Piezoelectric Power Generation Apparatus Sub Vibration Suppression
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Solution Overview
Problem
Existing piezoelectric power generation apparatuses experience reduced power generation efficiency due to the generation of sub vibrations, which interfere with main vibrations and reduce the effectiveness of energy conversion.
Innovation Solution
The apparatus is designed with a configuration that includes a first vibrating portion, a first weight portion, and a second vibrating portion, where the positions of the fixed and free ends are optimized to minimize sub vibrations, allowing for enhanced power generation efficiency by adjusting the magnitudes of main and sub vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a piezoelectric power generation apparatus is designed to convert vibration energy into electric energy, then electric power generation is achieved, but sub vibrations are generated that reduce power generation efficiency
Solution Approach 1:
The patent applies the counterweight principle by introducing a second weight portion that generates sub vibrations opposite in phase to those generated by the first weight portion. The piezoelectric element is positioned between these two weight portions, allowing it to detect and convert the differential sub vibrations into electrical energy while the main vibrations remain constructive for power generation
Solution Approach 2:
The patent converts the harmful sub vibrations into beneficial electrical energy by positioning the piezoelectric element to detect sub vibrations from both weight portions and generate electricity from their differential motion. This transforms what was previously a efficiency-reducing factor into a useful energy source
2Power
If the positions of vibrating portions and weight portions are adjusted to suppress sub vibrations, then power generation efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the piezoelectric element: it serves as both the power generation element that converts main vibrations to electricity and the detection element that senses sub vibrations from the counterweight system. This integration reduces the need for separate components and simplifies the overall device structure
Solution Approach 2:
The piezoelectric element performs multiple functions simultaneously: generating power from main vibrations, detecting sub vibrations from both weight portions, and enabling the counterbalance mechanism. This multi-functionality reduces component count and device complexity while maintaining high power generation efficiency
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 configuration effectively suppresses sub vibrations, thereby improving the power generation efficiency by ensuring that the energy is primarily converted into main vibrations, leading to higher electric power output.
Implementation Method 1
a piezoelectric element 121... compression stress and tensile stress repeatedly act on the piezoelectric element 121 from the first weight 114 and the second weight 122, and electric charges are generated on the piezoelectric element 121 with a piezoelectric effect
Data Source
AI summary
A piezoelectric power generation apparatus that includes a first vibrating portion having a fixed end and a free end, a first weight portion bonded to the free end of the first vibrating portion, a second vibrating portion having a fixed end bonded to the first weight portion and a free end, and including a vibrating plate and a piezoelectric element provided on the vibrating plate. A second weight portion is bonded to the free end of the second weight portion. In a state where the piezoelectric power generation apparatus is arranged on a vibration surface and is still, a position of the free end of the first vibrating portion and a position of the fixed end of the second vibrating portion in an axial direction perpendicular to the vibration surface are different from each other.