Abstract:
Speed control system and an Arduino based accelerometer real-time data acquisition system has been developed and applied to a surface vibrating table unit for laboratory applications. The speed control unit employs the use of an auto transformer and multi-tap variable resistor to regulate the speed a single-phase capacitor start induction motor based on 3 level of control input. In order to obtain varying speed levels, three different eccentric mass combinations (EMCs) were employed. Eccentric mass disc loaded with three 10 g mass, six 10 g mass and nine 10 g mass. Three speed levels were obtained for each EMC; (1424, 1459, 1481) rpm for EMC1, (1496, 1508, 1541) rpm for EMC2, (1493, 1506, 1523) rpm for EMC3. The Arduino based data acquisition unit employs the use of piezo-electric material-based acceleration sensor to measure and acquire the vibration in the surface vibrating table in 3-dimension. Random vibration date in the X, Y, and Z axes directions were collected for three relatively regulated speeds over a period of five minutes for the different EMCs. The maximum vibration acceleration measured ranges from 1.02 g to 1.35 g on the X-axis,1.07 g to 1.30 g on the Y-axis and 0.55 g to 0.80 g on the Z-axis for EMC1. For EMC2, it ranges from 1.13 g to 1.18 g on the X-axis,1.76 g to 2.09 g on the Y-axis and 0.91 g to 1.04 g on the Z-axis. For EMC3, -0.87 g to 0.92 g on the X-axis, -1.23 g to 0.90 g on the Y-axis and -1.40 g to 0.45 g on the Z-axis.
(g = 9.81 m/s2)
