Vibration Reducing Device Resonance Suppression
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Solution Overview
Problem
Existing vibration reduction devices that achieve a double vibration proofing effect by increasing damping of the rubber portion in vibration reduction devices tend to deteriorate the transmission characteristic in high frequency bands, leading to a reduction in vibration suppression effectiveness.
Innovation Solution
A vibration reduction device comprising a rod with an engine attachment portion and a vehicle body attachment portion, an elastic component that deforms in the axial direction, an inertial mass supported by the elastic component, and an actuator that generates a force proportional to the axial direction velocity of the rod, which suppresses resonance without compromising the double vibration proofing effect by adjusting the resonance frequencies and using velocity feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If damping of the rubber portion is increased to suppress resonance, then resonance itself is suppressed, but transmission characteristic in high frequency band deteriorates
Solution Approach 1:
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.
Solution Approach 2:
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.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses resonance and maintains a double vibration proofing effect across a wide frequency range, reducing noise and vibration transmission to the vehicle body while avoiding the deterioration of transmission characteristics in high frequency bands.
Implementation Method 1
an elastic component that is provided on the rod and caused to deform by a force acting in an axial direction of the rod
Implementation Method 2
an actuator that causes the inertial mass to reciprocate in the axial direction of the rod by generating a force that is proportionate to an axial direction velocity of the rod
Implementation Method 3
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
Implementation Method 4
a resonance frequency of a rod rigid body is lower than a bending and/or twisting resonance frequency of an engine
Data Source
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AI summary
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.