A human airbag system based on MEMS motion sensing technology.

• Other Authors: Shi, Guangyi.
• Format: Others
• Language: English; Chinese
• Published: 2008
• Subjects: Detectors; Falls (Accidents) > Prevention; Hip joint > Fractures > Prevention; Microelectromechanical systems; Support vector machines
• Online Access: http://library.cuhk.edu.hk/record=b6074546; http://repository.lib.cuhk.edu.hk/en/item/cuhk-344179

Falls and fall-induced fractures are very common among the elderly. Hip fractures account for most of the deaths and costs of all the fall-induced fractures. This dissertation presents a novel MEMS based human airbag system used as a hip protector. A Micro Inertial Measurement Unit (muIMU) which is based on MEMS accelerometers and gyro sensors is developed as the motion sensing part of the system. The result using this muIMU based on Support Vector Machine (SVM) training to recognize falling-motions are presented, where we showed that selected eigenvector sets generated from 200 experimental data can be separated into falling and other motions completely. For real-time recognition, the SVM filter should be embedded to a high speed DSP system for fast computation and complex filter analyses. After the simulations for SVM filter and FFT were performed on a computer simulator (TI DSP320 C6713), we used DSK6713 (DSP Starter Kit) as our target board and integrated FFT and SVM filter on the chip. The whole algorithm works well with exist sensor data. Demo shows that our DSP system can successfully classify fall and non-fall states. At the same time, the system can trigger our airbag inflation mechanism when a fall occurs. The system was shown to open the airbag in real-time and protected the experimenter's hip area. === by Shi, Guangyi. === "March 2008." === Adviser: Wen Jung Li. === Source: Dissertation Abstracts International, Volume: 70-03, Section: B, page: 1855. === Thesis (Ph.D.)--Chinese University of Hong Kong, 2008. === Includes bibliographical references (p. 108-111). === Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. === Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. === Abstracts in English and Chinese. === School code: 1307.