Umezu S.,Okubo |
Tanabe N.,Kitakaname |
Key Engineering Materials | Year: 2015
Research on Micro air vehicle (MAV) has been carried out by many researchers to gather information in environmental monitoring, security and so on. When the earthquake, fire, smoke take place, it is difficult for human beings to investigate the detail because of dangerous condition. However, MAV has possibility to investigate the detail because MAV can fly freely around. Recently, dragonfly is highly focused by many researchers because dragonfly has high flight performances those are high efficiency flight, unintended acceleration, rapid turn and hovering. In general, these characteristics have root that wing is corrugation shape. We focus on microstructures on wing and its aerodynamic characteristics because there are many unique microstructures. We focused on micro spikes on dragonfly wing. Over three thousands of spikes exist on two sides of wing. The length and shape of spikes are 10 to 100 micron meters and oblique circular cone. It is important to clear the aerodynamic effect of the oblique circular cone. Artificial wing was fabricated by following processes. We fabricated micro spikes utilizing electro polishing. Fabricated micro spikes were set on plate utilizing micro spot bonding. We investigated the flow around the artificial wing and found that the flow around wing was controlled by micro spikes on wing. In this paper, we focused on comb shape of leading edge of wing. Comb shape is fabricated utilizing micro-EDM. We investigate flow characteristics of comb shape. © (2015) Trans Tech Publications.
Okubo | Date: 2013-06-05
A shower apparatus comprises a head, a base end portion, and a multi-spherical bendable j oint pipe disposed between the head and the base end portion, the pipe comprising a plurality of spherical joints provided consecutively. Each joint has a male or female spherical surface for rotationally fitting with adjacent joints each other. The spraying direction of shower water is freely changeable by adjusting the direction of the head through a flection of the multi-spherical bendable joint pipe. The shower apparatus allows a jet direction of shower water to be changed widely three-dimensionally compared with a conventional shower apparatus, and thus the present invention provides a user-friendly shower apparatus.