Electroactive Polymer Mass Damper for Multi-Frequency Vibration Control
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Solution Overview
Problem
Conventional mass dampers are limited in effectively damping multiple vibration frequencies in vibrating systems, requiring multiple dampers that can interfere with each other and increase installation effort, especially in preventing resonance catastrophes in systems with multiple critical frequencies.
Innovation Solution
A mass damper utilizing an electroactive polymer whose stiffness can be varied with electric voltage, allowing a single damper to adjust its resonant frequency and damp multiple frequencies, reducing the need for multiple dampers and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple conventional mass dampers are used to damp multiple vibration frequencies, then the damping coverage is improved, but the device complexity and installation effort increase
Solution Approach 1:
The patent applies universality by designing a single mass damper that can damp multiple vibration frequencies through the use of electroactive polymers. The electroactive polymer material allows the damper to adapt its resonant frequency dynamically, enabling one device to perform the function of multiple conventional dampers with different fixed resonant frequencies.
Solution Approach 2:
The patent applies dynamics by using electroactive polymers that can change their mechanical properties (stiffness, resonant frequency) in response to electrical signals. This dynamic adaptability allows the single damper to tune its resonant frequency to match different vibration frequencies of the exhaust system, thereby damping multiple frequencies over time or simultaneously.
2Reliability
If multiple conventional mass dampers are installed to cover multiple critical frequencies, then the damping effectiveness is improved, but the installation effort and space requirements increase
Solution Approach 1:
The universal mass damper with electroactive polymer replaces multiple specialized dampers, reducing installation complexity. Instead of installing several dampers at different locations with different resonant frequencies, a single adaptive damper is installed and controlled to provide the same or better protection against resonance catastrophes across multiple frequencies.
3Adaptability or versatility
If multiple conventional mass dampers are used to damp multiple frequencies, then the frequency coverage is improved, but the dampers may mutually hinder each other's function
Solution Approach 1:
The patent extracts the frequency-selective function from the physical structure of multiple dampers and transfers it to a controllable material property (electroactive polymer). Instead of having multiple physical dampers that can interfere with each other's vibrations, the solution uses a single damper whose resonant frequency is extracted and adjusted through electrical control of the electroactive polymer, eliminating mechanical interference between 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 electroactive polymer-based mass damper efficiently damps various vibration frequencies with a single coupling point, reducing vibration amplitudes and preventing resonance catastrophes without the need for multiple dampers, thereby enhancing system stability and simplifying installation.
Implementation Method 1
Electroactive polymers are polymers which change their shape due to the application of an electric voltage
Implementation Method 2
The damper can perform great deflections at this resonant frequency and extract vibration energy from the vibrating structure to be damped for its own vibration motions
Data Source
AI summary
A mass damper method includes providing an electroactive polymer (7) and using the electroactive polymer (7) to manufacture a mass damper (6). The mass damper (6) for damping a vibrating system of a motor vehicle includes at least one of a damping body (10) forming a countervibrating mass with a damping spring (11) and a springy damping body (10) forming the countervibrating mass. The damping body (10) is indirectly or directly coupled with the vibrating system. The springy damping body (10) or the damping spring (11) includes an electroactive polymer (7). A motor vehicle exhaust system of an internal combustion engine is provided including an exhaust gas line (3) with an exhaust pipe (4), an exhaust gas-treating device (5) integrated in the exhaust pipe and the mass damper (6) coupled with the exhaust gas line.