Active Anti-vibration Device Using Acceleration Feedback Control
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Solution Overview
Problem
Conventional active anti-vibration devices face a trade-off where increasing the mass of the rod body to reduce resonance frequency and enhance anti-vibration performance deteriorates fuel efficiency, necessitating a method to achieve equivalent performance without actual mass increase.
Innovation Solution
An active anti-vibration device incorporating a pair of elastic connecting parts, a rod body, an inertial mass, and a drive part with a controller performing acceleration feedback control to generate a force proportional to the axial acceleration of the rod body, effectively increasing the virtual mass for improved anti-vibration performance without increasing the actual mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mass of the rod body is increased to reduce resonance frequency and enlarge the anti-vibration frequency region, then the anti-vibration performance is improved, but the fuel efficiency deteriorates due to the increased mass
Solution Approach 1:
The patent changes the control parameter from velocity feedback to acceleration feedback. By controlling the drive part to generate a force proportional to the axial acceleration of the rod body rather than velocity, the system achieves virtual mass increase through control strategy modification, thereby improving anti-vibration performance without actual mass increase
Solution Approach 2:
The patent replaces the mechanical approach of physically increasing rod body mass with a control-based approach. The controller generates control forces based on acceleration feedback that create the same dynamic effect as increased mass, substituting mechanical mass increase with intelligent control to achieve virtual mass effect
2Reliability
If velocity feedback control is used to control the drive part, then the control system is simpler, but the anti-vibration performance is insufficient compared to acceleration feedback control
Solution Approach 1:
The patent applies feedback control by having the controller receive detection results from the detection unit and control the drive part accordingly. Specifically, acceleration feedback is used where the control force is proportional to the measured acceleration, creating a closed-loop system that actively compensates for vibrations and improves anti-vibration performance
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
This approach allows for anti-vibration performance equivalent to increased mass without the mass increase, reducing resonance frequency and enhancing fuel efficiency by enlarging the anti-vibration frequency region without adding weight.
Implementation Method 1
a first force proportional to an axial acceleration of the rod body is generated
Implementation Method 2
a pair of elastic connecting parts, a rod body that connects the pair of elastic connecting parts
Data Source
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AI summary
An active anti-vibration device 10 includes a pair of elastic connecting parts 20 and 30, a rod body 40 that connects the pair of elastic connecting parts, an inertial mass 52 that is supported by the rod body, a drive part 58 that reciprocates the inertial mass in an axial direction of the rod body, and a controller 90 that is configured to be able to perform acceleration feedback control to control the drive part so that a first force proportional to an axial acceleration of the rod body is generated.