Koichi Morikawa

Micro Cilium Actuators in Group

Aiming to realize novel micro mobile robots or micro conveyers, artificial micro cilium actuators in group should be developed. A pipemorph actuator which is composed of a thin needle as an internal electrode, piezoelectric thin film cylindrically surrounding the internal electrode, and external electrodes attached on the orthogonal four surfaces of the piezoelectric film is adopted as an artificial cilium and then the effective processes based on the hydrothermal method the and electrostatic flocking to fabricate the micro pipemorph actuators in group are proposed and experimentally examined. The cilium actuators in group which are fabricated by using partial nickel plating of titanium wire can convey small paper sheets or plastic sheets at the maximum speed of 1.53 µm/min.

The Estimation of the Sound Power Radiating from a Peripherally Fixed Rectangular Plate Subjected to Acoustic Excitation (2nd Report, Estimation and Experiment in Case the Plate is Excited in Diffused Sound Field)

This paper describes the estimation method of the sound power radiating from a four side fixed rectangular plate acoustically excited in a diffused sound field. First, the forced vibration of the plate excited by a plane wave in a free sound field has been solved. In the calculation, the distribution of the plane angles of modal exciting forces is taken into consideration precisely. Next, the stochastic model composed of random plane wave elements is assumed on the diffused sound field. The modal exciting forces and the forced vibration displacement are derived based on the ergodic process. Using the obtained forces and displacement, the equations for calculating the frequency spectra of the parameters for estimation are derived. The estimated frequency responses of radiating sound power coincided well with the measured values.