Abstract
Fans are dominant noise source of computer equipments. Their noise can be reduced effectively by louvers with absorbing materials. In order to optimize their noise reduction performance, insertion loss of a louver is simulated by boundary element method (BEM). In this simulation, incoherent vibrating surfaces are used to simulate fan noise sources. Acoustic impedance of a multi-layered absorptive material is calculated using transfer matrix method. Results show that the simulated overall noise agrees with the measurement within 1 dB.
