2021 International Conference on Civil Engineering , Water Conservancy and Hydropower Engineering
Prof. Ji Wang



Prof. Ji Wang

Ningbo University, China


The Extended Rayleigh-Ritz Method for an Analysis of Nonlinear Vibrations


An extension has been made with the popular Rayleigh-Ritz method by integrating the energy functional over one period of vibration to eliminate the harmonics from the deformation function.  Then an eigenvalue problem is obtained for the frequency-amplitude dependence of nonlinear vibrations of small deformation.  This is the extension of Rayleigh-Ritz method of the energy formulation and Galerkin method with the inclusion of time, which is equivalent to the harmonics matching in nonlinear vibrations.  This proposed method has been validated by two examples of typical nonlinear vibration.  The extended Rayleigh-Ritz method can be utilized for the analysis of free and forced nonlinear vibrations of structures as a new technique with significant advantages. 

Research Area:

Wave propagation, vibration, acoustic wave, plate, beam, piezoelectric device

Research Experience:

Professor Ji Wang has been a Qianjiang Fellow Professor of Zhejiang Province at Ningbo University since 2002.  He also served as Associate Dean for Research and Graduate, School of Mechanical Engineering and Mechanics, Ningbo University, from 2013 to 2019.  Professor Ji Wang is the founding director of the Piezoelectric Device Laboratory, which is a designated Key Laboratory of City of Ningbo.  Professor Ji Wang was employed at SaRonix, Menlo Park, CA, as a senior engineer from 2001 to 2002; NetFront Communications, Sunnyvale, CA, as senior engineer and manager from 1999 to 2001; Epson Palo Alto Laboratory, Palo Alto, CA, as Senior Member of Technical Staff from 1995 to 1999.  Professor Ji Wang also held visiting positions at Chiba University, University of Nebraska-Lincoln, and Argonne National Laboratory.  He received his PhD and Master degrees from Princeton University in 1996 and 1993 and bachelor from Gansu University of Technology in 1983. 

Professor Wang has been working on acoustic waves and high frequency vibrations of elastic and piezoelectric solids for resonator design and analysis with several US and Chinese patents, over 120 journal papers, and frequent invited, keynote, and plenary presentations in major conferences around world.  He has been board members, advisors, and consultants to many leading companies in acoustic wave device industry.  Professor Wang has been a member of many international conference committees and currently serving the IEEE UFFC Technical Program Committees of the Frequency Control and Ultrasonics Symposia, the IEEE MTT-S, and the IEC TC-49.  He is also the funding chair of Committee on Mechanics of Electronic and Magnetic Devices, CSTAM, and the SPAWDA.  From 2015, Profess Wang is the editor-in-chief of Structural Longevity and members of the editorial boards of several international journals.