Vibration Reduction Device for Enhanced Noise Control
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Summary
Problems
Existing vibration reduction systems face challenges in suppressing resonance without deteriorating the double vibration proofing effect, as increasing damping in rubber portions can lead to increased vibration transmission in high frequency bands.
Innovation solutions
A vibration reduction device comprising a rod with an engine attachment portion and a vehicle body attachment portion, featuring an elastic component and an inertial mass supported by the elastic component, where the actuator generates a force proportional to the rod's axial direction velocity to control damping and resonance frequencies, thereby suppressing resonance without compromising the double vibration proofing effect.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If damping of the rubber portion is increased to suppress resonance, then resonance itself is suppressed, but transmission characteristic in high frequency band deteriorates
Why choose this principle:
The rubber portion is divided into two separate rubber portions (first and second rubber portions) with different damping characteristics. The first rubber portion has higher damping to suppress resonance, while the second rubber portion has lower damping to maintain high frequency transmission characteristics. This segmentation allows each portion to optimize for its specific frequency range without compromising the other.
Principle concept:
If damping of the rubber portion is increased to suppress resonance, then resonance itself is suppressed, but transmission characteristic in high frequency band deteriorates
Why choose this principle:
Different regions of the vibration reduction device are assigned different damping properties. The first rubber portion located at a specific position has higher damping coefficient for resonance suppression, while the second rubber portion at another position has lower damping coefficient for high frequency performance. This local differentiation of properties resolves the contradiction between resonance suppression and high frequency transmission.
Application Domain
Data Source
AI summary:
A vibration reduction device comprising a rod with an engine attachment portion and a vehicle body attachment portion, featuring an elastic component and an inertial mass supported by the elastic component, where the actuator generates a force proportional to the rod's axial direction velocity to control damping and resonance frequencies, thereby suppressing resonance without compromising the double vibration proofing effect.
Abstract
A vibration reduction device includes: a rod rigid body supported between an engine and a vehicle body via respective elastic bodies, a resonance frequency of which is set to be lower than an engine rigid body resonance frequency; an elastic component that is provided on the rod rigid body and caused to deform by a force acting in an axial direction of the rod rigid body; an inertial mass supported by the elastic component; and an actuator that causes the inertial mass to reciprocate in the axial direction of the rod rigid body by generating a force that is proportionate to an axial direction velocity of the rod rigid body. As a result, resonance itself can be suppressed without reducing a double vibration proofing effect.