Sound Analysis of Disc Brake Systems using Wavelet-Ridges Method

Öz

In this work, the sounds from faulty disc brake system have been analyzed by wavelet ridge approach. The sounds have been acquired by two identical Norsonic Type 1228 microphones on vehicle in the lab environment. The data transferred into computer via data acquisition board was analyzed in Matlab by wavelet ridge approach to discriminate normal brake sound from the faulty one;  the entropy of wavelet ridge matrix have been calculated. All in all, it has been observed that the calculated entropies collected from the faulty brake is greater than the normal one, and it can be used as a discriminative feature in the fault analysis.

Anahtar Kelimeler

• Audio processing,Wavelet analysis,Disc brake system,Entropy

Disk Fren Sistemlerinde Dalgacık Tepeleri Yöntemi ile Ses Analizi

Öz

Bu çalışmada hatalı disk fren sistemlerinden gelen seslerin dalgacık tepeleri yaklaşımı ile analizi gerçekleştirilmiştir. Bu sesler iki adet Norsonic Type 1228 mikrofon ile laboratuvar ortamında ve araç üzerinde kaydedilmiştir. Bir veri toplama kartı aracılığı ile bilgisayara aktarılan ses kayıtları Matlab ile analiz edilmiş, normal fren sesleri ile istenmeyen sesleri ayırt etmek için Dalgacık Tepeleri yaklaşımı kullanılmıştır ve fren seslerinin dalgacık tepesi matrisleri için entropi değerleri bulunmuştur. İnceleme sonucunda hatalı frenlerden gelen sinyallerden hesaplanan entropilerinin daha yüksek olduğu ve bu değerlerin ayırıcı bir öznitelik olarak hata analizinde kullanılabileceği tespit edilmiştir.

Anahtar Kelimeler

• Ses işleme,Dalgacık analizi,Disk fren sistemi,Entropi

Kaynakça

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