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Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
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Sensors and Materials,
Volume 30, Number 8(1) (2018)

Copyright(C) MYU K.K. All Rights Reserved.
pp. 1743-1752
S&M1631
https://doi.org/10.18494/SAM.2018.1876
Published: August 15, 2018

Optimization of a Pre-impact Fall Detection Algorithm and Development of Hip Protection Airbag System [PDF]

Soonjae Ahn, Dagyeong Choi, Jongman Kim, Seongjung Kim, Youngjae Jeong, Min Jo, and Youngho Kim

(Received March 31, 2017; Accepted February 16, 2018)

Keywords: pre-impact fall detection, airbag, inertial sensor unit, optimization

In this study, a pre-impact fall detection algorithm using a custom-made inertial sensor was optimized, and a spring-trigger airbag system was developed for preventing injuries from falls. Four different types of simulated falls were performed by 20 healthy volunteers (age 23.4 ± 4.4 years), and six different daily activities were tested in 14 elderly subjects (age 71.8 ± 4.0 years). An inertial sensor unit was used to measure acceleration, angular velocity, and vertical angle during all activities. Thresholds of 0.9 g acceleration, 47.3°/s angular velocity, and 24.7° vertical angle were determined on the basis of optimizing lead time and accuracy in pre-impact fall detection. A belt-type airbag system consisted of a polyurethane inner skin, an artificial leather outer shell, and a spring-trigger inflator. To evaluate the accuracy of the airbag system, 10 healthy adult males (age 28.5 ± 2.7 years) wore the system and performed three sets of simulated falls. Fall detection was achieved 401.9 ± 46.9 ms before impact on average, and the airbag inflated without fail during the falls (100% sensitivity). In all daily activities, no airbag inflation occurred (100% specificity).

Corresponding author: Youngho Kim


Cite this article
Soonjae Ahn, Dagyeong Choi, Jongman Kim, Seongjung Kim, Youngjae Jeong, Min Jo, and Youngho Kim, Optimization of a Pre-impact Fall Detection Algorithm and Development of Hip Protection Airbag System, Sens. Mater., Vol. 30, No. 8, 2018, p. 1743-1752.


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