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CFD analysis of a transfer matrix of exhaust muffler with mean flow and prediction of exhaust noise

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第9期13卷 709-716页

作者： Lian-yun LIU Zhi-yong HAO Chi LIU Department of Energy Engineering Zhejiang UniversityHangzhou 310027China

A multi-dimensional computational fluid dynamics(CFD) approach was proposed in this study aiming to calculate the transfer matrix of an engine exhaust muffler in the conditions with and without mean *** CFD model of the muffler with absorptive material defined as porous zone was calibrated with the measured noise reduction without mean flow,and was further employed to study the effect of the mean flow on the acoustic performance of the ***,the exhaust acoustical source was derived from the calculated transfer matrices of six different additional acoustic loads obtained by the proposed CFD approach as well as the measured tail noise based on a multiload least squares ***,the exhaust noise was predicted based on Thevenin's *** proposed CFD approach was suggested to be able to predict the acoustic performance of a complex muffler considering mean flow(without and with mean flow) and heat transfer,and provide reasonable results of the exhaust noise.

关键词： Computational fluid dynamics (CFD) Transfer matrix Mean flow Acoustical source exhaust noise

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Active noise Control for Vehicle exhaust noise Reduction

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Tsinghua Science and Technology 2003年第5期8卷 577-581页

作者：李克强杨殿阁郑四发连小珉田中丈晴 State Key Laboratory of Automotive Safety and Energy Environment and Energy Research Division

An active noise control (ANC) method was developed for exhaust noise reduction for medium-duty diesel trucks. A modified variable step size least mean squares (LMS) algorithm was used for the controller in a variable environment that considered the vehicle's acceleration characteristics. The variable step size time-based synchronized filtered-x LMS method (SFX-TB) used an adaptive algorithm that was more efficient than the conventional filtered-x LMS algorithm. The simulation and the experimental tests show that the control trackability and stability provided by the algorithm during acceleration enable the ANC system to effectively reduce the vehicle exhaust noise.

关键词： active noise control exhaust noise acceleration characteristics step size

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Attenuation Effect of Expansion Configuration and Acoustic Material on Propagation of Blast Waves in a Duct

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Journal of Flow Control, Measurement & Visualization 2016年第3期4卷 79-92页

作者： Motonobu Ishiguro Kenji Shinkai Ryo Shimamura Hironobu Gunji Yoko Takakura Course of Mechanical Engineering Graduate School of Engineering Tokai University Kanagawa Japan Department of Prime Mover Engineering Tokai University Kanagawa Japan

With recent increase of cars, the noise problem has been caused by the exhaust sounds released from exhaust pipes, which consist of weak and pulsed shock waves called blast waves. To diminish the noise, a silencer is set up in front of the exhaust pipe. In the present study, reflectors were installed in the high-pressure section of the shock tube to generate blast waves, and three types of expansion region were investigated, combined with acoustic material of glass wool. The pressure decay was evaluated by transmission factor and reflection factor for the incident blast wave, together with pressure histories and high-speed Schlieren photography. As results, it was confirmed that the acoustic material greatly contributed to blast-wave attenuation: the one stage expansion model with glass wool recorded the highest decay of the peak over pressure for transmission, and other models with glass wool showed the second highest. The acoustic material also contributed to decay of reflected shock waves propagating toward an upstream duct.

关键词： Blast Wave Shock Tube exhaust noise Decay Factor Silencer Model Acoustic Material

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