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RISS 인기검색어
- 검색키워드
- 저자 : Debbie Meyer (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Investigation of wind-induced dynamic and aeroelastic effects on variable message signs
Debbie Meyer,Arindam Gan Chowdhury,Peter Irwin 한국풍공학회 2015 Wind and Structures, An International Journal (WAS Vol.20 No.6
Tests were conducted at the Florida International University (FIU) Wall of Wind (WOW) to investigate the susceptibility of Variable Message Signs (VMS) to wind induced vibrations due to vortex shedding and galloping instability. Large scale VMS models were tested in turbulence representative of the high frequency end of the spectrum in a simulated suburban atmospheric boundary layer. Data was measured for the 0° and 45° horizontal wind approach directions and vertical attack angles ranging from -4.5° to +4.5°. Analysis of the power spectrum of the fluctuating lift indicated that vertical vortex oscillations could be significant for VMS with a large depth ratio attached to a structure with a low natural frequency. Analysis of the galloping test data indicated that VMS with large depth ratios, greater than about 0.5, and low natural frequency could also be subject to galloping instability.
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Investigation of wind-induced dynamic and aeroelastic effects on variable message signs
Meyer, Debbie,Chowdhury, Arindam Gan,Irwin, Peter Techno-Press 2015 Wind and Structures, An International Journal (WAS Vol.20 No.6
Tests were conducted at the Florida International University (FIU) Wall of Wind (WOW) to investigate the susceptibility of Variable Message Signs (VMS) to wind induced vibrations due to vortex shedding and galloping instability. Large scale VMS models were tested in turbulence representative of the high frequency end of the spectrum in a simulated suburban atmospheric boundary layer. Data was measured for the $0^{\circ}$ and $45^{\circ}$ horizontal wind approach directions and vertical attack angles ranging from $-4.5^{\circ}$ to $+4.5^{\circ}$. Analysis of the power spectrum of the fluctuating lift indicated that vertical vortex oscillations could be significant for VMS with a large depth ratio attached to a structure with a low natural frequency. Analysis of the galloping test data indicated that VMS with large depth ratios, greater than about 0.5, and low natural frequency could also be subject to galloping instability.
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Preservice Teachers’ Views of Culturally Diverse Students :A Case Study
Danielle Dani,Helen Meyer,Debbie Jackson 朝鮮大學校 師範大學 附設 敎科敎育硏究所 2010 敎科敎育硏究 Vol.31 No.2
This article reports on a research study that took place in a secondary science methods class and was designed to explore preservice science teachers’understanding of culturally diverse students. The framework for culturally relevant science was based on the constructs of critical science education laid out in Barton and Osborne’s (2001) introduction to Teaching science in diverse settings. The course was taught at an urban high school and involved high school students engaging in science inquiry activities with the preservice teachers followed by debriefings and instruction for the preservice teachers. Data were gathered about the preservice teachers’perceptions of culturally diverse students using a qualitative case study research design. Findings elaborate the preservice teachers’conceptions of urban students and perceptions of their roles as teachers. These views have the potential of informing science teacher preparation for culturally relevant science teaching.
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