Vibration Analysis

Bachelor in Mechanical Engineering or in related areas.

In theoretical lessons the content is presented through the use of both the board and PowerPoint slides. In theoretical-practical classes typical exercises are solved.

The main objective of this unit is to understand the fundamental tools for the vibration analysis of components and structures. This course contributes primarily to the acquisition of the following specific competence for students: learn and know to apply the dynamic analysis of mechanisms and the techniques for detecting faults in equipment’s, as well as plan and implement industrial maintenance plans.

1. Introduction: elements of a vibratory system; free and forced vibration; damped and undamped vibration systems; types of damping; harmonic movement; procedure in vibration analysis. 2. Discrete systems with single degree of freedom: free or natural vibration; natural frequency of vibration; undamped vibration; damped vibration; under damping, over damping and critical damping vibration; logarithmic decrement; resonance; forced vibration; response to harmonic loads; response to periodic loads; vibration isolation and transmissibility; force transmitted to a rigid foundation; force transmitted to an elastic support; relative motion. 3. Discrete systems with multi degree of freedom: matrix formulation; the theorem of expansion; decoupling of the equations; modal analysis. 4. Experimental vibration analysis: transducers; forcing systems; signal analysis; dynamic tests of machines and structures; balancing of rotating parts; critical speed of shafts; isolation of vibrations.

Exam Evaluation.

The evaluation of this curricular unit is performed through a written exam at the end of the semester. This exam consists of two parts, a theoretical component and a theoretical-practical one, corresponding each to 40% and 60% of the final grade, respectively. It is required to obtain a minimum of 30% in the theoretical component.

NAO