Otimização de uma bancada experimental para fins de análise de neutralizadores dinâmicos de vibrações

Abstract

The vibration control is necessary in several mechanical projects in order to reduce the mechanical failure occurrence. The most common used technics of vibration control are passive, ie, it works adding inertia, stiffness and damping elements to the system. In this context two technics are noteworthy: Vibration neutralizer and vibration isolation. Vibrations neutralizers are widely used to vibration attenuation, acting directly on the system’s response amplitude, mainly in the bandwidth where the phenomenon of resonance occurs. Vibration isolation is applied to reduce the transmitted force to the system and its components and the foundation where the system is fixed. The analyzed system was an experimental bench of UTFPR’s vibration laboratory. The experimental bench was divided into two subsystems where a vibration control technic was applied in each one. The first subsystem consists of a cantilever beam of variable length excited by an electrical motor with rotating unbalance where several metallic bars have been studied in order to evaluate their ability to act as neutralizers. The second subsystem consists of the global experimental bench, in which is intended to install vibration isolators on its base to reduce the vibrations generated by the electrical motor.