題目：Exploring the Rich Dynamics of Race Cars and Porpoising
時間：2025年4月28日 11:00-12:00
地點：機械與動力工程學(xué)院 F310會議室
邀請人：吳曉東 副教授、魯航宇 博士（智能汽車研究所）
Biography
Balázs Bauer is a PhD candidate in nonlinear dynamics at the Budapest University of Technology and Economics, specializing in global stability and dynamical integrity of mechanical systems. He holds a Bachelor's degree in Mechanical Engineering (specializing in development and mathematical modeling) and a Master's degree with highest honors in Mechanical Engineering and Modeling, where he focused on solid and fluid mechanical systems.
His research focuses on predicting and mitigating nonlinear instabilities in engineering applications, particularly where aeroelastic effects or high-dimensional dynamics challenge conventional stability analysis. A central theme of his work involves porpoising vibrations in Formula 1 vehicles—developing reduced-order models to capture complex fluid-structure interactions and designing nonlinear damping strategies to suppress hazardous oscillations. Additionally, he investigates friction-induced instabilities in impacting systems, uncovering how coupled friction-impact mechanisms amplify vibrations and lead to unexpected failures. By integrating analytical methods, numerical simulations, and experimental insights, his work advances the robustness of high-performance mechanical systems.
Abstract
In this seminar, we will investigate the complex aeroelastic phenomenon of porpoising - a coupled heave-pitch instability that has re-emerged as a critical challenge in modern Formula 1 design following the 2022 regulation changes. Using an innovative minimal-order model, we will analyze how this self-excited oscillation arises from the nonlinear aerodynamic forces generated by the Venturi effect, particularly examining the dynamic relationship between ride height and downforce while accounting for critical frictional impacts at the car floor-road interface. Our model captures the essential bifurcation behavior leading to instability while remaining computationally efficient for rapid analysis of global stability properties.
We will systematically evaluate stabilization approaches through the lens of nonlinear dynamics, first demonstrating why conventional solutions like tuned mass dampers prove ineffective without impractical mass penalties. The seminar will then focus on an advanced nonlinear mitigation strategy - specifically, a suspension system with piecewise nonlinear damping characteristics - that successfully suppresses porpoising while maintaining competitive performance. This passive solution offers significant advantages for real-world implementation, as it requires only moderate system modifications and leverages existing damper technology. Furthermore, we will explore how these stabilization methods interact with other dynamic modes of the vehicle, providing a comprehensive understanding of the global stability landscape in high-performance race cars.
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地址：上海市東川路800號上海交通大學(xué)閔行校區(qū)機械與動力工程學(xué)院
郵編：200240
Email：sjtume@sjtu.edu.cn