Seat Sensor Mount With Vibration Isolation for Heart Rate Sensing
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Solution Overview
Problem
Conventional seat designs with piezoelectric sensors in moving bodies, such as vehicles, experience decreased accuracy in heart rate measurements due to vibrations caused by the movement of the body.
Innovation Solution
A seat with a piezoelectric sensor and a supporting member inside a recess, where a gap is provided between the supporting member and the recess's inner wall, and a vibration-proofing material is used to reduce vibration transmission, ensuring the sensor accurately measures heartbeat-induced vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a piezoelectric sensor is provided in a seat of a moving body to sense heartbeat-induced body vibrations, then heart rate measurement is enabled, but the accuracy of the measurement is decreased by vibration occurring in the moving body
Solution Approach 1:
A vibration-proofing material is introduced as an intermediary substance between the supporting member and the inner wall of the recess. This material absorbs and attenuates vibration noise from the moving body, preventing it from reaching the piezoelectric sensor. The vibration-proofing material acts as a mediator that blocks the transmission path of harmful vibrations while allowing the sensor to detect heartbeat-induced vibrations accurately.
Solution Approach 2:
A gap is provided between the supporting member and the inner wall of the recess, effectively separating and isolating the piezoelectric sensor from the vibration source. This spatial extraction creates a vibration-free zone around the sensor, removing the harmful vibration noise from the sensor's immediate environment and improving measurement accuracy.
2Stability of the object's composition
If a supporting member is disposed inside a recess to support the piezoelectric sensor, then the sensor is stabilized, but vibration transmission from the seat structure to the sensor occurs
Solution Approach 1:
The vibration-proofing material serves as an intermediary layer between the supporting member and the recess wall. It maintains the stabilizing support structure while simultaneously blocking vibration transmission paths. The material allows the sensor to remain stable and supported while preventing vibration energy from the seat structure from reaching the sensor.
Solution Approach 2:
The supporting member structure, which initially transmits vibrations, is converted into a beneficial element by introducing the vibration-proofing material. The same structural support that provides stability is now combined with vibration isolation, transforming the potentially harmful vibration transmission into a beneficial stable platform for accurate sensing.
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 effectively reduces vibration noise, enhancing the accuracy of heart rate measurements by attenuating vibrations, particularly at specific frequency bands, and improving the reliability of R-R interval calculations.
Implementation Method 1
at least one piezoelectric sensor including a first surface located on a side of a body of a sitter and a second surface located opposite the first surface, the piezoelectric sensor configured to sense heartbeat-induced body vibrations of the sitter through the first surface
Implementation Method 2
a gap is provided in at least part of an area between a surface of the supporting member and an inner wall of the recess so that the surface of the supporting member and the inner wall of the recess do not come into contact with each other
Data Source
AI summary
A seat provided in a moving body includes: at least one piezoelectric sensor including a first surface located on a side of a body of a sitter and a second surface located opposite the first surface, the piezoelectric sensor configured to sense heartbeat-induced body vibrations of the sitter through the first surface; and at least one supporting member disposed inside a recess which is formed in at least one of a seating surface of the seat and a back surface of the seat, the supporting member supporting the piezoelectric sensor under the second surface of the piezoelectric sensor. A gap is provided in at least part of an area between a surface of the supporting member and an inner wall of the recess so that the surface of the supporting member and the inner wall of the recess do not come into contact with each other.