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1

ARL-Wavelet-BPF optimization using PSO algorithm for bearing fault diagnosis

Ahsan Muhammad, Bismor Dariusz, Manzoor Muhammad Arslan

Archives of Control Sciences

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2023

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Vol. 33, No. 3

589--606

EN

Rotating element bearings are the backbone of every rotating machine. Vibration signals measured from these bearings are used to diagnose the health of the machine, but when the signal-to-noise ratio is low, it is challenging to diagnose the fault frequency. In this paper, a new method is proposed to enhance the signal-to-noise ratio by applying the Asymmetric Real Laplace wavelet Bandpass Filter (ARL-wavelet-BPF). The Gaussian function of the ARL-wavelet represents an excellent BPF with smooth edges which helps to minimize the ripple effects. The bandwidth and center frequency of the ARL-wavelet-BPF are optimized using the Particle Swarm Optimization (PSO) algorithm. Spectral kurtosis (SK) of the envelope spectrum is employed as a fitness function for the PSO algorithm which helps to track the periodic spikes generated by the fault frequency in the vibration signal. To validate the performance of the ARL-wavelet-BPF, different vibration signals with low signal-to-noise ratio are used and faults are diagnosed.

2

Design of a Dual-Band Rectangular Waveguide Filter based on Direct Coupled

Slimane Gouni, Mehdi Damou, Mohammed Chetioui, Abdelhakim Boudkhil

International Journal of Electronics and Telecommunications

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2022

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Vol. 68. No. 3

483--488

EN

This paper presents how to design and simulate a passband rectangular waveguide filters based on direct coupled resonators operating at 12 GHz. The modeled filters are characterized by a cross coupling that produces a single attenuation pole at finite frequency used to shape the bandpass response. Resonators provide bandpass filter designs with a pseudo-elliptic response using HFSS simulators. Transmission zeros are obtained through coupling between the fundamental mode and high mode. The filter structures are validated leading to obtain transmission zeros close to the passband. The simulated waveguide filters with a centre frequency exhibit an insertion loss of -0.4/0.3dB and a return loss of −20/23dB for a bandwidth ranging from 11.85GHz to 12.15GHz that shows good electromagnetic responses for the simulated filters.

3

Wykorzystanie technologii LTCC w projekcie filtra pasmowo-przepustowego do samochodowego radaru krótkiego zasięgu na pasmo 79GHz

Darek Mikołaj, Bajurko Paweł

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2019

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nr 6

429--432, CD

PL

W artykule opisano wykorzystanie technologii LTCC przy realizacji projektu filtra pasmowoprzepustowego na pasmo 79 GHz. Na podstawie wyników pomiarów zrealizowanego filtra zrewidowano założenia projektowe i opracowano udoskonalony projekt filtra wskazując przy tym korzystne praktyki projektowe.

EN

The article treats about the application of LTCC technology in development of a bandpass filter for the 79 GHz band. The design assumptions were revised on the basis of the fabricated filters measurement results, and an improved filter design was developed. Also profitable design practices are indicated in the paper.