Perpustakaan Digital ITB

Vibration monitoring is crucial for maintaining the reliability of industrial machinery. However, the cost of triaxial vibration sensors is still very expensive. While some low-cost piezoelectric accelerometers are available, they often lack protective housing, electrical connectors, and mounting mechanisms. This study aims to develop a low-cost triaxial vibration sensor for vibration monitoring of industrial machinery. The design requirements and objectives were established through literature review to guide the development process which included an iterative design of housing, material selection, sensing element selection, and finite element modal analysis. These steps produced a design for a triaxial vibration sensor with an Aluminium 6061 housing and the Senther 590C accelerometer was chosen as the sensing element for this vibration sensor. Trial and error to reduce voids was done for the resin casting process used to fill the cavity of the sensor. A custom power supply and signal conditioning module was also developed, incorporating AC coupling functionality for compatibility with standard data acquisition systems. The vibration sensor along with the power supply and signal conditioning system was built and then tested for its linearity, frequency response, and cross sensitivity. The results confirmed that the developed sensor met the target specification achieving sensitivity at over 43 mV/g, a nonlinearity less than 0.5%, and frequency response of under ±10% error for 10 to over 3.2 kHz. However, the cross sensitivity reached 14% which exceeded the limit of 10%. The developed sensor cost approximately USD 225, relatively cheaper than a commercial unit at USD 1,300. This shows that a low-cost triaxial sensor was successfully developed, but still need improvements of cross sensitivity for future commercialisation.