Inverse time overcurrent relay.

Tuzuner, Sevinc


Inverse dynamics control of parallel manipulators around singular configurations
Özdemir, Mustafa; İder, S. Kemal; Department of Mechanical Engineering (2008)
In this thesis, a technique for the motion of parallel manipulators through drive singularities is investigated. To remedy the problem of unbounded inverse dynamics solution in the neighborhood of drive singularities, an inverse dynamics controller which uses a conventional inverse dynamics control law outside the neighborhood of singularities and switches to the mode based on the formerly derived modified equations inside the neighborhood of singularities is proposed. As a result, good tracking performance...
Inverse dynamics control of flexible joint parallel manipulators
Korkmaz, Ozan; İder, Kemal; Department of Mechanical Engineering (2006)
The purpose of this thesis is to develop a position control method for parallel manipulators so that the end effector can follow a desired trajectory specified in the task space where joint flexibility that occurs at the actuated joints is also taken into consideration. At the beginning of the study, a flexible joint is modeled, and the equations of motion of the parallel manipulators are derived for both actuator variables and joint variables by using the Lagrange formulation under three assumptions regard...
Inverse design of compressor cascades
Kaplan, B.; Eyi, Sinan (2001-12-01)
In this paper an inverse design method is presented which couples a Navier-Stokes flow solver and a numerical optimization algorithm. The design method generates a compressor cascade, producing a specified surface pressure distribution at a transonic speed. A least-square optimization technique is used to minimize pressure discrepancies between the target and designed cascades. In order to represent the nonlinear, rotational and viscous physics of transonic flows, Navier-Stokes equations are used to predict...
Inverse dynamics of parallel manipulators in the presence of drive singularities
Ider, SK (Elsevier BV, 2005-01-01)
At drive singularities of parallel manipulators the actuators lose control of the end-effector in certain directions. It is shown that if certain conditions related to the consistency of the dynamic equations are satisfied by a proper design of the trajectory, the manipulator can pass through the singular positions while the actuator forces and the system motion remain stable. To find the values of the actuator forces in the neighborhood of the drive singularities, the dynamic equations are modified by usin...
Inverse design of compressor cascades on parallel computers
Özhamam, M.; Eyi, Sinan (2002-01-01)
In this paper, the performance improvements of an inverse compressor cascade design are investigated. A Navier-Stokes code is used for flow analysis. A least-square optimization method is used to minimize pressure discrepancies between initial and target cascades. In optimization process, most of the CPU time is associated with the sensitivity analyses. Sensitivities are evaluated on parallel computers by using a finite difference approach. Results show that, analyzing sensitivities on parallel computers re...
Citation Formats
S. Tuzuner, “Inverse time overcurrent relay.,” Middle East Technical University, 1965.