Weighbridge vibration analysis using 3 accelerometer sensors and single excitation

Abstract

Weighbridge was a measuring instrument that was widely used by the Ministry of Transportation to scale the weight of loaded vehicles on the roadways. Due to being traversed by vehicles with various kind of weight and sizes, weighbridges often experience resonance due to the vibrations of vehicles above it. This will potentially cause damages to weighbridges. To anticipate it, researches regarding vibration analysis on weighbridge were needed to decrease resonance on weighbridges. The Vibration Analysis was done by Modal Analysis Method using three accelerometers and one shaker as the measurement sensor. In testing, weighbridge was modeled into a cylindrical beam shape with a length of 724 mm and a diameter of 16 mm. As the supports, Fix-fix Support was used at both ends of the beam. Next, Accelerometer measurement sensor mounted in three positions with a distance of 181 mm, 362 mm, 543 mm from beam supports. Then, Excitation force with four frequency variations (1 Hz, 3 Hz, 5 Hz, 10 Hz) was applied to the four measuring points located between the accelerometer sensor. The measurements result in the form of FRF graph can be obtained by QuickDAQ. From the FRF graph, the five lowest natural frequency of the weighbridge was obtained that equal to 89.9 Hz, 91 Hz, 69.9 Hz, 75 Hz, and 96.9 Hz.