Frequency-adaptive leaf-spring tuned mass damper
AssigneeFM Energie GmbH & Co. KG
InventorFranz Mitsch
Life of this patent
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Abstract
The invention relates to a tuned mass damper or vibration damper which, with the aid of an assembly (2) of a plurality of stacked, specially shaped or bent leaf springs (2.1), can be adapted over a certain range to the disturbance frequencies acting on a component to be damped or of the vibration system to be damped, the position of the damper mass (1, 34) being changed essentially only slightly. The invention relates in particular to one- and two-dimensionally effective tuned mass dampers. The tuned mass dampers according to the invention are suitable in particular for installations, vehicles and machines that undergo frequent changes in rotational speed, resulting frequently in disturbance frequencies that become noticeable, in particular, in the form of structure-borne sound, or other vibrations.
Claims22
A one-or two-dimensionally effective tuned mass damper for a vibration system, which is adaptable to disturbance frequencies, comprising a machine, a vehicle, or an installation, which is exposed to said disturbance frequencies to be damped, adaptive tuned mass damper comprising
- (i) a damper mass,
- (ii) at least one leaf-spring assembly capable of vibrating in case of force flows, the leaf-spring assembly is firmly connected directly or indirectly to a support unit of said machine or installation and directly or indirectly to the damper mass and has a predetermined stiffness, and
- (iii) a device for changing the predetermined stiffness of the leaf-spring assembly and adjusting the frequency of the vibration system to the disturbance frequencies, the device for changing the predetermined stiffness being connected both to the leaf-spring assembly as well as to the support unit of the vibration system,
- wherein
- (iv) the at least one leaf-spring assembly has one or more leaf-springs stacked in parallel, which are pre-bent about a transverse axis thereof in a force-free state, a longitudinal axis of the leaf-springs or the leaf-spring assembly being defined by a direction of force applied during operation,
- (v) two end or clamping regions of the individual leaf-springs or the leaf-spring assembly are deflected or offset relative to one another by a defined, preset amount with respect to their position in relation to the longitudinal axis, said predetermined deflection corresponding to a specific stiffness of the leaf-spring assembly and a specific frequency of the vibration system connected to the leaf-spring assembly, and
- (vi) the device for changing the predetermined stiffness comprises a displacement device, a rotary device, a piezo element, or a bimetallic element is designed and arranged such that it allows a reversible bending of the pre-bent leaf-spring assembly in a direction perpendicular to the longitudinal axis, such that depending on the direction of displacement or rotation by the device for changing the predetermined stiffness, an increase or decrease in the preset deflection of the pre-bent leaf-spring assembly is achieved, whereby the predetermined stiffness of the leaf-spring assembly is changeable along the longitudinal axis and the frequency of the vibration system is adaptable to a changed disturbance frequency.
Dependencies are inferred from the claim text.