The paper presents concepts related to analysis of mechanical vibrations of a squirrel-cage induction motor. It describes an experimental approach using piezoelectric accelerometer and analog/digital data acquisition tools. The influence of powering the motor with an inverter on vibration harmonic content is presented and different PWM switching frequencies are compared to regular line supply.
High-speed crafts’ reliability as well as its passenger’s comfort and safety are closely related to the craft’s dynamics on sea waves. The resultant dynamics are governed by the quality of the motion control system and its capacity for quality kinematic data acquisition. Herein, we propose a novel method for determining accelerometers’ mounting positions within a hydrofoil ship. This method eliminates interference from the output of accelerometers and provides the capability of determining the amplification coefficients of the second derivative with respect to the height of the ship’s motion.