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This paper aims to investigate and to describe the possibility of using the smartphones in the rotors balancing. It shows in the beginning a method to extract the necessary parameters for implementing the field balancing operation. An Android app was developed in order to record the smartphone sensors data of unbalanced rotors. The recorded data is then processed and used to identify the quantity of mass necessary and its position via a Matlab app. At the end, the smartphone results were compared by the exact results.

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Studying the dynamics of beams is considered an indispensable field for mechanical and civil engineering students. This paper describes, in detail, the use of smartphones in educational practical works to determine and examine the dynamic characteristics of beams subjected to free vibration. Where the smartphone is equipped with a mobile application to acquire the vibration data of the given beams and store it for processing. Three cases have been discussed, in which three types of boundary conditions have been presented. Also, a discussion was presented to show the influence of boundary conditions and material/geometrical properties of beams on the vibration damping of the system. In addition, some recommendations have been stated regarding the data collection and the processing step to mitigate the measurement errors. Experimental results show an agreement with theoretical results regarding the natural frequency and equivalent mass of the beam system which make the smartphone an alternative instrument to teach dynamic vibration of beams in case of the non-availability of professional equipment.