Dynamic Damper Control Using Fixed-Point Arithmetic
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Solution Overview
Problem
Conventional dynamic dampers using magnetorheological elastomers (MREs) face challenges in stabilizing control over variable natural frequencies due to temperature changes and production variations, making it difficult to effectively reduce vibrations with low-cost microcomputers, especially when multiple dampers interfere and amplify vibrations.
Innovation Solution
A dynamic damper control device employing a low-cost processor with a fixed-point arithmetic unit, including an electromagnet, magnetorheological elastomers, and an elastic characteristics control unit that adjusts magnetic force based on calculated target and reference amplitude amplification ratios to quickly follow target frequencies, thereby stabilizing vibration reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a dynamic damper uses magnetorheological elastomers (MRE) with variable natural frequency to reduce vibrations, then the vibration reduction effectiveness is improved, but the control stability deteriorates due to temperature changes and production variations
Solution Approach 1:
The patent implements a feedback control system where the controller continuously monitors the actual natural frequency of the MRE and compares it with the target natural frequency. Based on this comparison, the controller adjusts the magnetic field strength to correct frequency deviations caused by temperature changes and production variations, thereby maintaining control stability while preserving vibration reduction effectiveness.
Solution Approach 2:
The patent dynamically changes the magnetic field strength parameter applied to the MRE to adjust its natural frequency. By varying this physical parameter in real-time based on feedback, the system compensates for environmental and manufacturing variations, maintaining both vibration reduction effectiveness and control stability.
2Productivity
If a dynamic damper is adjusted to high frequency (e.g., 200 Hz) for effective vibration reduction, then the vibration reduction effectiveness is improved, but the calculation complexity increases making it difficult to implement with low-cost microcomputers
Solution Approach 1:
The patent replaces complex floating-point arithmetic calculations with simplified fixed-point arithmetic operations that can be executed by low-cost microcomputers. This substitution maintains the essential functionality of frequency adjustment while reducing computational complexity, enabling high-frequency vibration reduction (e.g., 200 Hz) to be achieved with affordable hardware.
Solution Approach 2:
The patent transforms the mathematical computation from floating-point to fixed-point arithmetic, changing the numerical representation parameter. This allows the system to perform necessary calculations for high-frequency control using simpler, less resource-intensive operations suitable for low-cost microcomputers.
3Adaptability or versatility
If multiple dynamic dampers are applied to reduce different vibration frequencies, then the coverage of vibration reduction is improved, but the natural frequencies interfere with each other and amplify vibrations
Solution Approach 1:
The patent makes a single dynamic damper universal by enabling it to adapt to multiple target frequencies through variable stiffness control of the MRE. Instead of requiring multiple fixed-frequency dampers, one adjustable damper can effectively address multiple vibration frequencies, eliminating interference while maintaining broad frequency coverage.
Solution Approach 2:
The patent introduces dynamic adjustability to the damper's natural frequency through real-time control of the MRE's magnetic field. This allows the damper to dynamically change its characteristics to match different target frequencies, preventing the fixed-frequency interference problem that occurs with multiple static dampers.
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 enables the dynamic damper to efficiently and stably adjust its frequency to match target vibrations, reducing vibrations effectively and simplifying signal processing, even with low-cost processors, by using a controller that calculates and adjusts magnetic force to match target frequencies.
Implementation Method 1
Rigidity of rubber into which magnetic powders have been mixed becomes variable by controlling a magnitude of a magnetic field that is produced in the rubber by an electric current running through a coil
Implementation Method 2
an electromagnet configured to produce a magnetic force applied to the magnetorheological elastomer
Data Source
AI summary
The present invention relates to a dynamic damper control device. A control unit includes a first acceleration sensor configured to obtain a first acceleration of a mass member, a second acceleration sensor configured to obtain a second acceleration of a vibration control target member, and a target amplitude amplification ratio calculating unit configured to calculate a target amplitude amplification ratio of the mass member and the vibration control target member based on the first acceleration and the second acceleration, and is configured to change a magnetic force produced from an electromagnet based on the target amplitude amplification ratio.