R. Brent Dixon 1 , Jack R. Edwards, Alex Sohn, Thomas A. Dow and David C. Muddiman, (1) Chemistry, W.M. Keck FT-ICR Mass Spectrometry Laboratory, North Carolina State University, 2620 Yarbrough Drive, Campus Box 8204, Raleigh, NC 27695, (2) Mechanical and Aerospace Engineering, North Carolina State University, Campus Box 7910, Broughton Hall 4223, Raleigh, NC 27695, (3) Precision Engineering C...

Kehan Tian,1,* William Arora,2 Satoshi Takahashi,2 John Hong,3 and George Barbastathis4 1IBM Semiconductor Research and Development Center, Hopewell Junction, New York 12533, USA 2Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA 3Qualcomm, 5775 Morehouse Drive, San Diego, California 92121, USA 4Singapore-MI...

Dr. D.-P. Song 1, C. Li 2, N. S. Colella 3, Prof. J. J. Watkins 6 Department of Polymer Science and Engineering, University of Massachusetts Amherst, 120 Governors Drive, Amherst, 01003, USA E-mail: [email protected] Prof. J.-H. Lee 5 Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, 160 Governors Drive, Amherst, MA 01003, USA Prof. X. Lu 4 School...

This chapter summarizes the performance of NEVEL during testing and competition. Attention is given to the design goals set forth in chapter 3. Numerous challenges encountered during testing are also discussed. The mechanical, sensor and navigation issues will be covered in order. 6.1 Mechanical Performance NEVEL's mechanical construction proved to be quite robust. The " T-Frame " was fabricate...

In this study, the authors proposed an electromagnetic harmonic movable tooth drive system. , The forced response equation of the drive system to exciting currents was developed. Using this equation, the forced responses of the drive system to exciting currents were investigated. The results show that the forced responses of the drive system to the exciting currents were affected by mechanical ...

A digitally controlled drive system was implemented in this study to control the speed and direction of a travelling-wave ultrasonic motor. The drive system, based on a 2-phase voltage-fed high-frequency serial-resonant inverter, uses the mechanical resonant frequency of an ultrasonic motor. A TMS320F243 digital signal processor was used to control an ultrasonic motor drive system. The speed co...

This chapter summarizes the performance of NEVEL during testing and competition. Attention is given to the design goals set forth in chapter 3. Numerous challenges encountered during testing are also discussed. The mechanical, sensor and navigation issues will be covered in order. 6.1 Mechanical Performance NEVEL's mechanical construction proved to be quite robust. The " T-Frame " was fabricate...

The bouncing gaits of terrestrial animals (hopping, running, trotting) can be modeled as a hybrid dynamic system, with spring-mass dynamics during stance and ballistic motion during the aerial phase. We used a simple hopping robot controlled by an artificial neural oscillator to test the ability of the neural oscillator to adaptively drive this hybrid dynamic system. The robot had a single join...

To produce a torque about a joint in the human body there must be sufficient drive to excite motor neurones in the spinal cord to discharge action potentials. The number of motor neurones that are recruited, and the rate at which those motor neurones discharge action potentials, is directly linked to the summation of twitch forces in the muscle. However, the potential to generate a torque also ...

We are working to understand Terfenol-D's behavior in dynamic applications. Experimental results demonstrate that the amplitudes of harmonics present in Terfenol-D transducer output displacement spectra increase with increasing drive-current amplitude. An empirical mathematical model which predicts harmonics is presented. The model approximates both the nonlinear strain versus magnetic flux den...