Request Expert

In his research on structural dynamics, Expert employs the techniques of finite element analysis extensively. He regularly uses ANSYS, NASTRAN, Pro/Engineer, and SDRC Master Series in analyzing a variety of static, transient, thermal, and eigenvalue problems. Examples of his recent work include the design of components used in machine tools, photolithography stages, and CT scanners. Most of this work emphasizes the efficient use of material to reduce cost and manufacturing time while maximizing static and dynamic stiffness. Additional work has been done to predict the damping available from viscoelastically-damped structures.



Expert's government- and industry-sponsored work in regenerative chatter has led to new models in machine tools, including generalization of the classic orthogonal cutting model to other tool geometries. Exhaustive experimental investigation has been used to verify analytical models. His ongoing research is currently expanding the understanding of chatter in grinding, which has received much less attention from past research. At present, Expert is heavily involved with machine tool builders seeking to develop machine designs capable of heavy cutting and grinding without experiencing chatter. His recent projects include machining centers, cylindrical and centerless grinders, and wafer polishing machines.

Understanding that machine vibration arises from a variety of sources, Expert has studied rotating imbalance, high-speed actuation, pump vibration, and others. His experience in machine vibration also includes measuring and interpreting these vibrations. He has measured particular vibration characteristics with sensors such as accelerometers and capacitance gages. He has designed solutions such as damping treatments, structural reinforcement, and proper balancing.



Modal analysis is a power method of identifying the characteristics of a structure. The results of an analytical (FEA) or experimental modal analysis may be used to improve the dynamic characteristics of a structural design. Expert's experience with modal analysis has been primarily aimed at identifying the key dynamic characteristics of a particular structure and working towards improvement. Examples of his work include the redesign of machine tool structures with increased damping and stiffness, understanding the structural problems of the individual semiconductor process equipment, and measuring the characteristics of different prototypes to create a better final design.


Modal analysis is a power method of identifying the characteristics of a structure. The results of an analytical (FEA) or experimental modal analysis may be used to improve the dynamic characteristics of a structural design. Expert's experience with modal analysis has been primarily aimed at identifying the key dynamic characteristics of a particular structure and working towards improvement. Examples of his work include the redesign of machine tool structures with increased damping and stiffness, understanding the structural problems of the individual semiconductor process equipment, and measuring the characteristics of different prototypes to create a better final design.


Expert's consulting experience involves dozens of companies in the semiconductor and machine tool industries. Most of his engagements lead to the solution of a vibration-related problem or a structural dynamics issue. The solutions have led to numerous designs that are now in production. A typical scenario involves collecting vibration data followed by analyzing the problem and designing a solution in cooperation with the machine's builder.