Research talk by Prof. Ming-Chyuan Lu from the Department of Mechanical Engineering, National Chung Hsing University (NCHU), Taiwan
Venue:
ME Auditorium
January 21, 2025
Research talk by Prof. Ming-Chyuan Lu from the Department of Mechanical Engineering, National Chung Hsing University (NCHU), Taiwan.
Title: Applying Audible Sound to Condition Monitoring in Laser Welding and DED Additive Manufacturing
Venue and Time: ME Auditorium, 3 PM, Tuesday 21 Jan 2025
Abstract: Condition monitoring is one of the key tasks in enhancing product quality and improving manufacturing process efficiency. In this presentation, some key issues that limit the capability of directly transferring the system developed in the laboratory to the mass production line in industry will be discussed first. Secondly, the development of sound-
based quality monitoring will be presented. The microphone array was also developed to reduce the noise influence on the developed monitoring and increase the system's robustness. Finally, research in NCHU for applying sound signals to detect balling defects in DED metal additive manufacturing will be discussed. The mechanism of balling defect in the DED process is introduced, and the relation between balling generation and the sound signal is demonstrated. In the development of a sound-based monitoring system, a microphone array was developed to analyze and compensate the sound signals for in-plane free-path deposition to remove the variation of the amplitude of sound signal caused by changing the deposition orientation
based quality monitoring will be presented. The microphone array was also developed to reduce the noise influence on the developed monitoring and increase the system's robustness. Finally, research in NCHU for applying sound signals to detect balling defects in DED metal additive manufacturing will be discussed. The mechanism of balling defect in the DED process is introduced, and the relation between balling generation and the sound signal is demonstrated. In the development of a sound-based monitoring system, a microphone array was developed to analyze and compensate the sound signals for in-plane free-path deposition to remove the variation of the amplitude of sound signal caused by changing the deposition orientation
Bio: Dr. Ming-Chyuan Lu is a professor at the Department of Mechanical Engineering, National Chung Hsing University, Taiwan. His current research interests focus on condition monitoring in laser welding, metal additive manufacturing, and micromachining.
Dr. Lu received his B.S. degree in Mechanical Engineering from the National Cheng Kung University, Taiwan, in 1991, his M.S. degree in Power Mechanical Engineering from the National Tsing Hua University, Taiwan, in 1993, and a Ph.D. degree in Mechanical Engineering from the University of Michigan at Ann Arbor, USA, in 2001. Before pursuing his Ph.D. at the University of Michigan at Ann Arbor, Dr. Lu was an associate engineer at Opto-Electronics and System lab. of ITRI in Hsinchu, Taiwan, from 1993 to 1996 for the inkjet printer system design. During his Ph.D. study at Ann Arbor, Dr. Lu joined the ERC/RMS center at the University of Michigan focusing on the research regarding multi-sensor applications for tool condition monitoring.
Before joining NCHU as an assistant professor in 2006, Dr. Lu joined Nano-Architect Research Corporation in Hsinchu, Taiwan, from 2001 to 2005 as a project manager/manager for the plasma equipment development, and then became a researcher at the Mechanical and System Lab. of ITRI in Taichung, Taiwan for the machine tool system development. Dr. Lu ever served as president of the International Institute for Micro Manufacturing (I2M2, 2022-2023). He is now a member of the Editorial Board for the International Journal of Precision Engineering and Manufacturing (IJPEM) and a member of the Board for the Taiwan Society of Abrasive Technology (TSAT).