Piezo-Actuated Bead Damping for Sheet Metal Vibration Control
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Solution Overview
Problem
Existing systems using piezoelectric actuators for vibration damping in mechanical structures do not optimize the coupling of structure-borne sound to maximize damping of various oscillation modes, leading to suboptimal vibration minimization.
Innovation Solution
Applying piezoelectric actuators to the inside or outside of beads in the component, particularly at places of high curvature, to achieve maximum rigidity and decoupling of excitation points, allowing for precise control and effective propagation of elimination signals, thereby enhancing structure-borne sound energy damping without compromising mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If piezoelectric actuators are applied to flat surfaces of the component, then the coupling of structure-borne sound is simpler, but the damping efficiency of various oscillation modes is suboptimal
Solution Approach 1:
The patent applies piezoelectric actuators specifically to bead regions rather than flat surfaces. The beads create localized areas of high curvature and inherent rigidity, concentrating the acoustic energy input where it most effectively couples with multiple oscillation modes. This local placement strategy optimizes damping effectiveness without requiring complex manufacturing procedures.
2Ease of manufacture
If piezoelectric actuators are placed at locations with low inherent rigidity, then the coupling is easier, but the propagation and effect of elimination signals are suboptimal
Solution Approach 1:
The patent utilizes the curved surface of beads as the mounting location for piezoelectric actuators. The spherical/curved geometry of the beads provides inherent rigidity and creates favorable conditions for sound wave propagation. The curvature helps concentrate and direct the elimination signals effectively across the component surface, improving precision without complicating the placement process.
3Reliability
If more piezoelectric actuators are used to dampen multiple oscillation modes, then the vibration damping coverage is improved, but the device complexity and cost increase
Solution Approach 1:
The patent makes the bead structures serve dual functions: (1) providing mechanical stiffening to the component, and (2) serving as optimal mounting locations for piezoelectric actuators to dampen oscillation modes. This multi-functionality means that the same structural features that strengthen the component also optimize the vibration damping system, eliminating the need for additional dedicated damping components.
Solution Approach 2:
The beads act as intermediary structures that mediate between the piezoelectric actuators and the component body. They provide a rigid coupling interface that efficiently transfers the acoustic energy from the actuators into the component, enhancing the effectiveness of each actuator and reducing the total number needed to achieve comprehensive damping coverage.
4Strength
If deeper beads are formed in the component, then the mechanical strength and rigidity are improved, but the starting material and work steps increase
Solution Approach 1:
The patent employs active vibration damping technology to compensate for potentially reduced mechanical strength from shallower beads. By using piezoelectric actuators mounted on the bead surfaces to actively counteract vibrations, the system achieves the necessary structural performance without requiring excessively deep or complex bead formations, thus reducing manufacturing complexity and material usage.
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 enables significant improvement in structure-borne sound energy damping at the same electrical energy level, reducing the need for material and manufacturing steps, and allows for efficient damping of multiple oscillation modes with fewer actuators.
Implementation Method 1
the piezoelectric actuator is operated in a feedback control circuit... in order to provide an actual value for the feedback control target of vibration minimization
Implementation Method 2
the piezoelectric actuator is applied to the inside or the outside of a bead formed in the component... maximum inherent rigidity can be achieved for the place where sound is fed in
Data Source
AI summary
A planar component (1), in particular a sheet metal element, which is provided with at least one piezoelectric actuator (7-9) for its active vibration damping, wherein the piezoelectric actuator (7-9) is applied to the inside or the outside (15) of a bead (3-5) formed in the component.