| Summary: | 碩士 === 國立交通大學 === 土木工程系所 === 103 === Studies on the contact and mechanical behavior of granular particles during a debris flow have been limited.Most of the studies involved numerical simulations using discrete element method (DEM). Field measurements during a debris flow have been limited to those of pore pressure and flow velocity. Because of these limitations, we have not had a more complete understanding of the mechanical behavior of debris flow. This research is part of a project in the development of a “smart stone”. The main capability of the smart stone is to measure the contact and mechanical behavior among fast moving stones such as during a debris flow. The smart stone will be monitored with microelectromechanical system(MEMS) sensors, taking advantages their small size,low power consumption and low cost.The objective of this study is to develop the technique of measuring the distribution of normal forces on the surface of the smart stone. The author used fourteen piezoresistive tactile sensors to cover the surface of the smart stone and to measure the distribution of normal forces. The study could let the smart stone doing real-time data transfer in 5Hz. By integrating the hardware circuits that include Arduino micro-controller and Nordic nRF24L01 2.4GHz RF wireless communication module, readings collected by the tactile sensors can be transmitted as a maximum of 5 Hz frequency in real-time. The tactile sensor readings were reasonably repeatable and the system was energy efficient. Through these capabilities, the proposed smart stone should have the advantages of simplicity, efficiency and low power consumption.
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