Stephen Schein Email & Phone Number

El Segundo, California, United States

Greater Los Angeles Area

Research in the UCLA M'Closkey Lab has consisted of the modeling and optimization of MEMS resonator gyroscopes. The work up to this point consists of two primary contributions. The first contribution is a novel method to derive the resonator's empirical frequency responses by extracting a transient state space model through a Hankel (Ho-Kalman) based approach. This method has the advantage of removing feed-through capacitances in the resonator frequency responses that are seen in conventional models (S. Schein and R.T. M'Closkey, JMEMS, 2021). The second contribution is the use of this new empirical state space model to fit a second order mechanistic model that accurately predicts changes in resonator dynamics after a theta dependent mass and/or stiffness perturbation has been applied (Unpublished).

Ucla Engineering Iv/V

Research in the UCLA EPRL has consisted of work on an iterative process for shaping the temporal velocity profile of a gaseous jet in crossflow (JICF). Alternative temporal waveforms, typically measured via hotwire anemometry at the center of the nozzle exit, have been shown to affect JICF mixing characteristics. The most challenging velocity waveforms to create are those with rapid transitions in the jet velocity, e.g., single- and double-pulse square waveforms. Although linear models of the jet velocity actuation can be empirically determined, in practice for the JICF, they yield poor reproductions of the desired waveforms because the jet velocity is a highly nonlinear function of the actuation variable. This research has further improved waveform control by using the periodicity of the desired velocity deviation relative to the mean jet velocity. We empirically determine a local model relating perturbations of the harmonics in the input variable to jet velocity harmonics and provide a means to adjust the input harmonics so that the jet profile converges toward the desired signal. My work has also included making a new efficient scheme that enables rapid convergence of the iterative method under a variety of flow conditions.

As teacher's assistant, I hed recitation sections split between other TAs, held office hours once a week to help students with homework/exams, and conducted lab sections where the students could put their theory into practice.As lead teacher's assistant, I managed the course in a variety of other ways. I was in charge of constructing any new labs and/or any lab adjustments. I then met with the other teacher's assistants once a week to structure the following week's lab. I also generally met with the professor often to help bridge any present gap between the students and professor.

Grader and Tutor for Partial Differential Equations for Fall 2015; Grader for Dynamical Systems and Fourier Series and Boundary Value Problems courses for Spring 2016

Original research consisted of the derivation of a discrete, stochastic locust swarm model, implementation and parameter study of two-dimensional model in MATLAB, and comparison of simulation data with locust biology.

I graded for the Fluid Mechanics course for Fall 2015.

Blacksburg, Va

Work consisted of assisting with acoustic tests in Virginia Tech Wind Tunnel and Anechoic Chambers, creating finite element codes in MATLAB to assist in analyzing wind flow over terrain, and conducting experiments on microphones, analyzing the results in MATLAB to check microphone distortion.

Doctor Of Philosophy (Ph.D.), Mechanical Engineering (Controls)

Master Of Science - Ms, Mechanical Engineering

Bachelor’S Degree, Engineering, 2016

Bachelor’S Degree, Mathematics, 2016