Conference Session

Modern Software Measurement Techniques

Collection

2006 Annual Conference & Exposition

Authors

Ruiqing Jia, China University of Mining and Technology; Shanjun Xu, China University of Mining and Technology; Songyun Gao, China University of Mining and Technology; El-Sayed Aziz, Stevens Institute of Technology; Sven Esche, Stevens Institute of Technology; Constantin Chassapis, Stevens Institute of Technology

Tagged Divisions

Instrumentation

, normal to the free stream flow. Performance characteristicsof airfoils are normally given in terms of the dimensionless lift coefficient and drag coefficient.For a specific angle of attack, α, the lift coefficient CL is a constant, even for different velocitiesV. Table 1 summarizes the relationships between the parameters that determine the lift forces of Page 11.141.7the airfoils. Table 1: Airfoil parameters No. Parameters Equations Notes 1 Lift coefficient C L = Lf (q 0 S) S: planform area of airfoil 2 Drag

Conference Session

Novel Measurement Experiments

Collection

2006 Annual Conference & Exposition

Authors

Henrik Åkesson, Blekinge Institute of Technology; Lars Hakansson, Blekinge Institute of Technology; Ingvar Gustavsson, Blekinge Institute of Technology; Ingvar Claesson, Blekinge Institute of Technology; Johan Zackrisson, Blekinge Institute of Technology; Thomas Lago, Acticut Inernational AB

Tagged Divisions

Instrumentation

) th e d riv in g fre q u e n c y f (2 ) f (1 ) f (3 ) f (4 ) F q  [H f ] f (5

Conference Session

Contemporary Instrumentation

Collection

2006 Annual Conference & Exposition

Authors

Mark Rajai, Northern Kentucky University; Hank Javan, University of Memphis; Seyed Allameh, Northern Kentucky University; Horold Wiebe, Northern Kentucky University

Tagged Divisions

Instrumentation

points. From these frequencies, Q of the resonance filter can be calculated as: Fr Q= F1 − F2 (3)Where Fr is the resonance frequency, and F1 and F2 are the 3db points respectively. The setupis shown in Fig. 3. . Fig.3 - Setup for Observing and Measuring Frequency Response and the BandwidthThe instrument discussed next is the curve tracer. With the advent of new IC-basedinstruments, the use of curve tracer is limited; however, some of its important circuit’s Page 11.471.5functions

Conference Session

Instrumentation and Measurements: Innovative Course Development

Collection

2006 Annual Conference & Exposition

Authors

David Beams, University of Texas-Tyler

Tagged Divisions

Instrumentation

frequencies (80 steps) and the high Q of the filter. Thegreatest discrepancy between expectations and results is the apparent discontinuity in phasemeasurement beyond 4.8kHz. This is a consequence of the switching from one quadraturenetwork to the next at 4750Hz. There is a small error in phase relationship of the two outputs ofthe third quadrature network, and the phase reading of TUNA II is the most sensitive to phaseerror of the quadrature network when the network phase is a multiple of ±90fl. (Under thesecircumstances, the error in the network phase reading is approximately equal to the phase errorof the quadrature network). Phase error in the quadrature network also produces an error in thereading of the network voltage gain. Computations show