초록 ▼

A variable frequency vibration absorber adapted to be fixedly mounted in a fixed vibration prone system to coact with the system principal vibration excitation source to control system vibration. The vibration absorber is bifilar in construction and the natural frequency thereof is varied in proport

A variable frequency vibration absorber adapted to be fixedly mounted in a fixed vibration prone system to coact with the system principal vibration excitation source to control system vibration. The vibration absorber is bifilar in construction and the natural frequency thereof is varied in proportion to the frequency of the vibration being generated by the principal system excitation source.

대표청구항 ▼

A variable frequency vibration absorber adapted to be fixedly attached to a vibration prone system to cooperate with the principal vibration excitation source which primarily generates vibrations in a given direction so as to control system vibrations and comprising: base means, two mass means of se

A variable frequency vibration absorber adapted to be fixedly attached to a vibration prone system to cooperate with the principal vibration excitation source which primarily generates vibrations in a given direction so as to control system vibrations and comprising: base means, two mass means of selected equal mass, pendular connecting means having a pendular arm of length “a”connecting said mass means in opposed positions to said base means for support from and allochiral, pendular motion in said given direction, spring means operatively connected to said mass means in preloaded condition to exert a force “Fnr”on said mass means to thereby establish the natural frequency thereof and of the vibration absorber, and to also cause said mass means to move in coincident, allochiral pendular motion so that motion of said mass means produces additive forces in said given direction to absorb the vibration force established by said principal source, and so that all other forces so produced mutually cancel, said spring means also being of selected spring rate “Ks”to compensate for the spring rate reduction caused by pendular motion of the pendular connecting means and said mass means and thereby provide an essentially linear spring rate acting on said mass means for angles of pendular motion “q±45°, so that the natural frequency of the vibration absorber is substantially constant throughout this range of operation, and wherein “Ks”is selected according to the equation: [Figure] control means responsive to the frequency of the vibrations generated by the principal vibration excitation source and operatively connected to said spring means to vary the force exerted thereby and thereby the natural frequency of said mass means as a function of the vibration frequency generated by said excitation source to thereby maintain the proper relationship between the mass means natural frequency and the principal source generated frequency to control system vibration.