School of Mathematical Sciences, Shenzhen University

Li Yuan Scholars Colloquium No. 137

Lecture Title: Retrieving Modes from Multicomponent Signals and Its Applications

Speaker: Prof. Qingtang Jiang (Zhejiang Normal University)

Date & Time: June 30, 2025, 7:00–8:00 PM

Venue: Room 303, Alumni Square, Yuehai Campus, Shenzhen University

Abstract: In this talk, we will introduce a chirplet transform-based method for retrieving modes from signals with crossover IFs. We will show how the chirplet transform, an extension of the continuous wavelet transform incorporating an additional chirp-rate variable, can effectively separate signals with IF crossovers. Furthermore, we will address a key challenge of this chirplet transform-based method: the slow decay along the chirp-rate direction. We will then present our recent work on overcoming this challenge by introducing a composition of the X-ray transform and the chirplet transform. Finally, we will discuss potential applications of the chirplet transform, including machinery vibration fault diagnosis and gait analysis.

Biography: Prof. Qingtang Jiang earned his PhD from Peking University and previously served as a lecturer and associate professor in the Department of Mathematics at the same institution. Before joining the University of Missouri–St. Louis (UMSL) in 2002, he conducted postdoctoral research at the National University of Singapore under the NSTB program and held visiting scholar positions at the University of Alberta (Canada) and West Virginia University (USA). From 2005 to 2024, he was a professor in the Department of Mathematics and Computer Science at UMSL. Currently, he is a Distinguished Professor at Zhejiang Normal University. He has co-authored one academic monograph and published more than 90 research papers.

All faculty and students are welcome!

Invited by: School of Mathematical Sciences

School of Mathematical Sciences

June 30, 2025