DESIGN OF A WIRELESS SENSOR NETWORK DEVICE BASED ON SAMR21 MICROCONTROLLER FOR BRIDGE STRUCTURE HEALTH MONITORING SYSTEMS

• Main Author: Dwi Purnomo, Rizki
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/80134
• Institution: Institut Teknologi Bandung

Structural health monitoring of civil structures is an important research area used for continuous health monitoring and damage prediction. To estimate the damage to va- rious civil structures, continuous monitoring of capital parameters is required. This comes from the natural frequencies of the building and is measured mostly using acce- lerometer sensors. Monitoring is carried out only within a certain period of time, some of which is for a short period of time, so that historical data is not collected properly. Apart from that, there is no early warning system to provide information about damage indications. So in this research a WSN device for SHMS was developed. The results of the design, implementation, and testing demonstrated a series of findings that are important for understanding the feasibility and performance of this system. Testing of data processing functions on sensor nodes, including Filter, Welch, and PeakPicking, has been successfully carried out. The sensor node calibration process produces an FFT calculation percentage error of 0.00585 % and an amplitude error of 0.495 % at a frequency of 15.92 Hz with an amplitude of 2 m/s2. Meanwhile, at a frequency of 40 Hz at an amplitude of 2 m/s2, the frequency error is 0.05079% and the amplitude er- ror is 0.865 %. The verification stage on the test bridge showed varying measurement percentage errors, namely 0.09785 %, 0.09785 %, and 0.008896 % from three tests. Meanwhile, the error amplitude was 1.822 %, 1.62 % and 0.19 % from three tests. Ho- wever, these results have fit the specified specifications with an error percentage below 12%. Transceiver performance shows that the minimum distance specification of 15 m for successful communication is fit, because the device can still communicate well up to a distance of 30 m. Synchronization testing produces an average accuracy of 12.1 ms, although it has not reached the expected specifications (10 ms), this test provides an understanding of the limitations in synchronization that need to be corrected. A series of integration tests for WSN devices with the SHMS system shows that all functions of the WSN devices can be integrated. The test results show a number of successes in the function and performance of the WSN system in the SHMS application. Although there iii are several areas that still need improvement to achieve the desired specifications, the overall system performance shows good potential for further development in SHMS.