Vibration reducing device and vibration reducing method
First Claim
1. A vibration reducing device for reducing vibration of a vibration damping object, comprising:
- an inertial mass actuator adapted to be mounted at a fixed location on the vibration damping object, the inertial mass actuator including a solid inertial mass having a fixed size and shape and a force generating element that causes the inertial mass to be displaced with respect to the vibration damping object by applying a vibration damping force on the vibration damping object, the vibration damping force being a reactive force generated due to displacement of the inertial mass;
a vibration state detector contacting the inertial mass and configured to detect the vibration state of the inertial mass; and
a controller connected to the inertial mass actuator and vibration state detector;
wherein the controller is configured to determine the displacement and velocity of the vibration damping object at a part where the inertial mass actuator is mounted, and the displacement and velocity of the inertial mass, based on the vibration state of the inertial mass; and
wherein the controller is configured to control the vibration damping force based on the determined displacement and velocity of the vibration damping object at the part where the inertial mass actuator is mounted, and the displacement and velocity of the inertial mass, by changing a length of the force generating element according to a driving signal; and
wherein the controller is configured to compensate for temperature-driven changes in the relationship correlating the driving signal and an elongation force of the force generating element without using a temperature sensor, wherein the compensating comprises;
applying a predetermined force to the force generating element to generate a voltage;
determining a natural vibration frequency fΔ
N from the voltage;
comparing the natural vibration frequency fΔ
N to a predetermined reference fN to determine a force conversion coefficient Δ
; and
modifying the relationship correlating the driving signal and the elongation force of the force generating element based on the force conversion coefficient Δ
by multiplying the force conversion coefficient Δ
by a piezoelectric constant A to obtain a modified piezoelectric constant Δ
A.
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Accused Products
Abstract
A vibration reducing device, including an inertial mass actuator adapted to be mounted on a vibration damping object, that applies a vibration damping force on the vibration damping object, the vibration damping force being a reactive force generated due to displacement of an inertial mass. A vibration state detector detects the vibration state of the inertial mass. A controller is connected to the inertial mass actuator and vibration state detector. The controller determines the displacement and velocity of the vibration damping object at a part where the inertial mass actuator is mounted, and the displacement and velocity of the inertial mass, based on the vibration state of the inertial mass. The vibration damping force is controlled based on the determined displacement and velocity of the vibration damping object at the part where the inertial mass actuator is mounted, and the displacement and velocity of the inertial mass.
7 Citations
13 Claims
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1. A vibration reducing device for reducing vibration of a vibration damping object, comprising:
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an inertial mass actuator adapted to be mounted at a fixed location on the vibration damping object, the inertial mass actuator including a solid inertial mass having a fixed size and shape and a force generating element that causes the inertial mass to be displaced with respect to the vibration damping object by applying a vibration damping force on the vibration damping object, the vibration damping force being a reactive force generated due to displacement of the inertial mass; a vibration state detector contacting the inertial mass and configured to detect the vibration state of the inertial mass; and a controller connected to the inertial mass actuator and vibration state detector; wherein the controller is configured to determine the displacement and velocity of the vibration damping object at a part where the inertial mass actuator is mounted, and the displacement and velocity of the inertial mass, based on the vibration state of the inertial mass; and wherein the controller is configured to control the vibration damping force based on the determined displacement and velocity of the vibration damping object at the part where the inertial mass actuator is mounted, and the displacement and velocity of the inertial mass, by changing a length of the force generating element according to a driving signal; and wherein the controller is configured to compensate for temperature-driven changes in the relationship correlating the driving signal and an elongation force of the force generating element without using a temperature sensor, wherein the compensating comprises; applying a predetermined force to the force generating element to generate a voltage; determining a natural vibration frequency fΔ
N from the voltage;comparing the natural vibration frequency fΔ
N to a predetermined reference fN to determine a force conversion coefficient Δ
; andmodifying the relationship correlating the driving signal and the elongation force of the force generating element based on the force conversion coefficient Δ
by multiplying the force conversion coefficient Δ
by a piezoelectric constant A to obtain a modified piezoelectric constant Δ
A. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A vibration reducing device for reducing vibration of a vibration damping object, comprising:
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means for applying a vibration damping force at a fixed location on a vibration damping object, the vibration damping force being a reactive force generated due to displacement of a solid inertial mass having a fixed size and shape, the means for applying a vibration damping force including a force generating means; means contacting the inertial mass for detecting a vibration state of the inertial mass; and a controller for controlling the vibration reducing device, that determines the displacement and velocity of the vibration damping object at a part where the means for applying a vibration damping force is mounted to the vibration damping object, and that determines the displacement and velocity of the inertial mass, based on the vibration state of the inertial mass, wherein the vibration damping force is controlled based on the determined displacement and velocity of the vibration damping object at the part where the means for applying a vibration damping force is mounted, and the displacement and velocity of the inertial mass, by changing a length of the force generating means according to a driving signal; and wherein the driving signal compensates for temperature-driven changes in the relationship correlating the driving signal and an elongation force of the force generating means without using a temperature sensor, wherein the compensating comprises; applying a predetermined force to the force generating element to generate a voltage; determining a natural vibration frequency fΔ
N from the voltage;
comparing the natural vibration frequency fΔ
N to a predetermined reference fN to determine a force conversion coefficient Δ
; andmodifying the relationship correlating the driving signal and the elongation force of the force generating element based on the force conversion coefficient Δ
by multiplying the force conversion coefficient Δ
by a piezoelectric constant A to obtain a modified piezoelectric constant Δ
A.
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Specification