Nonlinearity in macroscopic mechanical systems may lead to abundant phenomena for fundamental studies and potential applications. However, it is difficult to generate nonlinearity due to the fact that macroscopic mechanical systems follow Hooke's law and respond linearly to external force, unless strong drive is used. Here we propose and experimentally realize high cubic nonlinear response in a...

Mechanical models of a chain drive system are proposed and applied to the theoretical analysis of chain drive system of a certain type of heavy duty apron feeder in mobile crushing station, including a five-bar model discussing the speed fluctuation problems of the chain drive system, an elastic collision model probing the effects of impulsive loads and a model of meshing area revealing the str...

Positioning the read-write head in a hard disk drive over data bits at densities now approaching 1 terabit per square inch will novel servo configurations and controllers. This paper presents a MEMS microactuator for installation in a dual-stage servo system for a hard disk drive and controller designs that utilize the microactuator to suppress vibration of the servo arm. The microactuator uses...

In the TRIUMF cyclotron when a spark occurs it is necessary to shut off the RF drive and to initiate an RF restart procedure. It is also desirable to restore the full operational dee voltage as soon as possible in order to prevent thermal detuning of the resonant cavity. However, when the RF drive is shut off, the disappearance of Lorentz force on the resonator hot-arms causes the hot-arms to v...

It is important to recall that humanoid robot technology derives from the technology of industrial robots. It is obvious that the developments of bipedal robots such as the integration of robot-upper limbs to complex anthropomorphic structures have benefited from progress in mechanical structures, sensors and actuators used in industrial robot-arms. A direct link is sometimes made between the t...

Thermal noise is a limit to precision measurement in many fields. The relationship of the quality factor of mechanical systems to the thermal noise has compelled many researchers to search for materials with low mechanical losses. Typical measurements of mechanical quality factor involve exciting a mechanical resonator and observing the exponential decay of the amplitude under free oscillations...

Capacitive accelerometers with electrostatic force feedback are widely employed, because of performance and robustness. The force feedback acts as a means for electronic modulation of the spring constant of the suspension. Commonly, the electrostatic feedback is employed for null-based acceleration measurement. A suitable electrostatic time-varying actuation could instead be used to make the ac...

Experimental and Numerical Investigation of the Kinematic Theory of Unsteady Separation M. WELDON1, T. PEACOCK1, G. B. JACOBS2, M. HELU1, AND G. HALLER 1 Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Rm 1-310, Cambridge, MA 02139, USA [email protected] Department of Aerospace Engineering & Engineering Mechanics, San Diego State University, 5500 C...

1Department of Human and Information Systems, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan 2Mechanical Engineering, School of Engineering, University of North Florida, 1 UNF Drive, Jacksonville, FL 32224, USA 3Department of Mechanical Engineering, Sogang University, Mapoku, Seoul 121-742, Republic of Korea 4 Institut des Systèmes Intelligents et de Robotique, Univ...

The article was devoted to the study of an automated electric drive with a scalar closed-loop speed control system. Severe duty and operating modes determine actual service life. Wear induction motor, as key link drive, associated deviation from nominal parameters. parameters motor equivalent circuit determined resultant change characteristics. accuracy adjustment regulators optimal algorithms ...