Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"harmonic balance"”.
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A harmonic balance framework for the numerical simulation of non-linear wave energy converter models in random seas
… time series from a given SDF. In particular, the harmonic random amplitude (HRA) approach can simulate the target statistical properties with perfect realism. In contrast, the harmonic deterministic amplitude (HDA) approach is statistically inconsistent (because the generated time-series are …
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Time-domain and harmonic balance turbulent Navier-Stokes analysis of wind turbine aerodynamics using a fully coupled low-speed preconditioned multigrid solver
… integration of the steady, time-domain and harmonic balance RANS equations coupled to the two-equation shear stress transport (SST) turbulence model. The design of the LSP implementation is such that each part of the code affected by LSP can be validated individually against the baseline …
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Aeroelastic Modeling of Blade Vibration and its Effect on the Trim and Optimal Performance of Helicopter Rotors using a Harmonic Balance Approach
… design variables such cyclic and higher</p><p>harmonic controls. A nite element model is introduced to model the structural</p><p>eects of the blade, and a coupled induced velocity/projected force model is used</p><p>to couple this structural model to the aerodynamic model constructed in …
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Spectral methods for circuit analysis
Harmonic balance (HB) methods are frequency-domain algorithms used for high accuracy computation of the periodic steady-state of circuits. Matrix-implicit Krylov-subspace techniques have made it possible for these methods to simulate large circuits more efficiently. However, the harmonic balance …
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Nonlinear Analysis and Control of Aeroelastic Systems
… the aeroelastic system. NNM dynamics along with harmonic balance method are used to generate analytical estimates of LCO amplitude and its sensitivities with respect to the introduced control parameters. A multiobjective optimization problem is solved to generate optimal control parameters which …
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Nonlinear Dynamics in Metamaterials under Elastic and Plastic Excitation and Spectral Submanifold Parameterization
… dissertation then presents the development of a harmonic balance method supplemented by spectral submanifolds for the analysis of nonlinear dynamical systems. As a generalization of nonlinear normal modes, spectral submanifolds parameterize nonlinear dynamical systems, effectively reducing the …
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Prediction of snap-through instability under harmonic excitation
A method is developed to predict the critical harmonic excitation of systems undergoing nonlinear oscillations. The method is based on the total energy approach which limits the system responses within a region bounded by a critical total energy in the phase space. Three one-degree-of-freedom …
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Using x-parameters for signal integrity applications
… treatments of the X-parameter formalism, the harmonic balance simulation method, the latency insertion method, and the Input/Output Buffer Information Specification (IBIS) are provided as background information along with some examples of how X-parameters are generated via simulation and …
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Development of a Multi-Body Nonlinear Model for a Seat-Occupant System
… response of the system when it is subjected to harmonic base excitation was studied using the incremental harmonic balance method. The incremental harmonic balance method was used to reduce the time required to generate the steady-state response of the system. The incremental
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NONLINEAR DYNAMICS OF CABLE GALLOPING VIA A TWO-DEGREE-OF-FREEDOM NONLINEAR OSCILLATOR
… flows are discussed from the generalized harmonic balance method. The analytical solutions for stable and unstable periodic motions in such a two degree-of-freedom system are achieved, and the corresponding stability and bifurcation was discussed. The limit cycle for the linear cable …
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The Spiritual Spa
… the desire to create a SPA that emanates perfect harmonic balance through architecture. What architectural solutions would synchronize the spiritual, mental, and physical elements of the SPA? The answers lie in the meaning of the term 'SPA'.SPA popularity has increased due to the population's …
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Performance improvement of a proof-mass actuator using nonlinear control
… is in danger of breaking its stroke limit. A harmonic balance analysis concludes that these nonlinear control laws do not induce limit cycles. The performance of actuators with different parameters is also compared. A relation is presented that associates the modal frequency of the structure …
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Análise não-linear e simulações de oscilações de sub-vão em linhas de transmissão
… cycles and, to determine their stability. A harmonic balance proved to be adequate for this investigation. Digital and analog simulation were tried to verify the mathematical predictions. The agreement in trends was confirmed.
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An investigation of flow-induced vibrations of a steam-generator tube
… for this autonomous system, the method of harmonic balance appears to be less suited than the two-point boundary-value algorithm for calculating periodic motions. For the case of a single-mode approximation. the results show that the tube undergoes relaxation oscillations and hence no …
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Identification of Thermoacoustic Dynamics Exhibiting Limit Cycle Behavior
… a similar nonlinear response is achieved. A harmonic balance technique that linearly incorporates the nonlinearity is developed which uses frequency entrainment to offer sufficient information for the identification. Its validity is assessed on a model, which is based on known dynamics of the …
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Nonlinear/electromagnetic co-simulation of microwaves and millimeter-waves links
… drive is treated by a modulation-oriented harmonic-balance method based on Krylov-subspace model-order reduction to allow the handling of large-size front ends. Different examples of links have been presented: an End-to-End link simulated by making use of an artificial neural network model; …
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Local and Global Stability and Dynamics of a Class of Nonlinear Time-Delayed One-Degree-of-Freedom Systems
… scheme, the normal forms, and the method of harmonic balance to calculate and trace small- and large-amplitude limit cycles and use Floquet theory to ascertain their stability and hence generate global bifurcation diagrams. We validate these diagrams using numerical simulations. We apply the …
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Small signal analysis of nonlinear systems with periodic operating trajectories
… even at high frequencies. It predicts the subharmonic oscillation that can occur in converters with constant-frequency current-mode control. It is implemented using the COSMIR program to solve for the state equations and for steady-state, making a general power supply simulation program.
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Sacrament of Deification: The Eucharistic Vision of Alexander Schmemann in Light of the Doctrine of Theosis
… and the Kingdom of God in an interdependent and harmonic balance. The study begins by tracing theosis to its roots in the doctrine of perichoresis, through the theology of creation, and the theological contributions of Theophilus of Antioch, St. Irenaeus of Lyons, St. Athanasius, St. Gregory of …
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Nonlinear transient and steady state analysis for self-excited single-phase synchronous reluctance generator
… reluctance generators (SPSERG). Their unbalanced loads make their analysis more difficult. This research is motivated by the fact that SPSERG provides a good alternative to single-phase induction generators used in stand-alone generation applications. A general methodology is suggested …
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