Research subjects
Our laboratory aims to solve the problems related to noise and vibration in mechanical and structural systems bydeveloping theoretical and numerical analysis methods, active/passive control schemes. We also cover otherdynamics-related problems, such as the development of intelligent systems and energy harvesting systems.
Analysis of noise and vibration
Dynamic response analysis using FEM
We analyze dynamic behavior of mechanical systems using numerical computation methods such as the finite element method (FEM). The following figures represent the modal analysis examples of a motor stator and aninstrument,
Vibration and noise control
Passive vibration control systems
We develop vibration control devices, absorbers, and isolators, by the use of passive and functional materials, and also by utilizing nonlinear effects. The figure shows a damper whose damping effect attributes to the collision between a vibrator and a vibrating object.
Development of intelligent structural systems
We use smart materials such as MRE and MRF for the development of semi-active type intelligent control systems, haptic interface devices, soft sensors / actuators.
Active / passive noise control systems
We develop the active noise control system for cancelling noise within local space, the device to deflect propagating sound based on acoustic meta-materials.
Other dynamics-related topics
Collision anlaysis of system consisting of golf ball and club
Dynamic responses of collision systems: numerical modeling of a collision system, such as the system consisting of a golf ball and a club through the observation of impact behavior.
Mitigation of tremors in hands
Physiological tremor is a vibration that can be observed in human limbs. The tremor is an involuntary action caused by the contract and relax response of muscles, but it is usually insensible to humans themselves because the level of vibration is minor. Despite the smallness, the tremor affects precise works such as surgical operations. We develop an active-type wearable tremor mitigating device using sensors and actuators.
Development of energy harvesting systems
Use of piezoelectric materials and magnetostrictive materials forharvesting energy from various vibrating sources in the form of electricity.
