|
|
|
Engineering Mechanics Corporation of Columbus
|
|
|
 
 
|
|
|
 Research Engineer E-mail: tzhang@emc-sq.com 614-459-3200 ext 234 |
|
|
Education Ph.D., Mechanical Engineering, University of Iowa, Iowa City, Iowa M.S., Naval Architecture and Ocean Engineering, Shanghai Jiao Tong University, Shanghai B.S., Metal Forming, Shenyang Institute of Technology, Shenyang Areas of Expertise Numerical simulation in engineering fracture mechanics, electronic packaging, naval architectures, and material processing; design optimization methods with/without derivatives; development of accurate response surface function; meshless method; structural reliability analysis. Technical Qualifications Development of a new optimization method: Dr. Zhang has developed a new response surface model and a systematic method of basis selection. The generalized bases include conventional polynomial bases and radial basis function. A new hybrid optimization method is developed by integrating proposed new response surface model and pattern search. The method can be applied in both of derivative or derivative-free cases. The method is highly desirable for multi-disciplinary designs, and large nonlinear engineering structures, in which response sensitivities typically are either very difficult or even impossible to obtain. Numerical investigation shows the method not only provides accurate solutions but also is computationally efficient in mathematical and structural problems. Analysis and design optimization of electronic packaging: Dr. Zhang has developed a new three-step approach to analyze electronic packaging systems in an efficient and accurate way. The methodology involves (1) global deformation simulation; (2) equivalent model iteration; (3) high-fidelity local analysis. The simulation-based methodology is validated using experiments conducted by Rockwell Collins in Iowa and Rockwell Scientific Company in California. The thermal fatigue life (including crack initiation and crack propagation) matches with the experimental data. Dr. Zhang also developed a two-stage (global/local) approach to optimize the durability of the electronic packaging system, in which derivatives can not be obtained. The optimum material properties (PCB and package) and solder shape will be provided as engineering design reference at Rockwell Collins. Strength and vibration analysis of naval architectures: Dr. Zhang has developed an efficient method to simulate the impact collapse of plate-beam structure of ship hull and an FEM software is developed. He has been involved in the vibration analysis of the superstructure and fluid dynamics analysis of ship hull by the commercial software SESAM imported from Norway. Metal forming analysis: Dr. Zhang has experience in simulating the plastic deformation of upsetting based on the dislocation theory in metal at high temperature. He also worked on the die design and various material processing technologies when he was an assistant professor at University of Aeronautics and Astronautics in China. Finite element programming: Dr. Zhang has extensive experience on finite element programming. He developed special finite element codes for impact collapse of ship hull under collision forces. He also has experience in using commercial FEA software such as ABAQUS, ANSYS, SESAM and DEFORM. Professional Affiliations American Society of Mechanical Engineers |
|
|
© 2008 Engineering Mechanics Corporation of Columbus, All Rights Reserved. |
|