Vibration control by attaching masses to a plate excited by

CURADELLI, OSCAR; AMBROSINI, DANIEL; DANESI, RODOLFO

JOURNAL OF SOUND AND VIBRATION

Elsevier

Lugar: U.K.; Año: 2004 vol. 273 p. 1087 - 1100

0022-460X

In general, the vibrations produced by rotating machinery are reduced or mitigated by means of traditional systems of base isolation such as springs or viscoelastic materials. However, in many cases of rotating machines supported on plate structures it would not be possible or convenient to use this alternative of isolation. For example, consider machines not initially isolated that for any change in the support structure or the operating conditions produce unexpected high levels of vibrations. Moreover, it is inconvenient to stop the machine to install a base isolation system. In these cases, an attractive alternative is to use masses incorporated to the support structure. The main objective of this paper is to compare the efficiency of vibration control systems of rotating machinery, in order to present alternatives for traditional systems, mainly based on base isolation by using helical spring or viscoelastic materials. According to this objective, an experimental and numerical study is presented considering as an alternative system of mitigation of vibration the incorporation of masses on the support structure. Masses of 5%, 10% and 15% of the total mass of the vibrating machinery are included in the analysis. A set of tests concerning a case study on the spring (traditional) and masses (alternative) vibration control systems is presented. The acceleration time histories in different points are recorded. On the other hand, a numerical analysis using a finite element program [13] was carried out. of the total mass of the vibrating machinery are included in the analysis. A set of tests concerning a case study on the spring (traditional) and masses (alternative) vibration control systems is presented. The acceleration time histories in different points are recorded. On the other hand, a numerical analysis using a finite element program [13] was carried out.