Category: 1. Introduction

Depending on their time histories, noise and vibration signals can basically be divided into stationary and nonstationary. Examples of the various types of signals in the time and frequency domains are shown in Figure 1.1 [10].

Real‐world problems in the control of noise and vibration in aircraft, appliances, buildings, industry, and vehicles require the measurement of particular environmental parameters such as sound pressure, force, acceleration, velocity, displacement, etc. This process is often performed by using acoustical and vibration transducers. Vibration and acoustical sensors are transducers which convert a measured physical property…