1. Introduction to mechanical signals in the time and frequency domains and industrial maintenance. Classification of signals.
o Introduction to industrial maintenance and predictive maintenance.
o Recognize signal types: deterministic or random, in power or energy.
o Analyze a real experimental case of a periodic signal from a Fourier series representation.
o Synthesize a transient (non-periodic) mechanical signal using harmonic components.
o Engineering units for ¿one side¿ and ¿two sided¿ spectra, depending on the signal type.
o Interpret the response of a resonating mechanical system to both periodic and transient excitation in the time and frequency domains.
o Investigate the variability of the parameters or functions used to describe random signals.
o Introduction to programming with Matlab: signal processing
2. Linear systems: filtering, TDA, and spectral analysis.
o Describe continuous linear mechanical systems and show their responses to typical excitation signals.
o Explore the response of an accelerometer to a transient with noise. Compare the performance of two accelerometers and define criteria for choosing one.
o Advanced aspects of filtering. Linear phase filters. Application to the case of transient mechanical signals.
o Signal extraction capability using the TDA (time domain averaging) technique. o Explore how to eliminate harmonic interference using the TDA technique.
o Use the FFT (Fourier Transform Function) algorithm to analyze a spectrum with EU (engineering units).
o Investigate the existence of discretization errors and the effect of window filtering on a harmonic signal.
3. Sampling theory.
o See the relationships between ¿t, NFFT, and ¿f for DTF calculations via FFT.
o Demonstrate quantization error.
o Show the effect of associating the dynamic range of data acquisition with the measured signal.
o Anti-aliasing filters.
o Demonstrate the periodicity inherent in DFT.
o Model-based signal processing.
4. Applications to the diagnosis of rotating machines.
o Study the application of pre-filtering to a signal showing the impact pulses generated by a bearing failure.
o Analyze gear vibrations and compare theoretical frequencies with measured values.
o Analysis of the spectrum of signals from bearings and gears measured in mechanical structures.
o Proposals for a physical explanation of the measured vibration signal coming from a rotating machine.
