Rotating Body Vibration Damping with Balancer and Liquid Damper
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Solution Overview
Problem
Existing vibration damping devices, such as automatic balancers, are ineffective in low-speed ranges and can amplify vibrations, preventing the acceleration of rotating bodies beyond the resonance range.
Innovation Solution
A vibration damping device combining an automatic balancer with a liquid damper that includes a collision member and a relative rotation unit, such as air resistance imparting members or a brake mechanism, to ensure effective vibration damping across high-speed and resonance ranges by converting kinetic energy to heat and maintaining relative rotation with the rotating body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an automatic balancer is used to damp vibration in the high-speed range, then vibration damping effect is improved, but vibration is amplified in the low-speed range
Solution Approach 1:
The vibration damping device is divided into two distinct functional components: an automatic balancer for high-speed range vibration damping and a liquid damper for low-speed range vibration damping. This segmentation allows each component to specialize in a specific speed range, preventing the automatic balancer from amplifying low-speed vibrations while maintaining its high-speed effectiveness.
Solution Approach 2:
The liquid damper acts as an intermediary component that handles the low-speed vibration damping function which the automatic balancer cannot perform effectively. The liquid damper mediates the vibration control in the low-speed range, allowing the automatic balancer to operate in its optimal high-speed range without causing harmful amplification effects.
2Speed
If the rotating body is accelerated through the resonance range, then high-speed operation is achieved, but vibration may be amplified and diverge
Solution Approach 1:
The liquid damper is positioned to provide preliminary vibration damping action during the acceleration through the resonance range. By actively damping vibrations in the low-speed and resonance ranges before the rotating body reaches high-speed operation, the system prevents vibration amplification and divergence, ensuring stable acceleration through the critical resonance zone.
3Reliability
If a liquid damper is added to damp vibration in the resonance range, then vibration damping is improved, but device complexity increases
Solution Approach 1:
The liquid damper utilizes hydraulic principles by sealing liquid within a casing and employing a collision member to convert kinetic energy to heat energy through liquid collision. This hydraulic approach provides effective vibration damping in the resonance range with a relatively simple structure, avoiding the need for complex mechanical systems while achieving the desired damping effect.
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 device effectively dampens vibrations in both high-speed and low-speed ranges, allowing for the acceleration of rotating bodies beyond the resonance range, with enhanced damping effects in the resonance range due to the liquid damper's collision mechanism and relative rotation.
Implementation Method 1
as the liquid collides with the collision member, part of kinetic energy is converted to heat energy, with the result that the vibration of the rotating body is suppressed
Implementation Method 2
as the mass body such as the balls moves radially outward on account of the centrifugal force, the center of gravity at a radially outer part is moved toward the center of the rotating body
Implementation Method 3
the orbital revolution of the rotating body due to whirling of the rotating body does not coincide with the axial rotation of the liquid damper. It is therefore possible to prevent the liquid from immovably adhering to the inner wall surface of the liquid damper due to the centrifugal force
Data Source
AI summary
A vibration damping device which is able to damp vibration of a rotating body in a high-speed range and to certainly accelerate the rotating body to the high-speed range is provided.A vibration damping device 1 damping vibration of a rotating body 100 includes an automatic balancer 2 which is configured to cancel out imbalance of the rotating body 100 when the rotating body rotates 100; a liquid damper 4 which is coaxially rotatable with the rotating body 100 and includes a collision member 23 provided in a casing 20 in which liquid 22 is sealed, the liquid colliding with the collision member 23 when the liquid 22 moves in a circumferential direction; and a relative rotation unit 5 which is configured to cause the liquid damper 4 to rotate relative to the rotating body 100.