Design and Development of Active Dynamic Vibration Absorber

摘要

One of the important methods by which -vibrations of a machine are reduced is by the use of a vibration absorber. This paper presents the design and development of a semi-active dynamic vibration absorber. The uniqueness of the design lies in coupling of tuned resonant device and actuating mechanism. This paper discusses the concept, design and experimental results of a vibration absorber mechanism. The solenoid valves with plunger and spring arrangements have been used to keep absorber mass fixed with the beam. The sequential control, i.e., the energisation/de-energisation of solenoids coupled with the drive steps for the stepper motor (both clockwise and anti-clock directions) has been executed using a PC based software. The necessary drive circuits for stepper motor and solenoid valves have also been developed, The absorber is best for those machines, which run at variable speeds, but remain at a particular speed for a considerable amount of time. Interestingly this arrangement converts the system into a system with three-degree-of freedom. From the analysis of the system, it is noted that one of the natural frequencies of this mechanism is that of the absorber but no resonant conditions are created at this frequency.