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Dynamics and Dynamical Systems Commons™
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Articles 1 - 6 of 6
Full-Text Articles in Dynamics and Dynamical Systems
Swing-Up And Balancing Nonlinear Control For A Rotational Inverted Pendulum, Jiang Wang
Swing-Up And Balancing Nonlinear Control For A Rotational Inverted Pendulum, Jiang Wang
Mechanical & Aerospace Engineering Theses & Dissertations
In this thesis, nonlinear controllers are designed for the swing-up and balance modes of a rotational inverted pendulum, which is a pendulum hinged on a horizontally rotating link. The proposed control algorithms are designed by partial feedback linearization and sliding mode control techniques, for swing-up and balancing respectively. First a mathematical model of the pendulum dynamics is derived, followed by experimental verification. Then the system model is partially linearized, which makes it possible for the system to track a simple desired trajectory with "pump energy" function. Then a swing-up controller is designed. For an under-actuated mechanical system, like the inverted …
Stochastic Bifurcation In A Driven Laser System: Experiment And Theory, Lora Billings, Ira Schwartz, David Morgan, Erik Bollt, Riccardo Meucci, Enrico Allaria
Stochastic Bifurcation In A Driven Laser System: Experiment And Theory, Lora Billings, Ira Schwartz, David Morgan, Erik Bollt, Riccardo Meucci, Enrico Allaria
Department of Mathematics Faculty Scholarship and Creative Works
We analyze the effects of stochastic perturbations in a physical example occurring as a higher-dimensional dynamical system. The physical model is that of a class-B laser, which is perturbed stochastically with finite noise. The effect of the noise perturbations on the dynamics is shown to change the qualitative nature of the dynamics experimentally from a stochastic periodic attractor to one of chaoslike behavior, or noise-induced chaos. To analyze the qualitative change, we apply the technique of the stochastic Frobenius-Perron operator [L. Billings et al., Phys. Rev. Lett. 88, 234101 (2002)] to a model of the experimental system. Our main result …
Review Of The Product Development Process And Information Flow In The Manufacturing Industry: Problems And A Possible Wav Forward, E Opiyo
Tanzania Journal of Engineering and Technology (TJET)
No abstract provided.
Modeling, Optimization, And Flow Visualization Of Chemical Etching Process In Niobium Cavities, Sathish K. Subramanian
Modeling, Optimization, And Flow Visualization Of Chemical Etching Process In Niobium Cavities, Sathish K. Subramanian
UNLV Theses, Dissertations, Professional Papers, and Capstones
Niobium cavities are important component of the linear accelerators. Researchers have concluded that buffered chemical polishing on the inner surface of the cavity improves its performance. However the mechanism of chemical polishing is not well understood. A finite element computational fluid dynamics (CFD) model was developed to simulate the fluid flow characteristics of chemical etching process inside the cavity. The CFD model is then used to optimize the baffle design. The analysis confirmed the observation of other researchers that the iris section of the cavity received more etching than the equator regions. The baffle, which directs flow towards the walls …
Structural Design And Analysis Of A Rigidizable Space Shuttle Experiment, Raymond G. Holstein Iii
Structural Design And Analysis Of A Rigidizable Space Shuttle Experiment, Raymond G. Holstein Iii
Theses and Dissertations
AFIT is in the process of designing a Space Shuttle experiment designated as the Rigidized Inflatable Get-Away-Special Experiment (RIGEX) to study the effects of microgravity on the deployment of rigidizable composite structures. Once in space, the experiment will inflate and rigidize three composite structures and perform a vibration analysis on each by exciting the tubes using piezoelectric patches and collecting data via an accelerometer. This paper presents the structural and vibration analysis of the RIGEX assembly and inflatable composite tubes using ABAQUS Finite Element Analysis (FEA) software. Comparison of the analysis has been carried out with Eigenvalue/Eigenvector experimentation by means …
Vibrometric Detection Of Beam Damage Due To Inclusions, Aaron J. Reifsnyder
Vibrometric Detection Of Beam Damage Due To Inclusions, Aaron J. Reifsnyder
Theses and Dissertations
The Air Force Institute of Technology, in conjunction with the Structural Health Monitoring branch of the Air Force Research Laboratory, is researching methods of determining effects of notch location and size on beam structures using modal frequency analysis. This thesis explores the ability to detect included notches of varying magnitudes and locations within the frequency domain of an isotropic cantilever beam. A series of experiments employing centerline-notched 2024 T3 and 2024 0 aluminum beams was used to determine whether natural frequency measurement in beam structures is a valid mechanism for damage detection. Each specimen was excited by a strain actuator …