Design of Free Vibration Single Degree of Freedom Horizontal Bending Bar Testing Equipment

Vibration is a subdiscipline of dynamics, which is the study of the repetitive motion of objects relative to stationary frames of reference. The process of learning vibration science in universities can take place through practicum activities. According to the learning experience, the single degree of freedom horizontal bending bar is constructed. The equipment can conduct free vibration in several variations to give students different approaches. The objective of the practicum is to find the value of natural frequency. This paper uses three methods to obtain the natural frequency: Rayleigh method, software, and experiments. The other variables that influence the natural frequency are the length of the bar and its material. By comparing the Rayleigh method with software, the natural frequency value with Copper, Brass, and Stainless-Steel material bars decreased by 3.379 percent, 8.735 percent, and 1.765 percent respectively. Comparing Rayleigh method with experiments has varied results for different lengths and materials. The highest difference is 16.834 percent in 100 cm length copper.