Charles Pezeshki

Washington State University

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Steve Elgar

Woods Hole Oceanographic Institution

Kelley Racicot

Washington State University

Earl H. Dowell

Duke University

Mohammad Alkhedher

Abu Dhabi University

Wyatt O. Davis

MicroVision (United States)

Marianne Mosher

Ames Research Center

Jeanne L. McHale

Washington State University

Fritz J. Knorr

Washington State University

Ram Krishna

National Institute of Technology Jamshedpur

Jacob Leachman

Washington State University

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Washington State University

University of Idaho

Indian Institute of Science Bangalore

Washington State University Spokane

University of Washington

Georgia Institute of Technology

National Academy of Engineering

Microsoft (United States)

North Carolina State University

University of California, Berkeley

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Influencing Performance Development in Student Design Groups through Relational Development

International journal of engineering education (2014)

Charles Pezeshki

In this paper, a review of a workshop directed by the author, as part of the 2012 Capstone Design Conference held at the University of Illinois, Urbana-Champaign, May 30-June 1, is presented. In the workshop, a theoretical approach that interprets how students form relationships, and how relational environments form student thinking, was presented that gives insight toward how to create high-performance teams in a very short time. The theory and reflection that were shared with workshop participants are based on the author's own experience with his clinic program, and the methods are based on the value-memetic theory known as Spiral Dynamics, originated by Clare Graves in the 1950s, and further developed by his student, Don Beck. During the workshop, the format of a capstone design clinic, measurably successful from an industrial recruitment and a project completion perspective, was presented, and the differences between the fundamental relational structure of this type of clinic, where independent, trust-based relationships are emphasized, vs. one with more traditional grading and policies, and instructor-assigned groups were contrasted. Following this, theory of relational development that all students were subjected to was discussed, and case studies from the workshop director's own program were distributed, highlighted and discussed.

Grading (engineering)

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Bispectral and trispectral characterization of transition to chaos in the Duffing oscillator

Faculty of Built Environment and Engineering (1993)

Vinod Chandran Steve Elgar Charles Pezeshki

Higher-order spectral (bispectral and trispectral) analyses of numerical solutions of the Duffing equation with a cubic stiffness are used to isolate the coupling between the triads and quartets, respectively, of nonlinearly interacting Fourier components of the system. The Duffing oscillator follows a period-doubling intermittency catastrophic route to chaos. For period-doubled limit cycles, higher-order spectra indicate that both quadratic and cubic nonlinear interactions are important to the dynamics. However, when the Duffing oscillator becomes chaotic, global behavior of the cubic nonlinearity becomes dominant and quadratic nonlinear interactions are weak, while cubic interactions remain strong. As the nonlinearity of the system is increased, the number of excited Fourier components increases, eventually leading to broad-band power spectra for chaos. The corresponding higher-order spectra indicate that although some individual nonlinear interactions weaken as nonlinearity increases, the number of nonlinearly interacting Fourier modes increases. Trispectra indicate that the cubic interactions gradually evolve from encompassing a few quartets of Fourier components for period-1 motion to encompassing many quartets for chaos. For chaos, all the components within the energetic part of the power spectrum are cubically (but not quadratically) coupled to each other.

Duffing equation

Intermittency

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Extracting and Characterizing Blade-Vortex Interaction Noise with Wavelets

Journal of the American Helicopter Society (1997)

Wyatt O. Davis Charles Pezeshki Marianne Mosher

Aircraft noise

10.4050/jahs.42.264

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Understanding Change and Development of Engineering Education in China

Zupeng Zhou Charles Pezeshki

Abstract Understanding Change and Development of Engineering Education in ChinaAbstract: In the fast development of China, the demand for engineers isincreasing rapidly in recent years. In this paper, the Chineseeducation system for training engineers has been studied in fourperspectives. First, the definition of qualified engineers in the Chineseeducation system is given. Second, how the Chinese educationsystem for engineers is supposed to operate to train the qualifiedengineers is illustrated as well. Third, the current practicaloperation situations of the Chinese education system for engineersare presented and the currently realized weaknesses or issues in thesystem are analyzed. Especially, the Education Department ofChina has already recognized the lack of practical engineeringtraining for the students both for the undergraduate and graduatelevels. Finally, the possible solutions for the known weaknessesduring the practical operation of the Chinese education system forengineers are pointed out. For instance, a nation-wide projectcalled Excellent Engineering Training Program (EETP) is beingcarrying out in many universities in China which have theengineering disciplines. According to EETP, 10 percent of theundergraduate students in these universities who major inengineering field will have the opportunity to join the EETP. In conclusion, by the analysis of the Chinese education systemfor engineers we can make the definition, the method of cultivation,the current problems, and the solutions to the current problems ofdeveloping qualified engineers in the Chinese education systemmore clear and it is going to be benefit to the future cultivation ofqualified engineers both in China and other countries.Key Words: Understanding; Change; Development; EngineeringEducation; China 1

10.18260/1-2--23221

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Citations (2)

Extracting Blade-Vortex Interaction Signals with Wavelet Analysis

AHS International Forum 51 (1995)

Wyatt O. Davis Charles Pezeshki Marianne Mosher

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Generation and analysis of Lyapunov exponents for the buckled beam

International Journal of Non-Linear Mechanics (1989)

Charles Pezeshki Earl H. Dowell

10.1016/0020-7462(89)90001-2

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Citations (28)

Auto and Cross-Bispectral Analysis of a System of Two Coupled Oscillators With Quadratic Nonlinearities Possessing Chaotic Motion

Journal of Applied Mechanics (1992)

Charles Pezeshki Steve Elgar Ram Krishna Thomas D. Burton

Auto and cross-bispectral analyses of a two-degree-of-freedom system with quadratic nonlinearities having two-to-one internal (autoparametric) resonance are presented. Following the work of Nayfeh (1987), the method of multiple scales is used to obtain a first-order uniform expansion yielding four first-order nonlinear ordinary differential equations governing the modulation of the amplitudes and phases of the two modes. The particular case of parametric resonance of the first mode considered in this paper admits Hopf bifurcations and a pure period doubling route to chaos. Auto bicoherence spectra isolate the phase coupling between increasing numbers of triads of Fourier components for a pure period doubling route to chaos for the individual degrees-of freedom. Cross-bicoherence spectra, on the other hand, yield information about the phase coupling between the two degrees-of-freedom. The results presented here confirm the capacity of bispectral techniques to identify a quadratically nonlinear mechanical system that possesses chaotic motions. For the chaotic case, cross-bicoherence spectra indicate that most of the nonlinear energy transfer between the modes is owing to cross-coupling between phase modulations rather than between amplitude modulations.

Bicoherence

10.1115/1.2893774

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An examination of multi-frequency excitation of the buckled beam

Journal of Sound and Vibration (1991)

Charles Pezeshki Steve Elgar Ram Krishna

Natural frequency

Duffing equation

10.1016/0022-460x(91)90817-4

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Citations (10)