Piezoelectric Accelerometer Preloading Without Base Plate
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Solution Overview
Problem
Existing acceleration measuring devices require additional components like base plates for mechanical preloading, increasing complexity and cost, while also limiting the mechanical preloading force.
Innovation Solution
The acceleration measuring device incorporates a piezoelectric system with two preloaded piezoelectric elements against two mass elements, eliminating the need for a base plate and enhancing mechanical preloading through a preloading assembly, allowing for electrical and mechanical testing before mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a base plate is used for mechanical preloading, then the preloading force is limited, but the device structure becomes simpler
Solution Approach 1:
The seismic mass is divided into two separate mass elements (first mass element and second mass element) positioned at opposite ends. This segmentation allows the piezoelectric system to be preloaded between these two mass elements without requiring a base plate, thereby increasing preloading force while maintaining structural simplicity.
Solution Approach 2:
Instead of using a base plate to apply preloading force from one side, the invention inverts the approach by using two mass elements to apply preloading forces from both sides of the piezoelectric system. This bidirectional preloading mechanism doubles the effective preloading force while eliminating the base plate component.
2Force
If additional components like base plate are used, then mechanical preloading is achieved, but manufacturing cost increases
Solution Approach 1:
The base plate component is extracted/removed from the device structure. The preloading function previously performed by the base plate is now achieved through the arrangement of two mass elements and the preloading assembly, eliminating the need for an additional base plate and reducing manufacturing cost.
Solution Approach 2:
The two mass elements serve multiple functions: they provide the preloading force on the piezoelectric system, act as seismic masses for acceleration detection, and eliminate the need for a separate base plate. This multi-functionality reduces the total component count and manufacturing complexity.
3Force
If two mass elements are used for preloading, then preloading force increases by 100-500%, but the quantity of components increases
Solution Approach 1:
The two mass elements are merged with the preloading assembly into an integrated structure. Rather than being separate additional components, the mass elements are positioned within the preloading assembly housing, forming a unified component package that provides both preloading and seismic mass functions.
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 reduces manufacturing costs and increases the mechanical preloading force by 100% to 500% compared to prior art, enabling more efficient and robust acceleration signal detection.
Implementation Method 1
the seismic mass exerts a force on the piezoelectric system that is proportional to its acceleration, wherein said force generates piezoelectric charges in the piezoelectric system
Data Source
AI summary
An acceleration measuring device includes a piezoelectric system, a seismic mass, and a base plate. During acceleration of the device, the seismic mass exerts onto the piezoelectric system a force that is proportional to the acceleration of the device. The force causes the piezoelectric system to generate piezoelectric charges that can be electrically processed as acceleration signals. The piezoelectric system includes two system elements, and the seismic mass correspondingly includes two mass elements. The device includes a preloading assembly that mechanically preloads the system elements against the mass elements.