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Biography: Xingjian Jing received the B.S. degree from Zhejiang University, China, the M.S. degree and PhD degree in Robotics from Shenyang Institute of Automation, Chinese Academy of Sciences in 2001 and 2005, respectively. He also achieved the PhD degree in nonlinear systems and signal processing from University of Sheffield, U.K. in 2008.
He is now a Professor with the Department of Mechanical Engineering, City University of Hong Kong. Before joining in CityU, he was a Research Fellow with the Institute of Sound and Vibration Research, University of Southampton, followed by assistant professor and associate professor with Hong Kong Polytechnic University. His current research interests include: Nonlinear dynamics, Vibration, Control and Robotics, with a series of 200+ publications of 12800+ citations and H-index 59 (in Google Scholar), with a number of patents filed in China and US. He is one of the top 2% highly cited world scientists and a senior IEEE member.
Prof Jing is the recipient of a number of academic and professional awards including 2016 IEEE SMC Andrew P. Sage Best Transactions Paper Award, 2017 TechConnect World Innovation Award in US, 2017 EASD Senior Research Prize in Europe, 2017 the First Prize of HK Construction Industry Council Innovation Award, and 2019&2023 HKIE outstand paper awards etc.
He currently serves Associate Editors of Mechanical Systems and Signal Processing, IEEE Transactions on Industrial Electronics, & IEEE Transactions on Systems, Man, Cybernetics -Systems, and served as Technical Editor of IEEE/ASME Trans. on Mechatronics during 2015-2020. He was the lead editor of a special issue on “Exploring nonlinear benefits in engineering” published in Mechanical Systems and Signal Processing during 2017-2018 and is the lead editor of the other special issue on “Next-generation vibration control exploiting nonlinearities” published in MSSP during 2021-2022.

Tile of Speech: Beneficial Nonlinear Design in Engineering: The X-Structure/Mechanism Approach  

Abstract: Nonlinearity can take an important and critical role in engineering systems and thus cannot be simply ignored in structural design, dynamic response analysis, and parameter selection. A key issue is how to analyze and design potential nonlinearities introduced to or inherent in a system of under study, which is greatly demanded in many practical applications involving vibration control, energy harvesting, sensor systems and robots etc. This talk will present an up-to-date review on a cutting-edge method for manipulation and employment of nonlinearity in engineering systems developed in recent years, named as the X-structure or mechanism approach. The method is inspired from animal leg/limb skeletons and can provide passive low-cost high-efficiency adjustable and beneficial nonlinear stiffness (high static & ultra-low dynamic), nonlinear damping (dependent on resonant frequency and vibration excitation amplitude) and nonlinear inertia (low static & high dynamic) individually or simultaneously. The X-shaped structure or mechanism is a generic and considerably simple structure or mechanism representing a class of beneficial geometric nonlinearity with realizable and flexible linkage mechanism or structural design of different variants or forms (quadrilateral, diamond, polygon, K/Z/S/V-shape, or others) which all share similar geometric nonlinearity and thus similar nonlinear stiffness/damping properties, flexible in design and easy to implement. This talk systematically reviews the research background & motivation, essential bio-inspired ideas, advantages of this novel method, beneficial nonlinear properties in stiffness, damping and inertia, and potential applications, and ends with some remarks and conclusions. 

Biography: Prof. Dr. Wan Azmi bin Wan Hamzah (W. H. Azmi) is currently a Professor in Mechanical Engineering at the Faculty of Mechanical & Automotive Engineering Technology, Universiti Malaysia Pahang Al-Sultan Abdullah (UMPSA). He received his B. Eng. in Mechanical Engineering from Universiti Teknologi Malaysia (UTM), M. Eng. and Doctor of Philosophy in Mechanical Engineering from Universiti Kebangsaan Malaysia (UKM) and Universiti Malaysia Pahang (UMP), respectively. His research interests are heat transfer, thermo-fluid engineering, automotive, nanotechnology, cooling systems, lubrication, air-conditioning systems, solar systems, tribology, and many more. He specialises in nanoparticle dispersion technology (Nano-Distec), which is mainly used in automotive systems. The research involved the invention of advanced automotive liquids using nanotechnology, namely Nanocoolants, Nanolubricants, and Nanopaints. His excellent research work has been published in over 100 high-impact journals. His works have over 8000 citations with an h-index of 52 in SCOPUS. He was awarded a remarkable total of 100 awards from national and international bodies for the research outcome.

Tile of Speech: Recent trends in sustainable development techniques: “Novel Nanolubricant for Air-Conditioning and Refrigeration Systems”  

Abstract: Nowadays, air-conditioning and refrigeration systems contribute to high energy demand and consumption worldwide. The endeavour toward efficient air-conditioning and refrigeration systems is vital in effectively utilising energy. One novel technique to encounter this issue is dispersing nanoparticles in the compressor’s lubricant, namely nanolubricant. Nanolubricant application in refrigeration systems can enhance the overall performance of the systems by improving the properties of their original base lubricants. The present talk aims to highlight the recent trends in sustainable development techniques by applying nanolubricants in air-conditioning and refrigeration systems. The nanolubricants were primarily prepared using two-step preparation. The stability of nanolubricants was evaluated by qualitative and quantitative methods. Next, the talk will examine the thermo-physical and tribological properties of nanolubricants, evaluate the performance of automotive and residential air-conditioning systems operated with mono and hybrid nanolubricants, and investigate the optimum condition of the system performance using nanolubricant. Stability evaluation showed that all nanolubricants have excellent stability attributes, with limited sedimentation observed. Dynamic viscosity and thermal conductivity of the mono and hybrid nanolubricants increased with volume concentration but decreased with temperature. Promising tribological results were obtained from nanolubricants, significantly reducing the coefficient of friction. Performance improvements were found for almost all tested samples when nanolubricants were applied in the system. Nanolubricants have contributed to the reduction of compressor work, cooling capacity enhancement, and power consumption in the system. In conclusion, nanolubricants can enhance lubricant properties and improve the overall system's performance when operating with green refrigerant. Nevertheless, a full-blown durability run of air-conditioning and refrigeration systems with nanolubricants is recommended for future work. The new generation of nanolubricant technology in air-conditioning and refrigeration systems with smaller components and higher efficiency is anticipated soon.