Vehicle Engine Classification Using of Laser Vibrometry Feature Extraction

.......................................................................................................................................... 7 1 Introduction ............................................................................................................................... 8 2 – Laser Doppler Vibrometer Principle ....................................................................................... 11 3 – Data Collection Process .......................................................................................................... 13 4 – Previous Works ....................................................................................................................... 16 5 – Methodologies and Results for Tone-Pitch Index .................................................................. 19 5.1 – Tone-pitch vibration indexing scheme............................................................................. 19 5.2 – Supervised learning methods to classify vehicle engines using the tone-pitch index ..... 22 5.3 – Results for tone-pitch index ............................................................................................. 24 5.3.1 – Supervised learning ................................................................................................... 24 5.3.2 – Deep learning ............................................................................................................ 27 6 – Improving Tone-Pitch Index ................................................................................................... 28 6.1 – Number of hidden nodes and hidden layers ..................................................................... 28 6.2 – Inside the neural network ................................................................................................. 29 6.3 – Weakness in tone-pitch index .......................................................................................... 31 7 Methodologies and Results for Normalized Tone-Pitch Index ............................................... 33