Christopher Kim has successfully defended his doctoral dissertation, “Leveraging Impedance-Related Properties for Free Self-Sensing in Actuators for Compact Robots,” under the guidance of Cynthia Sung, Associate Professor in Mechanical Engineering and Applied Mechanics (MEAM).
Kim’s research explores innovative methods to integrate actuation and sensing by harnessing intrinsic impedance properties—namely electrical resistance, induced electromotive force (emf), and inductance. This approach eliminates the need for additional sensors in compact robotic systems. His work spans three primary applications:
- Resistance-Based Sensing: Utilizing I-cord knitted shape memory alloy actuators for real-time strain estimation.
- Emf-Based Sensing: Employing custom linear solenoid actuators to provide feedback on contact and velocity, demonstrated in systems such as bistable origami grippers and artificial facial muscle devices.
- Inductance-Based Sensing: Monitoring positions and flows in active valve systems that drive bidirectional underwater robots.
These innovations not only strengthen the theoretical and experimental foundations of robotics but also pave the way for advances in soft robotics, bio-inspired mechanisms, and medical implant devices.
Reflecting on his time at MEAM and Penn, Kim shared a heartfelt account of his growth as both an engineer and a researcher. He recalled key milestones such as getting his first paper accepted and presenting at conferences, but he emphasized that the everyday experiences were the most cherished—whether strolling along Locust Walk on his way to Towne or engaging in daily conversations with colleagues. “I’ve been incredibly fortunate to work alongside so many brilliant and inspiring people,” Kim says. “And I’ve learned something valuable from each of them.”
Looking ahead, Kim is setting his sights on the next chapter by exploring opportunities in industry, particularly in mechanical engineering and robotics. For aspiring PhD candidates, his advice is clear: a PhD at MEAM is an incredibly rewarding journey if you have a genuine passion for research. By aligning your work with what excites you most and understanding your long-term goals, you can make the most of this transformative experience.