Spectral Analysis of Macro-Fiber Composites Measured Vibration of Double-Panel Structure Coupled with Solenoids

Abstract

Noise may have a negative impact on humans health and well being. Noise is a direct result of the vibration of structures. Many industrial workers and people using household appliances may be exposed to these harmful factors. To minimize their negative consequences, different approaches to noise and vibration reduction may be applied, e.g., active, semi-active or passive methods. In this research, a semi-active approach to vibration reduction of a cubic rigid casing enclosing a noise- and vibration-generating device is presented. One of the casing walls consists of double thin steel panels, coupled with the use of electromagnetic dampers—solenoids installed in the space between the panels. Other casing walls are built of single plywood panels. Vibrations of the outer (radiating) panel of the wall are measured by Macro-Fiber Composite patches. Spectral analysis of structure vibration is carried out to identify the benefits of the proposed coupling solution in terms of vibration reduction of the wall. The frequency range, where vibration reduction is observed, depends on the number of activated solenoids and the duty cycle of a Pulse Width Modulation (PWM) signal. Advantages and drawbacks of the proposed method are discussed and future improvements of the examined setup are suggested.

Vibroacoustical Performance Analysis of a Rigid Device Casing with Piezoelectric Shunt Damping

“…The examined part is a 1.0 mm aluminum plate, mounted as a front wall on a rigid, heavy frame, employed in previous research conducted by the authors [18,20,52]. The plate is clamped using twenty screws and by an additional square frame, to provide boundary conditions close to fully clamped.…”

“…The authors employed a passive aproach in the rigid casing with the use of a shunt system, based on SSD on Inductor (SSDI) control law [18]. Recently, the authors examined the rigid casing coupled with the use of electromagnetic elements, where spectral analysis of vibration was conducted based on Macro Fiber Composites (MFC) measurements [52].…”