Vaughn College of Aeronautics and Technology

Effective attractive and repulsive interactions behind lift synchronization

Abstract Synchronization is a ubiquitous phenomenon in nonequilibrium systems. One intriguing example found in every-day life is lifts installed next to each other, that move closely and arrive almost simultaneously during a busy time. However, the basic mechanism behind this lif...

Predictive virtual sensor identification for nonlinear MPC: application to a 2-DoF flexible direct-drive robotic arm

Nonlinear Model Predictive Control (NMPC) is a powerful optimal control framework for nonlinear systems, offering high flexibility and performance. NMPC operates by solving an optimal control problem online at each time step, which requires predictive models capable of predicting...

Sensitivity-Driven Adaptive Surrogate Modeling for Simulation and Optimization of Dynamical Systems

Abstract. This paper develops a surrogate model refinement approach for the simulation of dynamical systems and the solution of optimization problems governed by dynamical systems in which surrogates replace expensive-to-compute state- and control-dependent component functions in...

From informal hawkers to state employees: newspaper vendors’ labor incorporation and identity reconstruction in Shanghai, 1911–1956

This article examines the transformation of Shanghai’s newspaper vendors from marginalized hawkers to state workers between 1911 and 1956. Vendors operated in a guild-based, hierarchical system dominated by powerful wholesalers, functioning largely beyond state control through in...

To stall-cell or not to stall-cell: Variational data assimilation of 3D mean flow past a stalled airfoil

The full-field reconstruction of three-dimensional (3D) turbulent flows from sparse experimental measurements remains a significant challenge, particularly for flows exhibiting complex 3D flow separation. In this work, we address this challenge for the case of stall cells - spanw...