東京大学医科学研究所 附属病院 抗体・ワクチンセンター

Research


Nonlinear dynamics and control methods  in a variety of mechanical systems with the scale from nano to macro scales are theoretically and experimentally investigated in the Nonlinear Mechanical Systems Laboratory (NMSL). Mechanical systems inherently include more or less nonlinearity in the dynamics. The existence of many equilibrium points and the variety of their stability due to the nonlinearity can cause unexpected complex phenomena. Therefore, in order to ensure the safety and  reliability, the mechanical systems have been operated in a limited action range (for example, the range that sin θ can be approximated to be θ) and the requirement of high stiffness results in the increase of mass. Recently, as mechanical  systems  become  lighter, faster,  and more flexible, various  nonlinear phenomena can be easily produced. In NMSL, not only analysis and control of nonlinear phenomena but also positive utilization of nonlinear characteristics inherently existing in mechanical systems is one of the research topics to realize high-performance mechanical systems.  Research subjects include

(1) Nonlinear Control of micro-cantilever in AFM based on van der Pol oscillator,

(2) Energy Harvester by Parametric Resonance

(3) Mechanical Filter by Parametric Resonance

(4) High Viscosity Sensor

(5)Mass-sensor based on Weakly Coupled Modes under Self-Excited Oscillation

(6) Underactuated Manipulator

(7) High Speed Nonlinear Rotor Dynamics

(8) Stabilization Control of Hunting Motion in Railway vehicle Wheelset