in ANC actual system advantages and disadvantages. Carried out several groups of different frequency noise cancellation ANC system experiments and variable step size algorithm for de-noising experiments, analysis of experimental results and the problems encountered in the experiment gives the corresponding solutions. Keywords: Low-noise pipeline, active noise control, Variable step size algorithm FXLMS, DM642 目 目 录 - -