Reduction of the Radiated Sound Using the Acoustic Prediction Filter

Abstract

In this paper, reduction of the radiated sound from a vibrating rectangular plate is studied using the Acoustic Prediction Filter to estimate the radiated sound using the acceleration signals of the plate. A piezoceramic transducer (PZT) is used as an actuator to reduce the vibration and the radiated sound. To maximize the control performance, each PZT actuator is located at the position that has the largest control sensitivity of the plate bending moment in the direction of x and y coordinates and the optimal PZT location is validated experimentally. To find the acoustic prediction filter accurately, two accelerometers are located at the positions that have the largest radiation efficiencies of the plate, and the proposed locations are validated by simulation using the Rayleigh integral. The multichannel filtered-x LMS algorithm is introduced to control a complex 2-D structural vibration mode. The control system using the acoustic prediction filter is presented and validated by experiments using a real time control system.

Structure borne noise control of a clamped panel using shunt damping system

“…(4) Finally, at the target frequency the vibration and noise were experimentally reduced by up to 8 dB and 9 dB(A) respectively due to the PZT shunt damping system. Table 3 Comparison of modal assurance criterion value Mode Modal assurance criterion (MAC) value (1,1) 0.908 (1,2) 0.921 (2,1) 0.852 (1,3) 0.825 (2,2) 0.947 (2,3) 0.941 (3,1) 0.935 (1,4) 0.916 (3,2) 0.904 (2,4) 0.956 (3,3) 0.946 (1,5) 0.918 (3,4) 0.905 (2,5) 0.911 (4,3) 0.907 (1,6) 0.938 …”

“…An analysis of natural frequencies and vibration levels indicated that the PZT in case 2 were most efficient. Thus, the case 2 attaching position of PZT for mode (3,1) should be determined for a PZT shunt damping system to control the structural borne noise of the panel. In consideration of system commercialization and high-performance control the PZT was attached in the vertical direction as shown in Figure 12.…”

“…Control methods using piezoelectric materials require fewer spatial changes and also were able to obtain a better effective performance for noise control in the low frequency region. Piezoelectric materials also have advantages in terms of distribution characteristics, price, efficiency, and volume compared to other existing materials [2,3]. The active vibration control (AVC) using PZT materials was proven to be effective when applied to a simple beam.…”

Active Structural Acoustic Control of a Softcore Sandwich Panel Using Multiple Piezoelectric Actuators and Reddy's Higher Order Theory

“…Control of sound transmission through flexible panels generally carried out by active structural acoustic control (ASAC) in which the radiated sound is controlled using one or several control actuators applied directly on the vibrating structure [9][10][11]. The benefits of ASAC over traditional sound field control using a speaker arrangement are associated with the control of sound at the source and the system compactness.…”

“…2k = I 2k − 2c 1s I 4k + c 2 1s I 6k , J rk = I rk − c 1s I (r + 2)k , I rk = r = 0,1,..6 (11). and N 2pe = I 2pe − 2c 1s I 4pe + c 2…”