In recent years, the introduction of new design and construction technologies, and the new developments in high-strength materials have lead to bridges and other large scale constructions with increased sizes and lower weights. Generally speaking, these large constructions have high levels of flexibility and long oscillation periods; consequently, further study is required into their wind stability, and particularly into the corresponding dynamic characteristics. While vigorous efforts are being made in research and development regarding wind stability, the role of the wind-tunnel is becoming evermore crucial. Accordingly, Komai Tekko Inc. has installed this wind-tunnel equipment in order to allow wind stability to be tested in a variety of different ways.
Wind Tunnel Performance
| Format |
Open-circuit wind
tunnel (i.e., Eiffel-type wind tunnel) |
| Testing type |
2D testing |
3D testing |
| Measurement area dimensions |
1.5 m (width) x 2.0 m (height) x 16 m (length) |
4.0 m (width) x 2.0 m (height) x 2.0 m (length) |
| Wind speed range |
0.5 to 25.0 m/s |
0.5 to 10.8 m/s |
| Wind speed deviation |
Within 1.0% |
Within 1.0% |
| Disturbance strength |
Within 0.5% |
Within 0.9% |
| Static pressure gradient |
0.9 %/m |
0.9 %/m |
Blower & Motor Performance
Blower
| Format |
Axial-flow, single stage |
Opening |
2.5-m diameter |
| Maximum output |
87 m3(for 3D testing)
75 m3(for 2D testing) |
| Total pressure |
80 mmAq |
| Drive type |
Belt |
Motor
| Format |
DC motor |
Output |
110kW |
| Voltage |
440V |
Speed |
0 to 1,475 rpm |
| Control |
Thyristor Leonard system |
Features
The width across the measurement section can be varied to enable both 2D testing and 3D testing, thus allowing the wind stability of constructions to be investigated from a wide range of directions.�
Size of measurement cross-section
1.5 m (w) x 2 m (h): For 2D testing
4 m (w) x 2 m (h): For 3D testing
- Featuring a long measurement channel (20-m), this equipment allows natural wind to be simulated through the creation of boundary-layer turbulent flow. Accordingly, the behavioral characteristics of large constructions can be investigated in three dimensions using wind which approximates that in the area of the construction site.
- A range of highly-accurate measurement devices and dedicated programs have been introduced to ensure that measurement and analysis can guarantee fast and accurate testing.
Example of Wind-Tunnel Testing
The following section provides an introduction to the type of wind-tunnel testing carried out here at Komai Tekko Incorporated.
> Wind Tunnel Facility
Wind Tunnel Facility
2-5-1 Nakajima, Nishi-Yodogawa Ward, Osaka City Telephone: 06-6475-2111
For any additional information regarding the content of this page, please contact the Technical Research Office.
E-Mail : inq@komaihaltec.co.jp
