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Modal Control (modal + control)

Distribution by Scientific Domains
Engineering100%

Selected Abstracts

Probabilistic Approach for Nonlinear Modal Control of MDOF Structures Subjected to Multiple Excitations

COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING, Issue 1 2005
Kyung-Won Min
For the modal control of the MDOF structure, a new eigenvalue assignment algorithm that modifies the dynamic characteristics of only the specific mode is proposed. For the probabilistic evaluation of the proposed nonlinear modal control, the joint probability density function (PDF) of the equivalent nonlinearly controlled single-degree-of-freedom (SDOF) system is obtained by the solution of the reduced Fokker,Planck equation for the equivalent nonlinear system. To overcome the difficulty in the application of the joint PDF to the MDOF structure controlled by the hybrid mass damper (HMD) system and subjected to multiple excitations, the equivalent damping ratio is proposed. The results of the analysis indicate that the proposed nonlinear modal control strategy is effective for the control of MDOF structures requiring a significantly smaller peak control force than the linear quadratic Gaussian (LQG) controller to produce a similar control performance level. [source]

A surveillance of structural oscillations of industrial robots using optimal control at energy performance index

PROCEEDINGS IN APPLIED MATHEMATICS & MECHANICS, Issue 1 2009
Krzysztof J. Kali
Here is considered vibration of non-stationary carrying system of the IRb-6 robot. For a use of vibration surveillance an algorithm of modal control at energy performance index in the frequency domain has been applied. Purpose of the algorithm proposed is to minimise vibration amplitude of manipulating ends, and thus , to increase capacity of modern robot lines as well as, improve accuracy and repeatability of robot positioning. (© 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]