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RISComputing Natural Frequencies and Mode Shapes of an Axially Moving Nonuniform Beam
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The partial differential equation of motion of an axially moving beam with spatially varying geometric, mass, and material properties has been derived. Using the theory of linear time-varying systems and numerical optimization, ...
A New Approach to Compute Natural Frequencies and Mode Shapes of One-Dimensional Continuous Structures With Arbitrary Nonuniformities
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: One-dimensional continuous structures include longitudinal vibration of bars, torsional vibration of circular shafts, and transverse vibration of beams. Using the linear time-varying system theory, algorithms are developed ...
Minimum-Time Control of a Linear System With Input Saturation: A Practical Approach
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A simple algorithm is presented to find near-minimum-time control inputs for a controllable continuous-time linear time-invariant system with any number of states and inputs. The well-known digital deadbeat control algorithm ...
Optimal Damping of a Taut Cable Under Random Excitation
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper deals with the optimal damping of a taut cable when the excitation is random in nature. Both white noise and narrow band (NB) random excitations are considered. Effects of spatial correlations of random excitations ...
Optimal Damped Vibration Absorber: Including Multiple Modes and Excitation Due to Rotating Unbalance
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Optimal vibration absorbers are designed using the definition of Hinfinity norm and numerical optimization. The cases of both constant amplitude excitation and rotating unbalance excitation are considered. The design ...
Vibration Absorbers for a Mistuned Bladed Disk
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Mistuning refers to variations in modal properties of blades due to manufacturing tolerances and material defects. This can result in the amplification of a blade vibratory amplitude. This paper deals with the design of ...
Estimation of Forcing Functions on a Mistuned Bladed Rotor From Harmonic Response
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper deals with the estimation of forcing functions on a mistuned bladed rotor from measurements of harmonic response via Kalman filter (KF) in time domain. An unique feature of this approach is that the number of ...
Estimation of Forcing Function, Mistuning, and Modal Damping in a Bladed Rotor
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper deals with the estimation of forcing function, modal damping, and mistuned modal stiffnesses in a bladed rotor. Previous research on parameter estimation in a mistuned bladed rotor relies on the knowledge of the ...
Hydropower Plant Frequency Control Via Feedback Linearization and Sliding Mode Control
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents a new nonlinear controller design approach for a hydraulic power plant focusing on load frequency control aspect. It is based on input state feedback linearization and sliding mode/H∠control. Simulation ...
Hydropower Plant Load Frequency Control Via Second-Order Sliding Mode
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Super-twisting algorithm, a second-order sliding mode control method, is studied for hydropower plant frequency control. Two versions of this algorithm are introduced in this paper. Simulation results from both of these ...